init

diff --git a/.gitignore b/.gitignore
new file mode 100644 (file)
index 0000000..5f407ef
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+*
+!*/
+
+!.gitignore
+!*.c
+!*.h
+!*.py

diff --git a/__init__.py b/__init__.py
new file mode 100644 (file)
index 0000000..6639af1
--- /dev/null
+++ b/__init__.py
@@ -0,0 +1,1628 @@
+# Copyright (C) 2022 Harry Godden (hgn)
+
+bl_info = {
+   "name":"Convexer",
+   "author": "Harry Godden (hgn)",
+   "version": (0,1),
+   "blender":(3,1,0),
+   "location":"Export",
+   "descriptin":"",
+   "warning":"",
+   "wiki_url":"",
+   "category":"Import/Export",
+}
+
+print( "Convexer reload" )
+
+#from mathutils import *
+import bpy, gpu, math, os, time, mathutils
+from ctypes import *
+from gpu_extras.batch import batch_for_shader
+from bpy.app.handlers import persistent
+
+# Globals and tweaks
+vmt_param_dynamic_class = None
+
+# libcxr interface (TODO: We can probably automate this)
+# ======================================================
+libcxr = None
+libc_dlclose = None
+libc_dlclose = cdll.LoadLibrary(None).dlclose
+libc_dlclose.argtypes = [c_void_p]
+
+c_libcxr_log_callback = None
+c_libcxr_line_callback = None
+
+libcxr_decompose = None
+libcxr_context_reset = None
+libcxr_set_offset = None
+libcxr_set_scale_factor = None
+
+# Vdf writing interface
+libcxr_vdf_open = None
+libcxr_vdf_close = None
+libcxr_vdf_put = None
+libcxr_vdf_node = None
+libcxr_vdf_edon = None
+libcxr_vdf_kv = None
+
+# libnbvtf interface
+# ==================
+libnbvtf = None
+libnbvtf_convert = None
+
+# NBVTF constants
+# ===============
+
+NBVTF_IMAGE_FORMAT_RGBA8888 = 0
+NBVTF_IMAGE_FORMAT_RGB888 = 2
+NBVTF_IMAGE_FORMAT_DXT1 = 13
+NBVTF_IMAGE_FORMAT_DXT5 = 15
+NBVTF_TEXTUREFLAGS_CLAMPS = 0x00000004
+NBVTF_TEXTUREFLAGS_CLAMPT = 0x00000008
+NBVTF_TEXTUREFLAGS_NORMAL = 0x00000080
+NBVTF_TEXTUREFLAGS_NOMIP = 0x00000100
+NBVTF_TEXTUREFLAGS_NOLOD = 0x00000200
+
+# Wrapper for vdf functions to allow: with o = vdf_structure ...
+class vdf_structure():
+   def __init__(_,path):
+      _.path = path
+   def __enter__(_):
+      _.fp = libcxr_vdf_open( _.path.encode('utf-8') )
+      if _.fp == None:
+         print( F"Could not open file {_.path}" )
+         return None
+      return _
+   def __exit__(_,type,value,traceback):
+      if _.fp != None:
+         libcxr_vdf_close(_.fp)
+
+   def put(_,s):
+      libcxr_vdf_put(_.fp, s.encode('utf-8') )
+   def node(_,name):
+      libcxr_vdf_node(_.fp, name.encode('utf-8') )
+   def edon(_):
+      libcxr_vdf_edon(_.fp)
+   def kv(_,k,v):
+      libcxr_vdf_kv(_.fp, k.encode('utf-8'), v.encode('utf-8'))
+
+class cxr_object_context():
+   def __init__(_,scale,offset_z):
+      _.scale=scale
+      _.offset_z=offset_z
+
+libcxr_convert_mesh_to_vmf = None
+
+debug_gpu_lines = None
+debug_gpu_shader = gpu.shader.from_builtin('3D_SMOOTH_COLOR')
+debug_draw_handler = None
+
+class cxr_settings(Structure):
+   _fields_ = [("debug",c_int32),
+               ("lightmap_scale",c_int32),
+               ("light_scale",c_double)]
+
+class cxr_input_loop(Structure):
+   _fields_ = [("index",c_int32),
+               ("edge_index",c_int32),
+               ("uv",c_double * 2)]
+
+class cxr_polygon(Structure):
+   _fields_ =  [("loop_start",c_int32),
+                ("loop_total",c_int32),
+                ("normal",c_double * 3),
+                ("center",c_double * 3),
+                ("material_id",c_int32)]
+
+class cxr_edge(Structure):
+   _fields_ = [("i0",c_int32),
+               ("i1",c_int32)]
+
+class cxr_material(Structure):
+   _fields_ = [("res",c_int32 * 2),
+               ("vmt_path",c_char_p)]
+
+class cxr_input_mesh(Structure):
+   _fields_ = [("vertices",POINTER(c_double * 3)),
+               ("edges",POINTER(cxr_edge)),
+               ("loops",POINTER(cxr_input_loop)),
+               ("polys",POINTER(cxr_polygon)),
+               ("materials",POINTER(cxr_material)),
+
+               ("poly_count",c_int32),
+               ("vertex_count",c_int32),
+               ("edge_count",c_int32),
+               ("loop_count",c_int32),
+               ("material_count",c_int32)]
+
+class cxr_output_mesh(Structure):
+   _fields_ = []
+
+def libcxr_log_callback(logStr):
+   print( F"{logStr.decode('utf-8')}",end='' )
+
+debug_lines_positions = None
+debug_lines_colours = None
+
+def libcxr_reset_debug_lines():
+   global debug_lines_positions
+   global debug_lines_colours
+
+   debug_lines_positions = []
+   debug_lines_colours = []
+
+def libcxr_batch_debug_lines():
+   global debug_lines_positions
+   global debug_lines_colours
+   global debug_gpu_lines
+   global debug_gpu_shader
+
+   debug_gpu_lines = batch_for_shader(\
+      debug_gpu_shader, 'LINES',\
+      { "pos": debug_lines_positions, "color": debug_lines_colours })
+
+@persistent
+def cxr_on_load(dummy):
+   libcxr_reset_debug_lines()
+   libcxr_batch_debug_lines()
+
+@persistent
+def cxr_dgraph_update(scene,dgraph):
+   return
+   print( F"Hallo {time.time()}" )
+
+def libcxr_line_callback(p0,p1,colour):
+   global debug_lines_positions
+   global debug_lines_colours
+   debug_lines_positions += [(p0[0],p0[1],p0[2])]
+   debug_lines_positions += [(p1[0],p1[1],p1[2])]
+   debug_lines_colours += [(colour[0],colour[1],colour[2],colour[3])]
+   debug_lines_colours += [(colour[0],colour[1],colour[2],colour[3])]
+
+def cxr_draw():
+   global debug_gpu_lines
+   global debug_gpu_shader
+   
+   gpu.state.blend_set('ALPHA')
+   if debug_gpu_lines != None:
+      debug_gpu_lines.draw(debug_gpu_shader)
+
+class CXR_RELOAD(bpy.types.Operator):
+   bl_idname="convexer.reload"
+   bl_label="Reload convexer"
+
+   def execute(_,context):
+      global libcxr, libnbvtf, libnbvtf_convert
+
+      # Load vtf library
+      libnbvtf = cdll.LoadLibrary( os.path.dirname(__file__)+'/libnbvtf.so')
+      libnbvtf_convert = libnbvtf.nbvtf_convert
+      libnbvtf_convert.argtypes = [\
+        c_char_p, \
+        c_int32, \
+        c_int32, \
+        c_int32, \
+        c_int32, \
+        c_uint32, \
+        c_char_p ]
+      libnbvtf_convert.restype = c_int32
+
+      if libcxr != None:
+         _handle = libcxr._handle
+         
+         # TODO: Find a propper way to do this
+         for i in range(10): libc_dlclose( _handle )
+         del libcxr
+
+         libcxr = None
+      libcxr = cdll.LoadLibrary( os.path.dirname(__file__)+'/libcxr.so')
+      
+      build_time = c_char_p.in_dll(libcxr,'cxr_build_time')
+      print( F"libcxr build time: {build_time.value}" )
+   
+      # Public API
+      global libcxr_decompose
+      global libcxr_convert_mesh_to_vmf
+
+      libcxr_decompose = libcxr.cxr_decompose
+      libcxr_decompose.argtypes = [\
+         POINTER(cxr_input_mesh)
+      ]
+      libcxr_decompose.restype = c_int32
+
+      libcxr_convert_mesh_to_vmf = libcxr.cxr_convert_mesh_to_vmf
+      libcxr_convert_mesh_to_vmf.argtypes = [\
+         POINTER(cxr_input_mesh),\
+         c_void_p,\
+      ]
+      libcxr_convert_mesh_to_vmf.restype = c_int32
+      
+      global libcxr_context_reset, libcxr_set_offset,\
+             libcxr_set_scale_factor
+      libcxr_context_reset = libcxr.cxr_context_reset
+      
+      libcxr_set_offset = libcxr.cxr_set_offset
+      libcxr_set_offset.argtypes = [ c_double ]
+      
+      libcxr_set_scale_factor = libcxr.cxr_set_scale_factor
+      libcxr_set_scale_factor.argtypes = [ c_double ]
+
+      # VDF
+      global libcxr_vdf_open, \
+            libcxr_vdf_close, \
+            libcxr_vdf_put, \
+            libcxr_vdf_node, \
+            libcxr_vdf_edon, \
+            libcxr_vdf_kv
+      
+      libcxr_vdf_open = libcxr.cxr_vdf_open
+      libcxr_vdf_open.argtypes = [ c_char_p ]
+      libcxr_vdf_open.restype = c_void_p
+
+      libcxr_vdf_close = libcxr.cxr_vdf_close
+      libcxr_vdf_close.argtypes = [ c_void_p ]
+
+      libcxr_vdf_put = libcxr.cxr_vdf_put
+      libcxr_vdf_put.argtypes = [ c_void_p, c_char_p ]
+
+      libcxr_vdf_node = libcxr.cxr_vdf_node
+      libcxr_vdf_node.argtypes = [ c_void_p, c_char_p ]
+
+      libcxr_vdf_edon = libcxr.cxr_vdf_edon
+      libcxr_vdf_edon.argtypes = [ c_void_p ]
+
+      libcxr_vdf_kv = libcxr.cxr_vdf_kv
+      libcxr_vdf_kv.argtypes = [ c_void_p, c_char_p, c_char_p ]
+
+      # Callbacks
+      global c_libcxr_log_callback
+      global c_libcxr_line_callback
+
+      LOG_FUNCTION_TYPE = CFUNCTYPE(None,c_char_p)
+      c_libcxr_log_callback = LOG_FUNCTION_TYPE(libcxr_log_callback)
+      libcxr.cxr_set_log_function(cast(c_libcxr_log_callback,c_void_p))
+
+      LINE_FUNCTION_TYPE = CFUNCTYPE(None,\
+         POINTER(c_double),POINTER(c_double),POINTER(c_double))
+      c_libcxr_line_callback = LINE_FUNCTION_TYPE(libcxr_line_callback)
+      libcxr.cxr_set_line_function(cast(c_libcxr_line_callback,c_void_p))
+
+      return {'FINISHED'}
+
+def libcxr_use():
+   global libcxr
+
+   if libcxr == None:
+      bpy.ops.convexer.reload()
+   
+   def _bool_int(b):
+      return 1 if b else 0
+   
+   scene = bpy.context.scene
+   cxr = scene.cxr_data
+
+   settings=cxr_settings()
+   settings.debug=_bool_int(cxr.debug)
+
+   settings.lightmap_scale=cxr.lightmap_scale
+   settings.light_scale=cxr.light_scale
+
+   libcxr.cxr_settings_update(pointer(settings))
+
+def to_aeiou( v ):
+   ret = ""
+   if v == 0:
+      return "z"
+   dig = []
+   while v:
+      dig.append( int( v % 5 ) )
+      v //= 5
+   for d in dig[::-1]:
+      ret += [ 'a','e','i','o','u' ][d]
+   return ret
+
+def asset_uid(asset):
+   if isinstance(asset,str):
+      return asset
+   name = to_aeiou(asset.cxr_data.asset_id)
+   if bpy.context.scene.cxr_data.include_names:
+      name += asset.name.replace('.','_')
+   return name
+
+# -> <project_name>/<asset_name>
+def asset_name(asset):
+   return F"{bpy.context.scene.cxr_data.project_name}/{asset_uid(asset)}"
+
+# -> <subdir>/<project_name>/<asset_name>
+def asset_path(subdir, asset):
+   return F"{subdir}/{asset_name(asset_uid(asset))}"
+
+# -> <csgo>/<subdir>/<project_name>/<asset_name>
+def asset_full_path(sdir,asset):
+   return F"{bpy.context.scene.cxr_data.subdir}/"+\
+      F"{asset_path(sdir,asset_uid(asset))}"
+
+# view_layer.update() doesnt seem to work,
+# tag_redraw() seems to have broken
+#  therefore, change a property
+def scene_redraw():
+   ob = bpy.context.scene.objects[0]
+   ob.hide_render = ob.hide_render
+  
+   # the 'real' way to refresh the scene
+   #for area in bpy.context.window.screen.areas:
+   #   if area.type == 'view_3d':
+   #      area.tag_redraw()
+
+# The default shader is the first entry
+#
+cxr_shaders = {
+   "LightMappedGeneric":
+   { 
+      "name": "Light Mapped",
+      "id": 0
+   },
+   "VertexLitGeneric":
+   { 
+      "name": "Vertex Lit",
+      "id": 1
+   },
+   "UnlitGeneric":
+   { 
+      "name": "Unlit",
+      "id": 2
+   },
+   "Builtin":
+   {
+      "name": "Builtin",
+      "id": 3
+   }
+}
+
+def material_tex_image(v):
+   return {\
+      "ShaderNodeTexImage":
+      {
+         "image": F"${v}"
+      }
+   }
+
+cxr_graph_mapping = {
+   "ShaderNodeBsdfPrincipled":
+   {
+      "Base Color":
+      {
+         "ShaderNodeMixRGB":
+         {
+            "Color1": material_tex_image("$basetexture"),
+            "Color2": material_tex_image("$decaltexture")
+         },
+         "ShaderNodeTexImage":
+         {
+            "image":"$basetexture"
+         },
+         "default":
+            [("VertexLitGeneric","$color2"),\
+             ("UnlitGeneric","$color2"),\
+             ("LightMappedGeneric","$color")]
+      },
+      "Normal":
+      {
+         "ShaderNodeNormalMap":
+         {
+            "Color": material_tex_image("$bumpmap")
+         }
+      }
+   }
+}
+
+cxr_shader_params = {
+   "Textures":
+   {
+      "type": "ui",
+      "shaders": ("UnlitGeneric","VertexLitGeneric","LightMappedGeneric"),
+
+      "$basetexture":
+      {
+         "name": "Base Texture",
+         "type": "intrinsic",
+         "default": None
+      },
+      "$decaltexture":
+      {
+         "name": "Decal Texture",
+         "type": "intrinsic",
+         "default": None,
+
+         "$decalblendmode":
+         {
+            "name": "Blend Mode",
+            "type": "enum",
+            "items": [
+               ('0',"AlphaOver","Default",'',0),
+               ('1',"Multiply","",'',1),
+               ('2',"Modulate","",'',2),
+               ('3',"Additive","",'',3)
+            ],
+            "default": 0,
+            "always": True
+         }
+      },
+      "$bumpmap":
+      {
+         "name": "Normal Map",
+         "type": "intrinsic",
+         "flags": NBVTF_TEXTUREFLAGS_NORMAL,
+         "default": None
+      }
+   },
+   "$color":
+   {
+      "name": "Color",
+      "type": "intrinsic",
+      "default": None,
+      "exponent": 2.2
+   },
+   "$color2":
+   {
+      "name": "Color2",
+      "type": "intrinsic",
+      "default": None,
+      "exponent": 2.2
+   },
+   "Lighting":
+   {
+      "type": "ui",
+      "shaders": ("VertexLitGeneric", "LightMappedGeneric"),
+
+      "$phong":
+      {
+         "name": "Phong",
+         "type": "bool",
+         "default": False,
+
+         "$phongexponent":
+         {
+            "name": "Exponent",
+            "type": "float",
+            "default": 5.0
+         },
+         "$phongboost":
+         {
+            "name": "Boost",
+            "type": "float",
+            "default": 1.0
+         },
+         "$phongfresnelranges":
+         {
+            "name": "Fresnel Ranges",
+            "type": "vector",
+            "default":(1.0,1.0,1.0)
+         }
+      },
+      "$envmap":
+      {
+         "name": "Cubemap",
+         "type": "string",
+         "default": "",
+
+         "$envmaptint":
+         {
+            "name": "Tint",
+            "type": "vector",
+            "subtype": 'COLOR',
+            "default": (1.0,1.0,1.0)
+         },
+         "$envmaplightscale":
+         {
+            "name": "Light Scale",
+            "type": "float",
+            "default": 0.0
+         },
+         "$envmaplightscaleminmax":
+         {
+            "name": "Min/Max",
+            "type": "vector",
+            "default": (0.0,1.0)
+         }
+      }
+   },
+   "Transparency":
+   {
+      "type": "ui",
+      "shaders": ("UnlitGeneric","VertexLitGeneric","LightMappedGeneric"),
+
+      "$translucent":
+      {
+         "name": "Translucent",
+         "type": "bool",
+         "default": False
+      },
+      "$alphatest":
+      {
+         "name": "Alpha Test",
+         "type": "bool",
+         "default": False,
+
+         "$alphatestreference":
+         {
+            "name": "Step",
+            "type": "float",
+            "default": 0.5
+         }
+      },
+      "$nocull":
+      {
+         "name": "No Cull",
+         "type": "bool",
+         "default": False
+      }
+   }
+}
+
+def ent_get_origin(obj,context):
+   return obj.location * context.scale
+
+def ent_get_angles(obj,context):
+   euler = [ a*57.295779513 for a in obj.rotation_euler ]
+   angle = [0,0,0]
+   angle[0] = euler[1]
+   angle[1] = euler[2]
+   angle[2] = euler[0]
+   return angle
+
+def ent_baseclass(classes, other):
+   base = other.copy()
+   for x in classes:
+      base.update(x.copy())
+   return base
+
+ent_origin = { "origin": ent_get_origin }
+ent_angles = { "angles": ent_get_angles }
+ent_transform = ent_baseclass( [ent_origin], ent_angles )
+
+def ent_lights(obj,context):
+   kvs = ent_baseclass([ent_origin],\
+   {
+      "_distance": (0.0 if obj.data.cxr_data.realtime else -1.0),
+      "_light": [int(pow(obj.data.color[i],1.0/2.2)*255.0) for i in range(3)] + \
+                [int(obj.data.energy * bpy.context.scene.cxr_data.light_scale) ],
+      "_lightHDR": '-1 -1 -1 1',
+      "_lightscaleHDR": 1
+   })
+
+   if obj.data.type == 'SPOT':
+      kvs['_cone'] = obj.data.spot_size*(57.295779513/2.0)
+      kvs['_inner_cone'] = (1.0-obj.data.spot_blend)*kvs['_cone']
+      
+      # Blenders spotlights are -z forward
+      # Source is +x, however, it seems to use a completely different system.
+      # Since we dont care about roll for spotlights, we just take the
+      # pitch and yaw via trig
+
+      _,mtx_rot,_ = obj.matrix_world.decompose()
+      fwd = mtx_rot @ mathutils.Vector((0,0,-1))
+      
+      kvs['pitch'] = math.asin(fwd[2]) * 57.295779513
+      kvs['angles'] = [ 0.0, math.atan2(fwd[1],fwd[0]) * 57.295779513, 0.0 ]
+      kvs['_quadratic_attn'] = 0.0  # Source spotlights + quadratic falloff look awful.
+                                    # Blender's default has a much more 'accurate' look
+                                    # They appear correct when using linear scale.
+      kvs['_linear_attn'] = 1.0
+   
+   elif obj.data.type == 'POINT':
+      kvs['_quadratic_attn'] = 1.0
+      kvs['_linear_attn'] = 0.0
+   
+   elif obj.data.type == 'SUN':
+      pass # TODO
+
+   return kvs
+
+def ent_cubemap(obj,context):
+   return ent_baseclass([ent_origin],\
+      {"cubemapsize": obj.data.cxr_data.size})
+
+cxr_entities = {
+   "info_player_counterterrorist":
+   {
+      "gizmo": [],
+      "allow": ('EMPTY',),
+      "keyvalues": ent_baseclass([ent_transform],\
+      {
+         "priority": {"type": "int", "default": 0 },
+         "enabled": {"type": "int", "default": 1 },
+      })
+   },
+   "light": { "keyvalues": ent_lights },
+   "light_spot": { "keyvalues": ent_lights },
+   # SUN
+   "env_cubemap": { "keyvalues": ent_cubemap },
+
+   # Brush entites
+   "func_buyzone": 
+   {
+      "allow": ('MESH',),
+      "keyvalues": 
+      {
+         "TeamNum": {"type": "int", "default": 0 }
+      }
+   }
+}
+
+def cxr_intrinsic_classname(obj):
+   if obj.type == 'LIGHT':
+      return {
+         'SPOT': "light_spot",
+         'POINT': "light",
+         'SUN': "light_directional" }[ obj.data.type ]
+   
+   elif obj.type == 'LIGHT_PROBE':
+      return "env_cubemap"
+   elif obj.type == 'EMPTY':
+      if obj.is_instancer:
+         return "prop_static"
+   
+   return None
+
+def cxr_custom_class(obj):
+   if obj.type == 'MESH': custom_class = obj.cxr_data.brushclass
+   else: custom_class = obj.cxr_data.classname
+
+   return custom_class
+
+def cxr_classname(obj):
+   intr = cxr_intrinsic_classname(obj)
+   if intr != None: return intr
+   
+   custom_class = cxr_custom_class(obj)
+   if custom_class != 'NONE':
+      return custom_class
+
+   return None
+
+# Returns array of:
+#   intinsic:   (k, False, value)
+#   property:   (k, True,  value or default)
+#
+# Error: None
+#
+def cxr_entity_keyvalues(obj,context,classname):
+   if classname not in cxr_entities: return None
+
+   result = []
+
+   entdef = cxr_entities[classname]
+   kvs = entdef['keyvalues']
+
+   if callable(kvs): kvs = kvs(obj, context)
+
+   for k in kvs:
+      kv = kvs[k]
+      value = kv
+      isprop = False
+      
+      if isinstance(kv,dict):
+         isprop = True
+         value = obj[ F"cxrkv_{k}" ]
+      else:
+         if callable(kv):
+            value = kv(obj,context)
+
+      if isinstance(value,mathutils.Vector):
+         value = [_ for _ in value]
+
+      result += [(k, isprop, value)]
+
+   return result
+
+def material_info(mat):
+   info = {}
+   info['res'] = (512,512)
+   info['name'] = 'tools/toolsnodraw'
+
+   if mat == None or mat.use_nodes == False:
+      return info
+   
+   # Builtin shader
+   if mat.cxr_data.shader == 'Builtin':
+      info['name'] = mat.name
+      return info
+
+   if not hasattr(material_info,'references'):
+      material_info.references = set()
+
+   # Custom material
+   material_info.references.add(mat)
+   info['name'] = asset_name(mat)
+   
+   # Using the cxr_graph_mapping as a reference, go through the shader
+   # graph and gather all $props from it.
+   #
+   def _graph_read( node_def, node=None, depth=0 ):
+      nonlocal mat
+      nonlocal info
+      
+      def _variant_apply( val ):
+         nonlocal mat
+         
+         if isinstance( val, str ):
+            return val
+         else:
+            for shader_variant in val:
+               if shader_variant[0] == mat.cxr_data.shader:
+                  return shader_variant[1]
+      
+      # Find rootnodes
+      if node == None:
+         _graph_read.extracted = []
+
+         for node_idname in node_def:
+            for n in mat.node_tree.nodes:
+               if n.bl_idname == node_idname:
+                  node_def = node_def[node_idname]
+                  node = n
+                  break
+
+      for link in node_def:
+         if isinstance( node_def[link], dict ):
+            inputt = node.inputs[link]
+            inputt_def = node_def[link]
+
+            if inputt.is_linked:
+
+               # look for definitions for the connected node type
+               con = inputt.links[0].from_node
+               
+               for node_idname in inputt_def:
+                  if con.bl_idname == node_idname:
+                     con_def = inputt_def[ node_idname ]
+                     _graph_read( con_def, con, depth+1 )
+               
+               # No definition found! :(
+               #  TODO: Make a warning for this?
+
+            else:
+               if "default" in inputt_def:
+                  prop = _variant_apply( inputt_def['default'] )
+                  info[prop] = inputt.default_value
+         else:
+            prop = _variant_apply( node_def[link] )
+            info[prop] = getattr(node,link)
+
+   _graph_read(cxr_graph_mapping)
+   
+   if "$basetexture" in info:
+      export_res = info['$basetexture'].cxr_data.export_res
+      info['res'] = (export_res[0], export_res[1])
+
+   return info
+
+def mesh_cxr_format(obj):
+   dgraph = bpy.context.evaluated_depsgraph_get()
+   data = obj.evaluated_get(dgraph).data
+   
+   _,mtx_rot,_ = obj.matrix_world.decompose()
+
+   mesh = cxr_input_mesh()
+
+   vertex_data = ((c_double*3)*len(data.vertices))()
+   for i, vert in enumerate(data.vertices):
+      v = obj.matrix_world @ vert.co
+      vertex_data[i][0] = c_double(v[0])
+      vertex_data[i][1] = c_double(v[1])
+      vertex_data[i][2] = c_double(v[2])
+
+   loop_data = (cxr_input_loop*len(data.loops))()
+   polygon_data = (cxr_polygon*len(data.polygons))()
+
+   for i, poly in enumerate(data.polygons):
+      loop_start = poly.loop_start
+      loop_end = poly.loop_start + poly.loop_total
+      for loop_index in range(loop_start, loop_end):
+         loop = data.loops[loop_index]
+         loop_data[loop_index].index = loop.vertex_index
+         loop_data[loop_index].edge_index = loop.edge_index
+
+         if data.uv_layers:
+             uv = data.uv_layers.active.data[loop_index].uv
+             loop_data[loop_index].uv[0] = c_double(uv[0])
+             loop_data[loop_index].uv[1] = c_double(uv[1])
+         else:
+             loop_data[loop_index].uv[0] = c_double(0.0)
+             loop_data[loop_index].uv[1] = c_double(0.0)
+      center = obj.matrix_world @ poly.center
+      normal = mtx_rot @ poly.normal
+
+      polygon_data[i].loop_start = poly.loop_start
+      polygon_data[i].loop_total = poly.loop_total
+      polygon_data[i].normal[0] = normal[0]
+      polygon_data[i].normal[1] = normal[1]
+      polygon_data[i].normal[2] = normal[2]
+      polygon_data[i].center[0] = center[0]
+      polygon_data[i].center[1] = center[1]
+      polygon_data[i].center[2] = center[2]
+      polygon_data[i].material_id = poly.material_index
+
+   edge_data = (cxr_edge*len(data.edges))()
+
+   for i, edge in enumerate(data.edges):
+      edge_data[i].i0 = edge.vertices[0]
+      edge_data[i].i1 = edge.vertices[1]
+
+   material_data = (cxr_material*len(obj.material_slots))()
+
+   for i, ms in enumerate(obj.material_slots):
+      inf = material_info(ms.material)
+      material_data[i].res[0] = inf['res'][0]
+      material_data[i].res[1] = inf['res'][1]
+      material_data[i].vmt_path = inf['name'].encode('utf-8')
+   
+   mesh.edges = cast(edge_data, POINTER(cxr_edge))
+   mesh.vertices = cast(vertex_data, POINTER(c_double*3))
+   mesh.loops = cast(loop_data,POINTER(cxr_input_loop))
+   mesh.polys = cast(polygon_data, POINTER(cxr_polygon))
+   mesh.materials = cast(material_data, POINTER(cxr_material))
+   
+   mesh.poly_count =  len(data.polygons)
+   mesh.vertex_count = len(data.vertices)
+   mesh.edge_count =  len(data.edges)
+   mesh.loop_count =  len(data.loops)
+   mesh.material_count = len(obj.material_slots)
+
+   return mesh
+
+class CXR_WRITE_VMF(bpy.types.Operator):
+   bl_idname="convexer.write_vmf"
+   bl_label="Write VMF"
+
+   def execute(_,context):
+      libcxr_use()
+      libcxr_reset_debug_lines()
+      
+      # Setup output and state
+      filepath = bpy.data.filepath
+      directory = os.path.dirname(filepath)
+      settings = context.scene.cxr_data
+      
+      asset_dir = F"{directory}/bin"
+      material_dir = F"{settings.subdir}/materials/{settings.project_name}"
+      model_dir = F"{settings.subdir}/models/{settings.project_name}"
+
+      os.makedirs( asset_dir, exist_ok=True )
+      os.makedirs( material_dir, exist_ok=True )
+      os.makedirs( model_dir, exist_ok=True )
+      
+      # States
+      material_info.references = set()
+      libcxr_context_reset()
+      
+      output_vmf = F"{directory}/{settings.project_name}.vmf"
+
+      with vdf_structure(output_vmf) as m:
+         print( F"Write: {output_vmf}" )
+
+         m.node('versioninfo')
+         m.kv('editorversion','400')
+         m.kv('editorbuild','8456')
+         m.kv('mapversion','4')
+         m.kv('formatversion','100')
+         m.kv('prefab','0')
+         m.edon()
+
+         m.node('visgroups')
+         m.edon()
+
+         m.node('viewsettings')
+         m.kv('bSnapToGrid','1')
+         m.kv('bShowGrid','1')
+         m.kv('bShowLogicalGrid','0')
+         m.kv('nGridSpacing','64')
+         m.kv('bShow3DGrid','0')
+         m.edon()
+
+         m.node('world')
+         m.kv('id','1')
+         m.kv('mapversion','1')
+         m.kv('classname','worldspawn')
+         m.kv('skyname','sky_csgo_night02b')
+         m.kv('maxpropscreenwidth','-1')
+         m.kv('detailvbsp','detail.vbsp')
+         m.kv('detailmaterial','detail/detailsprites')
+         
+         # Make sure all of our asset types have a unique ID
+         def _uid_prepare(objtype):
+            used_ids = [0]
+            to_generate = []
+            id_max = 0
+            for o in objtype:
+               vs = o.cxr_data
+               if vs.asset_id in used_ids:
+                  to_generate+=[vs]
+               else:
+                  id_max = max(id_max,vs.asset_id)
+                  used_ids+=[vs.asset_id]
+            for vs in to_generate:
+               id_max += 1
+               vs.asset_id = id_max
+         
+         _uid_prepare(bpy.data.materials)
+         _uid_prepare(bpy.data.images)
+         _uid_prepare(bpy.data.collections)
+
+         # Export Brushes and displacement
+         def _collect(collection,transform):
+            if collection.name.startswith('.'):
+               return
+
+            if collection.name.startswith('mdl_'):
+               _collect.heros += [(collection,transform)]
+               return
+
+            for obj in collection.objects:
+               classname = cxr_classname( obj )
+
+               if classname != None:
+                  _collect.entities += [( obj,transform,classname )]
+               elif obj.type == 'MESH':
+                  _collect.geo += [(obj,transform)]
+
+            for c in collection.children:
+               _collect( c, transform )
+         
+         _collect.a_models = set()
+         _collect.entities = []
+         _collect.geo = []
+
+         transform_main = cxr_object_context( context.scene.cxr_data.scale_factor, 0.0 )
+         transform_sky = cxr_object_context( context.scene.cxr_data.skybox_scale_factor, \
+                                             context.scene.cxr_data.skybox_offset )
+         
+         if 'main' in bpy.data.collections:
+            _collect( bpy.data.collections['main'], transform_main )
+
+         if 'skybox' in bpy.data.collections:
+            _collect( bpy.data.collections['skybox'], transform_sky )
+         
+         # World geometry
+         for brush in _collect.geo:
+            baked = mesh_cxr_format( brush[0] )
+            libcxr_set_scale_factor( brush[1].scale )
+            libcxr_set_offset( brush[1].offset_z )
+            libcxr_convert_mesh_to_vmf(baked,m.fp)
+         
+         m.edon()
+         
+         # Entities
+         for entity in _collect.entities:
+            obj = entity[0]
+            ctx = entity[1]
+            cls = entity[2]
+            m.node( 'entity' )
+            m.kv( 'classname', cls )
+
+            kvs = cxr_entity_keyvalues( obj, ctx, cls )
+
+            for kv in kvs:
+               if isinstance(kv[2], list): 
+                  m.kv( kv[0], ' '.join([str(_) for _ in kv[2]]) )
+               else: m.kv( kv[0], str(kv[2]) )
+
+            if obj.type == 'MESH':
+               baked = mesh_cxr_format( obj )
+               libcxr_set_scale_factor( ctx.scale )
+               libcxr_set_offset( ctx.offset_z )
+               libcxr_convert_mesh_to_vmf(baked,m.fp)
+
+            m.edon()
+         
+      print( "[CONVEXER] Compile materials / textures" )
+
+      for mat in material_info.references:
+         compile_material(mat)
+
+      print( "[CONVEXER] Compiling models" )
+
+      libcxr_batch_debug_lines()
+      scene_redraw()
+
+      return {'FINISHED'}
+
+class CXR_DECOMPOSE_SOLID(bpy.types.Operator):
+   bl_idname="convexer.decompose_solid"
+   bl_label="Decompose Solid"
+
+   def execute(_,context):
+      libcxr_use()
+
+      # Prepare input data
+      mesh_src = mesh_cxr_format(context.active_object)
+      
+      libcxr_reset_debug_lines()
+      libcxr_decompose( pointer(mesh_src) )
+      libcxr_batch_debug_lines()
+         
+      scene_redraw()
+      return {'FINISHED'}
+
+class CXR_INTERFACE(bpy.types.Panel):
+   bl_label="Convexer"
+   bl_idname="SCENE_PT_convexer"
+   bl_space_type='PROPERTIES'
+   bl_region_type='WINDOW'
+   bl_context="scene"
+
+   def draw(_,context):
+      _.layout.operator("convexer.reload")
+      _.layout.operator("convexer.decompose_solid")
+      _.layout.operator("convexer.write_vmf")
+
+      settings = context.scene.cxr_data
+
+      _.layout.prop(settings, "debug")
+      _.layout.prop(settings, "scale_factor")
+      _.layout.prop(settings, "lightmap_scale")
+      _.layout.prop(settings, "light_scale" )
+      
+      box = _.layout.box()
+
+      box.prop(settings, "project_name")
+      box.prop(settings, "subdir")
+
+      box = _.layout.box()
+      box.operator("convexer.detect_compilers")
+      box.prop(settings, "exe_studiomdl")
+      box.prop(settings, "exe_vbsp")
+      box.prop(settings, "exe_vvis")
+      box.prop(settings, "exe_vrad")
+
+# COmpile image using NBVTF and hash it
+def compile_image(img,flags):
+   if img==None:
+      return None
+
+   name = asset_name(img)
+   src_path = bpy.path.abspath(img.filepath)
+
+   dims = img.cxr_data.export_res
+   fmt = { 
+      'RGBA': NBVTF_IMAGE_FORMAT_RGBA8888,
+      'DXT1': NBVTF_IMAGE_FORMAT_DXT1,
+      'DXT5': NBVTF_IMAGE_FORMAT_DXT5,
+      'RGB': NBVTF_IMAGE_FORMAT_RGB888
+   }[ img.cxr_data.fmt ]
+
+   mipmap = img.cxr_data.mipmap
+   lod = img.cxr_data.lod
+   clamp = img.cxr_data.clamp
+
+   userflag_hash = F"{mipmap}.{lod}.{clamp}"
+   file_hash = F"{name}.{os.path.getmtime(src_path)}"
+   comphash = F"{file_hash}.{dims[0]}.{dims[1]}.{fmt}.{userflag_hash}"
+
+   if img.cxr_data.last_hash != comphash:
+      print( F"Texture update: {img.filepath}" )
+
+      src = src_path.encode('utf-8')
+      dst = (asset_full_path('materials',img)+'.vtf').encode('utf-8')
+
+      flags_full = flags
+
+      # texture setting flags
+      if not lod: flags_full |= NBVTF_TEXTUREFLAGS_NOLOD
+      if clamp:
+         flags_full |= NBVTF_TEXTUREFLAGS_CLAMPS
+         flags_full |= NBVTF_TEXTUREFLAGS_CLAMPT
+
+      if libnbvtf_convert(src,dims[0],dims[1],mipmap,fmt,flags_full,dst):
+         img.cxr_data.last_hash = comphash
+
+   return name
+
+def compile_material(mat):
+   print( F"Compile {asset_full_path('materials',mat)}.vmt" )
+
+   info = material_info(mat)
+   properties = mat.cxr_data
+
+   props = []
+   
+   def _mlayer( layer ):
+      nonlocal properties, props
+
+      for decl in layer:
+         if isinstance(layer[decl],dict):    # $property definition
+            pdef = layer[decl]
+            ptype = pdef['type']
+
+            subdefines = False
+            default = None
+            prop = None
+
+            if 'shaders' in pdef and properties.shader not in pdef['shaders']:
+               continue
+
+            # Group expansion (does it have subdefinitions?)
+            for ch in pdef:
+               if isinstance(pdef[ch],dict):
+                  subdefines = True
+                  break
+            
+            expandview = False
+
+            if ptype == 'ui':
+               expandview = True
+            else:
+               if ptype == 'intrinsic':
+                  if decl in info:
+                     prop = info[decl]
+               else:
+                  prop = getattr(properties,decl)
+                  default = pdef['default']
+                  
+               if not isinstance(prop,str) and \
+                  not isinstance(prop,bpy.types.Image) and \
+                  hasattr(prop,'__getitem__'):
+                  prop = tuple([p for p in prop])
+
+               if prop != default:
+                  # write prop
+                  props += [(decl,pdef,prop)]
+                  
+                  if subdefines:
+                     expandview = True
+
+            if expandview: _mlayer(pdef)
+
+   _mlayer( cxr_shader_params )
+
+   with vdf_structure( F"{asset_full_path('materials',mat)}.vmt" ) as vmt:
+      vmt.node( properties.shader )
+      vmt.put( "// Convexer export\n" )
+
+      for pair in props:
+         decl = pair[0]
+         pdef = pair[1]
+         prop = pair[2]
+
+         def _numeric(v):
+            nonlocal pdef
+
+            if 'exponent' in pdef: return str(pow( v, pdef['exponent'] ))
+            else: return str(v)
+
+         if isinstance(prop,bpy.types.Image):
+            flags = 0
+            if 'flags' in pdef:
+               flags = pdef['flags']
+            vmt.kv( decl,compile_image(prop,flags))
+            
+         elif isinstance(prop,bool):
+            vmt.kv( decl, '1' if prop else '0' )
+         elif isinstance(prop,str):
+            vmt.kv( decl, prop )
+         elif isinstance(prop,float) or isinstance(prop,int):
+            vmt.kv( decl, _numeric(prop) )
+         elif isinstance(prop,tuple):
+            vmt.kv( decl, F"[{' '.join([_numeric(_) for _ in prop])}]" )
+         else:
+            vmt.put( F"// (cxr) unkown shader value type'{type(prop)}'" )
+
+      vmt.edon()
+
+class CXR_MATERIAL_PANEL(bpy.types.Panel):
+   bl_label="VMT Properties"
+   bl_idname="SCENE_PT_convexer_vmt"
+   bl_space_type='PROPERTIES'
+   bl_region_type='WINDOW'
+   bl_context="material"
+
+   def draw(_,context):
+      active_object = bpy.context.active_object
+      if active_object == None: return
+
+      active_material = active_object.active_material
+      if active_material == None: return
+
+      properties = active_material.cxr_data
+      info = material_info( active_material )
+
+      _.layout.label(text=F"{info['name']} @{info['res'][0]}x{info['res'][1]}")
+      _.layout.prop( properties, "shader" )
+
+      for xk in info:
+         _.layout.label(text=F"{xk}:={info[xk]}")
+      
+      def _mtex( name, img, uiParent ):
+         nonlocal properties
+         
+         box = uiParent.box()
+         box.label( text=F'{name} "{img.filepath}"' )
+         def _p2( x ):
+            if ((x & (x - 1)) == 0):
+               return x
+            closest = 0
+            closest_diff = 10000000
+            for i in range(16):
+               dist = abs((1 << i)-x)
+               if dist < closest_diff:
+                  closest_diff = dist
+                  closest = i
+            real = 1 << closest
+            if x > real:
+               return 1 << (closest+1)
+            if x < real:
+               return 1 << (closest-1)
+            return x
+
+         if img is not None:
+            row = box.row()
+            row.prop( img.cxr_data, "export_res" )
+            row.prop( img.cxr_data, "fmt" )
+
+            row = box.row()
+            row.prop( img.cxr_data, "mipmap" )
+            row.prop( img.cxr_data, "lod" )
+            row.prop( img.cxr_data, "clamp" )
+
+            img.cxr_data.export_res[0] = _p2( img.cxr_data.export_res[0] )
+            img.cxr_data.export_res[1] = _p2( img.cxr_data.export_res[1] )
+
+      def _mview( layer, uiParent ):
+         nonlocal properties
+
+         for decl in layer:
+            if isinstance(layer[decl],dict):    # $property definition
+               pdef = layer[decl]
+               ptype = pdef['type']
+               
+               thisnode = uiParent
+               expandview = True
+               drawthis = True
+
+               if 'shaders' in pdef and properties.shader not in pdef['shaders']:
+                  continue
+
+               if ptype == 'intrinsic':
+                  if decl not in info:
+                     drawthis = False
+               
+               if drawthis:
+                  for ch in pdef:
+                     if isinstance(pdef[ch],dict):
+                        if ptype == 'ui' or ptype == 'intrinsic':
+                           pass
+                        elif getattr(properties,decl) == pdef['default']:
+                           expandview = False
+                        
+                        thisnode = uiParent.box()
+                        break
+
+                  if ptype == 'ui':
+                     thisnode.label( text=decl )
+                  elif ptype == 'intrinsic':
+                     if isinstance(info[decl], bpy.types.Image):
+                        _mtex( decl, info[decl], thisnode )
+                     else:
+                        # hidden intrinsic value.
+                        # Means its a float array or something not an image
+                        thisnode.label( text=F"-- hidden intrinsic '{decl}' --" )
+                  else:
+                     thisnode.prop(properties,decl)
+                  if expandview: _mview(pdef,thisnode)
+
+      _mview( cxr_shader_params, _.layout )
+
+def cxr_entity_changeclass(_,context):
+   active_object = context.active_object
+
+   # Create ID properties
+   entdef = None
+   classname = active_object.cxr_data.classname 
+
+   if classname in cxr_entities:
+      entdef = cxr_entities[classname]
+
+      kvs = entdef['keyvalues']
+      if callable(kvs): kvs = kvs(active_object)
+
+      for k in kvs:
+         kv = kvs[k]
+         key = F'cxrkv_{k}'
+         
+         if callable(kv) or not isinstance(kv,dict): continue
+
+         if key not in active_object:
+            active_object[key] = kv['default']
+            id_prop = active_object.id_properties_ui(key)
+            id_prop.update(default=kv['default'])
+
+class CXR_ENTITY_PANEL(bpy.types.Panel):
+   bl_label="Entity Config"
+   bl_idname="SCENE_PT_convexer_entity"
+   bl_space_type='PROPERTIES'
+   bl_region_type='WINDOW'
+   bl_context="object"
+
+   def draw(_,context):
+      active_object = bpy.context.active_object
+
+      if active_object == None: return
+      
+      default_context = cxr_object_context( bpy.context.scene.cxr_data.scale_factor, 0.0 )
+      ecn = cxr_intrinsic_classname( active_object )
+      classname = cxr_custom_class( active_object )
+
+      if ecn == None: 
+         if active_object.type == 'MESH': _.layout.prop( active_object.cxr_data, 'brushclass' )
+         else: _.layout.prop( active_object.cxr_data, 'classname' )
+
+         if classname == 'NONE':
+            return
+      else: 
+         _.layout.label(text=F"<implementation defined ({ecn})>")
+         _.layout.enabled=False
+         classname = ecn
+      
+      kvs = cxr_entity_keyvalues( active_object, default_context, classname )
+      if kvs != None:
+         for kv in kvs:
+            if kv[1]:
+               _.layout.prop( active_object, F'["cxrkv_{kv[0]}"]', text=kv[0])
+            else:
+               row = _.layout.row()
+               row.enabled = False
+               row.label( text=F'{kv[0]}: {repr(kv[2])}' )
+      else:
+         _.layout.label( text=F"ERROR: NO CLASS DEFINITION" )
+
+class CXR_LIGHT_PANEL(bpy.types.Panel):
+   bl_label = "Source Settings"
+   bl_idname = "LIGHT_PT_cxr"
+   bl_space_type = 'PROPERTIES'
+   bl_region_type = 'WINDOW'
+   bl_context = "data"
+   
+   def draw(self, context):
+      layout = self.layout
+      scene = context.scene
+
+      active_object = bpy.context.active_object
+      if active_object == None: return
+      
+      if active_object.type == 'LIGHT' or \
+         active_object.type == 'LIGHT_PROBE':
+
+         properties = active_object.data.cxr_data
+
+         if active_object.type == 'LIGHT':
+            layout.prop( properties, "realtime" )
+         elif active_object.type == 'LIGHT_PROBE':
+            layout.prop( properties, "size" )
+
+class CXR_IMAGE_SETTINGS(bpy.types.PropertyGroup):
+   export_res: bpy.props.IntVectorProperty(
+      name="",
+      description="Texture Export Resolution",
+      default=(512,512),
+      min=1,
+      max=4096,
+      size=2)
+
+   fmt: bpy.props.EnumProperty(
+      name="Format", 
+      items = [
+      ('DXT1', "DXT1", "BC1 compressed", '', 0),
+      ('DXT5', "DXT5", "BC3 compressed", '', 1),
+      ('RGB', "RGB", "Uncompressed", '', 2),
+      ('RGBA', "RGBA", "Uncompressed (with alpha)", '', 3)
+      ],
+      description="Image format", 
+      default=0)
+   
+   last_hash: bpy.props.StringProperty( name="" )
+   asset_id: bpy.props.IntProperty(name="intl_assetid",default=0)
+   
+   mipmap: bpy.props.BoolProperty(name="MIP",default=True)
+   lod: bpy.props.BoolProperty(name="LOD",default=True)
+   clamp: bpy.props.BoolProperty(name="CLAMP",default=False)
+
+class CXR_LIGHT_SETTINGS(bpy.types.PropertyGroup):
+   realtime: bpy.props.BoolProperty(name="Realtime Light", default=True)
+
+class CXR_CUBEMAP_SETTINGS(bpy.types.PropertyGroup):
+   size: bpy.props.EnumProperty(
+      name="Resolution",
+      items = [
+      ('1',"1x1",'','',0),
+      ('2',"2x2",'','',1),
+      ('3',"4x4",'','',2),
+      ('4',"8x8",'','',3),
+      ('5',"16x16",'','',4),
+      ('6',"32x32",'','',5),
+      ('7',"64x64",'','',6),
+      ('8',"128x128",'','',7),
+      ('9',"256x256",'','',8)
+      ],
+      description="Texture resolution",
+      default=7)
+
+class CXR_ENTITY_SETTINGS(bpy.types.PropertyGroup):
+   entity: bpy.props.BoolProperty(name="")
+
+   enum_pointents = [('NONE',"None","")]
+   enum_brushents = [('NONE',"None","")]
+   
+   for classname in cxr_entities:
+      entdef = cxr_entities[classname]
+      if 'allow' in entdef:
+         itm = [(classname, classname, "")]
+         if 'EMPTY' in entdef['allow']: enum_pointents += itm
+         else: enum_brushents += itm
+
+   classname: bpy.props.EnumProperty(items=enum_pointents, name="Class", \
+         update=cxr_entity_changeclass, default='NONE' )
+
+   brushclass: bpy.props.EnumProperty(items=enum_brushents, name="Class", \
+         update=cxr_entity_changeclass, default='NONE' )
+
+class CXR_MODEL_SETTINGS(bpy.types.PropertyGroup):
+   last_hash: bpy.props.StringProperty( name="" )
+   asset_id: bpy.props.IntProperty(name="vmf_settings",default=0)
+
+class CXR_SCENE_SETTINGS(bpy.types.PropertyGroup):
+   project_name: bpy.props.StringProperty( name="Project Name" )
+   subdir: bpy.props.StringProperty( name="Subdirectory" )
+   
+   exe_studiomdl: bpy.props.StringProperty( name="studiomdl" )
+   exe_vbsp: bpy.props.StringProperty( name="vbsp" )
+   opt_vbsp: bpy.props.StringProperty( name="args" )
+   exe_vvis: bpy.props.StringProperty( name="vvis" )
+   opt_vvis: bpy.props.StringProperty( name="args" )
+   exe_vrad: bpy.props.StringProperty( name="vrad" )
+   opt_vrad: bpy.props.StringProperty( name="args" )
+
+   debug: bpy.props.BoolProperty(name="Debug",default=False)
+   scale_factor: bpy.props.FloatProperty(name="VMF Scale factor",default=32.0,min=1.0)
+   skybox_scale_factor: bpy.props.FloatProperty(name="Sky Scale factor",default=1.0,min=0.01)
+   skybox_offset: bpy.props.FloatProperty(name="Sky offset",default=-4096.0)
+   light_scale: bpy.props.FloatProperty(name="Light Scale",default=1.0/5.0)
+   displacement_cardinal: bpy.props.BoolProperty(name="Cardinal displacements",default=True)
+   include_names: bpy.props.BoolProperty(name="Append original file names",default=True)
+   lightmap_scale: bpy.props.IntProperty(name="Global Lightmap Scale",default=12)
+
+class CXR_DETECT_COMPILERS(bpy.types.Operator):
+   bl_idname="convexer.detect_compilers"
+   bl_label="Find compilers"
+   
+   def execute(self,context):
+      scene = context.scene
+      settings = scene.cxr_data
+      subdir = settings.subdir
+
+      for exename in ['studiomdl','vbsp','vvis','vrad']:
+         searchpath = os.path.normpath(F'{subdir}/../bin/{exename}.exe')
+         if os.path.exists(searchpath):
+            settings[F'exe_{exename}'] = searchpath
+
+      return {'FINISHED'}
+
+classes = [ CXR_RELOAD, CXR_DECOMPOSE_SOLID, CXR_INTERFACE, \
+            CXR_WRITE_VMF, CXR_MATERIAL_PANEL, CXR_IMAGE_SETTINGS,\
+            CXR_MODEL_SETTINGS, CXR_ENTITY_SETTINGS, CXR_CUBEMAP_SETTINGS,\
+            CXR_LIGHT_SETTINGS, CXR_SCENE_SETTINGS, CXR_DETECT_COMPILERS,\
+            CXR_ENTITY_PANEL, CXR_LIGHT_PANEL ]
+
+def register():
+   global debug_draw_handler, vmt_param_dynamic_class
+
+   for c in classes:
+      bpy.utils.register_class(c)
+
+   # Build dynamic VMT properties class defined by cxr_shader_params
+   annotations_dict = {}
+
+   def _dvmt_propogate(layer):
+      nonlocal annotations_dict
+
+      for decl in layer:
+         if isinstance(layer[decl],dict):    # $property definition
+            pdef = layer[decl]
+            
+            prop = None
+            if pdef['type'] == 'bool':
+               prop = bpy.props.BoolProperty(\
+                           name = pdef['name'],\
+                           default = pdef['default'])
+
+            elif pdef['type'] == 'float':
+               prop = bpy.props.FloatProperty(\
+                     name = pdef['name'],\
+                     default = pdef['default'])
+
+            elif pdef['type'] == 'vector':
+               if 'subtype' in pdef:
+                  prop = bpy.props.FloatVectorProperty(\
+                     name = pdef['name'],\
+                     subtype = pdef['subtype'],\
+                     default = pdef['default'],\
+                     size = len(pdef['default']))
+               else:
+                  prop = bpy.props.FloatVectorProperty(\
+                     name = pdef['name'],\
+                     default = pdef['default'],\
+                     size = len(pdef['default']))
+
+            elif pdef['type'] == 'string':
+               prop = bpy.props.StringProperty(\
+                           name = pdef['name'],\
+                           default = pdef['default'])
+
+            elif pdef['type'] == 'enum':
+               prop = bpy.props.EnumProperty(\
+                           name = pdef['name'],\
+                           items = pdef['items'],\
+                           default = pdef['default'])
+
+            if prop != None:
+               annotations_dict[decl] = prop
+            
+            # Recurse into sub-definitions
+            _dvmt_propogate(pdef)
+   
+   annotations_dict["shader"] = bpy.props.EnumProperty(\
+      name = "Shader",\
+      items = [( _,\
+                 cxr_shaders[_]["name"],\
+                 '') for _ in cxr_shaders],\
+      default = next(iter(cxr_shaders)))
+   
+   annotations_dict["asset_id"] = bpy.props.IntProperty(name="intl_assetid",default=0)
+
+   _dvmt_propogate( cxr_shader_params )
+   vmt_param_dynamic_class = type(
+      "CXR_VMT_DYNAMIC",
+      (bpy.types.PropertyGroup,),{
+         "__annotations__": annotations_dict
+      },
+   )
+
+   bpy.utils.register_class( vmt_param_dynamic_class )
+
+   # Pointer types
+   bpy.types.Material.cxr_data = \
+      bpy.props.PointerProperty(type=vmt_param_dynamic_class)
+   bpy.types.Image.cxr_data = \
+      bpy.props.PointerProperty(type=CXR_IMAGE_SETTINGS)
+   bpy.types.Object.cxr_data = \
+      bpy.props.PointerProperty(type=CXR_ENTITY_SETTINGS)
+   bpy.types.Collection.cxr_data = \
+      bpy.props.PointerProperty(type=CXR_MODEL_SETTINGS)
+   bpy.types.Light.cxr_data = \
+      bpy.props.PointerProperty(type=CXR_LIGHT_SETTINGS)
+   bpy.types.LightProbe.cxr_data = \
+      bpy.props.PointerProperty(type=CXR_CUBEMAP_SETTINGS)
+   bpy.types.Scene.cxr_data = \
+      bpy.props.PointerProperty(type=CXR_SCENE_SETTINGS)
+
+   # CXR Scene settings
+
+   # GPU / callbacks
+   debug_draw_handler = bpy.types.SpaceView3D.draw_handler_add(\
+      cxr_draw,(),'WINDOW','POST_VIEW')
+
+   bpy.app.handlers.load_post.append(cxr_on_load)
+   bpy.app.handlers.depsgraph_update_post.append(cxr_dgraph_update)
+
+def unregister():
+   global debug_draw_handler, vmt_param_dynamic_class
+
+   bpy.utils.unregister_class( vmt_param_dynamic_class )
+   for c in classes:
+      bpy.utils.unregister_class(c)
+   
+   bpy.app.handlers.depsgraph_update_post.remove(cxr_dgraph_update)
+   bpy.app.handlers.load_post.remove(cxr_on_load)
+
+   bpy.types.SpaceView3D.draw_handler_remove(debug_draw_handler,'WINDOW')

diff --git a/src/convexer.c b/src/convexer.c
new file mode 100644 (file)
index 0000000..7669e97
--- /dev/null
+++ b/src/convexer.c
@@ -0,0 +1,2052 @@
+/*
+                              CONVEXER v0.8
+
+               A GNU/Linux-first Source1 Hammer replacement
+                    built with Blender, for mapmakers
+
+                  Copyright (C) 2022 Harry Godden (hgn)
+
+   Features:
+      - Brush decomposition into convex pieces for well defined geometry
+      - Freely form displacements without limits
+      - Build your entire map in Blender
+      - Compile models and model groups easily
+      - Light patch BSP files; remove unwanted realtime effects
+      - Fastest VTF compressor (thanks to Richgel999 and stb)
+
+   To come:
+      - high quality level overviews automatically for CS:GO (csRadar)
+
+   Program structure:
+
+   File/folder       Lang     Purpose
+   src/
+     __init__.py     Python   Blender plugin interface
+     convexer.c      C        Heavy lifting; brush decomp, mesh processing
+     cxr_math.h      C        Vector maths and other handy things
+     cxr_mem.h       C        Automatic resizing buffers
+     nbvtf/
+       nbvtf.h       C        VTF processing interface
+       librgcx.h     C++      Rich Geldreich's DXT1/DXT5 compressors
+       stb/          C        Sean Barrets image I/O
+*/
+
+#include <stdio.h>
+#include <math.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+const char *cxr_build_time = __DATE__ " @" __TIME__;
+
+typedef uint8_t        u8;
+typedef uint16_t       u16;
+typedef uint32_t       u32;
+typedef uint64_t       u64;
+typedef int8_t         i8;
+typedef int16_t        i16;
+typedef int32_t        i32;
+typedef int64_t        i64;
+
+typedef unsigned int uint;
+
+typedef double         v2f[2];
+typedef double         v3f[3];
+typedef double         v4f[4];
+typedef v3f                    m3x3f[3];
+typedef v3f                    m4x3f[4];
+typedef v3f                    boxf[2];
+
+#define CXR_EPSILON 0.001
+#define CXR_INTERIOR_ANGLE_MAX 0.998
+#define CXR_API 
+#define CXR_DIRTY_OPTIMISATION 1
+#define CXR_DEBUG_WRITE_MESH 1
+#define CXR_DEBUG_ALLOCATORS 1
+#define CXR_MANIFOLD_DEBUG 0
+
+#define CXR_ERROR_DEGEN_IMPLICIT 0x1
+#define CXR_ERROR_BAD_MANIFOLD 0x2
+#define CXR_ERROR_NO_SOLIDS 0x4
+
+#include "cxr_math.h"
+#include "cxr_mem.h"
+
+// Utility
+// ============================================
+
+static v4f colours_random[] = 
+{
+   { 0.863, 0.078, 0.235, 0.4 },
+   { 0.000, 0.980, 0.604, 0.4 },
+   { 0.118, 0.565, 1.000, 0.4 },
+   { 0.855, 0.439, 0.839, 0.4 },
+   { 0.824, 0.412, 0.118, 0.4 },
+   { 0.125, 0.698, 0.667, 0.4 },
+   { 0.541, 0.169, 0.886, 0.4 },
+   { 1.000, 0.843, 0.000, 0.4 }
+};
+
+static int cxr_range(int x, int bound)
+{
+   if( x < 0 )
+      x += bound * (x/bound + 1);
+   
+   return x % bound;
+}
+
+struct cxr_input_mesh
+{
+   v3f *vertices;
+   
+   struct cxr_edge
+   {
+      i32 i0, i1;
+   }
+   *edges;
+
+   struct cxr_input_loop
+   {
+      i32 index,
+          edge_index;
+      v2f uv;
+   }
+   *loops;
+
+   struct cxr_polygon
+   {
+      i32 loop_start, loop_total;
+      v3f normal;
+      v3f center;
+      i32 material_id;  // -1: interior material
+   }
+   *polys;
+   
+   struct cxr_material
+   {
+      i32 res[2];
+      const char *vmt_path;
+   }
+   *materials;
+
+   i32 poly_count,
+       vertex_count,
+       edge_count,
+       loop_count,
+       material_count;
+};
+
+struct cxr_loop
+{
+   i32 poly_left,
+       poly_right,
+       edge_index,
+       index;
+   v2f uv;
+};
+
+struct cxr_solid
+{
+   i32 *polygons;
+};
+
+struct cxr_mesh
+{
+   struct cxr_auto_buffer
+      edges,
+      loops,
+      polys;
+};
+
+struct cxr_texinfo
+{
+   v3f uaxis, vaxis;
+   v2f offset, scale;
+};
+
+// simple VDF writing interface
+struct cxr_vdf
+{
+   FILE *fp;
+   i32 level;
+};
+
+static struct cxr_settings
+{
+   i32 debug,
+       lightmap_scale;
+
+   double light_scale;
+}
+cxr_settings = {
+   .debug = 0,
+   .lightmap_scale = 12,
+
+   .light_scale = 1.0/5.0
+};
+
+static struct cxr_context
+{
+   i32 brush_count,
+       entity_count,
+       face_count;
+
+   double scale_factor;
+   double offset_z;
+}
+cxr_context = {
+   .brush_count = 0,
+   .entity_count = 0,
+   .face_count = 0,
+   .scale_factor = 32.0,
+   .offset_z = 0.0
+};
+
+static struct cxr_material cxr_nodraw = {
+   .res = { 512, 512 },
+   .vmt_path = "tools/toolsnodraw"
+};
+
+// Debugging callbacks
+// =============================================================================
+
+static v4f colour_error = { 1.0f, 0.0f, 0.0f, 1.0f };
+static v4f colour_face_graph = { 1.0f, 1.0f, 1.0f, 0.03f };
+static v4f colour_success = { 0.0f, 1.0f, 0.0f, 1.0f };
+
+static void (*cxr_log_func)(const char *str);
+static void (*cxr_line_func)( v3f p0, v3f p1, v4f colour );
+
+static void cxr_log( const char *fmt, ... )
+{
+   char buf[512];
+
+   va_list args;
+   va_start( args, fmt );
+   vsnprintf( buf, sizeof(buf)-1, fmt, args );
+   va_end(args);
+
+   if( cxr_log_func )
+      cxr_log_func( buf );
+
+   fputs(buf,stdout);
+}
+
+static void cxr_debug_line( v3f p0, v3f p1, v4f colour )
+{
+   if( cxr_line_func )
+      cxr_line_func( p0, p1, colour );
+}
+
+static void cxr_debug_box( v3f p0, double sz, v4f colour )
+{
+   v3f a,b,c,d,
+       a1,b1,c1,d1;
+   v3_add(p0, (v3f){-sz,-sz,-sz}, a);
+   v3_add(p0, (v3f){-sz, sz,-sz}, b);
+   v3_add(p0, (v3f){ sz, sz,-sz}, c);
+   v3_add(p0, (v3f){ sz,-sz,-sz}, d);
+   v3_add(p0, (v3f){-sz,-sz,sz}, a1);
+   v3_add(p0, (v3f){-sz, sz,sz}, b1);
+   v3_add(p0, (v3f){ sz, sz,sz}, c1);
+   v3_add(p0, (v3f){ sz,-sz,sz}, d1);
+
+   cxr_debug_line( a,b, colour );
+   cxr_debug_line( b,c, colour );
+   cxr_debug_line( c,d, colour );
+   cxr_debug_line( d,a, colour );
+   cxr_debug_line( a1,b1, colour );
+   cxr_debug_line( b1,c1, colour );
+   cxr_debug_line( c1,d1, colour );
+   cxr_debug_line( d1,a1, colour );
+   cxr_debug_line( a,a1, colour );
+   cxr_debug_line( b,b1, colour );
+   cxr_debug_line( c,c1, colour );
+   cxr_debug_line( d,d1, colour );
+}
+
+static void cxr_debug_arrow( v3f p0, v3f p1, v3f normal, double sz, v4f colour )
+{
+   v3f dir, tan, p2, p3;
+   v3_sub(p1,p0,dir);
+   v3_normalize(dir);
+
+   v3_cross(dir,normal,tan);
+   v3_muladds( p1,dir, -sz, p2 );
+   v3_muladds( p2,tan,sz,p3 );
+   cxr_debug_line( p1, p3, colour );
+   v3_muladds( p2,tan,-sz,p3 );
+   cxr_debug_line( p1, p3, colour );
+   cxr_debug_line( p0, p1, colour );
+}
+
+// Public API
+// =========================================================================
+
+CXR_API void cxr_context_reset(void)
+{
+   cxr_context.brush_count = 0;
+   cxr_context.entity_count = 0;
+   cxr_context.face_count = 0;
+   cxr_context.offset_z = 0.0;
+   cxr_context.scale_factor = 32.0;
+}
+
+CXR_API void cxr_set_offset(double offset)
+{
+   cxr_context.offset_z = offset;
+}
+
+CXR_API void cxr_set_scale_factor(double scale)
+{
+   cxr_context.scale_factor = scale;
+}
+
+CXR_API struct cxr_vdf *cxr_vdf_open(const char *path)
+{
+   struct cxr_vdf *vdf = malloc(sizeof(struct cxr_vdf));
+
+   vdf->level = 0;
+   vdf->fp = fopen( path, "w" );
+
+   if( !vdf->fp )
+   {
+      free( vdf );
+      return NULL;
+   }
+
+   return vdf;
+}
+
+CXR_API void cxr_vdf_close(struct cxr_vdf *vdf)
+{
+   fclose( vdf->fp );
+}
+
+CXR_API void cxr_vdf_put(struct cxr_vdf *vdf, const char *str)
+{
+   for( int i=0; i<vdf->level; i++ )
+      fputs( " ", vdf->fp );
+
+   fputs( str, vdf->fp );
+}
+
+static void cxr_vdf_printf( struct cxr_vdf *vdf, const char *fmt, ... )
+{
+   cxr_vdf_put(vdf,"");
+
+   va_list args;
+   va_start( args, fmt );
+   vfprintf( vdf->fp, fmt, args );
+   va_end(args);
+}
+
+CXR_API void cxr_vdf_node(struct cxr_vdf *vdf, const char *str)
+{
+   cxr_vdf_put( vdf, str );
+   putc( (u8)'\n', vdf->fp );
+   cxr_vdf_put( vdf, "{\n" );
+
+   vdf->level ++;
+}
+
+CXR_API void cxr_vdf_edon(struct cxr_vdf *vdf)
+{
+   vdf->level --;
+   cxr_vdf_put( vdf, "}\n" );
+}
+
+CXR_API void cxr_vdf_kv(struct cxr_vdf *vdf, const char *strk, const char *strv)
+{
+   cxr_vdf_printf( vdf, "\"%s\" \"%s\"\n", strk, strv );
+}
+
+static void cxr_vdf_ki32(struct cxr_vdf *vdf, const char *strk, i32 val)
+{
+   cxr_vdf_printf( vdf, "\"%s\" \"%d\"\n", strk, val );
+}
+static void cxr_vdf_kdouble(struct cxr_vdf *vdf, const char *strk, double val)
+{
+   cxr_vdf_printf( vdf, "\"%s\" \"%f\"\n", strk, val );
+}
+static void cxr_vdf_kaxis(struct cxr_vdf *vdf, const char *strk, v3f normal, double offset, double scale)
+{
+   cxr_vdf_printf( vdf, "\"%s\" \"[%f %f %f %f] %f\"\n", strk, normal[0],normal[1],normal[2],offset,scale );
+}
+static void cxr_vdf_plane(struct cxr_vdf *vdf, const char *strk, v3f a, v3f b, v3f c )
+{
+   cxr_vdf_printf( vdf, "\"%s\" \"(%f %f %f) (%f %f %f) (%f %f %f)\"\n",
+         strk, a[0], a[1], a[2], b[0], b[1], b[2], c[0], c[1], c[2] );
+}
+static void cxr_vdf_colour255(struct cxr_vdf *vdf, const char *strk, v4f colour)
+{
+   v4f scale;
+   v4_muls( colour, 255.0, scale );
+   cxr_vdf_printf( vdf, "\"%s\" \"%d %d %d %d\"\n",strk,(int)scale[0], (int)scale[1], (int)scale[2], (int)scale[3]);
+}
+
+// Public API
+// =========================================================================
+
+static void cxr_debug_poly(struct cxr_mesh *mesh, struct cxr_polygon *poly, v3f *verts, v4f colour )
+{
+   for( int i=0; i<poly->loop_total; i++ )
+   {
+      struct cxr_loop *loop0 = cxr_ab_ptr(&mesh->loops,poly->loop_start+i),
+                      *loop1 = cxr_ab_ptr(&mesh->loops,poly->loop_start+cxr_range(i+1,poly->loop_total));
+
+      v3f p0, p1;
+      
+      v3_lerp( verts[loop0->index], poly->center, 0.02, p0 );
+      v3_lerp( verts[loop1->index], poly->center, 0.02, p1 );
+
+      cxr_debug_arrow( p0, p1, poly->normal, 0.05, colour );
+   }
+
+   v3f nrm0;
+   v3_muladds( poly->center, poly->normal, 0.3, nrm0 );
+
+   cxr_debug_line( poly->center, nrm0, colour );
+}
+
+static void cxr_debug_mesh(struct cxr_mesh *mesh, v3f *verts, v4f colour )
+{
+   for( int i=0; i<mesh->polys.count; i++ )
+   {
+      struct cxr_polygon *poly = cxr_ab_ptr(&mesh->polys,i);
+      cxr_debug_poly( mesh, poly, verts, colour );
+   }
+}
+
+static struct cxr_mesh *cxr_alloc_mesh(int edge_count, int loop_count, int poly_count )
+{
+   struct cxr_mesh *mesh = malloc(sizeof(struct cxr_mesh));
+   cxr_ab_init(&mesh->edges, sizeof(struct cxr_edge), edge_count);
+   cxr_ab_init(&mesh->loops, sizeof(struct cxr_loop), loop_count);
+   cxr_ab_init(&mesh->polys, sizeof(struct cxr_polygon), poly_count);
+   return mesh;
+}
+
+static void cxr_free_mesh(struct cxr_mesh *mesh)
+{
+   cxr_ab_free(&mesh->edges);
+   cxr_ab_free(&mesh->loops);
+   cxr_ab_free(&mesh->polys);
+   free(mesh);
+}
+
+// Rebuilds edge data and reallocates
+//
+static void cxr_mesh_clean_edges(struct cxr_mesh *mesh)
+{
+   struct cxr_auto_buffer new_edges;
+   cxr_ab_init( &new_edges, sizeof(struct cxr_edge), mesh->edges.count );
+
+   for( int i=0; i<mesh->polys.count; i++ )
+   {
+      struct cxr_polygon *poly = cxr_ab_ptr(&mesh->polys,i);
+      for( int j=0; j<poly->loop_total; j++ )
+      {
+         struct cxr_loop
+            *lp0 = cxr_ab_ptr(&mesh->loops,poly->loop_start+j),
+            *lp1 = cxr_ab_ptr(&mesh->loops,poly->loop_start+cxr_range(j+1,poly->loop_total));
+         
+         int i0 = cxr_min(lp0->index, lp1->index),
+             i1 = cxr_max(lp0->index, lp1->index);
+         
+         // See if edge exists before adding it
+         for( int k=0; k<new_edges.count; k++ )
+         {
+            struct cxr_edge *edge = cxr_ab_ptr(&new_edges,k);
+
+            if( edge->i0 == i0 && edge->i1 == i1 )
+            {
+               lp0->edge_index = k;
+               goto IL_EDGE_CREATED;
+            }
+         }
+         
+         int orig_edge_id = lp0->edge_index;
+         lp0->edge_index = new_edges.count;
+
+         struct cxr_edge edge = { i0, i1 };
+         // --- ! ---
+         // Copy extra information (sharp,freestyle.. etc) here!
+         //
+         // if orig_edge_id < mesh->edges.count: edge.foo = mesh->edges[orig].foo
+         // --- ! ---
+         cxr_ab_push( &new_edges, &edge );
+
+IL_EDGE_CREATED:;
+      }
+   }
+
+   cxr_ab_free( &mesh->edges );
+   mesh->edges = new_edges;
+}
+
+// Remove 0-length faces from mesh and correct loops
+//
+static void cxr_mesh_clean_faces(struct cxr_mesh *mesh)
+{
+   struct cxr_auto_buffer loops_new;
+   cxr_ab_init( &loops_new, sizeof(struct cxr_loop), mesh->loops.count );
+
+   int new_length=0;
+   for( int i=0; i<mesh->polys.count; i++ )
+   {
+      struct cxr_polygon *src = cxr_ab_ptr(&mesh->polys,i),
+                         *dst = cxr_ab_ptr(&mesh->polys,new_length);
+
+      if( src->loop_total > 0 )
+      {
+         int src_start = src->loop_start,
+             src_total = src->loop_total;
+
+         *dst = *src;
+         dst->loop_start = loops_new.count;
+         
+         for( int j=0; j<src_total; j++ )
+         {
+            struct cxr_loop *loop = cxr_ab_ptr(&mesh->loops,src_start+j),
+                            *ldst = cxr_ab_ptr(&loops_new,dst->loop_start+j);
+            *ldst = *loop;
+            ldst->poly_left = new_length;
+         }
+         
+         loops_new.count += src_total;
+         new_length ++;
+      }
+   }
+
+   cxr_ab_free( &mesh->loops );
+   mesh->loops = loops_new;
+   mesh->polys.count = new_length;
+}
+
+static i32 *cxr_mesh_link_loops(struct cxr_mesh *mesh)
+{
+   i32 *polygon_edge_map = malloc(mesh->edges.count*2 *sizeof(i32));
+
+   for( int i = 0; i < mesh->edges.count*2; i ++ )
+      polygon_edge_map[i] = -1;
+   
+   for( int i = 0; i < mesh->polys.count; i ++ )
+   {
+      struct cxr_polygon *poly = cxr_ab_ptr(&mesh->polys, i);
+
+      for( int j = 0; j < poly->loop_total; j ++ )
+      {
+         struct cxr_loop *loop = cxr_ab_ptr(&mesh->loops, poly->loop_start+j);
+         loop->poly_left = i;
+
+         for( int k = 0; k < 2; k ++ )
+         {
+            i32 *edge = &polygon_edge_map[loop->edge_index*2+k];
+
+            if( *edge == -1 )
+            {
+               *edge = i;
+               break;
+            }
+         }
+      }
+   }
+   for( int i = 0; i < mesh->polys.count; i ++ )
+   {
+      struct cxr_polygon *poly = cxr_ab_ptr(&mesh->polys,i);
+
+      for( int j = 0; j < poly->loop_total; j ++ )
+      {
+         struct cxr_loop *loop = cxr_ab_ptr(&mesh->loops,poly->loop_start+j);
+
+         i32 *face_map = &polygon_edge_map[loop->edge_index*2];
+
+         if( face_map[0] == loop->poly_left ) loop->poly_right = face_map[1];
+         else loop->poly_right = face_map[0];
+      }
+   }
+
+   return polygon_edge_map;
+}
+
+// Add polygon to mesh based on loop array
+static struct cxr_polygon *cxr_create_poly( struct cxr_mesh *mesh, v3f *vertices, struct cxr_loop poly[],
+   int len, int start, int max )
+{
+   if( len < 3 )
+   {
+      cxr_log( "tried to add new poly with length %d!\n", len );
+      
+      if( len >= 2 )
+      {
+         for( int j=0; j<len; j++ )
+         {
+            int i0 = poly[j].index,
+                i1 = poly[cxr_range(j+1,len)].index;
+            cxr_debug_line( vertices[i0], vertices[i1], colour_error );
+         }
+      }
+
+      return NULL;
+   }
+
+   int nface_id = mesh->polys.count;
+   struct cxr_polygon *new_face = cxr_ab_empty(&mesh->polys);
+
+   new_face->loop_start = mesh->loops.count;
+   new_face->loop_total = len;
+   new_face->material_id = -1;
+
+   // Calculate normal and center
+   v3_zero( new_face->center );
+
+   for( int j=0; j<len; j++ )
+   {
+      int i0 = poly[cxr_range(start+j,max)].index;
+      struct cxr_loop *new_loop = cxr_ab_empty(&mesh->loops);
+
+      new_loop->poly_left = nface_id;
+      new_loop->poly_right = -1;
+      new_loop->index = i0;
+      new_loop->edge_index = 0;
+      v2_zero(new_loop->uv);
+
+      v3_add( new_face->center, vertices[new_loop->index], new_face->center );
+   }
+   v3_divs( new_face->center, new_face->loop_total, new_face->center );
+   
+   struct cxr_loop *lp0 = cxr_ab_ptr( &mesh->loops, new_face->loop_start ),
+                   *lp1 = cxr_ab_ptr( &mesh->loops, new_face->loop_start+1 ),
+                   *lp2 = cxr_ab_ptr( &mesh->loops, new_face->loop_start+2 );
+   
+   tri_normal( vertices[lp0->index], vertices[lp1->index], vertices[lp2->index], new_face->normal );
+
+   return cxr_ab_ptr(&mesh->polys, nface_id);
+}
+
+// Get the 'next' mesh island
+//
+// Returns NULL if there is only one island
+static struct cxr_mesh *cxr_pull_island(struct cxr_mesh *mesh)
+{
+   free(cxr_mesh_link_loops(mesh));
+
+   int *island_current = malloc(mesh->polys.count*sizeof(int)),
+        island_len = 1,
+        loop_count = 0,
+        last_count;
+
+   island_current[0] = 0;
+
+   IL_ISLAND_REPEAT:
+   last_count = island_len;
+
+   for( int i=0; i<island_len; i++ )
+   {
+      struct cxr_polygon *poly = cxr_ab_ptr(&mesh->polys,island_current[i]);
+
+      for( int j=0; j<poly->loop_total; j++ )
+      {
+         struct cxr_loop *loop = cxr_ab_ptr(&mesh->loops, poly->loop_start+j);
+
+         if( loop->poly_right != -1 )
+         {
+            int face_present = 0;
+
+            for( int k=0; k<island_len; k++ )
+            {
+               if( island_current[k] == loop->poly_right )
+               {
+                  face_present = 1;
+                  break;
+               }
+            }
+
+            if( !face_present )
+            {
+               island_current[ island_len ++ ] = loop->poly_right;
+            }
+         }
+      }
+   }
+
+   if( island_len > last_count )
+      goto IL_ISLAND_REPEAT;
+
+   if( island_len == mesh->polys.count )
+   {
+      free( island_current );
+      return NULL;
+   }
+
+   for( int i=0; i<island_len; i++ )
+   {
+      struct cxr_polygon *poly = cxr_ab_ptr(&mesh->polys, island_current[i]);
+      loop_count += poly->loop_total;
+   }
+
+   struct cxr_mesh *newmesh = cxr_alloc_mesh( mesh->edges.count, loop_count, island_len );
+
+   for( int i=0; i<island_len; i++ )
+   {
+      struct cxr_polygon *src = cxr_ab_ptr(&mesh->polys, island_current[i]);
+      struct cxr_polygon *dst = cxr_ab_ptr(&newmesh->polys, i);
+      
+      *dst = *src;
+      dst->loop_start = newmesh->loops.count;
+
+      for( int j=0; j<src->loop_total; j++ )
+      {
+         struct cxr_loop *lsrc = cxr_ab_ptr(&mesh->loops, src->loop_start+j),
+                         *ldst = cxr_ab_ptr(&newmesh->loops, dst->loop_start+j);
+
+         *ldst = *lsrc;
+         ldst->poly_left = i;
+         ldst->poly_right = -1;
+      }
+
+      newmesh->loops.count += src->loop_total;
+      src->loop_total = -1;
+   }
+
+   newmesh->polys.count = island_len;
+   newmesh->edges.count = mesh->edges.count;
+   memcpy(cxr_ab_ptr(&newmesh->edges,0), cxr_ab_ptr(&mesh->edges,0), mesh->edges.count*sizeof(struct cxr_edge));
+
+   cxr_mesh_clean_faces(mesh);
+   cxr_mesh_clean_edges(mesh);
+   cxr_mesh_clean_edges(newmesh);
+   free( island_current );
+
+   return newmesh;
+}
+
+// Return best availible solid from mesh, and patch existing mesh to fill the gap
+// creted by it. 
+//
+// Returns NULL if shape is already convex or empty
+// Destroys edge data!
+static struct cxr_mesh *cxr_pull_best_solid(
+      struct cxr_mesh *mesh, 
+      struct cxr_auto_buffer *vert_buffer, 
+      int preserve_hot_edges,
+      u32 *error )
+{
+   v3f *vertices = cxr_ab_ptr( vert_buffer, 0 );
+
+   i32 *polygon_edge_map = cxr_mesh_link_loops(mesh);
+
+   for( int i=0; i<mesh->edges.count*2; i++ )
+      if( polygon_edge_map[i] == -1 )
+      {
+         cxr_log( "non-manifold edges are in the mesh; implicit internal geometry does not have full support\n" );
+         free(polygon_edge_map);
+         return NULL;
+      }
+
+   int *vertex_tagged = malloc( vert_buffer->count*sizeof(int) );
+   int *edge_tagged = malloc( mesh->edges.count*sizeof(int) );
+   
+   for( int i=0; i<mesh->edges.count; i++ )
+   {
+      struct cxr_polygon *polya = cxr_ab_ptr(&mesh->polys, polygon_edge_map[i*2+0]),
+                         *polyb = cxr_ab_ptr(&mesh->polys, polygon_edge_map[i*2+1]);
+      v4f planeb;
+      normal_to_plane(polyb->normal, polyb->center, planeb);
+      
+      edge_tagged[i] = 0;
+      for( int j=0; j<polya->loop_total; j++ )
+      {
+         struct cxr_loop *loop = cxr_ab_ptr(&mesh->loops, polya->loop_start+j);
+         if( plane_polarity( planeb, vertices[loop->index] ) > 0.001 ||
+             v3_dot(polya->normal,polyb->normal) > 0.98500 )
+         {
+            edge_tagged[i] = 1;
+            break;
+         }
+      }
+   }
+
+   // Tag 'reflex' vertices
+   int *connected_planes = malloc(mesh->polys.count*sizeof(int));
+
+   for( int i=0; i<vert_buffer->count; i++ )
+   {
+      vertex_tagged[i]=0;
+      
+      int num_connected = 0;
+      // Create a list of polys that ref this vert
+      for( int j=0; j<mesh->polys.count; j++ )
+      {
+         struct cxr_polygon *poly = cxr_ab_ptr(&mesh->polys,j);
+         for( int k=0; k<poly->loop_total; k++ )
+         {
+            struct cxr_loop *loop = cxr_ab_ptr(&mesh->loops,poly->loop_start+k);
+            if( loop->index == i )
+            {
+               connected_planes[num_connected ++] = j;
+               break;
+            }
+         }
+      }
+      // Check all combinations for a similar normal
+      for( int j=0; j<num_connected-1; j++ )
+      {
+         for( int k=j+1; k<num_connected; k++ )
+         {
+            struct cxr_polygon *polyj = cxr_ab_ptr(&mesh->polys,connected_planes[j]);
+            struct cxr_polygon *polyk = cxr_ab_ptr(&mesh->polys,connected_planes[k]);
+
+            if( v3_dot(polyj->normal, polyk->normal) > 0.98500 )
+               goto IL_TAG_VERT;
+         }
+      }
+
+      // Check if all connected planes not are:
+      //   - bounded by other planes
+      //   - or coplanar
+
+      for( int j=0; j<num_connected; j++ )
+         for( int k=j+1; k<num_connected; k++ )
+         {
+            struct cxr_polygon *jpoly = cxr_ab_ptr(&mesh->polys, connected_planes[j]),
+                               *kpoly = cxr_ab_ptr(&mesh->polys, connected_planes[k]);
+            v4f plane;
+            normal_to_plane( kpoly->normal, kpoly->center, plane );
+            for( int l=0; l<jpoly->loop_total; l++ )
+            {
+               struct cxr_loop *loop = cxr_ab_ptr(&mesh->loops, jpoly->loop_start+l);
+               if( plane_polarity( plane, vertices[loop->index] ) > 0.001 )
+                  goto IL_TAG_VERT;
+            }
+         }
+
+      goto IL_TAG_NEXT_VERT;
+IL_TAG_VERT: vertex_tagged[i] = 1;
+IL_TAG_NEXT_VERT:;
+   }
+
+   free( connected_planes );
+
+   // Connect all marked verts that share an edge
+   //  - We must take care not to completely isolate
+   //    a polygon with marked edges all around it
+   
+   int *hot_edge = malloc(mesh->edges.count*sizeof(int));
+   for( int i=0; i< mesh->edges.count; i++ )
+      hot_edge[i] = 0;
+
+   for( int i=0; i<mesh->polys.count; i ++ )
+   {
+      struct cxr_polygon *poly = cxr_ab_ptr(&mesh->polys,i);
+      int not_tagged = -1,
+          tag_count = 0;
+
+      for( int j=0; j<poly->loop_total; j++ )
+      {
+         struct cxr_loop *loop = cxr_ab_ptr(&mesh->loops, poly->loop_start+j);
+
+         if( !edge_tagged[ loop->edge_index ] )
+         {
+            if( not_tagged == -1 )
+               not_tagged = loop->edge_index;
+            else
+               goto IL_SKIP_NO_HOT_EDGE;
+         }
+      }
+      
+      if( not_tagged != -1 )
+         hot_edge[not_tagged]=1;
+
+      IL_SKIP_NO_HOT_EDGE:;
+   }
+
+   // Connect edges that have verts tagged, but is not a hot edge
+   for( int i=0; i<mesh->edges.count; i ++ )
+   {
+      if( hot_edge[i] && preserve_hot_edges ) continue;
+
+      struct cxr_edge *edge = cxr_ab_ptr(&mesh->edges,i);
+      if( vertex_tagged[edge->i0] && vertex_tagged[edge->i1] )
+         edge_tagged[i] = 1;
+   }
+
+   /* Debug stuff -- 
+   for( int i=0; i<vertex_count; i++ )
+      if( vertex_tagged[i] )
+         cxr_debug_box( vertices[i], 0.03, (v4f){0.0,0.0,0.0,1.0});
+
+   for( int i=0; i < mesh->edges.count; i++ )
+   {
+      struct cxr_edge *edge = cxr_ab_ptr( &mesh->edges, i );
+      if( edge_tagged[i] )
+         cxr_debug_line( vertices[ edge->i0 ], vertices[ edge->i1 ], (v4f){0.0,0.0,0.0,1.0});
+
+      if( hot_edge[i] )
+         cxr_debug_line( vertices[ edge->i0 ], vertices[ edge->i1 ], (v4f){0.0,1.0,1.0,1.0});
+   }
+   */
+
+   // count regions
+   int *faces_tagged = malloc(mesh->polys.count*sizeof(int));
+   for( int i=0; i<mesh->polys.count; i++ )
+      faces_tagged[i] = -1;
+   
+   int *solid_buffer = malloc( mesh->polys.count*sizeof(int) );
+   int solid_buffer_len = 0;
+   struct csolid
+   {
+      int start,count,edge_count;
+      v3f center;
+   }
+   *candidates = malloc( mesh->polys.count *sizeof(struct csolid) );
+   int candidate_count = 0;
+
+   for( int i=0; i<mesh->polys.count; i++ )
+   {
+      if( faces_tagged[i] != -1 ) continue;
+      faces_tagged[i] = i;
+      
+      int *solid = &solid_buffer[ solid_buffer_len ];
+      int solid_len = 0;
+      
+      solid[solid_len++] = i;
+      
+      int search_start = 0;
+      
+      // Iterative search that connects regions of planes governed by rules:
+      //   - edge can add other face if the edge has less than two reflexes
+      //   - the face can no longer be used in future searches
+
+   IL_SEARCH_CONTINUE:;
+
+      int changed = 0;
+      for( int j=search_start; j<solid_len; j++ )
+      {
+         struct cxr_polygon *poly = cxr_ab_ptr(&mesh->polys, solid[j]);
+
+         for( int k=0; k<poly->loop_total; k++ )
+         {
+            struct cxr_loop *loop = cxr_ab_ptr(&mesh->loops, poly->loop_start+k);
+            struct cxr_edge *edge = cxr_ab_ptr(&mesh->edges, loop->edge_index );
+
+            if( faces_tagged[ loop->poly_right ] == -1 )
+            {
+               if( !edge_tagged[loop->edge_index] )
+               {
+                  // Need to look ahead 1 step to make sure he does not want
+                  // to add any more planes that are coplanar with some of 
+                  // our existing group
+                  //
+                  // TODO: is this unused due to hotedge improvements? leaving for safety...
+
+                  struct cxr_polygon *poly_to_add = cxr_ab_ptr(&mesh->polys, loop->poly_right );
+                  for( int l=0; l < poly_to_add->loop_total; l++ )
+                  {
+                     struct cxr_loop *loop1 = cxr_ab_ptr(&mesh->loops, poly_to_add->loop_start+l );
+                     struct cxr_polygon *future_face = cxr_ab_ptr(&mesh->polys, loop1->poly_right );
+
+                     if( edge_tagged[ loop1->edge_index ] || loop1->poly_right == loop->poly_right ) 
+                        goto IL_SKIP_SIMILAR_PLANES;
+
+                     for( int m=0; m<solid_len; m++ )
+                        if( solid[m] == loop1->poly_right )
+                           goto IL_SKIP_SIMILAR_PLANES;
+                     
+                     for( int m=0; m<solid_len; m++ )
+                     {
+                        struct cxr_polygon *polym = cxr_ab_ptr(&mesh->polys,solid[m]);
+                        if( v3_dot( polym->normal, future_face->normal ) > 0.98500 )
+                           goto IL_SKIP_PLANE_ADD;
+                     }
+
+                     IL_SKIP_SIMILAR_PLANES:;
+                  }
+
+                  // This plane passed all checks so we can add it to the current solid
+
+                  solid[ solid_len ++ ] = loop->poly_right;
+                  faces_tagged[ loop->poly_right ] = i;
+                  changed = 1;
+               }
+
+               IL_SKIP_PLANE_ADD:;
+            }
+         }
+      }
+      search_start = solid_len;
+      if(changed) 
+         goto IL_SEARCH_CONTINUE;
+
+      // Add entry
+      struct csolid *csolid = &candidates[candidate_count ++];
+      csolid->start = solid_buffer_len;
+      csolid->count = solid_len;
+      csolid->edge_count = 0;
+      
+      v3_zero( csolid->center );
+      for( int j=0; j<solid_len; j++ )
+      {
+         struct cxr_polygon *polyj = cxr_ab_ptr(&mesh->polys, solid[j]);
+         v3_add( polyj->center, csolid->center, csolid->center );
+         csolid->edge_count += polyj->loop_total;
+      }
+      v3_divs( csolid->center, solid_len, csolid->center );
+
+      solid_buffer_len += solid_len;
+   }
+
+   // Create all candidates who have one or less non-manifolds edges
+   //   Loop each candidate, determine the manifold, and pick the best one
+
+   struct csolid *best_solid = NULL;
+   int fewest_manifold_splits = INT32_MAX;
+
+   struct cxr_loop *best_manifold = malloc( mesh->loops.count *sizeof(struct cxr_loop) );
+   int *best_manifold_splits = malloc( mesh->loops.count *sizeof(int) );
+   int best_manifold_len = 0;
+   int max_solid_faces = 0;
+
+   int *edge_list = malloc( mesh->edges.count *sizeof(int) );
+   int *edge_lefts = malloc( mesh->edges.count *sizeof(int) );
+   struct cxr_loop *manifold = malloc(mesh->edges.count*2*sizeof(struct cxr_loop));
+   int *splits = malloc(mesh->edges.count*2*sizeof(int));
+
+   for( int i=0; i<candidate_count; i++ )
+   {
+      struct csolid *solid = &candidates[i];
+      max_solid_faces = cxr_max(max_solid_faces,solid->count);
+
+      if( solid->count <= 2 )
+         continue;
+
+      int init_reverse = 0;
+      int unique_edge_count = 0;
+
+      for( int j=0; j<solid->count; j++ )
+      {
+         struct cxr_polygon *poly = cxr_ab_ptr(&mesh->polys, solid_buffer[solid->start+j]);
+
+         for( int k=0; k<poly->loop_total; k++ )
+         {
+            struct cxr_loop *loop = cxr_ab_ptr(&mesh->loops, poly->loop_start+k);
+
+            for( int l=0; l<unique_edge_count; l++ )
+               if( edge_list[l] == loop->edge_index )
+                  goto IL_EDGE_ALREADY_PRESENT;
+
+            // Check if right edge references a polygon that is not 
+            // present inside the current solid candidate
+            for( int l=0; l<solid->count; l++ )
+               if( loop->poly_right == solid_buffer[solid->start+l] )
+                  goto IL_EDGE_ALREADY_PRESENT;
+            
+            edge_list[ unique_edge_count ] = loop->edge_index;
+            edge_lefts[ unique_edge_count ] = loop->poly_left;
+
+            if( unique_edge_count == 0 )
+            {
+               struct cxr_edge *edgeptr = cxr_ab_ptr(&mesh->edges, loop->edge_index);
+               if( edgeptr->i1 == loop->index )
+                  init_reverse = 1;
+            }
+
+            unique_edge_count ++;
+            IL_EDGE_ALREADY_PRESENT:;
+         }
+      }
+      
+      // This solid is already fully connected
+      if( unique_edge_count == 0 )
+         continue;
+      
+      // Link edges together to create new manifold
+      // Corners are created when two edges share a polygon face
+      // This way we can split it into regions
+      
+      for( int j=0; j<vert_buffer->count; j++ )
+         vertex_tagged[j] = -1;
+      
+      // Start with a loop edge which was tagged
+      struct cxr_edge *current = cxr_ab_ptr(&mesh->edges, edge_list[0]);
+
+      int endpt = (!init_reverse)? current->i0: current->i1,
+          start = endpt,
+        curface = edge_lefts[0];
+
+      int manifold_len = 0;
+      int split_count = 0;
+
+      IL_MANIFOLD_CONTINUE:
+      for( int j=0; j<unique_edge_count; j++ )
+      {
+         struct cxr_edge *other = cxr_ab_ptr(&mesh->edges, edge_list[j]);
+         if( other == current )
+            continue;
+
+         if( other->i0 == endpt || other->i1 == endpt )
+         {
+            current = other;
+            int lastpt = endpt;
+
+            if( other->i0 == endpt ) endpt = current->i1;
+            else endpt = current->i0;
+            
+            if( curface==edge_lefts[j] )
+            {
+               splits[ manifold_len ] = 1;
+               split_count ++;
+            }
+            else
+               splits[ manifold_len ] = 0;
+            
+            // Append to intermidiary manifold
+            manifold[ manifold_len ].edge_index = edge_list[j];
+            manifold[ manifold_len ].poly_left = edge_lefts[j];
+            manifold[ manifold_len ].index = lastpt;
+            manifold[ manifold_len ].poly_right = 
+               polygon_edge_map[ edge_list[j]*2 ] == edge_lefts[j]?
+               polygon_edge_map[ edge_list[j]*2+1 ]:
+               polygon_edge_map[ edge_list[j]*2+0 ];
+            manifold_len ++;
+
+            curface = edge_lefts[j];
+
+            if(endpt == start) goto IL_MANIFOLD_COMPLETE;
+            goto IL_MANIFOLD_CONTINUE;
+         }
+      }
+      cxr_log( "Failed to link manifold, count: %d\n", manifold_len );
+      
+      for( int j=0; j<solid->count; j++ )
+      {
+         cxr_log( "p%d\n", solid_buffer[solid->start+j] );
+         struct cxr_polygon *poly = cxr_ab_ptr(&mesh->polys, solid_buffer[solid->start+j]);
+         cxr_debug_poly( mesh, poly, vertices, (v4f){0.2,0.0,0.0,1.0} );
+      }
+
+      for( int j=0; j<unique_edge_count; j++ )
+      {
+         struct cxr_edge *uedge = cxr_ab_ptr(&mesh->edges, edge_list[j]);
+         cxr_debug_line(vertices[uedge->i0],vertices[uedge->i1],(v4f){0.4,0.0,0.0,1.0});
+      }
+
+      for( int j=0; j<manifold_len-1; j++ )
+      {
+         struct cxr_loop *lp0 = &manifold[j],
+                         *lp1 = &manifold[cxr_range(j+1,manifold_len)];
+
+         cxr_debug_line(vertices[lp0->index],vertices[lp1->index], colour_error );
+      }
+
+      cxr_debug_mesh( mesh, vertices, (v4f){0.0,0.0,0.0, 0.9} );
+      *error = CXR_ERROR_BAD_MANIFOLD;
+
+      free(edge_list);
+      free(edge_lefts);
+      free(manifold);
+      free(splits);
+      free(edge_tagged);
+      free(vertex_tagged);
+      free(hot_edge);
+      free(faces_tagged);
+      free(solid_buffer);
+      free(candidates);
+      free(best_manifold);
+      free(best_manifold_splits);
+      free(polygon_edge_map);
+      return NULL;
+
+      IL_MANIFOLD_COMPLETE:;
+      
+      if( manifold_len < unique_edge_count )
+         continue;
+      else
+      {
+         if( split_count < fewest_manifold_splits )
+         {
+            fewest_manifold_splits = split_count;
+            best_solid = solid;
+
+            for( int j=0; j<manifold_len; j++ )
+            {
+               best_manifold[j] = manifold[j];
+               best_manifold_splits[j] = splits[j];
+            }
+            best_manifold_len = manifold_len;
+         }
+      }
+   }
+
+   free(edge_list);
+   free(edge_lefts);
+   free(manifold);
+   free(splits);
+
+   if( max_solid_faces < 2 )
+   {
+      *error = CXR_ERROR_NO_SOLIDS;
+      free(edge_tagged);
+      free(vertex_tagged);
+      free(hot_edge);
+      free(faces_tagged);
+      free(solid_buffer);
+      free(candidates);
+      free(best_manifold);
+      free(best_manifold_splits);
+      free(polygon_edge_map);
+      return NULL;
+   }
+
+   if( best_solid != NULL )
+   {
+      struct cxr_mesh *pullmesh = 
+         cxr_alloc_mesh( best_solid->edge_count, best_solid->edge_count, best_solid->count );
+      
+      // Add existing faces to pullsolid, and delete from main mesh
+      for( int i=0; i<best_solid->count; i++ )
+      {
+         int nface_id = pullmesh->polys.count;
+
+         struct cxr_polygon *exist_face = cxr_ab_ptr(&mesh->polys, solid_buffer[best_solid->start+i]);
+         struct cxr_polygon *new_face = cxr_ab_empty(&pullmesh->polys);
+         
+         *new_face = *exist_face;
+         new_face->loop_start = pullmesh->loops.count;
+
+         for( int j=0; j<exist_face->loop_total; j++ )
+         {
+            struct cxr_loop *exist_loop = cxr_ab_ptr(&mesh->loops, exist_face->loop_start+j);
+            struct cxr_loop *new_loop = cxr_ab_empty(&pullmesh->loops);
+
+            new_loop->index = exist_loop->index;
+            new_loop->poly_left = nface_id;
+            new_loop->poly_right = -1;
+            new_loop->edge_index = 0;
+            v2_copy( exist_loop->uv, new_loop->uv );
+         }
+
+         exist_face->loop_total = -1;
+      }
+
+      // Split manifold up by unique planes if it has more than 1
+      // otherwise, just use that face
+      //
+      // TODO: Need to build new manifold in sections, stably
+      //       currently there is an unsupported case where the manifold splits
+      //       are on located on an implicit face, causing 1-length manifolds.
+      
+      int new_polys = 0;
+      int pullmesh_new_start = pullmesh->polys.count;
+
+      if( fewest_manifold_splits != 0 )
+      {
+         #if CXR_MANIFOLD_DEBUG
+         for( int i=0; i<best_manifold_len; i++ )
+         {
+            int i0 = i,
+                i1 = cxr_range(i+1,best_manifold_len);
+
+            cxr_debug_line( vertices[best_manifold[i0].index], vertices[best_manifold[i1].index], colour_error );
+            if( best_manifold_splits[i] )
+               cxr_debug_box( vertices[best_manifold[i0].index], 0.04, colour_success );
+         }
+         #endif
+         
+         // This is a really strange observation, however it *seems* to apply to the kinds
+         // of geometry we are dealing with. If the split count is odd, the manifold can be
+         // created easily, no folding required.
+         //
+         // When it is even, it appears that internal implicit geometry is required, so we
+         // need to fold the loops we create. Its really weird, but for some reason works on 
+         // the geometry rules we've defined.
+         //   TODO: Find a well defined rule here.
+
+         int collapse_used_segments = (u32)fewest_manifold_splits & 0x1? 0: 1;
+
+         IL_MANIFOLD_BUILD_REPEAT:
+         
+         for( int j=0; j<best_manifold_len; j++ )
+         {
+            if( best_manifold_splits[j] )
+            {
+               struct cxr_loop *loop = &best_manifold[j];
+
+               for( int k=1; k<best_manifold_len; k++ )
+               {
+                  int index1 = cxr_range(j+k,best_manifold_len);
+                  struct cxr_loop *loop1 = &best_manifold[index1];
+
+                  if( best_manifold_splits[index1] )
+                  {
+                     if( k==1 )
+                        break;
+
+                     new_polys ++;
+
+                     if( new_polys > best_manifold_len )
+                     {
+                        cxr_log( "Programming error: Too many new polys!\n" );
+                        exit(1);
+                     }
+
+                     cxr_create_poly( pullmesh, vertices, best_manifold, k+1, j, best_manifold_len );
+
+                     // Remove new section from manifold
+                     if( collapse_used_segments )
+                     {
+                        best_manifold_splits[j] = 0;
+                        best_manifold_splits[index1] = 0;
+
+                        int new_length = (best_manifold_len-(k-1));
+
+                        struct cxr_loop *new_manifold = malloc( new_length*sizeof(struct cxr_loop) );
+                        int *new_manifold_splits = malloc( new_length*sizeof(int) );
+
+                        for( int l=0; l<new_length; l ++ )
+                        {
+                           int i_src = cxr_range( j+k+l, best_manifold_len );
+                           new_manifold[l] = best_manifold[i_src];
+                           new_manifold_splits[l] = best_manifold_splits[i_src];
+                        }
+
+                        free( best_manifold );
+                        free( best_manifold_splits );
+                        best_manifold = new_manifold;
+                        best_manifold_splits = new_manifold_splits;
+
+                        best_manifold_len = new_length;
+
+                        goto IL_MANIFOLD_BUILD_REPEAT;
+                     }
+
+                     j=j+k-1;
+                     break;
+                  }
+               }
+            }
+         }
+         
+         if( best_manifold_len && collapse_used_segments )
+         {
+            cxr_create_poly( pullmesh, vertices, best_manifold, best_manifold_len, 0, best_manifold_len );
+            new_polys ++;
+         }
+      }
+      else
+      {
+         cxr_create_poly( pullmesh, vertices, best_manifold, best_manifold_len, 0, best_manifold_len );
+         new_polys = 1;
+      }
+
+      // vert_buffer may be reallocated by the next section of code,
+      //             force a NULLref on vertices to catch any errors
+      vertices = NULL;
+
+      // Implicit geometry reconstruction
+      //   If there's 3 or more planes, collide them together to see if any new
+      //   vertices need to be created on the mesh
+      if( new_polys >= 3 )
+      {
+         for( int i=0; i<new_polys-2; i++ )
+         {
+            for( int j=i+1; j<new_polys-1; j++ )
+            {
+               for( int k=j+1; k<new_polys; k++ )
+               {
+                  struct cxr_polygon *ptri = cxr_ab_ptr( &pullmesh->polys, pullmesh_new_start+i ),
+                                     *ptrj = cxr_ab_ptr( &pullmesh->polys, pullmesh_new_start+j ),
+                                     *ptrk = cxr_ab_ptr( &pullmesh->polys, pullmesh_new_start+k );
+
+                  v4f planei, planej, planek;
+                  normal_to_plane(ptri->normal,ptri->center,planei);
+                  normal_to_plane(ptrj->normal,ptrj->center,planej);
+                  normal_to_plane(ptrk->normal,ptrk->center,planek);
+                  
+                  v3f intersect;
+
+                  if( plane_intersect(planei,planej,planek,intersect) )
+                  {
+                     // cxr_debug_box( intersect, 0.05, colour_error );
+
+                     // Make sure this point is within the convex region, otherwise treat
+                     // it as a degenerate case
+                     
+                     int point_valid = 1;
+                     for( int l=0; l<pullmesh->polys.count; l++ )
+                     {
+                        struct cxr_polygon *ptrl = cxr_ab_ptr(&pullmesh->polys,l);
+                        v4f planel;
+
+                        normal_to_plane(ptrl->normal, ptrl->center, planel);
+
+                        if( plane_polarity( planel, intersect ) > 0.01 )
+                        {
+                           cxr_log( "degen vert, planes %d, %d, %d [max:%d]\n", i,j,k, new_polys );
+                           *error = CXR_ERROR_DEGEN_IMPLICIT;
+
+                           cxr_debug_poly( pullmesh, ptri, cxr_ab_ptr(vert_buffer,0), colours_random[3] );
+                           cxr_debug_poly( pullmesh, ptrj, cxr_ab_ptr(vert_buffer,0), colours_random[1] );
+                           cxr_debug_poly( pullmesh, ptrk, cxr_ab_ptr(vert_buffer,0), colours_random[2] );
+
+                           point_valid = 0;
+                           break;
+                        }
+                     }
+                     
+                     if( !point_valid ) continue;
+
+                     // Extend faces to include this point
+                     int nvertid = vert_buffer->count;
+                     cxr_ab_push( vert_buffer, intersect );
+   
+                     ptrj->loop_start += 1;
+                     ptrk->loop_start += 2;
+                     
+                     cxr_ab_reserve(&pullmesh->loops, 3);
+                     struct cxr_loop *lloopi = cxr_ab_empty_at(&pullmesh->loops, ptri->loop_start+ptri->loop_total),
+                                     *lloopj = cxr_ab_empty_at(&pullmesh->loops, ptrj->loop_start+ptrj->loop_total),
+                                     *lloopk = cxr_ab_empty_at(&pullmesh->loops, ptrk->loop_start+ptrk->loop_total);
+                     
+                     lloopi->index = nvertid;
+                     lloopj->index = nvertid;
+                     lloopk->index = nvertid;
+                     lloopi->edge_index = 0; lloopj->edge_index = 0; lloopk->edge_index = 0;
+                     lloopi->poly_left = pullmesh_new_start+i;
+                     lloopj->poly_left = pullmesh_new_start+j;
+                     lloopk->poly_left = pullmesh_new_start+k;
+                     lloopi->poly_right = -1; lloopj->poly_right = -1; lloopk->poly_right = -1;
+                     
+                     v2_zero(lloopi->uv);
+                     v2_zero(lloopj->uv);
+                     v2_zero(lloopk->uv);
+
+                     ptri->loop_total ++;
+                     ptrj->loop_total ++;
+                     ptrk->loop_total ++;
+
+                     // Adjust centers of faces
+                     v3_lerp( ptri->center, intersect, 1.0/(double)ptri->loop_total, ptri->center );
+                     v3_lerp( ptrj->center, intersect, 1.0/(double)ptrj->loop_total, ptrj->center );
+                     v3_lerp( ptrk->center, intersect, 1.0/(double)ptrk->loop_total, ptrk->center );
+                  }
+               }
+            }
+         }
+      }
+
+      // Copy faces from pullsolid into orig mesh
+
+      for( int i=0; i<new_polys; i++ )
+      {
+         int rface_id = mesh->polys.count;
+
+         struct cxr_polygon *pface = cxr_ab_ptr(&pullmesh->polys,pullmesh_new_start+i);
+         struct cxr_polygon *rip_face = cxr_ab_empty(&mesh->polys);
+
+         rip_face->loop_start = mesh->loops.count;
+         rip_face->loop_total = pface->loop_total;
+         rip_face->material_id = -1;
+         
+         for( int j=0; j<rip_face->loop_total; j++ )
+         {
+            struct cxr_loop *ploop = cxr_ab_ptr(&pullmesh->loops, pface->loop_start+pface->loop_total-j-1),
+                            *rloop = cxr_ab_empty(&mesh->loops);
+
+            rloop->index = ploop->index;
+            rloop->poly_left = rface_id;
+            rloop->poly_right = -1;
+            rloop->edge_index = 0;
+            v2_copy( ploop->uv, rloop->uv );
+         }
+
+         v3_copy( pface->center, rip_face->center );
+         v3_negate( pface->normal, rip_face->normal );
+      }
+
+      cxr_mesh_clean_faces( mesh );
+      cxr_mesh_clean_faces( pullmesh );
+      cxr_mesh_clean_edges( mesh );
+      cxr_mesh_clean_edges( pullmesh );
+
+      free(edge_tagged);
+      free(vertex_tagged);
+      free(hot_edge);
+      free(faces_tagged);
+      free(solid_buffer);
+      free(candidates);
+      free(best_manifold);
+      free(best_manifold_splits);
+      free(polygon_edge_map);
+   
+      return pullmesh;
+   }
+
+   free(edge_tagged);
+   free(vertex_tagged);
+   free(hot_edge);
+   free(faces_tagged);
+   free(solid_buffer);
+   free(candidates);
+   free(best_manifold);
+   free(best_manifold_splits);
+   free(polygon_edge_map);
+
+   return NULL;
+}
+
+static struct cxr_mesh *cxr_to_internal_format(struct cxr_input_mesh *src, struct cxr_auto_buffer *abverts)
+{
+   // Split mesh into islands
+   struct cxr_mesh *mesh = cxr_alloc_mesh( src->edge_count, src->loop_count, src->poly_count );
+   cxr_ab_init( abverts, sizeof(v3f), src->vertex_count );
+
+   // Copy input data into working mesh
+   memcpy( cxr_ab_ptr( &mesh->edges, 0 ), src->edges, src->edge_count*sizeof(struct cxr_edge));
+   memcpy( cxr_ab_ptr( &mesh->polys, 0 ), src->polys, src->poly_count*sizeof(struct cxr_polygon));
+   memcpy( cxr_ab_ptr( abverts, 0 ), src->vertices, src->vertex_count*sizeof(v3f));
+   mesh->edges.count = src->edge_count;
+   mesh->loops.count = src->loop_count;
+   mesh->polys.count = src->poly_count;
+
+   for( int i=0; i<src->loop_count; i++ )
+   {
+      struct cxr_loop *lp = cxr_ab_ptr(&mesh->loops,i);
+      lp->index = src->loops[i].index;
+      lp->edge_index = src->loops[i].edge_index;
+      v2_copy( src->loops[i].uv, lp->uv );
+   }
+
+   abverts->count = src->vertex_count;
+
+   return mesh;
+}
+
+// Find farthest dot product along direction
+static double support_distance( v3f verts[3], v3f dir, double coef )
+{
+   return cxr_maxf
+   ( 
+      coef * v3_dot( verts[0], dir ), 
+      cxr_maxf
+      (
+         coef * v3_dot( verts[1], dir ),
+         coef * v3_dot( verts[2], dir )
+      )
+   );
+}
+
+// Main function
+static void cxr_calculate_axis( 
+   struct cxr_texinfo *transform,
+   v3f verts[3],
+   v2f uvs[3],
+   v2f texture_res
+   )
+{
+   v2f tT, bT; // Tangent/bitangent pairs for UV space and world
+   v3f tW, bW;
+
+   v2_sub( uvs[0], uvs[1], tT );
+   v2_sub( uvs[2], uvs[1], bT );
+   v3_sub( verts[0], verts[1], tW );
+   v3_sub( verts[2], verts[1], bW );
+
+   // Use arbitrary projection if there is no UV 
+   if( v2_length( tT ) < 0.0001 || v2_length( bT ) < 0.0001 )
+   {
+      v3f uaxis, normal, vaxis;
+
+      v3_copy( tW, uaxis );
+      v3_normalize( uaxis );
+
+      v3_cross( tW, bW, normal );
+      v3_cross( normal, uaxis, vaxis );
+      v3_normalize( vaxis );
+
+      v3_copy( uaxis, transform->uaxis );
+      v3_copy( vaxis, transform->vaxis );
+      v2_zero( transform->offset );
+
+      v2_div( (v2f){128.0, 128.0}, texture_res, transform->scale );
+      return;
+   }
+   
+   // Detect if UV is reversed
+   double winding = v2_cross( tT, bT ) >= 0.0f? 1.0f: -1.0f;
+
+   // UV projection reference
+   v2f vY, vX;
+   v2_muls((v2f){1,0}, winding, vX);
+   v2_muls((v2f){0,1}, winding, vY);
+
+   // Reproject reference into world space, including skew
+   v3f uaxis1, vaxis1;
+
+   v3_muls( tW, v2_cross(vX,bT) / v2_cross(bT,tT), uaxis1 );
+   v3_muladds( uaxis1, bW, v2_cross(vX, tT) / v2_cross(tT,bT), uaxis1 );
+
+   v3_muls( tW, v2_cross(vY,bT) / v2_cross(bT,tT), vaxis1 );
+   v3_muladds( vaxis1, bW, v2_cross(vY,tT) / v2_cross(tT,bT), vaxis1 );
+
+   v3_normalize( uaxis1 );
+   v3_normalize( vaxis1 );
+
+   // Apply source transform to axis (yes, they also need to be swapped)
+   v3f norm, uaxis, vaxis;
+
+   v3_cross( bW, tW, norm );
+   v3_normalize(norm);
+   v3_cross( vaxis1, norm, uaxis );
+   v3_cross( uaxis1, norm, vaxis );
+
+   // real UV scale
+   v2f uvmin, uvmax, uvdelta;
+   v2_minv( uvs[0], uvs[1], uvmin );
+   v2_minv( uvmin, uvs[2], uvmin );
+   v2_maxv( uvs[0], uvs[1], uvmax );
+   v2_maxv( uvmax, uvs[2], uvmax );
+   
+   v2_sub( uvmax, uvmin, uvdelta );
+
+   // world-uv scale
+   v2f uvminw, uvmaxw, uvdeltaw;
+   uvminw[0] = -support_distance( verts, uaxis, -1.0f );
+   uvmaxw[0] =  support_distance( verts, uaxis,  1.0f );
+   uvminw[1] = -support_distance( verts, vaxis, -1.0f );
+   uvmaxw[1] =  support_distance( verts, vaxis,  1.0f );
+
+   v2_sub( uvmaxw, uvminw, uvdeltaw );
+   
+   // VMf uv scale
+   v2f uv_scale;
+   v2_div( uvdeltaw, uvdelta, uv_scale );
+   v2_div( uv_scale, texture_res, uv_scale );
+
+   // Find offset via 'natural' point
+   v2f target_uv, natural_uv, tex_offset;
+   v2_mul( uvs[0], texture_res, target_uv );
+   
+   natural_uv[0] =  v3_dot( uaxis, verts[0] );
+   natural_uv[1] = -v3_dot( vaxis, verts[0] );
+   v2_div( natural_uv, uv_scale, natural_uv );
+
+   tex_offset[0] =   target_uv[0]-natural_uv[0];
+   tex_offset[1] = -(target_uv[1]-natural_uv[1]);
+
+   // Copy everything into output
+   v3_copy( uaxis, transform->uaxis );
+   v3_copy( vaxis, transform->vaxis );
+   v2_copy( tex_offset, transform->offset );
+   v2_copy( uv_scale, transform->scale );
+}
+
+CXR_API struct cxr_input_mesh *cxr_decompose(struct cxr_input_mesh *src)
+{
+#ifdef CXR_DEBUG_WRITE_MESH
+   FILE *yeet = fopen( "/home/harry/Documents/blender_addons_remote/addons/convexer/solid.h", "w" );
+
+   fprintf( yeet, "v3f test_verts[] = {\n" );
+   for( int i=0; i<src->vertex_count; i ++ )
+   {
+      fprintf( yeet, "   { %f, %f, %f },\n",
+            src->vertices[i][0],
+            src->vertices[i][1],
+            src->vertices[i][2] );
+   }
+   fprintf( yeet, "};\n" );
+
+   fprintf( yeet, "struct cxr_input_loop test_loops[] = {\n" );
+   for( int i=0; i<src->loop_count; i ++ )
+   {
+      fprintf( yeet, "   {%d, %d},\n",
+         src->loops[i].index,
+         src->loops[i].edge_index);
+   }
+   fprintf( yeet, "};\n" );
+
+   fprintf( yeet, "struct cxr_polygon test_polys[] = {\n" );
+   for( int i=0; i <src->poly_count; i++ )
+   {
+      fprintf( yeet, "   {%d, %d, {%f, %f, %f}, {%f, %f, %f}},\n",
+         src->polys[i].loop_start,
+         src->polys[i].loop_total,
+         src->polys[i].normal[0],
+         src->polys[i].normal[1],
+         src->polys[i].normal[2],
+         src->polys[i].center[0],
+         src->polys[i].center[1],
+         src->polys[i].center[2] );
+   }
+   fprintf( yeet, "};\n" );
+
+   fprintf( yeet, "struct cxr_edge test_edges[] = {\n" );
+   for( int i=0; i<src->edge_count; i++ )
+   {
+      fprintf( yeet, "   {%d, %d},\n",
+         src->edges[i].i0,
+         src->edges[i].i1
+      );
+   }
+   fprintf( yeet, "};\n" );
+
+   fprintf( yeet, "struct cxr_input_mesh test_mesh = {\n" );
+   fprintf( yeet, "   .vertices = test_verts,\n" );
+   fprintf( yeet, "   .loops = test_loops,\n" );
+   fprintf( yeet, "   .edges = test_edges,\n" );
+   fprintf( yeet, "   .polys = test_polys,\n" );
+   fprintf( yeet, "   .poly_count=%d,\n", src->poly_count );
+   fprintf( yeet, "   .vertex_count=%d,\n", src->vertex_count );
+   fprintf( yeet, "   .edge_count=%d,\n",src->edge_count );
+   fprintf( yeet, "   .loop_count=%d\n", src->loop_count );
+   fprintf( yeet, "};\n" );
+
+   fclose( yeet );
+#endif
+
+   struct cxr_auto_buffer abverts;
+   struct cxr_mesh *main_mesh = cxr_to_internal_format( src, &abverts );
+
+   u32 error = 0x00;
+
+   struct cxr_auto_buffer solids;
+   cxr_ab_init( &solids, sizeof(struct cxr_mesh *), 2 );
+
+   // TODO: Preprocessor stages
+   //  - Split mesh up into islands before doing anything here
+   //  - Snap vertices to grid (0.25u) ?
+   while(1)
+   {
+      struct cxr_mesh *res = cxr_pull_best_solid( main_mesh, &abverts, 0, &error );
+      if( res )
+      {
+         cxr_ab_push( &solids, &res );
+         if( error ) break;
+      }
+      else
+      {
+         if( error )
+         {
+            // If no solids error we can rety while preserving 'hot' edges
+
+            if( error & CXR_ERROR_NO_SOLIDS )
+            {
+               error = 0x00;
+               res = cxr_pull_best_solid(main_mesh, &abverts, 1, &error);
+
+               if( res ) cxr_ab_push( &solids, &res );
+               else break;
+
+               if( error ) break;
+            }
+            else break;
+         }
+         else 
+            break;
+      }
+   }
+
+   cxr_ab_push( &solids, &main_mesh );
+
+   if( !error )
+   {
+      for( int i=0; i<solids.count; i++ )
+      {
+         struct cxr_mesh **mptr = cxr_ab_ptr(&solids,i);
+         cxr_debug_mesh( *mptr, cxr_ab_ptr(&abverts,0), colours_random[cxr_range(i,8)] );
+      }
+   }
+
+   for( int i=0; i<solids.count; i++ )
+   {
+      struct cxr_mesh **mptr = cxr_ab_ptr(&solids,i);
+      cxr_free_mesh( *mptr );
+   }
+
+   cxr_ab_free( &abverts );
+   cxr_ab_free( &solids );
+
+   return NULL;
+}
+
+CXR_API i32 cxr_convert_mesh_to_vmf(struct cxr_input_mesh *src, struct cxr_vdf *output)
+{
+   // Split mesh into islands
+   struct cxr_auto_buffer abverts;
+   struct cxr_mesh *main_mesh = cxr_to_internal_format(src, &abverts);
+
+   u32 error = 0x00;
+
+   struct solidinf
+   {
+      struct cxr_mesh *pmesh;
+      int is_displacement;
+   };
+
+   struct cxr_auto_buffer solids;
+   cxr_ab_init( &solids, sizeof(struct solidinf), 2 );
+
+   // TODO: Preprocessor stages
+   //  - Split mesh up into islands before doing anything here    (DONE)
+   //  - Snap vertices to grid (0.25u)                            ?
+   
+   // Preprocessor 1: Island seperation
+   //  ---------------
+
+   while(1)
+   {
+      struct cxr_mesh *res = cxr_pull_island( main_mesh );
+      if( res )
+      {
+         cxr_ab_push( &solids, &(struct solidinf){ res, 0 });
+      }
+      else break;
+   }
+   cxr_ab_push( &solids, &(struct solidinf){main_mesh,0} );
+   
+   // Preprocessor 2: Displacement break-out
+   //  ---------------
+
+   // Preprocessor 3: Breakup non-convex shapes into sub-solids
+   //  ---------------
+   int sources_count = solids.count;
+   
+   for( int i=0; i<sources_count; i++ )
+   {
+      struct solidinf pinf = *(struct solidinf *)cxr_ab_ptr(&solids, i);
+
+      if( pinf.is_displacement )
+         // TODO: write displacements here... 
+         continue;
+
+      while(1)
+      {
+         struct cxr_mesh *res = cxr_pull_best_solid( pinf.pmesh, &abverts, 0, &error );
+
+         if( res )
+         {
+            cxr_ab_push( &solids, &(struct solidinf){res,0} );
+            if( error )
+               break;
+         }
+         else
+         {
+            if( error )
+            {
+               // If no solids error we can rety while preserving 'hot' edges
+
+               if( error & CXR_ERROR_NO_SOLIDS )
+               {
+                  error = 0x00;
+                  res = cxr_pull_best_solid(pinf.pmesh, &abverts, 1, &error);
+
+                  if( res ) cxr_ab_push( &solids, &(struct solidinf){res,0} );
+                  else break;
+
+                  if( error ) break;
+               }
+            }
+            else 
+               break;
+         }
+      }
+   }
+   
+   if( cxr_settings.debug )
+   {
+      for( int i=0; i<solids.count; i++ )
+      {
+         struct solidinf *solid = cxr_ab_ptr(&solids,i);
+         cxr_debug_mesh( solid->pmesh, cxr_ab_ptr(&abverts,0), colours_random[cxr_range(i,8)] );
+      }
+   }
+
+   // Turn all those solids into VMF brushes
+   // --------------------------------------
+   for( int i=0; i<solids.count; i++ )
+   {
+      struct solidinf *solid = cxr_ab_ptr(&solids,i);
+
+      if( solid->is_displacement ) continue;
+
+      cxr_vdf_node( output, "solid" );
+      cxr_vdf_ki32( output, "id", ++ cxr_context.brush_count ); 
+      
+      for( int j=0; j<solid->pmesh->polys.count; j++ )
+      {
+         struct cxr_polygon *poly = cxr_ab_ptr( &solid->pmesh->polys, j );
+         struct cxr_loop *ploops = cxr_ab_ptr(&solid->pmesh->loops, poly->loop_start);
+         struct cxr_material *matptr = 
+            poly->material_id < 0 || src->material_count == 0? 
+               &cxr_nodraw:
+               &src->materials[ poly->material_id ];
+
+         cxr_vdf_node( output, "side" );
+         cxr_vdf_ki32( output, "id", ++ cxr_context.face_count );
+
+         v3f verts[3]; v2f uvs[3];
+
+         v3_muls( cxr_ab_ptr(&abverts, ploops[0].index), cxr_context.scale_factor, verts[0] );
+         v3_muls( cxr_ab_ptr(&abverts, ploops[1].index), cxr_context.scale_factor, verts[1] );
+         v3_muls( cxr_ab_ptr(&abverts, ploops[2].index), cxr_context.scale_factor, verts[2] );
+         verts[0][2] += cxr_context.offset_z;
+         verts[1][2] += cxr_context.offset_z;
+         verts[2][2] += cxr_context.offset_z;
+
+         v2_copy( ploops[0].uv, uvs[0] );
+         v2_copy( ploops[1].uv, uvs[1] );
+         v2_copy( ploops[2].uv, uvs[2] );
+
+         cxr_vdf_plane( output, "plane", verts[2], verts[1], verts[0] );
+         cxr_vdf_kv( output, "material", matptr->vmt_path );
+         
+         struct cxr_texinfo trans;
+         cxr_calculate_axis(&trans, verts, uvs, (double[2]){ matptr->res[0], matptr->res[1] });
+
+         cxr_vdf_kaxis(output, "uaxis", trans.uaxis, trans.offset[0], trans.scale[0]);
+         cxr_vdf_kaxis(output, "vaxis", trans.vaxis, trans.offset[1], trans.scale[1]);
+
+         cxr_vdf_kdouble(output, "rotation", 0.0 );
+         cxr_vdf_ki32(output, "lightmapscale", cxr_settings.lightmap_scale );
+         cxr_vdf_ki32(output, "smoothing_groups", 0);
+
+         cxr_vdf_edon( output );
+      }
+
+      cxr_vdf_node(output, "editor");
+      cxr_vdf_colour255(output,"color", colours_random[cxr_range(cxr_context.brush_count,8)]);
+      cxr_vdf_ki32(output,"visgroupshown",1);
+      cxr_vdf_ki32(output,"visgroupautoshown",1);
+      cxr_vdf_edon(output);
+
+      cxr_vdf_edon( output );
+   }
+   
+   for( int i=0; i<solids.count; i++ )
+   {
+      struct solidinf *solid = cxr_ab_ptr(&solids,i);
+      cxr_free_mesh( solid->pmesh );
+   }
+
+   cxr_ab_free( &abverts );
+   cxr_ab_free( &solids );
+   return 0;
+}
+
+
+CXR_API void cxr_set_log_function( void (*func)(const char *str) )
+{
+   cxr_log_func = func;
+}
+
+CXR_API void cxr_set_line_function( void (*func)(v3f p0, v3f p1, v4f colour) )
+{
+   cxr_line_func = func;
+}
+
+CXR_API void cxr_settings_update( struct cxr_settings *settings )
+{
+   cxr_settings = *settings;
+}
+
+// Valve copyright stuff probably maybe
+//  whatever, my previous copyright decleration ends here
+// ----------------------------------------------------------
+
+#define        HEADER_LUMPS            64
+#define  LUMP_WORLDLIGHTS  54
+
+#pragma pack(push,1)
+
+struct header
+{
+   int       ident;
+   int       version;
+
+   struct lump 
+   {
+      int fileofs, filelen;
+      int version;
+
+      char fourCC[4];
+   }
+   lumps[ HEADER_LUMPS ];
+
+   int       mapRevision;
+};
+
+struct worldlight
+{
+       float              origin[3];
+       float              intensity[3];
+       float              normal[3];
+       float              shadow_cast_offset[3];
+       int                     cluster;
+       int         type;
+   int                 style;
+       float              stopdot;
+       float              stopdot2;
+       float           exponent;
+       float           radius;
+       float              constant_attn;       
+       float              linear_attn;
+       float              quadratic_attn;
+       int                     flags;
+       int                     texinfo;        
+       int                     owner;
+};
+#pragma pack(pop)
+
+// Utility for patching BSP tools to remove -1 distance lights (we set them
+//  like that, because we want these lights to go away)
+//
+//  Yes, there is no way to do this in hammer
+//  Yes, the distance KV is unused but still gets compiled to this lump
+//  No, Entities only compile will not do this for you
+//
+CXR_API int cxr_lightpatch_bsp( const char *path )
+{
+   printf( "Lightpatch: %s\n", path );
+
+   FILE *fp = fopen( path, "r+b" );
+
+   if( !fp )
+   {
+      cxr_log( "Could not open BSP file for editing (r+b)\n" );
+      return 0;
+   }
+
+   // Read bsp
+   struct header header;
+   fread( &header, sizeof(struct header), 1, fp );
+   struct lump *lump = &header.lumps[ LUMP_WORLDLIGHTS ];
+
+   // Read worldlight array
+   struct worldlight *lights = malloc( lump->filelen );
+   fseek( fp, lump->fileofs, SEEK_SET );
+   fread( lights, lump->filelen, 1, fp );
+
+   // Remove all marked lights
+   int light_count = lump->filelen / sizeof(struct worldlight);
+   int new_count = 0;
+
+   for( int i = 0; i < light_count; i ++ )
+      if( lights[i].radius >= 0.0f )
+         lights[new_count++] = lights[i];
+   
+   lump->filelen = new_count*sizeof(struct worldlight);
+
+   // Write changes
+   fseek( fp, lump->fileofs, SEEK_SET );
+   fwrite( lights, lump->filelen, 1, fp );
+   fseek( fp, 0, SEEK_SET );
+   fwrite( &header, sizeof(struct header), 1, fp );
+   cxr_log( "removed %d marked lights\n", light_count-new_count );
+
+   fclose( fp );
+   free( lights );
+
+   return 1;
+}

diff --git a/src/cxr_math.h b/src/cxr_math.h
new file mode 100644 (file)
index 0000000..5f1bfc2
--- /dev/null
+++ b/src/cxr_math.h
@@ -0,0 +1,573 @@
+// Copyright (C) 2021 Harry Godden (hgn)
+
+#define CXR_INLINE static inline
+#define CXR_PIf 3.14159265358979323846264338327950288f
+
+// Simple min/max replacements
+CXR_INLINE double cxr_minf( double a, double b )
+{
+       return a < b? a: b;
+}
+
+CXR_INLINE double cxr_maxf( double a, double b )
+{
+       return a > b? a: b;
+}
+
+CXR_INLINE int cxr_min( int a, int b )
+{
+       return a < b? a: b;
+}
+
+CXR_INLINE int cxr_max( int a, int b )
+{
+       return a > b? a: b;
+}
+
+// Convert degrees to radians
+CXR_INLINE double cxr_rad( double deg )
+{
+       return deg * CXR_PIf / 180.0f;
+}
+
+// Vector 2
+// ==================================================================================================================
+
+CXR_INLINE void v2_zero( v2f a )
+{
+   a[0] = 0.0; a[1] = 0.0;
+}
+
+CXR_INLINE void v2_copy( v2f a, v2f b )
+{
+       b[0] = a[0]; b[1] = a[1];
+}
+
+CXR_INLINE void v2_minv( v2f a, v2f b, v2f dest ) 
+{
+       dest[0] = cxr_minf(a[0], b[0]);
+       dest[1] = cxr_minf(a[1], b[1]);
+}
+
+CXR_INLINE void v2_maxv( v2f a, v2f b, v2f dest ) 
+{
+       dest[0] = cxr_maxf(a[0], b[0]);
+       dest[1] = cxr_maxf(a[1], b[1]);
+}
+
+CXR_INLINE void v2_sub( v2f a, v2f b, v2f d )
+{
+       d[0] = a[0]-b[0]; d[1] = a[1]-b[1];
+}
+
+CXR_INLINE double v2_cross( v2f a, v2f b )
+{
+       return a[0] * b[1] - a[1] * b[0];
+}
+
+CXR_INLINE void v2_add( v2f a, v2f b, v2f d )
+{
+       d[0] = a[0]+b[0]; d[1] = a[1]+b[1];
+}
+
+CXR_INLINE void v2_muls( v2f a, double s, v2f d )
+{
+       d[0] = a[0]*s; d[1] = a[1]*s;
+}
+
+CXR_INLINE void v2_mul( v2f a, v2f b, v2f d )
+{
+       d[0] = a[0]*b[0]; d[1] = a[1]*b[1];
+}
+
+CXR_INLINE void v2_muladds( v2f a, v2f b, double s, v2f d )
+{
+       d[0] = a[0]+b[0]*s; d[1] = a[1]+b[1]*s;
+}
+
+CXR_INLINE double v2_dot( v2f a, v2f b )
+{
+       return a[0] * b[0] + a[1] * b[1];
+}
+
+CXR_INLINE void v2_div( v2f a, v2f b, v2f d )
+{
+       d[0] = a[0]/b[0]; d[1] = a[1]/b[1];
+}
+
+CXR_INLINE double v2_length2( v2f a )
+{
+       return v2_dot( a, a );
+}
+
+CXR_INLINE double v2_length( v2f a )
+{
+       return sqrt( v2_length2( a ) );
+}
+
+CXR_INLINE double v2_dist2( v2f a, v2f b )
+{
+       v2f delta;
+       v2_sub( a, b, delta );
+       return v2_length2( delta );
+}
+
+CXR_INLINE double v2_dist( v2f a, v2f b )
+{
+       return sqrt( v2_dist2( a, b ) );
+}
+
+CXR_INLINE void v2_normalize( v2f a )
+{
+       v2_muls( a, 1.0 / v2_length( a ), a );
+}
+
+// Vector 3
+// ==================================================================================================================
+
+CXR_INLINE void v3_zero( v3f a )
+{
+       a[0] = 0.f; a[1] = 0.f; a[2] = 0.f;
+}
+
+CXR_INLINE void v3_copy( v3f a, v3f b )
+{
+       b[0] = a[0]; b[1] = a[1]; b[2] = a[2];
+}
+
+CXR_INLINE void v3_add( v3f a, v3f b, v3f d )
+{
+       d[0] = a[0]+b[0]; d[1] = a[1]+b[1]; d[2] = a[2]+b[2];
+}
+
+CXR_INLINE void v3_sub( v3f a, v3f b, v3f d )
+{
+       d[0] = a[0]-b[0]; d[1] = a[1]-b[1]; d[2] = a[2]-b[2];
+}
+
+CXR_INLINE void v3_mul( v3f a, v3f b, v3f d )
+{
+       d[0] = a[0]*b[0]; d[1] = a[1]*b[1]; d[2] = a[2]*b[2];
+}
+
+CXR_INLINE void v3_div( v3f a, v3f b, v3f d )
+{
+       d[0] = a[0]/b[0]; d[1] = a[1]/b[1];     d[2] = a[2]/b[2];
+}
+
+CXR_INLINE void v3_muls( v3f a, double s, v3f d )
+{
+       d[0] = a[0]*s; d[1] = a[1]*s; d[2] = a[2]*s;
+}
+
+CXR_INLINE void v3_divs( v3f a, double s, v3f d )
+{
+       d[0] = a[0]/s; d[1] = a[1]/s; d[2] = a[2]/s;
+}
+
+CXR_INLINE void v3_muladds( v3f a, v3f b, double s, v3f d )
+{
+       d[0] = a[0]+b[0]*s; d[1] = a[1]+b[1]*s; d[2] = a[2]+b[2]*s;
+}
+
+CXR_INLINE double v3_dot( v3f a, v3f b )
+{
+       return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
+}
+
+CXR_INLINE void v3_cross( v3f a, v3f b, v3f d )
+{
+  d[0] = a[1] * b[2] - a[2] * b[1];
+  d[1] = a[2] * b[0] - a[0] * b[2];
+  d[2] = a[0] * b[1] - a[1] * b[0];
+}
+
+CXR_INLINE double v3_length2( v3f a )
+{
+       return v3_dot( a, a );
+}
+
+CXR_INLINE double v3_length( v3f a )
+{
+       return sqrt( v3_length2( a ) );
+}
+
+CXR_INLINE double v3_dist2( v3f a, v3f b )
+{
+       v3f delta;
+       v3_sub( a, b, delta );
+       return v3_length2( delta );
+}
+
+CXR_INLINE double v3_dist( v3f a, v3f b )
+{
+       return sqrt( v3_dist2( a, b ) );
+}
+
+CXR_INLINE void v3_normalize( v3f a )
+{
+       v3_muls( a, 1.0 / v3_length( a ), a );
+}
+
+CXR_INLINE void v3_negate( v3f a, v3f dest )
+{
+   v3_muls( a, -1.0, dest );
+}
+
+CXR_INLINE double cxr_lerpf( double a, double b, double t )
+{
+       return a + t*(b-a);
+}
+
+CXR_INLINE void v3_lerp( v3f a, v3f b, double t, v3f d )
+{
+       d[0] = a[0] + t*(b[0]-a[0]);
+       d[1] = a[1] + t*(b[1]-a[1]);
+       d[2] = a[2] + t*(b[2]-a[2]);
+}
+
+CXR_INLINE void v3_minv( v3f a, v3f b, v3f dest ) 
+{
+       dest[0] = cxr_minf(a[0], b[0]);
+       dest[1] = cxr_minf(a[1], b[1]);
+       dest[2] = cxr_minf(a[2], b[2]);
+}
+
+CXR_INLINE void v3_maxv( v3f a, v3f b, v3f dest ) 
+{
+       dest[0] = cxr_maxf(a[0], b[0]);
+       dest[1] = cxr_maxf(a[1], b[1]);
+       dest[2] = cxr_maxf(a[2], b[2]);
+}
+
+CXR_INLINE double v3_minf( v3f a )
+{
+       return cxr_minf( cxr_minf( a[0], a[1] ), a[2] );
+}
+
+CXR_INLINE double v3_maxf( v3f a )
+{
+       return cxr_maxf( cxr_maxf( a[0], a[1] ), a[2] );
+}
+
+CXR_INLINE void v3_fill( v3f a, double v )
+{
+       a[0] = v;
+       a[1] = v;
+       a[2] = v;
+}
+
+// Vector 4
+// ==================================================================================================================
+
+CXR_INLINE void v4_copy( v4f a, v4f b )
+{
+       b[0] = a[0]; b[1] = a[1]; b[2] = a[2]; b[3] = a[3];
+}
+
+CXR_INLINE void v4_zero( v4f a )
+{
+       a[0] = 0.f; a[1] = 0.f; a[2] = 0.f; a[3] = 0.f;
+}
+
+CXR_INLINE void v4_muls( v4f a, double s, v4f d )
+{
+       d[0] = a[0]*s; d[1] = a[1]*s; d[2] = a[2]*s; d[3] = a[3]*s;
+}
+
+// Matrix 3x3
+//======================================================================================================
+
+CXR_INLINE void m3x3_inv_transpose( m3x3f src, m3x3f dest )
+{
+       double a = src[0][0], b = src[0][1], c = src[0][2],
+                       d = src[1][0], e = src[1][1], f = src[1][2],
+                       g = src[2][0], h = src[2][1], i = src[2][2];
+
+       double det =    1.f / 
+                                       (+a*(e*i-h*f)
+                -b*(d*i-f*g)
+                +c*(d*h-e*g));
+                
+       dest[0][0] =  (e*i-h*f)*det;
+       dest[1][0] = -(b*i-c*h)*det;
+       dest[2][0] =  (b*f-c*e)*det;
+       dest[0][1] = -(d*i-f*g)*det;
+       dest[1][1] =  (a*i-c*g)*det;
+       dest[2][1] = -(a*f-d*c)*det;
+       dest[0][2] =  (d*h-g*e)*det;
+       dest[1][2] = -(a*h-g*b)*det;
+       dest[2][2] =  (a*e-d*b)*det;
+}
+
+CXR_INLINE void m3x3_mulv( m3x3f m, v3f v, v3f d )
+{
+       v3f res;
+       
+       res[0] = m[0][0]*v[0] + m[1][0]*v[1] + m[2][0]*v[2];
+       res[1] = m[0][1]*v[0] + m[1][1]*v[1] + m[2][1]*v[2];
+       res[2] = m[0][2]*v[0] + m[1][2]*v[1] + m[2][2]*v[2];
+       
+       v3_copy( res, d );
+}
+
+// Matrix 4x3
+// ==================================================================================================================
+
+#define M4X3_IDENTITY  {{1.0f, 0.0f, 0.0f, },\
+                                                               { 0.0f, 1.0f, 0.0f, },\
+                                                               { 0.0f, 0.0f, 1.0f, },\
+                                                               { 0.0f, 0.0f, 0.0f }}
+
+CXR_INLINE void m4x3_to_3x3( m4x3f a, m3x3f b )
+{
+       v3_copy( a[0], b[0] );
+       v3_copy( a[1], b[1] );
+       v3_copy( a[2], b[2] );
+}
+
+CXR_INLINE void m4x3_copy( m4x3f a, m4x3f b )
+{
+       v3_copy( a[0], b[0] );
+       v3_copy( a[1], b[1] );
+       v3_copy( a[2], b[2] );
+       v3_copy( a[3], b[3] );
+}
+
+CXR_INLINE void m4x3_identity( m4x3f a )
+{
+       m4x3f id = M4X3_IDENTITY;
+       m4x3_copy( id, a );
+}
+
+CXR_INLINE void m4x3_mul( m4x3f a, m4x3f b, m4x3f d ) 
+{
+       double 
+       a00 = a[0][0], a01 = a[0][1], a02 = a[0][2],
+       a10 = a[1][0], a11 = a[1][1], a12 = a[1][2],
+       a20 = a[2][0], a21 = a[2][1], a22 = a[2][2],
+       a30 = a[3][0], a31 = a[3][1], a32 = a[3][2],
+       b00 = b[0][0], b01 = b[0][1], b02 = b[0][2],
+       b10 = b[1][0], b11 = b[1][1], b12 = b[1][2],
+       b20 = b[2][0], b21 = b[2][1], b22 = b[2][2],
+       b30 = b[3][0], b31 = b[3][1], b32 = b[3][2];
+       
+       d[0][0] = a00*b00 + a10*b01 + a20*b02;
+       d[0][1] = a01*b00 + a11*b01 + a21*b02;
+       d[0][2] = a02*b00 + a12*b01 + a22*b02;
+       d[1][0] = a00*b10 + a10*b11 + a20*b12;
+       d[1][1] = a01*b10 + a11*b11 + a21*b12;
+       d[1][2] = a02*b10 + a12*b11 + a22*b12;
+       d[2][0] = a00*b20 + a10*b21 + a20*b22;
+       d[2][1] = a01*b20 + a11*b21 + a21*b22;
+       d[2][2] = a02*b20 + a12*b21 + a22*b22;
+       d[3][0] = a00*b30 + a10*b31 + a20*b32 + a30;
+       d[3][1] = a01*b30 + a11*b31 + a21*b32 + a31;
+       d[3][2] = a02*b30 + a12*b31 + a22*b32 + a32;
+}
+
+CXR_INLINE void m4x3_mulv( m4x3f m, v3f v, v3f d ) 
+{
+       v3f res;
+  
+       res[0] = m[0][0]*v[0] + m[1][0]*v[1] + m[2][0]*v[2] + m[3][0];
+       res[1] = m[0][1]*v[0] + m[1][1]*v[1] + m[2][1]*v[2] + m[3][1];
+       res[2] = m[0][2]*v[0] + m[1][2]*v[1] + m[2][2]*v[2] + m[3][2];
+
+       v3_copy( res, d );
+}
+
+// Affine transforms
+
+CXR_INLINE void m4x3_translate( m4x3f m, v3f v )
+{
+       v3_muladds( m[3], m[0], v[0], m[3] );
+       v3_muladds( m[3], m[1], v[1], m[3] );
+       v3_muladds( m[3], m[2], v[2], m[3] );
+}
+
+CXR_INLINE void m4x3_scale( m4x3f m, double s )
+{
+       v3_muls( m[0], s, m[0] );
+       v3_muls( m[1], s, m[1] );
+       v3_muls( m[2], s, m[2] );
+}
+
+CXR_INLINE void m4x3_rotate_x( m4x3f m, double angle )
+{
+       m4x3f t = M4X3_IDENTITY;
+       double c, s;
+
+       c = cosf( angle );
+       s = sinf( angle );
+
+       t[1][1] =  c;
+       t[1][2] =  s;
+       t[2][1] = -s;
+       t[2][2] =  c;
+
+       m4x3_mul( m, t, m );
+}
+
+CXR_INLINE void m4x3_rotate_y( m4x3f m, double angle )
+{
+       m4x3f t = M4X3_IDENTITY;
+       double c, s;
+
+       c = cosf( angle );
+       s = sinf( angle );
+
+       t[0][0] =  c;
+       t[0][2] = -s;
+       t[2][0] =  s;
+       t[2][2] =  c;
+
+       m4x3_mul( m, t, m );
+}
+
+CXR_INLINE void m4x3_rotate_z( m4x3f m, double angle )
+{
+       m4x3f t = M4X3_IDENTITY;
+       double c, s;
+
+       c = cosf( angle );
+       s = sinf( angle );
+
+       t[0][0] =  c;
+       t[0][1] =  s;
+       t[1][0] = -s;
+       t[1][1] =  c;
+
+       m4x3_mul( m, t, m );
+}
+
+// Warning: These functions are unoptimized..
+CXR_INLINE void m4x3_expand_aabb_point( m4x3f m, boxf box, v3f point )
+{
+       v3f v;
+       m4x3_mulv( m, point, v );
+
+       v3_minv( box[0], v, box[0] );
+       v3_maxv( box[1], v, box[1] );
+}
+
+CXR_INLINE void box_concat( boxf a, boxf b )
+{
+       v3_minv( a[0], b[0], a[0] );
+       v3_maxv( a[1], b[1], a[1] );
+}
+
+CXR_INLINE void box_copy( boxf a, boxf b )
+{
+       v3_copy( a[0], b[0] );
+       v3_copy( a[1], b[1] );
+}
+
+CXR_INLINE void m4x3_transform_aabb( m4x3f m, boxf box )
+{
+       v3f a; v3f b;
+       
+       v3_copy( box[0], a );
+       v3_copy( box[1], b );
+       v3_fill( box[0],  INFINITY );
+       v3_fill( box[1], -INFINITY );
+
+       m4x3_expand_aabb_point( m, box, a );
+       m4x3_expand_aabb_point( m, box, (v3f){ a[0], b[1], a[2] } );
+       m4x3_expand_aabb_point( m, box, (v3f){ b[0], a[1], a[2] } );
+       m4x3_expand_aabb_point( m, box, (v3f){ b[0], b[1], a[2] } );
+       m4x3_expand_aabb_point( m, box, b );
+       m4x3_expand_aabb_point( m, box, (v3f){ a[0], b[1], b[2] } );
+       m4x3_expand_aabb_point( m, box, (v3f){ b[0], a[1], b[2] } );
+       m4x3_expand_aabb_point( m, box, (v3f){ b[0], b[1], b[2] } );
+}
+
+CXR_INLINE void tri_normal( v3f p0, v3f p1, v3f p2, v3f normal )
+{
+   v3f v0, v1;
+   v3_sub( p1, p0, v0 );
+   v3_sub( p2, p0, v1 );
+   v3_cross( v0, v1, normal );
+   v3_normalize( normal );
+}
+
+CXR_INLINE void tri_to_plane( v3f a, v3f b, v3f c, v4f plane )
+{
+   tri_normal( a,b,c, plane );
+   plane[3] = v3_dot( plane, a );
+}
+
+// TODO update this code to use normal v3_x functions 
+CXR_INLINE void tri_to_plane1( double a[3], double b[3], double c[3], double p[4] )
+{
+       double edge0[3];
+       double edge1[3];
+       double l;
+       
+       edge0[0] = b[0] - a[0];
+       edge0[1] = b[1] - a[1];
+       edge0[2] = b[2] - a[2];
+       
+       edge1[0] = c[0] - a[0];
+       edge1[1] = c[1] - a[1];
+       edge1[2] = c[2] - a[2];
+       
+       p[0] = edge0[1] * edge1[2] - edge0[2] * edge1[1];
+       p[1] = edge0[2] * edge1[0] - edge0[0] * edge1[2];
+       p[2] = edge0[0] * edge1[1] - edge0[1] * edge1[0];
+       
+       l = sqrt(p[0] * p[0] + p[1] * p[1] + p[2] * p[2]);
+       p[3] = (p[0] * a[0] + p[1] * a[1] + p[2] * a[2]) / l;
+       
+       p[0] = p[0] / l;
+       p[1] = p[1] / l;
+       p[2] = p[2] / l;
+}
+
+CXR_INLINE int plane_intersect( double a[4], double b[4], double c[4], double p[3] )
+{
+       double const epsilon = 0.001;
+       
+       double x[3];
+       double d;
+       
+       x[0] = a[1] * b[2] - a[2] * b[1];
+       x[1] = a[2] * b[0] - a[0] * b[2];
+       x[2] = a[0] * b[1] - a[1] * b[0];
+       
+       d = x[0] * c[0] + x[1] * c[1] + x[2] * c[2];
+       
+       if( d < epsilon && d > -epsilon ) return 0;
+       
+       p[0] = (b[1] * c[2] - b[2] * c[1]) * -a[3];
+       p[1] = (b[2] * c[0] - b[0] * c[2]) * -a[3];
+       p[2] = (b[0] * c[1] - b[1] * c[0]) * -a[3];
+       
+       p[0] += (c[1] * a[2] - c[2] * a[1]) * -b[3];
+       p[1] += (c[2] * a[0] - c[0] * a[2]) * -b[3];
+       p[2] += (c[0] * a[1] - c[1] * a[0]) * -b[3];
+       
+       p[0] += (a[1] * b[2] - a[2] * b[1]) * -c[3];
+       p[1] += (a[2] * b[0] - a[0] * b[2]) * -c[3];
+       p[2] += (a[0] * b[1] - a[1] * b[0]) * -c[3];
+       
+       p[0] = -p[0] / d;
+       p[1] = -p[1] / d;
+       p[2] = -p[2] / d;
+       
+       return 1;
+}
+
+CXR_INLINE void normal_to_plane( v3f normal, v3f p, v4f plane )
+{
+   v3_copy( normal, plane );
+   plane[3] = v3_dot( normal, p );
+}
+
+CXR_INLINE double plane_polarity( double p[4], double a[3] )
+{
+       return 
+       (a[0] * p[0] + a[1] * p[1] + a[2] * p[2])
+       -(p[0]*p[3] * p[0] + p[1]*p[3] * p[1] + p[2]*p[3] * p[2])
+       ;
+}

diff --git a/src/cxr_mem.h b/src/cxr_mem.h
new file mode 100644 (file)
index 0000000..64675b8
--- /dev/null
+++ b/src/cxr_mem.h
@@ -0,0 +1,100 @@
+struct cxr_auto_buffer
+{
+   void *arr;
+
+   u32 esize,
+       count,
+       capacity;
+};
+
+#ifdef CXR_DEBUG_ALLOCATORS
+ #define CXR_STR_PRE(x) #x
+ #define CXR_STR(x) CXR_STR_PRE(x)
+ #define cxr_ab_ptr(b,i) __cxr_ab_ptr(b,i, __FILE__ ":L" CXR_STR(__LINE__) )
+#else 
+ #define cxr_ab_ptr(b,i) __cxr_ab_ptr(b,i)
+#endif
+
+static void *__cxr_ab_ptr( struct cxr_auto_buffer *buffer, u32 index
+
+#ifdef CXR_DEBUG_ALLOCATORS
+      ,const char *debug_str 
+#endif
+
+)
+{
+
+#ifdef CXR_DEBUG_ALLOCATORS
+   if( index >= buffer->capacity || index < 0 )
+   {
+      printf( "index out of capactity (%d /: [0->%d (cap)]) (%s)\n", index, buffer->capacity, debug_str );
+      exit(1);
+   }
+#endif
+
+   return buffer->arr + buffer->esize*index;
+}
+
+static void cxr_ab_reserve( struct cxr_auto_buffer *buffer, u32 count )
+{
+   if( buffer->count + count > buffer->capacity )
+   {
+      buffer->capacity = cxr_max(buffer->capacity*2, buffer->capacity+count);
+      buffer->arr = realloc( buffer->arr, buffer->capacity*buffer->esize );
+   }
+}
+
+static void *cxr_ab_empty( struct cxr_auto_buffer *buffer )
+{
+   cxr_ab_reserve( buffer, 1 );
+   return cxr_ab_ptr( buffer, buffer->count ++ );
+}
+
+static void *cxr_ab_empty_at( struct cxr_auto_buffer *buffer, int at )
+{
+   cxr_ab_reserve( buffer, 1 );
+   
+   if( at == buffer->count )
+   {
+      buffer->count ++;
+      return cxr_ab_ptr( buffer, at );
+   }
+
+   // Shift rest 1 right
+   memmove
+   ( 
+      cxr_ab_ptr( buffer, at+1 ), 
+      cxr_ab_ptr( buffer, at ), 
+      (buffer->count-at)*buffer->esize 
+   );
+
+   buffer->count ++;
+   return cxr_ab_ptr( buffer, at );
+}
+
+static void cxr_ab_push( struct cxr_auto_buffer *buffer, void *em )
+{
+   cxr_ab_reserve( buffer, 1 );
+
+   memcpy( buffer->arr+buffer->count*buffer->esize, em, buffer->esize );
+   buffer->count ++;
+}
+
+static void cxr_ab_init( struct cxr_auto_buffer *buffer, u32 esize, u32 cap )
+{
+   buffer->esize = esize;
+   buffer->capacity = cxr_max(1,cap);
+   buffer->count = 0;
+
+   buffer->arr = malloc( buffer->esize*buffer->capacity );
+}
+
+static void cxr_ab_clear( struct cxr_auto_buffer *buffer )
+{
+   buffer->count = 0;
+}
+
+static void cxr_ab_free( struct cxr_auto_buffer *buffer )
+{
+   free( buffer->arr );
+}

diff --git a/src/nbvtf/librgbcx.h b/src/nbvtf/librgbcx.h
new file mode 100644 (file)
index 0000000..31ded0c
--- /dev/null
+++ b/src/nbvtf/librgbcx.h
@@ -0,0 +1,19 @@
+#ifndef LIBRGBCX_H
+#define LIBRGBCX_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define LIBRGBCX_MAX_LEVEL 18
+#define LIBRGBCX_MIN_LEVEL 0
+
+void rgbcx__init(void);
+void rgbcx__encode_bc1( uint32_t level, void* pDst, const uint8_t* pPixels, int allow_3color, int use_transparent_texels_for_black );
+void rgbcx__encode_bc3( uint32_t level, void* pDst, const uint8_t* pPixels );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

diff --git a/src/nbvtf/nbvtf.h b/src/nbvtf/nbvtf.h
new file mode 100644 (file)
index 0000000..3ed8536
--- /dev/null
+++ b/src/nbvtf/nbvtf.h
@@ -0,0 +1,799 @@
+// nbvtf.h - v1.02 - Writer for Valve Texture Format - public domain
+// Written by Harry 'hgn' Godden
+//
+// Credits:
+//   Rich Geldreich - bc7enc (BC1/BC3 High Quality texture compression)
+//   Fabian "ryg" Giesen, stb - stb_dxt (BC1/BC3 realtime compressors)
+//   Sean Barrett - stb_image.h, stb_image_write.h (Image I/O)
+//
+// Note:
+//   This library assumes normal maps are input in OpenGL(correct) format, and will be converted into DirectX(incorrect) at
+//   compile time automatically. Do not submit DirectX normals into this software.
+//
+// Since this project uses stb_image, use '#define STB_IMAGE_IMPLEMENTATION' before including
+// Additionally, to use high quality DXT, '#define USE_LIBRGBCX'
+//
+// USAGE:
+//   Call these functions:
+//     int nbvtf_convert( const char *src, int w, int h, int mipmap, EImageFormat_t format, uint32_t usr_flags, const char *dest );
+//     int nbvtf_write( uint8_t *src, int w, int h, int mipmap, EImageFormat_t format, uint32_t usr_flags, const char *dest );
+//
+// Param definitions:
+//   src - RGBA byte data of image
+//   w - width of image
+//   h - height of image
+//   mipmap - enable mipmap generation (box filter), 1/0
+//   format - Choose from: k_EImageFormat_DXT1, compressedk_EImageFormat_DXT5, k_EImageFormat_BGR888, k_EImageFormat_ABGR8888
+//   usr_flags - You can append any flags but only really need TEXTUREFLAGS_NORMAL if texture is normal map
+//   dest - file path to write vtf to
+//  
+// Convert specific:
+//   src - file path of source image to convert
+//   w, h - MAXIMUM image dimentions of final product. Set as 0 to be automatic
+//
+// version history:
+//   v1.02  - Improved box filtering, small bug fixes
+//   v1.01  - switch to OpenGL normal format for input
+//   v1.00  - (hgn) first release
+//
+// LICENSE
+//   See end of file for license information.
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NBVTF_MAX_MIPLEVELS 9
+#define nbvtf__min(a,b) (((a)<(b))?(a):(b))
+#define nbvtf__max(a,b) (((a)>(b))?(a):(b))
+
+#ifdef NBVTF_AS_SO
+ #include <stdio.h>
+ #include <string.h>
+ #include <stdint.h>
+ #include <math.h>
+ 
+ #define NBVTF_SHOW_STDERR
+ #define STB_IMAGE_IMPLEMENTATION
+#endif
+
+#include "stb/stb_image.h"
+
+#ifdef USE_LIBRGBCX
+ #include "librgbcx.h"
+#else
+ #define STB_DXT_IMPLEMENTATION
+ #include "stb/stb_dxt.h"
+#endif
+
+#ifdef NBVTF_SHOW_STDERR
+ #define NBVTF_ERR(...)
+#else
+ #define NBVTF_ERR(...) fprintf( stderr, __VA_ARGS__ )
+#endif
+
+#pragma pack(push, 1)
+
+typedef enum EImageFormat
+{
+       // Name                                                                 // Supported?
+       k_EImageFormat_NONE = -1,
+       k_EImageFormat_RGBA8888 = 0,            // YES
+       k_EImageFormat_ABGR8888, 
+       k_EImageFormat_RGB888,                          // YES
+       k_EImageFormat_BGR888,
+       k_EImageFormat_RGB565,
+       k_EImageFormat_I8,
+       k_EImageFormat_IA88,
+       k_EImageFormat_P8,
+       k_EImageFormat_A8,
+       k_EImageFormat_RGB888_BLUESCREEN,
+       k_EImageFormat_BGR888_BLUESCREEN,
+       k_EImageFormat_ARGB8888,
+       k_EImageFormat_BGRA8888,
+       k_EImageFormat_DXT1,                                    // YES
+       k_EImageFormat_DXT3,
+       k_EImageFormat_DXT5,                                    // YES
+       k_EImageFormat_BGRX8888,
+       k_EImageFormat_BGR565,
+       k_EImageFormat_BGRX5551,
+       k_EImageFormat_BGRA4444,
+       k_EImageFormat_DXT1_ONEBITALPHA,
+       k_EImageFormat_BGRA5551,
+       k_EImageFormat_UV88,
+       k_EImageFormat_UVWQ8888,
+       k_EImageFormat_RGBA16161616F,
+       k_EImageFormat_RGBA16161616,
+       k_EImageFormat_UVLX8888
+} EImageFormat_t;
+
+const char *vtf_format_strings[] = 
+{
+       // Name                                                                 // Supported?
+       "RGBA8888",
+       "ABGR8888",
+       "RGB888",
+       "BGR888",
+       "RGB565",
+       "I8",
+       "IA88",
+       "P8",
+       "A8",
+       "RGB888_BLUESCREEN",
+       "BGR888_BLUESCREEN",
+       "ARGB8888",
+       "BGRA8888",
+#ifdef USE_LIBRGBCX
+       "DXT1 (rgbcx.h)",
+#else
+       "DXT1 (stb_dxt.h)",
+#endif
+       "DXT3",
+#ifdef USE_LIBRGBCX
+       "DXT5 (rgbcx.h)",
+#else
+       "DXT5 (stb_dxt.h)",
+#endif
+       "BGRX8888",
+       "BGR565",
+       "BGRX5551",
+       "BGRA4444",
+       "DXT1_ONEBITALPHA",
+       "BGRA5551",
+       "UV88",
+       "UVWQ8888",
+       "RGBA16161616F",
+       "RGBA16161616",
+       "UVLX8888"
+};
+
+enum flag
+{
+       // Flags from the *.txt config file
+       TEXTUREFLAGS_POINTSAMPLE = 0x00000001,
+       TEXTUREFLAGS_TRILINEAR = 0x00000002,
+       TEXTUREFLAGS_CLAMPS = 0x00000004,
+       TEXTUREFLAGS_CLAMPT = 0x00000008,
+       TEXTUREFLAGS_ANISOTROPIC = 0x00000010,
+       TEXTUREFLAGS_HINT_DXT5 = 0x00000020,
+       TEXTUREFLAGS_PWL_CORRECTED = 0x00000040,
+       TEXTUREFLAGS_NORMAL = 0x00000080,
+       TEXTUREFLAGS_NOMIP = 0x00000100,
+       TEXTUREFLAGS_NOLOD = 0x00000200,
+       TEXTUREFLAGS_ALL_MIPS = 0x00000400,
+       TEXTUREFLAGS_PROCEDURAL = 0x00000800,
+
+       // These are automatically generated by vtex from the texture data.
+       TEXTUREFLAGS_ONEBITALPHA = 0x00001000,
+       TEXTUREFLAGS_EIGHTBITALPHA = 0x00002000,
+
+       // Newer flags from the *.txt config file
+       TEXTUREFLAGS_ENVMAP = 0x00004000,
+       TEXTUREFLAGS_RENDERTARGET = 0x00008000,
+       TEXTUREFLAGS_DEPTHRENDERTARGET = 0x00010000,
+       TEXTUREFLAGS_NODEBUGOVERRIDE = 0x00020000,
+       TEXTUREFLAGS_SINGLECOPY = 0x00040000,
+       TEXTUREFLAGS_PRE_SRGB = 0x00080000,
+
+       TEXTUREFLAGS_UNUSED_00100000 = 0x00100000,
+       TEXTUREFLAGS_UNUSED_00200000 = 0x00200000,
+       TEXTUREFLAGS_UNUSED_00400000 = 0x00400000,
+
+       TEXTUREFLAGS_NODEPTHBUFFER = 0x00800000,
+
+       TEXTUREFLAGS_UNUSED_01000000 = 0x01000000,
+
+       TEXTUREFLAGS_CLAMPU = 0x02000000,
+       TEXTUREFLAGS_VERTEXTEXTURE = 0x04000000,
+       TEXTUREFLAGS_SSBUMP = 0x08000000,
+
+       TEXTUREFLAGS_UNUSED_10000000 = 0x10000000,
+
+       TEXTUREFLAGS_BORDER = 0x20000000,
+
+       TEXTUREFLAGS_UNUSED_40000000 = 0x40000000,
+       TEXTUREFLAGS_UNUSED_80000000 = 0x80000000,
+};
+
+typedef struct vtfheader
+{
+       union
+       {
+       char                            signature[4];                   // File signature ("VTF\0"). (or as little-endian integer, 0x00465456)
+       uint32_t                        usig;
+       };
+       
+       unsigned int    version[2];                             // version[0].version[1] (currently 7.2).
+       unsigned int    headerSize;                             // Size of the header struct  (16 byte aligned; currently 80 bytes) + size of the resources dictionary (7.3+).
+       unsigned short  width;                                  // Width of the largest mipmap in pixels. Must be a power of 2.
+       unsigned short  height;                                 // Height of the largest mipmap in pixels. Must be a power of 2.
+       unsigned int    flags;                                  // VTF flags.
+       unsigned short  frames;                                 // Number of frames, if animated (1 for no animation).
+       unsigned short  firstFrame;                             // First frame in animation (0 based).
+       unsigned char   padding0[4];                    // reflectivity padding (16 byte alignment).
+       float                           reflectivity[3];                // reflectivity vector.
+       unsigned char   padding1[4];                    // reflectivity padding (8 byte packing).
+       float                           bumpmapScale;                   // Bumpmap scale.
+       unsigned int    highResImageFormat;     // High resolution image format.
+       unsigned char   mipmapCount;                    // Number of mipmaps.
+       unsigned int    lowResImageFormat;      // Low resolution image format (always DXT1).
+       unsigned char   lowResImageWidth;               // Low resolution image width.
+       unsigned char   lowResImageHeight;      // Low resolution image height.
+
+       // 7.2+
+       unsigned short  depth;                                  // Depth of the largest mipmap in pixels.
+                                                                                                       // Must be a power of 2. Can be 0 or 1 for a 2D texture (v7.2 only).
+
+       // 7.3+
+       unsigned char   padding2[3];                    // depth padding (4 byte alignment).
+       unsigned int    numResources;                   // Number of resources this vtf has
+       
+       unsigned char  padding3[8];        // Necessary on certain compilers
+} vtfheader_t;
+
+#pragma pack(pop)
+
+typedef struct mipimg
+{
+       uint32_t w;
+       uint32_t h;
+       uint32_t src_offset;
+} mipimg_t;
+
+int nbvtf_power2( uint32_t x )
+{
+    return (x != 0) && ((x & (x - 1)) == 0);
+}
+
+int nbvtf_power2x( uint32_t y, uint32_t x )
+{
+       return nbvtf_power2( y ) && nbvtf_power2( x );
+}
+
+int nbvtf_lower( int *x, int *y )
+{
+       if( *x == 1 && *y == 1 )
+       {
+               return 0;
+       }
+
+       *x = nbvtf__max( 1, (*x)/2 );
+       *y = nbvtf__max( 1, (*y)/2 );
+       
+       return 1;
+}
+
+int nbvtf_lowres_index( int w, int h )
+{
+       int x, y;
+       int i = 0;
+       
+       x = w;
+       y = h;
+       
+       while(1)
+       {
+               if( (x <= 16) && ( y <= 16 ) )
+               {
+                       return i;
+               }
+               
+               i ++;
+               
+               nbvtf_lower( &x, &y );
+       }
+}
+
+// Simple box filter downscale
+void nbvtf_downscale( uint8_t *src, int w, int h, int dw, int dh, uint8_t *dest )
+{
+   int bx = w/dw;
+   int by = h/dh;
+   int div = bx*by;
+
+       for( int y = 0; y < dh; y ++ )
+   for( int x = 0; x < dw; x ++ )
+   {
+      // Average block colours
+      uint32_t tr = 0, tg = 0, tb = 0, ta = 0;
+
+      for( int yy = 0; yy < by; yy ++ )
+      for( int xx = 0; xx < bx; xx ++ )
+      {
+         uint8_t *psrc = &src[ (x*bx+xx + (y*by+yy)*w)*4 ];
+         tr+=psrc[0];
+         tg+=psrc[1];
+         tb+=psrc[2];
+         ta+=psrc[3];
+      }
+      
+      uint8_t *pdst = &dest[ (y*dw + x)*4 ];
+      pdst[0] = tr / div;
+      pdst[1] = tg / div;
+      pdst[2] = tb / div;
+      pdst[3] = ta / div;
+       }
+}
+
+uint8_t *nbvtf_create_mipmaps( uint8_t *src, int w, int h, mipimg_t *offsets, int *num )
+{
+       int memory = 0;
+       int x, y, i;
+       uint32_t offset;
+       
+       x = w;
+       y = h;
+       while( nbvtf_lower( &x, &y ) )
+               memory += x*y*4;
+       
+       uint8_t *mipmem = (uint8_t *)malloc( memory );
+       
+       if( mipmem )
+       {
+               x = w;
+               y = h;
+               i = 0;
+               offset = 0;
+               
+               uint8_t *dest = mipmem;
+               
+               while(1)
+               {
+                       if( !nbvtf_lower( &x, &y ) )
+                               break;
+
+                       nbvtf_downscale( src, w, h, x, y, dest );
+                       
+                       offsets[ i ].src_offset = offset;
+                       offsets[ i ].w = x;
+                       offsets[ i ].h = y;
+                       i ++;
+                       
+                       offset += x*y*4;
+                       dest = mipmem + offset;
+               }
+               
+               *num = i;
+               return mipmem;
+       }
+       else
+       {
+               NBVTF_ERR( "nbvtf_write:err out of memory allocating mipmap buffer!\n" );
+               return NULL;
+       }
+}
+
+void nbvtf_reflectivity( uint8_t *src, int w, int h, float *dest )
+{
+       uint32_t totals[3] = {0,0,0};
+       
+       for( int i = 0; i < w*h; i ++ )
+       {
+               totals[0] += src[i*4+0];
+               totals[1] += src[i*4+1];
+               totals[2] += src[i*4+2];
+       }
+       
+       dest[0] = (float)( totals[0] / (w*h) ) / 255.0f;
+       dest[1] = (float)( totals[1] / (w*h) ) / 255.0f;
+       dest[2] = (float)( totals[2] / (w*h) ) / 255.0f;
+}
+
+#ifdef NBVTF_ALLOW_EXPORT
+void nbvtf_debug_view_mips( uint8_t *src, int w, int h )
+{
+       int x, y, i;
+       char fnbuf[512];
+       
+       x = w;
+       y = h;
+       i = 1;
+
+       uint8_t *dest = src;
+
+       while( nbvtf_lower( &x, &y ) )
+       {
+               sprintf( fnbuf, "mip_%d.png", i ++ );
+       
+               stbi_write_png( fnbuf, x,y, 4, dest, x*4 );
+               dest += x*y*4;
+       }
+}
+#endif
+
+void nbvtf_dxt_pad( uint8_t *src, int bx, int by, int w, int h, uint8_t *dest )
+{
+       int px = bx*4;
+       int py = by*4;
+       
+       uint32_t *stream = (uint32_t *)src;
+       uint32_t *stream_out = (uint32_t *)dest;
+
+       for( int y = 0; y < 4; y ++ )
+       {
+               for( int x = 0; x < 4; x ++ )
+               {
+                       stream_out[ y*4+x ] = stream[ nbvtf__min( py+y, h-1 )*w + nbvtf__min( px+x, w-1 ) ];
+               }
+       }
+}
+
+uint32_t nbvtf_dxt_sizeimg( int w, int h, int alpha )
+{
+       uint32_t blocks_x, blocks_y;
+       int block_size = alpha? 16: 8;
+
+       blocks_x = ((uint32_t)w) >> 2;
+       blocks_y = ((uint32_t)h) >> 2;
+       
+       int padx = w % 4 != 0? 1: 0;
+       int pady = h % 4 != 0? 1: 0;
+       
+       return (blocks_x+padx)*(blocks_y+pady)*block_size;
+}
+
+uint32_t nbvtf_sizeimg( int w, int h, EImageFormat_t format )
+{
+       if( format == k_EImageFormat_DXT5 || format == k_EImageFormat_DXT1 )
+       {
+               return nbvtf_dxt_sizeimg( w, h, format == k_EImageFormat_DXT1? 0: 1 );
+       }
+       
+       if( format == k_EImageFormat_BGR888 )
+               return w*h*3;
+               
+       if( format == k_EImageFormat_ABGR8888 )
+               return w*h*4;
+               
+       return 0;
+}
+
+void nbvtf_dxt_block( uint8_t *dest, uint8_t *src, int alpha )
+{
+#ifdef USE_LIBRGBCX
+       // TODO: move this somewehre else
+       static int init = 0;
+       if( !init )
+       {
+               rgbcx__init();
+               init = 1;
+       }
+
+       if( alpha )
+       {
+               rgbcx__encode_bc3( 12, dest, src );
+       }
+       else
+       {
+               rgbcx__encode_bc1( 12, dest, src, 0, 0 );
+       }
+#else
+       stb_compress_dxt_block( dest, src, alpha, STB_DXT_HIGHQUAL );
+#endif
+}
+
+void nbvtf_compress_dxt( uint8_t *src, int w, int h, int alpha, uint8_t *dest )
+{
+       uint32_t blocks_x, blocks_y;
+
+       blocks_x = ((uint32_t)w) >> 2;
+       blocks_y = ((uint32_t)h) >> 2;
+       
+       int padx = w % 4 != 0? 1: 0;
+       int pady = h % 4 != 0? 1: 0;
+       
+       int block_size = alpha? 16: 8;
+       
+       uint8_t *dest_block = dest;
+       
+       uint8_t working_block[ 4*4*4 ];
+       
+       // Compress rows
+       for( int y = 0; y < blocks_y; y ++ )
+       {
+               for( int x = 0; x < blocks_x; x ++ )
+               {
+                       uint8_t *src_begin = src + (y*w*4 + x*4)*4;
+                       for( int i = 0; i < 4; i ++ )
+                       {
+                               memcpy( working_block + i*4*4, src_begin + w*4*i, 4*4 );
+                       }
+                       
+                       nbvtf_dxt_block( dest_block, working_block, alpha );
+                       dest_block += block_size;
+               }
+               
+               if( padx )
+               {
+                       nbvtf_dxt_pad( src, blocks_x, y, w, h, working_block );
+                       nbvtf_dxt_block( dest_block, working_block, alpha );
+                       dest_block += block_size;
+               }
+       }
+       
+       // Compress remainder row
+       if( pady )
+       {
+               for( int x = 0; x < blocks_x; x ++ )
+               {
+                       nbvtf_dxt_pad( src, x, blocks_y, w, h, working_block );
+                       nbvtf_dxt_block( dest_block, working_block, alpha );
+                       dest_block += block_size;
+               }
+       }
+       
+       // Compress last little corner
+       if( padx && pady )
+       {
+               nbvtf_dxt_pad( src, blocks_x, blocks_y, w, h, working_block );
+               nbvtf_dxt_block( dest_block, working_block, alpha );
+       }
+}
+
+void nbvtf_swizzle_to( uint8_t *src, int n, int nc, uint8_t *dest )
+{
+       for( int i = 0; i < n; i ++ )
+       {
+               for( int j = 0; j < nc; j ++ )
+               {
+                       dest[ i*nc+nc-j-1 ] = src[ i*4+j ];
+               }
+       }
+}
+
+void nbvtf_write_img_data( uint8_t *src, int w, int h, EImageFormat_t format, uint8_t *wb, FILE *file )
+{
+       switch( format )
+       {
+               case k_EImageFormat_DXT1:
+                       nbvtf_compress_dxt( src, w, h, 0, wb );
+                       fwrite( wb, nbvtf_dxt_sizeimg( w, h, 0 ), 1, file );
+               break;
+               case k_EImageFormat_DXT5:
+                       nbvtf_compress_dxt( src, w, h, 1, wb );
+                       fwrite( wb, nbvtf_dxt_sizeimg( w, h, 1 ), 1, file );
+               break;
+               case k_EImageFormat_ABGR8888:
+                       nbvtf_swizzle_to( src, w*h, 4, wb );
+                       fwrite( wb, w*h*4, 1, file );
+               break;
+               case k_EImageFormat_BGR888:
+                       nbvtf_swizzle_to( src, w*h, 3, wb );
+                       fwrite( wb, w*h*3, 1, file );
+               break;
+               
+               default:
+               break;
+       }
+}
+
+#ifdef NBVTF_AS_SO
+__attribute__((visibility("default")))
+#endif
+int nbvtf_write( uint8_t *reference, int w, int h, int mipmap, EImageFormat_t format, uint32_t usr_flags, const char *dest )
+{
+       if( !nbvtf_power2x(w,h) )
+       {
+               NBVTF_ERR( "nbvtf_write:err image dimentions were not power of two (%d %d)\n", w, h );
+               return 0;
+       }
+
+       mipimg_t mip_offsets[ 16 ];
+       int num_mips;
+       
+   uint8_t *src;
+
+   // Convert to directx normal
+   if( usr_flags & TEXTUREFLAGS_NORMAL )
+   {
+      src = malloc( w*h*4 );
+      for( int i = 0; i < w*h; i ++ )
+      {
+         src[i*4+0] = reference[i*4+0];
+         src[i*4+1] = 0xFF-reference[i*4+1];
+         src[i*4+2] = reference[i*4+2];
+         src[i*4+3] = reference[i*4+3];
+      }
+   }
+   else
+      src = reference;
+       
+       uint8_t *mip_data = nbvtf_create_mipmaps( src, w, h, mip_offsets, &num_mips );
+       
+       if( !mip_data )
+       {
+               NBVTF_ERR( "nbvtf_write:err mipmap data failed to generate" );
+
+      if( usr_flags & TEXTUREFLAGS_NORMAL )
+         free( src );
+
+               return 0;
+       }
+       
+       vtfheader_t header = {0};
+       
+       header.usig = 0x00465456;
+       header.headerSize = sizeof( vtfheader_t );
+       header.version[0] = 7;
+       header.version[1] = 2;
+       
+       header.width = w;
+       header.height = h;
+       header.flags = usr_flags;
+       
+       // Append format flags
+       if( !mipmap )
+       {
+               header.flags |= TEXTUREFLAGS_NOLOD;
+               header.flags |= TEXTUREFLAGS_NOMIP;
+       }
+       
+       if( format == k_EImageFormat_DXT5 || format == k_EImageFormat_ABGR8888 )
+       {
+               header.flags |= TEXTUREFLAGS_EIGHTBITALPHA;
+       }
+       
+       header.frames = 1;
+       header.firstFrame = 0;
+       nbvtf_reflectivity( mip_data + mip_offsets[ num_mips-1 ].src_offset, 1,1, header.reflectivity );
+       header.bumpmapScale = 1.0f;
+       
+       header.highResImageFormat = format;
+       header.mipmapCount = mipmap? 
+      nbvtf__min(num_mips,NBVTF_MAX_MIPLEVELS)+1: 1;
+       
+       header.lowResImageFormat = k_EImageFormat_DXT1;
+
+       header.depth = 1;
+       header.numResources = 0;
+       
+       int lr_index = nbvtf_lowres_index( w, h );
+       
+       uint8_t *lr_src;
+       
+       if( lr_index )
+       {
+               mipimg_t *mip = mip_offsets + (lr_index-1);
+               lr_src = mip_data + mip->src_offset;
+               
+               header.lowResImageWidth = mip->w;
+               header.lowResImageHeight = mip->h;
+       }
+       else
+       {
+               lr_src = src;
+               
+               header.lowResImageWidth = w;
+               header.lowResImageHeight = h;
+       }
+       
+       uint32_t size_highres = nbvtf_sizeimg( w, h, format );
+       uint32_t size_lowres = nbvtf_dxt_sizeimg( header.lowResImageWidth, header.lowResImageHeight, 0 );
+       
+       uint8_t *working_buffer = (uint8_t *)malloc( nbvtf__max( size_highres, size_lowres ) );
+       
+       if( !working_buffer )
+       {
+               NBVTF_ERR( "nbvtf_write:err out of memory allocating working buffer\n" );
+               free( mip_data );
+
+      if( usr_flags & TEXTUREFLAGS_NORMAL )
+         free( src );
+
+               return 0;
+       }
+       
+       FILE *file = fopen( dest, "wb" );
+       
+       if( !file )
+       {
+               NBVTF_ERR( "nbvtf_write:err could not open file stream for writing\n" );
+               
+               free( working_buffer );
+               free( mip_data );
+               
+      if( usr_flags & TEXTUREFLAGS_NORMAL )
+         free( src );
+
+               return 0;
+       }
+       
+       // Write header
+       fwrite( &header, sizeof( vtfheader_t ), 1, file );
+       
+       // Write low res
+       nbvtf_write_img_data( 
+               lr_src, header.lowResImageWidth, header.lowResImageHeight, k_EImageFormat_DXT1, working_buffer, file 
+       );
+       
+       // Write texture data
+       if( mipmap )
+       {
+      // !! Experimental !!
+      int start = nbvtf__max( 0, num_mips-NBVTF_MAX_MIPLEVELS );
+      
+               for( int i = start; i < num_mips; i ++ )
+               {
+                       mipimg_t *mip = mip_offsets + (num_mips - i -1);
+                       nbvtf_write_img_data( mip_data + mip->src_offset, mip->w, mip->h, format, working_buffer, file );
+               }
+       }
+       
+       // Write high resolution
+       nbvtf_write_img_data( src, w, h, format, working_buffer, file );
+       
+       fclose( file );
+
+       free( working_buffer );
+       free( mip_data );
+
+   if( usr_flags & TEXTUREFLAGS_NORMAL )
+      free( src );
+       
+       return 1;
+}
+
+#ifdef NBVTF_AS_SO
+__attribute__((visibility("default")))
+#endif
+int nbvtf_convert( const char *src, int w, int h, int mipmap, EImageFormat_t format, uint32_t usr_flags, const char *dest )
+{
+       if( (w && h) && !nbvtf_power2x(w,h) )
+       {
+               NBVTF_ERR( "nbvtf_convert:err requested dimentions were not power of two (%d %d)\n", w, h );
+               return 0;
+       }
+       
+       int x,y,n;
+       uint8_t *data = stbi_load( src, &x, &y, &n, 4 );
+       
+       if( data )
+       {
+               if( !nbvtf_power2x(x,y) )
+               {
+                       NBVTF_ERR( "nbvtf_convert:err loaded image dimentions were not power two (%d %d)\n", x, y );
+                       stbi_image_free( data );
+                       return 0;
+               }
+               
+               // Image size needs retargeting
+               if( (w && h) && ( x > w || y > h ) )
+         nbvtf_downscale( data, x, y, w, h, data );
+               
+               int status = nbvtf_write( data, w, h, mipmap, format, usr_flags, dest );
+               stbi_image_free( data );
+               
+               return status;
+       }
+       else
+       {
+               return 0;
+       }
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+/*
+LICENSE - Applies to nbvtf.h, pynbvtf.py, librgbcx.cc, librgbcx.h, vtf_cmd.c
+------------------------------------------------------------------------------
+Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/

diff --git a/src/nbvtf/rgbcx.h b/src/nbvtf/rgbcx.h
new file mode 100644 (file)
index 0000000..dd199b7
--- /dev/null
+++ b/src/nbvtf/rgbcx.h
@@ -0,0 +1,4221 @@
+// rgbcx.h v1.12
+// High-performance scalar BC1-5 encoders. Public Domain or MIT license (you choose - see below), written by Richard Geldreich 2020 <richgel99@gmail.com>.
+//
+// Influential references:
+// http://sjbrown.co.uk/2006/01/19/dxt-compression-techniques/
+// https://github.com/nothings/stb/blob/master/stb_dxt.h
+// https://gist.github.com/castano/c92c7626f288f9e99e158520b14a61cf
+// https://github.com/castano/icbc/blob/master/icbc.h
+// http://www.humus.name/index.php?page=3D&ID=79
+//
+// This is a single header file library. Be sure to "#define RGBCX_IMPLEMENTATION" in one .cpp file somewhere.
+//
+// Instructions:
+//
+// The library MUST be initialized by calling this function at least once before using any encoder or decoder functions:
+//
+// void rgbcx::init(bc1_approx_mode mode = cBC1Ideal);
+//
+// This function manipulates global state, so it is not thread safe. 
+// You can call it multiple times to change the global BC1 approximation mode.
+// Important: BC1/3 textures encoded using non-ideal BC1 approximation modes should only be sampled on parts from that vendor.
+// If you encode for AMD, average error on AMD parts will go down, but average error on NVidia parts will go up and vice versa.
+// If in doubt, encode in ideal BC1 mode.
+//
+// Call these functions to encode BC1-5:
+// void rgbcx::encode_bc1(uint32_t level, void* pDst, const uint8_t* pPixels, bool allow_3color, bool use_transparent_texels_for_black);
+// void rgbcx::encode_bc3(uint32_t level, void* pDst, const uint8_t* pPixels);
+// void rgbcx::encode_bc4(void* pDst, const uint8_t* pPixels, uint32_t stride = 4);
+// void rgbcx::encode_bc5(void* pDst, const uint8_t* pPixels, uint32_t chan0 = 0, uint32_t chan1 = 1, uint32_t stride = 4);
+//
+// - level ranges from MIN_LEVEL to MAX_LEVEL. The higher the level, the slower the encoder goes, but the higher the average quality.
+// levels [0,4] are fast and compete against stb_dxt (default and HIGHQUAL). The remaining levels compete against squish/NVTT/icbc and icbc HQ.
+// If in doubt just use level 10, set allow_3color to true and use_transparent_texels_for_black to false, and adjust as needed.
+//
+// - pDst is a pointer to the 8-byte (BC1/4) or 16-byte (BC3/5) destination block. 
+//
+// - pPixels is a pointer to the 32-bpp pixels, in either RGBX or RGBA format (R is first in memory). 
+// Alpha is always ignored by encode_bc1().
+//
+// - allow_3color: If true the encoder will use 3-color blocks. This flag is ignored unless level is >= 5 (because lower levels compete against stb_dxt and it doesn't support 3-color blocks).
+// Do not enable on BC3-5 textures. 3-color block usage slows down encoding.
+//
+// - use_transparent_texels_for_black: If true the encoder will use 3-color block transparent black pixels to code very dark or black texels. Your engine/shader MUST ignore the sampled 
+// alpha value for textures encoded in this mode. This is how NVidia's classic "nvdxt" encoder (used by many original Xbox titles) used to work by default on DXT1C textures. It increases 
+// average quality substantially (because dark texels/black are very common) and is highly recommended.
+// Do not enable on BC3-5 textures. 
+//
+// - stride is the source pixel stride, in bytes. It's typically 4.
+//
+// - chan0 and chan1 are the source channels. Typically they will be 0 and 1.
+//
+// All encoding and decoding functions are threade-safe.
+//
+// To reduce the compiled size of the encoder, set #define RGBCX_USE_SMALLER_TABLES to 1 before including this header.
+//
+#ifndef RGBCX_INCLUDE_H
+#define RGBCX_INCLUDE_H
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <algorithm>
+#include <assert.h>
+#include <limits.h>
+
+// By default, the table used to accelerate cluster fit on 4 color blocks uses a 969x128 entry table. 
+// To reduce the executable size, set RGBCX_USE_SMALLER_TABLES to 1, which selects the smaller 969x32 entry table. 
+#ifndef RGBCX_USE_SMALLER_TABLES
+#define RGBCX_USE_SMALLER_TABLES 1
+#endif
+
+namespace rgbcx
+{
+       enum class bc1_approx_mode
+       {
+               // The default mode. No rounding for 4-color colors 2,3. My older tools/compressors use this mode. 
+               // This matches the D3D10 docs on BC1.
+               cBC1Ideal = 0,
+
+               // NVidia GPU mode.
+               cBC1NVidia = 1,
+
+               // AMD GPU mode.
+               cBC1AMD = 2,
+               
+               // This mode matches AMD Compressonator's output. It rounds 4-color colors 2,3 (not 3-color color 2).
+               // This matches the D3D9 docs on DXT1.
+               cBC1IdealRound4 = 3
+       };
+
+       // init() MUST be called once before using the BC1 encoder.
+       // This function may be called multiple times to change the BC1 approximation mode. 
+       // This function initializes global state, so don't call it while other threads inside the encoder.
+       // Important: If you encode textures for a specific vendor's GPU's, beware that using that texture data on other GPU's may result in ugly artifacts. 
+       // Encode to cBC1Ideal unless you know the texture data will only be deployed or used on a specific vendor's GPU.
+       void init(bc1_approx_mode mode = bc1_approx_mode::cBC1Ideal);
+
+       // Optimally encodes a solid color block to BC1 format.
+       void encode_bc1_solid_block(void* pDst, uint32_t fr, uint32_t fg, uint32_t fb, bool allow_3color);
+
+       // BC1 low-level API encoder flags. You can ignore this if you use the simple level API.
+       enum
+       {
+               // Try to improve quality using the most likely total orderings. 
+               // The total_orderings_to_try parameter will then control the number of total orderings to try for 4 color blocks, and the 
+               // total_orderings_to_try3 parameter will control the number of total orderings to try for 3 color blocks (if they are enabled).
+               cEncodeBC1UseLikelyTotalOrderings = 2,
+               
+               // Use 2 least squares pass, instead of one (same as stb_dxt's HIGHQUAL option).
+               // Recommended if you're enabling cEncodeBC1UseLikelyTotalOrderings.
+               cEncodeBC1TwoLeastSquaresPasses = 4,
+                               
+               // cEncodeBC1Use3ColorBlocksForBlackPixels allows the BC1 encoder to use 3-color blocks for blocks containing black or very dark pixels. 
+               // You shader/engine MUST ignore the alpha channel on textures encoded with this flag.
+               // Average quality goes up substantially for my 100 texture corpus (~.5 dB), so it's worth using if you can.
+               // Note the BC1 encoder does not actually support transparency in 3-color mode.
+               // Don't set when encoding to BC3.
+               cEncodeBC1Use3ColorBlocksForBlackPixels = 8,
+
+               // If cEncodeBC1Use3ColorBlocks is set, the encoder can use 3-color mode for a small but noticeable gain in average quality, but lower perf.
+               // If you also specify the cEncodeBC1UseLikelyTotalOrderings flag, set the total_orderings_to_try3 paramter to the number of total orderings to try.
+               // Don't set when encoding to BC3.
+               cEncodeBC1Use3ColorBlocks = 16,
+
+               // cEncodeBC1Iterative will greatly increase encode time, but is very slightly higher quality.
+               // Same as squish's iterative cluster fit option. Not really worth the tiny boost in quality, unless you just don't care about perf. at all.
+               cEncodeBC1Iterative = 32,
+
+               // cEncodeBC1BoundingBox enables a fast all-integer PCA approximation on 4-color blocks. 
+               // At level 0 options (no other flags), this is ~15% faster, and higher *average* quality.
+               cEncodeBC1BoundingBox = 64,
+                               
+               // Use a slightly lower quality, but ~30% faster MSE evaluation function for 4-color blocks.
+               cEncodeBC1UseFasterMSEEval = 128,
+               
+               // Examine all colors to compute selectors/MSE (slower than default)
+               cEncodeBC1UseFullMSEEval = 256,
+
+               // Use 2D least squares+inset+optimal rounding (the method used in Humus's GPU texture encoding demo), instead of PCA. 
+               // Around 18% faster, very slightly lower average quality to better (depends on the content).
+               cEncodeBC1Use2DLS = 512,
+
+               // Use 6 power iterations vs. 4 for PCA.
+               cEncodeBC1Use6PowerIters = 2048,
+               
+               // Check all total orderings - *very* slow. The encoder is not designed to be used in this way.
+               cEncodeBC1Exhaustive = 8192,
+
+               // Try 2 different ways of choosing the initial endpoints.
+               cEncodeBC1TryAllInitialEndponts = 16384,
+               
+               // Same as cEncodeBC1BoundingBox, but implemented using integer math (faster, slightly less quality)
+               cEncodeBC1BoundingBoxInt = 32768,
+               
+               // Try refining the final endpoints by examining nearby colors.
+               cEncodeBC1EndpointSearchRoundsShift = 22,
+               cEncodeBC1EndpointSearchRoundsMask = 1023U << cEncodeBC1EndpointSearchRoundsShift,
+       };
+               
+       const uint32_t MIN_TOTAL_ORDERINGS = 1;
+       const uint32_t MAX_TOTAL_ORDERINGS3 = 32;
+
+#if RGBCX_USE_SMALLER_TABLES
+       const uint32_t MAX_TOTAL_ORDERINGS4 = 32;
+#else
+       const uint32_t MAX_TOTAL_ORDERINGS4 = 128;
+#endif
+       
+       // DEFAULT_TOTAL_ORDERINGS_TO_TRY is around 3x faster than libsquish at slightly higher average quality. 10-16 is a good range to start to compete against libsquish.
+       const uint32_t DEFAULT_TOTAL_ORDERINGS_TO_TRY = 10;
+
+       const uint32_t DEFAULT_TOTAL_ORDERINGS_TO_TRY3 = 1;
+       
+       // Encodes a 4x4 block of RGBX (X=ignored) pixels to BC1 format. 
+       // This is the simplified interface for BC1 encoding, which accepts a level parameter and converts that to the best overall flags.
+       // The pixels are in RGBA format, where R is first in memory. The BC1 encoder completely ignores the alpha channel (i.e. there is no punchthrough alpha support).
+       // This is the recommended function to use for BC1 encoding, becuase it configures the encoder for you in the best possible way (on average).
+       // Note that the 3 color modes won't be used at all until level 5 or higher.
+       // No transparency supported, however if you set use_transparent_texels_for_black to true the encocer will use transparent selectors on very dark/black texels to reduce MSE. 
+       const uint32_t MIN_LEVEL = 0, MAX_LEVEL = 18;
+       void encode_bc1(uint32_t level, void* pDst, const uint8_t* pPixels, bool allow_3color, bool use_transparent_texels_for_black);
+
+       // Low-level interface for BC1 encoding.
+       // Always returns a 4 color block, unless cEncodeBC1Use3ColorBlocksForBlackPixels or cEncodeBC1Use3ColorBlock flags are specified. 
+       // total_orderings_to_try controls the perf. vs. quality tradeoff on 4-color blocks when the cEncodeBC1UseLikelyTotalOrderings flag is used. It must range between [MIN_TOTAL_ORDERINGS, MAX_TOTAL_ORDERINGS4].
+       // total_orderings_to_try3 controls the perf. vs. quality tradeoff on 3-color bocks when the cEncodeBC1UseLikelyTotalOrderings and the cEncodeBC1Use3ColorBlocks flags are used. Valid range is [0,MAX_TOTAL_ORDERINGS3] (0=disabled).
+       void encode_bc1(void* pDst, const uint8_t* pPixels, uint32_t flags = 0, uint32_t total_orderings_to_try = DEFAULT_TOTAL_ORDERINGS_TO_TRY, uint32_t total_orderings_to_try3 = DEFAULT_TOTAL_ORDERINGS_TO_TRY3);
+               
+       // Encodes a 4x4 block of RGBA pixels to BC3 format.
+       // There are two encode_bc3() functions. 
+       // The first is the recommended function, which accepts a level parameter.
+       // The second is a low-level version that allows fine control over BC1 encoding. 
+       void encode_bc3(uint32_t level, void* pDst, const uint8_t* pPixels);
+       void encode_bc3(void* pDst, const uint8_t* pPixels, uint32_t flags = 0, uint32_t total_orderings_to_try = DEFAULT_TOTAL_ORDERINGS_TO_TRY);
+
+       // Encodes a single channel to BC4.
+       // stride is the source pixel stride in bytes.
+       void encode_bc4(void* pDst, const uint8_t* pPixels, uint32_t stride = 4);
+
+       // Encodes two channels to BC5. 
+       // chan0/chan1 control which channels, stride is the source pixel stride in bytes.
+       void encode_bc5(void* pDst, const uint8_t* pPixels, uint32_t chan0 = 0, uint32_t chan1 = 1, uint32_t stride = 4);
+
+       // Decompression functions. 
+       
+       // Returns true if the block uses 3 color punchthrough alpha mode.
+       bool unpack_bc1(const void* pBlock_bits, void* pPixels, bool set_alpha = true, bc1_approx_mode mode = bc1_approx_mode::cBC1Ideal);
+       
+       void unpack_bc4(const void* pBlock_bits, uint8_t* pPixels, uint32_t stride = 4);
+       
+       // Returns true if the block uses 3 color punchthrough alpha mode.
+       bool unpack_bc3(const void* pBlock_bits, void* pPixels, bc1_approx_mode mode = bc1_approx_mode::cBC1Ideal);
+
+       void unpack_bc5(const void* pBlock_bits, void* pPixels, uint32_t chan0 = 0, uint32_t chan1 = 1, uint32_t stride = 4);
+}
+#endif // #ifndef RGBCX_INCLUDE_H
+
+#ifdef RGBCX_IMPLEMENTATION
+namespace rgbcx
+{
+       const uint32_t NUM_UNIQUE_TOTAL_ORDERINGS4 = 969;
+
+       // All total orderings for 16 pixels 2-bit selectors.
+       // BC1 selector order 0, 2, 3, 1 (i.e. the selectors are reordered into linear order).
+       static uint8_t g_unique_total_orders4[NUM_UNIQUE_TOTAL_ORDERINGS4][4] = 
+       {
+               {0,8,2,6},{4,3,9,0},{4,8,1,3},{12,0,3,1},{11,3,2,0},{6,4,6,0},{7,5,0,4},{6,0,8,2},{1,0,0,15},{3,0,8,5},{1,1,13,1},{13,1,2,0},{0,14,1,1},{0,15,1,0},{0,13,0,3},{16,0,0,0},{4,3,4,5},{8,6,0,2},{0,10,0,6},{10,0,4,2},{7,2,1,6},{4,7,5,0},{1,4,7,4},{0,14,2,0},{2,7,2,5},{9,0,5,2},{9,2,2,3},{10,0,5,1},{2,3,7,4},{4,9,0,3},{1,5,0,10},{1,1,6,8},
+               {6,6,4,0},{11,5,0,0},{11,2,0,3},{4,0,10,2},{2,3,10,1},{1,13,1,1},{0,14,0,2},{2,3,3,8},{12,3,1,0},{14,0,0,2},{9,1,3,3},{6,4,0,6},{1,1,5,9},{5,9,0,2},{2,10,1,3},{12,0,0,4},{4,6,6,0},{0,6,4,6},{3,7,4,2},{0,13,3,0},{3,10,0,3},{10,2,1,3},{1,12,1,2},{2,0,13,1},{11,0,5,0},{12,1,3,0},{6,4,5,1},{10,4,2,0},{3,6,1,6},{7,3,6,0},{10,4,0,2},{10,0,2,4},
+               {0,5,9,2},{0,9,3,4},{6,4,2,4},{3,4,7,2},{3,3,5,5},{4,2,9,1},{6,2,8,0},{3,5,3,5},{4,10,1,1},{10,1,3,2},{5,7,0,4},{5,3,7,1},{6,8,1,1},{8,8,0,0},{11,1,0,4},{14,1,0,1},{9,3,2,2},{8,2,1,5},{0,0,2,14},{3,3,9,1},{10,1,5,0},{8,3,1,4},{1,5,8,2},{6,1,9,0},{3,2,1,10},{3,11,1,1},{7,6,3,0},{9,0,3,4},{5,2,5,4},{0,2,3,11},{15,0,0,1},{0,6,6,4},
+               {3,4,9,0},{4,7,0,5},{0,4,4,8},{0,13,2,1},{2,4,1,9},{3,2,5,6},{10,6,0,0},{3,5,6,2},{8,0,4,4},{1,3,6,6},{7,7,0,2},{6,1,4,5},{0,11,1,4},{2,2,8,4},{0,1,2,13},{15,0,1,0},{7,2,6,1},{8,1,7,0},{1,8,4,3},{2,13,1,0},{1,0,7,8},{14,2,0,0},{1,8,1,6},{9,3,3,1},{0,0,7,9},{4,4,1,7},{9,0,6,1},{10,2,4,0},{1,7,3,5},{0,3,8,5},{5,2,4,5},{1,2,5,8},
+               {0,8,7,1},{10,3,2,1},{12,0,4,0},{2,1,4,9},{5,2,2,7},{1,9,3,3},{15,1,0,0},{6,3,4,3},{9,5,0,2},{1,6,9,0},{6,6,0,4},{13,2,1,0},{5,1,8,2},{0,5,11,0},{7,1,0,8},{1,2,12,1},{0,3,3,10},{7,4,2,3},{5,1,4,6},{7,0,3,6},{3,12,0,1},{3,4,5,4},{1,10,0,5},{7,4,3,2},{10,5,0,1},{13,3,0,0},{2,5,4,5},{3,10,1,2},{5,1,2,8},{14,0,1,1},{1,5,4,6},{1,4,5,6},
+               {2,3,11,0},{11,0,4,1},{11,2,2,1},{5,3,8,0},{1,3,10,2},{0,1,13,2},{3,1,4,8},{4,2,4,6},{1,5,6,4},{2,1,11,2},{1,2,9,4},{4,7,3,2},{6,2,5,3},{7,2,2,5},{8,1,4,3},{3,2,8,3},{12,1,0,3},{7,8,1,0},{7,0,2,7},{5,10,0,1},{0,2,14,0},{2,9,3,2},{7,0,0,9},{11,1,4,0},{10,4,1,1},{2,2,9,3},{5,7,2,2},{1,3,1,11},{13,2,0,1},{4,2,8,2},{2,3,1,10},{4,2,5,5},
+               {7,0,7,2},{10,0,0,6},{0,8,5,3},{4,4,0,8},{12,4,0,0},{0,1,14,1},{8,0,1,7},{5,1,5,5},{11,0,3,2},{0,4,1,11},{0,8,8,0},{0,2,5,9},{7,3,2,4},{7,8,0,1},{1,0,3,12},{7,4,5,0},{1,6,7,2},{7,6,1,2},{9,6,1,0},{12,2,0,2},{4,1,6,5},{4,0,1,11},{8,4,4,0},{13,0,1,2},{8,6,2,0},{4,12,0,0},{2,7,5,2},{2,0,5,9},{5,4,5,2},{3,8,5,0},{7,3,3,3},{4,4,8,0},
+               {2,1,3,10},{5,0,1,10},{6,4,3,3},{4,9,1,2},{1,4,0,11},{11,3,1,1},{4,0,12,0},{13,0,0,3},{6,1,6,3},{9,0,4,3},{8,0,0,8},{8,4,0,4},{0,12,1,3},{0,4,10,2},{3,4,8,1},{1,3,8,4},{9,2,5,0},{5,7,4,0},{1,0,11,4},{4,10,0,2},{1,3,12,0},{6,9,0,1},{5,0,9,2},{5,9,2,0},{13,1,0,2},{9,3,4,0},{9,4,0,3},{3,1,12,0},{2,4,3,7},{1,2,13,0},{2,2,4,8},{6,8,0,2},
+               {9,2,1,4},{9,5,1,1},{2,0,4,10},{5,4,0,7},{0,0,6,10},{1,2,0,13},{4,7,2,3},{6,5,5,0},{3,3,1,9},{1,6,1,8},{12,2,1,1},{4,4,5,3},{1,0,6,9},{0,6,10,0},{4,8,3,1},{4,3,2,7},{2,1,7,6},{1,9,1,5},{3,1,3,9},{8,7,1,0},{1,2,3,10},{14,1,1,0},{5,4,4,3},{3,7,0,6},{7,4,1,4},{3,7,5,1},{1,1,0,14},{0,10,3,3},{0,4,3,9},{1,7,7,1},{2,0,10,4},{5,8,0,3},
+               {6,7,3,0},{0,8,4,4},{5,7,3,1},{7,9,0,0},{7,6,2,1},{0,4,5,7},{6,3,5,2},{1,2,1,12},{5,2,0,9},{8,5,0,3},{4,6,1,5},{1,1,7,7},{10,5,1,0},{1,2,8,5},{1,8,2,5},{5,1,0,10},{6,9,1,0},{13,0,2,1},{8,3,5,0},{6,3,6,1},{2,11,3,0},{3,7,3,3},{1,5,2,8},{7,5,2,2},{0,6,7,3},{13,1,1,1},{5,3,4,4},{7,2,7,0},{5,8,3,0},{3,13,0,0},{0,7,9,0},{8,0,3,5},
+               {1,3,7,5},{4,0,2,10},{12,0,1,3},{1,7,6,2},{3,9,0,4},{7,2,0,7},{0,1,7,8},{2,1,8,5},{0,13,1,2},{0,8,1,7},{5,0,11,0},{5,6,2,3},{0,3,0,13},{2,3,4,7},{5,6,3,2},{4,2,10,0},{3,3,7,3},{7,2,5,2},{1,1,11,3},{12,3,0,1},{5,1,1,9},{1,15,0,0},{9,7,0,0},{9,1,2,4},{0,7,3,6},{3,0,13,0},{3,0,11,2},{0,6,5,5},{8,2,2,4},{6,10,0,0},{4,8,4,0},{0,0,3,13},
+               {0,4,12,0},{7,1,6,2},{3,5,0,8},{8,0,6,2},{6,2,3,5},{2,10,0,4},{4,11,0,1},{6,1,5,4},{5,1,3,7},{0,11,3,2},{4,6,0,6},{2,6,0,8},{3,1,7,5},{2,14,0,0},{2,9,2,3},{0,3,4,9},{11,0,1,4},{13,0,3,0},{8,3,0,5},{0,5,3,8},{5,11,0,0},{0,1,4,11},{2,1,9,4},{3,4,4,5},{7,1,2,6},{12,2,2,0},{9,4,1,2},{6,0,2,8},{4,6,2,4},{11,2,3,0},{3,2,2,9},{10,3,1,2},
+               {1,1,2,12},{0,5,2,9},{0,1,11,4},{6,2,4,4},{2,8,2,4},{0,9,4,3},{11,0,2,3},{0,2,11,3},{6,0,7,3},{0,3,6,7},{4,5,5,2},{1,2,6,7},{7,5,1,3},{9,0,2,5},{2,6,4,4},{4,1,9,2},{4,8,2,2},{1,12,3,0},{0,9,6,1},{0,10,6,0},{3,1,5,7},{2,13,0,1},{2,2,1,11},{3,6,0,7},{5,6,5,0},{5,5,4,2},{4,0,3,9},{3,4,1,8},{0,11,2,3},{2,12,1,1},{7,1,3,5},{7,0,9,0},
+               {8,0,8,0},{1,0,2,13},{3,3,10,0},{2,4,4,6},{2,3,8,3},{1,10,5,0},{7,3,0,6},{2,9,0,5},{1,4,6,5},{6,6,3,1},{5,6,0,5},{6,3,0,7},{3,10,2,1},{2,5,5,4},{3,8,4,1},{1,14,0,1},{10,3,3,0},{3,5,7,1},{1,1,3,11},{2,4,0,10},{9,3,1,3},{5,10,1,0},{3,0,6,7},{3,1,9,3},{11,2,1,2},{5,3,3,5},{0,5,1,10},{4,1,11,0},{10,2,0,4},{7,6,0,3},{2,7,0,7},{4,2,2,8},
+               {6,1,7,2},{4,9,2,1},{0,0,8,8},{3,7,2,4},{9,6,0,1},{0,12,4,0},{6,7,1,2},{0,7,2,7},{1,0,10,5},{0,0,14,2},{2,7,3,4},{5,0,0,11},{7,7,1,1},{6,2,7,1},{4,5,3,4},{3,5,1,7},{5,9,1,1},{6,2,1,7},{3,2,0,11},{0,11,0,5},{3,11,2,0},{10,1,4,1},{7,0,4,5},{11,4,0,1},{10,3,0,3},{0,2,4,10},{0,15,0,1},{0,11,5,0},{6,7,2,1},{1,12,2,1},{4,1,3,8},{1,0,13,2},
+               {1,8,5,2},{7,0,1,8},{3,12,1,0},{9,2,4,1},{1,7,4,4},{11,4,1,0},{4,3,8,1},{2,8,4,2},{1,11,3,1},{1,1,4,10},{4,10,2,0},{8,2,5,1},{1,0,9,6},{5,3,2,6},{0,9,7,0},{10,2,2,2},{5,8,1,2},{8,7,0,1},{0,3,12,1},{1,0,1,14},{4,8,0,4},{3,8,0,5},{4,6,5,1},{0,9,5,2},{10,2,3,1},{2,3,9,2},{1,0,12,3},{11,3,0,2},{4,5,2,5},{0,2,12,2},{9,1,0,6},{9,2,0,5},
+               {1,2,7,6},{4,7,4,1},{0,12,2,2},{0,0,0,16},{2,8,3,3},{3,6,2,5},{0,6,3,7},{7,5,4,0},{3,3,3,7},{3,3,0,10},{5,0,6,5},{0,0,10,6},{8,5,3,0},{8,1,5,2},{6,0,9,1},{11,1,2,2},{2,11,2,1},{9,5,2,0},{3,0,4,9},{2,2,12,0},{2,6,6,2},{2,1,13,0},{6,0,5,5},{2,0,14,0},{2,11,1,2},{4,4,7,1},{2,0,11,3},{3,1,1,11},{2,9,4,1},{3,7,6,0},{14,0,2,0},{1,10,4,1},
+               {8,0,7,1},{3,6,5,2},{0,3,11,2},{2,5,6,3},{11,1,3,1},{6,5,3,2},{3,8,1,4},{0,2,7,7},{2,10,2,2},{1,6,2,7},{11,0,0,5},{12,1,1,2},{12,1,2,1},{0,7,1,8},{0,3,9,4},{0,2,1,13},{7,1,4,4},{10,1,0,5},{4,0,8,4},{5,2,7,2},{0,2,0,14},{4,3,7,2},{2,7,1,6},{1,2,2,11},{6,3,3,4},{1,14,1,0},{2,4,6,4},{5,3,6,2},{5,3,5,3},{8,4,1,3},{1,3,0,12},{3,5,2,6},
+               {1,8,7,0},{0,7,4,5},{2,1,6,7},{4,11,1,0},{7,2,4,3},{6,1,3,6},{4,5,4,3},{2,11,0,3},{1,5,7,3},{12,0,2,2},{5,0,4,7},{1,13,0,2},{7,7,2,0},{4,1,7,4},{4,5,0,7},{5,0,5,6},{6,5,4,1},{2,4,2,8},{1,10,1,4},{6,3,1,6},{3,3,8,2},{0,7,7,2},{4,4,2,6},{1,1,8,6},{1,12,0,3},{2,1,12,1},{1,9,2,4},{1,11,0,4},{2,5,2,7},{10,0,3,3},{4,6,3,3},{3,7,1,5},
+               {1,9,0,6},{7,1,7,1},{1,6,5,4},{9,2,3,2},{6,2,2,6},{2,2,2,10},{8,3,3,2},{0,1,8,7},{2,0,8,6},{0,3,1,12},{9,4,2,1},{9,4,3,0},{6,2,6,2},{1,8,0,7},{5,1,10,0},{0,5,5,6},{8,2,4,2},{2,3,2,9},{6,0,3,7},{2,2,6,6},{2,6,2,6},{1,13,2,0},{9,3,0,4},{7,3,5,1},{6,5,2,3},{5,2,6,3},{2,0,12,2},{5,7,1,3},{8,1,3,4},{3,1,10,2},{1,0,15,0},{0,8,0,8},
+               {5,0,7,4},{4,4,6,2},{0,1,0,15},{10,0,1,5},{7,3,4,2},{4,9,3,0},{2,5,7,2},{3,4,2,7},{8,3,2,3},{5,1,6,4},{0,10,2,4},{6,6,1,3},{6,0,0,10},{4,4,3,5},{1,3,9,3},{7,5,3,1},{3,0,7,6},{1,8,6,1},{4,3,0,9},{3,11,0,2},{6,0,6,4},{0,1,3,12},{0,4,2,10},{5,5,6,0},{4,1,4,7},{8,1,6,1},{5,6,4,1},{8,4,2,2},{4,3,1,8},{3,0,2,11},{1,11,4,0},{0,8,3,5},
+               {5,1,7,3},{7,0,8,1},{4,3,5,4},{4,6,4,2},{3,2,4,7},{1,6,3,6},{0,7,8,1},{3,0,1,12},{9,1,4,2},{7,4,0,5},{1,7,0,8},{5,4,1,6},{9,1,5,1},{1,1,9,5},{4,1,1,10},{5,3,0,8},{2,2,5,7},{4,0,0,12},{9,0,7,0},{3,4,0,9},{0,2,6,8},{8,2,0,6},{3,2,6,5},{4,2,6,4},{3,6,4,3},{2,8,6,0},{5,0,3,8},{0,4,0,12},{0,16,0,0},{0,9,2,5},{4,0,11,1},{1,6,4,5},
+               {0,1,6,9},{3,4,6,3},{3,0,10,3},{7,0,6,3},{1,4,9,2},{1,5,3,7},{8,5,2,1},{0,12,0,4},{7,2,3,4},{0,5,6,5},{11,1,1,3},{6,5,0,5},{2,1,5,8},{1,4,11,0},{9,1,1,5},{0,0,13,3},{5,8,2,1},{2,12,0,2},{3,3,6,4},{4,1,10,1},{4,0,5,7},{8,1,0,7},{5,1,9,1},{4,3,3,6},{0,2,2,12},{6,3,2,5},{0,0,12,4},{1,5,1,9},{2,6,5,3},{3,6,3,4},{2,12,2,0},{1,6,8,1},
+               {10,1,1,4},{1,3,4,8},{7,4,4,1},{1,11,1,3},{1,2,10,3},{3,9,3,1},{8,5,1,2},{2,10,4,0},{4,2,0,10},{2,7,6,1},{8,2,3,3},{1,5,5,5},{3,1,0,12},{3,10,3,0},{8,0,5,3},{0,6,8,2},{0,3,13,0},{0,0,16,0},{1,9,4,2},{4,1,8,3},{1,6,6,3},{0,10,5,1},{0,1,12,3},{4,0,6,6},{3,8,3,2},{0,5,4,7},{1,0,14,1},{0,4,6,6},{3,9,1,3},{3,5,8,0},{3,6,6,1},{5,4,7,0},
+               {3,0,12,1},{8,6,1,1},{2,9,5,0},{6,1,1,8},{4,1,2,9},{3,9,4,0},{5,2,9,0},{0,12,3,1},{1,4,10,1},{4,0,7,5},{3,1,2,10},{5,4,2,5},{5,5,5,1},{4,2,3,7},{1,7,5,3},{2,8,0,6},{8,1,2,5},{3,8,2,3},{6,1,2,7},{3,9,2,2},{9,0,0,7},{0,8,6,2},{8,4,3,1},{0,2,8,6},{6,5,1,4},{2,3,5,6},{2,10,3,1},{0,7,0,9},{4,2,7,3},{2,4,8,2},{7,1,1,7},{2,4,7,3},
+               {2,4,10,0},{0,1,10,5},{4,7,1,4},{0,10,4,2},{9,0,1,6},{1,9,6,0},{3,3,4,6},{4,5,7,0},{5,5,2,4},{2,8,1,5},{2,3,6,5},{0,1,1,14},{3,2,3,8},{10,1,2,3},{9,1,6,0},{3,4,3,6},{2,2,0,12},{0,0,9,7},{4,0,9,3},{7,0,5,4},{4,5,6,1},{2,5,1,8},{2,5,9,0},{3,5,4,4},{1,3,11,1},{7,1,5,3},{3,2,7,4},{1,4,2,9},{1,11,2,2},{2,2,3,9},{5,0,10,1},{3,2,11,0},
+               {1,10,3,2},{8,3,4,1},{3,6,7,0},{0,7,5,4},{1,3,3,9},{2,2,10,2},{1,9,5,1},{0,5,0,11},{3,0,3,10},{0,4,8,4},{2,7,7,0},{2,0,2,12},{1,2,11,2},{6,3,7,0},{0,6,2,8},{0,10,1,5},{0,9,0,7},{6,4,4,2},{6,0,1,9},{1,5,10,0},{5,4,6,1},{5,5,3,3},{0,0,4,12},{0,3,2,11},{1,4,1,10},{3,0,9,4},{5,5,0,6},{1,7,8,0},{2,0,3,11},{6,4,1,5},{10,0,6,0},{0,6,0,10},
+               {0,4,11,1},{3,1,6,6},{2,5,8,1},{0,2,10,4},{3,1,11,1},{6,6,2,2},{1,1,10,4},{2,1,2,11},{6,1,8,1},{0,2,13,1},{0,7,6,3},{6,8,2,0},{3,0,0,13},{4,4,4,4},{6,2,0,8},{7,3,1,5},{0,11,4,1},{6,7,0,3},{2,6,3,5},{5,2,1,8},{7,1,8,0},{5,5,1,5},{1,8,3,4},{8,2,6,0},{6,0,10,0},{5,6,1,4},{1,4,4,7},{2,7,4,3},{1,4,8,3},{5,4,3,4},{1,10,2,3},{2,9,1,4},
+               {2,2,11,1},{2,5,0,9},{0,0,1,15},{0,0,11,5},{0,4,7,5},{0,1,15,0},{2,1,0,13},{0,3,10,3},{8,0,2,6},{3,3,2,8},{3,5,5,3},{1,7,1,7},{1,3,2,10},{4,0,4,8},{2,0,9,5},{1,1,1,13},{2,2,7,5},{2,1,10,3},{4,2,1,9},{4,3,6,3},{1,3,5,7},{2,5,3,6},{1,0,8,7},{5,0,2,9},{2,8,5,1},{1,6,0,9},{0,0,5,11},{0,4,9,3},{2,0,7,7},{1,7,2,6},{2,1,1,12},{2,4,9,1},
+               {0,5,7,4},{6,0,4,6},{3,2,10,1},{0,6,1,9},{2,6,1,7},{0,5,8,3},{4,1,0,11},{1,2,4,9},{4,1,5,6},{6,1,0,9},{1,4,3,8},{4,5,1,6},{1,0,5,10},{5,3,1,7},{0,9,1,6},{2,0,1,13},{2,0,6,8},{8,1,1,6},{1,5,9,1},{0,6,9,1},{0,3,5,8},{0,2,9,5},{5,2,8,1},{1,1,14,0},{3,2,9,2},{5,0,8,3},{0,5,10,1},{5,2,3,6},{2,6,7,1},{2,3,0,11},{0,1,9,6},{1,0,4,11},
+               {3,0,5,8},{0,0,15,1},{2,4,5,5},{0,3,7,6},{2,0,0,14},{1,1,12,2},{2,6,8,0},{3,1,8,4},{0,1,5,10}
+       };
+
+       // All total orderings for 16 pixels [0,2] 2-bit selectors.
+       // BC1 selector order: 0, 1, 2
+       // Note this is different from g_unique_total_orders4[], which reorders the selectors into linear order.
+       const uint32_t NUM_UNIQUE_TOTAL_ORDERINGS3 = 153;
+       static uint8_t g_unique_total_orders3[NUM_UNIQUE_TOTAL_ORDERINGS3][3] = 
+       {
+               {6,0,10},{3,6,7},{3,0,13},{13,3,0},{12,4,0},{9,1,6},{2,13,1},{4,7,5},{7,5,4},{9,6,1},{7,4,5},{8,6,2},{16,0,0},{10,6,0},{2,7,7},
+               {0,0,16},{0,3,13},{1,15,0},{0,2,14},{1,4,11},{15,1,0},{1,12,3},{9,2,5},{14,1,1},{8,2,6},{3,3,10},{4,2,10},{14,0,2},{0,14,2},{1,7,8},{6,6,4},
+               {11,5,0},{6,4,6},{11,3,2},{4,3,9},{7,1,8},{10,4,2},{12,1,3},{11,0,5},{9,3,4},{1,0,15},{9,0,7},{2,6,8},{12,2,2},{6,2,8},{6,8,2},{15,0,1},
+               {4,8,4},{0,4,12},{8,5,3},{5,9,2},{11,2,3},{12,3,1},{6,3,7},{1,1,14},{2,9,5},{1,8,7},{4,10,2},{7,7,2},{13,1,2},{0,15,1},{3,2,11},{7,0,9},
+               {4,4,8},{3,8,5},{0,5,11},{13,2,1},{1,10,5},{4,11,1},{3,10,3},{5,10,1},{10,2,4},{0,6,10},{14,2,0},{11,4,1},{3,12,1},{1,13,2},{1,5,10},{5,11,0},
+               {12,0,4},{8,1,7},{6,10,0},{3,13,0},{7,2,7},{0,7,9},{5,8,3},{0,12,4},{11,1,4},{13,0,3},{0,16,0},{5,7,4},{10,3,3},{10,0,6},{0,13,3},{4,6,6},
+               {2,8,6},{2,5,9},{7,8,1},{2,1,13},{2,0,14},{7,3,6},{5,1,10},{3,11,2},{5,4,7},{8,3,5},{10,5,1},{6,9,1},{1,3,12},{4,5,7},{2,2,12},{4,1,11},
+               {0,8,8},{4,12,0},{6,5,5},{8,7,1},{5,5,6},{3,7,6},{7,9,0},{4,9,3},{0,10,6},{8,0,8},{5,3,8},{10,1,5},{6,1,9},{7,6,3},{9,5,2},{0,1,15},
+               {9,7,0},{2,14,0},{3,4,9},{8,4,4},{9,4,3},{0,9,7},{1,9,6},{3,9,4},{5,2,9},{2,3,11},{5,6,5},{1,14,1},{6,7,3},{2,4,10},{2,12,2},{8,8,0},
+               {2,10,4},{4,0,12},{0,11,5},{2,11,3},{1,11,4},{3,5,8},{5,0,11},{3,1,12},{1,2,13},{1,6,9}
+       };
+               
+       // For each total ordering, this table indicates which other total orderings are likely to improve quality using a least squares pass. Each array is sorted by usefulness.
+       static uint16_t g_best_total_orderings4[NUM_UNIQUE_TOTAL_ORDERINGS4][MAX_TOTAL_ORDERINGS4] = 
+       {
+#if RGBCX_USE_SMALLER_TABLES
+               { 202,120,13,318,15,23,403,450,5,51,260,128,77,21,33,494,515,523,4,141,269,1,2,700,137,49,48,102,7,64,753,82  },
+               { 13,141,23,217,115,51,77,2,64,21,0,4,5,317,137,269,202,33,318,7,291,352,9,10,3,180,32,6,365,102,341,349  },
+               { 29,58,262,1,52,74,6,171,5,287,151,334,27,500,75,26,331,223,53,635,220,19,50,45,46,17,14,396,163,409,324,70  },
+               { 40,51,33,453,14,23,62,56,12,196,730,475,153,99,403,775,117,130,585,34,4,17,162,11,139,57,102,38,108,47,123,440  },
+               { 33,23,51,13,102,64,202,128,12,40,15,196,153,10,1,2,77,99,141,0,515,5,117,3,120,403,700,165,22,14,269,453  },
+               { 13,23,51,4,77,141,202,33,115,64,32,128,0,11,177,40,15,102,2,217,7,137,269,21,90,59,515,1,180,403,22,6  },
+               { 26,235,19,47,648,624,78,145,27,112,122,64,444,6,630,453,25,42,65,130,711,85,390,113,416,108,665,29,730,138,644,95  },
+               { 64,141,352,751,217,247,237,437,177,269,86,954,947,875,32,318,95,77,304,92,597,180,232,291,128,864,349,588,372,202,312,1  },
+               { 642,898,180,638,901,341,82,197,10,951,15,515,165,762,700,253,811,753,752,365,143,479,244,569,8,110,351,873,55,31,499,116  },
+               { 221,23,51,125,438,254,13,21,39,49,308,656,0,115,530,159,158,401,30,166,912,386,165,688,518,9,105,627,424,22,421,33  },
+               { 143,31,1,44,197,8,180,125,116,55,13,498,23,341,638,242,93,15,2,141,0,901,752,115,36,206,165,479,338,365,515,762  },
+               { 12,23,51,13,14,15,37,99,515,38,700,117,2,196,134,153,753,64,54,33,128,120,21,0,328,5,139,82,453,719,457,1  },
+               { 13,15,23,515,961,700,457,753,51,115,4,165,197,2,38,569,1,474,0,37,99,719,5,12,629,14,11,3,33,77,64,10  },
+               { 15,515,700,753,1,0,2,4,3,23,134,12,961,5,10,197,11,33,82,120,457,51,165,7,6,341,217,21,77,9,40,180  },
+               { 13,51,23,457,719,961,730,401,165,453,0,117,386,15,134,1,758,153,12,54,515,99,11,2,700,5,753,4,308,33,6,899  },
+               { 134,898,82,117,13,33,77,102,23,260,341,351,120,901,197,153,961,111,196,110,180,457,854,10,450,8,165,40,4,115,0,365  },
+               { 60,18,126,167,35,16,191,71,24,92,121,271,68,107,212,146,118,150,199,7,21,1,9,575,727,5,566,48,0,132,108,273  },
+               { 62,136,129,123,128,41,162,17,249,211,214,789,618,710,38,678,248,507,57,64,152,269,119,3,177,183,597,106,4,179,216,90  },
+               { 403,523,51,475,494,453,817,899,202,23,450,13,421,120,102,730,33,128,4,1,805,5,7,153,757,260,318,196,77,457,326,65  },
+               { 4,59,3,62,12,33,56,193,27,21,102,17,40,77,76,84,32,0,6,123,119,177,128,11,18,611,605,25,13,51,73,210  },
+               { 43,20,319,422,414,945,0,7,819,61,5,376,325,173,804,904,470,693,97,707,14,49,22,104,147,107,95,32,426,1,330,577  },
+               { 13,23,51,2,0,115,4,141,217,33,10,77,1,15,64,180,3,515,7,6,22,102,11,5,40,9,165,700,202,197,317,341  },
+               { 28,49,0,105,1,24,65,159,35,55,95,239,16,2,109,7,9,14,170,320,347,168,424,158,10,301,124,5,67,21,64,36  },
+               { 15,515,700,753,0,1,13,2,117,4,12,10,5,165,457,3,9,134,11,7,6,51,77,64,961,82,33,197,14,341,120,141  },
+               { 7,71,14,149,97,18,60,16,150,92,398,189,140,124,24,273,35,2,69,302,154,68,0,336,517,43,66,28,118,251,230,1  },
+               { 4,102,33,77,40,59,11,624,210,12,128,342,5,503,91,139,64,32,25,494,202,678,416,0,403,275,21,450,196,318,523,177  },
+               { 25,19,42,6,122,813,256,235,85,26,436,53,297,573,680,390,445,63,27,416,80,233,65,73,389,283,45,605,194,17,250,343  },
+               { 402,102,202,128,33,300,403,23,12,77,40,21,342,117,483,99,25,494,6,4,63,32,84,569,139,757,475,318,19,26,196,134  },
+               { 158,9,0,109,39,49,65,22,35,168,55,24,68,124,159,16,185,344,333,154,254,272,175,289,1,577,95,28,105,810,30,169  },
+               { 197,180,115,237,498,165,2,5,287,546,400,3,61,34,509,13,297,80,341,52,45,186,58,881,23,873,468,176,64,17,311,250  },
+               { 120,968,373,260,704,110,450,202,137,318,77,95,269,326,217,717,661,652,851,349,93,1,518,98,827,291,21,177,82,33,848,719  },
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+               { 201,144,206,443,418,203,435,96,335,459,187,1,88,332,330,321,269,934,30,372,822,521,268,326,44,523,382,141,410,264,494,473  },
+               { 31,44,276,201,116,131,284,662,567,144,9,489,98,295,268,434,0,30,137,39,93,1,187,22,219,918,110,299,141,36,224,384  },
+               { 520,478,664,1,264,604,9,167,777,759,411,0,806,724,48,21,101,68,647,936,363,223,118,682,410,18,100,16,252,98,265,13  },
+               { 23,70,21,87,60,75,120,182,163,379,92,18,7,937,71,121,446,132,24,98,931,126,107,77,795,195,115,44,411,146,51,850  },
+               { 39,9,0,737,127,31,846,98,1,827,105,310,371,30,254,100,44,18,395,242,272,101,385,916,836,16,265,131,938,93,166,557  },
+               { 279,20,43,126,107,7,92,16,356,362,60,595,246,359,598,35,0,683,939,653,121,97,125,441,399,392,150,199,48,230,14,649  },
+               { 206,417,93,959,499,728,8,559,120,473,137,141,10,564,31,260,44,450,203,341,253,244,373,116,143,638,268,180,352,110,318,940  },
+               { 259,465,147,132,590,687,534,199,581,146,941,427,107,640,279,178,121,5,195,150,522,955,198,35,786,929,798,142,1,21,325,626  },
+               { 523,15,120,450,202,515,403,51,817,700,13,753,23,457,33,899,128,64,730,102,494,342,115,719,453,196,49,99,318,421,308,5  },
+               { 141,559,10,244,365,564,661,180,253,143,752,110,55,317,533,341,901,93,373,206,535,160,82,922,260,36,531,964,352,332,261,197  },
+               { 219,258,98,127,276,964,943,137,843,535,201,935,131,860,261,295,284,567,206,44,116,31,253,492,203,332,160,615,36,93,55,692  },
+               { 0,319,422,207,945,693,577,887,32,804,95,344,104,904,61,20,5,43,7,725,113,510,306,102,49,263,153,426,33,83,22,9  },
+               { 1,22,0,5,12,2,36,21,28,86,49,105,9,10,23,13,141,95,31,55,128,37,51,4,83,202,3,64,96,7,32,44  },
+               { 15,515,13,700,1,0,753,2,23,3,4,5,51,10,115,197,6,33,12,9,165,7,8,77,11,961,180,269,141,22,120,457  },
+               { 15,1,23,120,77,13,515,51,141,202,700,180,110,137,260,753,326,5,128,102,0,21,2,165,269,33,197,450,318,217,93,115  },
+               { 15,515,1,700,0,753,13,2,23,180,51,5,120,4,9,115,197,12,7,165,21,33,6,82,3,8,523,901,31,141,457,260  },
+               { 16,18,24,7,92,35,60,75,9,13,71,14,0,108,50,21,126,121,1,140,23,5,132,146,2,12,128,10,64,141,70,87  },
+               { 180,341,901,15,515,1,365,700,0,2,197,753,115,4,10,13,752,5,3,8,165,317,141,23,143,873,44,31,569,55,93,6  },
+               { 9,0,175,35,101,28,39,67,68,1,65,83,30,69,364,336,22,114,55,124,194,158,100,289,252,166,64,345,103,36,50,88  },
+               { 64,165,180,197,115,247,217,237,21,13,32,316,22,141,352,72,288,304,95,225,76,391,386,16,468,90,49,35,365,640,372,23  },
+               { 15,515,700,13,753,1,0,2,23,4,5,3,115,51,141,197,12,10,180,961,7,9,21,33,217,6,8,165,457,11,77,341  },
+               { 132,121,199,146,60,279,493,640,407,598,126,195,534,581,955,590,107,5,150,35,522,49,259,16,18,360,156,0,147,362,21,167  },
+               { 0,1,28,9,22,5,36,12,65,24,67,96,2,83,18,50,114,55,21,16,7,10,23,14,13,160,137,51,48,218,103,69  },
+               { 93,120,957,77,30,968,459,110,137,160,613,102,202,352,373,141,31,372,217,330,190,318,269,260,203,44,28,473,228,177,863,704  },
+               { 15,515,700,0,753,1,13,23,2,51,5,9,120,82,4,7,901,197,10,8,260,180,341,12,33,6,3,523,165,102,115,141  },
+               { 206,417,8,141,499,44,244,93,31,10,137,253,559,116,728,144,120,564,269,638,203,352,143,260,341,752,268,717,951,180,160,110  },
+               { 530,254,228,1,96,21,406,39,827,31,669,840,613,829,137,679,166,98,23,51,960,438,131,93,48,224,219,317,310,36,876,190  },
+               { 15,515,700,753,13,457,0,197,719,1,165,82,23,8,120,730,2,10,12,180,134,5,9,141,260,4,351,51,115,3,341,899  },
+               { 0,16,68,9,24,28,18,35,252,109,39,419,124,158,154,55,101,71,22,118,60,7,49,65,333,14,1,10,329,364,677,346  },
+               { 1,15,13,23,515,51,120,0,700,180,2,165,5,753,141,197,21,33,202,102,260,4,9,12,7,326,137,450,115,6,82,110  },
+               { 535,253,352,564,110,365,82,180,341,10,854,533,55,898,244,901,873,141,752,143,642,559,498,317,36,951,115,964,638,282,661,197  },
+               { 31,44,125,338,116,64,242,36,1,10,55,22,456,237,180,13,299,164,506,86,23,165,558,143,0,762,492,479,844,546,93,8  },
+               { 13,23,4,1,202,2,0,51,115,77,141,180,5,15,217,3,33,11,515,317,9,10,102,21,700,341,365,318,269,64,32,128  },
+               { 9,39,0,166,68,101,28,364,30,158,562,35,175,65,333,154,49,404,706,124,21,252,274,168,190,289,100,570,16,1,310,346  },
+               { 15,515,700,753,341,13,0,23,1,33,141,4,260,82,77,51,351,180,9,5,115,137,10,217,11,120,102,40,349,269,202,854  }
+#else
+               #include "rgbcx_table4.h"
+#endif
+       };
+
+       static uint8_t g_best_total_orderings3[NUM_UNIQUE_TOTAL_ORDERINGS3][32] = 
+       {
+               { 12,1,3,5,27,2,4,38,8,7,16,18,6,10,41,79,40,23,46,9,20,88,22,37,14,19,24,126,99,119,35,11  },
+               { 7,64,116,14,94,30,8,42,1,108,47,55,137,10,134,95,96,115,69,32,63,29,90,113,11,148,16,103,19,9,34,25  },
+               { 12,1,0,5,3,7,4,27,8,6,38,40,41,16,18,46,9,10,20,23,79,62,14,22,88,99,37,126,92,19,120,11  },
+               { 16,88,27,18,46,48,126,107,79,19,59,38,37,65,23,66,0,2,3,43,12,151,28,25,5,87,72,40,1,20,52,92  },
+               { 79,48,88,16,27,65,18,38,46,19,37,4,72,33,126,41,52,0,12,92,5,1,2,107,3,77,23,91,43,51,22,74  },
+               { 1,8,41,122,10,22,2,0,87,24,37,120,38,7,39,4,5,3,9,92,62,59,23,16,104,11,27,79,19,26,25,32  },
+               { 2,76,99,28,40,86,93,21,138,60,6,0,17,128,145,119,98,144,141,82,147,54,67,75,5,12,27,132,146,1,38,14  },
+               { 47,7,64,90,1,118,116,85,57,14,30,94,50,45,137,134,8,42,69,139,55,68,58,108,95,29,10,115,0,32,2,11  },
+               { 49,8,10,30,124,11,32,113,130,58,125,9,100,53,104,115,131,103,24,7,1,39,45,36,139,0,137,22,90,44,114,105  },
+               { 9,38,72,125,49,41,84,11,13,5,27,0,16,92,8,2,65,105,10,18,48,29,127,131,36,14,1,46,111,79,130,12  },
+               { 130,8,10,100,104,131,49,32,53,39,30,36,113,24,11,22,124,44,83,58,7,103,1,4,9,125,5,0,91,33,115,74  },
+               { 114,11,58,8,120,49,9,124,142,111,41,30,10,0,97,130,62,84,38,5,72,125,92,127,100,27,139,113,13,132,32,1  },
+               { 60,46,28,27,40,20,0,17,18,2,126,16,6,38,86,23,79,54,1,93,5,88,41,14,21,111,7,48,3,84,72,62  },
+               { 72,92,38,65,84,48,41,79,27,16,29,111,88,5,18,46,1,0,152,14,37,19,77,42,132,7,22,13,119,56,12,2  },
+               { 7,55,1,95,29,56,64,116,143,8,14,30,47,94,152,90,65,67,10,133,42,72,146,84,16,48,6,0,25,108,77,21  },
+               { 27,23,20,5,0,79,38,2,3,1,59,46,4,41,33,86,37,87,88,92,7,126,43,8,22,152,151,150,149,148,147,146  },
+               { 12,0,1,2,7,6,3,5,28,4,8,14,60,40,17,19,21,86,126,93,10,18,9,29,48,99,65,25,84,119,72,41  },
+               { 60,40,99,2,54,12,0,1,19,28,98,93,6,138,21,5,27,17,151,14,76,46,16,18,38,29,86,144,107,7,25,41  },
+               { 12,0,1,2,3,5,6,7,4,28,8,60,14,40,16,17,21,10,19,9,86,38,126,41,93,27,29,48,62,84,79,99  },
+               { 0,1,2,10,5,8,3,25,4,29,32,34,63,7,77,26,16,48,65,56,14,22,129,103,72,24,18,152,140,53,96,42  },
+               { 46,126,18,54,12,16,1,0,5,2,27,98,20,23,6,3,88,48,28,7,19,8,4,60,151,38,37,21,79,14,65,40  },
+               { 76,6,141,86,119,2,138,67,28,145,0,93,17,1,40,60,146,99,147,14,21,144,132,7,5,29,55,27,16,75,19,12  },
+               { 71,5,51,39,22,80,0,43,10,122,8,62,41,24,104,87,35,37,2,91,33,120,36,38,1,131,9,100,130,66,3,4  },
+               { 126,18,46,27,20,16,88,23,12,79,54,59,48,0,73,1,37,151,5,19,28,38,2,66,60,3,65,98,14,26,6,43  },
+               { 22,10,8,5,0,71,35,80,104,39,24,51,100,1,62,32,2,130,11,41,7,9,53,43,49,83,122,120,30,44,37,38  },
+               { 1,34,14,129,53,63,42,26,121,148,7,44,96,10,0,24,100,32,64,116,140,22,5,19,29,103,135,108,8,61,39,83  },
+               { 1,7,34,63,44,25,135,14,24,108,22,0,83,94,5,129,35,101,47,121,2,19,42,53,6,110,103,8,148,10,16,123  },
+               { 12,28,16,60,18,1,6,21,14,0,86,19,2,48,93,17,38,29,7,5,65,126,46,72,41,79,84,119,40,56,54,88  },
+               { 0,2,12,27,5,46,38,40,41,79,88,99,3,23,1,62,20,4,22,37,92,35,18,8,16,24,10,60,7,120,98,54  },
+               { 1,7,14,56,8,0,84,67,10,2,133,72,42,111,5,30,21,4,9,3,25,94,16,116,47,11,65,18,132,90,55,64  },
+               { 30,8,124,139,45,11,58,90,113,137,7,115,10,32,1,49,94,85,9,47,108,103,0,97,63,14,50,114,53,106,100,25  },
+               { 65,38,48,27,16,79,72,18,88,19,46,77,84,92,37,41,0,29,1,14,12,111,2,5,31,36,87,74,105,40,28,51  },
+               { 10,8,30,113,130,100,53,32,115,103,104,7,1,121,39,49,131,44,24,36,63,137,34,45,22,90,108,83,26,11,94,139  },
+               { 51,52,43,33,5,74,16,37,71,91,38,3,36,87,48,22,4,0,122,41,39,18,66,27,79,24,65,88,59,23,62,92  },
+               { 1,7,63,53,108,121,94,44,103,100,14,10,129,47,32,26,24,25,148,42,135,22,0,61,83,8,39,104,5,64,115,34  },
+               { 1,8,10,7,5,0,80,32,62,2,24,44,53,83,9,41,30,22,100,11,14,25,120,4,26,6,3,16,122,34,19,35  },
+               { 74,4,36,48,33,91,39,79,22,16,65,5,131,38,24,71,27,52,0,105,51,18,88,104,3,31,10,37,72,19,41,130  },
+               { 59,43,38,79,23,27,92,51,0,16,46,5,18,88,41,37,66,3,87,20,48,2,122,4,22,12,1,126,19,65,33,24  },
+               { 12,28,1,27,0,16,2,46,65,60,21,3,5,18,6,19,48,14,4,7,79,88,86,29,22,72,93,40,23,8,17,41  },
+               { 22,91,39,33,24,71,5,131,36,10,51,0,130,8,104,2,35,125,9,43,52,49,83,80,100,41,122,3,37,38,4,16  },
+               { 12,0,1,2,5,3,4,8,7,27,18,38,10,6,16,46,9,20,41,23,126,79,22,14,19,99,88,54,37,48,62,35  },
+               { 12,27,1,2,3,0,46,4,38,16,8,28,7,79,18,5,84,6,88,10,14,21,23,20,40,22,60,19,9,29,72,65  },
+               { 1,14,7,55,95,29,8,94,30,56,10,108,77,116,152,64,32,48,63,42,143,148,16,25,137,65,11,0,115,9,19,72  },
+               { 37,79,66,38,16,52,48,59,43,27,87,33,41,4,23,51,3,5,88,18,92,46,73,122,22,71,20,0,65,19,2,120  },
+               { 24,32,83,22,53,1,8,10,7,30,35,5,103,0,100,101,121,113,34,123,63,2,44,25,71,115,80,14,26,108,51,39  },
+               { 97,45,111,58,85,139,0,90,47,7,120,106,142,30,50,132,41,62,84,1,119,114,14,56,117,8,38,29,2,64,116,5  },
+               { 12,28,16,18,1,60,6,14,2,21,0,86,126,19,48,93,7,27,17,29,5,65,54,38,72,79,84,88,119,145,8,111  },
+               { 118,47,64,116,57,85,7,14,50,1,42,0,45,68,86,69,2,111,134,28,90,55,16,29,56,48,84,144,60,30,112,41  },
+               { 12,1,2,0,7,6,28,5,3,4,8,14,60,21,18,40,17,86,10,9,16,29,19,93,126,79,38,84,72,27,111,119  },
+               { 11,8,49,130,10,125,9,124,100,114,131,30,58,104,32,39,24,113,36,105,0,41,22,120,5,53,111,38,142,44,83,35  },
+               { 50,70,47,118,85,57,106,0,45,7,64,90,81,14,2,134,28,62,86,55,69,1,78,119,68,56,18,67,16,60,29,21  },
+               { 43,37,33,87,51,41,66,5,122,38,22,59,92,0,23,91,27,16,71,79,18,52,120,4,3,24,46,20,73,39,62,36  },
+               { 79,48,4,16,27,88,43,33,18,38,65,37,46,3,19,51,52,22,66,87,74,5,41,91,23,59,0,71,122,72,20,92  },
+               { 32,100,10,8,30,104,24,44,39,113,83,103,1,7,22,53,115,63,135,121,26,35,34,5,0,108,137,90,91,45,2,130  },
+               { 0,1,2,5,16,12,6,7,14,3,19,18,29,20,4,21,40,8,17,35,23,48,126,22,25,56,26,10,98,27,38,65  },
+               { 143,67,56,146,1,7,133,55,64,141,134,69,6,47,14,29,84,21,111,147,57,16,95,72,118,132,50,0,2,18,119,42  },
+               { 1,7,67,14,133,111,8,84,0,21,2,47,64,132,55,10,95,147,119,42,16,5,72,56,4,3,6,29,9,25,18,30  },
+               { 68,57,69,112,144,86,102,2,134,55,0,70,118,64,75,47,14,28,93,143,67,7,50,149,1,21,29,56,119,95,60,78  },
+               { 58,97,114,30,124,45,11,139,8,90,0,142,7,10,41,113,84,62,49,111,85,1,9,5,137,120,32,14,2,117,47,38  },
+               { 23,66,18,79,38,20,43,27,16,88,46,59,126,37,87,12,73,92,3,5,48,0,19,54,2,51,28,1,41,65,122,22  },
+               { 0,12,2,27,5,40,46,38,1,41,3,79,88,23,99,4,20,62,22,54,92,18,8,37,16,35,10,7,19,120,144,24  },
+               { 1,14,25,26,0,7,44,34,129,42,24,5,135,22,19,148,6,96,83,2,29,16,63,35,101,64,140,136,116,110,3,10  },
+               { 12,1,2,27,3,4,38,5,7,8,18,16,46,6,0,40,41,10,79,23,88,9,20,22,14,19,37,92,48,126,28,21  },
+               { 7,1,10,32,108,103,94,47,8,53,25,14,34,115,100,129,121,130,148,42,64,116,63,26,44,0,24,30,113,4,104,22  },
+               { 47,134,7,14,55,69,64,95,1,29,85,118,56,116,45,57,102,143,50,90,42,30,16,94,0,8,67,75,133,2,18,48  },
+               { 12,1,2,0,7,6,28,8,14,5,3,4,40,21,17,18,60,86,16,93,126,10,9,29,99,38,119,25,19,54,27,84  },
+               { 59,16,27,18,23,88,79,37,46,66,38,20,73,126,3,43,48,87,92,51,41,12,19,5,52,107,65,0,151,122,54,2  },
+               { 1,21,147,7,119,14,76,132,55,0,86,145,2,6,69,67,16,143,111,138,17,28,29,60,18,93,8,19,40,56,84,5  },
+               { 144,86,112,2,68,102,69,0,149,93,75,28,57,55,145,60,21,67,99,134,143,40,146,119,82,110,62,6,29,26,78,14  },
+               { 102,57,55,69,143,75,146,67,56,68,134,2,29,141,0,21,6,14,133,118,64,1,7,95,47,84,111,28,147,82,72,119  },
+               { 0,70,57,119,50,145,2,86,28,118,69,78,149,47,60,68,67,55,93,81,134,21,14,62,64,7,5,1,132,85,41,16  },
+               { 51,5,43,71,122,87,41,37,91,39,0,22,33,36,38,24,66,120,62,2,80,16,92,10,59,4,27,23,35,79,8,3  },
+               { 12,1,2,0,7,6,28,5,8,14,3,21,40,4,60,17,86,18,16,93,10,9,126,119,99,29,19,41,38,27,25,92  },
+               { 27,18,46,126,23,16,88,79,20,151,59,73,48,38,0,54,12,2,37,1,19,5,28,60,66,41,3,109,86,65,40,6  },
+               { 48,79,4,33,16,74,65,38,88,27,91,52,18,36,22,19,46,0,37,3,51,5,71,39,72,43,24,41,92,87,2,10  },
+               { 86,2,144,93,28,112,141,6,102,21,99,60,75,0,68,82,69,146,67,149,55,40,145,76,111,147,56,119,110,143,26,132  },
+               { 6,138,2,99,86,17,40,93,28,21,145,141,0,60,119,147,128,76,67,54,1,12,5,27,144,14,38,98,146,41,29,19  },
+               { 1,8,0,10,2,29,7,5,3,56,4,25,14,152,63,32,65,72,96,42,34,108,48,9,26,16,84,103,67,148,22,129  },
+               { 149,145,0,86,2,28,93,144,62,60,119,101,21,41,5,35,78,99,26,40,12,68,57,67,110,120,69,18,55,76,132,70  },
+               { 12,28,16,1,48,19,6,60,2,14,18,21,0,27,46,65,86,29,5,7,72,93,40,3,17,84,56,88,126,4,38,8  },
+               { 1,8,5,10,7,24,2,62,0,41,22,122,120,9,4,3,32,87,11,37,38,83,100,44,25,104,16,26,39,80,14,6  },
+               { 0,119,62,86,145,149,28,132,93,2,120,67,60,41,35,5,144,21,123,38,111,81,84,56,12,44,24,50,92,55,40,22  },
+               { 2,93,99,28,40,144,60,0,86,150,76,21,149,98,6,25,1,61,82,26,12,5,54,141,7,18,145,16,27,138,110,38  },
+               { 24,8,10,22,32,35,100,5,1,53,0,7,71,80,30,123,83,104,51,11,2,39,44,113,9,62,25,103,34,101,43,41  },
+               { 12,1,2,0,7,6,28,5,40,60,8,16,3,18,14,4,86,21,17,93,41,10,9,99,27,119,38,19,126,22,48,145  },
+               { 45,47,50,7,85,90,97,1,64,139,116,118,30,58,14,106,70,111,0,57,94,42,137,142,29,120,8,56,18,134,84,41  },
+               { 12,0,2,5,27,38,1,46,41,40,79,144,3,22,88,23,28,60,99,62,6,24,26,7,4,16,10,35,37,18,14,20  },
+               { 37,38,59,92,0,5,23,51,79,41,27,22,2,3,87,16,46,4,1,43,20,33,18,88,24,71,8,10,48,19,126,122  },
+               { 12,28,16,60,1,18,6,21,19,14,48,0,2,86,93,5,46,29,17,27,65,7,3,72,38,126,119,40,84,37,56,4  },
+               { 0,2,5,1,16,6,27,28,18,38,60,7,14,21,46,40,86,41,19,48,93,8,3,79,22,4,10,37,62,23,24,111  },
+               { 85,7,90,30,47,139,45,50,94,58,137,1,8,64,14,116,118,115,113,11,124,108,0,10,97,57,32,70,42,106,29,114  },
+               { 33,36,22,71,51,5,91,39,0,52,43,24,131,74,16,37,38,122,41,3,87,48,4,104,35,80,10,2,105,62,27,18  },
+               { 12,1,27,2,0,16,3,28,46,18,4,6,5,72,21,79,38,7,14,60,88,8,65,19,48,29,23,40,22,20,86,126  },
+               { 0,12,2,27,5,38,46,41,1,40,79,3,88,23,22,99,20,37,62,4,18,6,16,35,60,28,24,7,92,8,14,10  },
+               { 7,47,1,30,137,8,116,94,90,64,14,115,108,118,57,10,148,113,42,85,32,11,63,50,103,45,124,134,55,9,69,34  },
+               { 55,7,1,29,56,143,64,47,67,133,14,146,95,72,84,8,116,111,6,134,141,21,65,0,69,30,16,45,85,42,50,10  },
+               { 14,1,42,8,10,29,108,63,55,148,95,32,7,19,25,115,103,34,56,129,77,0,16,152,94,30,113,26,2,5,48,4  },
+               { 111,120,142,97,58,0,41,45,62,132,114,84,139,30,5,8,38,2,7,85,119,90,117,1,124,11,56,47,28,27,35,72  },
+               { 1,0,14,2,6,5,16,19,7,29,42,18,3,25,12,35,21,8,26,17,40,4,20,48,109,99,22,96,55,101,10,61  },
+               { 12,0,1,5,3,2,4,7,27,8,38,6,40,18,16,10,20,46,9,41,23,22,79,14,62,19,37,126,88,11,92,48  },
+               { 10,8,104,39,24,32,22,83,44,100,30,130,53,91,113,5,11,1,35,33,7,49,0,2,103,71,36,124,9,80,131,34  },
+               { 1,7,0,14,8,34,5,25,35,26,6,63,10,123,2,16,103,19,44,32,135,121,108,80,62,30,115,94,149,144,53,18  },
+               { 75,68,146,141,102,67,2,21,6,57,69,143,0,55,82,86,28,144,147,29,93,112,56,119,133,14,76,60,84,134,111,145  },
+               { 10,32,115,7,8,53,1,108,30,113,94,137,100,63,90,34,130,103,121,47,44,25,104,39,24,26,85,14,49,36,22,131  },
+               { 39,24,10,22,8,130,91,104,83,49,5,33,100,11,0,35,32,131,71,36,9,44,53,2,80,51,30,1,41,7,43,62  },
+               { 38,36,65,105,27,72,31,79,41,131,5,48,125,39,0,16,92,46,22,13,18,84,24,37,88,2,33,74,91,71,130,49  },
+               { 0,106,62,50,45,119,85,81,132,28,2,86,41,47,38,60,35,117,5,29,7,30,145,90,55,70,14,111,18,67,93,56  },
+               { 0,2,5,1,3,25,19,26,4,34,29,10,22,16,8,7,24,14,48,65,53,18,6,77,44,56,72,61,121,21,136,40  },
+               { 7,1,94,8,47,115,10,32,113,103,30,108,137,63,14,64,116,148,129,42,90,25,34,118,53,57,11,49,85,9,96,50  },
+               { 14,0,1,26,19,5,42,2,25,24,29,22,6,44,61,16,7,96,136,3,140,34,35,55,135,18,48,77,83,4,8,10  },
+               { 1,7,14,0,25,6,34,5,26,16,63,2,19,8,35,101,108,29,94,10,18,42,123,144,129,47,61,21,3,62,149,4  },
+               { 12,0,2,1,28,5,6,120,7,60,40,16,18,86,27,14,21,93,8,62,41,38,3,17,4,119,99,48,19,126,10,9  },
+               { 86,144,93,2,28,149,0,60,99,112,110,145,40,21,102,26,75,62,69,1,12,101,119,25,76,67,7,68,55,5,6,14  },
+               { 8,30,10,32,113,49,115,137,124,103,45,90,7,139,11,1,58,53,130,94,108,100,9,63,85,125,34,47,0,24,44,104  },
+               { 120,142,111,41,58,114,97,0,11,62,84,124,5,30,8,38,132,127,27,139,92,10,72,45,49,9,28,2,29,56,16,1  },
+               { 8,113,30,137,7,32,10,90,94,115,1,103,108,63,47,85,49,53,11,45,34,50,14,25,9,124,100,130,139,121,42,26  },
+               { 64,7,14,47,134,55,1,42,95,69,116,90,94,30,8,29,56,137,45,108,85,10,57,16,102,143,118,19,63,32,11,50  },
+               { 62,132,0,119,120,41,111,86,35,28,5,84,56,38,2,93,145,60,67,12,92,27,29,72,55,117,21,24,133,149,22,45  },
+               { 57,68,69,118,134,64,50,47,55,14,7,2,102,144,0,112,70,86,85,1,95,29,116,143,42,75,16,56,28,45,21,48  },
+               { 0,12,2,1,5,28,6,40,60,27,7,38,16,14,86,18,93,41,62,46,99,35,8,23,3,17,22,21,10,19,79,20  },
+               { 12,1,2,27,16,3,38,111,4,0,18,5,7,46,40,8,79,6,14,28,88,10,48,41,19,84,21,9,22,23,20,72  },
+               { 53,103,32,7,1,100,22,63,71,44,10,115,108,24,92,104,26,30,122,94,8,39,83,34,137,135,90,91,121,5,87,47  },
+               { 87,37,41,0,22,38,2,92,1,24,4,8,3,59,10,5,39,23,71,79,122,27,16,46,33,7,91,20,18,51,9,120  },
+               { 1,7,8,10,0,5,35,32,53,44,14,30,2,80,25,34,6,62,26,103,16,19,63,9,149,24,121,41,22,11,113,83  },
+               { 11,58,8,30,124,49,10,113,9,114,139,45,97,32,7,137,90,1,0,130,115,125,100,24,5,94,53,41,14,13,35,38  },
+               { 125,105,9,36,131,49,8,130,39,11,10,5,22,38,41,104,0,31,13,24,27,16,2,72,65,91,48,32,84,18,100,74  },
+               { 12,1,0,2,6,3,7,5,4,8,14,28,16,60,18,10,21,17,19,9,40,27,86,93,29,38,54,11,25,48,46,41  },
+               { 84,41,38,72,92,29,111,5,65,120,79,0,27,56,48,14,132,16,119,22,86,88,46,28,62,12,1,2,93,18,24,127  },
+               { 99,28,40,60,2,93,138,0,98,17,86,54,76,12,27,1,21,144,128,38,5,14,46,18,25,16,109,6,41,145,7,29  },
+               { 1,63,10,32,148,14,103,34,42,7,8,108,116,53,64,96,25,121,26,94,140,0,29,19,55,24,100,136,5,4,44,115  },
+               { 131,100,130,49,10,8,36,104,39,0,48,41,11,38,4,24,27,22,16,44,79,5,33,2,53,9,125,74,91,120,32,83  },
+               { 36,39,131,74,4,91,22,33,125,104,130,48,10,24,16,5,49,8,100,105,79,0,9,65,71,2,18,83,31,11,19,44  },
+               { 0,12,2,1,6,5,7,28,40,60,16,14,18,62,86,27,93,8,17,38,21,41,35,99,3,19,10,23,22,4,9,48  },
+               { 1,7,67,14,21,147,111,55,132,119,0,8,2,76,64,16,47,84,6,18,86,95,145,10,42,29,133,5,56,134,17,72  },
+               { 69,55,47,134,102,143,7,57,118,95,14,64,29,56,1,50,75,67,146,2,0,133,68,16,21,6,141,85,116,18,72,65  },
+               { 1,44,7,24,83,63,34,103,22,121,53,32,25,35,0,115,108,5,14,8,10,101,94,30,2,123,110,26,137,47,90,19  },
+               { 14,1,25,42,34,0,26,96,19,29,140,5,53,10,2,121,3,24,44,22,55,77,129,7,63,16,8,4,6,61,100,48  },
+               { 30,90,7,8,137,94,85,1,47,113,115,108,45,139,124,11,10,32,50,58,103,14,63,64,9,116,49,42,25,148,0,53  },
+               { 40,99,2,60,28,17,0,54,93,98,86,138,6,12,21,76,1,5,27,144,128,38,19,46,14,41,145,7,16,67,3,109  },
+               { 45,58,30,139,90,7,85,137,97,8,124,47,1,11,106,114,50,94,0,113,10,115,14,32,9,64,108,41,49,29,62,116  },
+               { 14,42,10,1,63,96,32,25,34,8,129,29,0,103,55,19,26,53,77,5,95,2,4,7,3,16,148,56,18,24,121,108  },
+               { 21,2,75,86,6,76,144,28,119,99,93,147,141,67,102,145,60,132,146,128,0,82,40,138,55,111,143,17,133,112,69,14  },
+               { 111,120,41,62,84,132,0,5,38,119,56,92,72,142,27,28,29,35,58,80,2,86,65,79,12,14,1,24,145,16,21,48  },
+               { 146,67,141,69,133,21,6,143,57,55,111,147,56,1,14,132,7,2,134,102,0,119,29,84,76,64,86,72,28,68,47,75  },
+               { 12,1,0,5,27,3,7,4,38,8,6,41,16,40,46,10,18,79,2,9,23,86,20,22,62,14,37,88,92,19,24,11  },
+               { 0,12,2,1,27,5,38,28,60,6,40,7,16,46,18,14,41,99,93,62,3,79,86,23,149,8,22,35,88,17,19,10  },
+               { 141,6,21,67,147,102,146,2,76,119,132,69,55,111,86,75,28,133,143,0,1,145,14,128,56,99,17,60,29,93,84,68  },
+               { 21,76,1,119,86,145,2,0,14,7,6,138,146,55,17,28,132,93,67,40,60,143,29,147,111,16,69,141,5,56,19,133  },
+               { 1,8,108,14,7,116,64,42,10,63,94,32,115,103,113,96,30,34,55,47,95,148,29,140,129,25,134,53,69,26,19,11  },
+               { 12,1,3,5,4,2,0,7,8,38,27,16,18,6,10,20,41,40,79,46,9,23,22,88,92,37,14,24,62,19,48,99  },
+               { 1,14,7,0,6,25,5,16,19,2,42,26,29,35,61,8,18,129,101,21,3,110,34,148,96,10,17,4,22,40,12,20  },
+               { 0,2,5,1,3,19,22,26,16,24,29,7,14,6,4,25,18,44,8,48,12,61,20,21,10,35,65,56,23,40,17,107  },
+               { 1,7,8,29,56,0,10,14,2,42,72,5,4,65,3,30,84,94,67,9,25,133,111,11,32,108,16,63,21,96,26,48  }
+       };
+
+       static inline uint32_t iabs(int32_t i) { return (i < 0) ? static_cast<uint32_t>(-i) : static_cast<uint32_t>(i); }
+       static inline uint64_t iabs(int64_t i) { return (i < 0) ? static_cast<uint64_t>(-i) : static_cast<uint64_t>(i); }
+
+       static inline uint8_t to_5(uint32_t v) { v = v * 31 + 128; return (uint8_t)((v + (v >> 8)) >> 8); }
+       static inline uint8_t to_6(uint32_t v) { v = v * 63 + 128; return (uint8_t)((v + (v >> 8)) >> 8); }
+
+       template <typename S> inline S maximum(S a, S b) { return (a > b) ? a : b; }
+       template <typename S> inline S maximum(S a, S b, S c) { return maximum(maximum(a, b), c); }
+       template <typename S> inline S maximum(S a, S b, S c, S d) { return maximum(maximum(maximum(a, b), c), d); }
+       
+       template <typename S> inline S minimum(S a, S b) {      return (a < b) ? a : b; }
+       template <typename S> inline S minimum(S a, S b, S c) { return minimum(minimum(a, b), c); }
+       template <typename S> inline S minimum(S a, S b, S c, S d) { return minimum(minimum(minimum(a, b), c), d); }
+
+       template<typename T> inline T square(T a) { return a * a; }
+
+       static inline float clampf(float value, float low, float high) { if (value < low) value = low; else if (value > high) value = high;     return value; }
+       static inline uint8_t clamp255(int32_t i) { return (uint8_t)((i & 0xFFFFFF00U) ? (~(i >> 31)) : i); }
+
+       template <typename S> inline S clamp(S value, S low, S high) { return (value < low) ? low : ((value > high) ? high : value); }
+       static inline int32_t clampi(int32_t value, int32_t low, int32_t high) { if (value < low) value = low; else if (value > high) value = high;     return value; }
+
+       static inline int squarei(int a) { return a * a; }
+       static inline int absi(int a) { return (a < 0) ? -a : a; }
+
+       template<typename F> inline F lerp(F a, F b, F s) { return a + (b - a) * s; }
+
+       enum class eNoClamp { cNoClamp };
+
+       struct color32
+       {
+               union
+               {
+                       struct
+                       {
+                               uint8_t r;
+                               uint8_t g;
+                               uint8_t b;
+                               uint8_t a;
+                       };
+
+                       uint8_t c[4];
+                       
+                       uint32_t m;
+               };
+
+               color32() { }
+
+               color32(uint32_t vr, uint32_t vg, uint32_t vb, uint32_t va) { set(vr, vg, vb, va); }
+               color32(eNoClamp unused, uint32_t vr, uint32_t vg, uint32_t vb, uint32_t va) { (void)unused; set_noclamp_rgba(vr, vg, vb, va); }
+
+               void set(uint32_t vr, uint32_t vg, uint32_t vb, uint32_t va) { c[0] = static_cast<uint8_t>(vr); c[1] = static_cast<uint8_t>(vg); c[2] = static_cast<uint8_t>(vb); c[3] = static_cast<uint8_t>(va); }
+
+               void set_noclamp_rgb(uint32_t vr, uint32_t vg, uint32_t vb) { c[0] = static_cast<uint8_t>(vr); c[1] = static_cast<uint8_t>(vg); c[2] = static_cast<uint8_t>(vb); }
+               void set_noclamp_rgba(uint32_t vr, uint32_t vg, uint32_t vb, uint32_t va) { set(vr, vg, vb, va); }
+
+               void set_clamped(int vr, int vg, int vb, int va) { c[0] = clamp255(vr); c[1] = clamp255(vg);    c[2] = clamp255(vb); c[3] = clamp255(va); }
+
+               uint8_t operator[] (uint32_t idx) const { assert(idx < 4); return c[idx]; }
+               uint8_t &operator[] (uint32_t idx) { assert(idx < 4); return c[idx]; }
+
+               bool operator== (const color32&rhs) const { return m == rhs.m; }
+
+               void set_rgb(const color32& other) { c[0] = static_cast<uint8_t>(other.c[0]); c[1] = static_cast<uint8_t>(other.c[1]); c[2] = static_cast<uint8_t>(other.c[2]); }
+
+               static color32 comp_min(const color32& a, const color32& b) { return color32(eNoClamp::cNoClamp, std::min(a[0], b[0]), std::min(a[1], b[1]), std::min(a[2], b[2]), std::min(a[3], b[3])); }
+               static color32 comp_max(const color32& a, const color32& b) { return color32(eNoClamp::cNoClamp, std::max(a[0], b[0]), std::max(a[1], b[1]), std::max(a[2], b[2]), std::max(a[3], b[3])); }
+       };
+       
+       enum dxt_constants
+       {
+               cDXT1SelectorBits = 2U, cDXT1SelectorValues = 1U << cDXT1SelectorBits, cDXT1SelectorMask = cDXT1SelectorValues - 1U,
+               cDXT5SelectorBits = 3U, cDXT5SelectorValues = 1U << cDXT5SelectorBits, cDXT5SelectorMask = cDXT5SelectorValues - 1U,
+       };
+
+       struct bc1_block
+       {
+               enum { cTotalEndpointBytes = 2, cTotalSelectorBytes = 4 };
+
+               uint8_t m_low_color[cTotalEndpointBytes];
+               uint8_t m_high_color[cTotalEndpointBytes];
+               uint8_t m_selectors[cTotalSelectorBytes];
+               
+               inline uint32_t get_low_color() const { return m_low_color[0] | (m_low_color[1] << 8U); }
+               inline uint32_t get_high_color() const { return m_high_color[0] | (m_high_color[1] << 8U); }
+               inline bool is_3color() const { return get_low_color() <= get_high_color(); }
+               inline void set_low_color(uint16_t c) { m_low_color[0] = static_cast<uint8_t>(c & 0xFF); m_low_color[1] = static_cast<uint8_t>((c >> 8) & 0xFF); }
+               inline void set_high_color(uint16_t c) { m_high_color[0] = static_cast<uint8_t>(c & 0xFF); m_high_color[1] = static_cast<uint8_t>((c >> 8) & 0xFF); }
+               inline uint32_t get_selector(uint32_t x, uint32_t y) const { assert((x < 4U) && (y < 4U)); return (m_selectors[y] >> (x * cDXT1SelectorBits)) & cDXT1SelectorMask; }
+               inline void set_selector(uint32_t x, uint32_t y, uint32_t val) { assert((x < 4U) && (y < 4U) && (val < 4U)); m_selectors[y] &= (~(cDXT1SelectorMask << (x * cDXT1SelectorBits))); m_selectors[y] |= (val << (x * cDXT1SelectorBits)); }
+
+               static inline uint16_t pack_color(const color32& color, bool scaled, uint32_t bias = 127U)
+               {
+                       uint32_t r = color.r, g = color.g, b = color.b;
+                       if (scaled)
+                       {
+                               r = (r * 31U + bias) / 255U;
+                               g = (g * 63U + bias) / 255U;
+                               b = (b * 31U + bias) / 255U;
+                       }
+                       return static_cast<uint16_t>(minimum(b, 31U) | (minimum(g, 63U) << 5U) | (minimum(r, 31U) << 11U));
+               }
+
+               static inline uint16_t pack_unscaled_color(uint32_t r, uint32_t g, uint32_t b) { return static_cast<uint16_t>(b | (g << 5U) | (r << 11U)); }
+
+               static inline void unpack_color(uint32_t c, uint32_t& r, uint32_t& g, uint32_t& b)
+               {
+                       r = (c >> 11) & 31;
+                       g = (c >> 5) & 63;
+                       b = c & 31;
+
+                       r = (r << 3) | (r >> 2);
+                       g = (g << 2) | (g >> 4);
+                       b = (b << 3) | (b >> 2);
+               }
+
+               static inline void unpack_color_unscaled(uint32_t c, uint32_t& r, uint32_t& g, uint32_t& b)
+               {
+                       r = (c >> 11) & 31;
+                       g = (c >> 5) & 63;
+                       b = c & 31;
+               }
+       };
+
+       static const uint32_t TOTAL_ORDER_4_0_16 = 15;
+       static const uint32_t TOTAL_ORDER_4_1_16 = 700;
+       static const uint32_t TOTAL_ORDER_4_2_16 = 753;
+       static const uint32_t TOTAL_ORDER_4_3_16 = 515;
+       static uint16_t g_total_ordering4_hash[4096];
+       static float g_selector_factors4[NUM_UNIQUE_TOTAL_ORDERINGS4][3];
+
+       static const uint32_t TOTAL_ORDER_3_0_16 = 12;
+       static const uint32_t TOTAL_ORDER_3_1_16 = 15;
+       static const uint32_t TOTAL_ORDER_3_2_16 = 89;
+       static uint16_t g_total_ordering3_hash[256];
+       static float g_selector_factors3[NUM_UNIQUE_TOTAL_ORDERINGS3][3];
+               
+       struct hist4
+       {
+               uint8_t m_hist[4];
+
+               hist4() 
+               { 
+                       memset(m_hist, 0, sizeof(m_hist)); 
+               }
+
+               hist4(uint32_t i, uint32_t j, uint32_t k, uint32_t l)
+               {
+                       m_hist[0] = (uint8_t)i;
+                       m_hist[1] = (uint8_t)j;
+                       m_hist[2] = (uint8_t)k;
+                       m_hist[3] = (uint8_t)l;
+               }
+
+               inline bool operator== (const hist4 &h) const
+               {
+                       if (m_hist[0] != h.m_hist[0]) return false;
+                       if (m_hist[1] != h.m_hist[1]) return false;
+                       if (m_hist[2] != h.m_hist[2]) return false;
+                       if (m_hist[3] != h.m_hist[3]) return false;
+                       return true;
+               }
+
+               inline bool any_16() const 
+               {
+                       return (m_hist[0] == 16) || (m_hist[1] == 16) || (m_hist[2] == 16) || (m_hist[3] == 16);
+               }
+                               
+               inline uint32_t lookup_total_ordering_index() const
+               {
+                       if (m_hist[0] == 16)
+                               return TOTAL_ORDER_4_0_16;
+                       else if (m_hist[1] == 16)
+                               return TOTAL_ORDER_4_1_16;
+                       else if (m_hist[2] == 16)
+                               return TOTAL_ORDER_4_2_16;
+                       else if (m_hist[3] == 16)
+                               return TOTAL_ORDER_4_3_16;
+
+                       // Must sum to 16, so m_hist[3] isn't needed.
+                       return g_total_ordering4_hash[m_hist[0] | (m_hist[1] << 4) | (m_hist[2] << 8)];
+               }
+       };
+
+       struct hist3
+       {
+               uint8_t m_hist[3];
+
+               hist3() 
+               { 
+                       memset(m_hist, 0, sizeof(m_hist)); 
+               }
+
+               hist3(uint32_t i, uint32_t j, uint32_t k)
+               {
+                       m_hist[0] = (uint8_t)i;
+                       m_hist[1] = (uint8_t)j;
+                       m_hist[2] = (uint8_t)k;
+               }
+
+               inline bool operator== (const hist3 &h) const
+               {
+                       if (m_hist[0] != h.m_hist[0]) return false;
+                       if (m_hist[1] != h.m_hist[1]) return false;
+                       if (m_hist[2] != h.m_hist[2]) return false;
+                       return true;
+               }
+
+               inline bool any_16() const 
+               {
+                       return (m_hist[0] == 16) || (m_hist[1] == 16) || (m_hist[2] == 16);
+               }
+                               
+               inline uint32_t lookup_total_ordering_index() const
+               {
+                       if (m_hist[0] == 16)
+                               return TOTAL_ORDER_3_0_16;
+                       else if (m_hist[1] == 16)
+                               return TOTAL_ORDER_3_1_16;
+                       else if (m_hist[2] == 16)
+                               return TOTAL_ORDER_3_2_16;
+
+                       // Must sum to 16, so m_hist[2] isn't needed.
+                       return g_total_ordering3_hash[m_hist[0] | (m_hist[1] << 4)];
+               }
+       };
+
+       struct bc1_match_entry
+       {
+               uint8_t m_hi;
+               uint8_t m_lo;
+               uint8_t m_e;
+       };
+
+       static bc1_approx_mode g_bc1_approx_mode;
+       static bc1_match_entry g_bc1_match5_equals_1[256], g_bc1_match6_equals_1[256];
+       static bc1_match_entry g_bc1_match5_half[256], g_bc1_match6_half[256]; 
+
+       static inline int scale_5_to_8(int v) { return (v << 3) | (v >> 2); }
+       static inline int scale_6_to_8(int v) { return (v << 2) | (v >> 4); }
+
+       // v0, v1 = unexpanded DXT1 endpoint values (5/6-bits)
+       // c0, c1 = expanded DXT1 endpoint values (8-bits)
+       static inline int interp_5_6_ideal(int c0, int c1) { assert(c0 < 256 && c1 < 256); return (c0 * 2 + c1) / 3; }
+       static inline int interp_5_6_ideal_round(int c0, int c1) { assert(c0 < 256 && c1 < 256); return (c0 * 2 + c1 + 1) / 3; }
+       static inline int interp_half_5_6_ideal(int c0, int c1) { assert(c0 < 256 && c1 < 256); return (c0 + c1) / 2; }
+
+       static inline int interp_5_nv(int v0, int v1) { assert(v0 < 32 && v1 < 32); return ((2 * v0 + v1) * 22) / 8; }
+       static inline int interp_6_nv(int c0, int c1) { assert(c0 < 256 && c1 < 256); const int gdiff = c1 - c0; return (256 * c0 + (gdiff / 4) + 128 + gdiff * 80) / 256; }
+
+       static inline int interp_half_5_nv(int v0, int v1) { assert(v0 < 32 && v1 < 32); return ((v0 + v1) * 33) / 8; }
+       static inline int interp_half_6_nv(int c0, int c1) { assert(c0 < 256 && c1 < 256); const int gdiff = c1 - c0; return (256 * c0 + gdiff/4 + 128 + gdiff * 128) / 256; }
+
+       static inline int interp_5_6_amd(int c0, int c1) { assert(c0 < 256 && c1 < 256); return (c0 * 43 + c1 * 21 + 32) >> 6; }
+       static inline int interp_half_5_6_amd(int c0, int c1) { assert(c0 < 256 && c1 < 256); return (c0 + c1 + 1) >> 1; }
+
+       static inline int interp_5(int v0, int v1, int c0, int c1, bc1_approx_mode mode) 
+       { 
+               assert(scale_5_to_8(v0) == c0 && scale_5_to_8(v1) == c1);
+               switch (mode)
+               {
+               case bc1_approx_mode::cBC1NVidia: return interp_5_nv(v0, v1); 
+               case bc1_approx_mode::cBC1AMD: return interp_5_6_amd(c0, c1);
+               default:
+               case bc1_approx_mode::cBC1Ideal: return interp_5_6_ideal(c0, c1);               
+               case bc1_approx_mode::cBC1IdealRound4: return interp_5_6_ideal_round(c0, c1);           
+               }
+       }
+
+       static inline int interp_6(int v0, int v1, int c0, int c1, bc1_approx_mode mode) 
+       { 
+               (void)v0; (void)v1;
+               assert(scale_6_to_8(v0) == c0 && scale_6_to_8(v1) == c1);
+               switch (mode)
+               {
+               case bc1_approx_mode::cBC1NVidia: return interp_6_nv(c0, c1); 
+               case bc1_approx_mode::cBC1AMD: return interp_5_6_amd(c0, c1);
+               default:
+               case bc1_approx_mode::cBC1Ideal: return interp_5_6_ideal(c0, c1);               
+               case bc1_approx_mode::cBC1IdealRound4: return interp_5_6_ideal_round(c0, c1);           
+               }
+       }
+
+       static inline int interp_half_5(int v0, int v1, int c0, int c1, bc1_approx_mode mode) 
+       { 
+               assert(scale_5_to_8(v0) == c0 && scale_5_to_8(v1) == c1);
+               switch (mode)
+               {
+               case bc1_approx_mode::cBC1NVidia: return interp_half_5_nv(v0, v1); 
+               case bc1_approx_mode::cBC1AMD: return interp_half_5_6_amd(c0, c1);
+               case bc1_approx_mode::cBC1Ideal: 
+               case bc1_approx_mode::cBC1IdealRound4: 
+               default:
+                       return interp_half_5_6_ideal(c0, c1);           
+               }
+       }
+
+       static inline int interp_half_6(int v0, int v1, int c0, int c1, bc1_approx_mode mode) 
+       { 
+               (void)v0; (void)v1;
+               assert(scale_6_to_8(v0) == c0 && scale_6_to_8(v1) == c1);
+               switch (mode)
+               {
+               case bc1_approx_mode::cBC1NVidia: return interp_half_6_nv(c0, c1); 
+               case bc1_approx_mode::cBC1AMD: return interp_half_5_6_amd(c0, c1);
+               case bc1_approx_mode::cBC1Ideal: 
+               case bc1_approx_mode::cBC1IdealRound4: 
+               default:
+                       return interp_half_5_6_ideal(c0, c1);           
+               }
+       }
+
+       static void prepare_bc1_single_color_table_half(bc1_match_entry* pTable, const uint8_t* pExpand, int size, bc1_approx_mode mode)
+       {
+               for (int i = 0; i < 256; i++)
+               {
+                       int lowest_e = 256;
+                       for (int lo = 0; lo < size; lo++)
+                       {
+                               const int lo_e = pExpand[lo];
+
+                               for (int hi = 0; hi < size; hi++)
+                               {
+                                       const int hi_e = pExpand[hi];
+                                                                               
+                                       const int v = (size == 32) ? interp_half_5(hi, lo, hi_e, lo_e, mode) : interp_half_6(hi, lo, hi_e, lo_e, mode);
+                                                                                       
+                                       int e = iabs(v - i);
+
+                                       // We only need to factor in 3% error in BC1 ideal mode.
+                                       if ((mode == bc1_approx_mode::cBC1Ideal) || (mode == bc1_approx_mode::cBC1IdealRound4))
+                                               e += (iabs(hi_e - lo_e) * 3) / 100;
+
+                                       // Favor equal endpoints, for lower error on actual GPU's which approximate the interpolation.
+                                       if ((e < lowest_e) || ((e == lowest_e) && (lo == hi)))
+                                       {
+                                               pTable[i].m_hi = static_cast<uint8_t>(hi);
+                                               pTable[i].m_lo = static_cast<uint8_t>(lo);
+                                               
+                                               assert(e <= UINT8_MAX);
+                                               pTable[i].m_e = static_cast<uint8_t>(e);
+
+                                               lowest_e = e;
+                                       }
+
+                               } // hi
+                       } // lo
+               }
+       }
+
+       static void prepare_bc1_single_color_table(bc1_match_entry* pTable, const uint8_t* pExpand, int size, bc1_approx_mode mode)
+       {
+               for (int i = 0; i < 256; i++)
+               {
+                       int lowest_e = 256;
+                       for (int lo = 0; lo < size; lo++)
+                       {
+                               const int lo_e = pExpand[lo];
+
+                               for (int hi = 0; hi < size; hi++)
+                               {
+                                       const int hi_e = pExpand[hi];
+
+                                       const int v = (size == 32) ? interp_5(hi, lo, hi_e, lo_e, mode) : interp_6(hi, lo, hi_e, lo_e, mode);
+                                       
+                                       int e = iabs(v - i);
+
+                                       if ((mode == bc1_approx_mode::cBC1Ideal) || (mode == bc1_approx_mode::cBC1IdealRound4))
+                                               e += (iabs(hi_e - lo_e) * 3) / 100;
+
+                                       // Favor equal endpoints, for lower error on actual GPU's which approximate the interpolation.
+                                       if ((e < lowest_e) || ((e == lowest_e) && (lo == hi)))
+                                       {
+                                               pTable[i].m_hi = static_cast<uint8_t>(hi);
+                                               pTable[i].m_lo = static_cast<uint8_t>(lo);
+                                               
+                                               assert(e <= UINT8_MAX);
+                                               pTable[i].m_e = static_cast<uint8_t>(e);
+
+                                               lowest_e = e;
+                                       }
+
+                               } // hi
+                       } // lo
+               }
+       }
+
+       // This table is: 9 * (w * w), 9 * ((1.0f - w) * w), 9 * ((1.0f - w) * (1.0f - w))
+       // where w is [0,1/3,2/3,1]. 9 is the perfect multiplier.
+       static const uint32_t g_weight_vals4[4] = { 0x000009, 0x010204, 0x040201, 0x090000 };
+       
+       // multiplier is 4 for 3-color
+       static const uint32_t g_weight_vals3[3] = { 0x000004, 0x040000, 0x010101 };
+
+       static inline void compute_selector_factors4(const hist4 &h, float &iz00, float &iz10, float &iz11)
+       {
+               uint32_t weight_accum = 0;
+               for (uint32_t sel = 0; sel < 4; sel++)
+                       weight_accum += g_weight_vals4[sel] * h.m_hist[sel];
+
+               float z00 = (float)((weight_accum >> 16) & 0xFF);
+               float z10 = (float)((weight_accum >> 8) & 0xFF);
+               float z11 = (float)(weight_accum & 0xFF);
+               float z01 = z10;
+
+               float det = z00 * z11 - z01 * z10;
+               if (fabs(det) < 1e-8f)
+                       det = 0.0f;
+               else
+                       det = (3.0f / 255.0f) / det;
+                               
+               iz00 = z11 * det;
+               iz10 = -z10 * det;
+               iz11 = z00 * det;
+       }
+
+       static inline void compute_selector_factors3(const hist3 &h, float &iz00, float &iz10, float &iz11)
+       {
+               uint32_t weight_accum = 0;
+               for (uint32_t sel = 0; sel < 3; sel++)
+                       weight_accum += g_weight_vals3[sel] * h.m_hist[sel];
+
+               float z00 = (float)((weight_accum >> 16) & 0xFF);
+               float z10 = (float)((weight_accum >> 8) & 0xFF);
+               float z11 = (float)(weight_accum & 0xFF);
+               float z01 = z10;
+
+               float det = z00 * z11 - z01 * z10;
+               if (fabs(det) < 1e-8f)
+                       det = 0.0f;
+               else
+                       det = (2.0f / 255.0f) / det;
+                               
+               iz00 = z11 * det;
+               iz10 = -z10 * det;
+               iz11 = z00 * det;
+       }
+
+       static bool g_initialized;
+               
+       void init(bc1_approx_mode mode)
+       {
+               g_bc1_approx_mode = mode;
+                                                               
+               uint8_t bc1_expand5[32];
+               for (int i = 0; i < 32; i++)
+                       bc1_expand5[i] = static_cast<uint8_t>((i << 3) | (i >> 2));
+               prepare_bc1_single_color_table(g_bc1_match5_equals_1, bc1_expand5, 32, mode);
+               prepare_bc1_single_color_table_half(g_bc1_match5_half, bc1_expand5, 32, mode);
+
+               uint8_t bc1_expand6[64];
+               for (int i = 0; i < 64; i++)
+                       bc1_expand6[i] = static_cast<uint8_t>((i << 2) | (i >> 4));
+               prepare_bc1_single_color_table(g_bc1_match6_equals_1, bc1_expand6, 64, mode);
+               prepare_bc1_single_color_table_half(g_bc1_match6_half, bc1_expand6, 64, mode);
+
+               for (uint32_t i = 0; i < NUM_UNIQUE_TOTAL_ORDERINGS4; i++)
+               {
+                       hist4 h;
+                       h.m_hist[0] = (uint8_t)g_unique_total_orders4[i][0];
+                       h.m_hist[1] = (uint8_t)g_unique_total_orders4[i][1];
+                       h.m_hist[2] = (uint8_t)g_unique_total_orders4[i][2];
+                       h.m_hist[3] = (uint8_t)g_unique_total_orders4[i][3];
+                       
+                       if (!h.any_16())
+                       {
+                               const uint32_t index = h.m_hist[0] | (h.m_hist[1] << 4) | (h.m_hist[2] << 8);
+                               assert(index < 4096);
+                               g_total_ordering4_hash[index] = (uint16_t)i;
+                       }
+
+                       compute_selector_factors4(h, g_selector_factors4[i][0], g_selector_factors4[i][1], g_selector_factors4[i][2]);
+               }
+
+               for (uint32_t i = 0; i < NUM_UNIQUE_TOTAL_ORDERINGS3; i++)
+               {
+                       hist3 h;
+                       h.m_hist[0] = (uint8_t)g_unique_total_orders3[i][0];
+                       h.m_hist[1] = (uint8_t)g_unique_total_orders3[i][1];
+                       h.m_hist[2] = (uint8_t)g_unique_total_orders3[i][2];
+                       
+                       if (!h.any_16())
+                       {
+                               const uint32_t index = h.m_hist[0] | (h.m_hist[1] << 4);
+                               assert(index < 256);
+                               g_total_ordering3_hash[index] = (uint16_t)i;
+                       }
+
+                       compute_selector_factors3(h, g_selector_factors3[i][0], g_selector_factors3[i][1], g_selector_factors3[i][2]);
+               }
+
+               g_initialized = true;
+       }
+       
+       void encode_bc1_solid_block(void* pDst, uint32_t fr, uint32_t fg, uint32_t fb, bool allow_3color) 
+       {
+               bc1_block* pDst_block = static_cast<bc1_block*>(pDst);
+
+               uint32_t mask = 0xAA;
+               int max16 = -1, min16 = 0;
+
+               if (allow_3color)
+               {
+                       const uint32_t err4 = g_bc1_match5_equals_1[fr].m_e + g_bc1_match6_equals_1[fg].m_e + g_bc1_match5_equals_1[fb].m_e;
+                       const uint32_t err3 = g_bc1_match5_half[fr].m_e + g_bc1_match6_half[fg].m_e + g_bc1_match5_half[fb].m_e;
+
+                       if (err3 < err4)
+                       {
+                               max16 = (g_bc1_match5_half[fr].m_hi << 11) | (g_bc1_match6_half[fg].m_hi << 5) | g_bc1_match5_half[fb].m_hi;
+                               min16 = (g_bc1_match5_half[fr].m_lo << 11) | (g_bc1_match6_half[fg].m_lo << 5) | g_bc1_match5_half[fb].m_lo;
+
+                               if (max16 > min16)
+                                       std::swap(max16, min16);
+                       }
+               }
+
+               if (max16 == -1)
+               {
+                       max16 = (g_bc1_match5_equals_1[fr].m_hi << 11) | (g_bc1_match6_equals_1[fg].m_hi << 5) | g_bc1_match5_equals_1[fb].m_hi;
+                       min16 = (g_bc1_match5_equals_1[fr].m_lo << 11) | (g_bc1_match6_equals_1[fg].m_lo << 5) | g_bc1_match5_equals_1[fb].m_lo;
+
+                       if (min16 == max16)
+                       {
+                               // Always forbid 3 color blocks
+                               // This is to guarantee that BC3 blocks never use punchthrough alpha (3 color) mode, which isn't supported on some (all?) GPU's.
+                               mask = 0;
+
+                               // Make l > h
+                               if (min16 > 0)
+                                       min16--;
+                               else
+                               {
+                                       // l = h = 0
+                                       assert(min16 == max16 && max16 == 0);
+
+                                       max16 = 1;
+                                       min16 = 0;
+                                       mask = 0x55;
+                               }
+
+                               assert(max16 > min16);
+                       }
+
+                       if (max16 < min16)
+                       {
+                               std::swap(max16, min16);
+                               mask ^= 0x55;
+                       }
+               }
+
+               pDst_block->set_low_color(static_cast<uint16_t>(max16));
+               pDst_block->set_high_color(static_cast<uint16_t>(min16));
+               pDst_block->m_selectors[0] = static_cast<uint8_t>(mask);
+               pDst_block->m_selectors[1] = static_cast<uint8_t>(mask);
+               pDst_block->m_selectors[2] = static_cast<uint8_t>(mask);
+               pDst_block->m_selectors[3] = static_cast<uint8_t>(mask);
+       }
+
+       static const float g_midpoint5[32] = { .015686f, .047059f, .078431f, .111765f, .145098f, .176471f, .207843f, .241176f, .274510f, .305882f, .337255f, .370588f, .403922f, .435294f, .466667f, .5f, .533333f, .564706f, .596078f, .629412f, .662745f, .694118f, .725490f, .758824f, .792157f, .823529f, .854902f, .888235f, .921569f, .952941f, .984314f, 1e+37f };
+       static const float g_midpoint6[64] = { .007843f, .023529f, .039216f, .054902f, .070588f, .086275f, .101961f, .117647f, .133333f, .149020f, .164706f, .180392f, .196078f, .211765f, .227451f, .245098f, .262745f, .278431f, .294118f, .309804f, .325490f, .341176f, .356863f, .372549f, .388235f, .403922f, .419608f, .435294f, .450980f, .466667f, .482353f, .500000f, .517647f, .533333f, .549020f, .564706f, .580392f, .596078f, .611765f, .627451f, .643137f, .658824f, .674510f, .690196f, .705882f, .721569f, .737255f, .754902f, .772549f, .788235f, .803922f, .819608f, .835294f, .850980f, .866667f, .882353f, .898039f, .913725f, .929412f, .945098f, .960784f, .976471f, .992157f, 1e+37f };
+
+       struct vec3F { float c[3]; };
+
+       static inline void compute_least_squares_endpoints4_rgb(
+               vec3F* pXl, vec3F* pXh,
+               int total_r, int total_g, int total_b,
+               float iz00, float iz10, float iz11,
+               uint32_t s, const uint32_t r_sum[17], const uint32_t g_sum[17], const uint32_t b_sum[17])
+       {
+               const float iz01 = iz10;
+
+               const uint32_t f1 = g_unique_total_orders4[s][0];
+               const uint32_t f2 = g_unique_total_orders4[s][0] + g_unique_total_orders4[s][1];
+               const uint32_t f3 = g_unique_total_orders4[s][0] + g_unique_total_orders4[s][1] + g_unique_total_orders4[s][2];
+               uint32_t uq00_r = (r_sum[f2] - r_sum[f1]) + (r_sum[f3] - r_sum[f2]) * 2 + (r_sum[16] - r_sum[f3]) * 3;
+               uint32_t uq00_g = (g_sum[f2] - g_sum[f1]) + (g_sum[f3] - g_sum[f2]) * 2 + (g_sum[16] - g_sum[f3]) * 3;
+               uint32_t uq00_b = (b_sum[f2] - b_sum[f1]) + (b_sum[f3] - b_sum[f2]) * 2 + (b_sum[16] - b_sum[f3]) * 3;
+
+               float q10_r = (float)(total_r * 3 - uq00_r);
+               float q10_g = (float)(total_g * 3 - uq00_g);
+               float q10_b = (float)(total_b * 3 - uq00_b);
+
+               pXl->c[0] = iz00 * (float)uq00_r + iz01 * q10_r;
+               pXh->c[0] = iz10 * (float)uq00_r + iz11 * q10_r;
+
+               pXl->c[1] = iz00 * (float)uq00_g + iz01 * q10_g;
+               pXh->c[1] = iz10 * (float)uq00_g + iz11 * q10_g;
+
+               pXl->c[2] = iz00 * (float)uq00_b + iz01 * q10_b;
+               pXh->c[2] = iz10 * (float)uq00_b + iz11 * q10_b;
+       }
+               
+       static inline bool compute_least_squares_endpoints4_rgb(const color32* pColors, const uint8_t* pSelectors, vec3F* pXl, vec3F* pXh, int total_r, int total_g, int total_b)
+       {
+               uint32_t uq00_r = 0, uq00_g = 0, uq00_b = 0;
+               uint32_t weight_accum = 0;
+               for (uint32_t i = 0; i < 16; i++)
+               {
+                       const uint8_t r = pColors[i].c[0], g = pColors[i].c[1], b = pColors[i].c[2];
+                       const uint8_t sel = pSelectors[i];
+                       
+                       weight_accum += g_weight_vals4[sel];
+                       uq00_r += sel * r;
+                       uq00_g += sel * g;
+                       uq00_b += sel * b;
+               }
+
+               int q10_r = total_r * 3 - uq00_r;
+               int q10_g = total_g * 3 - uq00_g;
+               int q10_b = total_b * 3 - uq00_b;
+
+               float z00 = (float)((weight_accum >> 16) & 0xFF);
+               float z10 = (float)((weight_accum >> 8) & 0xFF);
+               float z11 = (float)(weight_accum & 0xFF);
+               float z01 = z10;
+
+               float det = z00 * z11 - z01 * z10;
+               if (fabs(det) < 1e-8f)
+                       return false;
+
+               det = (3.0f / 255.0f) / det;
+
+               float iz00, iz01, iz10, iz11;
+               iz00 = z11 * det;
+               iz01 = -z01 * det;
+               iz10 = -z10 * det;
+               iz11 = z00 * det;
+
+               pXl->c[0] = iz00 * (float)uq00_r + iz01 * q10_r;
+               pXh->c[0] = iz10 * (float)uq00_r + iz11 * q10_r;
+
+               pXl->c[1] = iz00 * (float)uq00_g + iz01 * q10_g;
+               pXh->c[1] = iz10 * (float)uq00_g + iz11 * q10_g;
+
+               pXl->c[2] = iz00 * (float)uq00_b + iz01 * q10_b;
+               pXh->c[2] = iz10 * (float)uq00_b + iz11 * q10_b;
+
+               return true;
+       }
+
+       static inline void compute_least_squares_endpoints3_rgb(
+               vec3F* pXl, vec3F* pXh,
+               int total_r, int total_g, int total_b,
+               float iz00, float iz10, float iz11,
+               uint32_t s, const uint32_t r_sum[17], const uint32_t g_sum[17], const uint32_t b_sum[17])
+       {
+               const float iz01 = iz10;
+
+               // Compensates for BC1 3-color ordering, which is selector 0, 2, 1
+               const uint32_t f1 = g_unique_total_orders3[s][0];
+               const uint32_t f2 = g_unique_total_orders3[s][0] + g_unique_total_orders3[s][2];
+               uint32_t uq00_r = (r_sum[16] - r_sum[f2]) * 2 + (r_sum[f2] - r_sum[f1]);
+               uint32_t uq00_g = (g_sum[16] - g_sum[f2]) * 2 + (g_sum[f2] - g_sum[f1]);
+               uint32_t uq00_b = (b_sum[16] - b_sum[f2]) * 2 + (b_sum[f2] - b_sum[f1]);
+
+               float q10_r = (float)(total_r * 2 - uq00_r);
+               float q10_g = (float)(total_g * 2 - uq00_g);
+               float q10_b = (float)(total_b * 2 - uq00_b);
+
+               pXl->c[0] = iz00 * (float)uq00_r + iz01 * q10_r;
+               pXh->c[0] = iz10 * (float)uq00_r + iz11 * q10_r;
+
+               pXl->c[1] = iz00 * (float)uq00_g + iz01 * q10_g;
+               pXh->c[1] = iz10 * (float)uq00_g + iz11 * q10_g;
+
+               pXl->c[2] = iz00 * (float)uq00_b + iz01 * q10_b;
+               pXh->c[2] = iz10 * (float)uq00_b + iz11 * q10_b;
+       }
+
+       static inline bool compute_least_squares_endpoints3_rgb(bool use_black, const color32* pColors, const uint8_t* pSelectors, vec3F* pXl, vec3F* pXh)
+       {
+               int uq00_r = 0, uq00_g = 0, uq00_b = 0;
+               uint32_t weight_accum = 0;
+               int total_r = 0, total_g = 0, total_b = 0;
+               for (uint32_t i = 0; i < 16; i++)
+               {
+                       const uint8_t r = pColors[i].c[0], g = pColors[i].c[1], b = pColors[i].c[2];
+                       if (use_black)
+                       {
+                               if ((r | g | b) < 4)
+                                       continue;
+                       }
+
+                       const uint8_t sel = pSelectors[i];
+                       assert(sel <= 3);
+                       if (sel == 3)
+                               continue;
+                                               
+                       weight_accum += g_weight_vals3[sel];
+
+                       static const uint8_t s_tran[3] = { 0, 2, 1 };
+                       const uint8_t tsel = s_tran[sel];
+                       uq00_r += tsel * r;
+                       uq00_g += tsel * g;
+                       uq00_b += tsel * b;
+
+                       total_r += r;
+                       total_g += g;
+                       total_b += b;
+               }
+
+               int q10_r = total_r * 2 - uq00_r;
+               int q10_g = total_g * 2 - uq00_g;
+               int q10_b = total_b * 2 - uq00_b;
+
+               float z00 = (float)((weight_accum >> 16) & 0xFF);
+               float z10 = (float)((weight_accum >> 8) & 0xFF);
+               float z11 = (float)(weight_accum & 0xFF);
+               float z01 = z10;
+
+               float det = z00 * z11 - z01 * z10;
+               if (fabs(det) < 1e-8f)
+                       return false;
+
+               det = (2.0f / 255.0f) / det;
+
+               float iz00, iz01, iz10, iz11;
+               iz00 = z11 * det;
+               iz01 = -z01 * det;
+               iz10 = -z10 * det;
+               iz11 = z00 * det;
+
+               pXl->c[0] = iz00 * (float)uq00_r + iz01 * q10_r;
+               pXh->c[0] = iz10 * (float)uq00_r + iz11 * q10_r;
+
+               pXl->c[1] = iz00 * (float)uq00_g + iz01 * q10_g;
+               pXh->c[1] = iz10 * (float)uq00_g + iz11 * q10_g;
+
+               pXl->c[2] = iz00 * (float)uq00_b + iz01 * q10_b;
+               pXh->c[2] = iz10 * (float)uq00_b + iz11 * q10_b;
+
+               return true;
+       }
+
+       static inline void bc1_get_block_colors4(uint32_t block_r[4], uint32_t block_g[4], uint32_t block_b[4], uint32_t lr, uint32_t lg, uint32_t lb, uint32_t hr, uint32_t hg, uint32_t hb)
+       {
+               block_r[0] = (lr << 3) | (lr >> 2); block_g[0] = (lg << 2) | (lg >> 4); block_b[0] = (lb << 3) | (lb >> 2);
+               block_r[3] = (hr << 3) | (hr >> 2);     block_g[3] = (hg << 2) | (hg >> 4);     block_b[3] = (hb << 3) | (hb >> 2);
+
+               if (g_bc1_approx_mode == bc1_approx_mode::cBC1Ideal)
+               {
+                       block_r[1] = (block_r[0] * 2 + block_r[3]) / 3; block_g[1] = (block_g[0] * 2 + block_g[3]) / 3; block_b[1] = (block_b[0] * 2 + block_b[3]) / 3;
+                       block_r[2] = (block_r[3] * 2 + block_r[0]) / 3; block_g[2] = (block_g[3] * 2 + block_g[0]) / 3; block_b[2] = (block_b[3] * 2 + block_b[0]) / 3;
+               }
+               else if (g_bc1_approx_mode == bc1_approx_mode::cBC1IdealRound4)
+               {
+                       block_r[1] = (block_r[0] * 2 + block_r[3] + 1) / 3;     block_g[1] = (block_g[0] * 2 + block_g[3] + 1) / 3;     block_b[1] = (block_b[0] * 2 + block_b[3] + 1) / 3;
+                       block_r[2] = (block_r[3] * 2 + block_r[0] + 1) / 3;     block_g[2] = (block_g[3] * 2 + block_g[0] + 1) / 3;     block_b[2] = (block_b[3] * 2 + block_b[0] + 1) / 3;
+               }
+               else if (g_bc1_approx_mode == bc1_approx_mode::cBC1AMD)
+               {
+                       block_r[1] = interp_5_6_amd(block_r[0], block_r[3]); block_g[1] = interp_5_6_amd(block_g[0], block_g[3]); block_b[1] = interp_5_6_amd(block_b[0], block_b[3]);
+                       block_r[2] = interp_5_6_amd(block_r[3], block_r[0]); block_g[2] = interp_5_6_amd(block_g[3], block_g[0]); block_b[2] = interp_5_6_amd(block_b[3], block_b[0]);
+               }
+               else
+               {
+                       block_r[1] = interp_5_nv(lr, hr); block_g[1] = interp_6_nv(block_g[0], block_g[3]); block_b[1] = interp_5_nv(lb, hb);
+                       block_r[2] = interp_5_nv(hr, lr); block_g[2] = interp_6_nv(block_g[3], block_g[0]); block_b[2] = interp_5_nv(hb, lb);
+               }
+       }
+
+       static inline void bc1_get_block_colors3(uint32_t block_r[3], uint32_t block_g[3], uint32_t block_b[3], uint32_t lr, uint32_t lg, uint32_t lb, uint32_t hr, uint32_t hg, uint32_t hb)
+       {
+               block_r[0] = (lr << 3) | (lr >> 2); block_g[0] = (lg << 2) | (lg >> 4); block_b[0] = (lb << 3) | (lb >> 2);
+               block_r[1] = (hr << 3) | (hr >> 2);     block_g[1] = (hg << 2) | (hg >> 4);     block_b[1] = (hb << 3) | (hb >> 2);
+
+               if ((g_bc1_approx_mode == bc1_approx_mode::cBC1Ideal) || (g_bc1_approx_mode == bc1_approx_mode::cBC1IdealRound4))
+               {
+                       block_r[2] = (block_r[0] + block_r[1]) / 2; block_g[2] = (block_g[0] + block_g[1]) / 2; block_b[2] = (block_b[0] + block_b[1]) / 2;
+               }
+               else if (g_bc1_approx_mode == bc1_approx_mode::cBC1AMD)
+               {
+                       block_r[2] = interp_half_5_6_amd(block_r[0], block_r[1]); block_g[2] = interp_half_5_6_amd(block_g[0], block_g[1]); block_b[2] = interp_half_5_6_amd(block_b[0], block_b[1]);
+               }
+               else
+               {
+                       block_r[2] = interp_half_5_nv(lr, hr); block_g[2] = interp_half_6_nv(block_g[0], block_g[1]); block_b[2] = interp_half_5_nv(lb, hb);
+               }
+       }
+
+       static inline void bc1_find_sels4_noerr(const color32* pSrc_pixels, uint32_t lr, uint32_t lg, uint32_t lb, uint32_t hr, uint32_t hg, uint32_t hb, uint8_t sels[16])
+       {
+               uint32_t block_r[4], block_g[4], block_b[4];
+               bc1_get_block_colors4(block_r, block_g, block_b, lr, lg, lb, hr, hg, hb);
+
+               int ar = block_r[3] - block_r[0], ag = block_g[3] - block_g[0], ab = block_b[3] - block_b[0];
+
+               int dots[4];
+               for (uint32_t i = 0; i < 4; i++)
+                       dots[i] = (int)block_r[i] * ar + (int)block_g[i] * ag + (int)block_b[i] * ab;
+
+               int t0 = dots[0] + dots[1], t1 = dots[1] + dots[2], t2 = dots[2] + dots[3];
+
+               ar *= 2; ag *= 2; ab *= 2;
+
+               static const uint8_t s_sels[4] = { 3, 2, 1, 0 };
+
+               for (uint32_t i = 0; i < 16; i += 4)
+               {
+                       const int d0 = pSrc_pixels[i+0].r * ar + pSrc_pixels[i+0].g * ag + pSrc_pixels[i+0].b * ab;
+                       const int d1 = pSrc_pixels[i+1].r * ar + pSrc_pixels[i+1].g * ag + pSrc_pixels[i+1].b * ab;
+                       const int d2 = pSrc_pixels[i+2].r * ar + pSrc_pixels[i+2].g * ag + pSrc_pixels[i+2].b * ab;
+                       const int d3 = pSrc_pixels[i+3].r * ar + pSrc_pixels[i+3].g * ag + pSrc_pixels[i+3].b * ab;
+
+                       sels[i+0] = s_sels[(d0 <= t0) + (d0 < t1) + (d0 < t2)];
+                       sels[i+1] = s_sels[(d1 <= t0) + (d1 < t1) + (d1 < t2)];
+                       sels[i+2] = s_sels[(d2 <= t0) + (d2 < t1) + (d2 < t2)];
+                       sels[i+3] = s_sels[(d3 <= t0) + (d3 < t1) + (d3 < t2)];
+               }
+       }
+
+       static inline uint32_t bc1_find_sels4_fasterr(const color32* pSrc_pixels, uint32_t lr, uint32_t lg, uint32_t lb, uint32_t hr, uint32_t hg, uint32_t hb, uint8_t sels[16], uint32_t cur_err)
+       {
+               uint32_t block_r[4], block_g[4], block_b[4];
+               bc1_get_block_colors4(block_r, block_g, block_b, lr, lg, lb, hr, hg, hb);
+                               
+               int ar = block_r[3] - block_r[0], ag = block_g[3] - block_g[0], ab = block_b[3] - block_b[0];
+
+               int dots[4];
+               for (uint32_t i = 0; i < 4; i++)
+                       dots[i] = (int)block_r[i] * ar + (int)block_g[i] * ag + (int)block_b[i] * ab;
+
+               int t0 = dots[0] + dots[1], t1 = dots[1] + dots[2], t2 = dots[2] + dots[3];
+
+               ar *= 2; ag *= 2; ab *= 2;
+
+               static const uint8_t s_sels[4] = { 3, 2, 1, 0 };
+
+               uint32_t total_err = 0;
+
+               for (uint32_t i = 0; i < 16; i += 4)
+               {
+                       const int d0 = pSrc_pixels[i+0].r * ar + pSrc_pixels[i+0].g * ag + pSrc_pixels[i+0].b * ab;
+                       const int d1 = pSrc_pixels[i+1].r * ar + pSrc_pixels[i+1].g * ag + pSrc_pixels[i+1].b * ab;
+                       const int d2 = pSrc_pixels[i+2].r * ar + pSrc_pixels[i+2].g * ag + pSrc_pixels[i+2].b * ab;
+                       const int d3 = pSrc_pixels[i+3].r * ar + pSrc_pixels[i+3].g * ag + pSrc_pixels[i+3].b * ab;
+
+                       uint8_t sel0 = s_sels[(d0 <= t0) + (d0 < t1) + (d0 < t2)];
+                       uint8_t sel1 = s_sels[(d1 <= t0) + (d1 < t1) + (d1 < t2)];
+                       uint8_t sel2 = s_sels[(d2 <= t0) + (d2 < t1) + (d2 < t2)];
+                       uint8_t sel3 = s_sels[(d3 <= t0) + (d3 < t1) + (d3 < t2)];
+
+                       sels[i+0] = sel0;
+                       sels[i+1] = sel1;
+                       sels[i+2] = sel2;
+                       sels[i+3] = sel3;
+
+                       total_err += squarei(pSrc_pixels[i+0].r - block_r[sel0]) + squarei(pSrc_pixels[i+0].g - block_g[sel0]) + squarei(pSrc_pixels[i+0].b - block_b[sel0]);
+                       total_err += squarei(pSrc_pixels[i+1].r - block_r[sel1]) + squarei(pSrc_pixels[i+1].g - block_g[sel1]) + squarei(pSrc_pixels[i+1].b - block_b[sel1]);
+                       total_err += squarei(pSrc_pixels[i+2].r - block_r[sel2]) + squarei(pSrc_pixels[i+2].g - block_g[sel2]) + squarei(pSrc_pixels[i+2].b - block_b[sel2]);
+                       total_err += squarei(pSrc_pixels[i+3].r - block_r[sel3]) + squarei(pSrc_pixels[i+3].g - block_g[sel3]) + squarei(pSrc_pixels[i+3].b - block_b[sel3]);
+
+                       if (total_err >= cur_err)
+                               break;
+               }
+
+               return total_err;
+       }
+       
+       static inline uint32_t bc1_find_sels4_check2_err(const color32* pSrc_pixels, uint32_t lr, uint32_t lg, uint32_t lb, uint32_t hr, uint32_t hg, uint32_t hb, uint8_t sels[16], uint32_t cur_err)
+       {
+               uint32_t block_r[4], block_g[4], block_b[4];
+               bc1_get_block_colors4(block_r, block_g, block_b, lr, lg, lb, hr, hg, hb);
+                               
+               int dr = block_r[3] - block_r[0], dg = block_g[3] - block_g[0], db = block_b[3] - block_b[0];
+
+               const float f = 4.0f / (float)(squarei(dr) + squarei(dg) + squarei(db) + .00000125f);
+
+               uint32_t total_err = 0;
+
+               for (uint32_t i = 0; i < 16; i++)
+               {
+                       const int r = pSrc_pixels[i].r;
+                       const int g = pSrc_pixels[i].g;
+                       const int b = pSrc_pixels[i].b;
+
+                       int sel = (int)((float)((r - (int)block_r[0]) * dr + (g - (int)block_g[0]) * dg + (b - (int)block_b[0]) * db) * f + .5f);
+                       sel = clampi(sel, 1, 3);
+
+                       uint32_t err0 = squarei((int)block_r[sel - 1] - (int)r) + squarei((int)block_g[sel - 1] - (int)g) + squarei((int)block_b[sel - 1] - (int)b);
+                       uint32_t err1 = squarei((int)block_r[sel] - (int)r) + squarei((int)block_g[sel] - (int)g) + squarei((int)block_b[sel] - (int)b);
+                                               
+                       int best_sel = sel;
+                       uint32_t best_err = err1;
+                       if (err0 == err1)
+                       {
+                               // Prefer non-interpolation
+                               if ((best_sel - 1) == 0)
+                                       best_sel = 0;
+                       }
+                       else if (err0 < best_err)
+                       {
+                               best_sel = sel - 1;
+                               best_err = err0;
+                       }
+                       
+                       total_err += best_err;
+                                               
+                       if (total_err >= cur_err)
+                               break;
+                       
+                       sels[i] = (uint8_t)best_sel;
+               }
+               return total_err;
+       }
+
+       static inline uint32_t bc1_find_sels4_fullerr(const color32* pSrc_pixels, uint32_t lr, uint32_t lg, uint32_t lb, uint32_t hr, uint32_t hg, uint32_t hb, uint8_t sels[16], uint32_t cur_err)
+       {
+               uint32_t block_r[4], block_g[4], block_b[4];
+               bc1_get_block_colors4(block_r, block_g, block_b, lr, lg, lb, hr, hg, hb);
+                               
+               uint32_t total_err = 0;
+
+               for (uint32_t i = 0; i < 16; i++)
+               {
+                       const int r = pSrc_pixels[i].r;
+                       const int g = pSrc_pixels[i].g;
+                       const int b = pSrc_pixels[i].b;
+
+                       uint32_t best_err = squarei((int)block_r[0] - (int)r) + squarei((int)block_g[0] - (int)g) + squarei((int)block_b[0] - (int)b);
+                       uint8_t best_sel = 0;
+                       
+                       for (uint32_t j = 1; (j < 4) && best_err; j++)
+                       {
+                               uint32_t err = squarei((int)block_r[j] - (int)r) + squarei((int)block_g[j] - (int)g) + squarei((int)block_b[j] - (int)b);
+                               if ( (err < best_err) || ((err == best_err) && (j == 3)) )
+                               {
+                                       best_err = err;
+                                       best_sel = (uint8_t)j;
+                               }
+                       }
+                       
+                       total_err += best_err;
+                                               
+                       if (total_err >= cur_err)
+                               break;
+                       
+                       sels[i] = (uint8_t)best_sel;
+               }
+               return total_err;
+       }
+
+       static inline uint32_t bc1_find_sels4(uint32_t flags, const color32* pSrc_pixels, uint32_t lr, uint32_t lg, uint32_t lb, uint32_t hr, uint32_t hg, uint32_t hb, uint8_t sels[16], uint32_t cur_err)
+       {
+               uint32_t err;
+
+               if (flags & cEncodeBC1UseFasterMSEEval)
+                       err = bc1_find_sels4_fasterr(pSrc_pixels, lr, lg, lb, hr, hg, hb, sels, cur_err);
+               else if (flags & cEncodeBC1UseFullMSEEval)
+                       err = bc1_find_sels4_fullerr(pSrc_pixels, lr, lg, lb, hr, hg, hb, sels, cur_err);
+               else
+                       err = bc1_find_sels4_check2_err(pSrc_pixels, lr, lg, lb, hr, hg, hb, sels, cur_err);
+
+               return err;
+       }
+               
+       static inline uint32_t bc1_find_sels3_fullerr(bool use_black, const color32* pSrc_pixels, uint32_t lr, uint32_t lg, uint32_t lb, uint32_t hr, uint32_t hg, uint32_t hb, uint8_t sels[16], uint32_t cur_err)
+       {
+               uint32_t block_r[3], block_g[3], block_b[3];
+               bc1_get_block_colors3(block_r, block_g, block_b, lr, lg, lb, hr, hg, hb);
+                                                               
+               uint32_t total_err = 0;
+
+               for (uint32_t i = 0; i < 16; i++)
+               {
+                       const int r = pSrc_pixels[i].r;
+                       const int g = pSrc_pixels[i].g;
+                       const int b = pSrc_pixels[i].b;
+
+                       uint32_t best_err = squarei((int)block_r[0] - (int)r) + squarei((int)block_g[0] - (int)g) + squarei((int)block_b[0] - (int)b);
+                       uint32_t best_sel = 0;
+
+                       uint32_t err1 = squarei((int)block_r[1] - (int)r) + squarei((int)block_g[1] - (int)g) + squarei((int)block_b[1] - (int)b);
+                       if (err1 < best_err)
+                       {
+                               best_err = err1;
+                               best_sel = 1;
+                       }
+
+                       uint32_t err2 = squarei((int)block_r[2] - (int)r) + squarei((int)block_g[2] - (int)g) + squarei((int)block_b[2] - (int)b);
+                       if (err2 < best_err)
+                       {
+                               best_err = err2;
+                               best_sel = 2;
+                       }
+
+                       if (use_black)
+                       {
+                               uint32_t err3 = squarei(r) + squarei(g) + squarei(b);
+                               if (err3 < best_err)
+                               {
+                                       best_err = err3;
+                                       best_sel = 3;
+                               }
+                       }
+                       
+                       total_err += best_err;
+                       if (total_err >= cur_err)
+                               return total_err;
+                       
+                       sels[i] = (uint8_t)best_sel;
+               }
+
+               return total_err;
+       }
+
+       static inline void precise_round_565(const vec3F &xl, const vec3F &xh, 
+               int &trial_lr, int &trial_lg, int &trial_lb,
+               int &trial_hr, int &trial_hg, int &trial_hb)
+       {
+               trial_lr = (int)(xl.c[0] * 31.0f); 
+               trial_lg = (int)(xl.c[1] * 63.0f); 
+               trial_lb = (int)(xl.c[2] * 31.0f); 
+
+               trial_hr = (int)(xh.c[0] * 31.0f); 
+               trial_hg = (int)(xh.c[1] * 63.0f); 
+               trial_hb = (int)(xh.c[2] * 31.0f); 
+
+               if ((uint32_t)(trial_lr | trial_lb | trial_hr | trial_hb) > 31U)
+               {
+                       trial_lr = ((uint32_t)trial_lr > 31U) ? (~trial_lr >> 31) & 31 : trial_lr;
+                       trial_hr = ((uint32_t)trial_hr > 31U) ? (~trial_hr >> 31) & 31 : trial_hr;
+
+                       trial_lb = ((uint32_t)trial_lb > 31U) ? (~trial_lb >> 31) & 31 : trial_lb;
+                       trial_hb = ((uint32_t)trial_hb > 31U) ? (~trial_hb >> 31) & 31 : trial_hb;
+               }
+
+               if ((uint32_t)(trial_lg | trial_hg) > 63U)
+               {
+                       trial_lg = ((uint32_t)trial_lg > 63U) ? (~trial_lg >> 31) & 63 : trial_lg;
+                       trial_hg = ((uint32_t)trial_hg > 63U) ? (~trial_hg >> 31) & 63 : trial_hg;
+               }
+
+               trial_lr = (trial_lr + (xl.c[0] > g_midpoint5[trial_lr])) & 31;
+               trial_lg = (trial_lg + (xl.c[1] > g_midpoint6[trial_lg])) & 63;
+               trial_lb = (trial_lb + (xl.c[2] > g_midpoint5[trial_lb])) & 31;
+                               
+               trial_hr = (trial_hr + (xh.c[0] > g_midpoint5[trial_hr])) & 31;
+               trial_hg = (trial_hg + (xh.c[1] > g_midpoint6[trial_hg])) & 63;
+               trial_hb = (trial_hb + (xh.c[2] > g_midpoint5[trial_hb])) & 31;
+       }
+
+       static inline void precise_round_565_noscale(vec3F xl, vec3F xh, 
+               int &trial_lr, int &trial_lg, int &trial_lb,
+               int &trial_hr, int &trial_hg, int &trial_hb)
+       {
+               xl.c[0] *= 1.0f/255.0f;
+               xl.c[1] *= 1.0f/255.0f;
+               xl.c[2] *= 1.0f/255.0f;
+
+               xh.c[0] *= 1.0f/255.0f;
+               xh.c[1] *= 1.0f/255.0f;
+               xh.c[2] *= 1.0f/255.0f;
+
+               precise_round_565(xl, xh, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb);
+       }
+
+       static inline void bc1_encode4(bc1_block *pDst_block, int lr, int lg, int lb, int hr, int hg, int hb, const uint8_t sels[16])
+       {
+               uint32_t lc16 = bc1_block::pack_unscaled_color(lr, lg, lb);
+               uint32_t hc16 = bc1_block::pack_unscaled_color(hr, hg, hb);
+                               
+               // Always forbid 3 color blocks
+               if (lc16 == hc16)
+               {
+                       uint8_t mask = 0;
+
+                       // Make l > h
+                       if (hc16 > 0)
+                               hc16--;
+                       else
+                       {
+                               // lc16 = hc16 = 0
+                               assert(lc16 == hc16 && hc16 == 0);
+
+                               hc16 = 0;
+                               lc16 = 1;
+                               mask = 0x55; // select hc16
+                       }
+
+                       assert(lc16 > hc16);
+                       pDst_block->set_low_color(static_cast<uint16_t>(lc16));
+                       pDst_block->set_high_color(static_cast<uint16_t>(hc16));
+
+                       pDst_block->m_selectors[0] = mask;
+                       pDst_block->m_selectors[1] = mask;
+                       pDst_block->m_selectors[2] = mask;
+                       pDst_block->m_selectors[3] = mask;
+               }
+               else
+               {
+                       uint8_t invert_mask = 0;
+                       if (lc16 < hc16)
+                       {
+                               std::swap(lc16, hc16);
+                               invert_mask = 0x55;
+                       }
+
+                       assert(lc16 > hc16);
+                       pDst_block->set_low_color((uint16_t)lc16);
+                       pDst_block->set_high_color((uint16_t)hc16);
+
+                       uint32_t packed_sels = 0;
+                       static const uint8_t s_sel_trans[4] = { 0, 2, 3, 1 };
+                       for (uint32_t i = 0; i < 16; i++)
+                               packed_sels |= ((uint32_t)s_sel_trans[sels[i]] << (i * 2));
+
+                       pDst_block->m_selectors[0] = (uint8_t)packed_sels ^ invert_mask;
+                       pDst_block->m_selectors[1] = (uint8_t)(packed_sels >> 8) ^ invert_mask;
+                       pDst_block->m_selectors[2] = (uint8_t)(packed_sels >> 16) ^ invert_mask;
+                       pDst_block->m_selectors[3] = (uint8_t)(packed_sels >> 24) ^ invert_mask;
+               }
+       }
+
+       static inline void bc1_encode3(bc1_block *pDst_block, int lr, int lg, int lb, int hr, int hg, int hb, const uint8_t sels[16])
+       {
+               uint32_t lc16 = bc1_block::pack_unscaled_color(lr, lg, lb);
+               uint32_t hc16 = bc1_block::pack_unscaled_color(hr, hg, hb);
+
+               bool invert_flag = false;
+               if (lc16 > hc16)
+               {
+                       std::swap(lc16, hc16);
+                       invert_flag = true;
+               }
+
+               assert(lc16 <= hc16);
+               
+               pDst_block->set_low_color((uint16_t)lc16);
+               pDst_block->set_high_color((uint16_t)hc16);
+
+               uint32_t packed_sels = 0;
+                       
+               if (invert_flag)
+               {
+                       static const uint8_t s_sel_trans_inv[4] = { 1, 0, 2, 3 };
+                               
+                       for (uint32_t i = 0; i < 16; i++)
+                               packed_sels |= ((uint32_t)s_sel_trans_inv[sels[i]] << (i * 2));
+               }
+               else
+               {
+                       for (uint32_t i = 0; i < 16; i++)
+                               packed_sels |= ((uint32_t)sels[i] << (i * 2));
+               }
+
+               pDst_block->m_selectors[0] = (uint8_t)packed_sels;
+               pDst_block->m_selectors[1] = (uint8_t)(packed_sels >> 8);
+               pDst_block->m_selectors[2] = (uint8_t)(packed_sels >> 16);
+               pDst_block->m_selectors[3] = (uint8_t)(packed_sels >> 24);
+       }
+       
+       struct bc1_encode_results
+       {
+               int lr, lg, lb;
+               int hr, hg, hb;
+               uint8_t sels[16];
+               bool m_3color;
+       };
+       
+       static bool try_3color_block_useblack(const color32* pSrc_pixels, uint32_t flags, uint32_t &cur_err, bc1_encode_results &results)
+       {
+               int total_r = 0, total_g = 0, total_b = 0;
+               int max_r = 0, max_g = 0, max_b = 0;
+               int min_r = 255, min_g = 255, min_b = 255;
+               int total_pixels = 0;
+               for (uint32_t i = 0; i < 16; i++)
+               {
+                       const int r = pSrc_pixels[i].r, g = pSrc_pixels[i].g, b = pSrc_pixels[i].b;
+                       if ((r | g | b) < 4)
+                               continue;
+                       
+                       max_r = std::max(max_r, r); max_g = std::max(max_g, g); max_b = std::max(max_b, b);
+                       min_r = std::min(min_r, r); min_g = std::min(min_g, g); min_b = std::min(min_b, b);
+                       total_r += r; total_g += g; total_b += b;
+                               
+                       total_pixels++;
+               }
+
+               if (!total_pixels)
+                       return false;
+
+               int half_total_pixels = total_pixels >> 1;
+               int avg_r = (total_r + half_total_pixels) / total_pixels;
+               int avg_g = (total_g + half_total_pixels) / total_pixels;
+               int avg_b = (total_b + half_total_pixels) / total_pixels;
+
+               uint32_t low_c = 0, high_c = 0;
+
+               int icov[6] = { 0, 0, 0, 0, 0, 0 };
+               for (uint32_t i = 0; i < 16; i++)
+               {
+                       int r = (int)pSrc_pixels[i].r;
+                       int g = (int)pSrc_pixels[i].g;
+                       int b = (int)pSrc_pixels[i].b;
+
+                       if ((r | g | b) < 4)
+                               continue;
+
+                       r -= avg_r;
+                       g -= avg_g;
+                       b -= avg_b;
+
+                       icov[0] += r * r;
+                       icov[1] += r * g;
+                       icov[2] += r * b;
+                       icov[3] += g * g;
+                       icov[4] += g * b;
+                       icov[5] += b * b;
+               }
+
+               float cov[6];
+               for (uint32_t i = 0; i < 6; i++)
+                       cov[i] = (float)(icov[i]) * (1.0f / 255.0f);
+                       
+               float xr = (float)(max_r - min_r);
+               float xg = (float)(max_g - min_g);
+               float xb = (float)(max_b - min_b);
+               
+               if (icov[2] < 0)
+                       xr = -xr;
+
+               if (icov[4] < 0)
+                       xg = -xg;
+
+               for (uint32_t power_iter = 0; power_iter < 4; power_iter++)
+               {
+                       float r = xr * cov[0] + xg * cov[1] + xb * cov[2];
+                       float g = xr * cov[1] + xg * cov[3] + xb * cov[4];
+                       float b = xr * cov[2] + xg * cov[4] + xb * cov[5];
+                       xr = r; xg = g; xb = b;
+               }
+
+               float k = maximum(fabsf(xr), fabsf(xg), fabsf(xb));
+               int saxis_r = 306, saxis_g = 601, saxis_b = 117;
+               if (k >= 2)
+               {
+                       float m = 1024.0f / k;
+                       saxis_r = (int)(xr * m);
+                       saxis_g = (int)(xg * m);
+                       saxis_b = (int)(xb * m);
+               }
+                       
+               int low_dot = INT_MAX, high_dot = INT_MIN;
+               for (uint32_t i = 0; i < 16; i++)
+               {
+                       int r = (int)pSrc_pixels[i].r, g = (int)pSrc_pixels[i].g, b = (int)pSrc_pixels[i].b;
+
+                       if ((r | g | b) < 4)
+                               continue;
+
+                       int dot = r * saxis_r + g * saxis_g + b * saxis_b;
+                       if (dot < low_dot)
+                       {
+                               low_dot = dot;
+                               low_c = i;
+                       }
+                       if (dot > high_dot)
+                       {
+                               high_dot = dot;
+                               high_c = i;
+                       }
+               }
+
+               int lr = to_5(pSrc_pixels[low_c].r);
+               int lg = to_6(pSrc_pixels[low_c].g);
+               int lb = to_5(pSrc_pixels[low_c].b);
+
+               int hr = to_5(pSrc_pixels[high_c].r);
+               int hg = to_6(pSrc_pixels[high_c].g);
+               int hb = to_5(pSrc_pixels[high_c].b);
+
+               uint8_t trial_sels[16];
+               uint32_t trial_err = bc1_find_sels3_fullerr(true, pSrc_pixels, lr, lg, lb, hr, hg, hb, trial_sels, UINT32_MAX);
+
+               if (trial_err)
+               {
+                       const uint32_t total_ls_passes = flags & cEncodeBC1TwoLeastSquaresPasses ? 2 : 1;
+                       for (uint32_t trials = 0; trials < total_ls_passes; trials++)
+                       {
+                               vec3F xl, xh;
+                               int lr2, lg2, lb2, hr2, hg2, hb2;
+                               if (!compute_least_squares_endpoints3_rgb(true, pSrc_pixels, trial_sels, &xl, &xh))
+                               {
+                                       lr2 = g_bc1_match5_half[avg_r].m_hi;
+                                       lg2 = g_bc1_match6_half[avg_g].m_hi;
+                                       lb2 = g_bc1_match5_half[avg_b].m_hi;
+
+                                       hr2 = g_bc1_match5_half[avg_r].m_lo;
+                                       hg2 = g_bc1_match6_half[avg_g].m_lo;
+                                       hb2 = g_bc1_match5_half[avg_b].m_lo;
+                               }
+                               else
+                               {
+                                       precise_round_565(xl, xh, hr2, hg2, hb2, lr2, lg2, lb2);
+                               }
+
+                               if ((lr == lr2) && (lg == lg2) && (lb == lb2) && (hr == hr2) && (hg == hg2) && (hb == hb2))
+                                       break;
+                                                               
+                               uint8_t trial_sels2[16];
+                               uint32_t trial_err2 = bc1_find_sels3_fullerr(true, pSrc_pixels, lr2, lg2, lb2, hr2, hg2, hb2, trial_sels2, trial_err);
+                                                                                               
+                               if (trial_err2 < trial_err)
+                               {
+                                       trial_err = trial_err2;
+                                       lr = lr2; lg = lg2; lb = lb2;
+                                       hr = hr2; hg = hg2; hb = hb2;
+                                       memcpy(trial_sels, trial_sels2, sizeof(trial_sels));
+                               }
+                               else
+                                       break;
+                       }
+               }
+
+               if (trial_err < cur_err)
+               {
+                       results.m_3color = true;
+                       results.lr = lr;
+                       results.lg = lg;
+                       results.lb = lb;
+                       results.hr = hr;
+                       results.hg = hg;
+                       results.hb = hb;
+                       memcpy(results.sels, trial_sels, 16);
+                       
+                       cur_err = trial_err;
+                                               
+                       return true;
+               }
+
+               return false;
+       }
+
+       static bool try_3color_block(const color32* pSrc_pixels, uint32_t flags, uint32_t &cur_err, 
+               int avg_r, int avg_g, int avg_b, int lr, int lg, int lb, int hr, int hg, int hb, int total_r, int total_g, int total_b, uint32_t total_orderings_to_try,
+               bc1_encode_results &results)
+       {
+               uint8_t trial_sels[16];
+               uint32_t trial_err = bc1_find_sels3_fullerr(false, pSrc_pixels, lr, lg, lb, hr, hg, hb, trial_sels, UINT32_MAX);
+
+               if (trial_err)
+               {
+                       const uint32_t total_ls_passes = flags & cEncodeBC1TwoLeastSquaresPasses ? 2 : 1;
+                       for (uint32_t trials = 0; trials < total_ls_passes; trials++)
+                       {
+                               vec3F xl, xh;
+                               int lr2, lg2, lb2, hr2, hg2, hb2;
+                               if (!compute_least_squares_endpoints3_rgb(false, pSrc_pixels, trial_sels, &xl, &xh))
+                               {
+                                       lr2 = g_bc1_match5_half[avg_r].m_hi;
+                                       lg2 = g_bc1_match6_half[avg_g].m_hi;
+                                       lb2 = g_bc1_match5_half[avg_b].m_hi;
+
+                                       hr2 = g_bc1_match5_half[avg_r].m_lo;
+                                       hg2 = g_bc1_match6_half[avg_g].m_lo;
+                                       hb2 = g_bc1_match5_half[avg_b].m_lo;
+                               }
+                               else
+                               {
+                                       precise_round_565(xl, xh, hr2, hg2, hb2, lr2, lg2, lb2);
+                               }
+
+                               if ((lr == lr2) && (lg == lg2) && (lb == lb2) && (hr == hr2) && (hg == hg2) && (hb == hb2))
+                                       break;
+                                                                                               
+                               uint8_t trial_sels2[16];
+                               uint32_t trial_err2 = bc1_find_sels3_fullerr(false, pSrc_pixels, lr2, lg2, lb2, hr2, hg2, hb2, trial_sels2, trial_err);
+                                                                                               
+                               if (trial_err2 < trial_err)
+                               {
+                                       trial_err = trial_err2;
+                                       lr = lr2; lg = lg2; lb = lb2;
+                                       hr = hr2; hg = hg2; hb = hb2;
+                                       memcpy(trial_sels, trial_sels2, sizeof(trial_sels));
+                               }
+                               else
+                                       break;
+                       }
+               }
+
+               if ((trial_err) && (flags & cEncodeBC1UseLikelyTotalOrderings) && (total_orderings_to_try))
+               {
+                       hist3 h;
+                       for (uint32_t i = 0; i < 16; i++)
+                       {
+                               assert(trial_sels[i] < 3);
+                               h.m_hist[trial_sels[i]]++;
+                       }
+
+                       const uint32_t orig_total_order_index = h.lookup_total_ordering_index();
+
+                       int r0, g0, b0, r3, g3, b3;
+                       r0 = (lr << 3) | (lr >> 2); g0 = (lg << 2) | (lg >> 4); b0 = (lb << 3) | (lb >> 2);
+                       r3 = (hr << 3) | (hr >> 2); g3 = (hg << 2) | (hg >> 4); b3 = (hb << 3) | (hb >> 2);
+
+                       int ar = r3 - r0, ag = g3 - g0, ab = b3 - b0;
+                                                                                                                               
+                       int dots[16];
+                       for (uint32_t i = 0; i < 16; i++)
+                       {
+                               int r = pSrc_pixels[i].r;
+                               int g = pSrc_pixels[i].g;
+                               int b = pSrc_pixels[i].b;
+                               int d = 0x1000000 + (r * ar + g * ag + b * ab);
+                               assert(d >= 0);
+                               dots[i] = (d << 4) + i;
+                       }
+
+                       std::sort(dots, dots + 16);
+
+                       uint32_t r_sum[17], g_sum[17], b_sum[17];
+                       uint32_t r = 0, g = 0, b = 0;
+                       for (uint32_t i = 0; i < 16; i++)
+                       {
+                               const uint32_t p = dots[i] & 15;
+
+                               r_sum[i] = r;
+                               g_sum[i] = g;
+                               b_sum[i] = b;
+
+                               r += pSrc_pixels[p].r;
+                               g += pSrc_pixels[p].g;
+                               b += pSrc_pixels[p].b;
+                       }
+
+                       r_sum[16] = total_r;
+                       g_sum[16] = total_g;
+                       b_sum[16] = total_b;
+                                               
+                       const uint32_t q_total = (flags & cEncodeBC1Exhaustive) ? NUM_UNIQUE_TOTAL_ORDERINGS3 : std::min(total_orderings_to_try, MAX_TOTAL_ORDERINGS3);
+                       for (uint32_t q = 0; q < q_total; q++)
+                       {
+                               const uint32_t s = (flags & cEncodeBC1Exhaustive) ? q : g_best_total_orderings3[orig_total_order_index][q];
+
+                               int trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb;
+
+                               vec3F xl, xh;
+
+                               if ((s == TOTAL_ORDER_3_0_16) || (s == TOTAL_ORDER_3_1_16) || (s == TOTAL_ORDER_3_2_16))
+                               {
+                                       trial_lr = g_bc1_match5_half[avg_r].m_hi;
+                                       trial_lg = g_bc1_match6_half[avg_g].m_hi;
+                                       trial_lb = g_bc1_match5_half[avg_b].m_hi;
+
+                                       trial_hr = g_bc1_match5_half[avg_r].m_lo;
+                                       trial_hg = g_bc1_match6_half[avg_g].m_lo;
+                                       trial_hb = g_bc1_match5_half[avg_b].m_lo;
+                               }
+                               else
+                               {
+                                       compute_least_squares_endpoints3_rgb(&xl, &xh, total_r, total_g, total_b, 
+                                               g_selector_factors3[s][0], g_selector_factors3[s][1], g_selector_factors3[s][2], s, r_sum, g_sum, b_sum);
+                                       
+                                       precise_round_565(xl, xh, trial_hr, trial_hg, trial_hb, trial_lr, trial_lg, trial_lb);
+                               }
+
+                               uint8_t trial_sels2[16];
+                               uint32_t trial_err2 = bc1_find_sels3_fullerr(false, pSrc_pixels, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb, trial_sels2, UINT32_MAX);
+                               
+                               if (trial_err2 < trial_err)
+                               {
+                                       trial_err = trial_err2;
+
+                                       lr = trial_lr;
+                                       lg = trial_lg;
+                                       lb = trial_lb;
+
+                                       hr = trial_hr;
+                                       hg = trial_hg;
+                                       hb = trial_hb;
+
+                                       memcpy(trial_sels, trial_sels2, sizeof(trial_sels));
+                               }
+
+                       } // s
+               }
+
+               if (trial_err < cur_err)
+               {
+                       results.m_3color = true;
+                       results.lr = lr;
+                       results.lg = lg;
+                       results.lb = lb;
+                       results.hr = hr;
+                       results.hg = hg;
+                       results.hb = hb;
+                       memcpy(results.sels, trial_sels, 16);
+                       
+                       cur_err = trial_err;
+
+                       return true;
+               }
+
+               return false;
+       }
+
+       void encode_bc1(uint32_t level, void* pDst, const uint8_t* pPixels, bool allow_3color, bool allow_transparent_texels_for_black)
+       {
+               uint32_t flags = 0, total_orderings4 = 1, total_orderings3 = 1;
+
+               static_assert(MAX_TOTAL_ORDERINGS3 >= 32, "MAX_TOTAL_ORDERINGS3 >= 32");
+               static_assert(MAX_TOTAL_ORDERINGS4 >= 32, "MAX_TOTAL_ORDERINGS4 >= 32");
+
+               switch (level)
+               {
+               case 0:
+                       // Faster/higher quality than stb_dxt default.
+                       flags = cEncodeBC1BoundingBoxInt;
+                       break;
+               case 1:
+                       // Faster/higher quality than stb_dxt default. A bit higher average quality vs. mode 0.
+                       flags = cEncodeBC1Use2DLS;
+                       break;
+               case 2:
+                       // On average mode 2 is a little weaker than modes 0/1, but it's stronger on outliers (very tough textures).
+                       // Slightly stronger than stb_dxt.
+                       flags = 0;
+                       break;
+               case 3:
+                       // Slightly stronger than stb_dxt HIGHQUAL.
+                       flags = cEncodeBC1TwoLeastSquaresPasses;
+                       break;
+               case 4:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFullMSEEval | cEncodeBC1Use6PowerIters;
+                       break;
+               default:
+               case 5:
+                       // stb_dxt HIGHQUAL + permit 3 color (if it's enabled).
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFasterMSEEval;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       break;
+               case 6:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFasterMSEEval | cEncodeBC1UseLikelyTotalOrderings;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       break;
+               case 7:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFasterMSEEval | cEncodeBC1UseLikelyTotalOrderings;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = 4;
+                       break;
+               case 8:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFasterMSEEval | cEncodeBC1UseLikelyTotalOrderings;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = 8;
+                       break;
+               case 9:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseLikelyTotalOrderings;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = 11;
+                       total_orderings3 = 3;
+                       break;
+               case 10:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseLikelyTotalOrderings;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = 20;
+                       total_orderings3 = 8;
+                       break;
+               case 11:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseLikelyTotalOrderings;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = 28;
+                       total_orderings3 = 16;
+                       break;
+               case 12:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseLikelyTotalOrderings;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = 32;
+                       total_orderings3 = 32;
+                       break;
+               case 13:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFullMSEEval | cEncodeBC1UseLikelyTotalOrderings | cEncodeBC1Use6PowerIters | (20 << cEncodeBC1EndpointSearchRoundsShift) | cEncodeBC1TryAllInitialEndponts;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = 32;
+                       total_orderings3 = 32;
+                       break;
+               case 14:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFullMSEEval | cEncodeBC1UseLikelyTotalOrderings | cEncodeBC1Use6PowerIters | (32 << cEncodeBC1EndpointSearchRoundsShift) | cEncodeBC1TryAllInitialEndponts;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = 32;
+                       total_orderings3 = 32;
+                       break;
+               case 15:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFullMSEEval | cEncodeBC1UseLikelyTotalOrderings | cEncodeBC1Use6PowerIters | (32 << cEncodeBC1EndpointSearchRoundsShift) | cEncodeBC1TryAllInitialEndponts;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = ((((32 + MAX_TOTAL_ORDERINGS4) / 2) + 32) / 2);
+                       total_orderings3 = 32;
+                       break;
+               case 16:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFullMSEEval | cEncodeBC1UseLikelyTotalOrderings | cEncodeBC1Use6PowerIters | (256 << cEncodeBC1EndpointSearchRoundsShift) | cEncodeBC1TryAllInitialEndponts;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = (32 + MAX_TOTAL_ORDERINGS4) / 2;
+                       total_orderings3 = 32;
+                       break;
+               case 17:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFullMSEEval | cEncodeBC1UseLikelyTotalOrderings | cEncodeBC1Use6PowerIters | (256 << cEncodeBC1EndpointSearchRoundsShift) | cEncodeBC1TryAllInitialEndponts;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = MAX_TOTAL_ORDERINGS4;
+                       total_orderings3 = 32;
+                       break;
+               case 18:
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFullMSEEval | cEncodeBC1UseLikelyTotalOrderings | cEncodeBC1Use6PowerIters | cEncodeBC1Iterative | (256 << cEncodeBC1EndpointSearchRoundsShift) | cEncodeBC1TryAllInitialEndponts;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = MAX_TOTAL_ORDERINGS4;
+                       total_orderings3 = 32;
+                       break;
+               case 19:
+                       // This hidden mode is *extremely* slow and abuses the encoder. It's just for testing/training.
+                       flags = cEncodeBC1TwoLeastSquaresPasses | cEncodeBC1UseFullMSEEval | cEncodeBC1UseLikelyTotalOrderings | cEncodeBC1Use6PowerIters | cEncodeBC1Exhaustive | cEncodeBC1Iterative | (256 << cEncodeBC1EndpointSearchRoundsShift) | cEncodeBC1TryAllInitialEndponts;
+                       flags |= (allow_3color ? cEncodeBC1Use3ColorBlocks : 0) | (allow_transparent_texels_for_black ? cEncodeBC1Use3ColorBlocksForBlackPixels : 0);
+                       total_orderings4 = 32;
+                       total_orderings3 = 32;
+                       break;
+               }
+
+               encode_bc1(pDst, pPixels, flags, total_orderings4, total_orderings3);
+       }
+
+       static inline void encode_bc1_pick_initial(const color32 *pSrc_pixels, uint32_t flags, bool grayscale_flag,
+                       int min_r, int min_g, int min_b, int max_r, int max_g, int max_b, 
+                       int avg_r, int avg_g, int avg_b, int total_r, int total_g, int total_b,
+                       int &lr, int &lg, int &lb, int &hr, int &hg, int &hb)
+       {
+               if (grayscale_flag) 
+               {
+                       const int fr = pSrc_pixels[0].r;
+
+                       // Grayscale blocks are a common enough case to specialize.
+                       if ((max_r - min_r) < 2)
+                       {
+                               lr = lb = hr = hb = to_5(fr);
+                               lg = hg = to_6(fr);
+                       }
+                       else
+                       {
+                               lr = lb = to_5(min_r);
+                               lg = to_6(min_r);
+
+                               hr = hb = to_5(max_r);
+                               hg = to_6(max_r);
+                       }
+               }
+               else if (flags & cEncodeBC1Use2DLS)
+               {
+                       //  2D Least Squares approach from Humus's example, with added inset and optimal rounding.
+                       int big_chan = 0, min_chan_val = min_r, max_chan_val = max_r;
+                       if ((max_g - min_g) > (max_chan_val - min_chan_val))
+                               big_chan = 1, min_chan_val = min_g, max_chan_val = max_g;
+
+                       if ((max_b - min_b) > (max_chan_val - min_chan_val))
+                               big_chan = 2, min_chan_val = min_b, max_chan_val = max_b;
+               
+                       int sum_xy_r = 0, sum_xy_g = 0, sum_xy_b = 0;
+                       vec3F l, h;
+                       if (big_chan == 0)
+                       {
+                               for (uint32_t i = 0; i < 16; i++)
+                               {
+                                       const int r = pSrc_pixels[i].r, g = pSrc_pixels[i].g, b = pSrc_pixels[i].b;
+                                       sum_xy_r += r * r, sum_xy_g += r * g, sum_xy_b += r * b;
+                               }
+
+                               int sum_x = total_r;
+                               int sum_x2 = sum_xy_r;
+
+                               float div = (float)(16 * sum_x2 - sum_x * sum_x);
+                               float b_y = 0.0f, b_z = 0.0f;
+                               if (fabs(div) > 1e-8f)
+                               {
+                                       div = 1.0f / div;
+                                       b_y = (16 * sum_xy_g - sum_x * total_g) * div;
+                                       b_z = (16 * sum_xy_b - sum_x * total_b) * div;
+                               }
+
+                               float a_y = (total_g - b_y * sum_x) / 16.0f;
+                               float a_z = (total_b - b_z * sum_x) / 16.0f;
+                                                               
+                               l.c[1] = a_y + b_y * min_chan_val;
+                               l.c[2] = a_z + b_z * min_chan_val;
+
+                               h.c[1] = a_y + b_y * max_chan_val;
+                               h.c[2] = a_z + b_z * max_chan_val;
+
+                               float dg = (h.c[1] - l.c[1]);
+                               float db = (h.c[2] - l.c[2]);
+                               
+                               h.c[1] = l.c[1] + dg * (15.0f/16.0f);
+                               h.c[2] = l.c[2] + db * (15.0f/16.0f);
+
+                               l.c[1] = l.c[1] + dg * (1.0f/16.0f);
+                               l.c[2] = l.c[2] + db * (1.0f/16.0f);
+                                                               
+                               float d = (float)(max_chan_val - min_chan_val);
+                               float fmin_chan_val = min_chan_val + d * (1.0f/16.0f);
+                               float fmax_chan_val = min_chan_val + d * (15.0f/16.0f);
+
+                               l.c[0] = fmin_chan_val;
+                               h.c[0] = fmax_chan_val;
+                       }
+                       else if (big_chan == 1)
+                       {
+                               for (uint32_t i = 0; i < 16; i++)
+                               {
+                                       const int r = pSrc_pixels[i].r, g = pSrc_pixels[i].g, b = pSrc_pixels[i].b;
+                                       sum_xy_r += g * r, sum_xy_g += g * g, sum_xy_b += g * b;
+                               }
+
+                               int sum_x = total_g;
+                               int sum_x2 = sum_xy_g;
+
+                               float div = (float)(16 * sum_x2 - sum_x * sum_x);
+                               float b_x = 0.0f, b_z = 0.0f;
+                               if (fabs(div) > 1e-8f)
+                               {
+                                       div = 1.0f / div;
+                                       b_x = (16 * sum_xy_r - sum_x * total_r) * div;
+                                       b_z = (16 * sum_xy_b - sum_x * total_b) * div;
+                               }
+
+                               float a_x = (total_r - b_x * sum_x) / 16.0f;
+                               float a_z = (total_b - b_z * sum_x) / 16.0f;
+
+                               l.c[0] = a_x + b_x * min_chan_val;
+                               l.c[2] = a_z + b_z * min_chan_val;
+
+                               h.c[0] = a_x + b_x * max_chan_val;
+                               h.c[2] = a_z + b_z * max_chan_val;
+
+                               float dr = (h.c[0] - l.c[0]);
+                               float db = (h.c[2] - l.c[2]);
+                               
+                               h.c[0] = l.c[0] + dr * (15.0f/16.0f);
+                               h.c[2] = l.c[2] + db * (15.0f/16.0f);
+
+                               l.c[0] = l.c[0] + dr * (1.0f/16.0f);
+                               l.c[2] = l.c[2] + db * (1.0f/16.0f);
+                                                               
+                               float d = (float)(max_chan_val - min_chan_val);
+                               float fmin_chan_val = min_chan_val + d * (1.0f/16.0f);
+                               float fmax_chan_val = min_chan_val + d * (15.0f/16.0f);
+
+                               l.c[1] = fmin_chan_val;
+                               h.c[1] = fmax_chan_val;
+                       }
+                       else
+                       {
+                               for (uint32_t i = 0; i < 16; i++)
+                               {
+                                       const int r = pSrc_pixels[i].r, g = pSrc_pixels[i].g, b = pSrc_pixels[i].b;
+                                       sum_xy_r += b * r, sum_xy_g += b * g, sum_xy_b += b * b;
+                               }
+
+                               int sum_x = total_b;
+                               int sum_x2 = sum_xy_b;
+
+                               float div = (float)(16 * sum_x2 - sum_x * sum_x);
+                               float b_x = 0.0f, b_y = 0.0f;
+                               if (fabs(div) > 1e-8f)
+                               {
+                                       div = 1.0f / div;
+                                       b_x = (16 * sum_xy_r - sum_x * total_r) * div;
+                                       b_y = (16 * sum_xy_g - sum_x * total_g) * div;
+                               }
+
+                               float a_x = (total_r - b_x * sum_x) / 16.0f;
+                               float a_y = (total_g - b_y * sum_x) / 16.0f;
+
+                               l.c[0] = a_x + b_x * min_chan_val;
+                               l.c[1] = a_y + b_y * min_chan_val;
+
+                               h.c[0] = a_x + b_x * max_chan_val;
+                               h.c[1] = a_y + b_y * max_chan_val;
+
+                               float dr = (h.c[0] - l.c[0]);
+                               float dg = (h.c[1] - l.c[1]);
+                               
+                               h.c[0] = l.c[0] + dr * (15.0f/16.0f);
+                               h.c[1] = l.c[1] + dg * (15.0f/16.0f);
+
+                               l.c[0] = l.c[0] + dr * (1.0f/16.0f);
+                               l.c[1] = l.c[1] + dg * (1.0f/16.0f);
+
+                               float d = (float)(max_chan_val - min_chan_val);
+                               float fmin_chan_val = min_chan_val + d * (1.0f/16.0f);
+                               float fmax_chan_val = min_chan_val + d * (15.0f/16.0f);
+
+                               l.c[2] = fmin_chan_val;
+                               h.c[2] = fmax_chan_val;
+                       }
+
+                       precise_round_565_noscale(l, h, lr, lg, lb, hr, hg, hb);
+               }
+               else if (flags & cEncodeBC1BoundingBox)
+               {
+                       // Algorithm from icbc.h compress_dxt1_fast()
+                       vec3F l, h;
+                       l.c[0] = min_r * (1.0f/255.0f);
+                       l.c[1] = min_g * (1.0f/255.0f);
+                       l.c[2] = min_b * (1.0f/255.0f);
+
+                       h.c[0] = max_r * (1.0f/255.0f);
+                       h.c[1] = max_g * (1.0f/255.0f);
+                       h.c[2] = max_b * (1.0f/255.0f);
+
+                       const float bias = 8.0f / 255.0f;
+                       float inset_r = (h.c[0] - l.c[0] - bias) * (1.0f/16.0f);
+                       float inset_g = (h.c[1] - l.c[1] - bias) * (1.0f/16.0f);
+                       float inset_b = (h.c[2] - l.c[2] - bias) * (1.0f/16.0f);
+                       
+                       l.c[0] = clampf(l.c[0] + inset_r, 0.0f, 1.0f);
+                       l.c[1] = clampf(l.c[1] + inset_g, 0.0f, 1.0f);
+                       l.c[2] = clampf(l.c[2] + inset_b, 0.0f, 1.0f);
+
+                       h.c[0] = clampf(h.c[0] - inset_r, 0.0f, 1.0f);
+                       h.c[1] = clampf(h.c[1] - inset_g, 0.0f, 1.0f);
+                       h.c[2] = clampf(h.c[2] - inset_b, 0.0f, 1.0f);
+
+                       int icov_xz = 0, icov_yz = 0;
+                       for (uint32_t i = 0; i < 16; i++)
+                       {
+                               int r = (int)pSrc_pixels[i].r - avg_r;
+                               int g = (int)pSrc_pixels[i].g - avg_g;
+                               int b = (int)pSrc_pixels[i].b - avg_b;
+                               icov_xz += r * b;
+                               icov_yz += g * b;
+                       }
+                                                
+                        if (icov_xz < 0)
+                                 std::swap(l.c[0], h.c[0]);
+
+                        if (icov_yz < 0)
+                                 std::swap(l.c[1], h.c[1]);
+
+                        precise_round_565(l, h, lr, lg, lb, hr, hg, hb);
+               }
+               else if (flags & cEncodeBC1BoundingBoxInt)
+               {
+                       // Algorithm from icbc.h compress_dxt1_fast(), but converted to integer.
+                       int inset_r = (max_r - min_r - 8) >> 4;
+                       int inset_g = (max_g - min_g - 8) >> 4;
+                       int inset_b = (max_b - min_b - 8) >> 4;
+
+                       min_r += inset_r;
+                       min_g += inset_g;
+                       min_b += inset_b;
+                       if ((uint32_t)(min_r | min_g | min_b) > 255U)
+                       {
+                               min_r = clampi(min_r, 0, 255);
+                               min_g = clampi(min_g, 0, 255);
+                               min_b = clampi(min_b, 0, 255);
+                       }
+
+                       max_r -= inset_r;
+                       max_g -= inset_g;
+                       max_b -= inset_b;
+                       if ((uint32_t)(max_r | max_g | max_b) > 255U)
+                       {
+                               max_r = clampi(max_r, 0, 255);
+                               max_g = clampi(max_g, 0, 255);
+                               max_b = clampi(max_b, 0, 255);
+                       }
+
+                       int icov_xz = 0, icov_yz = 0;
+                       for (uint32_t i = 0; i < 16; i++)
+                       {
+                               int r = (int)pSrc_pixels[i].r - avg_r;
+                               int g = (int)pSrc_pixels[i].g - avg_g;
+                               int b = (int)pSrc_pixels[i].b - avg_b;
+                               icov_xz += r * b;
+                               icov_yz += g * b;
+                       }
+
+                        int x0 = min_r;
+                        int y0 = min_g;
+                        int x1 = max_r;
+                        int y1 = max_g;
+
+                        if (icov_xz < 0)
+                                 std::swap(x0, x1);
+
+                        if (icov_yz < 0)
+                                 std::swap(y0, y1);
+                        
+                        lr = to_5(x0);
+                        lg = to_6(y0);
+                        lb = to_5(min_b);
+
+                        hr = to_5(x1);
+                        hg = to_6(y1);
+                        hb = to_5(max_b);
+               }
+               else
+               {
+                       // Select 2 colors along the principle axis. (There must be a faster/simpler way.)
+                       uint32_t low_c = 0, high_c = 0;
+
+                       int icov[6] = { 0, 0, 0, 0, 0, 0 };
+                       for (uint32_t i = 0; i < 16; i++)
+                       {
+                               int r = (int)pSrc_pixels[i].r - avg_r;
+                               int g = (int)pSrc_pixels[i].g - avg_g;
+                               int b = (int)pSrc_pixels[i].b - avg_b;
+                               icov[0] += r * r;
+                               icov[1] += r * g;
+                               icov[2] += r * b;
+                               icov[3] += g * g;
+                               icov[4] += g * b;
+                               icov[5] += b * b;
+                       }
+                       
+                       int saxis_r = 306, saxis_g = 601, saxis_b = 117;
+
+                       float xr = (float)(max_r - min_r);
+                       float xg = (float)(max_g - min_g);
+                       float xb = (float)(max_b - min_b);
+
+                       if (icov[2] < 0)
+                               xr = -xr;
+
+                       if (icov[4] < 0)
+                               xg = -xg;
+                                               
+                       float cov[6];
+                       for (uint32_t i = 0; i < 6; i++)
+                               cov[i] = (float)(icov[i]) * (1.0f / 255.0f);
+
+                       const uint32_t total_power_iters = (flags & cEncodeBC1Use6PowerIters) ? 6 : 4;
+                       for (uint32_t power_iter = 0; power_iter < total_power_iters; power_iter++)
+                       {
+                               float r = xr * cov[0] + xg * cov[1] + xb * cov[2];
+                               float g = xr * cov[1] + xg * cov[3] + xb * cov[4];
+                               float b = xr * cov[2] + xg * cov[4] + xb * cov[5];
+                               xr = r; xg = g; xb = b;
+                       }
+
+                       float k = maximum(fabsf(xr), fabsf(xg), fabsf(xb));
+                       if (k >= 2)
+                       {
+                               float m = 2048.0f / k;
+                               saxis_r = (int)(xr * m);
+                               saxis_g = (int)(xg * m);
+                               saxis_b = (int)(xb * m);
+                       }
+                                                                                               
+                       int low_dot = INT_MAX, high_dot = INT_MIN;
+
+                       saxis_r = (int)((uint32_t)saxis_r << 4U);
+                       saxis_g = (int)((uint32_t)saxis_g << 4U);
+                       saxis_b = (int)((uint32_t)saxis_b << 4U);
+                       
+                       for (uint32_t i = 0; i < 16; i += 4)
+                       {
+                               int dot0 = ((pSrc_pixels[i].r * saxis_r + pSrc_pixels[i].g * saxis_g + pSrc_pixels[i].b * saxis_b) & ~0xF) + i;
+                               int dot1 = ((pSrc_pixels[i + 1].r * saxis_r + pSrc_pixels[i + 1].g * saxis_g + pSrc_pixels[i + 1].b * saxis_b) & ~0xF) + i + 1;
+                               int dot2 = ((pSrc_pixels[i + 2].r * saxis_r + pSrc_pixels[i + 2].g * saxis_g + pSrc_pixels[i + 2].b * saxis_b) & ~0xF) + i + 2;
+                               int dot3 = ((pSrc_pixels[i + 3].r * saxis_r + pSrc_pixels[i + 3].g * saxis_g + pSrc_pixels[i + 3].b * saxis_b) & ~0xF) + i + 3;
+
+                               int min_d01 = std::min(dot0, dot1);
+                               int max_d01 = std::max(dot0, dot1);
+
+                               int min_d23 = std::min(dot2, dot3);
+                               int max_d23 = std::max(dot2, dot3);
+
+                               int min_d = std::min(min_d01, min_d23);
+                               int max_d = std::max(max_d01, max_d23);
+
+                               low_dot = std::min(low_dot, min_d);
+                               high_dot = std::max(high_dot, max_d);
+                       }
+                       low_c = low_dot & 15;
+                       high_c = high_dot & 15;
+
+                       lr = to_5(pSrc_pixels[low_c].r);
+                       lg = to_6(pSrc_pixels[low_c].g);
+                       lb = to_5(pSrc_pixels[low_c].b);
+
+                       hr = to_5(pSrc_pixels[high_c].r);
+                       hg = to_6(pSrc_pixels[high_c].g);
+                       hb = to_5(pSrc_pixels[high_c].b);
+               }
+       }
+
+       static const int8_t s_adjacent_voxels[16][4] = 
+       {
+               { 1,0,0, 3 },   // 0
+               { 0,1,0, 4 },   // 1
+               { 0,0,1, 5 },   // 2
+               { -1,0,0, 0 },  // 3
+               { 0,-1,0, 1 },  // 4
+               { 0,0,-1, 2 },  // 5
+               { 1,1,0, 9 },   // 6
+               { 1,0,1, 10 },  // 7
+               { 0,1,1, 11 },  // 8
+               { -1,-1,0, 6 }, // 9
+               { -1,0,-1, 7 }, // 10
+               { 0,-1,-1, 8 }, // 11
+               { -1,1,0, 13 }, // 12
+               { 1,-1,0, 12 }, // 13
+               { 0,-1,1, 15 }, // 14
+               { 0,1,-1, 14 }, // 15
+       };
+
+       // From icbc's high quality mode.
+       static inline void encode_bc1_endpoint_search(const color32 *pSrc_pixels, bool any_black_pixels,
+               uint32_t flags, bc1_encode_results &results, uint32_t cur_err)
+       {
+               int &lr = results.lr, &lg = results.lg, &lb = results.lb, &hr = results.hr, &hg = results.hg, &hb = results.hb;
+               uint8_t *sels = results.sels;
+                                               
+               int prev_improvement_index = 0, forbidden_direction = -1;
+               
+               const int endpoint_search_rounds = (flags & cEncodeBC1EndpointSearchRoundsMask) >> cEncodeBC1EndpointSearchRoundsShift;
+               for (int i = 0; i < endpoint_search_rounds; i++)
+               {
+                       assert(s_adjacent_voxels[ s_adjacent_voxels[i & 15][3] ][3] == (i & 15)); 
+                       
+                       if (forbidden_direction == (i & 31))
+                               continue;
+
+                       const int8_t delta[3] = { s_adjacent_voxels[i & 15][0], s_adjacent_voxels[i & 15][1], s_adjacent_voxels[i & 15][2] };
+
+                       int trial_lr = lr, trial_lg = lg, trial_lb = lb, trial_hr = hr, trial_hg = hg, trial_hb = hb;
+
+                       if ((i >> 4) & 1) 
+                       {
+                               trial_lr = clampi(trial_lr + delta[0], 0, 31);
+                               trial_lg = clampi(trial_lg + delta[1], 0, 63);
+                               trial_lb = clampi(trial_lb + delta[2], 0, 31);
+                       }
+                       else 
+                       {
+                               trial_hr = clampi(trial_hr + delta[0], 0, 31);
+                               trial_hg = clampi(trial_hg + delta[1], 0, 63);
+                               trial_hb = clampi(trial_hb + delta[2], 0, 31);
+                       }
+                                                                               
+                       uint8_t trial_sels[16];
+
+                       uint32_t trial_err;
+                       if (results.m_3color)
+                       {
+                               trial_err = bc1_find_sels3_fullerr(
+                                       ((any_black_pixels) && ((flags & cEncodeBC1Use3ColorBlocksForBlackPixels) != 0)),
+                                       pSrc_pixels, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb, trial_sels, cur_err);
+                       }
+                       else
+                       {
+                               trial_err = bc1_find_sels4(flags, pSrc_pixels, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb, trial_sels, cur_err);
+                       }
+
+                       if (trial_err < cur_err)
+                       {
+                               cur_err = trial_err;
+
+                               forbidden_direction = s_adjacent_voxels[i & 15][3] | (i & 16);
+
+                               lr = trial_lr, lg = trial_lg, lb = trial_lb, hr = trial_hr, hg = trial_hg, hb = trial_hb;
+
+                               memcpy(sels, trial_sels, 16);
+                                       
+                               prev_improvement_index = i;
+                       }
+
+                       if (i - prev_improvement_index > 32) 
+                               break;
+               }
+       }
+               
+       void encode_bc1(void* pDst, const uint8_t* pPixels, uint32_t flags, uint32_t total_orderings_to_try, uint32_t total_orderings_to_try3)
+       {
+               assert(g_initialized);
+                               
+               const color32* pSrc_pixels = (const color32*)pPixels;
+               bc1_block* pDst_block = static_cast<bc1_block*>(pDst);
+               
+               int avg_r, avg_g, avg_b, min_r, min_g, min_b, max_r, max_g, max_b;
+                                               
+               const uint32_t fr = pSrc_pixels[0].r, fg = pSrc_pixels[0].g, fb = pSrc_pixels[0].b;
+
+               uint32_t j;
+               for (j = 15; j >= 1; --j)
+                       if ((pSrc_pixels[j].r != fr) || (pSrc_pixels[j].g != fg) || (pSrc_pixels[j].b != fb))
+                               break;
+
+               if (j == 0)
+               {
+                       encode_bc1_solid_block(pDst, fr, fg, fb, (flags & (cEncodeBC1Use3ColorBlocks | cEncodeBC1Use3ColorBlocksForBlackPixels)) != 0);
+                       return;
+               }
+
+               int total_r = fr, total_g = fg, total_b = fb;
+               
+               max_r = fr, max_g = fg, max_b = fb;
+               min_r = fr, min_g = fg, min_b = fb;
+               
+               uint32_t grayscale_flag = (fr == fg) && (fr == fb);
+               uint32_t any_black_pixels = (fr | fg | fb) < 4;
+
+               for (uint32_t i = 1; i < 16; i++)
+               {
+                       const int r = pSrc_pixels[i].r, g = pSrc_pixels[i].g, b = pSrc_pixels[i].b;
+                       
+                       grayscale_flag &= ((r == g) && (r == b));
+                       any_black_pixels |= ((r | g | b) < 4);
+
+                       max_r = std::max(max_r, r); max_g = std::max(max_g, g); max_b = std::max(max_b, b);
+                       min_r = std::min(min_r, r); min_g = std::min(min_g, g); min_b = std::min(min_b, b);
+                       total_r += r; total_g += g; total_b += b;
+               }
+
+               avg_r = (total_r + 8) >> 4, avg_g = (total_g + 8) >> 4, avg_b = (total_b + 8) >> 4;
+
+               bc1_encode_results results;
+               results.m_3color = false;
+
+               uint8_t *sels = results.sels;
+               int &lr = results.lr, &lg = results.lg, &lb = results.lb, &hr = results.hr, &hg = results.hg, &hb = results.hb;
+               int orig_lr = 0, orig_lg = 0, orig_lb = 0, orig_hr = 0, orig_hg = 0, orig_hb = 0;
+
+               lr = 0, lg = 0, lb = 0, hr = 0, hg = 0, hb = 0;
+                                                               
+               const bool needs_block_error = ((flags & (cEncodeBC1UseLikelyTotalOrderings | cEncodeBC1Use3ColorBlocks | cEncodeBC1UseFullMSEEval | cEncodeBC1EndpointSearchRoundsMask)) != 0) ||
+                               (any_black_pixels && ((flags & cEncodeBC1Use3ColorBlocksForBlackPixels) != 0));
+               
+               uint32_t cur_err = UINT32_MAX;
+
+               if (!needs_block_error)
+               {
+                       assert((flags & cEncodeBC1TryAllInitialEndponts) == 0);
+
+                       encode_bc1_pick_initial(pSrc_pixels, flags, grayscale_flag != 0,
+                                       min_r, min_g, min_b, max_r, max_g, max_b, 
+                                       avg_r, avg_g, avg_b, total_r, total_g, total_b,
+                                       lr, lg, lb, hr, hg, hb);
+
+                       orig_lr = lr, orig_lg = lg, orig_lb = lb, orig_hr = hr, orig_hg = hg, orig_hb = hb;
+
+                       bc1_find_sels4_noerr(pSrc_pixels, lr, lg, lb, hr, hg, hb, sels);
+
+                       const uint32_t total_ls_passes = flags & cEncodeBC1TwoLeastSquaresPasses ? 2 : 1;
+                       for (uint32_t ls_pass = 0; ls_pass < total_ls_passes; ls_pass++)
+                       {
+                               int trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb;
+
+                               vec3F xl, xh;
+                               if (!compute_least_squares_endpoints4_rgb(pSrc_pixels, sels, &xl, &xh, total_r, total_g, total_b))
+                               {
+                                       // All selectors equal - treat it as a solid block which should always be equal or better.
+                                       trial_lr = g_bc1_match5_equals_1[avg_r].m_hi;
+                                       trial_lg = g_bc1_match6_equals_1[avg_g].m_hi;
+                                       trial_lb = g_bc1_match5_equals_1[avg_b].m_hi;
+
+                                       trial_hr = g_bc1_match5_equals_1[avg_r].m_lo;
+                                       trial_hg = g_bc1_match6_equals_1[avg_g].m_lo;
+                                       trial_hb = g_bc1_match5_equals_1[avg_b].m_lo;
+
+                                       // In high/higher quality mode, let it try again in case the optimal tables have caused the sels to diverge.
+                               }
+                               else
+                               {
+                                       precise_round_565(xl, xh, trial_hr, trial_hg, trial_hb, trial_lr, trial_lg, trial_lb);
+                               }
+
+                               if ((lr == trial_lr) && (lg == trial_lg) && (lb == trial_lb) && (hr == trial_hr) && (hg == trial_hg) && (hb == trial_hb))
+                                       break;
+                       
+                               bc1_find_sels4_noerr(pSrc_pixels, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb, sels);
+
+                               lr = trial_lr;
+                               lg = trial_lg;
+                               lb = trial_lb;
+                               hr = trial_hr;
+                               hg = trial_hg;
+                               hb = trial_hb;
+
+                       } // ls_pass
+               }
+               else
+               {
+                       const uint32_t total_rounds = (flags & cEncodeBC1TryAllInitialEndponts) ? 2 : 1;
+                       for (uint32_t round = 0; round < total_rounds; round++)
+                       {
+                               uint32_t modified_flags = flags;
+                               if (round == 1)
+                               {
+                                       modified_flags &= ~(cEncodeBC1Use2DLS | cEncodeBC1BoundingBox);
+                                       modified_flags |= cEncodeBC1BoundingBox;
+                               }
+
+                               int round_lr, round_lg, round_lb, round_hr, round_hg, round_hb;
+                               uint8_t round_sels[16];
+
+                               encode_bc1_pick_initial(pSrc_pixels, modified_flags, grayscale_flag != 0,
+                                       min_r, min_g, min_b, max_r, max_g, max_b, 
+                                       avg_r, avg_g, avg_b, total_r, total_g, total_b,
+                                       round_lr, round_lg, round_lb, round_hr, round_hg, round_hb);
+
+                               int orig_round_lr = round_lr, orig_round_lg = round_lg, orig_round_lb = round_lb, orig_round_hr = round_hr, orig_round_hg = round_hg, orig_round_hb = round_hb;
+
+                               uint32_t round_err = bc1_find_sels4(flags, pSrc_pixels, round_lr, round_lg, round_lb, round_hr, round_hg, round_hb, round_sels, UINT32_MAX);
+                                               
+                               const uint32_t total_ls_passes = flags & cEncodeBC1TwoLeastSquaresPasses ? 2 : 1;
+                               for (uint32_t ls_pass = 0; ls_pass < total_ls_passes; ls_pass++)
+                               {
+                                       int trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb;
+
+                                       vec3F xl, xh;
+                                       if (!compute_least_squares_endpoints4_rgb(pSrc_pixels, round_sels, &xl, &xh, total_r, total_g, total_b))
+                                       {
+                                               // All selectors equal - treat it as a solid block which should always be equal or better.
+                                               trial_lr = g_bc1_match5_equals_1[avg_r].m_hi;
+                                               trial_lg = g_bc1_match6_equals_1[avg_g].m_hi;
+                                               trial_lb = g_bc1_match5_equals_1[avg_b].m_hi;
+
+                                               trial_hr = g_bc1_match5_equals_1[avg_r].m_lo;
+                                               trial_hg = g_bc1_match6_equals_1[avg_g].m_lo;
+                                               trial_hb = g_bc1_match5_equals_1[avg_b].m_lo;
+
+                                               // In high/higher quality mode, let it try again in case the optimal tables have caused the sels to diverge.
+                                       }
+                                       else
+                                       {
+                                               precise_round_565(xl, xh, trial_hr, trial_hg, trial_hb, trial_lr, trial_lg, trial_lb);
+                                       }
+
+                                       if ((round_lr == trial_lr) && (round_lg == trial_lg) && (round_lb == trial_lb) && (round_hr == trial_hr) && (round_hg == trial_hg) && (round_hb == trial_hb))
+                                               break;
+                       
+                                       uint8_t trial_sels[16];
+                                       uint32_t trial_err = bc1_find_sels4(flags, pSrc_pixels, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb, trial_sels, round_err);
+                                                                                                               
+                                       if (trial_err < round_err)
+                                       {
+                                               round_lr = trial_lr;
+                                               round_lg = trial_lg;
+                                               round_lb = trial_lb;
+
+                                               round_hr = trial_hr;
+                                               round_hg = trial_hg;
+                                               round_hb = trial_hb;
+
+                                               round_err = trial_err;
+                                               memcpy(round_sels, trial_sels, 16);
+                                       }
+                                       else
+                                               break;
+
+                               } // ls_pass
+
+                               if (round_err <= cur_err)
+                               {
+                                       cur_err = round_err;
+                               
+                                       lr = round_lr;
+                                       lg = round_lg;
+                                       lb = round_lb;
+                                       hr = round_hr;
+                                       hg = round_hg;
+                                       hb = round_hb;
+
+                                       orig_lr = orig_round_lr;
+                                       orig_lg = orig_round_lg;
+                                       orig_lb = orig_round_lb;
+                                       orig_hr = orig_round_hr;
+                                       orig_hg = orig_round_hg;
+                                       orig_hb = orig_round_hb;
+
+                                       memcpy(sels, round_sels, 16);
+                               }
+
+                       } // round
+               }
+                               
+               if ((cur_err) && (flags & cEncodeBC1UseLikelyTotalOrderings))
+               {
+                       assert(needs_block_error);
+
+                       const uint32_t total_iters = (flags & cEncodeBC1Iterative) ? 2 : 1;
+                       for (uint32_t iter_index = 0; iter_index < total_iters; iter_index++)
+                       {
+                               const uint32_t orig_err = cur_err;
+                                                               
+                               hist4 h;
+                               for (uint32_t i = 0; i < 16; i++)
+                               {
+                                       assert(sels[i] < 4);
+                                       h.m_hist[sels[i]]++;
+                               }
+
+                               const uint32_t orig_total_order_index = h.lookup_total_ordering_index();
+
+                               int r0, g0, b0, r3, g3, b3;
+                               r0 = (lr << 3) | (lr >> 2); g0 = (lg << 2) | (lg >> 4); b0 = (lb << 3) | (lb >> 2);
+                               r3 = (hr << 3) | (hr >> 2); g3 = (hg << 2) | (hg >> 4); b3 = (hb << 3) | (hb >> 2);
+                                                                               
+                               int ar = r3 - r0, ag = g3 - g0, ab = b3 - b0;
+                                                                                               
+                               int dots[16];
+                               for (uint32_t i = 0; i < 16; i++)
+                               {
+                                       int r = pSrc_pixels[i].r;
+                                       int g = pSrc_pixels[i].g;
+                                       int b = pSrc_pixels[i].b;
+                                       int d = 0x1000000 + (r * ar + g * ag + b * ab);
+                                       assert(d >= 0);
+                                       dots[i] = (d << 4) + i;
+                               }
+
+                               std::sort(dots, dots + 16);
+                                                               
+                               uint32_t r_sum[17], g_sum[17], b_sum[17];
+                               uint32_t r = 0, g = 0, b = 0;
+                               for (uint32_t i = 0; i < 16; i++)
+                               {
+                                       const uint32_t p = dots[i] & 15;
+
+                                       r_sum[i] = r;
+                                       g_sum[i] = g;
+                                       b_sum[i] = b;
+                                                                               
+                                       r += pSrc_pixels[p].r;
+                                       g += pSrc_pixels[p].g;
+                                       b += pSrc_pixels[p].b;
+                               }
+
+                               r_sum[16] = total_r;
+                               g_sum[16] = total_g;
+                               b_sum[16] = total_b;
+
+                               const uint32_t q_total = (flags & cEncodeBC1Exhaustive) ? NUM_UNIQUE_TOTAL_ORDERINGS4 : clampi(total_orderings_to_try, MIN_TOTAL_ORDERINGS, MAX_TOTAL_ORDERINGS4);
+                               for (uint32_t q = 0; q < q_total; q++)
+                               {
+                                       const uint32_t s = (flags & cEncodeBC1Exhaustive) ? q : g_best_total_orderings4[orig_total_order_index][q];
+       
+                                       int trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb;
+
+                                       vec3F xl, xh;
+
+                                       if ((s == TOTAL_ORDER_4_0_16) || (s == TOTAL_ORDER_4_1_16) || (s == TOTAL_ORDER_4_2_16) || (s == TOTAL_ORDER_4_3_16))
+                                       {
+                                               trial_lr = g_bc1_match5_equals_1[avg_r].m_hi;
+                                               trial_lg = g_bc1_match6_equals_1[avg_g].m_hi;
+                                               trial_lb = g_bc1_match5_equals_1[avg_b].m_hi;
+
+                                               trial_hr = g_bc1_match5_equals_1[avg_r].m_lo;
+                                               trial_hg = g_bc1_match6_equals_1[avg_g].m_lo;
+                                               trial_hb = g_bc1_match5_equals_1[avg_b].m_lo;
+                                       }
+                                       else
+                                       {
+                                               compute_least_squares_endpoints4_rgb(&xl, &xh, total_r, total_g, total_b, 
+                                                       g_selector_factors4[s][0], g_selector_factors4[s][1], g_selector_factors4[s][2], s, r_sum, g_sum, b_sum);
+                               
+                                               precise_round_565(xl, xh, trial_hr, trial_hg, trial_hb, trial_lr, trial_lg, trial_lb);
+                                       }
+                                                                               
+                                       uint8_t trial_sels[16];
+                                       
+                                       uint32_t trial_err = bc1_find_sels4(flags, pSrc_pixels, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb, trial_sels, cur_err);
+
+                                       if (trial_err < cur_err)
+                                       {
+                                               cur_err = trial_err;
+
+                                               lr = trial_lr;
+                                               lg = trial_lg;
+                                               lb = trial_lb;
+
+                                               hr = trial_hr;
+                                               hg = trial_hg;
+                                               hb = trial_hb;
+
+                                               memcpy(sels, trial_sels, 16);
+                                       }
+
+                               } // s
+
+                               if ((!cur_err) || (cur_err == orig_err))
+                                       break;
+                       
+                       } // iter_index
+               }
+                                                                                               
+               if ( ((flags & (cEncodeBC1Use3ColorBlocks | cEncodeBC1Use3ColorBlocksForBlackPixels)) != 0) && (cur_err) )
+               {
+                       if (flags & cEncodeBC1Use3ColorBlocks)
+                       {
+                               assert(needs_block_error);
+                               try_3color_block(pSrc_pixels, flags, cur_err, avg_r, avg_g, avg_b, orig_lr, orig_lg, orig_lb, orig_hr, orig_hg, orig_hb, total_r, total_g, total_b, total_orderings_to_try3, results);
+                       }
+
+                       if ((any_black_pixels) && ((flags & cEncodeBC1Use3ColorBlocksForBlackPixels) != 0))
+                       {
+                               assert(needs_block_error);
+                               try_3color_block_useblack(pSrc_pixels, flags, cur_err, results);
+                       }
+               }
+               
+               if ( (flags & cEncodeBC1EndpointSearchRoundsMask) && (cur_err)  )
+               {
+                       assert(needs_block_error);
+
+                       encode_bc1_endpoint_search(pSrc_pixels, any_black_pixels != 0, flags, results, cur_err);
+               }
+
+               if (results.m_3color)
+                       bc1_encode3(pDst_block, results.lr, results.lg, results.lb, results.hr, results.hg, results.hb, results.sels);
+               else
+                       bc1_encode4(pDst_block, results.lr, results.lg, results.lb, results.hr, results.hg, results.hb, results.sels);
+       }
+
+       // BC3-5
+
+       struct bc4_block
+       {
+               enum { cBC4SelectorBits = 3, cTotalSelectorBytes = 6, cMaxSelectorValues = 8 };
+               uint8_t m_endpoints[2];
+
+               uint8_t m_selectors[cTotalSelectorBytes];
+
+               inline uint32_t get_low_alpha() const { return m_endpoints[0]; }
+               inline uint32_t get_high_alpha() const { return m_endpoints[1]; }
+               inline bool is_alpha6_block() const { return get_low_alpha() <= get_high_alpha(); }
+
+               inline uint64_t get_selector_bits() const
+               {
+                       return ((uint64_t)((uint32_t)m_selectors[0] | ((uint32_t)m_selectors[1] << 8U) | ((uint32_t)m_selectors[2] << 16U) | ((uint32_t)m_selectors[3] << 24U))) |
+                               (((uint64_t)m_selectors[4]) << 32U) |
+                               (((uint64_t)m_selectors[5]) << 40U);
+               }
+
+               inline uint32_t get_selector(uint32_t x, uint32_t y, uint64_t selector_bits) const
+               {
+                       assert((x < 4U) && (y < 4U));
+                       return (selector_bits >> (((y * 4) + x) * cBC4SelectorBits))& (cMaxSelectorValues - 1);
+               }
+
+               static inline uint32_t get_block_values6(uint8_t* pDst, uint32_t l, uint32_t h)
+               {
+                       pDst[0] = static_cast<uint8_t>(l);
+                       pDst[1] = static_cast<uint8_t>(h);
+                       pDst[2] = static_cast<uint8_t>((l * 4 + h) / 5);
+                       pDst[3] = static_cast<uint8_t>((l * 3 + h * 2) / 5);
+                       pDst[4] = static_cast<uint8_t>((l * 2 + h * 3) / 5);
+                       pDst[5] = static_cast<uint8_t>((l + h * 4) / 5);
+                       pDst[6] = 0;
+                       pDst[7] = 255;
+                       return 6;
+               }
+
+               static inline uint32_t get_block_values8(uint8_t* pDst, uint32_t l, uint32_t h)
+               {
+                       pDst[0] = static_cast<uint8_t>(l);
+                       pDst[1] = static_cast<uint8_t>(h);
+                       pDst[2] = static_cast<uint8_t>((l * 6 + h) / 7);
+                       pDst[3] = static_cast<uint8_t>((l * 5 + h * 2) / 7);
+                       pDst[4] = static_cast<uint8_t>((l * 4 + h * 3) / 7);
+                       pDst[5] = static_cast<uint8_t>((l * 3 + h * 4) / 7);
+                       pDst[6] = static_cast<uint8_t>((l * 2 + h * 5) / 7);
+                       pDst[7] = static_cast<uint8_t>((l + h * 6) / 7);
+                       return 8;
+               }
+
+               static inline uint32_t get_block_values(uint8_t* pDst, uint32_t l, uint32_t h)
+               {
+                       if (l > h)
+                               return get_block_values8(pDst, l, h);
+                       else
+                               return get_block_values6(pDst, l, h);
+               }
+       };
+
+       void encode_bc4(void* pDst, const uint8_t* pPixels, uint32_t stride)
+       {
+               assert(g_initialized);
+
+               uint32_t min0_v, max0_v, min1_v, max1_v, min2_v, max2_v, min3_v, max3_v;
+
+               {
+                       min0_v = max0_v = pPixels[0 * stride];
+                       min1_v = max1_v = pPixels[1 * stride];
+                       min2_v = max2_v = pPixels[2 * stride];
+                       min3_v = max3_v = pPixels[3 * stride];
+               }
+
+               {
+                       uint32_t v0 = pPixels[4 * stride]; min0_v = std::min(min0_v, v0); max0_v = std::max(max0_v, v0);
+                       uint32_t v1 = pPixels[5 * stride]; min1_v = std::min(min1_v, v1); max1_v = std::max(max1_v, v1);
+                       uint32_t v2 = pPixels[6 * stride]; min2_v = std::min(min2_v, v2); max2_v = std::max(max2_v, v2);
+                       uint32_t v3 = pPixels[7 * stride]; min3_v = std::min(min3_v, v3); max3_v = std::max(max3_v, v3);
+               }
+
+               {
+                       uint32_t v0 = pPixels[8 * stride]; min0_v = std::min(min0_v, v0); max0_v = std::max(max0_v, v0);
+                       uint32_t v1 = pPixels[9 * stride]; min1_v = std::min(min1_v, v1); max1_v = std::max(max1_v, v1);
+                       uint32_t v2 = pPixels[10 * stride]; min2_v = std::min(min2_v, v2); max2_v = std::max(max2_v, v2);
+                       uint32_t v3 = pPixels[11 * stride]; min3_v = std::min(min3_v, v3); max3_v = std::max(max3_v, v3);
+               }
+
+               {
+                       uint32_t v0 = pPixels[12 * stride]; min0_v = std::min(min0_v, v0); max0_v = std::max(max0_v, v0);
+                       uint32_t v1 = pPixels[13 * stride]; min1_v = std::min(min1_v, v1); max1_v = std::max(max1_v, v1);
+                       uint32_t v2 = pPixels[14 * stride]; min2_v = std::min(min2_v, v2); max2_v = std::max(max2_v, v2);
+                       uint32_t v3 = pPixels[15 * stride]; min3_v = std::min(min3_v, v3); max3_v = std::max(max3_v, v3);
+               }
+
+               const uint32_t min_v = minimum(min0_v, min1_v, min2_v, min3_v);
+               const uint32_t max_v = maximum(max0_v, max1_v, max2_v, max3_v);
+
+               uint8_t* pDst_bytes = static_cast<uint8_t*>(pDst);
+               pDst_bytes[0] = (uint8_t)max_v;
+               pDst_bytes[1] = (uint8_t)min_v;
+
+               if (max_v == min_v)
+               {
+                       memset(pDst_bytes + 2, 0, 6);
+                       return;
+               }
+
+               const uint32_t delta = max_v - min_v;
+
+               // min_v is now 0. Compute thresholds between values by scaling max_v. It's x14 because we're adding two x7 scale factors.
+               const int t0 = delta * 13;
+               const int t1 = delta * 11;
+               const int t2 = delta * 9;
+               const int t3 = delta * 7;
+               const int t4 = delta * 5;
+               const int t5 = delta * 3;
+               const int t6 = delta * 1;
+
+               // BC4 floors in its divisions, which we compensate for with the 4 bias.
+               // This function is optimal for all possible inputs (i.e. it outputs the same results as checking all 8 values and choosing the closest one).
+               const int bias = 4 - min_v * 14;
+
+               static const uint32_t s_tran0[8] = { 1U      , 7U      , 6U      , 5U      , 4U      , 3U      , 2U      , 0U };
+               static const uint32_t s_tran1[8] = { 1U << 3U, 7U << 3U, 6U << 3U, 5U << 3U, 4U << 3U, 3U << 3U, 2U << 3U, 0U << 3U };
+               static const uint32_t s_tran2[8] = { 1U << 6U, 7U << 6U, 6U << 6U, 5U << 6U, 4U << 6U, 3U << 6U, 2U << 6U, 0U << 6U };
+               static const uint32_t s_tran3[8] = { 1U << 9U, 7U << 9U, 6U << 9U, 5U << 9U, 4U << 9U, 3U << 9U, 2U << 9U, 0U << 9U };
+
+               uint64_t a0, a1, a2, a3;
+               {
+                       const int v0 = pPixels[0 * stride] * 14 + bias;
+                       const int v1 = pPixels[1 * stride] * 14 + bias;
+                       const int v2 = pPixels[2 * stride] * 14 + bias;
+                       const int v3 = pPixels[3 * stride] * 14 + bias;
+                       a0 = s_tran0[(v0 >= t0) + (v0 >= t1) + (v0 >= t2) + (v0 >= t3) + (v0 >= t4) + (v0 >= t5) + (v0 >= t6)];
+                       a1 = s_tran1[(v1 >= t0) + (v1 >= t1) + (v1 >= t2) + (v1 >= t3) + (v1 >= t4) + (v1 >= t5) + (v1 >= t6)];
+                       a2 = s_tran2[(v2 >= t0) + (v2 >= t1) + (v2 >= t2) + (v2 >= t3) + (v2 >= t4) + (v2 >= t5) + (v2 >= t6)];
+                       a3 = s_tran3[(v3 >= t0) + (v3 >= t1) + (v3 >= t2) + (v3 >= t3) + (v3 >= t4) + (v3 >= t5) + (v3 >= t6)];
+               }
+
+               {
+                       const int v0 = pPixels[4 * stride] * 14 + bias;
+                       const int v1 = pPixels[5 * stride] * 14 + bias;
+                       const int v2 = pPixels[6 * stride] * 14 + bias;
+                       const int v3 = pPixels[7 * stride] * 14 + bias;
+                       a0 |= (uint64_t)(s_tran0[(v0 >= t0) + (v0 >= t1) + (v0 >= t2) + (v0 >= t3) + (v0 >= t4) + (v0 >= t5) + (v0 >= t6)] << 12U);
+                       a1 |= (uint64_t)(s_tran1[(v1 >= t0) + (v1 >= t1) + (v1 >= t2) + (v1 >= t3) + (v1 >= t4) + (v1 >= t5) + (v1 >= t6)] << 12U);
+                       a2 |= (uint64_t)(s_tran2[(v2 >= t0) + (v2 >= t1) + (v2 >= t2) + (v2 >= t3) + (v2 >= t4) + (v2 >= t5) + (v2 >= t6)] << 12U);
+                       a3 |= (uint64_t)(s_tran3[(v3 >= t0) + (v3 >= t1) + (v3 >= t2) + (v3 >= t3) + (v3 >= t4) + (v3 >= t5) + (v3 >= t6)] << 12U);
+               }
+
+               {
+                       const int v0 = pPixels[8 * stride] * 14 + bias;
+                       const int v1 = pPixels[9 * stride] * 14 + bias;
+                       const int v2 = pPixels[10 * stride] * 14 + bias;
+                       const int v3 = pPixels[11 * stride] * 14 + bias;
+                       a0 |= (((uint64_t)s_tran0[(v0 >= t0) + (v0 >= t1) + (v0 >= t2) + (v0 >= t3) + (v0 >= t4) + (v0 >= t5) + (v0 >= t6)]) << 24U);
+                       a1 |= (((uint64_t)s_tran1[(v1 >= t0) + (v1 >= t1) + (v1 >= t2) + (v1 >= t3) + (v1 >= t4) + (v1 >= t5) + (v1 >= t6)]) << 24U);
+                       a2 |= (((uint64_t)s_tran2[(v2 >= t0) + (v2 >= t1) + (v2 >= t2) + (v2 >= t3) + (v2 >= t4) + (v2 >= t5) + (v2 >= t6)]) << 24U);
+                       a3 |= (((uint64_t)s_tran3[(v3 >= t0) + (v3 >= t1) + (v3 >= t2) + (v3 >= t3) + (v3 >= t4) + (v3 >= t5) + (v3 >= t6)]) << 24U);
+               }
+
+               {
+                       const int v0 = pPixels[12 * stride] * 14 + bias;
+                       const int v1 = pPixels[13 * stride] * 14 + bias;
+                       const int v2 = pPixels[14 * stride] * 14 + bias;
+                       const int v3 = pPixels[15 * stride] * 14 + bias;
+                       a0 |= (((uint64_t)s_tran0[(v0 >= t0) + (v0 >= t1) + (v0 >= t2) + (v0 >= t3) + (v0 >= t4) + (v0 >= t5) + (v0 >= t6)]) << 36U);
+                       a1 |= (((uint64_t)s_tran1[(v1 >= t0) + (v1 >= t1) + (v1 >= t2) + (v1 >= t3) + (v1 >= t4) + (v1 >= t5) + (v1 >= t6)]) << 36U);
+                       a2 |= (((uint64_t)s_tran2[(v2 >= t0) + (v2 >= t1) + (v2 >= t2) + (v2 >= t3) + (v2 >= t4) + (v2 >= t5) + (v2 >= t6)]) << 36U);
+                       a3 |= (((uint64_t)s_tran3[(v3 >= t0) + (v3 >= t1) + (v3 >= t2) + (v3 >= t3) + (v3 >= t4) + (v3 >= t5) + (v3 >= t6)]) << 36U);
+               }
+
+               const uint64_t f = a0 | a1 | a2 | a3;
+
+               pDst_bytes[2] = (uint8_t)f;
+               pDst_bytes[3] = (uint8_t)(f >> 8U);
+               pDst_bytes[4] = (uint8_t)(f >> 16U);
+               pDst_bytes[5] = (uint8_t)(f >> 24U);
+               pDst_bytes[6] = (uint8_t)(f >> 32U);
+               pDst_bytes[7] = (uint8_t)(f >> 40U);
+       }
+
+       void encode_bc3(void* pDst, const uint8_t* pPixels, uint32_t flags, uint32_t total_orderings_to_try)
+       {
+               assert(g_initialized);
+
+               // 3-color blocks are not allowed with BC3 (on most GPU's).
+               flags &= ~(cEncodeBC1Use3ColorBlocksForBlackPixels | cEncodeBC1Use3ColorBlocks);
+
+               encode_bc4(pDst, pPixels + 3, 4);
+               encode_bc1(static_cast<uint8_t*>(pDst) + 8, pPixels, flags, total_orderings_to_try);
+       }
+
+       void encode_bc3(uint32_t level, void* pDst, const uint8_t* pPixels)
+       {
+               assert(g_initialized);
+
+               encode_bc4(pDst, pPixels + 3, 4);
+               encode_bc1(level, static_cast<uint8_t*>(pDst) + 8, pPixels, false, false);
+       }
+
+       void encode_bc5(void* pDst, const uint8_t* pPixels, uint32_t chan0, uint32_t chan1, uint32_t stride)
+       {
+               assert(g_initialized);
+
+               encode_bc4(pDst, pPixels + chan0, stride);
+               encode_bc4(static_cast<uint8_t*>(pDst) + 8, pPixels + chan1, stride);
+       }
+               
+       // Returns true if the block uses 3 color punchthrough alpha mode.
+       bool unpack_bc1(const void* pBlock_bits, void* pPixels, bool set_alpha, bc1_approx_mode mode)
+       {
+               color32* pDst_pixels = static_cast<color32*>(pPixels);
+
+               static_assert(sizeof(bc1_block) == 8, "sizeof(bc1_block) == 8");
+               static_assert(sizeof(bc4_block) == 8, "sizeof(bc4_block) == 8");
+
+               const bc1_block* pBlock = static_cast<const bc1_block*>(pBlock_bits);
+
+               const uint32_t l = pBlock->get_low_color();
+               const uint32_t h = pBlock->get_high_color();
+
+               color32 c[4];
+
+               const int cr0 = (l >> 11) & 31;
+               const int cg0 = (l >> 5) & 63;
+               const int cb0 = l & 31;
+               const int r0 = (cr0 << 3) | (cr0 >> 2);
+               const int g0 = (cg0 << 2) | (cg0 >> 4);
+               const int b0 = (cb0 << 3) | (cb0 >> 2);
+
+               const int cr1 = (h >> 11) & 31;
+               const int cg1 = (h >> 5) & 63;
+               const int cb1 = h & 31;
+               const int r1 = (cr1 << 3) | (cr1 >> 2);
+               const int g1 = (cg1 << 2) | (cg1 >> 4);
+               const int b1 = (cb1 << 3) | (cb1 >> 2);
+
+               bool used_punchthrough = false;
+                               
+               if (l > h)
+               {
+                       c[0].set_noclamp_rgba(r0, g0, b0, 255);
+                       c[1].set_noclamp_rgba(r1, g1, b1, 255);
+                       switch (mode)
+                       {
+                               case bc1_approx_mode::cBC1Ideal:
+                                       c[2].set_noclamp_rgba((r0 * 2 + r1) / 3, (g0 * 2 + g1) / 3, (b0 * 2 + b1) / 3, 255);
+                                       c[3].set_noclamp_rgba((r1 * 2 + r0) / 3, (g1 * 2 + g0) / 3, (b1 * 2 + b0) / 3, 255);
+                                       break;
+                               case bc1_approx_mode::cBC1IdealRound4:
+                                       c[2].set_noclamp_rgba((r0 * 2 + r1 + 1) / 3, (g0 * 2 + g1 + 1) / 3, (b0 * 2 + b1 + 1) / 3, 255);
+                                       c[3].set_noclamp_rgba((r1 * 2 + r0 + 1) / 3, (g1 * 2 + g0 + 1) / 3, (b1 * 2 + b0 + 1) / 3, 255);
+                                       break;
+                               case bc1_approx_mode::cBC1NVidia:
+                                       c[2].set_noclamp_rgba(interp_5_nv(cr0, cr1), interp_6_nv(g0, g1), interp_5_nv(cb0, cb1), 255);
+                                       c[3].set_noclamp_rgba(interp_5_nv(cr1, cr0), interp_6_nv(g1, g0), interp_5_nv(cb1, cb0), 255);
+                                       break;
+                               case bc1_approx_mode::cBC1AMD:
+                                       c[2].set_noclamp_rgba(interp_5_6_amd(r0, r1), interp_5_6_amd(g0, g1), interp_5_6_amd(b0, b1), 255);
+                                       c[3].set_noclamp_rgba(interp_5_6_amd(r1, r0), interp_5_6_amd(g1, g0), interp_5_6_amd(b1, b0), 255);
+                                       break;
+                       }
+               }
+               else
+               {
+                       c[0].set_noclamp_rgba(r0, g0, b0, 255);
+                       c[1].set_noclamp_rgba(r1, g1, b1, 255);
+                       switch (mode)
+                       {
+                               case bc1_approx_mode::cBC1Ideal:
+                               case bc1_approx_mode::cBC1IdealRound4:
+                                       c[2].set_noclamp_rgba((r0 + r1) / 2, (g0 + g1) / 2, (b0 + b1) / 2, 255);
+                                       break;
+                               case bc1_approx_mode::cBC1NVidia:
+                                       c[2].set_noclamp_rgba(interp_half_5_nv(cr0, cr1), interp_half_6_nv(g0, g1), interp_half_5_nv(cb0, cb1), 255);
+                                       break;
+                               case bc1_approx_mode::cBC1AMD:
+                                       c[2].set_noclamp_rgba(interp_half_5_6_amd(r0, r1), interp_half_5_6_amd(g0, g1), interp_half_5_6_amd(b0, b1), 255);
+                                       break;
+                       }
+
+                       c[3].set_noclamp_rgba(0, 0, 0, 0);
+                       used_punchthrough = true;
+               }
+
+               if (set_alpha)
+               {
+                       for (uint32_t y = 0; y < 4; y++, pDst_pixels += 4)
+                       {
+                               pDst_pixels[0] = c[pBlock->get_selector(0, y)];
+                               pDst_pixels[1] = c[pBlock->get_selector(1, y)];
+                               pDst_pixels[2] = c[pBlock->get_selector(2, y)];
+                               pDst_pixels[3] = c[pBlock->get_selector(3, y)];
+                       }
+               }
+               else
+               {
+                       for (uint32_t y = 0; y < 4; y++, pDst_pixels += 4)
+                       {
+                               pDst_pixels[0].set_rgb(c[pBlock->get_selector(0, y)]);
+                               pDst_pixels[1].set_rgb(c[pBlock->get_selector(1, y)]);
+                               pDst_pixels[2].set_rgb(c[pBlock->get_selector(2, y)]);
+                               pDst_pixels[3].set_rgb(c[pBlock->get_selector(3, y)]);
+                       }
+               }
+
+               return used_punchthrough;
+       }
+
+       void unpack_bc4(const void* pBlock_bits, uint8_t* pPixels, uint32_t stride)
+       {
+               static_assert(sizeof(bc4_block) == 8, "sizeof(bc4_block) == 8");
+
+               const bc4_block* pBlock = static_cast<const bc4_block*>(pBlock_bits);
+
+               uint8_t sel_values[8];
+               bc4_block::get_block_values(sel_values, pBlock->get_low_alpha(), pBlock->get_high_alpha());
+
+               const uint64_t selector_bits = pBlock->get_selector_bits();
+
+               for (uint32_t y = 0; y < 4; y++, pPixels += (stride * 4U))
+               {
+                       pPixels[0] = sel_values[pBlock->get_selector(0, y, selector_bits)];
+                       pPixels[stride * 1] = sel_values[pBlock->get_selector(1, y, selector_bits)];
+                       pPixels[stride * 2] = sel_values[pBlock->get_selector(2, y, selector_bits)];
+                       pPixels[stride * 3] = sel_values[pBlock->get_selector(3, y, selector_bits)];
+               }
+       }
+
+       // Returns false if the block uses 3-color punchthrough alpha mode, which isn't supported on some GPU's for BC3.
+       bool unpack_bc3(const void* pBlock_bits, void* pPixels, bc1_approx_mode mode)
+       {
+               color32* pDst_pixels = static_cast<color32*>(pPixels);
+
+               bool success = true;
+
+               if (unpack_bc1((const uint8_t*)pBlock_bits + sizeof(bc4_block), pDst_pixels, true, mode))
+                       success = false;
+
+               unpack_bc4(pBlock_bits, &pDst_pixels[0].a, sizeof(color32));
+
+               return success;
+       }
+
+       // writes RG
+       void unpack_bc5(const void* pBlock_bits, void* pPixels, uint32_t chan0, uint32_t chan1, uint32_t stride)
+       {
+               unpack_bc4(pBlock_bits, (uint8_t *)pPixels + chan0, stride);
+               unpack_bc4((const uint8_t*)pBlock_bits + sizeof(bc4_block), (uint8_t *)pPixels + chan1, stride);
+       }
+
+} // namespace rgbcx
+
+#endif //#ifdef RGBCX_IMPLEMENTATION
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright(c) 2020 Richard Geldreich, Jr.
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files(the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and / or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions :
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain(www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non - commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain.We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors.We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/
+

diff --git a/src/nbvtf/rgbcx_table4.h b/src/nbvtf/rgbcx_table4.h
new file mode 100644 (file)
index 0000000..cda3f0a
--- /dev/null
+++ b/src/nbvtf/rgbcx_table4.h
@@ -0,0 +1,969 @@
+{ 202,403,51,450,318,23,120,13,494,5,523,260,77,21,15,128,48,141,33,817,137,269,12,102,1,475,4,326,7,32,453,64,196,115,730,49,165,2,82,342,6,401,180,31,899,59,402,351,197,17,125,457,14,386,40,3,61,58,37,221,95,16,99,719,98,20,10,854,117,153,27,576,134,341,308,216,11,194,30,24,922,285,9,50,86,65,19,615,391,44,75,237,177,90,352,93,56,22,18,116,70,96,247,291,45,110,105,60,57,54,43,36,0,217,421,203,46,629,569,365,210,92,69,66,38,28,144,551  },
+{ 13,115,51,23,141,217,269,137,318,202,77,21,317,5,64,4,291,2,352,7,32,33,6,372,0,48,365,3,102,349,12,341,177,180,10,237,9,221,403,165,752,22,11,244,28,308,15,128,247,197,49,16,494,125,98,40,120,498,31,90,304,143,95,93,437,196,144,86,44,864,153,18,678,342,901,39,24,30,203,160,117,105,475,14,482,253,457,873,59,35,579,36,569,450,206,72,99,17,717,401,241,453,110,546,201,83,421,61,37,326,260,509,284,275,96,8,109,57,391,386,468,134,82,961,822,576,89,68  },
+{ 29,58,262,74,287,52,151,331,171,500,396,334,75,27,635,220,53,1,26,409,6,324,5,70,145,223,163,112,73,50,45,549,445,113,297,19,675,651,46,61,502,307,14,17,34,573,186,80,394,436,583,315,138,38,21,767,250,491,820,350,64,2,32,357,42,852,25,764,309,67,802,96,631,48,606,780,243,881,103,241,115,807,13,4,155,181,11,106,611,614,278,153,23,108,69,845,841,308,400,72,853,200,66,196,226,237,587,632,24,281,785,133,128,125,117,380,95,474,294,83,197,90,161,134,366,236,760,311  },
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+{ 13,23,51,115,77,177,202,4,141,32,40,33,217,64,128,90,269,102,59,318,11,291,0,137,403,22,21,7,165,197,15,210,247,180,16,117,153,352,14,2,125,494,10,49,237,18,95,453,6,9,1,24,28,349,475,216,12,342,317,304,3,196,86,98,275,134,31,17,35,25,365,308,19,341,44,36,372,30,93,20,401,76,241,402,139,752,57,244,105,386,37,26,260,110,288,120,116,48,326,421,221,285,901,38,99,82,498,39,468,55,523,143,111,482,65,300,214,450,203,457,351,43,29,27,8,576,678,569  },
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+{ 64,115,180,197,237,165,391,247,217,352,386,316,304,32,90,13,21,468,95,72,317,76,498,89,365,291,141,125,22,509,349,288,179,86,546,98,372,23,341,225,437,49,116,569,645,796,923,459,18,411,308,177,48,640,4,586,490,16,5,12,591,312,241,933,117,35,65,134,482,752,672,269,164,77,156,302,71,1,264,873,410,321,118,446,360,271,102,59,24,682,674,246,953,88,149,751,51,521,92,823,447,144,864,37,7,11,695,702,166,781,698,662,647,588,458,403,401,363,283,239,216,194,170,153,57,33,28,17  },
+{ 15,13,1,2,5,23,0,4,7,3,115,6,51,217,9,12,197,10,141,21,11,961,457,180,8,341,77,33,165,22,14,32,31,317,202,120,40,37,177,260,16,102,93,269,901,365,352,28,44,247,318,18,117,110,134,17,386,569,372,719,752,59,48,30,36,498,153,403,196,49,450,291,82,72,125,137,304,128,453,391,730,401,98,873,349,373,523,139,509,24,64,326,39,90,475,111,99,308,899,116,95,89,482,203,351,210,86,922,144,437,629,55,57,421,148,494,342,854,35,76,20,179,817,758,275,105,237,216  },
+{ 132,199,146,121,407,60,493,279,640,598,534,522,195,581,590,955,360,126,259,107,150,783,362,35,5,156,271,49,167,939,18,16,147,612,941,591,467,21,883,465,423,929,0,10,191,92,22,298,441,356,446,13,70,48,7,31,626,28,77,24,32,296,178,97,212,33,354,108,608,786,623,68,345,586,727,660,71,649,687,102,163,125,9,105,115,683,55,4,463,379,75,23,87,98,14,953,293,159,50,44,818,761,376,61,246,40,64,763,713,109,1,120,117,767,359,427,95,101,20,344,58,43,607,221,575,663,142,153  },
+{ 28,1,0,22,9,24,65,55,12,5,67,36,96,83,114,50,18,16,2,14,35,103,21,109,49,48,7,218,160,54,124,69,433,37,281,238,23,10,181,51,223,133,137,39,154,745,68,58,99,480,202,13,95,86,75,128,657,115,283,532,285,46,32,163,323,822,38,141,175,547,30,389,766,108,45,168,646,64,194,429,158,169,185,155,361,505,418,70,420,800,531,105,208,502,269,430,6,101,71,866,318,765,402,289,838,398,149,31,251,221,29,484,757,543,4,3,533,308,180,503,17,403,72,754,171,118,217,89  },
+{ 93,120,957,968,459,77,30,160,352,217,473,110,102,372,202,373,613,291,137,260,190,752,704,141,317,31,318,961,269,177,44,326,203,851,330,863,450,264,321,265,228,224,728,457,304,247,88,924,116,840,800,219,144,365,197,115,28,187,717,49,39,944,559,908,829,406,934,349,213,916,244,131,64,225,36,98,82,9,730,403,342,275,210,180,109,100,86,33,938,855,55,831,521,367,719,10,661,165,922,935,258,839,918,864,669,539,351,274,196,166,83,341,15,959,822,772,617,285,897,531,410,716,686,478,871,251,901,836  },
+{ 15,0,1,13,9,23,2,5,51,7,12,6,120,4,8,10,102,197,523,901,341,180,14,260,115,82,77,141,33,165,3,16,21,18,202,59,450,22,403,457,110,817,93,475,64,351,11,453,137,37,401,898,421,128,28,40,719,31,961,217,36,48,569,365,30,125,269,308,318,373,203,317,210,32,494,98,44,116,730,352,24,86,49,326,386,117,342,854,95,629,17,153,144,55,391,177,922,899,99,291,237,143,196,39,805,134,221,96,576,670,139,752,35,253,244,661,300,50,57,127,402,65,638,349,19,498,206,111  },
+{ 206,417,244,499,141,253,44,8,137,559,269,144,93,10,31,728,116,564,203,143,268,352,717,638,120,260,160,752,951,318,384,341,180,282,373,959,434,127,110,197,202,125,851,64,36,901,642,473,498,326,332,115,165,450,201,98,873,242,922,23,22,1,217,261,276,762,55,13,489,86,661,51,317,365,15,940,898,811,82,855,854,704,9,295,0,21,372,164,351,37,968,187,569,367,911,5,576,28,617,401,237,170,615,128,776,349,7,48,105,421,479,386,16,96,95,299,291,12,258,824,864,308,817,2,30,403,49,692  },
+{ 530,840,254,228,406,829,669,613,827,96,21,48,51,31,23,960,137,224,219,1,166,131,39,98,679,438,310,190,856,116,93,403,274,221,144,127,258,846,36,202,180,938,688,120,318,765,421,385,931,317,475,13,77,816,876,105,44,187,30,115,5,625,203,125,752,442,141,32,367,308,365,284,924,778,341,842,50,28,268,333,242,217,860,160,100,22,616,539,110,88,871,159,37,345,9,165,33,839,332,299,83,574,351,576,68,404,371,10,518,326,82,748,716,863,492,578,401,265,456,102,269,656,128,926,557,531,498,494  },
+{ 15,13,197,457,0,719,23,8,730,1,82,165,120,134,9,10,5,180,2,141,7,12,115,51,260,901,4,899,351,6,341,352,33,3,22,386,450,31,202,11,117,569,523,269,128,93,18,898,44,110,758,28,752,373,365,64,30,961,77,318,498,873,21,854,111,49,102,37,16,40,99,137,125,317,14,391,55,217,24,116,326,98,403,474,36,494,482,817,509,372,35,661,277,139,922,615,38,801,203,143,291,153,475,86,453,253,629,304,148,437,402,237,48,642,954,564,864,431,244,95,242,144,39,401,72,17,196,958  },
+{ 68,0,16,24,35,9,252,71,419,18,28,101,154,158,109,124,118,60,39,55,329,364,333,49,65,677,346,22,7,185,265,149,159,175,169,191,810,302,553,100,14,92,344,108,439,671,703,793,105,168,375,286,272,327,374,21,694,706,1,10,67,126,254,634,310,95,212,289,701,2,48,167,150,455,166,627,577,30,747,420,273,538,46,69,962,36,51,23,424,13,12,64,857,429,593,96,5,570,925,86,917,199,37,125,31,50,83,826,628,912,107,239,604,98,638,114,688,221,967,131,709,137,170,336,140,20,589,128  },
+{ 51,1,23,13,15,180,120,2,5,197,202,141,0,7,21,165,260,326,33,9,4,450,12,102,6,523,48,386,115,403,269,137,457,352,14,318,16,128,110,77,3,40,196,32,18,93,217,82,317,37,341,8,817,96,31,401,453,36,752,342,351,44,719,203,901,28,475,221,421,365,64,730,24,391,153,30,308,373,10,494,22,615,59,11,39,99,98,50,116,899,498,961,177,372,291,35,854,144,509,244,17,49,922,569,86,72,247,65,349,125,160,210,482,127,117,402,20,134,55,873,38,83,898,67,275,88,285,237  },
+{ 535,253,352,564,365,110,82,180,854,341,10,533,873,55,244,898,752,901,143,642,141,559,498,36,317,951,638,160,661,115,197,282,964,137,531,165,634,351,64,308,164,217,169,206,417,811,86,499,482,28,332,125,373,509,15,569,93,546,83,728,762,965,96,22,468,601,260,911,269,717,9,349,922,109,345,800,291,734,31,23,338,170,1,372,538,629,221,943,8,120,261,44,21,318,743,494,401,128,202,13,822,579,403,251,617,959,719,770,67,864,219,185,127,117,48,286,384,299,730,475,453,402,350,69,421,391,98,39  },
+{ 31,125,44,116,338,64,242,55,164,36,299,1,237,86,456,10,22,558,506,144,498,492,13,23,762,170,268,143,206,685,93,870,180,844,599,5,903,546,197,115,2,203,509,169,479,165,141,127,0,352,253,393,752,740,8,137,12,51,28,341,391,638,7,244,9,457,160,367,873,98,128,384,951,963,282,202,918,21,269,37,6,105,569,629,434,365,120,301,4,708,318,3,417,489,923,901,719,317,308,401,386,535,217,14,15,734,95,551,634,499,208,533,332,49,758,83,824,961,730,239,776,601,523,751,948,717,864,654  },
+{ 23,13,51,4,115,202,5,217,77,141,1,11,180,2,317,0,3,7,33,269,318,15,365,341,21,9,102,10,32,6,40,12,352,177,22,197,403,64,165,128,901,59,752,31,494,137,308,291,28,8,18,349,401,16,125,90,30,14,237,498,372,93,37,98,153,49,453,17,36,873,44,475,457,39,342,196,210,24,48,326,569,386,421,247,95,203,120,509,275,116,391,961,117,244,110,143,57,304,144,216,482,719,134,139,468,86,523,55,221,450,67,76,50,253,35,105,260,65,437,373,730,72,859,629,46,692,576,111  },
+{ 39,9,166,364,68,101,158,333,0,154,562,28,404,30,65,124,252,35,175,274,344,310,190,706,49,289,570,100,168,438,694,419,346,703,826,55,16,24,439,21,88,149,254,577,429,810,109,159,962,857,671,212,455,656,22,610,95,194,1,336,747,13,125,67,36,131,530,865,48,71,625,793,10,589,23,64,841,265,484,539,86,224,558,350,69,237,420,51,835,96,272,105,406,677,165,228,83,18,31,141,114,286,557,221,347,115,137,169,722,778,7,391,98,818,816,308,840,634,709,44,185,128,960,777,143,258,669,60  },
+{ 15,341,13,33,23,77,141,4,0,351,1,260,102,51,82,9,40,349,854,11,115,217,269,137,180,202,922,5,901,22,10,117,21,365,318,197,120,352,64,12,7,153,177,59,291,32,128,2,165,196,372,36,403,317,457,28,18,8,16,304,30,14,450,31,898,37,3,752,48,134,139,494,421,6,453,401,719,90,86,569,523,110,24,55,475,210,49,44,386,17,730,95,247,244,961,143,125,308,342,817,629,98,498,93,96,76,39,275,509,326,99,285,373,57,237,35,402,160,111,253,105,391,221,116,899,72,127,661  }

diff --git a/src/nbvtf/stb/stb_dxt.h b/src/nbvtf/stb/stb_dxt.h
new file mode 100644 (file)
index 0000000..04666de
--- /dev/null
+++ b/src/nbvtf/stb/stb_dxt.h
@@ -0,0 +1,753 @@
+// stb_dxt.h - v1.10 - DXT1/DXT5 compressor - public domain
+// original by fabian "ryg" giesen - ported to C by stb
+// use '#define STB_DXT_IMPLEMENTATION' before including to create the implementation
+//
+// USAGE:
+//   call stb_compress_dxt_block() for every block (you must pad)
+//     source should be a 4x4 block of RGBA data in row-major order;
+//     Alpha channel is not stored if you specify alpha=0 (but you
+//     must supply some constant alpha in the alpha channel).
+//     You can turn on dithering and "high quality" using mode.
+//
+// version history:
+//   v1.10  - (i.c) various small quality improvements
+//   v1.09  - (stb) update documentation re: surprising alpha channel requirement
+//   v1.08  - (stb) fix bug in dxt-with-alpha block
+//   v1.07  - (stb) bc4; allow not using libc; add STB_DXT_STATIC
+//   v1.06  - (stb) fix to known-broken 1.05
+//   v1.05  - (stb) support bc5/3dc (Arvids Kokins), use extern "C" in C++ (Pavel Krajcevski)
+//   v1.04  - (ryg) default to no rounding bias for lerped colors (as per S3TC/DX10 spec);
+//            single color match fix (allow for inexact color interpolation);
+//            optimal DXT5 index finder; "high quality" mode that runs multiple refinement steps.
+//   v1.03  - (stb) endianness support
+//   v1.02  - (stb) fix alpha encoding bug
+//   v1.01  - (stb) fix bug converting to RGB that messed up quality, thanks ryg & cbloom
+//   v1.00  - (stb) first release
+//
+// contributors:
+//   Rich Geldreich (more accurate index selection)
+//   Kevin Schmidt (#defines for "freestanding" compilation)
+//   github:ppiastucki (BC4 support)
+//   Ignacio Castano - improve DXT endpoint quantization
+//
+// LICENSE
+//
+//   See end of file for license information.
+
+#ifndef STB_INCLUDE_STB_DXT_H
+#define STB_INCLUDE_STB_DXT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef STB_DXT_STATIC
+#define STBDDEF static
+#else
+#define STBDDEF extern
+#endif
+
+// compression mode (bitflags)
+#define STB_DXT_NORMAL    0
+#define STB_DXT_DITHER    1   // use dithering. dubious win. never use for normal maps and the like!
+#define STB_DXT_HIGHQUAL  2   // high quality mode, does two refinement steps instead of 1. ~30-40% slower.
+
+STBDDEF void stb_compress_dxt_block(unsigned char *dest, const unsigned char *src_rgba_four_bytes_per_pixel, int alpha, int mode);
+STBDDEF void stb_compress_bc4_block(unsigned char *dest, const unsigned char *src_r_one_byte_per_pixel);
+STBDDEF void stb_compress_bc5_block(unsigned char *dest, const unsigned char *src_rg_two_byte_per_pixel);
+
+#define STB_COMPRESS_DXT_BLOCK
+
+#ifdef __cplusplus
+}
+#endif
+#endif // STB_INCLUDE_STB_DXT_H
+
+#ifdef STB_DXT_IMPLEMENTATION
+
+// configuration options for DXT encoder. set them in the project/makefile or just define
+// them at the top.
+
+// STB_DXT_USE_ROUNDING_BIAS
+//     use a rounding bias during color interpolation. this is closer to what "ideal"
+//     interpolation would do but doesn't match the S3TC/DX10 spec. old versions (pre-1.03)
+//     implicitly had this turned on.
+//
+//     in case you're targeting a specific type of hardware (e.g. console programmers):
+//     NVidia and Intel GPUs (as of 2010) as well as DX9 ref use DXT decoders that are closer
+//     to STB_DXT_USE_ROUNDING_BIAS. AMD/ATI, S3 and DX10 ref are closer to rounding with no bias.
+//     you also see "(a*5 + b*3) / 8" on some old GPU designs.
+// #define STB_DXT_USE_ROUNDING_BIAS
+
+#include <stdlib.h>
+
+#if !defined(STBD_ABS) || !defined(STBI_FABS)
+#include <math.h>
+#endif
+
+#ifndef STBD_ABS
+#define STBD_ABS(i)           abs(i)
+#endif
+
+#ifndef STBD_FABS
+#define STBD_FABS(x)          fabs(x)
+#endif
+
+#ifndef STBD_MEMSET
+#include <string.h>
+#define STBD_MEMSET           memset
+#endif
+
+static unsigned char stb__Expand5[32];
+static unsigned char stb__Expand6[64];
+static unsigned char stb__OMatch5[256][2];
+static unsigned char stb__OMatch6[256][2];
+static unsigned char stb__QuantRBTab[256+16];
+static unsigned char stb__QuantGTab[256+16];
+
+static int stb__Mul8Bit(int a, int b)
+{
+  int t = a*b + 128;
+  return (t + (t >> 8)) >> 8;
+}
+
+static void stb__From16Bit(unsigned char *out, unsigned short v)
+{
+   int rv = (v & 0xf800) >> 11;
+   int gv = (v & 0x07e0) >>  5;
+   int bv = (v & 0x001f) >>  0;
+
+   out[0] = stb__Expand5[rv];
+   out[1] = stb__Expand6[gv];
+   out[2] = stb__Expand5[bv];
+   out[3] = 0;
+}
+
+static unsigned short stb__As16Bit(int r, int g, int b)
+{
+   return (unsigned short)((stb__Mul8Bit(r,31) << 11) + (stb__Mul8Bit(g,63) << 5) + stb__Mul8Bit(b,31));
+}
+
+// linear interpolation at 1/3 point between a and b, using desired rounding type
+static int stb__Lerp13(int a, int b)
+{
+#ifdef STB_DXT_USE_ROUNDING_BIAS
+   // with rounding bias
+   return a + stb__Mul8Bit(b-a, 0x55);
+#else
+   // without rounding bias
+   // replace "/ 3" by "* 0xaaab) >> 17" if your compiler sucks or you really need every ounce of speed.
+   return (2*a + b) / 3;
+#endif
+}
+
+// lerp RGB color
+static void stb__Lerp13RGB(unsigned char *out, unsigned char *p1, unsigned char *p2)
+{
+   out[0] = (unsigned char)stb__Lerp13(p1[0], p2[0]);
+   out[1] = (unsigned char)stb__Lerp13(p1[1], p2[1]);
+   out[2] = (unsigned char)stb__Lerp13(p1[2], p2[2]);
+}
+
+/****************************************************************************/
+
+// compute table to reproduce constant colors as accurately as possible
+static void stb__PrepareOptTable(unsigned char *Table,const unsigned char *expand,int size)
+{
+   int i,mn,mx;
+   for (i=0;i<256;i++) {
+      int bestErr = 256;
+      for (mn=0;mn<size;mn++) {
+         for (mx=0;mx<size;mx++) {
+            int mine = expand[mn];
+            int maxe = expand[mx];
+            int err = STBD_ABS(stb__Lerp13(maxe, mine) - i);
+
+            // DX10 spec says that interpolation must be within 3% of "correct" result,
+            // add this as error term. (normally we'd expect a random distribution of
+            // +-1.5% error, but nowhere in the spec does it say that the error has to be
+            // unbiased - better safe than sorry).
+            err += STBD_ABS(maxe - mine) * 3 / 100;
+
+            if(err < bestErr)
+            {
+               Table[i*2+0] = (unsigned char)mx;
+               Table[i*2+1] = (unsigned char)mn;
+               bestErr = err;
+            }
+         }
+      }
+   }
+}
+
+static void stb__EvalColors(unsigned char *color,unsigned short c0,unsigned short c1)
+{
+   stb__From16Bit(color+ 0, c0);
+   stb__From16Bit(color+ 4, c1);
+   stb__Lerp13RGB(color+ 8, color+0, color+4);
+   stb__Lerp13RGB(color+12, color+4, color+0);
+}
+
+// Block dithering function. Simply dithers a block to 565 RGB.
+// (Floyd-Steinberg)
+static void stb__DitherBlock(unsigned char *dest, unsigned char *block)
+{
+  int err[8],*ep1 = err,*ep2 = err+4, *et;
+  int ch,y;
+
+  // process channels separately
+  for (ch=0; ch<3; ++ch) {
+      unsigned char *bp = block+ch, *dp = dest+ch;
+      unsigned char *quant = (ch == 1) ? stb__QuantGTab+8 : stb__QuantRBTab+8;
+      STBD_MEMSET(err, 0, sizeof(err));
+      for(y=0; y<4; ++y) {
+         dp[ 0] = quant[bp[ 0] + ((3*ep2[1] + 5*ep2[0]) >> 4)];
+         ep1[0] = bp[ 0] - dp[ 0];
+         dp[ 4] = quant[bp[ 4] + ((7*ep1[0] + 3*ep2[2] + 5*ep2[1] + ep2[0]) >> 4)];
+         ep1[1] = bp[ 4] - dp[ 4];
+         dp[ 8] = quant[bp[ 8] + ((7*ep1[1] + 3*ep2[3] + 5*ep2[2] + ep2[1]) >> 4)];
+         ep1[2] = bp[ 8] - dp[ 8];
+         dp[12] = quant[bp[12] + ((7*ep1[2] + 5*ep2[3] + ep2[2]) >> 4)];
+         ep1[3] = bp[12] - dp[12];
+         bp += 16;
+         dp += 16;
+         et = ep1, ep1 = ep2, ep2 = et; // swap
+      }
+   }
+}
+
+// The color matching function
+static unsigned int stb__MatchColorsBlock(unsigned char *block, unsigned char *color,int dither)
+{
+   unsigned int mask = 0;
+   int dirr = color[0*4+0] - color[1*4+0];
+   int dirg = color[0*4+1] - color[1*4+1];
+   int dirb = color[0*4+2] - color[1*4+2];
+   int dots[16];
+   int stops[4];
+   int i;
+   int c0Point, halfPoint, c3Point;
+
+   for(i=0;i<16;i++)
+      dots[i] = block[i*4+0]*dirr + block[i*4+1]*dirg + block[i*4+2]*dirb;
+
+   for(i=0;i<4;i++)
+      stops[i] = color[i*4+0]*dirr + color[i*4+1]*dirg + color[i*4+2]*dirb;
+
+   // think of the colors as arranged on a line; project point onto that line, then choose
+   // next color out of available ones. we compute the crossover points for "best color in top
+   // half"/"best in bottom half" and then the same inside that subinterval.
+   //
+   // relying on this 1d approximation isn't always optimal in terms of euclidean distance,
+   // but it's very close and a lot faster.
+   // http://cbloomrants.blogspot.com/2008/12/12-08-08-dxtc-summary.html
+
+   c0Point   = (stops[1] + stops[3]);
+   halfPoint = (stops[3] + stops[2]);
+   c3Point   = (stops[2] + stops[0]);
+
+   if(!dither) {
+      // the version without dithering is straightforward
+      for (i=15;i>=0;i--) {
+         int dot = dots[i]*2;
+         mask <<= 2;
+
+         if(dot < halfPoint)
+           mask |= (dot < c0Point) ? 1 : 3;
+         else
+           mask |= (dot < c3Point) ? 2 : 0;
+      }
+  } else {
+      // with floyd-steinberg dithering
+      int err[8],*ep1 = err,*ep2 = err+4;
+      int *dp = dots, y;
+
+      c0Point   <<= 3;
+      halfPoint <<= 3;
+      c3Point   <<= 3;
+      for(i=0;i<8;i++)
+         err[i] = 0;
+
+      for(y=0;y<4;y++)
+      {
+         int dot,lmask,step;
+
+         dot = (dp[0] << 4) + (3*ep2[1] + 5*ep2[0]);
+         if(dot < halfPoint)
+           step = (dot < c0Point) ? 1 : 3;
+         else
+           step = (dot < c3Point) ? 2 : 0;
+         ep1[0] = dp[0] - stops[step];
+         lmask = step;
+
+         dot = (dp[1] << 4) + (7*ep1[0] + 3*ep2[2] + 5*ep2[1] + ep2[0]);
+         if(dot < halfPoint)
+           step = (dot < c0Point) ? 1 : 3;
+         else
+           step = (dot < c3Point) ? 2 : 0;
+         ep1[1] = dp[1] - stops[step];
+         lmask |= step<<2;
+
+         dot = (dp[2] << 4) + (7*ep1[1] + 3*ep2[3] + 5*ep2[2] + ep2[1]);
+         if(dot < halfPoint)
+           step = (dot < c0Point) ? 1 : 3;
+         else
+           step = (dot < c3Point) ? 2 : 0;
+         ep1[2] = dp[2] - stops[step];
+         lmask |= step<<4;
+
+         dot = (dp[3] << 4) + (7*ep1[2] + 5*ep2[3] + ep2[2]);
+         if(dot < halfPoint)
+           step = (dot < c0Point) ? 1 : 3;
+         else
+           step = (dot < c3Point) ? 2 : 0;
+         ep1[3] = dp[3] - stops[step];
+         lmask |= step<<6;
+
+         dp += 4;
+         mask |= lmask << (y*8);
+         { int *et = ep1; ep1 = ep2; ep2 = et; } // swap
+      }
+   }
+
+   return mask;
+}
+
+// The color optimization function. (Clever code, part 1)
+static void stb__OptimizeColorsBlock(unsigned char *block, unsigned short *pmax16, unsigned short *pmin16)
+{
+  int mind = 0x7fffffff,maxd = -0x7fffffff;
+  unsigned char *minp, *maxp;
+  double magn;
+  int v_r,v_g,v_b;
+  static const int nIterPower = 4;
+  float covf[6],vfr,vfg,vfb;
+
+  // determine color distribution
+  int cov[6];
+  int mu[3],min[3],max[3];
+  int ch,i,iter;
+
+  for(ch=0;ch<3;ch++)
+  {
+    const unsigned char *bp = ((const unsigned char *) block) + ch;
+    int muv,minv,maxv;
+
+    muv = minv = maxv = bp[0];
+    for(i=4;i<64;i+=4)
+    {
+      muv += bp[i];
+      if (bp[i] < minv) minv = bp[i];
+      else if (bp[i] > maxv) maxv = bp[i];
+    }
+
+    mu[ch] = (muv + 8) >> 4;
+    min[ch] = minv;
+    max[ch] = maxv;
+  }
+
+  // determine covariance matrix
+  for (i=0;i<6;i++)
+     cov[i] = 0;
+
+  for (i=0;i<16;i++)
+  {
+    int r = block[i*4+0] - mu[0];
+    int g = block[i*4+1] - mu[1];
+    int b = block[i*4+2] - mu[2];
+
+    cov[0] += r*r;
+    cov[1] += r*g;
+    cov[2] += r*b;
+    cov[3] += g*g;
+    cov[4] += g*b;
+    cov[5] += b*b;
+  }
+
+  // convert covariance matrix to float, find principal axis via power iter
+  for(i=0;i<6;i++)
+    covf[i] = cov[i] / 255.0f;
+
+  vfr = (float) (max[0] - min[0]);
+  vfg = (float) (max[1] - min[1]);
+  vfb = (float) (max[2] - min[2]);
+
+  for(iter=0;iter<nIterPower;iter++)
+  {
+    float r = vfr*covf[0] + vfg*covf[1] + vfb*covf[2];
+    float g = vfr*covf[1] + vfg*covf[3] + vfb*covf[4];
+    float b = vfr*covf[2] + vfg*covf[4] + vfb*covf[5];
+
+    vfr = r;
+    vfg = g;
+    vfb = b;
+  }
+
+  magn = STBD_FABS(vfr);
+  if (STBD_FABS(vfg) > magn) magn = STBD_FABS(vfg);
+  if (STBD_FABS(vfb) > magn) magn = STBD_FABS(vfb);
+
+   if(magn < 4.0f) { // too small, default to luminance
+      v_r = 299; // JPEG YCbCr luma coefs, scaled by 1000.
+      v_g = 587;
+      v_b = 114;
+   } else {
+      magn = 512.0 / magn;
+      v_r = (int) (vfr * magn);
+      v_g = (int) (vfg * magn);
+      v_b = (int) (vfb * magn);
+   }
+
+   // Pick colors at extreme points
+   for(i=0;i<16;i++)
+   {
+      int dot = block[i*4+0]*v_r + block[i*4+1]*v_g + block[i*4+2]*v_b;
+
+      if (dot < mind) {
+         mind = dot;
+         minp = block+i*4;
+      }
+
+      if (dot > maxd) {
+         maxd = dot;
+         maxp = block+i*4;
+      }
+   }
+
+   *pmax16 = stb__As16Bit(maxp[0],maxp[1],maxp[2]);
+   *pmin16 = stb__As16Bit(minp[0],minp[1],minp[2]);
+}
+
+static const float midpoints5[32] = {
+   0.015686f, 0.047059f, 0.078431f, 0.111765f, 0.145098f, 0.176471f, 0.207843f, 0.241176f, 0.274510f, 0.305882f, 0.337255f, 0.370588f, 0.403922f, 0.435294f, 0.466667f, 0.5f,
+   0.533333f, 0.564706f, 0.596078f, 0.629412f, 0.662745f, 0.694118f, 0.725490f, 0.758824f, 0.792157f, 0.823529f, 0.854902f, 0.888235f, 0.921569f, 0.952941f, 0.984314f, 1.0f
+};
+
+static const float midpoints6[64] = {
+   0.007843f, 0.023529f, 0.039216f, 0.054902f, 0.070588f, 0.086275f, 0.101961f, 0.117647f, 0.133333f, 0.149020f, 0.164706f, 0.180392f, 0.196078f, 0.211765f, 0.227451f, 0.245098f,
+   0.262745f, 0.278431f, 0.294118f, 0.309804f, 0.325490f, 0.341176f, 0.356863f, 0.372549f, 0.388235f, 0.403922f, 0.419608f, 0.435294f, 0.450980f, 0.466667f, 0.482353f, 0.500000f,
+   0.517647f, 0.533333f, 0.549020f, 0.564706f, 0.580392f, 0.596078f, 0.611765f, 0.627451f, 0.643137f, 0.658824f, 0.674510f, 0.690196f, 0.705882f, 0.721569f, 0.737255f, 0.754902f,
+   0.772549f, 0.788235f, 0.803922f, 0.819608f, 0.835294f, 0.850980f, 0.866667f, 0.882353f, 0.898039f, 0.913725f, 0.929412f, 0.945098f, 0.960784f, 0.976471f, 0.992157f, 1.0f
+};
+
+static unsigned short stb__Quantize5(float x)
+{
+   unsigned short q;
+   x = x < 0 ? 0 : x > 1 ? 1 : x;  // saturate
+   q = (unsigned short)(x * 31);
+   q += (x > midpoints5[q]);
+   return q;
+}
+
+static unsigned short stb__Quantize6(float x)
+{
+   unsigned short q;
+   x = x < 0 ? 0 : x > 1 ? 1 : x;  // saturate
+   q = (unsigned short)(x * 63);
+   q += (x > midpoints6[q]);
+   return q;
+}
+
+// The refinement function. (Clever code, part 2)
+// Tries to optimize colors to suit block contents better.
+// (By solving a least squares system via normal equations+Cramer's rule)
+static int stb__RefineBlock(unsigned char *block, unsigned short *pmax16, unsigned short *pmin16, unsigned int mask)
+{
+   static const int w1Tab[4] = { 3,0,2,1 };
+   static const int prods[4] = { 0x090000,0x000900,0x040102,0x010402 };
+   // ^some magic to save a lot of multiplies in the accumulating loop...
+   // (precomputed products of weights for least squares system, accumulated inside one 32-bit register)
+
+   float f;
+   unsigned short oldMin, oldMax, min16, max16;
+   int i, akku = 0, xx,xy,yy;
+   int At1_r,At1_g,At1_b;
+   int At2_r,At2_g,At2_b;
+   unsigned int cm = mask;
+
+   oldMin = *pmin16;
+   oldMax = *pmax16;
+
+   if((mask ^ (mask<<2)) < 4) // all pixels have the same index?
+   {
+      // yes, linear system would be singular; solve using optimal
+      // single-color match on average color
+      int r = 8, g = 8, b = 8;
+      for (i=0;i<16;++i) {
+         r += block[i*4+0];
+         g += block[i*4+1];
+         b += block[i*4+2];
+      }
+
+      r >>= 4; g >>= 4; b >>= 4;
+
+      max16 = (stb__OMatch5[r][0]<<11) | (stb__OMatch6[g][0]<<5) | stb__OMatch5[b][0];
+      min16 = (stb__OMatch5[r][1]<<11) | (stb__OMatch6[g][1]<<5) | stb__OMatch5[b][1];
+   } else {
+      At1_r = At1_g = At1_b = 0;
+      At2_r = At2_g = At2_b = 0;
+      for (i=0;i<16;++i,cm>>=2) {
+         int step = cm&3;
+         int w1 = w1Tab[step];
+         int r = block[i*4+0];
+         int g = block[i*4+1];
+         int b = block[i*4+2];
+
+         akku    += prods[step];
+         At1_r   += w1*r;
+         At1_g   += w1*g;
+         At1_b   += w1*b;
+         At2_r   += r;
+         At2_g   += g;
+         At2_b   += b;
+      }
+
+      At2_r = 3*At2_r - At1_r;
+      At2_g = 3*At2_g - At1_g;
+      At2_b = 3*At2_b - At1_b;
+
+      // extract solutions and decide solvability
+      xx = akku >> 16;
+      yy = (akku >> 8) & 0xff;
+      xy = (akku >> 0) & 0xff;
+
+      f = 3.0f / 255.0f / (xx*yy - xy*xy);
+
+      max16 =  stb__Quantize5((At1_r*yy - At2_r * xy) * f) << 11;
+      max16 |= stb__Quantize6((At1_g*yy - At2_g * xy) * f) << 5;
+      max16 |= stb__Quantize5((At1_b*yy - At2_b * xy) * f) << 0;
+
+      min16 =  stb__Quantize5((At2_r*xx - At1_r * xy) * f) << 11;
+      min16 |= stb__Quantize6((At2_g*xx - At1_g * xy) * f) << 5;
+      min16 |= stb__Quantize5((At2_b*xx - At1_b * xy) * f) << 0;
+   }
+
+   *pmin16 = min16;
+   *pmax16 = max16;
+   return oldMin != min16 || oldMax != max16;
+}
+
+// Color block compression
+static void stb__CompressColorBlock(unsigned char *dest, unsigned char *block, int mode)
+{
+   unsigned int mask;
+   int i;
+   int dither;
+   int refinecount;
+   unsigned short max16, min16;
+   unsigned char dblock[16*4],color[4*4];
+
+   dither = mode & STB_DXT_DITHER;
+   refinecount = (mode & STB_DXT_HIGHQUAL) ? 2 : 1;
+
+   // check if block is constant
+   for (i=1;i<16;i++)
+      if (((unsigned int *) block)[i] != ((unsigned int *) block)[0])
+         break;
+
+   if(i == 16) { // constant color
+      int r = block[0], g = block[1], b = block[2];
+      mask  = 0xaaaaaaaa;
+      max16 = (stb__OMatch5[r][0]<<11) | (stb__OMatch6[g][0]<<5) | stb__OMatch5[b][0];
+      min16 = (stb__OMatch5[r][1]<<11) | (stb__OMatch6[g][1]<<5) | stb__OMatch5[b][1];
+   } else {
+      // first step: compute dithered version for PCA if desired
+      if(dither)
+         stb__DitherBlock(dblock,block);
+
+      // second step: pca+map along principal axis
+      stb__OptimizeColorsBlock(dither ? dblock : block,&max16,&min16);
+      if (max16 != min16) {
+         stb__EvalColors(color,max16,min16);
+         mask = stb__MatchColorsBlock(block,color,dither);
+      } else
+         mask = 0;
+
+      // third step: refine (multiple times if requested)
+      for (i=0;i<refinecount;i++) {
+         unsigned int lastmask = mask;
+
+         if (stb__RefineBlock(dither ? dblock : block,&max16,&min16,mask)) {
+            if (max16 != min16) {
+               stb__EvalColors(color,max16,min16);
+               mask = stb__MatchColorsBlock(block,color,dither);
+            } else {
+               mask = 0;
+               break;
+            }
+         }
+
+         if(mask == lastmask)
+            break;
+      }
+  }
+
+  // write the color block
+  if(max16 < min16)
+  {
+     unsigned short t = min16;
+     min16 = max16;
+     max16 = t;
+     mask ^= 0x55555555;
+  }
+
+  dest[0] = (unsigned char) (max16);
+  dest[1] = (unsigned char) (max16 >> 8);
+  dest[2] = (unsigned char) (min16);
+  dest[3] = (unsigned char) (min16 >> 8);
+  dest[4] = (unsigned char) (mask);
+  dest[5] = (unsigned char) (mask >> 8);
+  dest[6] = (unsigned char) (mask >> 16);
+  dest[7] = (unsigned char) (mask >> 24);
+}
+
+// Alpha block compression (this is easy for a change)
+static void stb__CompressAlphaBlock(unsigned char *dest,unsigned char *src, int stride)
+{
+   int i,dist,bias,dist4,dist2,bits,mask;
+
+   // find min/max color
+   int mn,mx;
+   mn = mx = src[0];
+
+   for (i=1;i<16;i++)
+   {
+      if (src[i*stride] < mn) mn = src[i*stride];
+      else if (src[i*stride] > mx) mx = src[i*stride];
+   }
+
+   // encode them
+   dest[0] = (unsigned char)mx;
+   dest[1] = (unsigned char)mn;
+   dest += 2;
+
+   // determine bias and emit color indices
+   // given the choice of mx/mn, these indices are optimal:
+   // http://fgiesen.wordpress.com/2009/12/15/dxt5-alpha-block-index-determination/
+   dist = mx-mn;
+   dist4 = dist*4;
+   dist2 = dist*2;
+   bias = (dist < 8) ? (dist - 1) : (dist/2 + 2);
+   bias -= mn * 7;
+   bits = 0,mask=0;
+
+   for (i=0;i<16;i++) {
+      int a = src[i*stride]*7 + bias;
+      int ind,t;
+
+      // select index. this is a "linear scale" lerp factor between 0 (val=min) and 7 (val=max).
+      t = (a >= dist4) ? -1 : 0; ind =  t & 4; a -= dist4 & t;
+      t = (a >= dist2) ? -1 : 0; ind += t & 2; a -= dist2 & t;
+      ind += (a >= dist);
+
+      // turn linear scale into DXT index (0/1 are extremal pts)
+      ind = -ind & 7;
+      ind ^= (2 > ind);
+
+      // write index
+      mask |= ind << bits;
+      if((bits += 3) >= 8) {
+         *dest++ = (unsigned char)mask;
+         mask >>= 8;
+         bits -= 8;
+      }
+   }
+}
+
+static void stb__InitDXT()
+{
+   int i;
+   for(i=0;i<32;i++)
+      stb__Expand5[i] = (unsigned char)((i<<3)|(i>>2));
+
+   for(i=0;i<64;i++)
+      stb__Expand6[i] = (unsigned char)((i<<2)|(i>>4));
+
+   for(i=0;i<256+16;i++)
+   {
+      int v = i-8 < 0 ? 0 : i-8 > 255 ? 255 : i-8;
+      stb__QuantRBTab[i] = stb__Expand5[stb__Mul8Bit(v,31)];
+      stb__QuantGTab[i] = stb__Expand6[stb__Mul8Bit(v,63)];
+   }
+
+   stb__PrepareOptTable(&stb__OMatch5[0][0],stb__Expand5,32);
+   stb__PrepareOptTable(&stb__OMatch6[0][0],stb__Expand6,64);
+}
+
+void stb_compress_dxt_block(unsigned char *dest, const unsigned char *src, int alpha, int mode)
+{
+   unsigned char data[16][4];
+   static int init=1;
+   if (init) {
+      stb__InitDXT();
+      init=0;
+   }
+
+   if (alpha) {
+      int i;
+      stb__CompressAlphaBlock(dest,(unsigned char*) src+3, 4);
+      dest += 8;
+      // make a new copy of the data in which alpha is opaque,
+      // because code uses a fast test for color constancy
+      memcpy(data, src, 4*16);
+      for (i=0; i < 16; ++i)
+         data[i][3] = 255;
+      src = &data[0][0];
+   }
+
+   stb__CompressColorBlock(dest,(unsigned char*) src,mode);
+}
+
+void stb_compress_bc4_block(unsigned char *dest, const unsigned char *src)
+{
+   stb__CompressAlphaBlock(dest,(unsigned char*) src, 1);
+}
+
+void stb_compress_bc5_block(unsigned char *dest, const unsigned char *src)
+{
+   stb__CompressAlphaBlock(dest,(unsigned char*) src,2);
+   stb__CompressAlphaBlock(dest + 8,(unsigned char*) src+1,2);
+}
+#endif // STB_DXT_IMPLEMENTATION
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/

diff --git a/src/nbvtf/stb/stb_image.h b/src/nbvtf/stb/stb_image.h
new file mode 100755 (executable)
index 0000000..201e479
--- /dev/null
+++ b/src/nbvtf/stb/stb_image.h
@@ -0,0 +1,7656 @@
+/* stb_image - v2.25 - public domain image loader - http://nothings.org/stb
+                                  no warranty implied; use at your own risk
+
+   Do this:
+      #define STB_IMAGE_IMPLEMENTATION
+   before you include this file in *one* C or C++ file to create the implementation.
+
+   // i.e. it should look like this:
+   #include ...
+   #include ...
+   #include ...
+   #define STB_IMAGE_IMPLEMENTATION
+   #include "stb_image.h"
+
+   You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
+   And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free
+
+
+   QUICK NOTES:
+      Primarily of interest to game developers and other people who can
+          avoid problematic images and only need the trivial interface
+
+      JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib)
+      PNG 1/2/4/8/16-bit-per-channel
+
+      TGA (not sure what subset, if a subset)
+      BMP non-1bpp, non-RLE
+      PSD (composited view only, no extra channels, 8/16 bit-per-channel)
+
+      GIF (*comp always reports as 4-channel)
+      HDR (radiance rgbE format)
+      PIC (Softimage PIC)
+      PNM (PPM and PGM binary only)
+
+      Animated GIF still needs a proper API, but here's one way to do it:
+          http://gist.github.com/urraka/685d9a6340b26b830d49
+
+      - decode from memory or through FILE (define STBI_NO_STDIO to remove code)
+      - decode from arbitrary I/O callbacks
+      - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON)
+
+   Full documentation under "DOCUMENTATION" below.
+
+
+LICENSE
+
+  See end of file for license information.
+
+RECENT REVISION HISTORY:
+
+      2.25  (2020-02-02) fix warnings
+      2.24  (2020-02-02) fix warnings; thread-local failure_reason and flip_vertically
+      2.23  (2019-08-11) fix clang static analysis warning
+      2.22  (2019-03-04) gif fixes, fix warnings
+      2.21  (2019-02-25) fix typo in comment
+      2.20  (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs
+      2.19  (2018-02-11) fix warning
+      2.18  (2018-01-30) fix warnings
+      2.17  (2018-01-29) bugfix, 1-bit BMP, 16-bitness query, fix warnings
+      2.16  (2017-07-23) all functions have 16-bit variants; optimizations; bugfixes
+      2.15  (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE detection on GCC
+      2.14  (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs
+      2.13  (2016-12-04) experimental 16-bit API, only for PNG so far; fixes
+      2.12  (2016-04-02) fix typo in 2.11 PSD fix that caused crashes
+      2.11  (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64
+                         RGB-format JPEG; remove white matting in PSD;
+                         allocate large structures on the stack;
+                         correct channel count for PNG & BMP
+      2.10  (2016-01-22) avoid warning introduced in 2.09
+      2.09  (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED
+
+   See end of file for full revision history.
+
+
+ ============================    Contributors    =========================
+
+ Image formats                          Extensions, features
+    Sean Barrett (jpeg, png, bmp)          Jetro Lauha (stbi_info)
+    Nicolas Schulz (hdr, psd)              Martin "SpartanJ" Golini (stbi_info)
+    Jonathan Dummer (tga)                  James "moose2000" Brown (iPhone PNG)
+    Jean-Marc Lienher (gif)                Ben "Disch" Wenger (io callbacks)
+    Tom Seddon (pic)                       Omar Cornut (1/2/4-bit PNG)
+    Thatcher Ulrich (psd)                  Nicolas Guillemot (vertical flip)
+    Ken Miller (pgm, ppm)                  Richard Mitton (16-bit PSD)
+    github:urraka (animated gif)           Junggon Kim (PNM comments)
+    Christopher Forseth (animated gif)     Daniel Gibson (16-bit TGA)
+                                           socks-the-fox (16-bit PNG)
+                                           Jeremy Sawicki (handle all ImageNet JPGs)
+ Optimizations & bugfixes                  Mikhail Morozov (1-bit BMP)
+    Fabian "ryg" Giesen                    Anael Seghezzi (is-16-bit query)
+    Arseny Kapoulkine
+    John-Mark Allen
+    Carmelo J Fdez-Aguera
+
+ Bug & warning fixes
+    Marc LeBlanc            David Woo          Guillaume George   Martins Mozeiko
+    Christpher Lloyd        Jerry Jansson      Joseph Thomson     Phil Jordan
+    Dave Moore              Roy Eltham         Hayaki Saito       Nathan Reed
+    Won Chun                Luke Graham        Johan Duparc       Nick Verigakis
+    the Horde3D community   Thomas Ruf         Ronny Chevalier    github:rlyeh
+    Janez Zemva             John Bartholomew   Michal Cichon      github:romigrou
+    Jonathan Blow           Ken Hamada         Tero Hanninen      github:svdijk
+    Laurent Gomila          Cort Stratton      Sergio Gonzalez    github:snagar
+    Aruelien Pocheville     Thibault Reuille   Cass Everitt       github:Zelex
+    Ryamond Barbiero        Paul Du Bois       Engin Manap        github:grim210
+    Aldo Culquicondor       Philipp Wiesemann  Dale Weiler        github:sammyhw
+    Oriol Ferrer Mesia      Josh Tobin         Matthew Gregan     github:phprus
+    Julian Raschke          Gregory Mullen     Baldur Karlsson    github:poppolopoppo
+    Christian Floisand      Kevin Schmidt      JR Smith           github:darealshinji
+    Brad Weinberger         Matvey Cherevko                       github:Michaelangel007
+    Blazej Dariusz Roszkowski                  Alexander Veselov
+*/
+
+#ifndef STBI_INCLUDE_STB_IMAGE_H
+#define STBI_INCLUDE_STB_IMAGE_H
+
+// DOCUMENTATION
+//
+// Limitations:
+//    - no 12-bit-per-channel JPEG
+//    - no JPEGs with arithmetic coding
+//    - GIF always returns *comp=4
+//
+// Basic usage (see HDR discussion below for HDR usage):
+//    int x,y,n;
+//    unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
+//    // ... process data if not NULL ...
+//    // ... x = width, y = height, n = # 8-bit components per pixel ...
+//    // ... replace '0' with '1'..'4' to force that many components per pixel
+//    // ... but 'n' will always be the number that it would have been if you said 0
+//    stbi_image_free(data)
+//
+// Standard parameters:
+//    int *x                 -- outputs image width in pixels
+//    int *y                 -- outputs image height in pixels
+//    int *channels_in_file  -- outputs # of image components in image file
+//    int desired_channels   -- if non-zero, # of image components requested in result
+//
+// The return value from an image loader is an 'unsigned char *' which points
+// to the pixel data, or NULL on an allocation failure or if the image is
+// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels,
+// with each pixel consisting of N interleaved 8-bit components; the first
+// pixel pointed to is top-left-most in the image. There is no padding between
+// image scanlines or between pixels, regardless of format. The number of
+// components N is 'desired_channels' if desired_channels is non-zero, or
+// *channels_in_file otherwise. If desired_channels is non-zero,
+// *channels_in_file has the number of components that _would_ have been
+// output otherwise. E.g. if you set desired_channels to 4, you will always
+// get RGBA output, but you can check *channels_in_file to see if it's trivially
+// opaque because e.g. there were only 3 channels in the source image.
+//
+// An output image with N components has the following components interleaved
+// in this order in each pixel:
+//
+//     N=#comp     components
+//       1           grey
+//       2           grey, alpha
+//       3           red, green, blue
+//       4           red, green, blue, alpha
+//
+// If image loading fails for any reason, the return value will be NULL,
+// and *x, *y, *channels_in_file will be unchanged. The function
+// stbi_failure_reason() can be queried for an extremely brief, end-user
+// unfriendly explanation of why the load failed. Define STBI_NO_FAILURE_STRINGS
+// to avoid compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
+// more user-friendly ones.
+//
+// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
+//
+// ===========================================================================
+//
+// UNICODE:
+//
+//   If compiling for Windows and you wish to use Unicode filenames, compile
+//   with
+//       #define STBI_WINDOWS_UTF8
+//   and pass utf8-encoded filenames. Call stbi_convert_wchar_to_utf8 to convert
+//   Windows wchar_t filenames to utf8.
+//
+// ===========================================================================
+//
+// Philosophy
+//
+// stb libraries are designed with the following priorities:
+//
+//    1. easy to use
+//    2. easy to maintain
+//    3. good performance
+//
+// Sometimes I let "good performance" creep up in priority over "easy to maintain",
+// and for best performance I may provide less-easy-to-use APIs that give higher
+// performance, in addition to the easy-to-use ones. Nevertheless, it's important
+// to keep in mind that from the standpoint of you, a client of this library,
+// all you care about is #1 and #3, and stb libraries DO NOT emphasize #3 above all.
+//
+// Some secondary priorities arise directly from the first two, some of which
+// provide more explicit reasons why performance can't be emphasized.
+//
+//    - Portable ("ease of use")
+//    - Small source code footprint ("easy to maintain")
+//    - No dependencies ("ease of use")
+//
+// ===========================================================================
+//
+// I/O callbacks
+//
+// I/O callbacks allow you to read from arbitrary sources, like packaged
+// files or some other source. Data read from callbacks are processed
+// through a small internal buffer (currently 128 bytes) to try to reduce
+// overhead.
+//
+// The three functions you must define are "read" (reads some bytes of data),
+// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end).
+//
+// ===========================================================================
+//
+// SIMD support
+//
+// The JPEG decoder will try to automatically use SIMD kernels on x86 when
+// supported by the compiler. For ARM Neon support, you must explicitly
+// request it.
+//
+// (The old do-it-yourself SIMD API is no longer supported in the current
+// code.)
+//
+// On x86, SSE2 will automatically be used when available based on a run-time
+// test; if not, the generic C versions are used as a fall-back. On ARM targets,
+// the typical path is to have separate builds for NEON and non-NEON devices
+// (at least this is true for iOS and Android). Therefore, the NEON support is
+// toggled by a build flag: define STBI_NEON to get NEON loops.
+//
+// If for some reason you do not want to use any of SIMD code, or if
+// you have issues compiling it, you can disable it entirely by
+// defining STBI_NO_SIMD.
+//
+// ===========================================================================
+//
+// HDR image support   (disable by defining STBI_NO_HDR)
+//
+// stb_image supports loading HDR images in general, and currently the Radiance
+// .HDR file format specifically. You can still load any file through the existing
+// interface; if you attempt to load an HDR file, it will be automatically remapped
+// to LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1;
+// both of these constants can be reconfigured through this interface:
+//
+//     stbi_hdr_to_ldr_gamma(2.2f);
+//     stbi_hdr_to_ldr_scale(1.0f);
+//
+// (note, do not use _inverse_ constants; stbi_image will invert them
+// appropriately).
+//
+// Additionally, there is a new, parallel interface for loading files as
+// (linear) floats to preserve the full dynamic range:
+//
+//    float *data = stbi_loadf(filename, &x, &y, &n, 0);
+//
+// If you load LDR images through this interface, those images will
+// be promoted to floating point values, run through the inverse of
+// constants corresponding to the above:
+//
+//     stbi_ldr_to_hdr_scale(1.0f);
+//     stbi_ldr_to_hdr_gamma(2.2f);
+//
+// Finally, given a filename (or an open file or memory block--see header
+// file for details) containing image data, you can query for the "most
+// appropriate" interface to use (that is, whether the image is HDR or
+// not), using:
+//
+//     stbi_is_hdr(char *filename);
+//
+// ===========================================================================
+//
+// iPhone PNG support:
+//
+// By default we convert iphone-formatted PNGs back to RGB, even though
+// they are internally encoded differently. You can disable this conversion
+// by calling stbi_convert_iphone_png_to_rgb(0), in which case
+// you will always just get the native iphone "format" through (which
+// is BGR stored in RGB).
+//
+// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
+// pixel to remove any premultiplied alpha *only* if the image file explicitly
+// says there's premultiplied data (currently only happens in iPhone images,
+// and only if iPhone convert-to-rgb processing is on).
+//
+// ===========================================================================
+//
+// ADDITIONAL CONFIGURATION
+//
+//  - You can suppress implementation of any of the decoders to reduce
+//    your code footprint by #defining one or more of the following
+//    symbols before creating the implementation.
+//
+//        STBI_NO_JPEG
+//        STBI_NO_PNG
+//        STBI_NO_BMP
+//        STBI_NO_PSD
+//        STBI_NO_TGA
+//        STBI_NO_GIF
+//        STBI_NO_HDR
+//        STBI_NO_PIC
+//        STBI_NO_PNM   (.ppm and .pgm)
+//
+//  - You can request *only* certain decoders and suppress all other ones
+//    (this will be more forward-compatible, as addition of new decoders
+//    doesn't require you to disable them explicitly):
+//
+//        STBI_ONLY_JPEG
+//        STBI_ONLY_PNG
+//        STBI_ONLY_BMP
+//        STBI_ONLY_PSD
+//        STBI_ONLY_TGA
+//        STBI_ONLY_GIF
+//        STBI_ONLY_HDR
+//        STBI_ONLY_PIC
+//        STBI_ONLY_PNM   (.ppm and .pgm)
+//
+//   - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still
+//     want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB
+//
+
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif // STBI_NO_STDIO
+
+#define STBI_VERSION 1
+
+enum
+{
+   STBI_default = 0, // only used for desired_channels
+
+   STBI_grey       = 1,
+   STBI_grey_alpha = 2,
+   STBI_rgb        = 3,
+   STBI_rgb_alpha  = 4
+};
+
+#include <stdlib.h>
+typedef unsigned char stbi_uc;
+typedef unsigned short stbi_us;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef STBIDEF
+#ifdef STB_IMAGE_STATIC
+#define STBIDEF static
+#else
+#define STBIDEF extern
+#endif
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// PRIMARY API - works on images of any type
+//
+
+//
+// load image by filename, open file, or memory buffer
+//
+
+typedef struct
+{
+   int      (*read)  (void *user,char *data,int size);   // fill 'data' with 'size' bytes.  return number of bytes actually read
+   void     (*skip)  (void *user,int n);                 // skip the next 'n' bytes, or 'unget' the last -n bytes if negative
+   int      (*eof)   (void *user);                       // returns nonzero if we are at end of file/data
+} stbi_io_callbacks;
+
+////////////////////////////////////
+//
+// 8-bits-per-channel interface
+//
+
+STBIDEF stbi_uc *stbi_load_from_memory   (stbi_uc           const *buffer, int len   , int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk  , void *user, int *x, int *y, int *channels_in_file, int desired_channels);
+
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_uc *stbi_load            (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF stbi_uc *stbi_load_from_file  (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
+// for stbi_load_from_file, file pointer is left pointing immediately after image
+#endif
+
+#ifndef STBI_NO_GIF
+STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp);
+#endif
+
+#ifdef STBI_WINDOWS_UTF8
+STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input);
+#endif
+
+////////////////////////////////////
+//
+// 16-bits-per-channel interface
+//
+
+STBIDEF stbi_us *stbi_load_16_from_memory   (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels);
+
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_us *stbi_load_16          (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
+#endif
+
+////////////////////////////////////
+//
+// float-per-channel interface
+//
+#ifndef STBI_NO_LINEAR
+   STBIDEF float *stbi_loadf_from_memory     (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels);
+   STBIDEF float *stbi_loadf_from_callbacks  (stbi_io_callbacks const *clbk, void *user, int *x, int *y,  int *channels_in_file, int desired_channels);
+
+   #ifndef STBI_NO_STDIO
+   STBIDEF float *stbi_loadf            (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
+   STBIDEF float *stbi_loadf_from_file  (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
+   #endif
+#endif
+
+#ifndef STBI_NO_HDR
+   STBIDEF void   stbi_hdr_to_ldr_gamma(float gamma);
+   STBIDEF void   stbi_hdr_to_ldr_scale(float scale);
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_LINEAR
+   STBIDEF void   stbi_ldr_to_hdr_gamma(float gamma);
+   STBIDEF void   stbi_ldr_to_hdr_scale(float scale);
+#endif // STBI_NO_LINEAR
+
+// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR
+STBIDEF int    stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
+STBIDEF int    stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_is_hdr          (char const *filename);
+STBIDEF int      stbi_is_hdr_from_file(FILE *f);
+#endif // STBI_NO_STDIO
+
+
+// get a VERY brief reason for failure
+// on most compilers (and ALL modern mainstream compilers) this is threadsafe
+STBIDEF const char *stbi_failure_reason  (void);
+
+// free the loaded image -- this is just free()
+STBIDEF void     stbi_image_free      (void *retval_from_stbi_load);
+
+// get image dimensions & components without fully decoding
+STBIDEF int      stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
+STBIDEF int      stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
+STBIDEF int      stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len);
+STBIDEF int      stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *clbk, void *user);
+
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_info               (char const *filename,     int *x, int *y, int *comp);
+STBIDEF int      stbi_info_from_file     (FILE *f,                  int *x, int *y, int *comp);
+STBIDEF int      stbi_is_16_bit          (char const *filename);
+STBIDEF int      stbi_is_16_bit_from_file(FILE *f);
+#endif
+
+
+
+// for image formats that explicitly notate that they have premultiplied alpha,
+// we just return the colors as stored in the file. set this flag to force
+// unpremultiplication. results are undefined if the unpremultiply overflow.
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
+
+// indicate whether we should process iphone images back to canonical format,
+// or just pass them through "as-is"
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
+
+// flip the image vertically, so the first pixel in the output array is the bottom left
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
+
+// as above, but only applies to images loaded on the thread that calls the function
+// this function is only available if your compiler supports thread-local variables;
+// calling it will fail to link if your compiler doesn't
+STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip);
+
+// ZLIB client - used by PNG, available for other purposes
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header);
+STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int   stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+
+STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int   stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+//
+//
+////   end header file   /////////////////////////////////////////////////////
+#endif // STBI_INCLUDE_STB_IMAGE_H
+
+#ifdef STB_IMAGE_IMPLEMENTATION
+
+#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \
+  || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \
+  || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \
+  || defined(STBI_ONLY_ZLIB)
+   #ifndef STBI_ONLY_JPEG
+   #define STBI_NO_JPEG
+   #endif
+   #ifndef STBI_ONLY_PNG
+   #define STBI_NO_PNG
+   #endif
+   #ifndef STBI_ONLY_BMP
+   #define STBI_NO_BMP
+   #endif
+   #ifndef STBI_ONLY_PSD
+   #define STBI_NO_PSD
+   #endif
+   #ifndef STBI_ONLY_TGA
+   #define STBI_NO_TGA
+   #endif
+   #ifndef STBI_ONLY_GIF
+   #define STBI_NO_GIF
+   #endif
+   #ifndef STBI_ONLY_HDR
+   #define STBI_NO_HDR
+   #endif
+   #ifndef STBI_ONLY_PIC
+   #define STBI_NO_PIC
+   #endif
+   #ifndef STBI_ONLY_PNM
+   #define STBI_NO_PNM
+   #endif
+#endif
+
+#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB)
+#define STBI_NO_ZLIB
+#endif
+
+
+#include <stdarg.h>
+#include <stddef.h> // ptrdiff_t on osx
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+#include <math.h>  // ldexp, pow
+#endif
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif
+
+#ifndef STBI_ASSERT
+#include <assert.h>
+#define STBI_ASSERT(x) assert(x)
+#endif
+
+#ifdef __cplusplus
+#define STBI_EXTERN extern "C"
+#else
+#define STBI_EXTERN extern
+#endif
+
+
+#ifndef _MSC_VER
+   #ifdef __cplusplus
+   #define stbi_inline inline
+   #else
+   #define stbi_inline
+   #endif
+#else
+   #define stbi_inline __forceinline
+#endif
+
+#ifndef STBI_NO_THREAD_LOCALS
+   #if defined(__cplusplus) &&  __cplusplus >= 201103L
+      #define STBI_THREAD_LOCAL       thread_local
+   #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+      #define STBI_THREAD_LOCAL       _Thread_local
+   #elif defined(__GNUC__)
+      #define STBI_THREAD_LOCAL       __thread
+   #elif defined(_MSC_VER)
+      #define STBI_THREAD_LOCAL       __declspec(thread)
+#endif
+#endif
+
+#ifdef _MSC_VER
+typedef unsigned short stbi__uint16;
+typedef   signed short stbi__int16;
+typedef unsigned int   stbi__uint32;
+typedef   signed int   stbi__int32;
+#else
+#include <stdint.h>
+typedef uint16_t stbi__uint16;
+typedef int16_t  stbi__int16;
+typedef uint32_t stbi__uint32;
+typedef int32_t  stbi__int32;
+#endif
+
+// should produce compiler error if size is wrong
+typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
+
+#ifdef _MSC_VER
+#define STBI_NOTUSED(v)  (void)(v)
+#else
+#define STBI_NOTUSED(v)  (void)sizeof(v)
+#endif
+
+#ifdef _MSC_VER
+#define STBI_HAS_LROTL
+#endif
+
+#ifdef STBI_HAS_LROTL
+   #define stbi_lrot(x,y)  _lrotl(x,y)
+#else
+   #define stbi_lrot(x,y)  (((x) << (y)) | ((x) >> (32 - (y))))
+#endif
+
+#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED))
+// ok
+#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED)
+// ok
+#else
+#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)."
+#endif
+
+#ifndef STBI_MALLOC
+#define STBI_MALLOC(sz)           malloc(sz)
+#define STBI_REALLOC(p,newsz)     realloc(p,newsz)
+#define STBI_FREE(p)              free(p)
+#endif
+
+#ifndef STBI_REALLOC_SIZED
+#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz)
+#endif
+
+// x86/x64 detection
+#if defined(__x86_64__) || defined(_M_X64)
+#define STBI__X64_TARGET
+#elif defined(__i386) || defined(_M_IX86)
+#define STBI__X86_TARGET
+#endif
+
+#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD)
+// gcc doesn't support sse2 intrinsics unless you compile with -msse2,
+// which in turn means it gets to use SSE2 everywhere. This is unfortunate,
+// but previous attempts to provide the SSE2 functions with runtime
+// detection caused numerous issues. The way architecture extensions are
+// exposed in GCC/Clang is, sadly, not really suited for one-file libs.
+// New behavior: if compiled with -msse2, we use SSE2 without any
+// detection; if not, we don't use it at all.
+#define STBI_NO_SIMD
+#endif
+
+#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD)
+// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET
+//
+// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the
+// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant.
+// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not
+// simultaneously enabling "-mstackrealign".
+//
+// See https://github.com/nothings/stb/issues/81 for more information.
+//
+// So default to no SSE2 on 32-bit MinGW. If you've read this far and added
+// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2.
+#define STBI_NO_SIMD
+#endif
+
+#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET))
+#define STBI_SSE2
+#include <emmintrin.h>
+
+#ifdef _MSC_VER
+
+#if _MSC_VER >= 1400  // not VC6
+#include <intrin.h> // __cpuid
+static int stbi__cpuid3(void)
+{
+   int info[4];
+   __cpuid(info,1);
+   return info[3];
+}
+#else
+static int stbi__cpuid3(void)
+{
+   int res;
+   __asm {
+      mov  eax,1
+      cpuid
+      mov  res,edx
+   }
+   return res;
+}
+#endif
+
+#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name
+
+#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2)
+static int stbi__sse2_available(void)
+{
+   int info3 = stbi__cpuid3();
+   return ((info3 >> 26) & 1) != 0;
+}
+#endif
+
+#else // assume GCC-style if not VC++
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+
+#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2)
+static int stbi__sse2_available(void)
+{
+   // If we're even attempting to compile this on GCC/Clang, that means
+   // -msse2 is on, which means the compiler is allowed to use SSE2
+   // instructions at will, and so are we.
+   return 1;
+}
+#endif
+
+#endif
+#endif
+
+// ARM NEON
+#if defined(STBI_NO_SIMD) && defined(STBI_NEON)
+#undef STBI_NEON
+#endif
+
+#ifdef STBI_NEON
+#include <arm_neon.h>
+// assume GCC or Clang on ARM targets
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+#endif
+
+#ifndef STBI_SIMD_ALIGN
+#define STBI_SIMD_ALIGN(type, name) type name
+#endif
+
+///////////////////////////////////////////////
+//
+//  stbi__context struct and start_xxx functions
+
+// stbi__context structure is our basic context used by all images, so it
+// contains all the IO context, plus some basic image information
+typedef struct
+{
+   stbi__uint32 img_x, img_y;
+   int img_n, img_out_n;
+
+   stbi_io_callbacks io;
+   void *io_user_data;
+
+   int read_from_callbacks;
+   int buflen;
+   stbi_uc buffer_start[128];
+
+   stbi_uc *img_buffer, *img_buffer_end;
+   stbi_uc *img_buffer_original, *img_buffer_original_end;
+} stbi__context;
+
+
+static void stbi__refill_buffer(stbi__context *s);
+
+// initialize a memory-decode context
+static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len)
+{
+   s->io.read = NULL;
+   s->read_from_callbacks = 0;
+   s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer;
+   s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len;
+}
+
+// initialize a callback-based context
+static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user)
+{
+   s->io = *c;
+   s->io_user_data = user;
+   s->buflen = sizeof(s->buffer_start);
+   s->read_from_callbacks = 1;
+   s->img_buffer_original = s->buffer_start;
+   stbi__refill_buffer(s);
+   s->img_buffer_original_end = s->img_buffer_end;
+}
+
+#ifndef STBI_NO_STDIO
+
+static int stbi__stdio_read(void *user, char *data, int size)
+{
+   return (int) fread(data,1,size,(FILE*) user);
+}
+
+static void stbi__stdio_skip(void *user, int n)
+{
+   fseek((FILE*) user, n, SEEK_CUR);
+}
+
+static int stbi__stdio_eof(void *user)
+{
+   return feof((FILE*) user);
+}
+
+static stbi_io_callbacks stbi__stdio_callbacks =
+{
+   stbi__stdio_read,
+   stbi__stdio_skip,
+   stbi__stdio_eof,
+};
+
+static void stbi__start_file(stbi__context *s, FILE *f)
+{
+   stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f);
+}
+
+//static void stop_file(stbi__context *s) { }
+
+#endif // !STBI_NO_STDIO
+
+static void stbi__rewind(stbi__context *s)
+{
+   // conceptually rewind SHOULD rewind to the beginning of the stream,
+   // but we just rewind to the beginning of the initial buffer, because
+   // we only use it after doing 'test', which only ever looks at at most 92 bytes
+   s->img_buffer = s->img_buffer_original;
+   s->img_buffer_end = s->img_buffer_original_end;
+}
+
+enum
+{
+   STBI_ORDER_RGB,
+   STBI_ORDER_BGR
+};
+
+typedef struct
+{
+   int bits_per_channel;
+   int num_channels;
+   int channel_order;
+} stbi__result_info;
+
+#ifndef STBI_NO_JPEG
+static int      stbi__jpeg_test(stbi__context *s);
+static void    *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PNG
+static int      stbi__png_test(stbi__context *s);
+static void    *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__png_info(stbi__context *s, int *x, int *y, int *comp);
+static int      stbi__png_is16(stbi__context *s);
+#endif
+
+#ifndef STBI_NO_BMP
+static int      stbi__bmp_test(stbi__context *s);
+static void    *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_TGA
+static int      stbi__tga_test(stbi__context *s);
+static void    *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__tga_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PSD
+static int      stbi__psd_test(stbi__context *s);
+static void    *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc);
+static int      stbi__psd_info(stbi__context *s, int *x, int *y, int *comp);
+static int      stbi__psd_is16(stbi__context *s);
+#endif
+
+#ifndef STBI_NO_HDR
+static int      stbi__hdr_test(stbi__context *s);
+static float   *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PIC
+static int      stbi__pic_test(stbi__context *s);
+static void    *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__pic_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_GIF
+static int      stbi__gif_test(stbi__context *s);
+static void    *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static void    *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp);
+static int      stbi__gif_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PNM
+static int      stbi__pnm_test(stbi__context *s);
+static void    *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+static
+#ifdef STBI_THREAD_LOCAL
+STBI_THREAD_LOCAL
+#endif
+const char *stbi__g_failure_reason;
+
+STBIDEF const char *stbi_failure_reason(void)
+{
+   return stbi__g_failure_reason;
+}
+
+#ifndef STBI_NO_FAILURE_STRINGS
+static int stbi__err(const char *str)
+{
+   stbi__g_failure_reason = str;
+   return 0;
+}
+#endif
+
+static void *stbi__malloc(size_t size)
+{
+    return STBI_MALLOC(size);
+}
+
+// stb_image uses ints pervasively, including for offset calculations.
+// therefore the largest decoded image size we can support with the
+// current code, even on 64-bit targets, is INT_MAX. this is not a
+// significant limitation for the intended use case.
+//
+// we do, however, need to make sure our size calculations don't
+// overflow. hence a few helper functions for size calculations that
+// multiply integers together, making sure that they're non-negative
+// and no overflow occurs.
+
+// return 1 if the sum is valid, 0 on overflow.
+// negative terms are considered invalid.
+static int stbi__addsizes_valid(int a, int b)
+{
+   if (b < 0) return 0;
+   // now 0 <= b <= INT_MAX, hence also
+   // 0 <= INT_MAX - b <= INTMAX.
+   // And "a + b <= INT_MAX" (which might overflow) is the
+   // same as a <= INT_MAX - b (no overflow)
+   return a <= INT_MAX - b;
+}
+
+// returns 1 if the product is valid, 0 on overflow.
+// negative factors are considered invalid.
+static int stbi__mul2sizes_valid(int a, int b)
+{
+   if (a < 0 || b < 0) return 0;
+   if (b == 0) return 1; // mul-by-0 is always safe
+   // portable way to check for no overflows in a*b
+   return a <= INT_MAX/b;
+}
+
+#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR)
+// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow
+static int stbi__mad2sizes_valid(int a, int b, int add)
+{
+   return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a*b, add);
+}
+#endif
+
+// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow
+static int stbi__mad3sizes_valid(int a, int b, int c, int add)
+{
+   return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
+      stbi__addsizes_valid(a*b*c, add);
+}
+
+// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add)
+{
+   return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
+      stbi__mul2sizes_valid(a*b*c, d) && stbi__addsizes_valid(a*b*c*d, add);
+}
+#endif
+
+#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR)
+// mallocs with size overflow checking
+static void *stbi__malloc_mad2(int a, int b, int add)
+{
+   if (!stbi__mad2sizes_valid(a, b, add)) return NULL;
+   return stbi__malloc(a*b + add);
+}
+#endif
+
+static void *stbi__malloc_mad3(int a, int b, int c, int add)
+{
+   if (!stbi__mad3sizes_valid(a, b, c, add)) return NULL;
+   return stbi__malloc(a*b*c + add);
+}
+
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+static void *stbi__malloc_mad4(int a, int b, int c, int d, int add)
+{
+   if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL;
+   return stbi__malloc(a*b*c*d + add);
+}
+#endif
+
+// stbi__err - error
+// stbi__errpf - error returning pointer to float
+// stbi__errpuc - error returning pointer to unsigned char
+
+#ifdef STBI_NO_FAILURE_STRINGS
+   #define stbi__err(x,y)  0
+#elif defined(STBI_FAILURE_USERMSG)
+   #define stbi__err(x,y)  stbi__err(y)
+#else
+   #define stbi__err(x,y)  stbi__err(x)
+#endif
+
+#define stbi__errpf(x,y)   ((float *)(size_t) (stbi__err(x,y)?NULL:NULL))
+#define stbi__errpuc(x,y)  ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL))
+
+STBIDEF void stbi_image_free(void *retval_from_stbi_load)
+{
+   STBI_FREE(retval_from_stbi_load);
+}
+
+#ifndef STBI_NO_LINEAR
+static float   *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
+#endif
+
+#ifndef STBI_NO_HDR
+static stbi_uc *stbi__hdr_to_ldr(float   *data, int x, int y, int comp);
+#endif
+
+static int stbi__vertically_flip_on_load_global = 0;
+
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip)
+{
+   stbi__vertically_flip_on_load_global = flag_true_if_should_flip;
+}
+
+#ifndef STBI_THREAD_LOCAL
+#define stbi__vertically_flip_on_load  stbi__vertically_flip_on_load_global
+#else
+static STBI_THREAD_LOCAL int stbi__vertically_flip_on_load_local, stbi__vertically_flip_on_load_set;
+
+STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip)
+{
+   stbi__vertically_flip_on_load_local = flag_true_if_should_flip;
+   stbi__vertically_flip_on_load_set = 1;
+}
+
+#define stbi__vertically_flip_on_load  (stbi__vertically_flip_on_load_set       \
+                                         ? stbi__vertically_flip_on_load_local  \
+                                         : stbi__vertically_flip_on_load_global)
+#endif // STBI_THREAD_LOCAL
+
+static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc)
+{
+   memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields
+   ri->bits_per_channel = 8; // default is 8 so most paths don't have to be changed
+   ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here so we can add BGR order
+   ri->num_channels = 0;
+
+   #ifndef STBI_NO_JPEG
+   if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri);
+   #endif
+   #ifndef STBI_NO_PNG
+   if (stbi__png_test(s))  return stbi__png_load(s,x,y,comp,req_comp, ri);
+   #endif
+   #ifndef STBI_NO_BMP
+   if (stbi__bmp_test(s))  return stbi__bmp_load(s,x,y,comp,req_comp, ri);
+   #endif
+   #ifndef STBI_NO_GIF
+   if (stbi__gif_test(s))  return stbi__gif_load(s,x,y,comp,req_comp, ri);
+   #endif
+   #ifndef STBI_NO_PSD
+   if (stbi__psd_test(s))  return stbi__psd_load(s,x,y,comp,req_comp, ri, bpc);
+   #else
+   STBI_NOTUSED(bpc);
+   #endif
+   #ifndef STBI_NO_PIC
+   if (stbi__pic_test(s))  return stbi__pic_load(s,x,y,comp,req_comp, ri);
+   #endif
+   #ifndef STBI_NO_PNM
+   if (stbi__pnm_test(s))  return stbi__pnm_load(s,x,y,comp,req_comp, ri);
+   #endif
+
+   #ifndef STBI_NO_HDR
+   if (stbi__hdr_test(s)) {
+      float *hdr = stbi__hdr_load(s, x,y,comp,req_comp, ri);
+      return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
+   }
+   #endif
+
+   #ifndef STBI_NO_TGA
+   // test tga last because it's a crappy test!
+   if (stbi__tga_test(s))
+      return stbi__tga_load(s,x,y,comp,req_comp, ri);
+   #endif
+
+   return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
+}
+
+static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h, int channels)
+{
+   int i;
+   int img_len = w * h * channels;
+   stbi_uc *reduced;
+
+   reduced = (stbi_uc *) stbi__malloc(img_len);
+   if (reduced == NULL) return stbi__errpuc("outofmem", "Out of memory");
+
+   for (i = 0; i < img_len; ++i)
+      reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient approx of 16->8 bit scaling
+
+   STBI_FREE(orig);
+   return reduced;
+}
+
+static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h, int channels)
+{
+   int i;
+   int img_len = w * h * channels;
+   stbi__uint16 *enlarged;
+
+   enlarged = (stbi__uint16 *) stbi__malloc(img_len*2);
+   if (enlarged == NULL) return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory");
+
+   for (i = 0; i < img_len; ++i)
+      enlarged[i] = (stbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff
+
+   STBI_FREE(orig);
+   return enlarged;
+}
+
+static void stbi__vertical_flip(void *image, int w, int h, int bytes_per_pixel)
+{
+   int row;
+   size_t bytes_per_row = (size_t)w * bytes_per_pixel;
+   stbi_uc temp[2048];
+   stbi_uc *bytes = (stbi_uc *)image;
+
+   for (row = 0; row < (h>>1); row++) {
+      stbi_uc *row0 = bytes + row*bytes_per_row;
+      stbi_uc *row1 = bytes + (h - row - 1)*bytes_per_row;
+      // swap row0 with row1
+      size_t bytes_left = bytes_per_row;
+      while (bytes_left) {
+         size_t bytes_copy = (bytes_left < sizeof(temp)) ? bytes_left : sizeof(temp);
+         memcpy(temp, row0, bytes_copy);
+         memcpy(row0, row1, bytes_copy);
+         memcpy(row1, temp, bytes_copy);
+         row0 += bytes_copy;
+         row1 += bytes_copy;
+         bytes_left -= bytes_copy;
+      }
+   }
+}
+
+#ifndef STBI_NO_GIF
+static void stbi__vertical_flip_slices(void *image, int w, int h, int z, int bytes_per_pixel)
+{
+   int slice;
+   int slice_size = w * h * bytes_per_pixel;
+
+   stbi_uc *bytes = (stbi_uc *)image;
+   for (slice = 0; slice < z; ++slice) {
+      stbi__vertical_flip(bytes, w, h, bytes_per_pixel);
+      bytes += slice_size;
+   }
+}
+#endif
+
+static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__result_info ri;
+   void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8);
+
+   if (result == NULL)
+      return NULL;
+
+   if (ri.bits_per_channel != 8) {
+      STBI_ASSERT(ri.bits_per_channel == 16);
+      result = stbi__convert_16_to_8((stbi__uint16 *) result, *x, *y, req_comp == 0 ? *comp : req_comp);
+      ri.bits_per_channel = 8;
+   }
+
+   // @TODO: move stbi__convert_format to here
+
+   if (stbi__vertically_flip_on_load) {
+      int channels = req_comp ? req_comp : *comp;
+      stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi_uc));
+   }
+
+   return (unsigned char *) result;
+}
+
+static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__result_info ri;
+   void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16);
+
+   if (result == NULL)
+      return NULL;
+
+   if (ri.bits_per_channel != 16) {
+      STBI_ASSERT(ri.bits_per_channel == 8);
+      result = stbi__convert_8_to_16((stbi_uc *) result, *x, *y, req_comp == 0 ? *comp : req_comp);
+      ri.bits_per_channel = 16;
+   }
+
+   // @TODO: move stbi__convert_format16 to here
+   // @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to keep more precision
+
+   if (stbi__vertically_flip_on_load) {
+      int channels = req_comp ? req_comp : *comp;
+      stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi__uint16));
+   }
+
+   return (stbi__uint16 *) result;
+}
+
+#if !defined(STBI_NO_HDR) && !defined(STBI_NO_LINEAR)
+static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp)
+{
+   if (stbi__vertically_flip_on_load && result != NULL) {
+      int channels = req_comp ? req_comp : *comp;
+      stbi__vertical_flip(result, *x, *y, channels * sizeof(float));
+   }
+}
+#endif
+
+#ifndef STBI_NO_STDIO
+
+#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
+STBI_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide);
+STBI_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide, char *str, int cbmb, const char *defchar, int *used_default);
+#endif
+
+#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
+STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input)
+{
+       return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL);
+}
+#endif
+
+static FILE *stbi__fopen(char const *filename, char const *mode)
+{
+   FILE *f;
+#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
+   wchar_t wMode[64];
+   wchar_t wFilename[1024];
+       if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename)))
+      return 0;
+
+       if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode)))
+      return 0;
+
+#if _MSC_VER >= 1400
+       if (0 != _wfopen_s(&f, wFilename, wMode))
+               f = 0;
+#else
+   f = _wfopen(wFilename, wMode);
+#endif
+
+#elif defined(_MSC_VER) && _MSC_VER >= 1400
+   if (0 != fopen_s(&f, filename, mode))
+      f=0;
+#else
+   f = fopen(filename, mode);
+#endif
+   return f;
+}
+
+
+STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+   FILE *f = stbi__fopen(filename, "rb");
+   unsigned char *result;
+   if (!f) return stbi__errpuc("can't fopen", "Unable to open file");
+   result = stbi_load_from_file(f,x,y,comp,req_comp);
+   fclose(f);
+   return result;
+}
+
+STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+   unsigned char *result;
+   stbi__context s;
+   stbi__start_file(&s,f);
+   result = stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
+   if (result) {
+      // need to 'unget' all the characters in the IO buffer
+      fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
+   }
+   return result;
+}
+
+STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__uint16 *result;
+   stbi__context s;
+   stbi__start_file(&s,f);
+   result = stbi__load_and_postprocess_16bit(&s,x,y,comp,req_comp);
+   if (result) {
+      // need to 'unget' all the characters in the IO buffer
+      fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
+   }
+   return result;
+}
+
+STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+   FILE *f = stbi__fopen(filename, "rb");
+   stbi__uint16 *result;
+   if (!f) return (stbi_us *) stbi__errpuc("can't fopen", "Unable to open file");
+   result = stbi_load_from_file_16(f,x,y,comp,req_comp);
+   fclose(f);
+   return result;
+}
+
+
+#endif //!STBI_NO_STDIO
+
+STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels);
+}
+
+STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
+   return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels);
+}
+
+STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
+}
+
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+   return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
+}
+
+#ifndef STBI_NO_GIF
+STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp)
+{
+   unsigned char *result;
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+
+   result = (unsigned char*) stbi__load_gif_main(&s, delays, x, y, z, comp, req_comp);
+   if (stbi__vertically_flip_on_load) {
+      stbi__vertical_flip_slices( result, *x, *y, *z, *comp );
+   }
+
+   return result;
+}
+#endif
+
+#ifndef STBI_NO_LINEAR
+static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   unsigned char *data;
+   #ifndef STBI_NO_HDR
+   if (stbi__hdr_test(s)) {
+      stbi__result_info ri;
+      float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp, &ri);
+      if (hdr_data)
+         stbi__float_postprocess(hdr_data,x,y,comp,req_comp);
+      return hdr_data;
+   }
+   #endif
+   data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp);
+   if (data)
+      return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
+   return stbi__errpf("unknown image type", "Image not of any known type, or corrupt");
+}
+
+STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+
+STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+   return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+   float *result;
+   FILE *f = stbi__fopen(filename, "rb");
+   if (!f) return stbi__errpf("can't fopen", "Unable to open file");
+   result = stbi_loadf_from_file(f,x,y,comp,req_comp);
+   fclose(f);
+   return result;
+}
+
+STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_file(&s,f);
+   return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+#endif // !STBI_NO_STDIO
+
+#endif // !STBI_NO_LINEAR
+
+// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is
+// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always
+// reports false!
+
+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
+{
+   #ifndef STBI_NO_HDR
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__hdr_test(&s);
+   #else
+   STBI_NOTUSED(buffer);
+   STBI_NOTUSED(len);
+   return 0;
+   #endif
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_is_hdr          (char const *filename)
+{
+   FILE *f = stbi__fopen(filename, "rb");
+   int result=0;
+   if (f) {
+      result = stbi_is_hdr_from_file(f);
+      fclose(f);
+   }
+   return result;
+}
+
+STBIDEF int stbi_is_hdr_from_file(FILE *f)
+{
+   #ifndef STBI_NO_HDR
+   long pos = ftell(f);
+   int res;
+   stbi__context s;
+   stbi__start_file(&s,f);
+   res = stbi__hdr_test(&s);
+   fseek(f, pos, SEEK_SET);
+   return res;
+   #else
+   STBI_NOTUSED(f);
+   return 0;
+   #endif
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int      stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user)
+{
+   #ifndef STBI_NO_HDR
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+   return stbi__hdr_test(&s);
+   #else
+   STBI_NOTUSED(clbk);
+   STBI_NOTUSED(user);
+   return 0;
+   #endif
+}
+
+#ifndef STBI_NO_LINEAR
+static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f;
+
+STBIDEF void   stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; }
+STBIDEF void   stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; }
+#endif
+
+static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f;
+
+STBIDEF void   stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; }
+STBIDEF void   stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; }
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Common code used by all image loaders
+//
+
+enum
+{
+   STBI__SCAN_load=0,
+   STBI__SCAN_type,
+   STBI__SCAN_header
+};
+
+static void stbi__refill_buffer(stbi__context *s)
+{
+   int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen);
+   if (n == 0) {
+      // at end of file, treat same as if from memory, but need to handle case
+      // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file
+      s->read_from_callbacks = 0;
+      s->img_buffer = s->buffer_start;
+      s->img_buffer_end = s->buffer_start+1;
+      *s->img_buffer = 0;
+   } else {
+      s->img_buffer = s->buffer_start;
+      s->img_buffer_end = s->buffer_start + n;
+   }
+}
+
+stbi_inline static stbi_uc stbi__get8(stbi__context *s)
+{
+   if (s->img_buffer < s->img_buffer_end)
+      return *s->img_buffer++;
+   if (s->read_from_callbacks) {
+      stbi__refill_buffer(s);
+      return *s->img_buffer++;
+   }
+   return 0;
+}
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_HDR) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
+// nothing
+#else
+stbi_inline static int stbi__at_eof(stbi__context *s)
+{
+   if (s->io.read) {
+      if (!(s->io.eof)(s->io_user_data)) return 0;
+      // if feof() is true, check if buffer = end
+      // special case: we've only got the special 0 character at the end
+      if (s->read_from_callbacks == 0) return 1;
+   }
+
+   return s->img_buffer >= s->img_buffer_end;
+}
+#endif
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC)
+// nothing
+#else
+static void stbi__skip(stbi__context *s, int n)
+{
+   if (n < 0) {
+      s->img_buffer = s->img_buffer_end;
+      return;
+   }
+   if (s->io.read) {
+      int blen = (int) (s->img_buffer_end - s->img_buffer);
+      if (blen < n) {
+         s->img_buffer = s->img_buffer_end;
+         (s->io.skip)(s->io_user_data, n - blen);
+         return;
+      }
+   }
+   s->img_buffer += n;
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_TGA) && defined(STBI_NO_HDR) && defined(STBI_NO_PNM)
+// nothing
+#else
+static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n)
+{
+   if (s->io.read) {
+      int blen = (int) (s->img_buffer_end - s->img_buffer);
+      if (blen < n) {
+         int res, count;
+
+         memcpy(buffer, s->img_buffer, blen);
+
+         count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen);
+         res = (count == (n-blen));
+         s->img_buffer = s->img_buffer_end;
+         return res;
+      }
+   }
+
+   if (s->img_buffer+n <= s->img_buffer_end) {
+      memcpy(buffer, s->img_buffer, n);
+      s->img_buffer += n;
+      return 1;
+   } else
+      return 0;
+}
+#endif
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC)
+// nothing
+#else
+static int stbi__get16be(stbi__context *s)
+{
+   int z = stbi__get8(s);
+   return (z << 8) + stbi__get8(s);
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC)
+// nothing
+#else
+static stbi__uint32 stbi__get32be(stbi__context *s)
+{
+   stbi__uint32 z = stbi__get16be(s);
+   return (z << 16) + stbi__get16be(s);
+}
+#endif
+
+#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF)
+// nothing
+#else
+static int stbi__get16le(stbi__context *s)
+{
+   int z = stbi__get8(s);
+   return z + (stbi__get8(s) << 8);
+}
+#endif
+
+#ifndef STBI_NO_BMP
+static stbi__uint32 stbi__get32le(stbi__context *s)
+{
+   stbi__uint32 z = stbi__get16le(s);
+   return z + (stbi__get16le(s) << 16);
+}
+#endif
+
+#define STBI__BYTECAST(x)  ((stbi_uc) ((x) & 255))  // truncate int to byte without warnings
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
+// nothing
+#else
+//////////////////////////////////////////////////////////////////////////////
+//
+//  generic converter from built-in img_n to req_comp
+//    individual types do this automatically as much as possible (e.g. jpeg
+//    does all cases internally since it needs to colorspace convert anyway,
+//    and it never has alpha, so very few cases ). png can automatically
+//    interleave an alpha=255 channel, but falls back to this for other cases
+//
+//  assume data buffer is malloced, so malloc a new one and free that one
+//  only failure mode is malloc failing
+
+static stbi_uc stbi__compute_y(int r, int g, int b)
+{
+   return (stbi_uc) (((r*77) + (g*150) +  (29*b)) >> 8);
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
+// nothing
+#else
+static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y)
+{
+   int i,j;
+   unsigned char *good;
+
+   if (req_comp == img_n) return data;
+   STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+   good = (unsigned char *) stbi__malloc_mad3(req_comp, x, y, 0);
+   if (good == NULL) {
+      STBI_FREE(data);
+      return stbi__errpuc("outofmem", "Out of memory");
+   }
+
+   for (j=0; j < (int) y; ++j) {
+      unsigned char *src  = data + j * x * img_n   ;
+      unsigned char *dest = good + j * x * req_comp;
+
+      #define STBI__COMBO(a,b)  ((a)*8+(b))
+      #define STBI__CASE(a,b)   case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
+      // convert source image with img_n components to one with req_comp components;
+      // avoid switch per pixel, so use switch per scanline and massive macros
+      switch (STBI__COMBO(img_n, req_comp)) {
+         STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=255;                                     } break;
+         STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0];                                  } break;
+         STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=255;                     } break;
+         STBI__CASE(2,1) { dest[0]=src[0];                                                  } break;
+         STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0];                                  } break;
+         STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1];                  } break;
+         STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=255;        } break;
+         STBI__CASE(3,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]);                   } break;
+         STBI__CASE(3,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = 255;    } break;
+         STBI__CASE(4,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]);                   } break;
+         STBI__CASE(4,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = src[3]; } break;
+         STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];                    } break;
+         default: STBI_ASSERT(0);
+      }
+      #undef STBI__CASE
+   }
+
+   STBI_FREE(data);
+   return good;
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD)
+// nothing
+#else
+static stbi__uint16 stbi__compute_y_16(int r, int g, int b)
+{
+   return (stbi__uint16) (((r*77) + (g*150) +  (29*b)) >> 8);
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD)
+// nothing
+#else
+static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_n, int req_comp, unsigned int x, unsigned int y)
+{
+   int i,j;
+   stbi__uint16 *good;
+
+   if (req_comp == img_n) return data;
+   STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+   good = (stbi__uint16 *) stbi__malloc(req_comp * x * y * 2);
+   if (good == NULL) {
+      STBI_FREE(data);
+      return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory");
+   }
+
+   for (j=0; j < (int) y; ++j) {
+      stbi__uint16 *src  = data + j * x * img_n   ;
+      stbi__uint16 *dest = good + j * x * req_comp;
+
+      #define STBI__COMBO(a,b)  ((a)*8+(b))
+      #define STBI__CASE(a,b)   case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
+      // convert source image with img_n components to one with req_comp components;
+      // avoid switch per pixel, so use switch per scanline and massive macros
+      switch (STBI__COMBO(img_n, req_comp)) {
+         STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=0xffff;                                     } break;
+         STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0];                                     } break;
+         STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=0xffff;                     } break;
+         STBI__CASE(2,1) { dest[0]=src[0];                                                     } break;
+         STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0];                                     } break;
+         STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1];                     } break;
+         STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=0xffff;        } break;
+         STBI__CASE(3,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]);                   } break;
+         STBI__CASE(3,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = 0xffff; } break;
+         STBI__CASE(4,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]);                   } break;
+         STBI__CASE(4,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = src[3]; } break;
+         STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];                       } break;
+         default: STBI_ASSERT(0);
+      }
+      #undef STBI__CASE
+   }
+
+   STBI_FREE(data);
+   return good;
+}
+#endif
+
+#ifndef STBI_NO_LINEAR
+static float   *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
+{
+   int i,k,n;
+   float *output;
+   if (!data) return NULL;
+   output = (float *) stbi__malloc_mad4(x, y, comp, sizeof(float), 0);
+   if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); }
+   // compute number of non-alpha components
+   if (comp & 1) n = comp; else n = comp-1;
+   for (i=0; i < x*y; ++i) {
+      for (k=0; k < n; ++k) {
+         output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale);
+      }
+   }
+   if (n < comp) {
+      for (i=0; i < x*y; ++i) {
+         output[i*comp + n] = data[i*comp + n]/255.0f;
+      }
+   }
+   STBI_FREE(data);
+   return output;
+}
+#endif
+
+#ifndef STBI_NO_HDR
+#define stbi__float2int(x)   ((int) (x))
+static stbi_uc *stbi__hdr_to_ldr(float   *data, int x, int y, int comp)
+{
+   int i,k,n;
+   stbi_uc *output;
+   if (!data) return NULL;
+   output = (stbi_uc *) stbi__malloc_mad3(x, y, comp, 0);
+   if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); }
+   // compute number of non-alpha components
+   if (comp & 1) n = comp; else n = comp-1;
+   for (i=0; i < x*y; ++i) {
+      for (k=0; k < n; ++k) {
+         float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f;
+         if (z < 0) z = 0;
+         if (z > 255) z = 255;
+         output[i*comp + k] = (stbi_uc) stbi__float2int(z);
+      }
+      if (k < comp) {
+         float z = data[i*comp+k] * 255 + 0.5f;
+         if (z < 0) z = 0;
+         if (z > 255) z = 255;
+         output[i*comp + k] = (stbi_uc) stbi__float2int(z);
+      }
+   }
+   STBI_FREE(data);
+   return output;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//  "baseline" JPEG/JFIF decoder
+//
+//    simple implementation
+//      - doesn't support delayed output of y-dimension
+//      - simple interface (only one output format: 8-bit interleaved RGB)
+//      - doesn't try to recover corrupt jpegs
+//      - doesn't allow partial loading, loading multiple at once
+//      - still fast on x86 (copying globals into locals doesn't help x86)
+//      - allocates lots of intermediate memory (full size of all components)
+//        - non-interleaved case requires this anyway
+//        - allows good upsampling (see next)
+//    high-quality
+//      - upsampled channels are bilinearly interpolated, even across blocks
+//      - quality integer IDCT derived from IJG's 'slow'
+//    performance
+//      - fast huffman; reasonable integer IDCT
+//      - some SIMD kernels for common paths on targets with SSE2/NEON
+//      - uses a lot of intermediate memory, could cache poorly
+
+#ifndef STBI_NO_JPEG
+
+// huffman decoding acceleration
+#define FAST_BITS   9  // larger handles more cases; smaller stomps less cache
+
+typedef struct
+{
+   stbi_uc  fast[1 << FAST_BITS];
+   // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
+   stbi__uint16 code[256];
+   stbi_uc  values[256];
+   stbi_uc  size[257];
+   unsigned int maxcode[18];
+   int    delta[17];   // old 'firstsymbol' - old 'firstcode'
+} stbi__huffman;
+
+typedef struct
+{
+   stbi__context *s;
+   stbi__huffman huff_dc[4];
+   stbi__huffman huff_ac[4];
+   stbi__uint16 dequant[4][64];
+   stbi__int16 fast_ac[4][1 << FAST_BITS];
+
+// sizes for components, interleaved MCUs
+   int img_h_max, img_v_max;
+   int img_mcu_x, img_mcu_y;
+   int img_mcu_w, img_mcu_h;
+
+// definition of jpeg image component
+   struct
+   {
+      int id;
+      int h,v;
+      int tq;
+      int hd,ha;
+      int dc_pred;
+
+      int x,y,w2,h2;
+      stbi_uc *data;
+      void *raw_data, *raw_coeff;
+      stbi_uc *linebuf;
+      short   *coeff;   // progressive only
+      int      coeff_w, coeff_h; // number of 8x8 coefficient blocks
+   } img_comp[4];
+
+   stbi__uint32   code_buffer; // jpeg entropy-coded buffer
+   int            code_bits;   // number of valid bits
+   unsigned char  marker;      // marker seen while filling entropy buffer
+   int            nomore;      // flag if we saw a marker so must stop
+
+   int            progressive;
+   int            spec_start;
+   int            spec_end;
+   int            succ_high;
+   int            succ_low;
+   int            eob_run;
+   int            jfif;
+   int            app14_color_transform; // Adobe APP14 tag
+   int            rgb;
+
+   int scan_n, order[4];
+   int restart_interval, todo;
+
+// kernels
+   void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]);
+   void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step);
+   stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs);
+} stbi__jpeg;
+
+static int stbi__build_huffman(stbi__huffman *h, int *count)
+{
+   int i,j,k=0;
+   unsigned int code;
+   // build size list for each symbol (from JPEG spec)
+   for (i=0; i < 16; ++i)
+      for (j=0; j < count[i]; ++j)
+         h->size[k++] = (stbi_uc) (i+1);
+   h->size[k] = 0;
+
+   // compute actual symbols (from jpeg spec)
+   code = 0;
+   k = 0;
+   for(j=1; j <= 16; ++j) {
+      // compute delta to add to code to compute symbol id
+      h->delta[j] = k - code;
+      if (h->size[k] == j) {
+         while (h->size[k] == j)
+            h->code[k++] = (stbi__uint16) (code++);
+         if (code-1 >= (1u << j)) return stbi__err("bad code lengths","Corrupt JPEG");
+      }
+      // compute largest code + 1 for this size, preshifted as needed later
+      h->maxcode[j] = code << (16-j);
+      code <<= 1;
+   }
+   h->maxcode[j] = 0xffffffff;
+
+   // build non-spec acceleration table; 255 is flag for not-accelerated
+   memset(h->fast, 255, 1 << FAST_BITS);
+   for (i=0; i < k; ++i) {
+      int s = h->size[i];
+      if (s <= FAST_BITS) {
+         int c = h->code[i] << (FAST_BITS-s);
+         int m = 1 << (FAST_BITS-s);
+         for (j=0; j < m; ++j) {
+            h->fast[c+j] = (stbi_uc) i;
+         }
+      }
+   }
+   return 1;
+}
+
+// build a table that decodes both magnitude and value of small ACs in
+// one go.
+static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h)
+{
+   int i;
+   for (i=0; i < (1 << FAST_BITS); ++i) {
+      stbi_uc fast = h->fast[i];
+      fast_ac[i] = 0;
+      if (fast < 255) {
+         int rs = h->values[fast];
+         int run = (rs >> 4) & 15;
+         int magbits = rs & 15;
+         int len = h->size[fast];
+
+         if (magbits && len + magbits <= FAST_BITS) {
+            // magnitude code followed by receive_extend code
+            int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits);
+            int m = 1 << (magbits - 1);
+            if (k < m) k += (~0U << magbits) + 1;
+            // if the result is small enough, we can fit it in fast_ac table
+            if (k >= -128 && k <= 127)
+               fast_ac[i] = (stbi__int16) ((k * 256) + (run * 16) + (len + magbits));
+         }
+      }
+   }
+}
+
+static void stbi__grow_buffer_unsafe(stbi__jpeg *j)
+{
+   do {
+      unsigned int b = j->nomore ? 0 : stbi__get8(j->s);
+      if (b == 0xff) {
+         int c = stbi__get8(j->s);
+         while (c == 0xff) c = stbi__get8(j->s); // consume fill bytes
+         if (c != 0) {
+            j->marker = (unsigned char) c;
+            j->nomore = 1;
+            return;
+         }
+      }
+      j->code_buffer |= b << (24 - j->code_bits);
+      j->code_bits += 8;
+   } while (j->code_bits <= 24);
+}
+
+// (1 << n) - 1
+static const stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535};
+
+// decode a jpeg huffman value from the bitstream
+stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h)
+{
+   unsigned int temp;
+   int c,k;
+
+   if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+
+   // look at the top FAST_BITS and determine what symbol ID it is,
+   // if the code is <= FAST_BITS
+   c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+   k = h->fast[c];
+   if (k < 255) {
+      int s = h->size[k];
+      if (s > j->code_bits)
+         return -1;
+      j->code_buffer <<= s;
+      j->code_bits -= s;
+      return h->values[k];
+   }
+
+   // naive test is to shift the code_buffer down so k bits are
+   // valid, then test against maxcode. To speed this up, we've
+   // preshifted maxcode left so that it has (16-k) 0s at the
+   // end; in other words, regardless of the number of bits, it
+   // wants to be compared against something shifted to have 16;
+   // that way we don't need to shift inside the loop.
+   temp = j->code_buffer >> 16;
+   for (k=FAST_BITS+1 ; ; ++k)
+      if (temp < h->maxcode[k])
+         break;
+   if (k == 17) {
+      // error! code not found
+      j->code_bits -= 16;
+      return -1;
+   }
+
+   if (k > j->code_bits)
+      return -1;
+
+   // convert the huffman code to the symbol id
+   c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
+   STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
+
+   // convert the id to a symbol
+   j->code_bits -= k;
+   j->code_buffer <<= k;
+   return h->values[c];
+}
+
+// bias[n] = (-1<<n) + 1
+static const int stbi__jbias[16] = {0,-1,-3,-7,-15,-31,-63,-127,-255,-511,-1023,-2047,-4095,-8191,-16383,-32767};
+
+// combined JPEG 'receive' and JPEG 'extend', since baseline
+// always extends everything it receives.
+stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n)
+{
+   unsigned int k;
+   int sgn;
+   if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+
+   sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB
+   k = stbi_lrot(j->code_buffer, n);
+   STBI_ASSERT(n >= 0 && n < (int) (sizeof(stbi__bmask)/sizeof(*stbi__bmask)));
+   j->code_buffer = k & ~stbi__bmask[n];
+   k &= stbi__bmask[n];
+   j->code_bits -= n;
+   return k + (stbi__jbias[n] & ~sgn);
+}
+
+// get some unsigned bits
+stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n)
+{
+   unsigned int k;
+   if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+   k = stbi_lrot(j->code_buffer, n);
+   j->code_buffer = k & ~stbi__bmask[n];
+   k &= stbi__bmask[n];
+   j->code_bits -= n;
+   return k;
+}
+
+stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j)
+{
+   unsigned int k;
+   if (j->code_bits < 1) stbi__grow_buffer_unsafe(j);
+   k = j->code_buffer;
+   j->code_buffer <<= 1;
+   --j->code_bits;
+   return k & 0x80000000;
+}
+
+// given a value that's at position X in the zigzag stream,
+// where does it appear in the 8x8 matrix coded as row-major?
+static const stbi_uc stbi__jpeg_dezigzag[64+15] =
+{
+    0,  1,  8, 16,  9,  2,  3, 10,
+   17, 24, 32, 25, 18, 11,  4,  5,
+   12, 19, 26, 33, 40, 48, 41, 34,
+   27, 20, 13,  6,  7, 14, 21, 28,
+   35, 42, 49, 56, 57, 50, 43, 36,
+   29, 22, 15, 23, 30, 37, 44, 51,
+   58, 59, 52, 45, 38, 31, 39, 46,
+   53, 60, 61, 54, 47, 55, 62, 63,
+   // let corrupt input sample past end
+   63, 63, 63, 63, 63, 63, 63, 63,
+   63, 63, 63, 63, 63, 63, 63
+};
+
+// decode one 64-entry block--
+static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi__uint16 *dequant)
+{
+   int diff,dc,k;
+   int t;
+
+   if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+   t = stbi__jpeg_huff_decode(j, hdc);
+   if (t < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+
+   // 0 all the ac values now so we can do it 32-bits at a time
+   memset(data,0,64*sizeof(data[0]));
+
+   diff = t ? stbi__extend_receive(j, t) : 0;
+   dc = j->img_comp[b].dc_pred + diff;
+   j->img_comp[b].dc_pred = dc;
+   data[0] = (short) (dc * dequant[0]);
+
+   // decode AC components, see JPEG spec
+   k = 1;
+   do {
+      unsigned int zig;
+      int c,r,s;
+      if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+      c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+      r = fac[c];
+      if (r) { // fast-AC path
+         k += (r >> 4) & 15; // run
+         s = r & 15; // combined length
+         j->code_buffer <<= s;
+         j->code_bits -= s;
+         // decode into unzigzag'd location
+         zig = stbi__jpeg_dezigzag[k++];
+         data[zig] = (short) ((r >> 8) * dequant[zig]);
+      } else {
+         int rs = stbi__jpeg_huff_decode(j, hac);
+         if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+         s = rs & 15;
+         r = rs >> 4;
+         if (s == 0) {
+            if (rs != 0xf0) break; // end block
+            k += 16;
+         } else {
+            k += r;
+            // decode into unzigzag'd location
+            zig = stbi__jpeg_dezigzag[k++];
+            data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]);
+         }
+      }
+   } while (k < 64);
+   return 1;
+}
+
+static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b)
+{
+   int diff,dc;
+   int t;
+   if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+
+   if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+
+   if (j->succ_high == 0) {
+      // first scan for DC coefficient, must be first
+      memset(data,0,64*sizeof(data[0])); // 0 all the ac values now
+      t = stbi__jpeg_huff_decode(j, hdc);
+      diff = t ? stbi__extend_receive(j, t) : 0;
+
+      dc = j->img_comp[b].dc_pred + diff;
+      j->img_comp[b].dc_pred = dc;
+      data[0] = (short) (dc << j->succ_low);
+   } else {
+      // refinement scan for DC coefficient
+      if (stbi__jpeg_get_bit(j))
+         data[0] += (short) (1 << j->succ_low);
+   }
+   return 1;
+}
+
+// @OPTIMIZE: store non-zigzagged during the decode passes,
+// and only de-zigzag when dequantizing
+static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac)
+{
+   int k;
+   if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+
+   if (j->succ_high == 0) {
+      int shift = j->succ_low;
+
+      if (j->eob_run) {
+         --j->eob_run;
+         return 1;
+      }
+
+      k = j->spec_start;
+      do {
+         unsigned int zig;
+         int c,r,s;
+         if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+         c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+         r = fac[c];
+         if (r) { // fast-AC path
+            k += (r >> 4) & 15; // run
+            s = r & 15; // combined length
+            j->code_buffer <<= s;
+            j->code_bits -= s;
+            zig = stbi__jpeg_dezigzag[k++];
+            data[zig] = (short) ((r >> 8) << shift);
+         } else {
+            int rs = stbi__jpeg_huff_decode(j, hac);
+            if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+            s = rs & 15;
+            r = rs >> 4;
+            if (s == 0) {
+               if (r < 15) {
+                  j->eob_run = (1 << r);
+                  if (r)
+                     j->eob_run += stbi__jpeg_get_bits(j, r);
+                  --j->eob_run;
+                  break;
+               }
+               k += 16;
+            } else {
+               k += r;
+               zig = stbi__jpeg_dezigzag[k++];
+               data[zig] = (short) (stbi__extend_receive(j,s) << shift);
+            }
+         }
+      } while (k <= j->spec_end);
+   } else {
+      // refinement scan for these AC coefficients
+
+      short bit = (short) (1 << j->succ_low);
+
+      if (j->eob_run) {
+         --j->eob_run;
+         for (k = j->spec_start; k <= j->spec_end; ++k) {
+            short *p = &data[stbi__jpeg_dezigzag[k]];
+            if (*p != 0)
+               if (stbi__jpeg_get_bit(j))
+                  if ((*p & bit)==0) {
+                     if (*p > 0)
+                        *p += bit;
+                     else
+                        *p -= bit;
+                  }
+         }
+      } else {
+         k = j->spec_start;
+         do {
+            int r,s;
+            int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh
+            if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+            s = rs & 15;
+            r = rs >> 4;
+            if (s == 0) {
+               if (r < 15) {
+                  j->eob_run = (1 << r) - 1;
+                  if (r)
+                     j->eob_run += stbi__jpeg_get_bits(j, r);
+                  r = 64; // force end of block
+               } else {
+                  // r=15 s=0 should write 16 0s, so we just do
+                  // a run of 15 0s and then write s (which is 0),
+                  // so we don't have to do anything special here
+               }
+            } else {
+               if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG");
+               // sign bit
+               if (stbi__jpeg_get_bit(j))
+                  s = bit;
+               else
+                  s = -bit;
+            }
+
+            // advance by r
+            while (k <= j->spec_end) {
+               short *p = &data[stbi__jpeg_dezigzag[k++]];
+               if (*p != 0) {
+                  if (stbi__jpeg_get_bit(j))
+                     if ((*p & bit)==0) {
+                        if (*p > 0)
+                           *p += bit;
+                        else
+                           *p -= bit;
+                     }
+               } else {
+                  if (r == 0) {
+                     *p = (short) s;
+                     break;
+                  }
+                  --r;
+               }
+            }
+         } while (k <= j->spec_end);
+      }
+   }
+   return 1;
+}
+
+// take a -128..127 value and stbi__clamp it and convert to 0..255
+stbi_inline static stbi_uc stbi__clamp(int x)
+{
+   // trick to use a single test to catch both cases
+   if ((unsigned int) x > 255) {
+      if (x < 0) return 0;
+      if (x > 255) return 255;
+   }
+   return (stbi_uc) x;
+}
+
+#define stbi__f2f(x)  ((int) (((x) * 4096 + 0.5)))
+#define stbi__fsh(x)  ((x) * 4096)
+
+// derived from jidctint -- DCT_ISLOW
+#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \
+   int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \
+   p2 = s2;                                    \
+   p3 = s6;                                    \
+   p1 = (p2+p3) * stbi__f2f(0.5411961f);       \
+   t2 = p1 + p3*stbi__f2f(-1.847759065f);      \
+   t3 = p1 + p2*stbi__f2f( 0.765366865f);      \
+   p2 = s0;                                    \
+   p3 = s4;                                    \
+   t0 = stbi__fsh(p2+p3);                      \
+   t1 = stbi__fsh(p2-p3);                      \
+   x0 = t0+t3;                                 \
+   x3 = t0-t3;                                 \
+   x1 = t1+t2;                                 \
+   x2 = t1-t2;                                 \
+   t0 = s7;                                    \
+   t1 = s5;                                    \
+   t2 = s3;                                    \
+   t3 = s1;                                    \
+   p3 = t0+t2;                                 \
+   p4 = t1+t3;                                 \
+   p1 = t0+t3;                                 \
+   p2 = t1+t2;                                 \
+   p5 = (p3+p4)*stbi__f2f( 1.175875602f);      \
+   t0 = t0*stbi__f2f( 0.298631336f);           \
+   t1 = t1*stbi__f2f( 2.053119869f);           \
+   t2 = t2*stbi__f2f( 3.072711026f);           \
+   t3 = t3*stbi__f2f( 1.501321110f);           \
+   p1 = p5 + p1*stbi__f2f(-0.899976223f);      \
+   p2 = p5 + p2*stbi__f2f(-2.562915447f);      \
+   p3 = p3*stbi__f2f(-1.961570560f);           \
+   p4 = p4*stbi__f2f(-0.390180644f);           \
+   t3 += p1+p4;                                \
+   t2 += p2+p3;                                \
+   t1 += p2+p4;                                \
+   t0 += p1+p3;
+
+static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64])
+{
+   int i,val[64],*v=val;
+   stbi_uc *o;
+   short *d = data;
+
+   // columns
+   for (i=0; i < 8; ++i,++d, ++v) {
+      // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
+      if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
+           && d[40]==0 && d[48]==0 && d[56]==0) {
+         //    no shortcut                 0     seconds
+         //    (1|2|3|4|5|6|7)==0          0     seconds
+         //    all separate               -0.047 seconds
+         //    1 && 2|3 && 4|5 && 6|7:    -0.047 seconds
+         int dcterm = d[0]*4;
+         v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
+      } else {
+         STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56])
+         // constants scaled things up by 1<<12; let's bring them back
+         // down, but keep 2 extra bits of precision
+         x0 += 512; x1 += 512; x2 += 512; x3 += 512;
+         v[ 0] = (x0+t3) >> 10;
+         v[56] = (x0-t3) >> 10;
+         v[ 8] = (x1+t2) >> 10;
+         v[48] = (x1-t2) >> 10;
+         v[16] = (x2+t1) >> 10;
+         v[40] = (x2-t1) >> 10;
+         v[24] = (x3+t0) >> 10;
+         v[32] = (x3-t0) >> 10;
+      }
+   }
+
+   for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
+      // no fast case since the first 1D IDCT spread components out
+      STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
+      // constants scaled things up by 1<<12, plus we had 1<<2 from first
+      // loop, plus horizontal and vertical each scale by sqrt(8) so together
+      // we've got an extra 1<<3, so 1<<17 total we need to remove.
+      // so we want to round that, which means adding 0.5 * 1<<17,
+      // aka 65536. Also, we'll end up with -128 to 127 that we want
+      // to encode as 0..255 by adding 128, so we'll add that before the shift
+      x0 += 65536 + (128<<17);
+      x1 += 65536 + (128<<17);
+      x2 += 65536 + (128<<17);
+      x3 += 65536 + (128<<17);
+      // tried computing the shifts into temps, or'ing the temps to see
+      // if any were out of range, but that was slower
+      o[0] = stbi__clamp((x0+t3) >> 17);
+      o[7] = stbi__clamp((x0-t3) >> 17);
+      o[1] = stbi__clamp((x1+t2) >> 17);
+      o[6] = stbi__clamp((x1-t2) >> 17);
+      o[2] = stbi__clamp((x2+t1) >> 17);
+      o[5] = stbi__clamp((x2-t1) >> 17);
+      o[3] = stbi__clamp((x3+t0) >> 17);
+      o[4] = stbi__clamp((x3-t0) >> 17);
+   }
+}
+
+#ifdef STBI_SSE2
+// sse2 integer IDCT. not the fastest possible implementation but it
+// produces bit-identical results to the generic C version so it's
+// fully "transparent".
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
+{
+   // This is constructed to match our regular (generic) integer IDCT exactly.
+   __m128i row0, row1, row2, row3, row4, row5, row6, row7;
+   __m128i tmp;
+
+   // dot product constant: even elems=x, odd elems=y
+   #define dct_const(x,y)  _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y))
+
+   // out(0) = c0[even]*x + c0[odd]*y   (c0, x, y 16-bit, out 32-bit)
+   // out(1) = c1[even]*x + c1[odd]*y
+   #define dct_rot(out0,out1, x,y,c0,c1) \
+      __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \
+      __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \
+      __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \
+      __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \
+      __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \
+      __m128i out1##_h = _mm_madd_epi16(c0##hi, c1)
+
+   // out = in << 12  (in 16-bit, out 32-bit)
+   #define dct_widen(out, in) \
+      __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \
+      __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4)
+
+   // wide add
+   #define dct_wadd(out, a, b) \
+      __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \
+      __m128i out##_h = _mm_add_epi32(a##_h, b##_h)
+
+   // wide sub
+   #define dct_wsub(out, a, b) \
+      __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \
+      __m128i out##_h = _mm_sub_epi32(a##_h, b##_h)
+
+   // butterfly a/b, add bias, then shift by "s" and pack
+   #define dct_bfly32o(out0, out1, a,b,bias,s) \
+      { \
+         __m128i abiased_l = _mm_add_epi32(a##_l, bias); \
+         __m128i abiased_h = _mm_add_epi32(a##_h, bias); \
+         dct_wadd(sum, abiased, b); \
+         dct_wsub(dif, abiased, b); \
+         out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \
+         out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \
+      }
+
+   // 8-bit interleave step (for transposes)
+   #define dct_interleave8(a, b) \
+      tmp = a; \
+      a = _mm_unpacklo_epi8(a, b); \
+      b = _mm_unpackhi_epi8(tmp, b)
+
+   // 16-bit interleave step (for transposes)
+   #define dct_interleave16(a, b) \
+      tmp = a; \
+      a = _mm_unpacklo_epi16(a, b); \
+      b = _mm_unpackhi_epi16(tmp, b)
+
+   #define dct_pass(bias,shift) \
+      { \
+         /* even part */ \
+         dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \
+         __m128i sum04 = _mm_add_epi16(row0, row4); \
+         __m128i dif04 = _mm_sub_epi16(row0, row4); \
+         dct_widen(t0e, sum04); \
+         dct_widen(t1e, dif04); \
+         dct_wadd(x0, t0e, t3e); \
+         dct_wsub(x3, t0e, t3e); \
+         dct_wadd(x1, t1e, t2e); \
+         dct_wsub(x2, t1e, t2e); \
+         /* odd part */ \
+         dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \
+         dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \
+         __m128i sum17 = _mm_add_epi16(row1, row7); \
+         __m128i sum35 = _mm_add_epi16(row3, row5); \
+         dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \
+         dct_wadd(x4, y0o, y4o); \
+         dct_wadd(x5, y1o, y5o); \
+         dct_wadd(x6, y2o, y5o); \
+         dct_wadd(x7, y3o, y4o); \
+         dct_bfly32o(row0,row7, x0,x7,bias,shift); \
+         dct_bfly32o(row1,row6, x1,x6,bias,shift); \
+         dct_bfly32o(row2,row5, x2,x5,bias,shift); \
+         dct_bfly32o(row3,row4, x3,x4,bias,shift); \
+      }
+
+   __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f));
+   __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f));
+   __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f));
+   __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f));
+   __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f));
+   __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f));
+   __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f));
+   __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f));
+
+   // rounding biases in column/row passes, see stbi__idct_block for explanation.
+   __m128i bias_0 = _mm_set1_epi32(512);
+   __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17));
+
+   // load
+   row0 = _mm_load_si128((const __m128i *) (data + 0*8));
+   row1 = _mm_load_si128((const __m128i *) (data + 1*8));
+   row2 = _mm_load_si128((const __m128i *) (data + 2*8));
+   row3 = _mm_load_si128((const __m128i *) (data + 3*8));
+   row4 = _mm_load_si128((const __m128i *) (data + 4*8));
+   row5 = _mm_load_si128((const __m128i *) (data + 5*8));
+   row6 = _mm_load_si128((const __m128i *) (data + 6*8));
+   row7 = _mm_load_si128((const __m128i *) (data + 7*8));
+
+   // column pass
+   dct_pass(bias_0, 10);
+
+   {
+      // 16bit 8x8 transpose pass 1
+      dct_interleave16(row0, row4);
+      dct_interleave16(row1, row5);
+      dct_interleave16(row2, row6);
+      dct_interleave16(row3, row7);
+
+      // transpose pass 2
+      dct_interleave16(row0, row2);
+      dct_interleave16(row1, row3);
+      dct_interleave16(row4, row6);
+      dct_interleave16(row5, row7);
+
+      // transpose pass 3
+      dct_interleave16(row0, row1);
+      dct_interleave16(row2, row3);
+      dct_interleave16(row4, row5);
+      dct_interleave16(row6, row7);
+   }
+
+   // row pass
+   dct_pass(bias_1, 17);
+
+   {
+      // pack
+      __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7
+      __m128i p1 = _mm_packus_epi16(row2, row3);
+      __m128i p2 = _mm_packus_epi16(row4, row5);
+      __m128i p3 = _mm_packus_epi16(row6, row7);
+
+      // 8bit 8x8 transpose pass 1
+      dct_interleave8(p0, p2); // a0e0a1e1...
+      dct_interleave8(p1, p3); // c0g0c1g1...
+
+      // transpose pass 2
+      dct_interleave8(p0, p1); // a0c0e0g0...
+      dct_interleave8(p2, p3); // b0d0f0h0...
+
+      // transpose pass 3
+      dct_interleave8(p0, p2); // a0b0c0d0...
+      dct_interleave8(p1, p3); // a4b4c4d4...
+
+      // store
+      _mm_storel_epi64((__m128i *) out, p0); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, p2); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, p1); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, p3); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e));
+   }
+
+#undef dct_const
+#undef dct_rot
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_interleave8
+#undef dct_interleave16
+#undef dct_pass
+}
+
+#endif // STBI_SSE2
+
+#ifdef STBI_NEON
+
+// NEON integer IDCT. should produce bit-identical
+// results to the generic C version.
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
+{
+   int16x8_t row0, row1, row2, row3, row4, row5, row6, row7;
+
+   int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f));
+   int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f));
+   int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f));
+   int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f));
+   int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f));
+   int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f));
+   int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f));
+   int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f));
+   int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f));
+   int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f));
+   int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f));
+   int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f));
+
+#define dct_long_mul(out, inq, coeff) \
+   int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \
+   int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff)
+
+#define dct_long_mac(out, acc, inq, coeff) \
+   int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \
+   int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff)
+
+#define dct_widen(out, inq) \
+   int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \
+   int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12)
+
+// wide add
+#define dct_wadd(out, a, b) \
+   int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \
+   int32x4_t out##_h = vaddq_s32(a##_h, b##_h)
+
+// wide sub
+#define dct_wsub(out, a, b) \
+   int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \
+   int32x4_t out##_h = vsubq_s32(a##_h, b##_h)
+
+// butterfly a/b, then shift using "shiftop" by "s" and pack
+#define dct_bfly32o(out0,out1, a,b,shiftop,s) \
+   { \
+      dct_wadd(sum, a, b); \
+      dct_wsub(dif, a, b); \
+      out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \
+      out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \
+   }
+
+#define dct_pass(shiftop, shift) \
+   { \
+      /* even part */ \
+      int16x8_t sum26 = vaddq_s16(row2, row6); \
+      dct_long_mul(p1e, sum26, rot0_0); \
+      dct_long_mac(t2e, p1e, row6, rot0_1); \
+      dct_long_mac(t3e, p1e, row2, rot0_2); \
+      int16x8_t sum04 = vaddq_s16(row0, row4); \
+      int16x8_t dif04 = vsubq_s16(row0, row4); \
+      dct_widen(t0e, sum04); \
+      dct_widen(t1e, dif04); \
+      dct_wadd(x0, t0e, t3e); \
+      dct_wsub(x3, t0e, t3e); \
+      dct_wadd(x1, t1e, t2e); \
+      dct_wsub(x2, t1e, t2e); \
+      /* odd part */ \
+      int16x8_t sum15 = vaddq_s16(row1, row5); \
+      int16x8_t sum17 = vaddq_s16(row1, row7); \
+      int16x8_t sum35 = vaddq_s16(row3, row5); \
+      int16x8_t sum37 = vaddq_s16(row3, row7); \
+      int16x8_t sumodd = vaddq_s16(sum17, sum35); \
+      dct_long_mul(p5o, sumodd, rot1_0); \
+      dct_long_mac(p1o, p5o, sum17, rot1_1); \
+      dct_long_mac(p2o, p5o, sum35, rot1_2); \
+      dct_long_mul(p3o, sum37, rot2_0); \
+      dct_long_mul(p4o, sum15, rot2_1); \
+      dct_wadd(sump13o, p1o, p3o); \
+      dct_wadd(sump24o, p2o, p4o); \
+      dct_wadd(sump23o, p2o, p3o); \
+      dct_wadd(sump14o, p1o, p4o); \
+      dct_long_mac(x4, sump13o, row7, rot3_0); \
+      dct_long_mac(x5, sump24o, row5, rot3_1); \
+      dct_long_mac(x6, sump23o, row3, rot3_2); \
+      dct_long_mac(x7, sump14o, row1, rot3_3); \
+      dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \
+      dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \
+      dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \
+      dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \
+   }
+
+   // load
+   row0 = vld1q_s16(data + 0*8);
+   row1 = vld1q_s16(data + 1*8);
+   row2 = vld1q_s16(data + 2*8);
+   row3 = vld1q_s16(data + 3*8);
+   row4 = vld1q_s16(data + 4*8);
+   row5 = vld1q_s16(data + 5*8);
+   row6 = vld1q_s16(data + 6*8);
+   row7 = vld1q_s16(data + 7*8);
+
+   // add DC bias
+   row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0));
+
+   // column pass
+   dct_pass(vrshrn_n_s32, 10);
+
+   // 16bit 8x8 transpose
+   {
+// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively.
+// whether compilers actually get this is another story, sadly.
+#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; }
+#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); }
+#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); }
+
+      // pass 1
+      dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6
+      dct_trn16(row2, row3);
+      dct_trn16(row4, row5);
+      dct_trn16(row6, row7);
+
+      // pass 2
+      dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4
+      dct_trn32(row1, row3);
+      dct_trn32(row4, row6);
+      dct_trn32(row5, row7);
+
+      // pass 3
+      dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0
+      dct_trn64(row1, row5);
+      dct_trn64(row2, row6);
+      dct_trn64(row3, row7);
+
+#undef dct_trn16
+#undef dct_trn32
+#undef dct_trn64
+   }
+
+   // row pass
+   // vrshrn_n_s32 only supports shifts up to 16, we need
+   // 17. so do a non-rounding shift of 16 first then follow
+   // up with a rounding shift by 1.
+   dct_pass(vshrn_n_s32, 16);
+
+   {
+      // pack and round
+      uint8x8_t p0 = vqrshrun_n_s16(row0, 1);
+      uint8x8_t p1 = vqrshrun_n_s16(row1, 1);
+      uint8x8_t p2 = vqrshrun_n_s16(row2, 1);
+      uint8x8_t p3 = vqrshrun_n_s16(row3, 1);
+      uint8x8_t p4 = vqrshrun_n_s16(row4, 1);
+      uint8x8_t p5 = vqrshrun_n_s16(row5, 1);
+      uint8x8_t p6 = vqrshrun_n_s16(row6, 1);
+      uint8x8_t p7 = vqrshrun_n_s16(row7, 1);
+
+      // again, these can translate into one instruction, but often don't.
+#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; }
+#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); }
+#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); }
+
+      // sadly can't use interleaved stores here since we only write
+      // 8 bytes to each scan line!
+
+      // 8x8 8-bit transpose pass 1
+      dct_trn8_8(p0, p1);
+      dct_trn8_8(p2, p3);
+      dct_trn8_8(p4, p5);
+      dct_trn8_8(p6, p7);
+
+      // pass 2
+      dct_trn8_16(p0, p2);
+      dct_trn8_16(p1, p3);
+      dct_trn8_16(p4, p6);
+      dct_trn8_16(p5, p7);
+
+      // pass 3
+      dct_trn8_32(p0, p4);
+      dct_trn8_32(p1, p5);
+      dct_trn8_32(p2, p6);
+      dct_trn8_32(p3, p7);
+
+      // store
+      vst1_u8(out, p0); out += out_stride;
+      vst1_u8(out, p1); out += out_stride;
+      vst1_u8(out, p2); out += out_stride;
+      vst1_u8(out, p3); out += out_stride;
+      vst1_u8(out, p4); out += out_stride;
+      vst1_u8(out, p5); out += out_stride;
+      vst1_u8(out, p6); out += out_stride;
+      vst1_u8(out, p7);
+
+#undef dct_trn8_8
+#undef dct_trn8_16
+#undef dct_trn8_32
+   }
+
+#undef dct_long_mul
+#undef dct_long_mac
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_pass
+}
+
+#endif // STBI_NEON
+
+#define STBI__MARKER_none  0xff
+// if there's a pending marker from the entropy stream, return that
+// otherwise, fetch from the stream and get a marker. if there's no
+// marker, return 0xff, which is never a valid marker value
+static stbi_uc stbi__get_marker(stbi__jpeg *j)
+{
+   stbi_uc x;
+   if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; }
+   x = stbi__get8(j->s);
+   if (x != 0xff) return STBI__MARKER_none;
+   while (x == 0xff)
+      x = stbi__get8(j->s); // consume repeated 0xff fill bytes
+   return x;
+}
+
+// in each scan, we'll have scan_n components, and the order
+// of the components is specified by order[]
+#define STBI__RESTART(x)     ((x) >= 0xd0 && (x) <= 0xd7)
+
+// after a restart interval, stbi__jpeg_reset the entropy decoder and
+// the dc prediction
+static void stbi__jpeg_reset(stbi__jpeg *j)
+{
+   j->code_bits = 0;
+   j->code_buffer = 0;
+   j->nomore = 0;
+   j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0;
+   j->marker = STBI__MARKER_none;
+   j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
+   j->eob_run = 0;
+   // no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
+   // since we don't even allow 1<<30 pixels
+}
+
+static int stbi__parse_entropy_coded_data(stbi__jpeg *z)
+{
+   stbi__jpeg_reset(z);
+   if (!z->progressive) {
+      if (z->scan_n == 1) {
+         int i,j;
+         STBI_SIMD_ALIGN(short, data[64]);
+         int n = z->order[0];
+         // non-interleaved data, we just need to process one block at a time,
+         // in trivial scanline order
+         // number of blocks to do just depends on how many actual "pixels" this
+         // component has, independent of interleaved MCU blocking and such
+         int w = (z->img_comp[n].x+7) >> 3;
+         int h = (z->img_comp[n].y+7) >> 3;
+         for (j=0; j < h; ++j) {
+            for (i=0; i < w; ++i) {
+               int ha = z->img_comp[n].ha;
+               if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
+               z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
+               // every data block is an MCU, so countdown the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  // if it's NOT a restart, then just bail, so we get corrupt data
+                  // rather than no data
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      } else { // interleaved
+         int i,j,k,x,y;
+         STBI_SIMD_ALIGN(short, data[64]);
+         for (j=0; j < z->img_mcu_y; ++j) {
+            for (i=0; i < z->img_mcu_x; ++i) {
+               // scan an interleaved mcu... process scan_n components in order
+               for (k=0; k < z->scan_n; ++k) {
+                  int n = z->order[k];
+                  // scan out an mcu's worth of this component; that's just determined
+                  // by the basic H and V specified for the component
+                  for (y=0; y < z->img_comp[n].v; ++y) {
+                     for (x=0; x < z->img_comp[n].h; ++x) {
+                        int x2 = (i*z->img_comp[n].h + x)*8;
+                        int y2 = (j*z->img_comp[n].v + y)*8;
+                        int ha = z->img_comp[n].ha;
+                        if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
+                        z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data);
+                     }
+                  }
+               }
+               // after all interleaved components, that's an interleaved MCU,
+               // so now count down the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      }
+   } else {
+      if (z->scan_n == 1) {
+         int i,j;
+         int n = z->order[0];
+         // non-interleaved data, we just need to process one block at a time,
+         // in trivial scanline order
+         // number of blocks to do just depends on how many actual "pixels" this
+         // component has, independent of interleaved MCU blocking and such
+         int w = (z->img_comp[n].x+7) >> 3;
+         int h = (z->img_comp[n].y+7) >> 3;
+         for (j=0; j < h; ++j) {
+            for (i=0; i < w; ++i) {
+               short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+               if (z->spec_start == 0) {
+                  if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+                     return 0;
+               } else {
+                  int ha = z->img_comp[n].ha;
+                  if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha]))
+                     return 0;
+               }
+               // every data block is an MCU, so countdown the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      } else { // interleaved
+         int i,j,k,x,y;
+         for (j=0; j < z->img_mcu_y; ++j) {
+            for (i=0; i < z->img_mcu_x; ++i) {
+               // scan an interleaved mcu... process scan_n components in order
+               for (k=0; k < z->scan_n; ++k) {
+                  int n = z->order[k];
+                  // scan out an mcu's worth of this component; that's just determined
+                  // by the basic H and V specified for the component
+                  for (y=0; y < z->img_comp[n].v; ++y) {
+                     for (x=0; x < z->img_comp[n].h; ++x) {
+                        int x2 = (i*z->img_comp[n].h + x);
+                        int y2 = (j*z->img_comp[n].v + y);
+                        short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w);
+                        if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+                           return 0;
+                     }
+                  }
+               }
+               // after all interleaved components, that's an interleaved MCU,
+               // so now count down the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      }
+   }
+}
+
+static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant)
+{
+   int i;
+   for (i=0; i < 64; ++i)
+      data[i] *= dequant[i];
+}
+
+static void stbi__jpeg_finish(stbi__jpeg *z)
+{
+   if (z->progressive) {
+      // dequantize and idct the data
+      int i,j,n;
+      for (n=0; n < z->s->img_n; ++n) {
+         int w = (z->img_comp[n].x+7) >> 3;
+         int h = (z->img_comp[n].y+7) >> 3;
+         for (j=0; j < h; ++j) {
+            for (i=0; i < w; ++i) {
+               short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+               stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]);
+               z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
+            }
+         }
+      }
+   }
+}
+
+static int stbi__process_marker(stbi__jpeg *z, int m)
+{
+   int L;
+   switch (m) {
+      case STBI__MARKER_none: // no marker found
+         return stbi__err("expected marker","Corrupt JPEG");
+
+      case 0xDD: // DRI - specify restart interval
+         if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG");
+         z->restart_interval = stbi__get16be(z->s);
+         return 1;
+
+      case 0xDB: // DQT - define quantization table
+         L = stbi__get16be(z->s)-2;
+         while (L > 0) {
+            int q = stbi__get8(z->s);
+            int p = q >> 4, sixteen = (p != 0);
+            int t = q & 15,i;
+            if (p != 0 && p != 1) return stbi__err("bad DQT type","Corrupt JPEG");
+            if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG");
+
+            for (i=0; i < 64; ++i)
+               z->dequant[t][stbi__jpeg_dezigzag[i]] = (stbi__uint16)(sixteen ? stbi__get16be(z->s) : stbi__get8(z->s));
+            L -= (sixteen ? 129 : 65);
+         }
+         return L==0;
+
+      case 0xC4: // DHT - define huffman table
+         L = stbi__get16be(z->s)-2;
+         while (L > 0) {
+            stbi_uc *v;
+            int sizes[16],i,n=0;
+            int q = stbi__get8(z->s);
+            int tc = q >> 4;
+            int th = q & 15;
+            if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG");
+            for (i=0; i < 16; ++i) {
+               sizes[i] = stbi__get8(z->s);
+               n += sizes[i];
+            }
+            L -= 17;
+            if (tc == 0) {
+               if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0;
+               v = z->huff_dc[th].values;
+            } else {
+               if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0;
+               v = z->huff_ac[th].values;
+            }
+            for (i=0; i < n; ++i)
+               v[i] = stbi__get8(z->s);
+            if (tc != 0)
+               stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th);
+            L -= n;
+         }
+         return L==0;
+   }
+
+   // check for comment block or APP blocks
+   if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
+      L = stbi__get16be(z->s);
+      if (L < 2) {
+         if (m == 0xFE)
+            return stbi__err("bad COM len","Corrupt JPEG");
+         else
+            return stbi__err("bad APP len","Corrupt JPEG");
+      }
+      L -= 2;
+
+      if (m == 0xE0 && L >= 5) { // JFIF APP0 segment
+         static const unsigned char tag[5] = {'J','F','I','F','\0'};
+         int ok = 1;
+         int i;
+         for (i=0; i < 5; ++i)
+            if (stbi__get8(z->s) != tag[i])
+               ok = 0;
+         L -= 5;
+         if (ok)
+            z->jfif = 1;
+      } else if (m == 0xEE && L >= 12) { // Adobe APP14 segment
+         static const unsigned char tag[6] = {'A','d','o','b','e','\0'};
+         int ok = 1;
+         int i;
+         for (i=0; i < 6; ++i)
+            if (stbi__get8(z->s) != tag[i])
+               ok = 0;
+         L -= 6;
+         if (ok) {
+            stbi__get8(z->s); // version
+            stbi__get16be(z->s); // flags0
+            stbi__get16be(z->s); // flags1
+            z->app14_color_transform = stbi__get8(z->s); // color transform
+            L -= 6;
+         }
+      }
+
+      stbi__skip(z->s, L);
+      return 1;
+   }
+
+   return stbi__err("unknown marker","Corrupt JPEG");
+}
+
+// after we see SOS
+static int stbi__process_scan_header(stbi__jpeg *z)
+{
+   int i;
+   int Ls = stbi__get16be(z->s);
+   z->scan_n = stbi__get8(z->s);
+   if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG");
+   if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG");
+   for (i=0; i < z->scan_n; ++i) {
+      int id = stbi__get8(z->s), which;
+      int q = stbi__get8(z->s);
+      for (which = 0; which < z->s->img_n; ++which)
+         if (z->img_comp[which].id == id)
+            break;
+      if (which == z->s->img_n) return 0; // no match
+      z->img_comp[which].hd = q >> 4;   if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG");
+      z->img_comp[which].ha = q & 15;   if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG");
+      z->order[i] = which;
+   }
+
+   {
+      int aa;
+      z->spec_start = stbi__get8(z->s);
+      z->spec_end   = stbi__get8(z->s); // should be 63, but might be 0
+      aa = stbi__get8(z->s);
+      z->succ_high = (aa >> 4);
+      z->succ_low  = (aa & 15);
+      if (z->progressive) {
+         if (z->spec_start > 63 || z->spec_end > 63  || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13)
+            return stbi__err("bad SOS", "Corrupt JPEG");
+      } else {
+         if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG");
+         if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG");
+         z->spec_end = 63;
+      }
+   }
+
+   return 1;
+}
+
+static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why)
+{
+   int i;
+   for (i=0; i < ncomp; ++i) {
+      if (z->img_comp[i].raw_data) {
+         STBI_FREE(z->img_comp[i].raw_data);
+         z->img_comp[i].raw_data = NULL;
+         z->img_comp[i].data = NULL;
+      }
+      if (z->img_comp[i].raw_coeff) {
+         STBI_FREE(z->img_comp[i].raw_coeff);
+         z->img_comp[i].raw_coeff = 0;
+         z->img_comp[i].coeff = 0;
+      }
+      if (z->img_comp[i].linebuf) {
+         STBI_FREE(z->img_comp[i].linebuf);
+         z->img_comp[i].linebuf = NULL;
+      }
+   }
+   return why;
+}
+
+static int stbi__process_frame_header(stbi__jpeg *z, int scan)
+{
+   stbi__context *s = z->s;
+   int Lf,p,i,q, h_max=1,v_max=1,c;
+   Lf = stbi__get16be(s);         if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG
+   p  = stbi__get8(s);            if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
+   s->img_y = stbi__get16be(s);   if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
+   s->img_x = stbi__get16be(s);   if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires
+   c = stbi__get8(s);
+   if (c != 3 && c != 1 && c != 4) return stbi__err("bad component count","Corrupt JPEG");
+   s->img_n = c;
+   for (i=0; i < c; ++i) {
+      z->img_comp[i].data = NULL;
+      z->img_comp[i].linebuf = NULL;
+   }
+
+   if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG");
+
+   z->rgb = 0;
+   for (i=0; i < s->img_n; ++i) {
+      static const unsigned char rgb[3] = { 'R', 'G', 'B' };
+      z->img_comp[i].id = stbi__get8(s);
+      if (s->img_n == 3 && z->img_comp[i].id == rgb[i])
+         ++z->rgb;
+      q = stbi__get8(s);
+      z->img_comp[i].h = (q >> 4);  if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG");
+      z->img_comp[i].v = q & 15;    if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG");
+      z->img_comp[i].tq = stbi__get8(s);  if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG");
+   }
+
+   if (scan != STBI__SCAN_load) return 1;
+
+   if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0)) return stbi__err("too large", "Image too large to decode");
+
+   for (i=0; i < s->img_n; ++i) {
+      if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
+      if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
+   }
+
+   // compute interleaved mcu info
+   z->img_h_max = h_max;
+   z->img_v_max = v_max;
+   z->img_mcu_w = h_max * 8;
+   z->img_mcu_h = v_max * 8;
+   // these sizes can't be more than 17 bits
+   z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w;
+   z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h;
+
+   for (i=0; i < s->img_n; ++i) {
+      // number of effective pixels (e.g. for non-interleaved MCU)
+      z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max;
+      z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max;
+      // to simplify generation, we'll allocate enough memory to decode
+      // the bogus oversized data from using interleaved MCUs and their
+      // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
+      // discard the extra data until colorspace conversion
+      //
+      // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier)
+      // so these muls can't overflow with 32-bit ints (which we require)
+      z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
+      z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
+      z->img_comp[i].coeff = 0;
+      z->img_comp[i].raw_coeff = 0;
+      z->img_comp[i].linebuf = NULL;
+      z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15);
+      if (z->img_comp[i].raw_data == NULL)
+         return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory"));
+      // align blocks for idct using mmx/sse
+      z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15);
+      if (z->progressive) {
+         // w2, h2 are multiples of 8 (see above)
+         z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8;
+         z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8;
+         z->img_comp[i].raw_coeff = stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15);
+         if (z->img_comp[i].raw_coeff == NULL)
+            return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory"));
+         z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15);
+      }
+   }
+
+   return 1;
+}
+
+// use comparisons since in some cases we handle more than one case (e.g. SOF)
+#define stbi__DNL(x)         ((x) == 0xdc)
+#define stbi__SOI(x)         ((x) == 0xd8)
+#define stbi__EOI(x)         ((x) == 0xd9)
+#define stbi__SOF(x)         ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2)
+#define stbi__SOS(x)         ((x) == 0xda)
+
+#define stbi__SOF_progressive(x)   ((x) == 0xc2)
+
+static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
+{
+   int m;
+   z->jfif = 0;
+   z->app14_color_transform = -1; // valid values are 0,1,2
+   z->marker = STBI__MARKER_none; // initialize cached marker to empty
+   m = stbi__get_marker(z);
+   if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG");
+   if (scan == STBI__SCAN_type) return 1;
+   m = stbi__get_marker(z);
+   while (!stbi__SOF(m)) {
+      if (!stbi__process_marker(z,m)) return 0;
+      m = stbi__get_marker(z);
+      while (m == STBI__MARKER_none) {
+         // some files have extra padding after their blocks, so ok, we'll scan
+         if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG");
+         m = stbi__get_marker(z);
+      }
+   }
+   z->progressive = stbi__SOF_progressive(m);
+   if (!stbi__process_frame_header(z, scan)) return 0;
+   return 1;
+}
+
+// decode image to YCbCr format
+static int stbi__decode_jpeg_image(stbi__jpeg *j)
+{
+   int m;
+   for (m = 0; m < 4; m++) {
+      j->img_comp[m].raw_data = NULL;
+      j->img_comp[m].raw_coeff = NULL;
+   }
+   j->restart_interval = 0;
+   if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0;
+   m = stbi__get_marker(j);
+   while (!stbi__EOI(m)) {
+      if (stbi__SOS(m)) {
+         if (!stbi__process_scan_header(j)) return 0;
+         if (!stbi__parse_entropy_coded_data(j)) return 0;
+         if (j->marker == STBI__MARKER_none ) {
+            // handle 0s at the end of image data from IP Kamera 9060
+            while (!stbi__at_eof(j->s)) {
+               int x = stbi__get8(j->s);
+               if (x == 255) {
+                  j->marker = stbi__get8(j->s);
+                  break;
+               }
+            }
+            // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0
+         }
+      } else if (stbi__DNL(m)) {
+         int Ld = stbi__get16be(j->s);
+         stbi__uint32 NL = stbi__get16be(j->s);
+         if (Ld != 4) return stbi__err("bad DNL len", "Corrupt JPEG");
+         if (NL != j->s->img_y) return stbi__err("bad DNL height", "Corrupt JPEG");
+      } else {
+         if (!stbi__process_marker(j, m)) return 0;
+      }
+      m = stbi__get_marker(j);
+   }
+   if (j->progressive)
+      stbi__jpeg_finish(j);
+   return 1;
+}
+
+// static jfif-centered resampling (across block boundaries)
+
+typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1,
+                                    int w, int hs);
+
+#define stbi__div4(x) ((stbi_uc) ((x) >> 2))
+
+static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   STBI_NOTUSED(out);
+   STBI_NOTUSED(in_far);
+   STBI_NOTUSED(w);
+   STBI_NOTUSED(hs);
+   return in_near;
+}
+
+static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate two samples vertically for every one in input
+   int i;
+   STBI_NOTUSED(hs);
+   for (i=0; i < w; ++i)
+      out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2);
+   return out;
+}
+
+static stbi_uc*  stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate two samples horizontally for every one in input
+   int i;
+   stbi_uc *input = in_near;
+
+   if (w == 1) {
+      // if only one sample, can't do any interpolation
+      out[0] = out[1] = input[0];
+      return out;
+   }
+
+   out[0] = input[0];
+   out[1] = stbi__div4(input[0]*3 + input[1] + 2);
+   for (i=1; i < w-1; ++i) {
+      int n = 3*input[i]+2;
+      out[i*2+0] = stbi__div4(n+input[i-1]);
+      out[i*2+1] = stbi__div4(n+input[i+1]);
+   }
+   out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2);
+   out[i*2+1] = input[w-1];
+
+   STBI_NOTUSED(in_far);
+   STBI_NOTUSED(hs);
+
+   return out;
+}
+
+#define stbi__div16(x) ((stbi_uc) ((x) >> 4))
+
+static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate 2x2 samples for every one in input
+   int i,t0,t1;
+   if (w == 1) {
+      out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
+      return out;
+   }
+
+   t1 = 3*in_near[0] + in_far[0];
+   out[0] = stbi__div4(t1+2);
+   for (i=1; i < w; ++i) {
+      t0 = t1;
+      t1 = 3*in_near[i]+in_far[i];
+      out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
+      out[i*2  ] = stbi__div16(3*t1 + t0 + 8);
+   }
+   out[w*2-1] = stbi__div4(t1+2);
+
+   STBI_NOTUSED(hs);
+
+   return out;
+}
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate 2x2 samples for every one in input
+   int i=0,t0,t1;
+
+   if (w == 1) {
+      out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
+      return out;
+   }
+
+   t1 = 3*in_near[0] + in_far[0];
+   // process groups of 8 pixels for as long as we can.
+   // note we can't handle the last pixel in a row in this loop
+   // because we need to handle the filter boundary conditions.
+   for (; i < ((w-1) & ~7); i += 8) {
+#if defined(STBI_SSE2)
+      // load and perform the vertical filtering pass
+      // this uses 3*x + y = 4*x + (y - x)
+      __m128i zero  = _mm_setzero_si128();
+      __m128i farb  = _mm_loadl_epi64((__m128i *) (in_far + i));
+      __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i));
+      __m128i farw  = _mm_unpacklo_epi8(farb, zero);
+      __m128i nearw = _mm_unpacklo_epi8(nearb, zero);
+      __m128i diff  = _mm_sub_epi16(farw, nearw);
+      __m128i nears = _mm_slli_epi16(nearw, 2);
+      __m128i curr  = _mm_add_epi16(nears, diff); // current row
+
+      // horizontal filter works the same based on shifted vers of current
+      // row. "prev" is current row shifted right by 1 pixel; we need to
+      // insert the previous pixel value (from t1).
+      // "next" is current row shifted left by 1 pixel, with first pixel
+      // of next block of 8 pixels added in.
+      __m128i prv0 = _mm_slli_si128(curr, 2);
+      __m128i nxt0 = _mm_srli_si128(curr, 2);
+      __m128i prev = _mm_insert_epi16(prv0, t1, 0);
+      __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7);
+
+      // horizontal filter, polyphase implementation since it's convenient:
+      // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+      // odd  pixels = 3*cur + next = cur*4 + (next - cur)
+      // note the shared term.
+      __m128i bias  = _mm_set1_epi16(8);
+      __m128i curs = _mm_slli_epi16(curr, 2);
+      __m128i prvd = _mm_sub_epi16(prev, curr);
+      __m128i nxtd = _mm_sub_epi16(next, curr);
+      __m128i curb = _mm_add_epi16(curs, bias);
+      __m128i even = _mm_add_epi16(prvd, curb);
+      __m128i odd  = _mm_add_epi16(nxtd, curb);
+
+      // interleave even and odd pixels, then undo scaling.
+      __m128i int0 = _mm_unpacklo_epi16(even, odd);
+      __m128i int1 = _mm_unpackhi_epi16(even, odd);
+      __m128i de0  = _mm_srli_epi16(int0, 4);
+      __m128i de1  = _mm_srli_epi16(int1, 4);
+
+      // pack and write output
+      __m128i outv = _mm_packus_epi16(de0, de1);
+      _mm_storeu_si128((__m128i *) (out + i*2), outv);
+#elif defined(STBI_NEON)
+      // load and perform the vertical filtering pass
+      // this uses 3*x + y = 4*x + (y - x)
+      uint8x8_t farb  = vld1_u8(in_far + i);
+      uint8x8_t nearb = vld1_u8(in_near + i);
+      int16x8_t diff  = vreinterpretq_s16_u16(vsubl_u8(farb, nearb));
+      int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2));
+      int16x8_t curr  = vaddq_s16(nears, diff); // current row
+
+      // horizontal filter works the same based on shifted vers of current
+      // row. "prev" is current row shifted right by 1 pixel; we need to
+      // insert the previous pixel value (from t1).
+      // "next" is current row shifted left by 1 pixel, with first pixel
+      // of next block of 8 pixels added in.
+      int16x8_t prv0 = vextq_s16(curr, curr, 7);
+      int16x8_t nxt0 = vextq_s16(curr, curr, 1);
+      int16x8_t prev = vsetq_lane_s16(t1, prv0, 0);
+      int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7);
+
+      // horizontal filter, polyphase implementation since it's convenient:
+      // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+      // odd  pixels = 3*cur + next = cur*4 + (next - cur)
+      // note the shared term.
+      int16x8_t curs = vshlq_n_s16(curr, 2);
+      int16x8_t prvd = vsubq_s16(prev, curr);
+      int16x8_t nxtd = vsubq_s16(next, curr);
+      int16x8_t even = vaddq_s16(curs, prvd);
+      int16x8_t odd  = vaddq_s16(curs, nxtd);
+
+      // undo scaling and round, then store with even/odd phases interleaved
+      uint8x8x2_t o;
+      o.val[0] = vqrshrun_n_s16(even, 4);
+      o.val[1] = vqrshrun_n_s16(odd,  4);
+      vst2_u8(out + i*2, o);
+#endif
+
+      // "previous" value for next iter
+      t1 = 3*in_near[i+7] + in_far[i+7];
+   }
+
+   t0 = t1;
+   t1 = 3*in_near[i] + in_far[i];
+   out[i*2] = stbi__div16(3*t1 + t0 + 8);
+
+   for (++i; i < w; ++i) {
+      t0 = t1;
+      t1 = 3*in_near[i]+in_far[i];
+      out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
+      out[i*2  ] = stbi__div16(3*t1 + t0 + 8);
+   }
+   out[w*2-1] = stbi__div4(t1+2);
+
+   STBI_NOTUSED(hs);
+
+   return out;
+}
+#endif
+
+static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // resample with nearest-neighbor
+   int i,j;
+   STBI_NOTUSED(in_far);
+   for (i=0; i < w; ++i)
+      for (j=0; j < hs; ++j)
+         out[i*hs+j] = in_near[i];
+   return out;
+}
+
+// this is a reduced-precision calculation of YCbCr-to-RGB introduced
+// to make sure the code produces the same results in both SIMD and scalar
+#define stbi__float2fixed(x)  (((int) ((x) * 4096.0f + 0.5f)) << 8)
+static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step)
+{
+   int i;
+   for (i=0; i < count; ++i) {
+      int y_fixed = (y[i] << 20) + (1<<19); // rounding
+      int r,g,b;
+      int cr = pcr[i] - 128;
+      int cb = pcb[i] - 128;
+      r = y_fixed +  cr* stbi__float2fixed(1.40200f);
+      g = y_fixed + (cr*-stbi__float2fixed(0.71414f)) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000);
+      b = y_fixed                                     +   cb* stbi__float2fixed(1.77200f);
+      r >>= 20;
+      g >>= 20;
+      b >>= 20;
+      if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+      if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+      if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+      out[0] = (stbi_uc)r;
+      out[1] = (stbi_uc)g;
+      out[2] = (stbi_uc)b;
+      out[3] = 255;
+      out += step;
+   }
+}
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step)
+{
+   int i = 0;
+
+#ifdef STBI_SSE2
+   // step == 3 is pretty ugly on the final interleave, and i'm not convinced
+   // it's useful in practice (you wouldn't use it for textures, for example).
+   // so just accelerate step == 4 case.
+   if (step == 4) {
+      // this is a fairly straightforward implementation and not super-optimized.
+      __m128i signflip  = _mm_set1_epi8(-0x80);
+      __m128i cr_const0 = _mm_set1_epi16(   (short) ( 1.40200f*4096.0f+0.5f));
+      __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f));
+      __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f));
+      __m128i cb_const1 = _mm_set1_epi16(   (short) ( 1.77200f*4096.0f+0.5f));
+      __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128);
+      __m128i xw = _mm_set1_epi16(255); // alpha channel
+
+      for (; i+7 < count; i += 8) {
+         // load
+         __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i));
+         __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i));
+         __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i));
+         __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128
+         __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128
+
+         // unpack to short (and left-shift cr, cb by 8)
+         __m128i yw  = _mm_unpacklo_epi8(y_bias, y_bytes);
+         __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased);
+         __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased);
+
+         // color transform
+         __m128i yws = _mm_srli_epi16(yw, 4);
+         __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw);
+         __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw);
+         __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1);
+         __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1);
+         __m128i rws = _mm_add_epi16(cr0, yws);
+         __m128i gwt = _mm_add_epi16(cb0, yws);
+         __m128i bws = _mm_add_epi16(yws, cb1);
+         __m128i gws = _mm_add_epi16(gwt, cr1);
+
+         // descale
+         __m128i rw = _mm_srai_epi16(rws, 4);
+         __m128i bw = _mm_srai_epi16(bws, 4);
+         __m128i gw = _mm_srai_epi16(gws, 4);
+
+         // back to byte, set up for transpose
+         __m128i brb = _mm_packus_epi16(rw, bw);
+         __m128i gxb = _mm_packus_epi16(gw, xw);
+
+         // transpose to interleave channels
+         __m128i t0 = _mm_unpacklo_epi8(brb, gxb);
+         __m128i t1 = _mm_unpackhi_epi8(brb, gxb);
+         __m128i o0 = _mm_unpacklo_epi16(t0, t1);
+         __m128i o1 = _mm_unpackhi_epi16(t0, t1);
+
+         // store
+         _mm_storeu_si128((__m128i *) (out + 0), o0);
+         _mm_storeu_si128((__m128i *) (out + 16), o1);
+         out += 32;
+      }
+   }
+#endif
+
+#ifdef STBI_NEON
+   // in this version, step=3 support would be easy to add. but is there demand?
+   if (step == 4) {
+      // this is a fairly straightforward implementation and not super-optimized.
+      uint8x8_t signflip = vdup_n_u8(0x80);
+      int16x8_t cr_const0 = vdupq_n_s16(   (short) ( 1.40200f*4096.0f+0.5f));
+      int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f));
+      int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f));
+      int16x8_t cb_const1 = vdupq_n_s16(   (short) ( 1.77200f*4096.0f+0.5f));
+
+      for (; i+7 < count; i += 8) {
+         // load
+         uint8x8_t y_bytes  = vld1_u8(y + i);
+         uint8x8_t cr_bytes = vld1_u8(pcr + i);
+         uint8x8_t cb_bytes = vld1_u8(pcb + i);
+         int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip));
+         int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip));
+
+         // expand to s16
+         int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4));
+         int16x8_t crw = vshll_n_s8(cr_biased, 7);
+         int16x8_t cbw = vshll_n_s8(cb_biased, 7);
+
+         // color transform
+         int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0);
+         int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0);
+         int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1);
+         int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1);
+         int16x8_t rws = vaddq_s16(yws, cr0);
+         int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1);
+         int16x8_t bws = vaddq_s16(yws, cb1);
+
+         // undo scaling, round, convert to byte
+         uint8x8x4_t o;
+         o.val[0] = vqrshrun_n_s16(rws, 4);
+         o.val[1] = vqrshrun_n_s16(gws, 4);
+         o.val[2] = vqrshrun_n_s16(bws, 4);
+         o.val[3] = vdup_n_u8(255);
+
+         // store, interleaving r/g/b/a
+         vst4_u8(out, o);
+         out += 8*4;
+      }
+   }
+#endif
+
+   for (; i < count; ++i) {
+      int y_fixed = (y[i] << 20) + (1<<19); // rounding
+      int r,g,b;
+      int cr = pcr[i] - 128;
+      int cb = pcb[i] - 128;
+      r = y_fixed + cr* stbi__float2fixed(1.40200f);
+      g = y_fixed + cr*-stbi__float2fixed(0.71414f) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000);
+      b = y_fixed                                   +   cb* stbi__float2fixed(1.77200f);
+      r >>= 20;
+      g >>= 20;
+      b >>= 20;
+      if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+      if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+      if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+      out[0] = (stbi_uc)r;
+      out[1] = (stbi_uc)g;
+      out[2] = (stbi_uc)b;
+      out[3] = 255;
+      out += step;
+   }
+}
+#endif
+
+// set up the kernels
+static void stbi__setup_jpeg(stbi__jpeg *j)
+{
+   j->idct_block_kernel = stbi__idct_block;
+   j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row;
+   j->resample_row_hv_2_kernel = stbi__resample_row_hv_2;
+
+#ifdef STBI_SSE2
+   if (stbi__sse2_available()) {
+      j->idct_block_kernel = stbi__idct_simd;
+      j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+      j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+   }
+#endif
+
+#ifdef STBI_NEON
+   j->idct_block_kernel = stbi__idct_simd;
+   j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+   j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+#endif
+}
+
+// clean up the temporary component buffers
+static void stbi__cleanup_jpeg(stbi__jpeg *j)
+{
+   stbi__free_jpeg_components(j, j->s->img_n, 0);
+}
+
+typedef struct
+{
+   resample_row_func resample;
+   stbi_uc *line0,*line1;
+   int hs,vs;   // expansion factor in each axis
+   int w_lores; // horizontal pixels pre-expansion
+   int ystep;   // how far through vertical expansion we are
+   int ypos;    // which pre-expansion row we're on
+} stbi__resample;
+
+// fast 0..255 * 0..255 => 0..255 rounded multiplication
+static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y)
+{
+   unsigned int t = x*y + 128;
+   return (stbi_uc) ((t + (t >>8)) >> 8);
+}
+
+static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
+{
+   int n, decode_n, is_rgb;
+   z->s->img_n = 0; // make stbi__cleanup_jpeg safe
+
+   // validate req_comp
+   if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+
+   // load a jpeg image from whichever source, but leave in YCbCr format
+   if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; }
+
+   // determine actual number of components to generate
+   n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1;
+
+   is_rgb = z->s->img_n == 3 && (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif));
+
+   if (z->s->img_n == 3 && n < 3 && !is_rgb)
+      decode_n = 1;
+   else
+      decode_n = z->s->img_n;
+
+   // resample and color-convert
+   {
+      int k;
+      unsigned int i,j;
+      stbi_uc *output;
+      stbi_uc *coutput[4] = { NULL, NULL, NULL, NULL };
+
+      stbi__resample res_comp[4];
+
+      for (k=0; k < decode_n; ++k) {
+         stbi__resample *r = &res_comp[k];
+
+         // allocate line buffer big enough for upsampling off the edges
+         // with upsample factor of 4
+         z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3);
+         if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
+
+         r->hs      = z->img_h_max / z->img_comp[k].h;
+         r->vs      = z->img_v_max / z->img_comp[k].v;
+         r->ystep   = r->vs >> 1;
+         r->w_lores = (z->s->img_x + r->hs-1) / r->hs;
+         r->ypos    = 0;
+         r->line0   = r->line1 = z->img_comp[k].data;
+
+         if      (r->hs == 1 && r->vs == 1) r->resample = resample_row_1;
+         else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2;
+         else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2;
+         else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel;
+         else                               r->resample = stbi__resample_row_generic;
+      }
+
+      // can't error after this so, this is safe
+      output = (stbi_uc *) stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1);
+      if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
+
+      // now go ahead and resample
+      for (j=0; j < z->s->img_y; ++j) {
+         stbi_uc *out = output + n * z->s->img_x * j;
+         for (k=0; k < decode_n; ++k) {
+            stbi__resample *r = &res_comp[k];
+            int y_bot = r->ystep >= (r->vs >> 1);
+            coutput[k] = r->resample(z->img_comp[k].linebuf,
+                                     y_bot ? r->line1 : r->line0,
+                                     y_bot ? r->line0 : r->line1,
+                                     r->w_lores, r->hs);
+            if (++r->ystep >= r->vs) {
+               r->ystep = 0;
+               r->line0 = r->line1;
+               if (++r->ypos < z->img_comp[k].y)
+                  r->line1 += z->img_comp[k].w2;
+            }
+         }
+         if (n >= 3) {
+            stbi_uc *y = coutput[0];
+            if (z->s->img_n == 3) {
+               if (is_rgb) {
+                  for (i=0; i < z->s->img_x; ++i) {
+                     out[0] = y[i];
+                     out[1] = coutput[1][i];
+                     out[2] = coutput[2][i];
+                     out[3] = 255;
+                     out += n;
+                  }
+               } else {
+                  z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+               }
+            } else if (z->s->img_n == 4) {
+               if (z->app14_color_transform == 0) { // CMYK
+                  for (i=0; i < z->s->img_x; ++i) {
+                     stbi_uc m = coutput[3][i];
+                     out[0] = stbi__blinn_8x8(coutput[0][i], m);
+                     out[1] = stbi__blinn_8x8(coutput[1][i], m);
+                     out[2] = stbi__blinn_8x8(coutput[2][i], m);
+                     out[3] = 255;
+                     out += n;
+                  }
+               } else if (z->app14_color_transform == 2) { // YCCK
+                  z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+                  for (i=0; i < z->s->img_x; ++i) {
+                     stbi_uc m = coutput[3][i];
+                     out[0] = stbi__blinn_8x8(255 - out[0], m);
+                     out[1] = stbi__blinn_8x8(255 - out[1], m);
+                     out[2] = stbi__blinn_8x8(255 - out[2], m);
+                     out += n;
+                  }
+               } else { // YCbCr + alpha?  Ignore the fourth channel for now
+                  z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+               }
+            } else
+               for (i=0; i < z->s->img_x; ++i) {
+                  out[0] = out[1] = out[2] = y[i];
+                  out[3] = 255; // not used if n==3
+                  out += n;
+               }
+         } else {
+            if (is_rgb) {
+               if (n == 1)
+                  for (i=0; i < z->s->img_x; ++i)
+                     *out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
+               else {
+                  for (i=0; i < z->s->img_x; ++i, out += 2) {
+                     out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
+                     out[1] = 255;
+                  }
+               }
+            } else if (z->s->img_n == 4 && z->app14_color_transform == 0) {
+               for (i=0; i < z->s->img_x; ++i) {
+                  stbi_uc m = coutput[3][i];
+                  stbi_uc r = stbi__blinn_8x8(coutput[0][i], m);
+                  stbi_uc g = stbi__blinn_8x8(coutput[1][i], m);
+                  stbi_uc b = stbi__blinn_8x8(coutput[2][i], m);
+                  out[0] = stbi__compute_y(r, g, b);
+                  out[1] = 255;
+                  out += n;
+               }
+            } else if (z->s->img_n == 4 && z->app14_color_transform == 2) {
+               for (i=0; i < z->s->img_x; ++i) {
+                  out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]);
+                  out[1] = 255;
+                  out += n;
+               }
+            } else {
+               stbi_uc *y = coutput[0];
+               if (n == 1)
+                  for (i=0; i < z->s->img_x; ++i) out[i] = y[i];
+               else
+                  for (i=0; i < z->s->img_x; ++i) { *out++ = y[i]; *out++ = 255; }
+            }
+         }
+      }
+      stbi__cleanup_jpeg(z);
+      *out_x = z->s->img_x;
+      *out_y = z->s->img_y;
+      if (comp) *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output
+      return output;
+   }
+}
+
+static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   unsigned char* result;
+   stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg));
+   STBI_NOTUSED(ri);
+   j->s = s;
+   stbi__setup_jpeg(j);
+   result = load_jpeg_image(j, x,y,comp,req_comp);
+   STBI_FREE(j);
+   return result;
+}
+
+static int stbi__jpeg_test(stbi__context *s)
+{
+   int r;
+   stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg));
+   j->s = s;
+   stbi__setup_jpeg(j);
+   r = stbi__decode_jpeg_header(j, STBI__SCAN_type);
+   stbi__rewind(s);
+   STBI_FREE(j);
+   return r;
+}
+
+static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp)
+{
+   if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) {
+      stbi__rewind( j->s );
+      return 0;
+   }
+   if (x) *x = j->s->img_x;
+   if (y) *y = j->s->img_y;
+   if (comp) *comp = j->s->img_n >= 3 ? 3 : 1;
+   return 1;
+}
+
+static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int result;
+   stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg)));
+   j->s = s;
+   result = stbi__jpeg_info_raw(j, x, y, comp);
+   STBI_FREE(j);
+   return result;
+}
+#endif
+
+// public domain zlib decode    v0.2  Sean Barrett 2006-11-18
+//    simple implementation
+//      - all input must be provided in an upfront buffer
+//      - all output is written to a single output buffer (can malloc/realloc)
+//    performance
+//      - fast huffman
+
+#ifndef STBI_NO_ZLIB
+
+// fast-way is faster to check than jpeg huffman, but slow way is slower
+#define STBI__ZFAST_BITS  9 // accelerate all cases in default tables
+#define STBI__ZFAST_MASK  ((1 << STBI__ZFAST_BITS) - 1)
+
+// zlib-style huffman encoding
+// (jpegs packs from left, zlib from right, so can't share code)
+typedef struct
+{
+   stbi__uint16 fast[1 << STBI__ZFAST_BITS];
+   stbi__uint16 firstcode[16];
+   int maxcode[17];
+   stbi__uint16 firstsymbol[16];
+   stbi_uc  size[288];
+   stbi__uint16 value[288];
+} stbi__zhuffman;
+
+stbi_inline static int stbi__bitreverse16(int n)
+{
+  n = ((n & 0xAAAA) >>  1) | ((n & 0x5555) << 1);
+  n = ((n & 0xCCCC) >>  2) | ((n & 0x3333) << 2);
+  n = ((n & 0xF0F0) >>  4) | ((n & 0x0F0F) << 4);
+  n = ((n & 0xFF00) >>  8) | ((n & 0x00FF) << 8);
+  return n;
+}
+
+stbi_inline static int stbi__bit_reverse(int v, int bits)
+{
+   STBI_ASSERT(bits <= 16);
+   // to bit reverse n bits, reverse 16 and shift
+   // e.g. 11 bits, bit reverse and shift away 5
+   return stbi__bitreverse16(v) >> (16-bits);
+}
+
+static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int num)
+{
+   int i,k=0;
+   int code, next_code[16], sizes[17];
+
+   // DEFLATE spec for generating codes
+   memset(sizes, 0, sizeof(sizes));
+   memset(z->fast, 0, sizeof(z->fast));
+   for (i=0; i < num; ++i)
+      ++sizes[sizelist[i]];
+   sizes[0] = 0;
+   for (i=1; i < 16; ++i)
+      if (sizes[i] > (1 << i))
+         return stbi__err("bad sizes", "Corrupt PNG");
+   code = 0;
+   for (i=1; i < 16; ++i) {
+      next_code[i] = code;
+      z->firstcode[i] = (stbi__uint16) code;
+      z->firstsymbol[i] = (stbi__uint16) k;
+      code = (code + sizes[i]);
+      if (sizes[i])
+         if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG");
+      z->maxcode[i] = code << (16-i); // preshift for inner loop
+      code <<= 1;
+      k += sizes[i];
+   }
+   z->maxcode[16] = 0x10000; // sentinel
+   for (i=0; i < num; ++i) {
+      int s = sizelist[i];
+      if (s) {
+         int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
+         stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i);
+         z->size [c] = (stbi_uc     ) s;
+         z->value[c] = (stbi__uint16) i;
+         if (s <= STBI__ZFAST_BITS) {
+            int j = stbi__bit_reverse(next_code[s],s);
+            while (j < (1 << STBI__ZFAST_BITS)) {
+               z->fast[j] = fastv;
+               j += (1 << s);
+            }
+         }
+         ++next_code[s];
+      }
+   }
+   return 1;
+}
+
+// zlib-from-memory implementation for PNG reading
+//    because PNG allows splitting the zlib stream arbitrarily,
+//    and it's annoying structurally to have PNG call ZLIB call PNG,
+//    we require PNG read all the IDATs and combine them into a single
+//    memory buffer
+
+typedef struct
+{
+   stbi_uc *zbuffer, *zbuffer_end;
+   int num_bits;
+   stbi__uint32 code_buffer;
+
+   char *zout;
+   char *zout_start;
+   char *zout_end;
+   int   z_expandable;
+
+   stbi__zhuffman z_length, z_distance;
+} stbi__zbuf;
+
+stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z)
+{
+   if (z->zbuffer >= z->zbuffer_end) return 0;
+   return *z->zbuffer++;
+}
+
+static void stbi__fill_bits(stbi__zbuf *z)
+{
+   do {
+      STBI_ASSERT(z->code_buffer < (1U << z->num_bits));
+      z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits;
+      z->num_bits += 8;
+   } while (z->num_bits <= 24);
+}
+
+stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n)
+{
+   unsigned int k;
+   if (z->num_bits < n) stbi__fill_bits(z);
+   k = z->code_buffer & ((1 << n) - 1);
+   z->code_buffer >>= n;
+   z->num_bits -= n;
+   return k;
+}
+
+static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z)
+{
+   int b,s,k;
+   // not resolved by fast table, so compute it the slow way
+   // use jpeg approach, which requires MSbits at top
+   k = stbi__bit_reverse(a->code_buffer, 16);
+   for (s=STBI__ZFAST_BITS+1; ; ++s)
+      if (k < z->maxcode[s])
+         break;
+   if (s == 16) return -1; // invalid code!
+   // code size is s, so:
+   b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
+   STBI_ASSERT(z->size[b] == s);
+   a->code_buffer >>= s;
+   a->num_bits -= s;
+   return z->value[b];
+}
+
+stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z)
+{
+   int b,s;
+   if (a->num_bits < 16) stbi__fill_bits(a);
+   b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
+   if (b) {
+      s = b >> 9;
+      a->code_buffer >>= s;
+      a->num_bits -= s;
+      return b & 511;
+   }
+   return stbi__zhuffman_decode_slowpath(a, z);
+}
+
+static int stbi__zexpand(stbi__zbuf *z, char *zout, int n)  // need to make room for n bytes
+{
+   char *q;
+   int cur, limit, old_limit;
+   z->zout = zout;
+   if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG");
+   cur   = (int) (z->zout     - z->zout_start);
+   limit = old_limit = (int) (z->zout_end - z->zout_start);
+   while (cur + n > limit)
+      limit *= 2;
+   q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit);
+   STBI_NOTUSED(old_limit);
+   if (q == NULL) return stbi__err("outofmem", "Out of memory");
+   z->zout_start = q;
+   z->zout       = q + cur;
+   z->zout_end   = q + limit;
+   return 1;
+}
+
+static const int stbi__zlength_base[31] = {
+   3,4,5,6,7,8,9,10,11,13,
+   15,17,19,23,27,31,35,43,51,59,
+   67,83,99,115,131,163,195,227,258,0,0 };
+
+static const int stbi__zlength_extra[31]=
+{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
+
+static const int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
+257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
+
+static const int stbi__zdist_extra[32] =
+{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
+
+static int stbi__parse_huffman_block(stbi__zbuf *a)
+{
+   char *zout = a->zout;
+   for(;;) {
+      int z = stbi__zhuffman_decode(a, &a->z_length);
+      if (z < 256) {
+         if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes
+         if (zout >= a->zout_end) {
+            if (!stbi__zexpand(a, zout, 1)) return 0;
+            zout = a->zout;
+         }
+         *zout++ = (char) z;
+      } else {
+         stbi_uc *p;
+         int len,dist;
+         if (z == 256) {
+            a->zout = zout;
+            return 1;
+         }
+         z -= 257;
+         len = stbi__zlength_base[z];
+         if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]);
+         z = stbi__zhuffman_decode(a, &a->z_distance);
+         if (z < 0) return stbi__err("bad huffman code","Corrupt PNG");
+         dist = stbi__zdist_base[z];
+         if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]);
+         if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG");
+         if (zout + len > a->zout_end) {
+            if (!stbi__zexpand(a, zout, len)) return 0;
+            zout = a->zout;
+         }
+         p = (stbi_uc *) (zout - dist);
+         if (dist == 1) { // run of one byte; common in images.
+            stbi_uc v = *p;
+            if (len) { do *zout++ = v; while (--len); }
+         } else {
+            if (len) { do *zout++ = *p++; while (--len); }
+         }
+      }
+   }
+}
+
+static int stbi__compute_huffman_codes(stbi__zbuf *a)
+{
+   static const stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
+   stbi__zhuffman z_codelength;
+   stbi_uc lencodes[286+32+137];//padding for maximum single op
+   stbi_uc codelength_sizes[19];
+   int i,n;
+
+   int hlit  = stbi__zreceive(a,5) + 257;
+   int hdist = stbi__zreceive(a,5) + 1;
+   int hclen = stbi__zreceive(a,4) + 4;
+   int ntot  = hlit + hdist;
+
+   memset(codelength_sizes, 0, sizeof(codelength_sizes));
+   for (i=0; i < hclen; ++i) {
+      int s = stbi__zreceive(a,3);
+      codelength_sizes[length_dezigzag[i]] = (stbi_uc) s;
+   }
+   if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
+
+   n = 0;
+   while (n < ntot) {
+      int c = stbi__zhuffman_decode(a, &z_codelength);
+      if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG");
+      if (c < 16)
+         lencodes[n++] = (stbi_uc) c;
+      else {
+         stbi_uc fill = 0;
+         if (c == 16) {
+            c = stbi__zreceive(a,2)+3;
+            if (n == 0) return stbi__err("bad codelengths", "Corrupt PNG");
+            fill = lencodes[n-1];
+         } else if (c == 17)
+            c = stbi__zreceive(a,3)+3;
+         else {
+            STBI_ASSERT(c == 18);
+            c = stbi__zreceive(a,7)+11;
+         }
+         if (ntot - n < c) return stbi__err("bad codelengths", "Corrupt PNG");
+         memset(lencodes+n, fill, c);
+         n += c;
+      }
+   }
+   if (n != ntot) return stbi__err("bad codelengths","Corrupt PNG");
+   if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
+   if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
+   return 1;
+}
+
+static int stbi__parse_uncompressed_block(stbi__zbuf *a)
+{
+   stbi_uc header[4];
+   int len,nlen,k;
+   if (a->num_bits & 7)
+      stbi__zreceive(a, a->num_bits & 7); // discard
+   // drain the bit-packed data into header
+   k = 0;
+   while (a->num_bits > 0) {
+      header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check
+      a->code_buffer >>= 8;
+      a->num_bits -= 8;
+   }
+   STBI_ASSERT(a->num_bits == 0);
+   // now fill header the normal way
+   while (k < 4)
+      header[k++] = stbi__zget8(a);
+   len  = header[1] * 256 + header[0];
+   nlen = header[3] * 256 + header[2];
+   if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG");
+   if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG");
+   if (a->zout + len > a->zout_end)
+      if (!stbi__zexpand(a, a->zout, len)) return 0;
+   memcpy(a->zout, a->zbuffer, len);
+   a->zbuffer += len;
+   a->zout += len;
+   return 1;
+}
+
+static int stbi__parse_zlib_header(stbi__zbuf *a)
+{
+   int cmf   = stbi__zget8(a);
+   int cm    = cmf & 15;
+   /* int cinfo = cmf >> 4; */
+   int flg   = stbi__zget8(a);
+   if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec
+   if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
+   if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png
+   // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
+   return 1;
+}
+
+static const stbi_uc stbi__zdefault_length[288] =
+{
+   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
+   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
+   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
+   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
+   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
+   9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
+   9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
+   9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
+   7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8
+};
+static const stbi_uc stbi__zdefault_distance[32] =
+{
+   5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5
+};
+/*
+Init algorithm:
+{
+   int i;   // use <= to match clearly with spec
+   for (i=0; i <= 143; ++i)     stbi__zdefault_length[i]   = 8;
+   for (   ; i <= 255; ++i)     stbi__zdefault_length[i]   = 9;
+   for (   ; i <= 279; ++i)     stbi__zdefault_length[i]   = 7;
+   for (   ; i <= 287; ++i)     stbi__zdefault_length[i]   = 8;
+
+   for (i=0; i <=  31; ++i)     stbi__zdefault_distance[i] = 5;
+}
+*/
+
+static int stbi__parse_zlib(stbi__zbuf *a, int parse_header)
+{
+   int final, type;
+   if (parse_header)
+      if (!stbi__parse_zlib_header(a)) return 0;
+   a->num_bits = 0;
+   a->code_buffer = 0;
+   do {
+      final = stbi__zreceive(a,1);
+      type = stbi__zreceive(a,2);
+      if (type == 0) {
+         if (!stbi__parse_uncompressed_block(a)) return 0;
+      } else if (type == 3) {
+         return 0;
+      } else {
+         if (type == 1) {
+            // use fixed code lengths
+            if (!stbi__zbuild_huffman(&a->z_length  , stbi__zdefault_length  , 288)) return 0;
+            if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance,  32)) return 0;
+         } else {
+            if (!stbi__compute_huffman_codes(a)) return 0;
+         }
+         if (!stbi__parse_huffman_block(a)) return 0;
+      }
+   } while (!final);
+   return 1;
+}
+
+static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header)
+{
+   a->zout_start = obuf;
+   a->zout       = obuf;
+   a->zout_end   = obuf + olen;
+   a->z_expandable = exp;
+
+   return stbi__parse_zlib(a, parse_header);
+}
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
+{
+   stbi__zbuf a;
+   char *p = (char *) stbi__malloc(initial_size);
+   if (p == NULL) return NULL;
+   a.zbuffer = (stbi_uc *) buffer;
+   a.zbuffer_end = (stbi_uc *) buffer + len;
+   if (stbi__do_zlib(&a, p, initial_size, 1, 1)) {
+      if (outlen) *outlen = (int) (a.zout - a.zout_start);
+      return a.zout_start;
+   } else {
+      STBI_FREE(a.zout_start);
+      return NULL;
+   }
+}
+
+STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
+{
+   return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
+}
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header)
+{
+   stbi__zbuf a;
+   char *p = (char *) stbi__malloc(initial_size);
+   if (p == NULL) return NULL;
+   a.zbuffer = (stbi_uc *) buffer;
+   a.zbuffer_end = (stbi_uc *) buffer + len;
+   if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) {
+      if (outlen) *outlen = (int) (a.zout - a.zout_start);
+      return a.zout_start;
+   } else {
+      STBI_FREE(a.zout_start);
+      return NULL;
+   }
+}
+
+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
+{
+   stbi__zbuf a;
+   a.zbuffer = (stbi_uc *) ibuffer;
+   a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
+   if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
+      return (int) (a.zout - a.zout_start);
+   else
+      return -1;
+}
+
+STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
+{
+   stbi__zbuf a;
+   char *p = (char *) stbi__malloc(16384);
+   if (p == NULL) return NULL;
+   a.zbuffer = (stbi_uc *) buffer;
+   a.zbuffer_end = (stbi_uc *) buffer+len;
+   if (stbi__do_zlib(&a, p, 16384, 1, 0)) {
+      if (outlen) *outlen = (int) (a.zout - a.zout_start);
+      return a.zout_start;
+   } else {
+      STBI_FREE(a.zout_start);
+      return NULL;
+   }
+}
+
+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
+{
+   stbi__zbuf a;
+   a.zbuffer = (stbi_uc *) ibuffer;
+   a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
+   if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
+      return (int) (a.zout - a.zout_start);
+   else
+      return -1;
+}
+#endif
+
+// public domain "baseline" PNG decoder   v0.10  Sean Barrett 2006-11-18
+//    simple implementation
+//      - only 8-bit samples
+//      - no CRC checking
+//      - allocates lots of intermediate memory
+//        - avoids problem of streaming data between subsystems
+//        - avoids explicit window management
+//    performance
+//      - uses stb_zlib, a PD zlib implementation with fast huffman decoding
+
+#ifndef STBI_NO_PNG
+typedef struct
+{
+   stbi__uint32 length;
+   stbi__uint32 type;
+} stbi__pngchunk;
+
+static stbi__pngchunk stbi__get_chunk_header(stbi__context *s)
+{
+   stbi__pngchunk c;
+   c.length = stbi__get32be(s);
+   c.type   = stbi__get32be(s);
+   return c;
+}
+
+static int stbi__check_png_header(stbi__context *s)
+{
+   static const stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 };
+   int i;
+   for (i=0; i < 8; ++i)
+      if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG");
+   return 1;
+}
+
+typedef struct
+{
+   stbi__context *s;
+   stbi_uc *idata, *expanded, *out;
+   int depth;
+} stbi__png;
+
+
+enum {
+   STBI__F_none=0,
+   STBI__F_sub=1,
+   STBI__F_up=2,
+   STBI__F_avg=3,
+   STBI__F_paeth=4,
+   // synthetic filters used for first scanline to avoid needing a dummy row of 0s
+   STBI__F_avg_first,
+   STBI__F_paeth_first
+};
+
+static stbi_uc first_row_filter[5] =
+{
+   STBI__F_none,
+   STBI__F_sub,
+   STBI__F_none,
+   STBI__F_avg_first,
+   STBI__F_paeth_first
+};
+
+static int stbi__paeth(int a, int b, int c)
+{
+   int p = a + b - c;
+   int pa = abs(p-a);
+   int pb = abs(p-b);
+   int pc = abs(p-c);
+   if (pa <= pb && pa <= pc) return a;
+   if (pb <= pc) return b;
+   return c;
+}
+
+static const stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 };
+
+// create the png data from post-deflated data
+static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color)
+{
+   int bytes = (depth == 16? 2 : 1);
+   stbi__context *s = a->s;
+   stbi__uint32 i,j,stride = x*out_n*bytes;
+   stbi__uint32 img_len, img_width_bytes;
+   int k;
+   int img_n = s->img_n; // copy it into a local for later
+
+   int output_bytes = out_n*bytes;
+   int filter_bytes = img_n*bytes;
+   int width = x;
+
+   STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1);
+   a->out = (stbi_uc *) stbi__malloc_mad3(x, y, output_bytes, 0); // extra bytes to write off the end into
+   if (!a->out) return stbi__err("outofmem", "Out of memory");
+
+   if (!stbi__mad3sizes_valid(img_n, x, depth, 7)) return stbi__err("too large", "Corrupt PNG");
+   img_width_bytes = (((img_n * x * depth) + 7) >> 3);
+   img_len = (img_width_bytes + 1) * y;
+
+   // we used to check for exact match between raw_len and img_len on non-interlaced PNGs,
+   // but issue #276 reported a PNG in the wild that had extra data at the end (all zeros),
+   // so just check for raw_len < img_len always.
+   if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG");
+
+   for (j=0; j < y; ++j) {
+      stbi_uc *cur = a->out + stride*j;
+      stbi_uc *prior;
+      int filter = *raw++;
+
+      if (filter > 4)
+         return stbi__err("invalid filter","Corrupt PNG");
+
+      if (depth < 8) {
+         STBI_ASSERT(img_width_bytes <= x);
+         cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place
+         filter_bytes = 1;
+         width = img_width_bytes;
+      }
+      prior = cur - stride; // bugfix: need to compute this after 'cur +=' computation above
+
+      // if first row, use special filter that doesn't sample previous row
+      if (j == 0) filter = first_row_filter[filter];
+
+      // handle first byte explicitly
+      for (k=0; k < filter_bytes; ++k) {
+         switch (filter) {
+            case STBI__F_none       : cur[k] = raw[k]; break;
+            case STBI__F_sub        : cur[k] = raw[k]; break;
+            case STBI__F_up         : cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break;
+            case STBI__F_avg        : cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); break;
+            case STBI__F_paeth      : cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0,prior[k],0)); break;
+            case STBI__F_avg_first  : cur[k] = raw[k]; break;
+            case STBI__F_paeth_first: cur[k] = raw[k]; break;
+         }
+      }
+
+      if (depth == 8) {
+         if (img_n != out_n)
+            cur[img_n] = 255; // first pixel
+         raw += img_n;
+         cur += out_n;
+         prior += out_n;
+      } else if (depth == 16) {
+         if (img_n != out_n) {
+            cur[filter_bytes]   = 255; // first pixel top byte
+            cur[filter_bytes+1] = 255; // first pixel bottom byte
+         }
+         raw += filter_bytes;
+         cur += output_bytes;
+         prior += output_bytes;
+      } else {
+         raw += 1;
+         cur += 1;
+         prior += 1;
+      }
+
+      // this is a little gross, so that we don't switch per-pixel or per-component
+      if (depth < 8 || img_n == out_n) {
+         int nk = (width - 1)*filter_bytes;
+         #define STBI__CASE(f) \
+             case f:     \
+                for (k=0; k < nk; ++k)
+         switch (filter) {
+            // "none" filter turns into a memcpy here; make that explicit.
+            case STBI__F_none:         memcpy(cur, raw, nk); break;
+            STBI__CASE(STBI__F_sub)          { cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); } break;
+            STBI__CASE(STBI__F_up)           { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break;
+            STBI__CASE(STBI__F_avg)          { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); } break;
+            STBI__CASE(STBI__F_paeth)        { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],prior[k],prior[k-filter_bytes])); } break;
+            STBI__CASE(STBI__F_avg_first)    { cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); } break;
+            STBI__CASE(STBI__F_paeth_first)  { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],0,0)); } break;
+         }
+         #undef STBI__CASE
+         raw += nk;
+      } else {
+         STBI_ASSERT(img_n+1 == out_n);
+         #define STBI__CASE(f) \
+             case f:     \
+                for (i=x-1; i >= 1; --i, cur[filter_bytes]=255,raw+=filter_bytes,cur+=output_bytes,prior+=output_bytes) \
+                   for (k=0; k < filter_bytes; ++k)
+         switch (filter) {
+            STBI__CASE(STBI__F_none)         { cur[k] = raw[k]; } break;
+            STBI__CASE(STBI__F_sub)          { cur[k] = STBI__BYTECAST(raw[k] + cur[k- output_bytes]); } break;
+            STBI__CASE(STBI__F_up)           { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break;
+            STBI__CASE(STBI__F_avg)          { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k- output_bytes])>>1)); } break;
+            STBI__CASE(STBI__F_paeth)        { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k- output_bytes],prior[k],prior[k- output_bytes])); } break;
+            STBI__CASE(STBI__F_avg_first)    { cur[k] = STBI__BYTECAST(raw[k] + (cur[k- output_bytes] >> 1)); } break;
+            STBI__CASE(STBI__F_paeth_first)  { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k- output_bytes],0,0)); } break;
+         }
+         #undef STBI__CASE
+
+         // the loop above sets the high byte of the pixels' alpha, but for
+         // 16 bit png files we also need the low byte set. we'll do that here.
+         if (depth == 16) {
+            cur = a->out + stride*j; // start at the beginning of the row again
+            for (i=0; i < x; ++i,cur+=output_bytes) {
+               cur[filter_bytes+1] = 255;
+            }
+         }
+      }
+   }
+
+   // we make a separate pass to expand bits to pixels; for performance,
+   // this could run two scanlines behind the above code, so it won't
+   // intefere with filtering but will still be in the cache.
+   if (depth < 8) {
+      for (j=0; j < y; ++j) {
+         stbi_uc *cur = a->out + stride*j;
+         stbi_uc *in  = a->out + stride*j + x*out_n - img_width_bytes;
+         // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the common 8-bit path optimal at minimal cost for 1/2/4-bit
+         // png guarante byte alignment, if width is not multiple of 8/4/2 we'll decode dummy trailing data that will be skipped in the later loop
+         stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range
+
+         // note that the final byte might overshoot and write more data than desired.
+         // we can allocate enough data that this never writes out of memory, but it
+         // could also overwrite the next scanline. can it overwrite non-empty data
+         // on the next scanline? yes, consider 1-pixel-wide scanlines with 1-bit-per-pixel.
+         // so we need to explicitly clamp the final ones
+
+         if (depth == 4) {
+            for (k=x*img_n; k >= 2; k-=2, ++in) {
+               *cur++ = scale * ((*in >> 4)       );
+               *cur++ = scale * ((*in     ) & 0x0f);
+            }
+            if (k > 0) *cur++ = scale * ((*in >> 4)       );
+         } else if (depth == 2) {
+            for (k=x*img_n; k >= 4; k-=4, ++in) {
+               *cur++ = scale * ((*in >> 6)       );
+               *cur++ = scale * ((*in >> 4) & 0x03);
+               *cur++ = scale * ((*in >> 2) & 0x03);
+               *cur++ = scale * ((*in     ) & 0x03);
+            }
+            if (k > 0) *cur++ = scale * ((*in >> 6)       );
+            if (k > 1) *cur++ = scale * ((*in >> 4) & 0x03);
+            if (k > 2) *cur++ = scale * ((*in >> 2) & 0x03);
+         } else if (depth == 1) {
+            for (k=x*img_n; k >= 8; k-=8, ++in) {
+               *cur++ = scale * ((*in >> 7)       );
+               *cur++ = scale * ((*in >> 6) & 0x01);
+               *cur++ = scale * ((*in >> 5) & 0x01);
+               *cur++ = scale * ((*in >> 4) & 0x01);
+               *cur++ = scale * ((*in >> 3) & 0x01);
+               *cur++ = scale * ((*in >> 2) & 0x01);
+               *cur++ = scale * ((*in >> 1) & 0x01);
+               *cur++ = scale * ((*in     ) & 0x01);
+            }
+            if (k > 0) *cur++ = scale * ((*in >> 7)       );
+            if (k > 1) *cur++ = scale * ((*in >> 6) & 0x01);
+            if (k > 2) *cur++ = scale * ((*in >> 5) & 0x01);
+            if (k > 3) *cur++ = scale * ((*in >> 4) & 0x01);
+            if (k > 4) *cur++ = scale * ((*in >> 3) & 0x01);
+            if (k > 5) *cur++ = scale * ((*in >> 2) & 0x01);
+            if (k > 6) *cur++ = scale * ((*in >> 1) & 0x01);
+         }
+         if (img_n != out_n) {
+            int q;
+            // insert alpha = 255
+            cur = a->out + stride*j;
+            if (img_n == 1) {
+               for (q=x-1; q >= 0; --q) {
+                  cur[q*2+1] = 255;
+                  cur[q*2+0] = cur[q];
+               }
+            } else {
+               STBI_ASSERT(img_n == 3);
+               for (q=x-1; q >= 0; --q) {
+                  cur[q*4+3] = 255;
+                  cur[q*4+2] = cur[q*3+2];
+                  cur[q*4+1] = cur[q*3+1];
+                  cur[q*4+0] = cur[q*3+0];
+               }
+            }
+         }
+      }
+   } else if (depth == 16) {
+      // force the image data from big-endian to platform-native.
+      // this is done in a separate pass due to the decoding relying
+      // on the data being untouched, but could probably be done
+      // per-line during decode if care is taken.
+      stbi_uc *cur = a->out;
+      stbi__uint16 *cur16 = (stbi__uint16*)cur;
+
+      for(i=0; i < x*y*out_n; ++i,cur16++,cur+=2) {
+         *cur16 = (cur[0] << 8) | cur[1];
+      }
+   }
+
+   return 1;
+}
+
+static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced)
+{
+   int bytes = (depth == 16 ? 2 : 1);
+   int out_bytes = out_n * bytes;
+   stbi_uc *final;
+   int p;
+   if (!interlaced)
+      return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color);
+
+   // de-interlacing
+   final = (stbi_uc *) stbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0);
+   for (p=0; p < 7; ++p) {
+      int xorig[] = { 0,4,0,2,0,1,0 };
+      int yorig[] = { 0,0,4,0,2,0,1 };
+      int xspc[]  = { 8,8,4,4,2,2,1 };
+      int yspc[]  = { 8,8,8,4,4,2,2 };
+      int i,j,x,y;
+      // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
+      x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p];
+      y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p];
+      if (x && y) {
+         stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y;
+         if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) {
+            STBI_FREE(final);
+            return 0;
+         }
+         for (j=0; j < y; ++j) {
+            for (i=0; i < x; ++i) {
+               int out_y = j*yspc[p]+yorig[p];
+               int out_x = i*xspc[p]+xorig[p];
+               memcpy(final + out_y*a->s->img_x*out_bytes + out_x*out_bytes,
+                      a->out + (j*x+i)*out_bytes, out_bytes);
+            }
+         }
+         STBI_FREE(a->out);
+         image_data += img_len;
+         image_data_len -= img_len;
+      }
+   }
+   a->out = final;
+
+   return 1;
+}
+
+static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n)
+{
+   stbi__context *s = z->s;
+   stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+   stbi_uc *p = z->out;
+
+   // compute color-based transparency, assuming we've
+   // already got 255 as the alpha value in the output
+   STBI_ASSERT(out_n == 2 || out_n == 4);
+
+   if (out_n == 2) {
+      for (i=0; i < pixel_count; ++i) {
+         p[1] = (p[0] == tc[0] ? 0 : 255);
+         p += 2;
+      }
+   } else {
+      for (i=0; i < pixel_count; ++i) {
+         if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
+            p[3] = 0;
+         p += 4;
+      }
+   }
+   return 1;
+}
+
+static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n)
+{
+   stbi__context *s = z->s;
+   stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+   stbi__uint16 *p = (stbi__uint16*) z->out;
+
+   // compute color-based transparency, assuming we've
+   // already got 65535 as the alpha value in the output
+   STBI_ASSERT(out_n == 2 || out_n == 4);
+
+   if (out_n == 2) {
+      for (i = 0; i < pixel_count; ++i) {
+         p[1] = (p[0] == tc[0] ? 0 : 65535);
+         p += 2;
+      }
+   } else {
+      for (i = 0; i < pixel_count; ++i) {
+         if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
+            p[3] = 0;
+         p += 4;
+      }
+   }
+   return 1;
+}
+
+static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n)
+{
+   stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y;
+   stbi_uc *p, *temp_out, *orig = a->out;
+
+   p = (stbi_uc *) stbi__malloc_mad2(pixel_count, pal_img_n, 0);
+   if (p == NULL) return stbi__err("outofmem", "Out of memory");
+
+   // between here and free(out) below, exitting would leak
+   temp_out = p;
+
+   if (pal_img_n == 3) {
+      for (i=0; i < pixel_count; ++i) {
+         int n = orig[i]*4;
+         p[0] = palette[n  ];
+         p[1] = palette[n+1];
+         p[2] = palette[n+2];
+         p += 3;
+      }
+   } else {
+      for (i=0; i < pixel_count; ++i) {
+         int n = orig[i]*4;
+         p[0] = palette[n  ];
+         p[1] = palette[n+1];
+         p[2] = palette[n+2];
+         p[3] = palette[n+3];
+         p += 4;
+      }
+   }
+   STBI_FREE(a->out);
+   a->out = temp_out;
+
+   STBI_NOTUSED(len);
+
+   return 1;
+}
+
+static int stbi__unpremultiply_on_load = 0;
+static int stbi__de_iphone_flag = 0;
+
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply)
+{
+   stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply;
+}
+
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert)
+{
+   stbi__de_iphone_flag = flag_true_if_should_convert;
+}
+
+static void stbi__de_iphone(stbi__png *z)
+{
+   stbi__context *s = z->s;
+   stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+   stbi_uc *p = z->out;
+
+   if (s->img_out_n == 3) {  // convert bgr to rgb
+      for (i=0; i < pixel_count; ++i) {
+         stbi_uc t = p[0];
+         p[0] = p[2];
+         p[2] = t;
+         p += 3;
+      }
+   } else {
+      STBI_ASSERT(s->img_out_n == 4);
+      if (stbi__unpremultiply_on_load) {
+         // convert bgr to rgb and unpremultiply
+         for (i=0; i < pixel_count; ++i) {
+            stbi_uc a = p[3];
+            stbi_uc t = p[0];
+            if (a) {
+               stbi_uc half = a / 2;
+               p[0] = (p[2] * 255 + half) / a;
+               p[1] = (p[1] * 255 + half) / a;
+               p[2] = ( t   * 255 + half) / a;
+            } else {
+               p[0] = p[2];
+               p[2] = t;
+            }
+            p += 4;
+         }
+      } else {
+         // convert bgr to rgb
+         for (i=0; i < pixel_count; ++i) {
+            stbi_uc t = p[0];
+            p[0] = p[2];
+            p[2] = t;
+            p += 4;
+         }
+      }
+   }
+}
+
+#define STBI__PNG_TYPE(a,b,c,d)  (((unsigned) (a) << 24) + ((unsigned) (b) << 16) + ((unsigned) (c) << 8) + (unsigned) (d))
+
+static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
+{
+   stbi_uc palette[1024], pal_img_n=0;
+   stbi_uc has_trans=0, tc[3]={0};
+   stbi__uint16 tc16[3];
+   stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0;
+   int first=1,k,interlace=0, color=0, is_iphone=0;
+   stbi__context *s = z->s;
+
+   z->expanded = NULL;
+   z->idata = NULL;
+   z->out = NULL;
+
+   if (!stbi__check_png_header(s)) return 0;
+
+   if (scan == STBI__SCAN_type) return 1;
+
+   for (;;) {
+      stbi__pngchunk c = stbi__get_chunk_header(s);
+      switch (c.type) {
+         case STBI__PNG_TYPE('C','g','B','I'):
+            is_iphone = 1;
+            stbi__skip(s, c.length);
+            break;
+         case STBI__PNG_TYPE('I','H','D','R'): {
+            int comp,filter;
+            if (!first) return stbi__err("multiple IHDR","Corrupt PNG");
+            first = 0;
+            if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG");
+            s->img_x = stbi__get32be(s); if (s->img_x > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
+            s->img_y = stbi__get32be(s); if (s->img_y > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
+            z->depth = stbi__get8(s);  if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16)  return stbi__err("1/2/4/8/16-bit only","PNG not supported: 1/2/4/8/16-bit only");
+            color = stbi__get8(s);  if (color > 6)         return stbi__err("bad ctype","Corrupt PNG");
+            if (color == 3 && z->depth == 16)                  return stbi__err("bad ctype","Corrupt PNG");
+            if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG");
+            comp  = stbi__get8(s);  if (comp) return stbi__err("bad comp method","Corrupt PNG");
+            filter= stbi__get8(s);  if (filter) return stbi__err("bad filter method","Corrupt PNG");
+            interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG");
+            if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG");
+            if (!pal_img_n) {
+               s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
+               if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");
+               if (scan == STBI__SCAN_header) return 1;
+            } else {
+               // if paletted, then pal_n is our final components, and
+               // img_n is # components to decompress/filter.
+               s->img_n = 1;
+               if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG");
+               // if SCAN_header, have to scan to see if we have a tRNS
+            }
+            break;
+         }
+
+         case STBI__PNG_TYPE('P','L','T','E'):  {
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG");
+            pal_len = c.length / 3;
+            if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG");
+            for (i=0; i < pal_len; ++i) {
+               palette[i*4+0] = stbi__get8(s);
+               palette[i*4+1] = stbi__get8(s);
+               palette[i*4+2] = stbi__get8(s);
+               palette[i*4+3] = 255;
+            }
+            break;
+         }
+
+         case STBI__PNG_TYPE('t','R','N','S'): {
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG");
+            if (pal_img_n) {
+               if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; }
+               if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG");
+               if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG");
+               pal_img_n = 4;
+               for (i=0; i < c.length; ++i)
+                  palette[i*4+3] = stbi__get8(s);
+            } else {
+               if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG");
+               if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG");
+               has_trans = 1;
+               if (z->depth == 16) {
+                  for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
+               } else {
+                  for (k = 0; k < s->img_n; ++k) tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger
+               }
+            }
+            break;
+         }
+
+         case STBI__PNG_TYPE('I','D','A','T'): {
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG");
+            if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; }
+            if ((int)(ioff + c.length) < (int)ioff) return 0;
+            if (ioff + c.length > idata_limit) {
+               stbi__uint32 idata_limit_old = idata_limit;
+               stbi_uc *p;
+               if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
+               while (ioff + c.length > idata_limit)
+                  idata_limit *= 2;
+               STBI_NOTUSED(idata_limit_old);
+               p = (stbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory");
+               z->idata = p;
+            }
+            if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG");
+            ioff += c.length;
+            break;
+         }
+
+         case STBI__PNG_TYPE('I','E','N','D'): {
+            stbi__uint32 raw_len, bpl;
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (scan != STBI__SCAN_load) return 1;
+            if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG");
+            // initial guess for decoded data size to avoid unnecessary reallocs
+            bpl = (s->img_x * z->depth + 7) / 8; // bytes per line, per component
+            raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */;
+            z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone);
+            if (z->expanded == NULL) return 0; // zlib should set error
+            STBI_FREE(z->idata); z->idata = NULL;
+            if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans)
+               s->img_out_n = s->img_n+1;
+            else
+               s->img_out_n = s->img_n;
+            if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, z->depth, color, interlace)) return 0;
+            if (has_trans) {
+               if (z->depth == 16) {
+                  if (!stbi__compute_transparency16(z, tc16, s->img_out_n)) return 0;
+               } else {
+                  if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0;
+               }
+            }
+            if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2)
+               stbi__de_iphone(z);
+            if (pal_img_n) {
+               // pal_img_n == 3 or 4
+               s->img_n = pal_img_n; // record the actual colors we had
+               s->img_out_n = pal_img_n;
+               if (req_comp >= 3) s->img_out_n = req_comp;
+               if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n))
+                  return 0;
+            } else if (has_trans) {
+               // non-paletted image with tRNS -> source image has (constant) alpha
+               ++s->img_n;
+            }
+            STBI_FREE(z->expanded); z->expanded = NULL;
+            // end of PNG chunk, read and skip CRC
+            stbi__get32be(s);
+            return 1;
+         }
+
+         default:
+            // if critical, fail
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if ((c.type & (1 << 29)) == 0) {
+               #ifndef STBI_NO_FAILURE_STRINGS
+               // not threadsafe
+               static char invalid_chunk[] = "XXXX PNG chunk not known";
+               invalid_chunk[0] = STBI__BYTECAST(c.type >> 24);
+               invalid_chunk[1] = STBI__BYTECAST(c.type >> 16);
+               invalid_chunk[2] = STBI__BYTECAST(c.type >>  8);
+               invalid_chunk[3] = STBI__BYTECAST(c.type >>  0);
+               #endif
+               return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type");
+            }
+            stbi__skip(s, c.length);
+            break;
+      }
+      // end of PNG chunk, read and skip CRC
+      stbi__get32be(s);
+   }
+}
+
+static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp, stbi__result_info *ri)
+{
+   void *result=NULL;
+   if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+   if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) {
+      if (p->depth < 8)
+         ri->bits_per_channel = 8;
+      else
+         ri->bits_per_channel = p->depth;
+      result = p->out;
+      p->out = NULL;
+      if (req_comp && req_comp != p->s->img_out_n) {
+         if (ri->bits_per_channel == 8)
+            result = stbi__convert_format((unsigned char *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
+         else
+            result = stbi__convert_format16((stbi__uint16 *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
+         p->s->img_out_n = req_comp;
+         if (result == NULL) return result;
+      }
+      *x = p->s->img_x;
+      *y = p->s->img_y;
+      if (n) *n = p->s->img_n;
+   }
+   STBI_FREE(p->out);      p->out      = NULL;
+   STBI_FREE(p->expanded); p->expanded = NULL;
+   STBI_FREE(p->idata);    p->idata    = NULL;
+
+   return result;
+}
+
+static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   stbi__png p;
+   p.s = s;
+   return stbi__do_png(&p, x,y,comp,req_comp, ri);
+}
+
+static int stbi__png_test(stbi__context *s)
+{
+   int r;
+   r = stbi__check_png_header(s);
+   stbi__rewind(s);
+   return r;
+}
+
+static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp)
+{
+   if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) {
+      stbi__rewind( p->s );
+      return 0;
+   }
+   if (x) *x = p->s->img_x;
+   if (y) *y = p->s->img_y;
+   if (comp) *comp = p->s->img_n;
+   return 1;
+}
+
+static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   stbi__png p;
+   p.s = s;
+   return stbi__png_info_raw(&p, x, y, comp);
+}
+
+static int stbi__png_is16(stbi__context *s)
+{
+   stbi__png p;
+   p.s = s;
+   if (!stbi__png_info_raw(&p, NULL, NULL, NULL))
+          return 0;
+   if (p.depth != 16) {
+      stbi__rewind(p.s);
+      return 0;
+   }
+   return 1;
+}
+#endif
+
+// Microsoft/Windows BMP image
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_test_raw(stbi__context *s)
+{
+   int r;
+   int sz;
+   if (stbi__get8(s) != 'B') return 0;
+   if (stbi__get8(s) != 'M') return 0;
+   stbi__get32le(s); // discard filesize
+   stbi__get16le(s); // discard reserved
+   stbi__get16le(s); // discard reserved
+   stbi__get32le(s); // discard data offset
+   sz = stbi__get32le(s);
+   r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
+   return r;
+}
+
+static int stbi__bmp_test(stbi__context *s)
+{
+   int r = stbi__bmp_test_raw(s);
+   stbi__rewind(s);
+   return r;
+}
+
+
+// returns 0..31 for the highest set bit
+static int stbi__high_bit(unsigned int z)
+{
+   int n=0;
+   if (z == 0) return -1;
+   if (z >= 0x10000) { n += 16; z >>= 16; }
+   if (z >= 0x00100) { n +=  8; z >>=  8; }
+   if (z >= 0x00010) { n +=  4; z >>=  4; }
+   if (z >= 0x00004) { n +=  2; z >>=  2; }
+   if (z >= 0x00002) { n +=  1;/* >>=  1;*/ }
+   return n;
+}
+
+static int stbi__bitcount(unsigned int a)
+{
+   a = (a & 0x55555555) + ((a >>  1) & 0x55555555); // max 2
+   a = (a & 0x33333333) + ((a >>  2) & 0x33333333); // max 4
+   a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
+   a = (a + (a >> 8)); // max 16 per 8 bits
+   a = (a + (a >> 16)); // max 32 per 8 bits
+   return a & 0xff;
+}
+
+// extract an arbitrarily-aligned N-bit value (N=bits)
+// from v, and then make it 8-bits long and fractionally
+// extend it to full full range.
+static int stbi__shiftsigned(unsigned int v, int shift, int bits)
+{
+   static unsigned int mul_table[9] = {
+      0,
+      0xff/*0b11111111*/, 0x55/*0b01010101*/, 0x49/*0b01001001*/, 0x11/*0b00010001*/,
+      0x21/*0b00100001*/, 0x41/*0b01000001*/, 0x81/*0b10000001*/, 0x01/*0b00000001*/,
+   };
+   static unsigned int shift_table[9] = {
+      0, 0,0,1,0,2,4,6,0,
+   };
+   if (shift < 0)
+      v <<= -shift;
+   else
+      v >>= shift;
+   STBI_ASSERT(v < 256);
+   v >>= (8-bits);
+   STBI_ASSERT(bits >= 0 && bits <= 8);
+   return (int) ((unsigned) v * mul_table[bits]) >> shift_table[bits];
+}
+
+typedef struct
+{
+   int bpp, offset, hsz;
+   unsigned int mr,mg,mb,ma, all_a;
+   int extra_read;
+} stbi__bmp_data;
+
+static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info)
+{
+   int hsz;
+   if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP");
+   stbi__get32le(s); // discard filesize
+   stbi__get16le(s); // discard reserved
+   stbi__get16le(s); // discard reserved
+   info->offset = stbi__get32le(s);
+   info->hsz = hsz = stbi__get32le(s);
+   info->mr = info->mg = info->mb = info->ma = 0;
+   info->extra_read = 14;
+
+   if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown");
+   if (hsz == 12) {
+      s->img_x = stbi__get16le(s);
+      s->img_y = stbi__get16le(s);
+   } else {
+      s->img_x = stbi__get32le(s);
+      s->img_y = stbi__get32le(s);
+   }
+   if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP");
+   info->bpp = stbi__get16le(s);
+   if (hsz != 12) {
+      int compress = stbi__get32le(s);
+      if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE");
+      stbi__get32le(s); // discard sizeof
+      stbi__get32le(s); // discard hres
+      stbi__get32le(s); // discard vres
+      stbi__get32le(s); // discard colorsused
+      stbi__get32le(s); // discard max important
+      if (hsz == 40 || hsz == 56) {
+         if (hsz == 56) {
+            stbi__get32le(s);
+            stbi__get32le(s);
+            stbi__get32le(s);
+            stbi__get32le(s);
+         }
+         if (info->bpp == 16 || info->bpp == 32) {
+            if (compress == 0) {
+               if (info->bpp == 32) {
+                  info->mr = 0xffu << 16;
+                  info->mg = 0xffu <<  8;
+                  info->mb = 0xffu <<  0;
+                  info->ma = 0xffu << 24;
+                  info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0
+               } else {
+                  info->mr = 31u << 10;
+                  info->mg = 31u <<  5;
+                  info->mb = 31u <<  0;
+               }
+            } else if (compress == 3) {
+               info->mr = stbi__get32le(s);
+               info->mg = stbi__get32le(s);
+               info->mb = stbi__get32le(s);
+               info->extra_read += 12;
+               // not documented, but generated by photoshop and handled by mspaint
+               if (info->mr == info->mg && info->mg == info->mb) {
+                  // ?!?!?
+                  return stbi__errpuc("bad BMP", "bad BMP");
+               }
+            } else
+               return stbi__errpuc("bad BMP", "bad BMP");
+         }
+      } else {
+         int i;
+         if (hsz != 108 && hsz != 124)
+            return stbi__errpuc("bad BMP", "bad BMP");
+         info->mr = stbi__get32le(s);
+         info->mg = stbi__get32le(s);
+         info->mb = stbi__get32le(s);
+         info->ma = stbi__get32le(s);
+         stbi__get32le(s); // discard color space
+         for (i=0; i < 12; ++i)
+            stbi__get32le(s); // discard color space parameters
+         if (hsz == 124) {
+            stbi__get32le(s); // discard rendering intent
+            stbi__get32le(s); // discard offset of profile data
+            stbi__get32le(s); // discard size of profile data
+            stbi__get32le(s); // discard reserved
+         }
+      }
+   }
+   return (void *) 1;
+}
+
+
+static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   stbi_uc *out;
+   unsigned int mr=0,mg=0,mb=0,ma=0, all_a;
+   stbi_uc pal[256][4];
+   int psize=0,i,j,width;
+   int flip_vertically, pad, target;
+   stbi__bmp_data info;
+   STBI_NOTUSED(ri);
+
+   info.all_a = 255;
+   if (stbi__bmp_parse_header(s, &info) == NULL)
+      return NULL; // error code already set
+
+   flip_vertically = ((int) s->img_y) > 0;
+   s->img_y = abs((int) s->img_y);
+
+   mr = info.mr;
+   mg = info.mg;
+   mb = info.mb;
+   ma = info.ma;
+   all_a = info.all_a;
+
+   if (info.hsz == 12) {
+      if (info.bpp < 24)
+         psize = (info.offset - info.extra_read - 24) / 3;
+   } else {
+      if (info.bpp < 16)
+         psize = (info.offset - info.extra_read - info.hsz) >> 2;
+   }
+   if (psize == 0) {
+      STBI_ASSERT(info.offset == (s->img_buffer - s->buffer_start));
+   }
+
+   if (info.bpp == 24 && ma == 0xff000000)
+      s->img_n = 3;
+   else
+      s->img_n = ma ? 4 : 3;
+   if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
+      target = req_comp;
+   else
+      target = s->img_n; // if they want monochrome, we'll post-convert
+
+   // sanity-check size
+   if (!stbi__mad3sizes_valid(target, s->img_x, s->img_y, 0))
+      return stbi__errpuc("too large", "Corrupt BMP");
+
+   out = (stbi_uc *) stbi__malloc_mad3(target, s->img_x, s->img_y, 0);
+   if (!out) return stbi__errpuc("outofmem", "Out of memory");
+   if (info.bpp < 16) {
+      int z=0;
+      if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); }
+      for (i=0; i < psize; ++i) {
+         pal[i][2] = stbi__get8(s);
+         pal[i][1] = stbi__get8(s);
+         pal[i][0] = stbi__get8(s);
+         if (info.hsz != 12) stbi__get8(s);
+         pal[i][3] = 255;
+      }
+      stbi__skip(s, info.offset - info.extra_read - info.hsz - psize * (info.hsz == 12 ? 3 : 4));
+      if (info.bpp == 1) width = (s->img_x + 7) >> 3;
+      else if (info.bpp == 4) width = (s->img_x + 1) >> 1;
+      else if (info.bpp == 8) width = s->img_x;
+      else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); }
+      pad = (-width)&3;
+      if (info.bpp == 1) {
+         for (j=0; j < (int) s->img_y; ++j) {
+            int bit_offset = 7, v = stbi__get8(s);
+            for (i=0; i < (int) s->img_x; ++i) {
+               int color = (v>>bit_offset)&0x1;
+               out[z++] = pal[color][0];
+               out[z++] = pal[color][1];
+               out[z++] = pal[color][2];
+               if (target == 4) out[z++] = 255;
+               if (i+1 == (int) s->img_x) break;
+               if((--bit_offset) < 0) {
+                  bit_offset = 7;
+                  v = stbi__get8(s);
+               }
+            }
+            stbi__skip(s, pad);
+         }
+      } else {
+         for (j=0; j < (int) s->img_y; ++j) {
+            for (i=0; i < (int) s->img_x; i += 2) {
+               int v=stbi__get8(s),v2=0;
+               if (info.bpp == 4) {
+                  v2 = v & 15;
+                  v >>= 4;
+               }
+               out[z++] = pal[v][0];
+               out[z++] = pal[v][1];
+               out[z++] = pal[v][2];
+               if (target == 4) out[z++] = 255;
+               if (i+1 == (int) s->img_x) break;
+               v = (info.bpp == 8) ? stbi__get8(s) : v2;
+               out[z++] = pal[v][0];
+               out[z++] = pal[v][1];
+               out[z++] = pal[v][2];
+               if (target == 4) out[z++] = 255;
+            }
+            stbi__skip(s, pad);
+         }
+      }
+   } else {
+      int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0;
+      int z = 0;
+      int easy=0;
+      stbi__skip(s, info.offset - info.extra_read - info.hsz);
+      if (info.bpp == 24) width = 3 * s->img_x;
+      else if (info.bpp == 16) width = 2*s->img_x;
+      else /* bpp = 32 and pad = 0 */ width=0;
+      pad = (-width) & 3;
+      if (info.bpp == 24) {
+         easy = 1;
+      } else if (info.bpp == 32) {
+         if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000)
+            easy = 2;
+      }
+      if (!easy) {
+         if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); }
+         // right shift amt to put high bit in position #7
+         rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr);
+         gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg);
+         bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb);
+         ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma);
+      }
+      for (j=0; j < (int) s->img_y; ++j) {
+         if (easy) {
+            for (i=0; i < (int) s->img_x; ++i) {
+               unsigned char a;
+               out[z+2] = stbi__get8(s);
+               out[z+1] = stbi__get8(s);
+               out[z+0] = stbi__get8(s);
+               z += 3;
+               a = (easy == 2 ? stbi__get8(s) : 255);
+               all_a |= a;
+               if (target == 4) out[z++] = a;
+            }
+         } else {
+            int bpp = info.bpp;
+            for (i=0; i < (int) s->img_x; ++i) {
+               stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s));
+               unsigned int a;
+               out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount));
+               out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount));
+               out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount));
+               a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255);
+               all_a |= a;
+               if (target == 4) out[z++] = STBI__BYTECAST(a);
+            }
+         }
+         stbi__skip(s, pad);
+      }
+   }
+
+   // if alpha channel is all 0s, replace with all 255s
+   if (target == 4 && all_a == 0)
+      for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4)
+         out[i] = 255;
+
+   if (flip_vertically) {
+      stbi_uc t;
+      for (j=0; j < (int) s->img_y>>1; ++j) {
+         stbi_uc *p1 = out +      j     *s->img_x*target;
+         stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target;
+         for (i=0; i < (int) s->img_x*target; ++i) {
+            t = p1[i]; p1[i] = p2[i]; p2[i] = t;
+         }
+      }
+   }
+
+   if (req_comp && req_comp != target) {
+      out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y);
+      if (out == NULL) return out; // stbi__convert_format frees input on failure
+   }
+
+   *x = s->img_x;
+   *y = s->img_y;
+   if (comp) *comp = s->img_n;
+   return out;
+}
+#endif
+
+// Targa Truevision - TGA
+// by Jonathan Dummer
+#ifndef STBI_NO_TGA
+// returns STBI_rgb or whatever, 0 on error
+static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16)
+{
+   // only RGB or RGBA (incl. 16bit) or grey allowed
+   if (is_rgb16) *is_rgb16 = 0;
+   switch(bits_per_pixel) {
+      case 8:  return STBI_grey;
+      case 16: if(is_grey) return STBI_grey_alpha;
+               // fallthrough
+      case 15: if(is_rgb16) *is_rgb16 = 1;
+               return STBI_rgb;
+      case 24: // fallthrough
+      case 32: return bits_per_pixel/8;
+      default: return 0;
+   }
+}
+
+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp)
+{
+    int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp;
+    int sz, tga_colormap_type;
+    stbi__get8(s);                   // discard Offset
+    tga_colormap_type = stbi__get8(s); // colormap type
+    if( tga_colormap_type > 1 ) {
+        stbi__rewind(s);
+        return 0;      // only RGB or indexed allowed
+    }
+    tga_image_type = stbi__get8(s); // image type
+    if ( tga_colormap_type == 1 ) { // colormapped (paletted) image
+        if (tga_image_type != 1 && tga_image_type != 9) {
+            stbi__rewind(s);
+            return 0;
+        }
+        stbi__skip(s,4);       // skip index of first colormap entry and number of entries
+        sz = stbi__get8(s);    //   check bits per palette color entry
+        if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) {
+            stbi__rewind(s);
+            return 0;
+        }
+        stbi__skip(s,4);       // skip image x and y origin
+        tga_colormap_bpp = sz;
+    } else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE
+        if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) {
+            stbi__rewind(s);
+            return 0; // only RGB or grey allowed, +/- RLE
+        }
+        stbi__skip(s,9); // skip colormap specification and image x/y origin
+        tga_colormap_bpp = 0;
+    }
+    tga_w = stbi__get16le(s);
+    if( tga_w < 1 ) {
+        stbi__rewind(s);
+        return 0;   // test width
+    }
+    tga_h = stbi__get16le(s);
+    if( tga_h < 1 ) {
+        stbi__rewind(s);
+        return 0;   // test height
+    }
+    tga_bits_per_pixel = stbi__get8(s); // bits per pixel
+    stbi__get8(s); // ignore alpha bits
+    if (tga_colormap_bpp != 0) {
+        if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) {
+            // when using a colormap, tga_bits_per_pixel is the size of the indexes
+            // I don't think anything but 8 or 16bit indexes makes sense
+            stbi__rewind(s);
+            return 0;
+        }
+        tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL);
+    } else {
+        tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL);
+    }
+    if(!tga_comp) {
+      stbi__rewind(s);
+      return 0;
+    }
+    if (x) *x = tga_w;
+    if (y) *y = tga_h;
+    if (comp) *comp = tga_comp;
+    return 1;                   // seems to have passed everything
+}
+
+static int stbi__tga_test(stbi__context *s)
+{
+   int res = 0;
+   int sz, tga_color_type;
+   stbi__get8(s);      //   discard Offset
+   tga_color_type = stbi__get8(s);   //   color type
+   if ( tga_color_type > 1 ) goto errorEnd;   //   only RGB or indexed allowed
+   sz = stbi__get8(s);   //   image type
+   if ( tga_color_type == 1 ) { // colormapped (paletted) image
+      if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9
+      stbi__skip(s,4);       // skip index of first colormap entry and number of entries
+      sz = stbi__get8(s);    //   check bits per palette color entry
+      if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
+      stbi__skip(s,4);       // skip image x and y origin
+   } else { // "normal" image w/o colormap
+      if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE
+      stbi__skip(s,9); // skip colormap specification and image x/y origin
+   }
+   if ( stbi__get16le(s) < 1 ) goto errorEnd;      //   test width
+   if ( stbi__get16le(s) < 1 ) goto errorEnd;      //   test height
+   sz = stbi__get8(s);   //   bits per pixel
+   if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index
+   if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
+
+   res = 1; // if we got this far, everything's good and we can return 1 instead of 0
+
+errorEnd:
+   stbi__rewind(s);
+   return res;
+}
+
+// read 16bit value and convert to 24bit RGB
+static void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out)
+{
+   stbi__uint16 px = (stbi__uint16)stbi__get16le(s);
+   stbi__uint16 fiveBitMask = 31;
+   // we have 3 channels with 5bits each
+   int r = (px >> 10) & fiveBitMask;
+   int g = (px >> 5) & fiveBitMask;
+   int b = px & fiveBitMask;
+   // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later
+   out[0] = (stbi_uc)((r * 255)/31);
+   out[1] = (stbi_uc)((g * 255)/31);
+   out[2] = (stbi_uc)((b * 255)/31);
+
+   // some people claim that the most significant bit might be used for alpha
+   // (possibly if an alpha-bit is set in the "image descriptor byte")
+   // but that only made 16bit test images completely translucent..
+   // so let's treat all 15 and 16bit TGAs as RGB with no alpha.
+}
+
+static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   //   read in the TGA header stuff
+   int tga_offset = stbi__get8(s);
+   int tga_indexed = stbi__get8(s);
+   int tga_image_type = stbi__get8(s);
+   int tga_is_RLE = 0;
+   int tga_palette_start = stbi__get16le(s);
+   int tga_palette_len = stbi__get16le(s);
+   int tga_palette_bits = stbi__get8(s);
+   int tga_x_origin = stbi__get16le(s);
+   int tga_y_origin = stbi__get16le(s);
+   int tga_width = stbi__get16le(s);
+   int tga_height = stbi__get16le(s);
+   int tga_bits_per_pixel = stbi__get8(s);
+   int tga_comp, tga_rgb16=0;
+   int tga_inverted = stbi__get8(s);
+   // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?)
+   //   image data
+   unsigned char *tga_data;
+   unsigned char *tga_palette = NULL;
+   int i, j;
+   unsigned char raw_data[4] = {0};
+   int RLE_count = 0;
+   int RLE_repeating = 0;
+   int read_next_pixel = 1;
+   STBI_NOTUSED(ri);
+   STBI_NOTUSED(tga_x_origin); // @TODO
+   STBI_NOTUSED(tga_y_origin); // @TODO
+
+   //   do a tiny bit of precessing
+   if ( tga_image_type >= 8 )
+   {
+      tga_image_type -= 8;
+      tga_is_RLE = 1;
+   }
+   tga_inverted = 1 - ((tga_inverted >> 5) & 1);
+
+   //   If I'm paletted, then I'll use the number of bits from the palette
+   if ( tga_indexed ) tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16);
+   else tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16);
+
+   if(!tga_comp) // shouldn't really happen, stbi__tga_test() should have ensured basic consistency
+      return stbi__errpuc("bad format", "Can't find out TGA pixelformat");
+
+   //   tga info
+   *x = tga_width;
+   *y = tga_height;
+   if (comp) *comp = tga_comp;
+
+   if (!stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0))
+      return stbi__errpuc("too large", "Corrupt TGA");
+
+   tga_data = (unsigned char*)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0);
+   if (!tga_data) return stbi__errpuc("outofmem", "Out of memory");
+
+   // skip to the data's starting position (offset usually = 0)
+   stbi__skip(s, tga_offset );
+
+   if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) {
+      for (i=0; i < tga_height; ++i) {
+         int row = tga_inverted ? tga_height -i - 1 : i;
+         stbi_uc *tga_row = tga_data + row*tga_width*tga_comp;
+         stbi__getn(s, tga_row, tga_width * tga_comp);
+      }
+   } else  {
+      //   do I need to load a palette?
+      if ( tga_indexed)
+      {
+         //   any data to skip? (offset usually = 0)
+         stbi__skip(s, tga_palette_start );
+         //   load the palette
+         tga_palette = (unsigned char*)stbi__malloc_mad2(tga_palette_len, tga_comp, 0);
+         if (!tga_palette) {
+            STBI_FREE(tga_data);
+            return stbi__errpuc("outofmem", "Out of memory");
+         }
+         if (tga_rgb16) {
+            stbi_uc *pal_entry = tga_palette;
+            STBI_ASSERT(tga_comp == STBI_rgb);
+            for (i=0; i < tga_palette_len; ++i) {
+               stbi__tga_read_rgb16(s, pal_entry);
+               pal_entry += tga_comp;
+            }
+         } else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) {
+               STBI_FREE(tga_data);
+               STBI_FREE(tga_palette);
+               return stbi__errpuc("bad palette", "Corrupt TGA");
+         }
+      }
+      //   load the data
+      for (i=0; i < tga_width * tga_height; ++i)
+      {
+         //   if I'm in RLE mode, do I need to get a RLE stbi__pngchunk?
+         if ( tga_is_RLE )
+         {
+            if ( RLE_count == 0 )
+            {
+               //   yep, get the next byte as a RLE command
+               int RLE_cmd = stbi__get8(s);
+               RLE_count = 1 + (RLE_cmd & 127);
+               RLE_repeating = RLE_cmd >> 7;
+               read_next_pixel = 1;
+            } else if ( !RLE_repeating )
+            {
+               read_next_pixel = 1;
+            }
+         } else
+         {
+            read_next_pixel = 1;
+         }
+         //   OK, if I need to read a pixel, do it now
+         if ( read_next_pixel )
+         {
+            //   load however much data we did have
+            if ( tga_indexed )
+            {
+               // read in index, then perform the lookup
+               int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s);
+               if ( pal_idx >= tga_palette_len ) {
+                  // invalid index
+                  pal_idx = 0;
+               }
+               pal_idx *= tga_comp;
+               for (j = 0; j < tga_comp; ++j) {
+                  raw_data[j] = tga_palette[pal_idx+j];
+               }
+            } else if(tga_rgb16) {
+               STBI_ASSERT(tga_comp == STBI_rgb);
+               stbi__tga_read_rgb16(s, raw_data);
+            } else {
+               //   read in the data raw
+               for (j = 0; j < tga_comp; ++j) {
+                  raw_data[j] = stbi__get8(s);
+               }
+            }
+            //   clear the reading flag for the next pixel
+            read_next_pixel = 0;
+         } // end of reading a pixel
+
+         // copy data
+         for (j = 0; j < tga_comp; ++j)
+           tga_data[i*tga_comp+j] = raw_data[j];
+
+         //   in case we're in RLE mode, keep counting down
+         --RLE_count;
+      }
+      //   do I need to invert the image?
+      if ( tga_inverted )
+      {
+         for (j = 0; j*2 < tga_height; ++j)
+         {
+            int index1 = j * tga_width * tga_comp;
+            int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
+            for (i = tga_width * tga_comp; i > 0; --i)
+            {
+               unsigned char temp = tga_data[index1];
+               tga_data[index1] = tga_data[index2];
+               tga_data[index2] = temp;
+               ++index1;
+               ++index2;
+            }
+         }
+      }
+      //   clear my palette, if I had one
+      if ( tga_palette != NULL )
+      {
+         STBI_FREE( tga_palette );
+      }
+   }
+
+   // swap RGB - if the source data was RGB16, it already is in the right order
+   if (tga_comp >= 3 && !tga_rgb16)
+   {
+      unsigned char* tga_pixel = tga_data;
+      for (i=0; i < tga_width * tga_height; ++i)
+      {
+         unsigned char temp = tga_pixel[0];
+         tga_pixel[0] = tga_pixel[2];
+         tga_pixel[2] = temp;
+         tga_pixel += tga_comp;
+      }
+   }
+
+   // convert to target component count
+   if (req_comp && req_comp != tga_comp)
+      tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height);
+
+   //   the things I do to get rid of an error message, and yet keep
+   //   Microsoft's C compilers happy... [8^(
+   tga_palette_start = tga_palette_len = tga_palette_bits =
+         tga_x_origin = tga_y_origin = 0;
+   STBI_NOTUSED(tga_palette_start);
+   //   OK, done
+   return tga_data;
+}
+#endif
+
+// *************************************************************************************************
+// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_test(stbi__context *s)
+{
+   int r = (stbi__get32be(s) == 0x38425053);
+   stbi__rewind(s);
+   return r;
+}
+
+static int stbi__psd_decode_rle(stbi__context *s, stbi_uc *p, int pixelCount)
+{
+   int count, nleft, len;
+
+   count = 0;
+   while ((nleft = pixelCount - count) > 0) {
+      len = stbi__get8(s);
+      if (len == 128) {
+         // No-op.
+      } else if (len < 128) {
+         // Copy next len+1 bytes literally.
+         len++;
+         if (len > nleft) return 0; // corrupt data
+         count += len;
+         while (len) {
+            *p = stbi__get8(s);
+            p += 4;
+            len--;
+         }
+      } else if (len > 128) {
+         stbi_uc   val;
+         // Next -len+1 bytes in the dest are replicated from next source byte.
+         // (Interpret len as a negative 8-bit int.)
+         len = 257 - len;
+         if (len > nleft) return 0; // corrupt data
+         val = stbi__get8(s);
+         count += len;
+         while (len) {
+            *p = val;
+            p += 4;
+            len--;
+         }
+      }
+   }
+
+   return 1;
+}
+
+static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc)
+{
+   int pixelCount;
+   int channelCount, compression;
+   int channel, i;
+   int bitdepth;
+   int w,h;
+   stbi_uc *out;
+   STBI_NOTUSED(ri);
+
+   // Check identifier
+   if (stbi__get32be(s) != 0x38425053)   // "8BPS"
+      return stbi__errpuc("not PSD", "Corrupt PSD image");
+
+   // Check file type version.
+   if (stbi__get16be(s) != 1)
+      return stbi__errpuc("wrong version", "Unsupported version of PSD image");
+
+   // Skip 6 reserved bytes.
+   stbi__skip(s, 6 );
+
+   // Read the number of channels (R, G, B, A, etc).
+   channelCount = stbi__get16be(s);
+   if (channelCount < 0 || channelCount > 16)
+      return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image");
+
+   // Read the rows and columns of the image.
+   h = stbi__get32be(s);
+   w = stbi__get32be(s);
+
+   // Make sure the depth is 8 bits.
+   bitdepth = stbi__get16be(s);
+   if (bitdepth != 8 && bitdepth != 16)
+      return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit");
+
+   // Make sure the color mode is RGB.
+   // Valid options are:
+   //   0: Bitmap
+   //   1: Grayscale
+   //   2: Indexed color
+   //   3: RGB color
+   //   4: CMYK color
+   //   7: Multichannel
+   //   8: Duotone
+   //   9: Lab color
+   if (stbi__get16be(s) != 3)
+      return stbi__errpuc("wrong color format", "PSD is not in RGB color format");
+
+   // Skip the Mode Data.  (It's the palette for indexed color; other info for other modes.)
+   stbi__skip(s,stbi__get32be(s) );
+
+   // Skip the image resources.  (resolution, pen tool paths, etc)
+   stbi__skip(s, stbi__get32be(s) );
+
+   // Skip the reserved data.
+   stbi__skip(s, stbi__get32be(s) );
+
+   // Find out if the data is compressed.
+   // Known values:
+   //   0: no compression
+   //   1: RLE compressed
+   compression = stbi__get16be(s);
+   if (compression > 1)
+      return stbi__errpuc("bad compression", "PSD has an unknown compression format");
+
+   // Check size
+   if (!stbi__mad3sizes_valid(4, w, h, 0))
+      return stbi__errpuc("too large", "Corrupt PSD");
+
+   // Create the destination image.
+
+   if (!compression && bitdepth == 16 && bpc == 16) {
+      out = (stbi_uc *) stbi__malloc_mad3(8, w, h, 0);
+      ri->bits_per_channel = 16;
+   } else
+      out = (stbi_uc *) stbi__malloc(4 * w*h);
+
+   if (!out) return stbi__errpuc("outofmem", "Out of memory");
+   pixelCount = w*h;
+
+   // Initialize the data to zero.
+   //memset( out, 0, pixelCount * 4 );
+
+   // Finally, the image data.
+   if (compression) {
+      // RLE as used by .PSD and .TIFF
+      // Loop until you get the number of unpacked bytes you are expecting:
+      //     Read the next source byte into n.
+      //     If n is between 0 and 127 inclusive, copy the next n+1 bytes literally.
+      //     Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times.
+      //     Else if n is 128, noop.
+      // Endloop
+
+      // The RLE-compressed data is preceded by a 2-byte data count for each row in the data,
+      // which we're going to just skip.
+      stbi__skip(s, h * channelCount * 2 );
+
+      // Read the RLE data by channel.
+      for (channel = 0; channel < 4; channel++) {
+         stbi_uc *p;
+
+         p = out+channel;
+         if (channel >= channelCount) {
+            // Fill this channel with default data.
+            for (i = 0; i < pixelCount; i++, p += 4)
+               *p = (channel == 3 ? 255 : 0);
+         } else {
+            // Read the RLE data.
+            if (!stbi__psd_decode_rle(s, p, pixelCount)) {
+               STBI_FREE(out);
+               return stbi__errpuc("corrupt", "bad RLE data");
+            }
+         }
+      }
+
+   } else {
+      // We're at the raw image data.  It's each channel in order (Red, Green, Blue, Alpha, ...)
+      // where each channel consists of an 8-bit (or 16-bit) value for each pixel in the image.
+
+      // Read the data by channel.
+      for (channel = 0; channel < 4; channel++) {
+         if (channel >= channelCount) {
+            // Fill this channel with default data.
+            if (bitdepth == 16 && bpc == 16) {
+               stbi__uint16 *q = ((stbi__uint16 *) out) + channel;
+               stbi__uint16 val = channel == 3 ? 65535 : 0;
+               for (i = 0; i < pixelCount; i++, q += 4)
+                  *q = val;
+            } else {
+               stbi_uc *p = out+channel;
+               stbi_uc val = channel == 3 ? 255 : 0;
+               for (i = 0; i < pixelCount; i++, p += 4)
+                  *p = val;
+            }
+         } else {
+            if (ri->bits_per_channel == 16) {    // output bpc
+               stbi__uint16 *q = ((stbi__uint16 *) out) + channel;
+               for (i = 0; i < pixelCount; i++, q += 4)
+                  *q = (stbi__uint16) stbi__get16be(s);
+            } else {
+               stbi_uc *p = out+channel;
+               if (bitdepth == 16) {  // input bpc
+                  for (i = 0; i < pixelCount; i++, p += 4)
+                     *p = (stbi_uc) (stbi__get16be(s) >> 8);
+               } else {
+                  for (i = 0; i < pixelCount; i++, p += 4)
+                     *p = stbi__get8(s);
+               }
+            }
+         }
+      }
+   }
+
+   // remove weird white matte from PSD
+   if (channelCount >= 4) {
+      if (ri->bits_per_channel == 16) {
+         for (i=0; i < w*h; ++i) {
+            stbi__uint16 *pixel = (stbi__uint16 *) out + 4*i;
+            if (pixel[3] != 0 && pixel[3] != 65535) {
+               float a = pixel[3] / 65535.0f;
+               float ra = 1.0f / a;
+               float inv_a = 65535.0f * (1 - ra);
+               pixel[0] = (stbi__uint16) (pixel[0]*ra + inv_a);
+               pixel[1] = (stbi__uint16) (pixel[1]*ra + inv_a);
+               pixel[2] = (stbi__uint16) (pixel[2]*ra + inv_a);
+            }
+         }
+      } else {
+         for (i=0; i < w*h; ++i) {
+            unsigned char *pixel = out + 4*i;
+            if (pixel[3] != 0 && pixel[3] != 255) {
+               float a = pixel[3] / 255.0f;
+               float ra = 1.0f / a;
+               float inv_a = 255.0f * (1 - ra);
+               pixel[0] = (unsigned char) (pixel[0]*ra + inv_a);
+               pixel[1] = (unsigned char) (pixel[1]*ra + inv_a);
+               pixel[2] = (unsigned char) (pixel[2]*ra + inv_a);
+            }
+         }
+      }
+   }
+
+   // convert to desired output format
+   if (req_comp && req_comp != 4) {
+      if (ri->bits_per_channel == 16)
+         out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, 4, req_comp, w, h);
+      else
+         out = stbi__convert_format(out, 4, req_comp, w, h);
+      if (out == NULL) return out; // stbi__convert_format frees input on failure
+   }
+
+   if (comp) *comp = 4;
+   *y = h;
+   *x = w;
+
+   return out;
+}
+#endif
+
+// *************************************************************************************************
+// Softimage PIC loader
+// by Tom Seddon
+//
+// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format
+// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_is4(stbi__context *s,const char *str)
+{
+   int i;
+   for (i=0; i<4; ++i)
+      if (stbi__get8(s) != (stbi_uc)str[i])
+         return 0;
+
+   return 1;
+}
+
+static int stbi__pic_test_core(stbi__context *s)
+{
+   int i;
+
+   if (!stbi__pic_is4(s,"\x53\x80\xF6\x34"))
+      return 0;
+
+   for(i=0;i<84;++i)
+      stbi__get8(s);
+
+   if (!stbi__pic_is4(s,"PICT"))
+      return 0;
+
+   return 1;
+}
+
+typedef struct
+{
+   stbi_uc size,type,channel;
+} stbi__pic_packet;
+
+static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest)
+{
+   int mask=0x80, i;
+
+   for (i=0; i<4; ++i, mask>>=1) {
+      if (channel & mask) {
+         if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short");
+         dest[i]=stbi__get8(s);
+      }
+   }
+
+   return dest;
+}
+
+static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src)
+{
+   int mask=0x80,i;
+
+   for (i=0;i<4; ++i, mask>>=1)
+      if (channel&mask)
+         dest[i]=src[i];
+}
+
+static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result)
+{
+   int act_comp=0,num_packets=0,y,chained;
+   stbi__pic_packet packets[10];
+
+   // this will (should...) cater for even some bizarre stuff like having data
+    // for the same channel in multiple packets.
+   do {
+      stbi__pic_packet *packet;
+
+      if (num_packets==sizeof(packets)/sizeof(packets[0]))
+         return stbi__errpuc("bad format","too many packets");
+
+      packet = &packets[num_packets++];
+
+      chained = stbi__get8(s);
+      packet->size    = stbi__get8(s);
+      packet->type    = stbi__get8(s);
+      packet->channel = stbi__get8(s);
+
+      act_comp |= packet->channel;
+
+      if (stbi__at_eof(s))          return stbi__errpuc("bad file","file too short (reading packets)");
+      if (packet->size != 8)  return stbi__errpuc("bad format","packet isn't 8bpp");
+   } while (chained);
+
+   *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel?
+
+   for(y=0; y<height; ++y) {
+      int packet_idx;
+
+      for(packet_idx=0; packet_idx < num_packets; ++packet_idx) {
+         stbi__pic_packet *packet = &packets[packet_idx];
+         stbi_uc *dest = result+y*width*4;
+
+         switch (packet->type) {
+            default:
+               return stbi__errpuc("bad format","packet has bad compression type");
+
+            case 0: {//uncompressed
+               int x;
+
+               for(x=0;x<width;++x, dest+=4)
+                  if (!stbi__readval(s,packet->channel,dest))
+                     return 0;
+               break;
+            }
+
+            case 1://Pure RLE
+               {
+                  int left=width, i;
+
+                  while (left>0) {
+                     stbi_uc count,value[4];
+
+                     count=stbi__get8(s);
+                     if (stbi__at_eof(s))   return stbi__errpuc("bad file","file too short (pure read count)");
+
+                     if (count > left)
+                        count = (stbi_uc) left;
+
+                     if (!stbi__readval(s,packet->channel,value))  return 0;
+
+                     for(i=0; i<count; ++i,dest+=4)
+                        stbi__copyval(packet->channel,dest,value);
+                     left -= count;
+                  }
+               }
+               break;
+
+            case 2: {//Mixed RLE
+               int left=width;
+               while (left>0) {
+                  int count = stbi__get8(s), i;
+                  if (stbi__at_eof(s))  return stbi__errpuc("bad file","file too short (mixed read count)");
+
+                  if (count >= 128) { // Repeated
+                     stbi_uc value[4];
+
+                     if (count==128)
+                        count = stbi__get16be(s);
+                     else
+                        count -= 127;
+                     if (count > left)
+                        return stbi__errpuc("bad file","scanline overrun");
+
+                     if (!stbi__readval(s,packet->channel,value))
+                        return 0;
+
+                     for(i=0;i<count;++i, dest += 4)
+                        stbi__copyval(packet->channel,dest,value);
+                  } else { // Raw
+                     ++count;
+                     if (count>left) return stbi__errpuc("bad file","scanline overrun");
+
+                     for(i=0;i<count;++i, dest+=4)
+                        if (!stbi__readval(s,packet->channel,dest))
+                           return 0;
+                  }
+                  left-=count;
+               }
+               break;
+            }
+         }
+      }
+   }
+
+   return result;
+}
+
+static void *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp, stbi__result_info *ri)
+{
+   stbi_uc *result;
+   int i, x,y, internal_comp;
+   STBI_NOTUSED(ri);
+
+   if (!comp) comp = &internal_comp;
+
+   for (i=0; i<92; ++i)
+      stbi__get8(s);
+
+   x = stbi__get16be(s);
+   y = stbi__get16be(s);
+   if (stbi__at_eof(s))  return stbi__errpuc("bad file","file too short (pic header)");
+   if (!stbi__mad3sizes_valid(x, y, 4, 0)) return stbi__errpuc("too large", "PIC image too large to decode");
+
+   stbi__get32be(s); //skip `ratio'
+   stbi__get16be(s); //skip `fields'
+   stbi__get16be(s); //skip `pad'
+
+   // intermediate buffer is RGBA
+   result = (stbi_uc *) stbi__malloc_mad3(x, y, 4, 0);
+   memset(result, 0xff, x*y*4);
+
+   if (!stbi__pic_load_core(s,x,y,comp, result)) {
+      STBI_FREE(result);
+      result=0;
+   }
+   *px = x;
+   *py = y;
+   if (req_comp == 0) req_comp = *comp;
+   result=stbi__convert_format(result,4,req_comp,x,y);
+
+   return result;
+}
+
+static int stbi__pic_test(stbi__context *s)
+{
+   int r = stbi__pic_test_core(s);
+   stbi__rewind(s);
+   return r;
+}
+#endif
+
+// *************************************************************************************************
+// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
+
+#ifndef STBI_NO_GIF
+typedef struct
+{
+   stbi__int16 prefix;
+   stbi_uc first;
+   stbi_uc suffix;
+} stbi__gif_lzw;
+
+typedef struct
+{
+   int w,h;
+   stbi_uc *out;                 // output buffer (always 4 components)
+   stbi_uc *background;          // The current "background" as far as a gif is concerned
+   stbi_uc *history;
+   int flags, bgindex, ratio, transparent, eflags;
+   stbi_uc  pal[256][4];
+   stbi_uc lpal[256][4];
+   stbi__gif_lzw codes[8192];
+   stbi_uc *color_table;
+   int parse, step;
+   int lflags;
+   int start_x, start_y;
+   int max_x, max_y;
+   int cur_x, cur_y;
+   int line_size;
+   int delay;
+} stbi__gif;
+
+static int stbi__gif_test_raw(stbi__context *s)
+{
+   int sz;
+   if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0;
+   sz = stbi__get8(s);
+   if (sz != '9' && sz != '7') return 0;
+   if (stbi__get8(s) != 'a') return 0;
+   return 1;
+}
+
+static int stbi__gif_test(stbi__context *s)
+{
+   int r = stbi__gif_test_raw(s);
+   stbi__rewind(s);
+   return r;
+}
+
+static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp)
+{
+   int i;
+   for (i=0; i < num_entries; ++i) {
+      pal[i][2] = stbi__get8(s);
+      pal[i][1] = stbi__get8(s);
+      pal[i][0] = stbi__get8(s);
+      pal[i][3] = transp == i ? 0 : 255;
+   }
+}
+
+static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info)
+{
+   stbi_uc version;
+   if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8')
+      return stbi__err("not GIF", "Corrupt GIF");
+
+   version = stbi__get8(s);
+   if (version != '7' && version != '9')    return stbi__err("not GIF", "Corrupt GIF");
+   if (stbi__get8(s) != 'a')                return stbi__err("not GIF", "Corrupt GIF");
+
+   stbi__g_failure_reason = "";
+   g->w = stbi__get16le(s);
+   g->h = stbi__get16le(s);
+   g->flags = stbi__get8(s);
+   g->bgindex = stbi__get8(s);
+   g->ratio = stbi__get8(s);
+   g->transparent = -1;
+
+   if (comp != 0) *comp = 4;  // can't actually tell whether it's 3 or 4 until we parse the comments
+
+   if (is_info) return 1;
+
+   if (g->flags & 0x80)
+      stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1);
+
+   return 1;
+}
+
+static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp)
+{
+   stbi__gif* g = (stbi__gif*) stbi__malloc(sizeof(stbi__gif));
+   if (!stbi__gif_header(s, g, comp, 1)) {
+      STBI_FREE(g);
+      stbi__rewind( s );
+      return 0;
+   }
+   if (x) *x = g->w;
+   if (y) *y = g->h;
+   STBI_FREE(g);
+   return 1;
+}
+
+static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code)
+{
+   stbi_uc *p, *c;
+   int idx;
+
+   // recurse to decode the prefixes, since the linked-list is backwards,
+   // and working backwards through an interleaved image would be nasty
+   if (g->codes[code].prefix >= 0)
+      stbi__out_gif_code(g, g->codes[code].prefix);
+
+   if (g->cur_y >= g->max_y) return;
+
+   idx = g->cur_x + g->cur_y;
+   p = &g->out[idx];
+   g->history[idx / 4] = 1;
+
+   c = &g->color_table[g->codes[code].suffix * 4];
+   if (c[3] > 128) { // don't render transparent pixels;
+      p[0] = c[2];
+      p[1] = c[1];
+      p[2] = c[0];
+      p[3] = c[3];
+   }
+   g->cur_x += 4;
+
+   if (g->cur_x >= g->max_x) {
+      g->cur_x = g->start_x;
+      g->cur_y += g->step;
+
+      while (g->cur_y >= g->max_y && g->parse > 0) {
+         g->step = (1 << g->parse) * g->line_size;
+         g->cur_y = g->start_y + (g->step >> 1);
+         --g->parse;
+      }
+   }
+}
+
+static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
+{
+   stbi_uc lzw_cs;
+   stbi__int32 len, init_code;
+   stbi__uint32 first;
+   stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
+   stbi__gif_lzw *p;
+
+   lzw_cs = stbi__get8(s);
+   if (lzw_cs > 12) return NULL;
+   clear = 1 << lzw_cs;
+   first = 1;
+   codesize = lzw_cs + 1;
+   codemask = (1 << codesize) - 1;
+   bits = 0;
+   valid_bits = 0;
+   for (init_code = 0; init_code < clear; init_code++) {
+      g->codes[init_code].prefix = -1;
+      g->codes[init_code].first = (stbi_uc) init_code;
+      g->codes[init_code].suffix = (stbi_uc) init_code;
+   }
+
+   // support no starting clear code
+   avail = clear+2;
+   oldcode = -1;
+
+   len = 0;
+   for(;;) {
+      if (valid_bits < codesize) {
+         if (len == 0) {
+            len = stbi__get8(s); // start new block
+            if (len == 0)
+               return g->out;
+         }
+         --len;
+         bits |= (stbi__int32) stbi__get8(s) << valid_bits;
+         valid_bits += 8;
+      } else {
+         stbi__int32 code = bits & codemask;
+         bits >>= codesize;
+         valid_bits -= codesize;
+         // @OPTIMIZE: is there some way we can accelerate the non-clear path?
+         if (code == clear) {  // clear code
+            codesize = lzw_cs + 1;
+            codemask = (1 << codesize) - 1;
+            avail = clear + 2;
+            oldcode = -1;
+            first = 0;
+         } else if (code == clear + 1) { // end of stream code
+            stbi__skip(s, len);
+            while ((len = stbi__get8(s)) > 0)
+               stbi__skip(s,len);
+            return g->out;
+         } else if (code <= avail) {
+            if (first) {
+               return stbi__errpuc("no clear code", "Corrupt GIF");
+            }
+
+            if (oldcode >= 0) {
+               p = &g->codes[avail++];
+               if (avail > 8192) {
+                  return stbi__errpuc("too many codes", "Corrupt GIF");
+               }
+
+               p->prefix = (stbi__int16) oldcode;
+               p->first = g->codes[oldcode].first;
+               p->suffix = (code == avail) ? p->first : g->codes[code].first;
+            } else if (code == avail)
+               return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+
+            stbi__out_gif_code(g, (stbi__uint16) code);
+
+            if ((avail & codemask) == 0 && avail <= 0x0FFF) {
+               codesize++;
+               codemask = (1 << codesize) - 1;
+            }
+
+            oldcode = code;
+         } else {
+            return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+         }
+      }
+   }
+}
+
+// this function is designed to support animated gifs, although stb_image doesn't support it
+// two back is the image from two frames ago, used for a very specific disposal format
+static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp, stbi_uc *two_back)
+{
+   int dispose;
+   int first_frame;
+   int pi;
+   int pcount;
+   STBI_NOTUSED(req_comp);
+
+   // on first frame, any non-written pixels get the background colour (non-transparent)
+   first_frame = 0;
+   if (g->out == 0) {
+      if (!stbi__gif_header(s, g, comp,0)) return 0; // stbi__g_failure_reason set by stbi__gif_header
+      if (!stbi__mad3sizes_valid(4, g->w, g->h, 0))
+         return stbi__errpuc("too large", "GIF image is too large");
+      pcount = g->w * g->h;
+      g->out = (stbi_uc *) stbi__malloc(4 * pcount);
+      g->background = (stbi_uc *) stbi__malloc(4 * pcount);
+      g->history = (stbi_uc *) stbi__malloc(pcount);
+      if (!g->out || !g->background || !g->history)
+         return stbi__errpuc("outofmem", "Out of memory");
+
+      // image is treated as "transparent" at the start - ie, nothing overwrites the current background;
+      // background colour is only used for pixels that are not rendered first frame, after that "background"
+      // color refers to the color that was there the previous frame.
+      memset(g->out, 0x00, 4 * pcount);
+      memset(g->background, 0x00, 4 * pcount); // state of the background (starts transparent)
+      memset(g->history, 0x00, pcount);        // pixels that were affected previous frame
+      first_frame = 1;
+   } else {
+      // second frame - how do we dispoase of the previous one?
+      dispose = (g->eflags & 0x1C) >> 2;
+      pcount = g->w * g->h;
+
+      if ((dispose == 3) && (two_back == 0)) {
+         dispose = 2; // if I don't have an image to revert back to, default to the old background
+      }
+
+      if (dispose == 3) { // use previous graphic
+         for (pi = 0; pi < pcount; ++pi) {
+            if (g->history[pi]) {
+               memcpy( &g->out[pi * 4], &two_back[pi * 4], 4 );
+            }
+         }
+      } else if (dispose == 2) {
+         // restore what was changed last frame to background before that frame;
+         for (pi = 0; pi < pcount; ++pi) {
+            if (g->history[pi]) {
+               memcpy( &g->out[pi * 4], &g->background[pi * 4], 4 );
+            }
+         }
+      } else {
+         // This is a non-disposal case eithe way, so just
+         // leave the pixels as is, and they will become the new background
+         // 1: do not dispose
+         // 0:  not specified.
+      }
+
+      // background is what out is after the undoing of the previou frame;
+      memcpy( g->background, g->out, 4 * g->w * g->h );
+   }
+
+   // clear my history;
+   memset( g->history, 0x00, g->w * g->h );        // pixels that were affected previous frame
+
+   for (;;) {
+      int tag = stbi__get8(s);
+      switch (tag) {
+         case 0x2C: /* Image Descriptor */
+         {
+            stbi__int32 x, y, w, h;
+            stbi_uc *o;
+
+            x = stbi__get16le(s);
+            y = stbi__get16le(s);
+            w = stbi__get16le(s);
+            h = stbi__get16le(s);
+            if (((x + w) > (g->w)) || ((y + h) > (g->h)))
+               return stbi__errpuc("bad Image Descriptor", "Corrupt GIF");
+
+            g->line_size = g->w * 4;
+            g->start_x = x * 4;
+            g->start_y = y * g->line_size;
+            g->max_x   = g->start_x + w * 4;
+            g->max_y   = g->start_y + h * g->line_size;
+            g->cur_x   = g->start_x;
+            g->cur_y   = g->start_y;
+
+            // if the width of the specified rectangle is 0, that means
+            // we may not see *any* pixels or the image is malformed;
+            // to make sure this is caught, move the current y down to
+            // max_y (which is what out_gif_code checks).
+            if (w == 0)
+               g->cur_y = g->max_y;
+
+            g->lflags = stbi__get8(s);
+
+            if (g->lflags & 0x40) {
+               g->step = 8 * g->line_size; // first interlaced spacing
+               g->parse = 3;
+            } else {
+               g->step = g->line_size;
+               g->parse = 0;
+            }
+
+            if (g->lflags & 0x80) {
+               stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1);
+               g->color_table = (stbi_uc *) g->lpal;
+            } else if (g->flags & 0x80) {
+               g->color_table = (stbi_uc *) g->pal;
+            } else
+               return stbi__errpuc("missing color table", "Corrupt GIF");
+
+            o = stbi__process_gif_raster(s, g);
+            if (!o) return NULL;
+
+            // if this was the first frame,
+            pcount = g->w * g->h;
+            if (first_frame && (g->bgindex > 0)) {
+               // if first frame, any pixel not drawn to gets the background color
+               for (pi = 0; pi < pcount; ++pi) {
+                  if (g->history[pi] == 0) {
+                     g->pal[g->bgindex][3] = 255; // just in case it was made transparent, undo that; It will be reset next frame if need be;
+                     memcpy( &g->out[pi * 4], &g->pal[g->bgindex], 4 );
+                  }
+               }
+            }
+
+            return o;
+         }
+
+         case 0x21: // Comment Extension.
+         {
+            int len;
+            int ext = stbi__get8(s);
+            if (ext == 0xF9) { // Graphic Control Extension.
+               len = stbi__get8(s);
+               if (len == 4) {
+                  g->eflags = stbi__get8(s);
+                  g->delay = 10 * stbi__get16le(s); // delay - 1/100th of a second, saving as 1/1000ths.
+
+                  // unset old transparent
+                  if (g->transparent >= 0) {
+                     g->pal[g->transparent][3] = 255;
+                  }
+                  if (g->eflags & 0x01) {
+                     g->transparent = stbi__get8(s);
+                     if (g->transparent >= 0) {
+                        g->pal[g->transparent][3] = 0;
+                     }
+                  } else {
+                     // don't need transparent
+                     stbi__skip(s, 1);
+                     g->transparent = -1;
+                  }
+               } else {
+                  stbi__skip(s, len);
+                  break;
+               }
+            }
+            while ((len = stbi__get8(s)) != 0) {
+               stbi__skip(s, len);
+            }
+            break;
+         }
+
+         case 0x3B: // gif stream termination code
+            return (stbi_uc *) s; // using '1' causes warning on some compilers
+
+         default:
+            return stbi__errpuc("unknown code", "Corrupt GIF");
+      }
+   }
+}
+
+static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp)
+{
+   if (stbi__gif_test(s)) {
+      int layers = 0;
+      stbi_uc *u = 0;
+      stbi_uc *out = 0;
+      stbi_uc *two_back = 0;
+      stbi__gif g;
+      int stride;
+      memset(&g, 0, sizeof(g));
+      if (delays) {
+         *delays = 0;
+      }
+
+      do {
+         u = stbi__gif_load_next(s, &g, comp, req_comp, two_back);
+         if (u == (stbi_uc *) s) u = 0;  // end of animated gif marker
+
+         if (u) {
+            *x = g.w;
+            *y = g.h;
+            ++layers;
+            stride = g.w * g.h * 4;
+
+            if (out) {
+               void *tmp = (stbi_uc*) STBI_REALLOC( out, layers * stride );
+               if (NULL == tmp) {
+                  STBI_FREE(g.out);
+                  STBI_FREE(g.history);
+                  STBI_FREE(g.background);
+                  return stbi__errpuc("outofmem", "Out of memory");
+               }
+               else
+                  out = (stbi_uc*) tmp;
+               if (delays) {
+                  *delays = (int*) STBI_REALLOC( *delays, sizeof(int) * layers );
+               }
+            } else {
+               out = (stbi_uc*)stbi__malloc( layers * stride );
+               if (delays) {
+                  *delays = (int*) stbi__malloc( layers * sizeof(int) );
+               }
+            }
+            memcpy( out + ((layers - 1) * stride), u, stride );
+            if (layers >= 2) {
+               two_back = out - 2 * stride;
+            }
+
+            if (delays) {
+               (*delays)[layers - 1U] = g.delay;
+            }
+         }
+      } while (u != 0);
+
+      // free temp buffer;
+      STBI_FREE(g.out);
+      STBI_FREE(g.history);
+      STBI_FREE(g.background);
+
+      // do the final conversion after loading everything;
+      if (req_comp && req_comp != 4)
+         out = stbi__convert_format(out, 4, req_comp, layers * g.w, g.h);
+
+      *z = layers;
+      return out;
+   } else {
+      return stbi__errpuc("not GIF", "Image was not as a gif type.");
+   }
+}
+
+static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   stbi_uc *u = 0;
+   stbi__gif g;
+   memset(&g, 0, sizeof(g));
+   STBI_NOTUSED(ri);
+
+   u = stbi__gif_load_next(s, &g, comp, req_comp, 0);
+   if (u == (stbi_uc *) s) u = 0;  // end of animated gif marker
+   if (u) {
+      *x = g.w;
+      *y = g.h;
+
+      // moved conversion to after successful load so that the same
+      // can be done for multiple frames.
+      if (req_comp && req_comp != 4)
+         u = stbi__convert_format(u, 4, req_comp, g.w, g.h);
+   } else if (g.out) {
+      // if there was an error and we allocated an image buffer, free it!
+      STBI_FREE(g.out);
+   }
+
+   // free buffers needed for multiple frame loading;
+   STBI_FREE(g.history);
+   STBI_FREE(g.background);
+
+   return u;
+}
+
+static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   return stbi__gif_info_raw(s,x,y,comp);
+}
+#endif
+
+// *************************************************************************************************
+// Radiance RGBE HDR loader
+// originally by Nicolas Schulz
+#ifndef STBI_NO_HDR
+static int stbi__hdr_test_core(stbi__context *s, const char *signature)
+{
+   int i;
+   for (i=0; signature[i]; ++i)
+      if (stbi__get8(s) != signature[i])
+          return 0;
+   stbi__rewind(s);
+   return 1;
+}
+
+static int stbi__hdr_test(stbi__context* s)
+{
+   int r = stbi__hdr_test_core(s, "#?RADIANCE\n");
+   stbi__rewind(s);
+   if(!r) {
+       r = stbi__hdr_test_core(s, "#?RGBE\n");
+       stbi__rewind(s);
+   }
+   return r;
+}
+
+#define STBI__HDR_BUFLEN  1024
+static char *stbi__hdr_gettoken(stbi__context *z, char *buffer)
+{
+   int len=0;
+   char c = '\0';
+
+   c = (char) stbi__get8(z);
+
+   while (!stbi__at_eof(z) && c != '\n') {
+      buffer[len++] = c;
+      if (len == STBI__HDR_BUFLEN-1) {
+         // flush to end of line
+         while (!stbi__at_eof(z) && stbi__get8(z) != '\n')
+            ;
+         break;
+      }
+      c = (char) stbi__get8(z);
+   }
+
+   buffer[len] = 0;
+   return buffer;
+}
+
+static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp)
+{
+   if ( input[3] != 0 ) {
+      float f1;
+      // Exponent
+      f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8));
+      if (req_comp <= 2)
+         output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
+      else {
+         output[0] = input[0] * f1;
+         output[1] = input[1] * f1;
+         output[2] = input[2] * f1;
+      }
+      if (req_comp == 2) output[1] = 1;
+      if (req_comp == 4) output[3] = 1;
+   } else {
+      switch (req_comp) {
+         case 4: output[3] = 1; /* fallthrough */
+         case 3: output[0] = output[1] = output[2] = 0;
+                 break;
+         case 2: output[1] = 1; /* fallthrough */
+         case 1: output[0] = 0;
+                 break;
+      }
+   }
+}
+
+static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   char buffer[STBI__HDR_BUFLEN];
+   char *token;
+   int valid = 0;
+   int width, height;
+   stbi_uc *scanline;
+   float *hdr_data;
+   int len;
+   unsigned char count, value;
+   int i, j, k, c1,c2, z;
+   const char *headerToken;
+   STBI_NOTUSED(ri);
+
+   // Check identifier
+   headerToken = stbi__hdr_gettoken(s,buffer);
+   if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0)
+      return stbi__errpf("not HDR", "Corrupt HDR image");
+
+   // Parse header
+   for(;;) {
+      token = stbi__hdr_gettoken(s,buffer);
+      if (token[0] == 0) break;
+      if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+   }
+
+   if (!valid)    return stbi__errpf("unsupported format", "Unsupported HDR format");
+
+   // Parse width and height
+   // can't use sscanf() if we're not using stdio!
+   token = stbi__hdr_gettoken(s,buffer);
+   if (strncmp(token, "-Y ", 3))  return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+   token += 3;
+   height = (int) strtol(token, &token, 10);
+   while (*token == ' ') ++token;
+   if (strncmp(token, "+X ", 3))  return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+   token += 3;
+   width = (int) strtol(token, NULL, 10);
+
+   *x = width;
+   *y = height;
+
+   if (comp) *comp = 3;
+   if (req_comp == 0) req_comp = 3;
+
+   if (!stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0))
+      return stbi__errpf("too large", "HDR image is too large");
+
+   // Read data
+   hdr_data = (float *) stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0);
+   if (!hdr_data)
+      return stbi__errpf("outofmem", "Out of memory");
+
+   // Load image data
+   // image data is stored as some number of sca
+   if ( width < 8 || width >= 32768) {
+      // Read flat data
+      for (j=0; j < height; ++j) {
+         for (i=0; i < width; ++i) {
+            stbi_uc rgbe[4];
+           main_decode_loop:
+            stbi__getn(s, rgbe, 4);
+            stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
+         }
+      }
+   } else {
+      // Read RLE-encoded data
+      scanline = NULL;
+
+      for (j = 0; j < height; ++j) {
+         c1 = stbi__get8(s);
+         c2 = stbi__get8(s);
+         len = stbi__get8(s);
+         if (c1 != 2 || c2 != 2 || (len & 0x80)) {
+            // not run-length encoded, so we have to actually use THIS data as a decoded
+            // pixel (note this can't be a valid pixel--one of RGB must be >= 128)
+            stbi_uc rgbe[4];
+            rgbe[0] = (stbi_uc) c1;
+            rgbe[1] = (stbi_uc) c2;
+            rgbe[2] = (stbi_uc) len;
+            rgbe[3] = (stbi_uc) stbi__get8(s);
+            stbi__hdr_convert(hdr_data, rgbe, req_comp);
+            i = 1;
+            j = 0;
+            STBI_FREE(scanline);
+            goto main_decode_loop; // yes, this makes no sense
+         }
+         len <<= 8;
+         len |= stbi__get8(s);
+         if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); }
+         if (scanline == NULL) {
+            scanline = (stbi_uc *) stbi__malloc_mad2(width, 4, 0);
+            if (!scanline) {
+               STBI_FREE(hdr_data);
+               return stbi__errpf("outofmem", "Out of memory");
+            }
+         }
+
+         for (k = 0; k < 4; ++k) {
+            int nleft;
+            i = 0;
+            while ((nleft = width - i) > 0) {
+               count = stbi__get8(s);
+               if (count > 128) {
+                  // Run
+                  value = stbi__get8(s);
+                  count -= 128;
+                  if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
+                  for (z = 0; z < count; ++z)
+                     scanline[i++ * 4 + k] = value;
+               } else {
+                  // Dump
+                  if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
+                  for (z = 0; z < count; ++z)
+                     scanline[i++ * 4 + k] = stbi__get8(s);
+               }
+            }
+         }
+         for (i=0; i < width; ++i)
+            stbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp);
+      }
+      if (scanline)
+         STBI_FREE(scanline);
+   }
+
+   return hdr_data;
+}
+
+static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   char buffer[STBI__HDR_BUFLEN];
+   char *token;
+   int valid = 0;
+   int dummy;
+
+   if (!x) x = &dummy;
+   if (!y) y = &dummy;
+   if (!comp) comp = &dummy;
+
+   if (stbi__hdr_test(s) == 0) {
+       stbi__rewind( s );
+       return 0;
+   }
+
+   for(;;) {
+      token = stbi__hdr_gettoken(s,buffer);
+      if (token[0] == 0) break;
+      if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+   }
+
+   if (!valid) {
+       stbi__rewind( s );
+       return 0;
+   }
+   token = stbi__hdr_gettoken(s,buffer);
+   if (strncmp(token, "-Y ", 3)) {
+       stbi__rewind( s );
+       return 0;
+   }
+   token += 3;
+   *y = (int) strtol(token, &token, 10);
+   while (*token == ' ') ++token;
+   if (strncmp(token, "+X ", 3)) {
+       stbi__rewind( s );
+       return 0;
+   }
+   token += 3;
+   *x = (int) strtol(token, NULL, 10);
+   *comp = 3;
+   return 1;
+}
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   void *p;
+   stbi__bmp_data info;
+
+   info.all_a = 255;
+   p = stbi__bmp_parse_header(s, &info);
+   stbi__rewind( s );
+   if (p == NULL)
+      return 0;
+   if (x) *x = s->img_x;
+   if (y) *y = s->img_y;
+   if (comp) {
+      if (info.bpp == 24 && info.ma == 0xff000000)
+         *comp = 3;
+      else
+         *comp = info.ma ? 4 : 3;
+   }
+   return 1;
+}
+#endif
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int channelCount, dummy, depth;
+   if (!x) x = &dummy;
+   if (!y) y = &dummy;
+   if (!comp) comp = &dummy;
+   if (stbi__get32be(s) != 0x38425053) {
+       stbi__rewind( s );
+       return 0;
+   }
+   if (stbi__get16be(s) != 1) {
+       stbi__rewind( s );
+       return 0;
+   }
+   stbi__skip(s, 6);
+   channelCount = stbi__get16be(s);
+   if (channelCount < 0 || channelCount > 16) {
+       stbi__rewind( s );
+       return 0;
+   }
+   *y = stbi__get32be(s);
+   *x = stbi__get32be(s);
+   depth = stbi__get16be(s);
+   if (depth != 8 && depth != 16) {
+       stbi__rewind( s );
+       return 0;
+   }
+   if (stbi__get16be(s) != 3) {
+       stbi__rewind( s );
+       return 0;
+   }
+   *comp = 4;
+   return 1;
+}
+
+static int stbi__psd_is16(stbi__context *s)
+{
+   int channelCount, depth;
+   if (stbi__get32be(s) != 0x38425053) {
+       stbi__rewind( s );
+       return 0;
+   }
+   if (stbi__get16be(s) != 1) {
+       stbi__rewind( s );
+       return 0;
+   }
+   stbi__skip(s, 6);
+   channelCount = stbi__get16be(s);
+   if (channelCount < 0 || channelCount > 16) {
+       stbi__rewind( s );
+       return 0;
+   }
+   (void) stbi__get32be(s);
+   (void) stbi__get32be(s);
+   depth = stbi__get16be(s);
+   if (depth != 16) {
+       stbi__rewind( s );
+       return 0;
+   }
+   return 1;
+}
+#endif
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int act_comp=0,num_packets=0,chained,dummy;
+   stbi__pic_packet packets[10];
+
+   if (!x) x = &dummy;
+   if (!y) y = &dummy;
+   if (!comp) comp = &dummy;
+
+   if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) {
+      stbi__rewind(s);
+      return 0;
+   }
+
+   stbi__skip(s, 88);
+
+   *x = stbi__get16be(s);
+   *y = stbi__get16be(s);
+   if (stbi__at_eof(s)) {
+      stbi__rewind( s);
+      return 0;
+   }
+   if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) {
+      stbi__rewind( s );
+      return 0;
+   }
+
+   stbi__skip(s, 8);
+
+   do {
+      stbi__pic_packet *packet;
+
+      if (num_packets==sizeof(packets)/sizeof(packets[0]))
+         return 0;
+
+      packet = &packets[num_packets++];
+      chained = stbi__get8(s);
+      packet->size    = stbi__get8(s);
+      packet->type    = stbi__get8(s);
+      packet->channel = stbi__get8(s);
+      act_comp |= packet->channel;
+
+      if (stbi__at_eof(s)) {
+          stbi__rewind( s );
+          return 0;
+      }
+      if (packet->size != 8) {
+          stbi__rewind( s );
+          return 0;
+      }
+   } while (chained);
+
+   *comp = (act_comp & 0x10 ? 4 : 3);
+
+   return 1;
+}
+#endif
+
+// *************************************************************************************************
+// Portable Gray Map and Portable Pixel Map loader
+// by Ken Miller
+//
+// PGM: http://netpbm.sourceforge.net/doc/pgm.html
+// PPM: http://netpbm.sourceforge.net/doc/ppm.html
+//
+// Known limitations:
+//    Does not support comments in the header section
+//    Does not support ASCII image data (formats P2 and P3)
+//    Does not support 16-bit-per-channel
+
+#ifndef STBI_NO_PNM
+
+static int      stbi__pnm_test(stbi__context *s)
+{
+   char p, t;
+   p = (char) stbi__get8(s);
+   t = (char) stbi__get8(s);
+   if (p != 'P' || (t != '5' && t != '6')) {
+       stbi__rewind( s );
+       return 0;
+   }
+   return 1;
+}
+
+static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   stbi_uc *out;
+   STBI_NOTUSED(ri);
+
+   if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n))
+      return 0;
+
+   *x = s->img_x;
+   *y = s->img_y;
+   if (comp) *comp = s->img_n;
+
+   if (!stbi__mad3sizes_valid(s->img_n, s->img_x, s->img_y, 0))
+      return stbi__errpuc("too large", "PNM too large");
+
+   out = (stbi_uc *) stbi__malloc_mad3(s->img_n, s->img_x, s->img_y, 0);
+   if (!out) return stbi__errpuc("outofmem", "Out of memory");
+   stbi__getn(s, out, s->img_n * s->img_x * s->img_y);
+
+   if (req_comp && req_comp != s->img_n) {
+      out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
+      if (out == NULL) return out; // stbi__convert_format frees input on failure
+   }
+   return out;
+}
+
+static int      stbi__pnm_isspace(char c)
+{
+   return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r';
+}
+
+static void     stbi__pnm_skip_whitespace(stbi__context *s, char *c)
+{
+   for (;;) {
+      while (!stbi__at_eof(s) && stbi__pnm_isspace(*c))
+         *c = (char) stbi__get8(s);
+
+      if (stbi__at_eof(s) || *c != '#')
+         break;
+
+      while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' )
+         *c = (char) stbi__get8(s);
+   }
+}
+
+static int      stbi__pnm_isdigit(char c)
+{
+   return c >= '0' && c <= '9';
+}
+
+static int      stbi__pnm_getinteger(stbi__context *s, char *c)
+{
+   int value = 0;
+
+   while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {
+      value = value*10 + (*c - '0');
+      *c = (char) stbi__get8(s);
+   }
+
+   return value;
+}
+
+static int      stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int maxv, dummy;
+   char c, p, t;
+
+   if (!x) x = &dummy;
+   if (!y) y = &dummy;
+   if (!comp) comp = &dummy;
+
+   stbi__rewind(s);
+
+   // Get identifier
+   p = (char) stbi__get8(s);
+   t = (char) stbi__get8(s);
+   if (p != 'P' || (t != '5' && t != '6')) {
+       stbi__rewind(s);
+       return 0;
+   }
+
+   *comp = (t == '6') ? 3 : 1;  // '5' is 1-component .pgm; '6' is 3-component .ppm
+
+   c = (char) stbi__get8(s);
+   stbi__pnm_skip_whitespace(s, &c);
+
+   *x = stbi__pnm_getinteger(s, &c); // read width
+   stbi__pnm_skip_whitespace(s, &c);
+
+   *y = stbi__pnm_getinteger(s, &c); // read height
+   stbi__pnm_skip_whitespace(s, &c);
+
+   maxv = stbi__pnm_getinteger(s, &c);  // read max value
+
+   if (maxv > 255)
+      return stbi__err("max value > 255", "PPM image not 8-bit");
+   else
+      return 1;
+}
+#endif
+
+static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp)
+{
+   #ifndef STBI_NO_JPEG
+   if (stbi__jpeg_info(s, x, y, comp)) return 1;
+   #endif
+
+   #ifndef STBI_NO_PNG
+   if (stbi__png_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_GIF
+   if (stbi__gif_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_BMP
+   if (stbi__bmp_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_PSD
+   if (stbi__psd_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_PIC
+   if (stbi__pic_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_PNM
+   if (stbi__pnm_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_HDR
+   if (stbi__hdr_info(s, x, y, comp))  return 1;
+   #endif
+
+   // test tga last because it's a crappy test!
+   #ifndef STBI_NO_TGA
+   if (stbi__tga_info(s, x, y, comp))
+       return 1;
+   #endif
+   return stbi__err("unknown image type", "Image not of any known type, or corrupt");
+}
+
+static int stbi__is_16_main(stbi__context *s)
+{
+   #ifndef STBI_NO_PNG
+   if (stbi__png_is16(s))  return 1;
+   #endif
+
+   #ifndef STBI_NO_PSD
+   if (stbi__psd_is16(s))  return 1;
+   #endif
+
+   return 0;
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp)
+{
+    FILE *f = stbi__fopen(filename, "rb");
+    int result;
+    if (!f) return stbi__err("can't fopen", "Unable to open file");
+    result = stbi_info_from_file(f, x, y, comp);
+    fclose(f);
+    return result;
+}
+
+STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp)
+{
+   int r;
+   stbi__context s;
+   long pos = ftell(f);
+   stbi__start_file(&s, f);
+   r = stbi__info_main(&s,x,y,comp);
+   fseek(f,pos,SEEK_SET);
+   return r;
+}
+
+STBIDEF int stbi_is_16_bit(char const *filename)
+{
+    FILE *f = stbi__fopen(filename, "rb");
+    int result;
+    if (!f) return stbi__err("can't fopen", "Unable to open file");
+    result = stbi_is_16_bit_from_file(f);
+    fclose(f);
+    return result;
+}
+
+STBIDEF int stbi_is_16_bit_from_file(FILE *f)
+{
+   int r;
+   stbi__context s;
+   long pos = ftell(f);
+   stbi__start_file(&s, f);
+   r = stbi__is_16_main(&s);
+   fseek(f,pos,SEEK_SET);
+   return r;
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__info_main(&s,x,y,comp);
+}
+
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user);
+   return stbi__info_main(&s,x,y,comp);
+}
+
+STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__is_16_main(&s);
+}
+
+STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *c, void *user)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user);
+   return stbi__is_16_main(&s);
+}
+
+#endif // STB_IMAGE_IMPLEMENTATION
+
+/*
+   revision history:
+      2.20  (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs
+      2.19  (2018-02-11) fix warning
+      2.18  (2018-01-30) fix warnings
+      2.17  (2018-01-29) change sbti__shiftsigned to avoid clang -O2 bug
+                         1-bit BMP
+                         *_is_16_bit api
+                         avoid warnings
+      2.16  (2017-07-23) all functions have 16-bit variants;
+                         STBI_NO_STDIO works again;
+                         compilation fixes;
+                         fix rounding in unpremultiply;
+                         optimize vertical flip;
+                         disable raw_len validation;
+                         documentation fixes
+      2.15  (2017-03-18) fix png-1,2,4 bug; now all Imagenet JPGs decode;
+                         warning fixes; disable run-time SSE detection on gcc;
+                         uniform handling of optional "return" values;
+                         thread-safe initialization of zlib tables
+      2.14  (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs
+      2.13  (2016-11-29) add 16-bit API, only supported for PNG right now
+      2.12  (2016-04-02) fix typo in 2.11 PSD fix that caused crashes
+      2.11  (2016-04-02) allocate large structures on the stack
+                         remove white matting for transparent PSD
+                         fix reported channel count for PNG & BMP
+                         re-enable SSE2 in non-gcc 64-bit
+                         support RGB-formatted JPEG
+                         read 16-bit PNGs (only as 8-bit)
+      2.10  (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED
+      2.09  (2016-01-16) allow comments in PNM files
+                         16-bit-per-pixel TGA (not bit-per-component)
+                         info() for TGA could break due to .hdr handling
+                         info() for BMP to shares code instead of sloppy parse
+                         can use STBI_REALLOC_SIZED if allocator doesn't support realloc
+                         code cleanup
+      2.08  (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA
+      2.07  (2015-09-13) fix compiler warnings
+                         partial animated GIF support
+                         limited 16-bpc PSD support
+                         #ifdef unused functions
+                         bug with < 92 byte PIC,PNM,HDR,TGA
+      2.06  (2015-04-19) fix bug where PSD returns wrong '*comp' value
+      2.05  (2015-04-19) fix bug in progressive JPEG handling, fix warning
+      2.04  (2015-04-15) try to re-enable SIMD on MinGW 64-bit
+      2.03  (2015-04-12) extra corruption checking (mmozeiko)
+                         stbi_set_flip_vertically_on_load (nguillemot)
+                         fix NEON support; fix mingw support
+      2.02  (2015-01-19) fix incorrect assert, fix warning
+      2.01  (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2
+      2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG
+      2.00  (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg)
+                         progressive JPEG (stb)
+                         PGM/PPM support (Ken Miller)
+                         STBI_MALLOC,STBI_REALLOC,STBI_FREE
+                         GIF bugfix -- seemingly never worked
+                         STBI_NO_*, STBI_ONLY_*
+      1.48  (2014-12-14) fix incorrectly-named assert()
+      1.47  (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb)
+                         optimize PNG (ryg)
+                         fix bug in interlaced PNG with user-specified channel count (stb)
+      1.46  (2014-08-26)
+              fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG
+      1.45  (2014-08-16)
+              fix MSVC-ARM internal compiler error by wrapping malloc
+      1.44  (2014-08-07)
+              various warning fixes from Ronny Chevalier
+      1.43  (2014-07-15)
+              fix MSVC-only compiler problem in code changed in 1.42
+      1.42  (2014-07-09)
+              don't define _CRT_SECURE_NO_WARNINGS (affects user code)
+              fixes to stbi__cleanup_jpeg path
+              added STBI_ASSERT to avoid requiring assert.h
+      1.41  (2014-06-25)
+              fix search&replace from 1.36 that messed up comments/error messages
+      1.40  (2014-06-22)
+              fix gcc struct-initialization warning
+      1.39  (2014-06-15)
+              fix to TGA optimization when req_comp != number of components in TGA;
+              fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite)
+              add support for BMP version 5 (more ignored fields)
+      1.38  (2014-06-06)
+              suppress MSVC warnings on integer casts truncating values
+              fix accidental rename of 'skip' field of I/O
+      1.37  (2014-06-04)
+              remove duplicate typedef
+      1.36  (2014-06-03)
+              convert to header file single-file library
+              if de-iphone isn't set, load iphone images color-swapped instead of returning NULL
+      1.35  (2014-05-27)
+              various warnings
+              fix broken STBI_SIMD path
+              fix bug where stbi_load_from_file no longer left file pointer in correct place
+              fix broken non-easy path for 32-bit BMP (possibly never used)
+              TGA optimization by Arseny Kapoulkine
+      1.34  (unknown)
+              use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case
+      1.33  (2011-07-14)
+              make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements
+      1.32  (2011-07-13)
+              support for "info" function for all supported filetypes (SpartanJ)
+      1.31  (2011-06-20)
+              a few more leak fixes, bug in PNG handling (SpartanJ)
+      1.30  (2011-06-11)
+              added ability to load files via callbacks to accomidate custom input streams (Ben Wenger)
+              removed deprecated format-specific test/load functions
+              removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway
+              error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha)
+              fix inefficiency in decoding 32-bit BMP (David Woo)
+      1.29  (2010-08-16)
+              various warning fixes from Aurelien Pocheville
+      1.28  (2010-08-01)
+              fix bug in GIF palette transparency (SpartanJ)
+      1.27  (2010-08-01)
+              cast-to-stbi_uc to fix warnings
+      1.26  (2010-07-24)
+              fix bug in file buffering for PNG reported by SpartanJ
+      1.25  (2010-07-17)
+              refix trans_data warning (Won Chun)
+      1.24  (2010-07-12)
+              perf improvements reading from files on platforms with lock-heavy fgetc()
+              minor perf improvements for jpeg
+              deprecated type-specific functions so we'll get feedback if they're needed
+              attempt to fix trans_data warning (Won Chun)
+      1.23    fixed bug in iPhone support
+      1.22  (2010-07-10)
+              removed image *writing* support
+              stbi_info support from Jetro Lauha
+              GIF support from Jean-Marc Lienher
+              iPhone PNG-extensions from James Brown
+              warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva)
+      1.21    fix use of 'stbi_uc' in header (reported by jon blow)
+      1.20    added support for Softimage PIC, by Tom Seddon
+      1.19    bug in interlaced PNG corruption check (found by ryg)
+      1.18  (2008-08-02)
+              fix a threading bug (local mutable static)
+      1.17    support interlaced PNG
+      1.16    major bugfix - stbi__convert_format converted one too many pixels
+      1.15    initialize some fields for thread safety
+      1.14    fix threadsafe conversion bug
+              header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
+      1.13    threadsafe
+      1.12    const qualifiers in the API
+      1.11    Support installable IDCT, colorspace conversion routines
+      1.10    Fixes for 64-bit (don't use "unsigned long")
+              optimized upsampling by Fabian "ryg" Giesen
+      1.09    Fix format-conversion for PSD code (bad global variables!)
+      1.08    Thatcher Ulrich's PSD code integrated by Nicolas Schulz
+      1.07    attempt to fix C++ warning/errors again
+      1.06    attempt to fix C++ warning/errors again
+      1.05    fix TGA loading to return correct *comp and use good luminance calc
+      1.04    default float alpha is 1, not 255; use 'void *' for stbi_image_free
+      1.03    bugfixes to STBI_NO_STDIO, STBI_NO_HDR
+      1.02    support for (subset of) HDR files, float interface for preferred access to them
+      1.01    fix bug: possible bug in handling right-side up bmps... not sure
+              fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all
+      1.00    interface to zlib that skips zlib header
+      0.99    correct handling of alpha in palette
+      0.98    TGA loader by lonesock; dynamically add loaders (untested)
+      0.97    jpeg errors on too large a file; also catch another malloc failure
+      0.96    fix detection of invalid v value - particleman@mollyrocket forum
+      0.95    during header scan, seek to markers in case of padding
+      0.94    STBI_NO_STDIO to disable stdio usage; rename all #defines the same
+      0.93    handle jpegtran output; verbose errors
+      0.92    read 4,8,16,24,32-bit BMP files of several formats
+      0.91    output 24-bit Windows 3.0 BMP files
+      0.90    fix a few more warnings; bump version number to approach 1.0
+      0.61    bugfixes due to Marc LeBlanc, Christopher Lloyd
+      0.60    fix compiling as c++
+      0.59    fix warnings: merge Dave Moore's -Wall fixes
+      0.58    fix bug: zlib uncompressed mode len/nlen was wrong endian
+      0.57    fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available
+      0.56    fix bug: zlib uncompressed mode len vs. nlen
+      0.55    fix bug: restart_interval not initialized to 0
+      0.54    allow NULL for 'int *comp'
+      0.53    fix bug in png 3->4; speedup png decoding
+      0.52    png handles req_comp=3,4 directly; minor cleanup; jpeg comments
+      0.51    obey req_comp requests, 1-component jpegs return as 1-component,
+              on 'test' only check type, not whether we support this variant
+      0.50  (2006-11-19)
+              first released version
+*/
+
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/
\ No newline at end of file

diff --git a/src/nbvtf/stb/stb_image_write.h b/src/nbvtf/stb/stb_image_write.h
new file mode 100755 (executable)
index 0000000..39c829c
--- /dev/null
+++ b/src/nbvtf/stb/stb_image_write.h
@@ -0,0 +1,1691 @@
+/* stb_image_write - v1.15 - public domain - http://nothings.org/stb
+   writes out PNG/BMP/TGA/JPEG/HDR images to C stdio - Sean Barrett 2010-2015
+                                     no warranty implied; use at your own risk
+
+   Before #including,
+
+       #define STB_IMAGE_WRITE_IMPLEMENTATION
+
+   in the file that you want to have the implementation.
+
+   Will probably not work correctly with strict-aliasing optimizations.
+
+ABOUT:
+
+   This header file is a library for writing images to C stdio or a callback.
+
+   The PNG output is not optimal; it is 20-50% larger than the file
+   written by a decent optimizing implementation; though providing a custom
+   zlib compress function (see STBIW_ZLIB_COMPRESS) can mitigate that.
+   This library is designed for source code compactness and simplicity,
+   not optimal image file size or run-time performance.
+
+BUILDING:
+
+   You can #define STBIW_ASSERT(x) before the #include to avoid using assert.h.
+   You can #define STBIW_MALLOC(), STBIW_REALLOC(), and STBIW_FREE() to replace
+   malloc,realloc,free.
+   You can #define STBIW_MEMMOVE() to replace memmove()
+   You can #define STBIW_ZLIB_COMPRESS to use a custom zlib-style compress function
+   for PNG compression (instead of the builtin one), it must have the following signature:
+   unsigned char * my_compress(unsigned char *data, int data_len, int *out_len, int quality);
+   The returned data will be freed with STBIW_FREE() (free() by default),
+   so it must be heap allocated with STBIW_MALLOC() (malloc() by default),
+
+UNICODE:
+
+   If compiling for Windows and you wish to use Unicode filenames, compile
+   with
+       #define STBIW_WINDOWS_UTF8
+   and pass utf8-encoded filenames. Call stbiw_convert_wchar_to_utf8 to convert
+   Windows wchar_t filenames to utf8.
+
+USAGE:
+
+   There are five functions, one for each image file format:
+
+     int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
+     int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
+     int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
+     int stbi_write_jpg(char const *filename, int w, int h, int comp, const void *data, int quality);
+     int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data);
+
+     void stbi_flip_vertically_on_write(int flag); // flag is non-zero to flip data vertically
+
+   There are also five equivalent functions that use an arbitrary write function. You are
+   expected to open/close your file-equivalent before and after calling these:
+
+     int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void  *data, int stride_in_bytes);
+     int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void  *data);
+     int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void  *data);
+     int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data);
+     int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality);
+
+   where the callback is:
+      void stbi_write_func(void *context, void *data, int size);
+
+   You can configure it with these global variables:
+      int stbi_write_tga_with_rle;             // defaults to true; set to 0 to disable RLE
+      int stbi_write_png_compression_level;    // defaults to 8; set to higher for more compression
+      int stbi_write_force_png_filter;         // defaults to -1; set to 0..5 to force a filter mode
+
+
+   You can define STBI_WRITE_NO_STDIO to disable the file variant of these
+   functions, so the library will not use stdio.h at all. However, this will
+   also disable HDR writing, because it requires stdio for formatted output.
+
+   Each function returns 0 on failure and non-0 on success.
+
+   The functions create an image file defined by the parameters. The image
+   is a rectangle of pixels stored from left-to-right, top-to-bottom.
+   Each pixel contains 'comp' channels of data stored interleaved with 8-bits
+   per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is
+   monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall.
+   The *data pointer points to the first byte of the top-left-most pixel.
+   For PNG, "stride_in_bytes" is the distance in bytes from the first byte of
+   a row of pixels to the first byte of the next row of pixels.
+
+   PNG creates output files with the same number of components as the input.
+   The BMP format expands Y to RGB in the file format and does not
+   output alpha.
+
+   PNG supports writing rectangles of data even when the bytes storing rows of
+   data are not consecutive in memory (e.g. sub-rectangles of a larger image),
+   by supplying the stride between the beginning of adjacent rows. The other
+   formats do not. (Thus you cannot write a native-format BMP through the BMP
+   writer, both because it is in BGR order and because it may have padding
+   at the end of the line.)
+
+   PNG allows you to set the deflate compression level by setting the global
+   variable 'stbi_write_png_compression_level' (it defaults to 8).
+
+   HDR expects linear float data. Since the format is always 32-bit rgb(e)
+   data, alpha (if provided) is discarded, and for monochrome data it is
+   replicated across all three channels.
+
+   TGA supports RLE or non-RLE compressed data. To use non-RLE-compressed
+   data, set the global variable 'stbi_write_tga_with_rle' to 0.
+
+   JPEG does ignore alpha channels in input data; quality is between 1 and 100.
+   Higher quality looks better but results in a bigger image.
+   JPEG baseline (no JPEG progressive).
+
+CREDITS:
+
+
+   Sean Barrett           -    PNG/BMP/TGA
+   Baldur Karlsson        -    HDR
+   Jean-Sebastien Guay    -    TGA monochrome
+   Tim Kelsey             -    misc enhancements
+   Alan Hickman           -    TGA RLE
+   Emmanuel Julien        -    initial file IO callback implementation
+   Jon Olick              -    original jo_jpeg.cpp code
+   Daniel Gibson          -    integrate JPEG, allow external zlib
+   Aarni Koskela          -    allow choosing PNG filter
+
+   bugfixes:
+      github:Chribba
+      Guillaume Chereau
+      github:jry2
+      github:romigrou
+      Sergio Gonzalez
+      Jonas Karlsson
+      Filip Wasil
+      Thatcher Ulrich
+      github:poppolopoppo
+      Patrick Boettcher
+      github:xeekworx
+      Cap Petschulat
+      Simon Rodriguez
+      Ivan Tikhonov
+      github:ignotion
+      Adam Schackart
+
+LICENSE
+
+  See end of file for license information.
+
+*/
+
+#ifndef INCLUDE_STB_IMAGE_WRITE_H
+#define INCLUDE_STB_IMAGE_WRITE_H
+
+#include <stdlib.h>
+
+// if STB_IMAGE_WRITE_STATIC causes problems, try defining STBIWDEF to 'inline' or 'static inline'
+#ifndef STBIWDEF
+#ifdef STB_IMAGE_WRITE_STATIC
+#define STBIWDEF  static
+#else
+#ifdef __cplusplus
+#define STBIWDEF  extern "C"
+#else
+#define STBIWDEF  extern
+#endif
+#endif
+#endif
+
+#ifndef STB_IMAGE_WRITE_STATIC  // C++ forbids static forward declarations
+extern int stbi_write_tga_with_rle;
+extern int stbi_write_png_compression_level;
+extern int stbi_write_force_png_filter;
+#endif
+
+#ifndef STBI_WRITE_NO_STDIO
+STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const void  *data, int stride_in_bytes);
+STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp, const void  *data);
+STBIWDEF int stbi_write_tga(char const *filename, int w, int h, int comp, const void  *data);
+STBIWDEF int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data);
+STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void  *data, int quality);
+
+#ifdef STBI_WINDOWS_UTF8
+STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input);
+#endif
+#endif
+
+typedef void stbi_write_func(void *context, void *data, int size);
+
+STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void  *data, int stride_in_bytes);
+STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void  *data);
+STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void  *data);
+STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data);
+STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void  *data, int quality);
+
+STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean);
+
+#endif//INCLUDE_STB_IMAGE_WRITE_H
+
+#ifdef STB_IMAGE_WRITE_IMPLEMENTATION
+
+#ifdef _WIN32
+   #ifndef _CRT_SECURE_NO_WARNINGS
+   #define _CRT_SECURE_NO_WARNINGS
+   #endif
+   #ifndef _CRT_NONSTDC_NO_DEPRECATE
+   #define _CRT_NONSTDC_NO_DEPRECATE
+   #endif
+#endif
+
+#ifndef STBI_WRITE_NO_STDIO
+#include <stdio.h>
+#endif // STBI_WRITE_NO_STDIO
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#if defined(STBIW_MALLOC) && defined(STBIW_FREE) && (defined(STBIW_REALLOC) || defined(STBIW_REALLOC_SIZED))
+// ok
+#elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) && !defined(STBIW_REALLOC) && !defined(STBIW_REALLOC_SIZED)
+// ok
+#else
+#error "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC (or STBIW_REALLOC_SIZED)."
+#endif
+
+#ifndef STBIW_MALLOC
+#define STBIW_MALLOC(sz)        malloc(sz)
+#define STBIW_REALLOC(p,newsz)  realloc(p,newsz)
+#define STBIW_FREE(p)           free(p)
+#endif
+
+#ifndef STBIW_REALLOC_SIZED
+#define STBIW_REALLOC_SIZED(p,oldsz,newsz) STBIW_REALLOC(p,newsz)
+#endif
+
+
+#ifndef STBIW_MEMMOVE
+#define STBIW_MEMMOVE(a,b,sz) memmove(a,b,sz)
+#endif
+
+
+#ifndef STBIW_ASSERT
+#include <assert.h>
+#define STBIW_ASSERT(x) assert(x)
+#endif
+
+#define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff)
+
+#ifdef STB_IMAGE_WRITE_STATIC
+static int stbi_write_png_compression_level = 8;
+static int stbi_write_tga_with_rle = 1;
+static int stbi_write_force_png_filter = -1;
+#else
+int stbi_write_png_compression_level = 8;
+int stbi_write_tga_with_rle = 1;
+int stbi_write_force_png_filter = -1;
+#endif
+
+static int stbi__flip_vertically_on_write = 0;
+
+STBIWDEF void stbi_flip_vertically_on_write(int flag)
+{
+   stbi__flip_vertically_on_write = flag;
+}
+
+typedef struct
+{
+   stbi_write_func *func;
+   void *context;
+   unsigned char buffer[64];
+   int buf_used;
+} stbi__write_context;
+
+// initialize a callback-based context
+static void stbi__start_write_callbacks(stbi__write_context *s, stbi_write_func *c, void *context)
+{
+   s->func    = c;
+   s->context = context;
+}
+
+#ifndef STBI_WRITE_NO_STDIO
+
+static void stbi__stdio_write(void *context, void *data, int size)
+{
+   fwrite(data,1,size,(FILE*) context);
+}
+
+#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
+#ifdef __cplusplus
+#define STBIW_EXTERN extern "C"
+#else
+#define STBIW_EXTERN extern
+#endif
+STBIW_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide);
+STBIW_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide, char *str, int cbmb, const char *defchar, int *used_default);
+
+STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input)
+{
+       return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL);
+}
+#endif
+
+static FILE *stbiw__fopen(char const *filename, char const *mode)
+{
+   FILE *f;
+#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
+   wchar_t wMode[64];
+   wchar_t wFilename[1024];
+       if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename)))
+      return 0;
+
+       if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode)))
+      return 0;
+
+#if _MSC_VER >= 1400
+       if (0 != _wfopen_s(&f, wFilename, wMode))
+               f = 0;
+#else
+   f = _wfopen(wFilename, wMode);
+#endif
+
+#elif defined(_MSC_VER) && _MSC_VER >= 1400
+   if (0 != fopen_s(&f, filename, mode))
+      f=0;
+#else
+   f = fopen(filename, mode);
+#endif
+   return f;
+}
+
+static int stbi__start_write_file(stbi__write_context *s, const char *filename)
+{
+   FILE *f = stbiw__fopen(filename, "wb");
+   stbi__start_write_callbacks(s, stbi__stdio_write, (void *) f);
+   return f != NULL;
+}
+
+static void stbi__end_write_file(stbi__write_context *s)
+{
+   fclose((FILE *)s->context);
+}
+
+#endif // !STBI_WRITE_NO_STDIO
+
+typedef unsigned int stbiw_uint32;
+typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1];
+
+static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_list v)
+{
+   while (*fmt) {
+      switch (*fmt++) {
+         case ' ': break;
+         case '1': { unsigned char x = STBIW_UCHAR(va_arg(v, int));
+                     s->func(s->context,&x,1);
+                     break; }
+         case '2': { int x = va_arg(v,int);
+                     unsigned char b[2];
+                     b[0] = STBIW_UCHAR(x);
+                     b[1] = STBIW_UCHAR(x>>8);
+                     s->func(s->context,b,2);
+                     break; }
+         case '4': { stbiw_uint32 x = va_arg(v,int);
+                     unsigned char b[4];
+                     b[0]=STBIW_UCHAR(x);
+                     b[1]=STBIW_UCHAR(x>>8);
+                     b[2]=STBIW_UCHAR(x>>16);
+                     b[3]=STBIW_UCHAR(x>>24);
+                     s->func(s->context,b,4);
+                     break; }
+         default:
+            STBIW_ASSERT(0);
+            return;
+      }
+   }
+}
+
+static void stbiw__writef(stbi__write_context *s, const char *fmt, ...)
+{
+   va_list v;
+   va_start(v, fmt);
+   stbiw__writefv(s, fmt, v);
+   va_end(v);
+}
+
+static void stbiw__write_flush(stbi__write_context *s)
+{
+   if (s->buf_used) {
+      s->func(s->context, &s->buffer, s->buf_used);
+      s->buf_used = 0;
+   }
+}
+
+static void stbiw__putc(stbi__write_context *s, unsigned char c)
+{
+   s->func(s->context, &c, 1);
+}
+
+static void stbiw__write1(stbi__write_context *s, unsigned char a)
+{
+   if (s->buf_used + 1 > sizeof(s->buffer))
+      stbiw__write_flush(s);
+   s->buffer[s->buf_used++] = a;
+}
+
+static void stbiw__write3(stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c)
+{
+   int n;
+   if (s->buf_used + 3 > sizeof(s->buffer))
+      stbiw__write_flush(s);
+   n = s->buf_used;
+   s->buf_used = n+3;
+   s->buffer[n+0] = a;
+   s->buffer[n+1] = b;
+   s->buffer[n+2] = c;
+}
+
+static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp, int write_alpha, int expand_mono, unsigned char *d)
+{
+   unsigned char bg[3] = { 255, 0, 255}, px[3];
+   int k;
+
+   if (write_alpha < 0)
+      stbiw__write1(s, d[comp - 1]);
+
+   switch (comp) {
+      case 2: // 2 pixels = mono + alpha, alpha is written separately, so same as 1-channel case
+      case 1:
+         if (expand_mono)
+            stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp
+         else
+            stbiw__write1(s, d[0]);  // monochrome TGA
+         break;
+      case 4:
+         if (!write_alpha) {
+            // composite against pink background
+            for (k = 0; k < 3; ++k)
+               px[k] = bg[k] + ((d[k] - bg[k]) * d[3]) / 255;
+            stbiw__write3(s, px[1 - rgb_dir], px[1], px[1 + rgb_dir]);
+            break;
+         }
+         /* FALLTHROUGH */
+      case 3:
+         stbiw__write3(s, d[1 - rgb_dir], d[1], d[1 + rgb_dir]);
+         break;
+   }
+   if (write_alpha > 0)
+      stbiw__write1(s, d[comp - 1]);
+}
+
+static void stbiw__write_pixels(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad, int expand_mono)
+{
+   stbiw_uint32 zero = 0;
+   int i,j, j_end;
+
+   if (y <= 0)
+      return;
+
+   if (stbi__flip_vertically_on_write)
+      vdir *= -1;
+
+   if (vdir < 0) {
+      j_end = -1; j = y-1;
+   } else {
+      j_end =  y; j = 0;
+   }
+
+   for (; j != j_end; j += vdir) {
+      for (i=0; i < x; ++i) {
+         unsigned char *d = (unsigned char *) data + (j*x+i)*comp;
+         stbiw__write_pixel(s, rgb_dir, comp, write_alpha, expand_mono, d);
+      }
+      stbiw__write_flush(s);
+      s->func(s->context, &zero, scanline_pad);
+   }
+}
+
+static int stbiw__outfile(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, int expand_mono, void *data, int alpha, int pad, const char *fmt, ...)
+{
+   if (y < 0 || x < 0) {
+      return 0;
+   } else {
+      va_list v;
+      va_start(v, fmt);
+      stbiw__writefv(s, fmt, v);
+      va_end(v);
+      stbiw__write_pixels(s,rgb_dir,vdir,x,y,comp,data,alpha,pad, expand_mono);
+      return 1;
+   }
+}
+
+static int stbi_write_bmp_core(stbi__write_context *s, int x, int y, int comp, const void *data)
+{
+   int pad = (-x*3) & 3;
+   return stbiw__outfile(s,-1,-1,x,y,comp,1,(void *) data,0,pad,
+           "11 4 22 4" "4 44 22 444444",
+           'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40,  // file header
+            40, x,y, 1,24, 0,0,0,0,0,0);             // bitmap header
+}
+
+STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data)
+{
+   stbi__write_context s = { 0 };
+   stbi__start_write_callbacks(&s, func, context);
+   return stbi_write_bmp_core(&s, x, y, comp, data);
+}
+
+#ifndef STBI_WRITE_NO_STDIO
+STBIWDEF int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data)
+{
+   stbi__write_context s = { 0 };
+   if (stbi__start_write_file(&s,filename)) {
+      int r = stbi_write_bmp_core(&s, x, y, comp, data);
+      stbi__end_write_file(&s);
+      return r;
+   } else
+      return 0;
+}
+#endif //!STBI_WRITE_NO_STDIO
+
+static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, void *data)
+{
+   int has_alpha = (comp == 2 || comp == 4);
+   int colorbytes = has_alpha ? comp-1 : comp;
+   int format = colorbytes < 2 ? 3 : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3
+
+   if (y < 0 || x < 0)
+      return 0;
+
+   if (!stbi_write_tga_with_rle) {
+      return stbiw__outfile(s, -1, -1, x, y, comp, 0, (void *) data, has_alpha, 0,
+         "111 221 2222 11", 0, 0, format, 0, 0, 0, 0, 0, x, y, (colorbytes + has_alpha) * 8, has_alpha * 8);
+   } else {
+      int i,j,k;
+      int jend, jdir;
+
+      stbiw__writef(s, "111 221 2222 11", 0,0,format+8, 0,0,0, 0,0,x,y, (colorbytes + has_alpha) * 8, has_alpha * 8);
+
+      if (stbi__flip_vertically_on_write) {
+         j = 0;
+         jend = y;
+         jdir = 1;
+      } else {
+         j = y-1;
+         jend = -1;
+         jdir = -1;
+      }
+      for (; j != jend; j += jdir) {
+         unsigned char *row = (unsigned char *) data + j * x * comp;
+         int len;
+
+         for (i = 0; i < x; i += len) {
+            unsigned char *begin = row + i * comp;
+            int diff = 1;
+            len = 1;
+
+            if (i < x - 1) {
+               ++len;
+               diff = memcmp(begin, row + (i + 1) * comp, comp);
+               if (diff) {
+                  const unsigned char *prev = begin;
+                  for (k = i + 2; k < x && len < 128; ++k) {
+                     if (memcmp(prev, row + k * comp, comp)) {
+                        prev += comp;
+                        ++len;
+                     } else {
+                        --len;
+                        break;
+                     }
+                  }
+               } else {
+                  for (k = i + 2; k < x && len < 128; ++k) {
+                     if (!memcmp(begin, row + k * comp, comp)) {
+                        ++len;
+                     } else {
+                        break;
+                     }
+                  }
+               }
+            }
+
+            if (diff) {
+               unsigned char header = STBIW_UCHAR(len - 1);
+               stbiw__write1(s, header);
+               for (k = 0; k < len; ++k) {
+                  stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin + k * comp);
+               }
+            } else {
+               unsigned char header = STBIW_UCHAR(len - 129);
+               stbiw__write1(s, header);
+               stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin);
+            }
+         }
+      }
+      stbiw__write_flush(s);
+   }
+   return 1;
+}
+
+STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data)
+{
+   stbi__write_context s = { 0 };
+   stbi__start_write_callbacks(&s, func, context);
+   return stbi_write_tga_core(&s, x, y, comp, (void *) data);
+}
+
+#ifndef STBI_WRITE_NO_STDIO
+STBIWDEF int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data)
+{
+   stbi__write_context s = { 0 };
+   if (stbi__start_write_file(&s,filename)) {
+      int r = stbi_write_tga_core(&s, x, y, comp, (void *) data);
+      stbi__end_write_file(&s);
+      return r;
+   } else
+      return 0;
+}
+#endif
+
+// *************************************************************************************************
+// Radiance RGBE HDR writer
+// by Baldur Karlsson
+
+#define stbiw__max(a, b)  ((a) > (b) ? (a) : (b))
+
+static void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear)
+{
+   int exponent;
+   float maxcomp = stbiw__max(linear[0], stbiw__max(linear[1], linear[2]));
+
+   if (maxcomp < 1e-32f) {
+      rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0;
+   } else {
+      float normalize = (float) frexp(maxcomp, &exponent) * 256.0f/maxcomp;
+
+      rgbe[0] = (unsigned char)(linear[0] * normalize);
+      rgbe[1] = (unsigned char)(linear[1] * normalize);
+      rgbe[2] = (unsigned char)(linear[2] * normalize);
+      rgbe[3] = (unsigned char)(exponent + 128);
+   }
+}
+
+static void stbiw__write_run_data(stbi__write_context *s, int length, unsigned char databyte)
+{
+   unsigned char lengthbyte = STBIW_UCHAR(length+128);
+   STBIW_ASSERT(length+128 <= 255);
+   s->func(s->context, &lengthbyte, 1);
+   s->func(s->context, &databyte, 1);
+}
+
+static void stbiw__write_dump_data(stbi__write_context *s, int length, unsigned char *data)
+{
+   unsigned char lengthbyte = STBIW_UCHAR(length);
+   STBIW_ASSERT(length <= 128); // inconsistent with spec but consistent with official code
+   s->func(s->context, &lengthbyte, 1);
+   s->func(s->context, data, length);
+}
+
+static void stbiw__write_hdr_scanline(stbi__write_context *s, int width, int ncomp, unsigned char *scratch, float *scanline)
+{
+   unsigned char scanlineheader[4] = { 2, 2, 0, 0 };
+   unsigned char rgbe[4];
+   float linear[3];
+   int x;
+
+   scanlineheader[2] = (width&0xff00)>>8;
+   scanlineheader[3] = (width&0x00ff);
+
+   /* skip RLE for images too small or large */
+   if (width < 8 || width >= 32768) {
+      for (x=0; x < width; x++) {
+         switch (ncomp) {
+            case 4: /* fallthrough */
+            case 3: linear[2] = scanline[x*ncomp + 2];
+                    linear[1] = scanline[x*ncomp + 1];
+                    linear[0] = scanline[x*ncomp + 0];
+                    break;
+            default:
+                    linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0];
+                    break;
+         }
+         stbiw__linear_to_rgbe(rgbe, linear);
+         s->func(s->context, rgbe, 4);
+      }
+   } else {
+      int c,r;
+      /* encode into scratch buffer */
+      for (x=0; x < width; x++) {
+         switch(ncomp) {
+            case 4: /* fallthrough */
+            case 3: linear[2] = scanline[x*ncomp + 2];
+                    linear[1] = scanline[x*ncomp + 1];
+                    linear[0] = scanline[x*ncomp + 0];
+                    break;
+            default:
+                    linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0];
+                    break;
+         }
+         stbiw__linear_to_rgbe(rgbe, linear);
+         scratch[x + width*0] = rgbe[0];
+         scratch[x + width*1] = rgbe[1];
+         scratch[x + width*2] = rgbe[2];
+         scratch[x + width*3] = rgbe[3];
+      }
+
+      s->func(s->context, scanlineheader, 4);
+
+      /* RLE each component separately */
+      for (c=0; c < 4; c++) {
+         unsigned char *comp = &scratch[width*c];
+
+         x = 0;
+         while (x < width) {
+            // find first run
+            r = x;
+            while (r+2 < width) {
+               if (comp[r] == comp[r+1] && comp[r] == comp[r+2])
+                  break;
+               ++r;
+            }
+            if (r+2 >= width)
+               r = width;
+            // dump up to first run
+            while (x < r) {
+               int len = r-x;
+               if (len > 128) len = 128;
+               stbiw__write_dump_data(s, len, &comp[x]);
+               x += len;
+            }
+            // if there's a run, output it
+            if (r+2 < width) { // same test as what we break out of in search loop, so only true if we break'd
+               // find next byte after run
+               while (r < width && comp[r] == comp[x])
+                  ++r;
+               // output run up to r
+               while (x < r) {
+                  int len = r-x;
+                  if (len > 127) len = 127;
+                  stbiw__write_run_data(s, len, comp[x]);
+                  x += len;
+               }
+            }
+         }
+      }
+   }
+}
+
+static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp, float *data)
+{
+   if (y <= 0 || x <= 0 || data == NULL)
+      return 0;
+   else {
+      // Each component is stored separately. Allocate scratch space for full output scanline.
+      unsigned char *scratch = (unsigned char *) STBIW_MALLOC(x*4);
+      int i, len;
+      char buffer[128];
+      char header[] = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n";
+      s->func(s->context, header, sizeof(header)-1);
+
+#ifdef __STDC_WANT_SECURE_LIB__
+      len = sprintf_s(buffer, sizeof(buffer), "EXPOSURE=          1.0000000000000\n\n-Y %d +X %d\n", y, x);
+#else
+      len = sprintf(buffer, "EXPOSURE=          1.0000000000000\n\n-Y %d +X %d\n", y, x);
+#endif
+      s->func(s->context, buffer, len);
+
+      for(i=0; i < y; i++)
+         stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*x*(stbi__flip_vertically_on_write ? y-1-i : i));
+      STBIW_FREE(scratch);
+      return 1;
+   }
+}
+
+STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const float *data)
+{
+   stbi__write_context s = { 0 };
+   stbi__start_write_callbacks(&s, func, context);
+   return stbi_write_hdr_core(&s, x, y, comp, (float *) data);
+}
+
+#ifndef STBI_WRITE_NO_STDIO
+STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data)
+{
+   stbi__write_context s = { 0 };
+   if (stbi__start_write_file(&s,filename)) {
+      int r = stbi_write_hdr_core(&s, x, y, comp, (float *) data);
+      stbi__end_write_file(&s);
+      return r;
+   } else
+      return 0;
+}
+#endif // STBI_WRITE_NO_STDIO
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// PNG writer
+//
+
+#ifndef STBIW_ZLIB_COMPRESS
+// stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size()
+#define stbiw__sbraw(a) ((int *) (void *) (a) - 2)
+#define stbiw__sbm(a)   stbiw__sbraw(a)[0]
+#define stbiw__sbn(a)   stbiw__sbraw(a)[1]
+
+#define stbiw__sbneedgrow(a,n)  ((a)==0 || stbiw__sbn(a)+n >= stbiw__sbm(a))
+#define stbiw__sbmaybegrow(a,n) (stbiw__sbneedgrow(a,(n)) ? stbiw__sbgrow(a,n) : 0)
+#define stbiw__sbgrow(a,n)  stbiw__sbgrowf((void **) &(a), (n), sizeof(*(a)))
+
+#define stbiw__sbpush(a, v)      (stbiw__sbmaybegrow(a,1), (a)[stbiw__sbn(a)++] = (v))
+#define stbiw__sbcount(a)        ((a) ? stbiw__sbn(a) : 0)
+#define stbiw__sbfree(a)         ((a) ? STBIW_FREE(stbiw__sbraw(a)),0 : 0)
+
+static void *stbiw__sbgrowf(void **arr, int increment, int itemsize)
+{
+   int m = *arr ? 2*stbiw__sbm(*arr)+increment : increment+1;
+   void *p = STBIW_REALLOC_SIZED(*arr ? stbiw__sbraw(*arr) : 0, *arr ? (stbiw__sbm(*arr)*itemsize + sizeof(int)*2) : 0, itemsize * m + sizeof(int)*2);
+   STBIW_ASSERT(p);
+   if (p) {
+      if (!*arr) ((int *) p)[1] = 0;
+      *arr = (void *) ((int *) p + 2);
+      stbiw__sbm(*arr) = m;
+   }
+   return *arr;
+}
+
+static unsigned char *stbiw__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount)
+{
+   while (*bitcount >= 8) {
+      stbiw__sbpush(data, STBIW_UCHAR(*bitbuffer));
+      *bitbuffer >>= 8;
+      *bitcount -= 8;
+   }
+   return data;
+}
+
+static int stbiw__zlib_bitrev(int code, int codebits)
+{
+   int res=0;
+   while (codebits--) {
+      res = (res << 1) | (code & 1);
+      code >>= 1;
+   }
+   return res;
+}
+
+static unsigned int stbiw__zlib_countm(unsigned char *a, unsigned char *b, int limit)
+{
+   int i;
+   for (i=0; i < limit && i < 258; ++i)
+      if (a[i] != b[i]) break;
+   return i;
+}
+
+static unsigned int stbiw__zhash(unsigned char *data)
+{
+   stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16);
+   hash ^= hash << 3;
+   hash += hash >> 5;
+   hash ^= hash << 4;
+   hash += hash >> 17;
+   hash ^= hash << 25;
+   hash += hash >> 6;
+   return hash;
+}
+
+#define stbiw__zlib_flush() (out = stbiw__zlib_flushf(out, &bitbuf, &bitcount))
+#define stbiw__zlib_add(code,codebits) \
+      (bitbuf |= (code) << bitcount, bitcount += (codebits), stbiw__zlib_flush())
+#define stbiw__zlib_huffa(b,c)  stbiw__zlib_add(stbiw__zlib_bitrev(b,c),c)
+// default huffman tables
+#define stbiw__zlib_huff1(n)  stbiw__zlib_huffa(0x30 + (n), 8)
+#define stbiw__zlib_huff2(n)  stbiw__zlib_huffa(0x190 + (n)-144, 9)
+#define stbiw__zlib_huff3(n)  stbiw__zlib_huffa(0 + (n)-256,7)
+#define stbiw__zlib_huff4(n)  stbiw__zlib_huffa(0xc0 + (n)-280,8)
+#define stbiw__zlib_huff(n)  ((n) <= 143 ? stbiw__zlib_huff1(n) : (n) <= 255 ? stbiw__zlib_huff2(n) : (n) <= 279 ? stbiw__zlib_huff3(n) : stbiw__zlib_huff4(n))
+#define stbiw__zlib_huffb(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : stbiw__zlib_huff2(n))
+
+#define stbiw__ZHASH   16384
+
+#endif // STBIW_ZLIB_COMPRESS
+
+STBIWDEF unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality)
+{
+#ifdef STBIW_ZLIB_COMPRESS
+   // user provided a zlib compress implementation, use that
+   return STBIW_ZLIB_COMPRESS(data, data_len, out_len, quality);
+#else // use builtin
+   static unsigned short lengthc[] = { 3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258, 259 };
+   static unsigned char  lengtheb[]= { 0,0,0,0,0,0,0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4,  4,  5,  5,  5,  5,  0 };
+   static unsigned short distc[]   = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577, 32768 };
+   static unsigned char  disteb[]  = { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13 };
+   unsigned int bitbuf=0;
+   int i,j, bitcount=0;
+   unsigned char *out = NULL;
+   unsigned char ***hash_table = (unsigned char***) STBIW_MALLOC(stbiw__ZHASH * sizeof(unsigned char**));
+   if (hash_table == NULL)
+      return NULL;
+   if (quality < 5) quality = 5;
+
+   stbiw__sbpush(out, 0x78);   // DEFLATE 32K window
+   stbiw__sbpush(out, 0x5e);   // FLEVEL = 1
+   stbiw__zlib_add(1,1);  // BFINAL = 1
+   stbiw__zlib_add(1,2);  // BTYPE = 1 -- fixed huffman
+
+   for (i=0; i < stbiw__ZHASH; ++i)
+      hash_table[i] = NULL;
+
+   i=0;
+   while (i < data_len-3) {
+      // hash next 3 bytes of data to be compressed
+      int h = stbiw__zhash(data+i)&(stbiw__ZHASH-1), best=3;
+      unsigned char *bestloc = 0;
+      unsigned char **hlist = hash_table[h];
+      int n = stbiw__sbcount(hlist);
+      for (j=0; j < n; ++j) {
+         if (hlist[j]-data > i-32768) { // if entry lies within window
+            int d = stbiw__zlib_countm(hlist[j], data+i, data_len-i);
+            if (d >= best) { best=d; bestloc=hlist[j]; }
+         }
+      }
+      // when hash table entry is too long, delete half the entries
+      if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2*quality) {
+         STBIW_MEMMOVE(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality);
+         stbiw__sbn(hash_table[h]) = quality;
+      }
+      stbiw__sbpush(hash_table[h],data+i);
+
+      if (bestloc) {
+         // "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal
+         h = stbiw__zhash(data+i+1)&(stbiw__ZHASH-1);
+         hlist = hash_table[h];
+         n = stbiw__sbcount(hlist);
+         for (j=0; j < n; ++j) {
+            if (hlist[j]-data > i-32767) {
+               int e = stbiw__zlib_countm(hlist[j], data+i+1, data_len-i-1);
+               if (e > best) { // if next match is better, bail on current match
+                  bestloc = NULL;
+                  break;
+               }
+            }
+         }
+      }
+
+      if (bestloc) {
+         int d = (int) (data+i - bestloc); // distance back
+         STBIW_ASSERT(d <= 32767 && best <= 258);
+         for (j=0; best > lengthc[j+1]-1; ++j);
+         stbiw__zlib_huff(j+257);
+         if (lengtheb[j]) stbiw__zlib_add(best - lengthc[j], lengtheb[j]);
+         for (j=0; d > distc[j+1]-1; ++j);
+         stbiw__zlib_add(stbiw__zlib_bitrev(j,5),5);
+         if (disteb[j]) stbiw__zlib_add(d - distc[j], disteb[j]);
+         i += best;
+      } else {
+         stbiw__zlib_huffb(data[i]);
+         ++i;
+      }
+   }
+   // write out final bytes
+   for (;i < data_len; ++i)
+      stbiw__zlib_huffb(data[i]);
+   stbiw__zlib_huff(256); // end of block
+   // pad with 0 bits to byte boundary
+   while (bitcount)
+      stbiw__zlib_add(0,1);
+
+   for (i=0; i < stbiw__ZHASH; ++i)
+      (void) stbiw__sbfree(hash_table[i]);
+   STBIW_FREE(hash_table);
+
+   {
+      // compute adler32 on input
+      unsigned int s1=1, s2=0;
+      int blocklen = (int) (data_len % 5552);
+      j=0;
+      while (j < data_len) {
+         for (i=0; i < blocklen; ++i) { s1 += data[j+i]; s2 += s1; }
+         s1 %= 65521; s2 %= 65521;
+         j += blocklen;
+         blocklen = 5552;
+      }
+      stbiw__sbpush(out, STBIW_UCHAR(s2 >> 8));
+      stbiw__sbpush(out, STBIW_UCHAR(s2));
+      stbiw__sbpush(out, STBIW_UCHAR(s1 >> 8));
+      stbiw__sbpush(out, STBIW_UCHAR(s1));
+   }
+   *out_len = stbiw__sbn(out);
+   // make returned pointer freeable
+   STBIW_MEMMOVE(stbiw__sbraw(out), out, *out_len);
+   return (unsigned char *) stbiw__sbraw(out);
+#endif // STBIW_ZLIB_COMPRESS
+}
+
+static unsigned int stbiw__crc32(unsigned char *buffer, int len)
+{
+#ifdef STBIW_CRC32
+    return STBIW_CRC32(buffer, len);
+#else
+   static unsigned int crc_table[256] =
+   {
+      0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
+      0x0eDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
+      0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
+      0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
+      0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
+      0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
+      0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
+      0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
+      0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
+      0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
+      0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
+      0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
+      0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
+      0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
+      0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
+      0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
+      0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
+      0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
+      0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
+      0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
+      0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
+      0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
+      0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
+      0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
+      0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
+      0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
+      0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
+      0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
+      0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
+      0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
+      0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
+      0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
+   };
+
+   unsigned int crc = ~0u;
+   int i;
+   for (i=0; i < len; ++i)
+      crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)];
+   return ~crc;
+#endif
+}
+
+#define stbiw__wpng4(o,a,b,c,d) ((o)[0]=STBIW_UCHAR(a),(o)[1]=STBIW_UCHAR(b),(o)[2]=STBIW_UCHAR(c),(o)[3]=STBIW_UCHAR(d),(o)+=4)
+#define stbiw__wp32(data,v) stbiw__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v));
+#define stbiw__wptag(data,s) stbiw__wpng4(data, s[0],s[1],s[2],s[3])
+
+static void stbiw__wpcrc(unsigned char **data, int len)
+{
+   unsigned int crc = stbiw__crc32(*data - len - 4, len+4);
+   stbiw__wp32(*data, crc);
+}
+
+static unsigned char stbiw__paeth(int a, int b, int c)
+{
+   int p = a + b - c, pa = abs(p-a), pb = abs(p-b), pc = abs(p-c);
+   if (pa <= pb && pa <= pc) return STBIW_UCHAR(a);
+   if (pb <= pc) return STBIW_UCHAR(b);
+   return STBIW_UCHAR(c);
+}
+
+// @OPTIMIZE: provide an option that always forces left-predict or paeth predict
+static void stbiw__encode_png_line(unsigned char *pixels, int stride_bytes, int width, int height, int y, int n, int filter_type, signed char *line_buffer)
+{
+   static int mapping[] = { 0,1,2,3,4 };
+   static int firstmap[] = { 0,1,0,5,6 };
+   int *mymap = (y != 0) ? mapping : firstmap;
+   int i;
+   int type = mymap[filter_type];
+   unsigned char *z = pixels + stride_bytes * (stbi__flip_vertically_on_write ? height-1-y : y);
+   int signed_stride = stbi__flip_vertically_on_write ? -stride_bytes : stride_bytes;
+
+   if (type==0) {
+      memcpy(line_buffer, z, width*n);
+      return;
+   }
+
+   // first loop isn't optimized since it's just one pixel
+   for (i = 0; i < n; ++i) {
+      switch (type) {
+         case 1: line_buffer[i] = z[i]; break;
+         case 2: line_buffer[i] = z[i] - z[i-signed_stride]; break;
+         case 3: line_buffer[i] = z[i] - (z[i-signed_stride]>>1); break;
+         case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-signed_stride],0)); break;
+         case 5: line_buffer[i] = z[i]; break;
+         case 6: line_buffer[i] = z[i]; break;
+      }
+   }
+   switch (type) {
+      case 1: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - z[i-n]; break;
+      case 2: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - z[i-signed_stride]; break;
+      case 3: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - ((z[i-n] + z[i-signed_stride])>>1); break;
+      case 4: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - stbiw__paeth(z[i-n], z[i-signed_stride], z[i-signed_stride-n]); break;
+      case 5: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - (z[i-n]>>1); break;
+      case 6: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break;
+   }
+}
+
+STBIWDEF unsigned char *stbi_write_png_to_mem(const unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len)
+{
+   int force_filter = stbi_write_force_png_filter;
+   int ctype[5] = { -1, 0, 4, 2, 6 };
+   unsigned char sig[8] = { 137,80,78,71,13,10,26,10 };
+   unsigned char *out,*o, *filt, *zlib;
+   signed char *line_buffer;
+   int j,zlen;
+
+   if (stride_bytes == 0)
+      stride_bytes = x * n;
+
+   if (force_filter >= 5) {
+      force_filter = -1;
+   }
+
+   filt = (unsigned char *) STBIW_MALLOC((x*n+1) * y); if (!filt) return 0;
+   line_buffer = (signed char *) STBIW_MALLOC(x * n); if (!line_buffer) { STBIW_FREE(filt); return 0; }
+   for (j=0; j < y; ++j) {
+      int filter_type;
+      if (force_filter > -1) {
+         filter_type = force_filter;
+         stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, force_filter, line_buffer);
+      } else { // Estimate the best filter by running through all of them:
+         int best_filter = 0, best_filter_val = 0x7fffffff, est, i;
+         for (filter_type = 0; filter_type < 5; filter_type++) {
+            stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, filter_type, line_buffer);
+
+            // Estimate the entropy of the line using this filter; the less, the better.
+            est = 0;
+            for (i = 0; i < x*n; ++i) {
+               est += abs((signed char) line_buffer[i]);
+            }
+            if (est < best_filter_val) {
+               best_filter_val = est;
+               best_filter = filter_type;
+            }
+         }
+         if (filter_type != best_filter) {  // If the last iteration already got us the best filter, don't redo it
+            stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, best_filter, line_buffer);
+            filter_type = best_filter;
+         }
+      }
+      // when we get here, filter_type contains the filter type, and line_buffer contains the data
+      filt[j*(x*n+1)] = (unsigned char) filter_type;
+      STBIW_MEMMOVE(filt+j*(x*n+1)+1, line_buffer, x*n);
+   }
+   STBIW_FREE(line_buffer);
+   zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, stbi_write_png_compression_level);
+   STBIW_FREE(filt);
+   if (!zlib) return 0;
+
+   // each tag requires 12 bytes of overhead
+   out = (unsigned char *) STBIW_MALLOC(8 + 12+13 + 12+zlen + 12);
+   if (!out) return 0;
+   *out_len = 8 + 12+13 + 12+zlen + 12;
+
+   o=out;
+   STBIW_MEMMOVE(o,sig,8); o+= 8;
+   stbiw__wp32(o, 13); // header length
+   stbiw__wptag(o, "IHDR");
+   stbiw__wp32(o, x);
+   stbiw__wp32(o, y);
+   *o++ = 8;
+   *o++ = STBIW_UCHAR(ctype[n]);
+   *o++ = 0;
+   *o++ = 0;
+   *o++ = 0;
+   stbiw__wpcrc(&o,13);
+
+   stbiw__wp32(o, zlen);
+   stbiw__wptag(o, "IDAT");
+   STBIW_MEMMOVE(o, zlib, zlen);
+   o += zlen;
+   STBIW_FREE(zlib);
+   stbiw__wpcrc(&o, zlen);
+
+   stbiw__wp32(o,0);
+   stbiw__wptag(o, "IEND");
+   stbiw__wpcrc(&o,0);
+
+   STBIW_ASSERT(o == out + *out_len);
+
+   return out;
+}
+
+#ifndef STBI_WRITE_NO_STDIO
+STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes)
+{
+   FILE *f;
+   int len;
+   unsigned char *png = stbi_write_png_to_mem((const unsigned char *) data, stride_bytes, x, y, comp, &len);
+   if (png == NULL) return 0;
+
+   f = stbiw__fopen(filename, "wb");
+   if (!f) { STBIW_FREE(png); return 0; }
+   fwrite(png, 1, len, f);
+   fclose(f);
+   STBIW_FREE(png);
+   return 1;
+}
+#endif
+
+STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int stride_bytes)
+{
+   int len;
+   unsigned char *png = stbi_write_png_to_mem((const unsigned char *) data, stride_bytes, x, y, comp, &len);
+   if (png == NULL) return 0;
+   func(context, png, len);
+   STBIW_FREE(png);
+   return 1;
+}
+
+
+/* ***************************************************************************
+ *
+ * JPEG writer
+ *
+ * This is based on Jon Olick's jo_jpeg.cpp:
+ * public domain Simple, Minimalistic JPEG writer - http://www.jonolick.com/code.html
+ */
+
+static const unsigned char stbiw__jpg_ZigZag[] = { 0,1,5,6,14,15,27,28,2,4,7,13,16,26,29,42,3,8,12,17,25,30,41,43,9,11,18,
+      24,31,40,44,53,10,19,23,32,39,45,52,54,20,22,33,38,46,51,55,60,21,34,37,47,50,56,59,61,35,36,48,49,57,58,62,63 };
+
+static void stbiw__jpg_writeBits(stbi__write_context *s, int *bitBufP, int *bitCntP, const unsigned short *bs) {
+   int bitBuf = *bitBufP, bitCnt = *bitCntP;
+   bitCnt += bs[1];
+   bitBuf |= bs[0] << (24 - bitCnt);
+   while(bitCnt >= 8) {
+      unsigned char c = (bitBuf >> 16) & 255;
+      stbiw__putc(s, c);
+      if(c == 255) {
+         stbiw__putc(s, 0);
+      }
+      bitBuf <<= 8;
+      bitCnt -= 8;
+   }
+   *bitBufP = bitBuf;
+   *bitCntP = bitCnt;
+}
+
+static void stbiw__jpg_DCT(float *d0p, float *d1p, float *d2p, float *d3p, float *d4p, float *d5p, float *d6p, float *d7p) {
+   float d0 = *d0p, d1 = *d1p, d2 = *d2p, d3 = *d3p, d4 = *d4p, d5 = *d5p, d6 = *d6p, d7 = *d7p;
+   float z1, z2, z3, z4, z5, z11, z13;
+
+   float tmp0 = d0 + d7;
+   float tmp7 = d0 - d7;
+   float tmp1 = d1 + d6;
+   float tmp6 = d1 - d6;
+   float tmp2 = d2 + d5;
+   float tmp5 = d2 - d5;
+   float tmp3 = d3 + d4;
+   float tmp4 = d3 - d4;
+
+   // Even part
+   float tmp10 = tmp0 + tmp3;   // phase 2
+   float tmp13 = tmp0 - tmp3;
+   float tmp11 = tmp1 + tmp2;
+   float tmp12 = tmp1 - tmp2;
+
+   d0 = tmp10 + tmp11;       // phase 3
+   d4 = tmp10 - tmp11;
+
+   z1 = (tmp12 + tmp13) * 0.707106781f; // c4
+   d2 = tmp13 + z1;       // phase 5
+   d6 = tmp13 - z1;
+
+   // Odd part
+   tmp10 = tmp4 + tmp5;       // phase 2
+   tmp11 = tmp5 + tmp6;
+   tmp12 = tmp6 + tmp7;
+
+   // The rotator is modified from fig 4-8 to avoid extra negations.
+   z5 = (tmp10 - tmp12) * 0.382683433f; // c6
+   z2 = tmp10 * 0.541196100f + z5; // c2-c6
+   z4 = tmp12 * 1.306562965f + z5; // c2+c6
+   z3 = tmp11 * 0.707106781f; // c4
+
+   z11 = tmp7 + z3;      // phase 5
+   z13 = tmp7 - z3;
+
+   *d5p = z13 + z2;         // phase 6
+   *d3p = z13 - z2;
+   *d1p = z11 + z4;
+   *d7p = z11 - z4;
+
+   *d0p = d0;  *d2p = d2;  *d4p = d4;  *d6p = d6;
+}
+
+static void stbiw__jpg_calcBits(int val, unsigned short bits[2]) {
+   int tmp1 = val < 0 ? -val : val;
+   val = val < 0 ? val-1 : val;
+   bits[1] = 1;
+   while(tmp1 >>= 1) {
+      ++bits[1];
+   }
+   bits[0] = val & ((1<<bits[1])-1);
+}
+
+static int stbiw__jpg_processDU(stbi__write_context *s, int *bitBuf, int *bitCnt, float *CDU, int du_stride, float *fdtbl, int DC, const unsigned short HTDC[256][2], const unsigned short HTAC[256][2]) {
+   const unsigned short EOB[2] = { HTAC[0x00][0], HTAC[0x00][1] };
+   const unsigned short M16zeroes[2] = { HTAC[0xF0][0], HTAC[0xF0][1] };
+   int dataOff, i, j, n, diff, end0pos, x, y;
+   int DU[64];
+
+   // DCT rows
+   for(dataOff=0, n=du_stride*8; dataOff<n; dataOff+=du_stride) {
+      stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff+1], &CDU[dataOff+2], &CDU[dataOff+3], &CDU[dataOff+4], &CDU[dataOff+5], &CDU[dataOff+6], &CDU[dataOff+7]);
+   }
+   // DCT columns
+   for(dataOff=0; dataOff<8; ++dataOff) {
+      stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff+du_stride], &CDU[dataOff+du_stride*2], &CDU[dataOff+du_stride*3], &CDU[dataOff+du_stride*4],
+                     &CDU[dataOff+du_stride*5], &CDU[dataOff+du_stride*6], &CDU[dataOff+du_stride*7]);
+   }
+   // Quantize/descale/zigzag the coefficients
+   for(y = 0, j=0; y < 8; ++y) {
+      for(x = 0; x < 8; ++x,++j) {
+         float v;
+         i = y*du_stride+x;
+         v = CDU[i]*fdtbl[j];
+         // DU[stbiw__jpg_ZigZag[j]] = (int)(v < 0 ? ceilf(v - 0.5f) : floorf(v + 0.5f));
+         // ceilf() and floorf() are C99, not C89, but I /think/ they're not needed here anyway?
+         DU[stbiw__jpg_ZigZag[j]] = (int)(v < 0 ? v - 0.5f : v + 0.5f);
+      }
+   }
+
+   // Encode DC
+   diff = DU[0] - DC;
+   if (diff == 0) {
+      stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[0]);
+   } else {
+      unsigned short bits[2];
+      stbiw__jpg_calcBits(diff, bits);
+      stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[bits[1]]);
+      stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits);
+   }
+   // Encode ACs
+   end0pos = 63;
+   for(; (end0pos>0)&&(DU[end0pos]==0); --end0pos) {
+   }
+   // end0pos = first element in reverse order !=0
+   if(end0pos == 0) {
+      stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB);
+      return DU[0];
+   }
+   for(i = 1; i <= end0pos; ++i) {
+      int startpos = i;
+      int nrzeroes;
+      unsigned short bits[2];
+      for (; DU[i]==0 && i<=end0pos; ++i) {
+      }
+      nrzeroes = i-startpos;
+      if ( nrzeroes >= 16 ) {
+         int lng = nrzeroes>>4;
+         int nrmarker;
+         for (nrmarker=1; nrmarker <= lng; ++nrmarker)
+            stbiw__jpg_writeBits(s, bitBuf, bitCnt, M16zeroes);
+         nrzeroes &= 15;
+      }
+      stbiw__jpg_calcBits(DU[i], bits);
+      stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTAC[(nrzeroes<<4)+bits[1]]);
+      stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits);
+   }
+   if(end0pos != 63) {
+      stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB);
+   }
+   return DU[0];
+}
+
+static int stbi_write_jpg_core(stbi__write_context *s, int width, int height, int comp, const void* data, int quality) {
+   // Constants that don't pollute global namespace
+   static const unsigned char std_dc_luminance_nrcodes[] = {0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0};
+   static const unsigned char std_dc_luminance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11};
+   static const unsigned char std_ac_luminance_nrcodes[] = {0,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d};
+   static const unsigned char std_ac_luminance_values[] = {
+      0x01,0x02,0x03,0x00,0x04,0x11,0x05,0x12,0x21,0x31,0x41,0x06,0x13,0x51,0x61,0x07,0x22,0x71,0x14,0x32,0x81,0x91,0xa1,0x08,
+      0x23,0x42,0xb1,0xc1,0x15,0x52,0xd1,0xf0,0x24,0x33,0x62,0x72,0x82,0x09,0x0a,0x16,0x17,0x18,0x19,0x1a,0x25,0x26,0x27,0x28,
+      0x29,0x2a,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58,0x59,
+      0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x83,0x84,0x85,0x86,0x87,0x88,0x89,
+      0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,0xb5,0xb6,
+      0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xe1,0xe2,
+      0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa
+   };
+   static const unsigned char std_dc_chrominance_nrcodes[] = {0,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0};
+   static const unsigned char std_dc_chrominance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11};
+   static const unsigned char std_ac_chrominance_nrcodes[] = {0,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77};
+   static const unsigned char std_ac_chrominance_values[] = {
+      0x00,0x01,0x02,0x03,0x11,0x04,0x05,0x21,0x31,0x06,0x12,0x41,0x51,0x07,0x61,0x71,0x13,0x22,0x32,0x81,0x08,0x14,0x42,0x91,
+      0xa1,0xb1,0xc1,0x09,0x23,0x33,0x52,0xf0,0x15,0x62,0x72,0xd1,0x0a,0x16,0x24,0x34,0xe1,0x25,0xf1,0x17,0x18,0x19,0x1a,0x26,
+      0x27,0x28,0x29,0x2a,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58,
+      0x59,0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x82,0x83,0x84,0x85,0x86,0x87,
+      0x88,0x89,0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,
+      0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,
+      0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa
+   };
+   // Huffman tables
+   static const unsigned short YDC_HT[256][2] = { {0,2},{2,3},{3,3},{4,3},{5,3},{6,3},{14,4},{30,5},{62,6},{126,7},{254,8},{510,9}};
+   static const unsigned short UVDC_HT[256][2] = { {0,2},{1,2},{2,2},{6,3},{14,4},{30,5},{62,6},{126,7},{254,8},{510,9},{1022,10},{2046,11}};
+   static const unsigned short YAC_HT[256][2] = {
+      {10,4},{0,2},{1,2},{4,3},{11,4},{26,5},{120,7},{248,8},{1014,10},{65410,16},{65411,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {12,4},{27,5},{121,7},{502,9},{2038,11},{65412,16},{65413,16},{65414,16},{65415,16},{65416,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {28,5},{249,8},{1015,10},{4084,12},{65417,16},{65418,16},{65419,16},{65420,16},{65421,16},{65422,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {58,6},{503,9},{4085,12},{65423,16},{65424,16},{65425,16},{65426,16},{65427,16},{65428,16},{65429,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {59,6},{1016,10},{65430,16},{65431,16},{65432,16},{65433,16},{65434,16},{65435,16},{65436,16},{65437,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {122,7},{2039,11},{65438,16},{65439,16},{65440,16},{65441,16},{65442,16},{65443,16},{65444,16},{65445,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {123,7},{4086,12},{65446,16},{65447,16},{65448,16},{65449,16},{65450,16},{65451,16},{65452,16},{65453,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {250,8},{4087,12},{65454,16},{65455,16},{65456,16},{65457,16},{65458,16},{65459,16},{65460,16},{65461,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {504,9},{32704,15},{65462,16},{65463,16},{65464,16},{65465,16},{65466,16},{65467,16},{65468,16},{65469,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {505,9},{65470,16},{65471,16},{65472,16},{65473,16},{65474,16},{65475,16},{65476,16},{65477,16},{65478,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {506,9},{65479,16},{65480,16},{65481,16},{65482,16},{65483,16},{65484,16},{65485,16},{65486,16},{65487,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {1017,10},{65488,16},{65489,16},{65490,16},{65491,16},{65492,16},{65493,16},{65494,16},{65495,16},{65496,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {1018,10},{65497,16},{65498,16},{65499,16},{65500,16},{65501,16},{65502,16},{65503,16},{65504,16},{65505,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {2040,11},{65506,16},{65507,16},{65508,16},{65509,16},{65510,16},{65511,16},{65512,16},{65513,16},{65514,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {65515,16},{65516,16},{65517,16},{65518,16},{65519,16},{65520,16},{65521,16},{65522,16},{65523,16},{65524,16},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {2041,11},{65525,16},{65526,16},{65527,16},{65528,16},{65529,16},{65530,16},{65531,16},{65532,16},{65533,16},{65534,16},{0,0},{0,0},{0,0},{0,0},{0,0}
+   };
+   static const unsigned short UVAC_HT[256][2] = {
+      {0,2},{1,2},{4,3},{10,4},{24,5},{25,5},{56,6},{120,7},{500,9},{1014,10},{4084,12},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {11,4},{57,6},{246,8},{501,9},{2038,11},{4085,12},{65416,16},{65417,16},{65418,16},{65419,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {26,5},{247,8},{1015,10},{4086,12},{32706,15},{65420,16},{65421,16},{65422,16},{65423,16},{65424,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {27,5},{248,8},{1016,10},{4087,12},{65425,16},{65426,16},{65427,16},{65428,16},{65429,16},{65430,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {58,6},{502,9},{65431,16},{65432,16},{65433,16},{65434,16},{65435,16},{65436,16},{65437,16},{65438,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {59,6},{1017,10},{65439,16},{65440,16},{65441,16},{65442,16},{65443,16},{65444,16},{65445,16},{65446,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {121,7},{2039,11},{65447,16},{65448,16},{65449,16},{65450,16},{65451,16},{65452,16},{65453,16},{65454,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {122,7},{2040,11},{65455,16},{65456,16},{65457,16},{65458,16},{65459,16},{65460,16},{65461,16},{65462,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {249,8},{65463,16},{65464,16},{65465,16},{65466,16},{65467,16},{65468,16},{65469,16},{65470,16},{65471,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {503,9},{65472,16},{65473,16},{65474,16},{65475,16},{65476,16},{65477,16},{65478,16},{65479,16},{65480,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {504,9},{65481,16},{65482,16},{65483,16},{65484,16},{65485,16},{65486,16},{65487,16},{65488,16},{65489,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {505,9},{65490,16},{65491,16},{65492,16},{65493,16},{65494,16},{65495,16},{65496,16},{65497,16},{65498,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {506,9},{65499,16},{65500,16},{65501,16},{65502,16},{65503,16},{65504,16},{65505,16},{65506,16},{65507,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {2041,11},{65508,16},{65509,16},{65510,16},{65511,16},{65512,16},{65513,16},{65514,16},{65515,16},{65516,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {16352,14},{65517,16},{65518,16},{65519,16},{65520,16},{65521,16},{65522,16},{65523,16},{65524,16},{65525,16},{0,0},{0,0},{0,0},{0,0},{0,0},
+      {1018,10},{32707,15},{65526,16},{65527,16},{65528,16},{65529,16},{65530,16},{65531,16},{65532,16},{65533,16},{65534,16},{0,0},{0,0},{0,0},{0,0},{0,0}
+   };
+   static const int YQT[] = {16,11,10,16,24,40,51,61,12,12,14,19,26,58,60,55,14,13,16,24,40,57,69,56,14,17,22,29,51,87,80,62,18,22,
+                             37,56,68,109,103,77,24,35,55,64,81,104,113,92,49,64,78,87,103,121,120,101,72,92,95,98,112,100,103,99};
+   static const int UVQT[] = {17,18,24,47,99,99,99,99,18,21,26,66,99,99,99,99,24,26,56,99,99,99,99,99,47,66,99,99,99,99,99,99,
+                              99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99};
+   static const float aasf[] = { 1.0f * 2.828427125f, 1.387039845f * 2.828427125f, 1.306562965f * 2.828427125f, 1.175875602f * 2.828427125f,
+                                 1.0f * 2.828427125f, 0.785694958f * 2.828427125f, 0.541196100f * 2.828427125f, 0.275899379f * 2.828427125f };
+
+   int row, col, i, k, subsample;
+   float fdtbl_Y[64], fdtbl_UV[64];
+   unsigned char YTable[64], UVTable[64];
+
+   if(!data || !width || !height || comp > 4 || comp < 1) {
+      return 0;
+   }
+
+   quality = quality ? quality : 90;
+   subsample = quality <= 90 ? 1 : 0;
+   quality = quality < 1 ? 1 : quality > 100 ? 100 : quality;
+   quality = quality < 50 ? 5000 / quality : 200 - quality * 2;
+
+   for(i = 0; i < 64; ++i) {
+      int uvti, yti = (YQT[i]*quality+50)/100;
+      YTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (yti < 1 ? 1 : yti > 255 ? 255 : yti);
+      uvti = (UVQT[i]*quality+50)/100;
+      UVTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (uvti < 1 ? 1 : uvti > 255 ? 255 : uvti);
+   }
+
+   for(row = 0, k = 0; row < 8; ++row) {
+      for(col = 0; col < 8; ++col, ++k) {
+         fdtbl_Y[k]  = 1 / (YTable [stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]);
+         fdtbl_UV[k] = 1 / (UVTable[stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]);
+      }
+   }
+
+   // Write Headers
+   {
+      static const unsigned char head0[] = { 0xFF,0xD8,0xFF,0xE0,0,0x10,'J','F','I','F',0,1,1,0,0,1,0,1,0,0,0xFF,0xDB,0,0x84,0 };
+      static const unsigned char head2[] = { 0xFF,0xDA,0,0xC,3,1,0,2,0x11,3,0x11,0,0x3F,0 };
+      const unsigned char head1[] = { 0xFF,0xC0,0,0x11,8,(unsigned char)(height>>8),STBIW_UCHAR(height),(unsigned char)(width>>8),STBIW_UCHAR(width),
+                                      3,1,(unsigned char)(subsample?0x22:0x11),0,2,0x11,1,3,0x11,1,0xFF,0xC4,0x01,0xA2,0 };
+      s->func(s->context, (void*)head0, sizeof(head0));
+      s->func(s->context, (void*)YTable, sizeof(YTable));
+      stbiw__putc(s, 1);
+      s->func(s->context, UVTable, sizeof(UVTable));
+      s->func(s->context, (void*)head1, sizeof(head1));
+      s->func(s->context, (void*)(std_dc_luminance_nrcodes+1), sizeof(std_dc_luminance_nrcodes)-1);
+      s->func(s->context, (void*)std_dc_luminance_values, sizeof(std_dc_luminance_values));
+      stbiw__putc(s, 0x10); // HTYACinfo
+      s->func(s->context, (void*)(std_ac_luminance_nrcodes+1), sizeof(std_ac_luminance_nrcodes)-1);
+      s->func(s->context, (void*)std_ac_luminance_values, sizeof(std_ac_luminance_values));
+      stbiw__putc(s, 1); // HTUDCinfo
+      s->func(s->context, (void*)(std_dc_chrominance_nrcodes+1), sizeof(std_dc_chrominance_nrcodes)-1);
+      s->func(s->context, (void*)std_dc_chrominance_values, sizeof(std_dc_chrominance_values));
+      stbiw__putc(s, 0x11); // HTUACinfo
+      s->func(s->context, (void*)(std_ac_chrominance_nrcodes+1), sizeof(std_ac_chrominance_nrcodes)-1);
+      s->func(s->context, (void*)std_ac_chrominance_values, sizeof(std_ac_chrominance_values));
+      s->func(s->context, (void*)head2, sizeof(head2));
+   }
+
+   // Encode 8x8 macroblocks
+   {
+      static const unsigned short fillBits[] = {0x7F, 7};
+      int DCY=0, DCU=0, DCV=0;
+      int bitBuf=0, bitCnt=0;
+      // comp == 2 is grey+alpha (alpha is ignored)
+      int ofsG = comp > 2 ? 1 : 0, ofsB = comp > 2 ? 2 : 0;
+      const unsigned char *dataR = (const unsigned char *)data;
+      const unsigned char *dataG = dataR + ofsG;
+      const unsigned char *dataB = dataR + ofsB;
+      int x, y, pos;
+      if(subsample) {
+         for(y = 0; y < height; y += 16) {
+            for(x = 0; x < width; x += 16) {
+               float Y[256], U[256], V[256];
+               for(row = y, pos = 0; row < y+16; ++row) {
+                  // row >= height => use last input row
+                  int clamped_row = (row < height) ? row : height - 1;
+                  int base_p = (stbi__flip_vertically_on_write ? (height-1-clamped_row) : clamped_row)*width*comp;
+                  for(col = x; col < x+16; ++col, ++pos) {
+                     // if col >= width => use pixel from last input column
+                     int p = base_p + ((col < width) ? col : (width-1))*comp;
+                     float r = dataR[p], g = dataG[p], b = dataB[p];
+                     Y[pos]= +0.29900f*r + 0.58700f*g + 0.11400f*b - 128;
+                     U[pos]= -0.16874f*r - 0.33126f*g + 0.50000f*b;
+                     V[pos]= +0.50000f*r - 0.41869f*g - 0.08131f*b;
+                  }
+               }
+               DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+0,   16, fdtbl_Y, DCY, YDC_HT, YAC_HT);
+               DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+8,   16, fdtbl_Y, DCY, YDC_HT, YAC_HT);
+               DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+128, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT);
+               DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+136, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT);
+
+               // subsample U,V
+               {
+                  float subU[64], subV[64];
+                  int yy, xx;
+                  for(yy = 0, pos = 0; yy < 8; ++yy) {
+                     for(xx = 0; xx < 8; ++xx, ++pos) {
+                        int j = yy*32+xx*2;
+                        subU[pos] = (U[j+0] + U[j+1] + U[j+16] + U[j+17]) * 0.25f;
+                        subV[pos] = (V[j+0] + V[j+1] + V[j+16] + V[j+17]) * 0.25f;
+                     }
+                  }
+                  DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subU, 8, fdtbl_UV, DCU, UVDC_HT, UVAC_HT);
+                  DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subV, 8, fdtbl_UV, DCV, UVDC_HT, UVAC_HT);
+               }
+            }
+         }
+      } else {
+         for(y = 0; y < height; y += 8) {
+            for(x = 0; x < width; x += 8) {
+               float Y[64], U[64], V[64];
+               for(row = y, pos = 0; row < y+8; ++row) {
+                  // row >= height => use last input row
+                  int clamped_row = (row < height) ? row : height - 1;
+                  int base_p = (stbi__flip_vertically_on_write ? (height-1-clamped_row) : clamped_row)*width*comp;
+                  for(col = x; col < x+8; ++col, ++pos) {
+                     // if col >= width => use pixel from last input column
+                     int p = base_p + ((col < width) ? col : (width-1))*comp;
+                     float r = dataR[p], g = dataG[p], b = dataB[p];
+                     Y[pos]= +0.29900f*r + 0.58700f*g + 0.11400f*b - 128;
+                     U[pos]= -0.16874f*r - 0.33126f*g + 0.50000f*b;
+                     V[pos]= +0.50000f*r - 0.41869f*g - 0.08131f*b;
+                  }
+               }
+
+               DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y, 8, fdtbl_Y,  DCY, YDC_HT, YAC_HT);
+               DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, U, 8, fdtbl_UV, DCU, UVDC_HT, UVAC_HT);
+               DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, V, 8, fdtbl_UV, DCV, UVDC_HT, UVAC_HT);
+            }
+         }
+      }
+
+      // Do the bit alignment of the EOI marker
+      stbiw__jpg_writeBits(s, &bitBuf, &bitCnt, fillBits);
+   }
+
+   // EOI
+   stbiw__putc(s, 0xFF);
+   stbiw__putc(s, 0xD9);
+
+   return 1;
+}
+
+STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality)
+{
+   stbi__write_context s = { 0 };
+   stbi__start_write_callbacks(&s, func, context);
+   return stbi_write_jpg_core(&s, x, y, comp, (void *) data, quality);
+}
+
+
+#ifndef STBI_WRITE_NO_STDIO
+STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality)
+{
+   stbi__write_context s = { 0 };
+   if (stbi__start_write_file(&s,filename)) {
+      int r = stbi_write_jpg_core(&s, x, y, comp, data, quality);
+      stbi__end_write_file(&s);
+      return r;
+   } else
+      return 0;
+}
+#endif
+
+#endif // STB_IMAGE_WRITE_IMPLEMENTATION
+
+/* Revision history
+      1.14  (2020-02-02) updated JPEG writer to downsample chroma channels
+      1.13
+      1.12
+      1.11  (2019-08-11)
+
+      1.10  (2019-02-07)
+             support utf8 filenames in Windows; fix warnings and platform ifdefs
+      1.09  (2018-02-11)
+             fix typo in zlib quality API, improve STB_I_W_STATIC in C++
+      1.08  (2018-01-29)
+             add stbi__flip_vertically_on_write, external zlib, zlib quality, choose PNG filter
+      1.07  (2017-07-24)
+             doc fix
+      1.06 (2017-07-23)
+             writing JPEG (using Jon Olick's code)
+      1.05   ???
+      1.04 (2017-03-03)
+             monochrome BMP expansion
+      1.03   ???
+      1.02 (2016-04-02)
+             avoid allocating large structures on the stack
+      1.01 (2016-01-16)
+             STBIW_REALLOC_SIZED: support allocators with no realloc support
+             avoid race-condition in crc initialization
+             minor compile issues
+      1.00 (2015-09-14)
+             installable file IO function
+      0.99 (2015-09-13)
+             warning fixes; TGA rle support
+      0.98 (2015-04-08)
+             added STBIW_MALLOC, STBIW_ASSERT etc
+      0.97 (2015-01-18)
+             fixed HDR asserts, rewrote HDR rle logic
+      0.96 (2015-01-17)
+             add HDR output
+             fix monochrome BMP
+      0.95 (2014-08-17)
+                      add monochrome TGA output
+      0.94 (2014-05-31)
+             rename private functions to avoid conflicts with stb_image.h
+      0.93 (2014-05-27)
+             warning fixes
+      0.92 (2010-08-01)
+             casts to unsigned char to fix warnings
+      0.91 (2010-07-17)
+             first public release
+      0.90   first internal release
+*/
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/
+

diff --git a/src/nbvtf/vtf_cmd.c b/src/nbvtf/vtf_cmd.c
new file mode 100644 (file)
index 0000000..1fc5536
--- /dev/null
+++ b/src/nbvtf/vtf_cmd.c
@@ -0,0 +1,132 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <math.h>
+
+#define STB_IMAGE_IMPLEMENTATION
+#define NBVTF_SHOW_STDERR
+#include "nbvtf.h"
+
+// Find file path extension, returns NULL if no ext (0x00)
+char *str_findext( char *szPath, char const delim )
+{
+       char *c, *ptr ;
+
+       c = szPath;
+       ptr = NULL;
+       
+       while( *c )
+       {
+               if( *c == delim )
+               {
+                       ptr = c + 1;
+               }
+       
+               c ++;
+       }
+
+       return ptr;
+}
+
+// gets rid of extension on string only left with folder/filename
+void path_stripext( char *szPath )
+{
+       char *point, *start;
+       
+       // Skip folders
+       if( !(start = str_findext( szPath, '/' )) )
+       {
+               start = szPath;
+       }
+       
+       if( (point = str_findext( start, '.' )) )
+       {
+               if( point > szPath )
+               {
+                       *(point-1) = 0x00;
+               }
+       }
+}
+
+EImageFormat_t format_from_str( const char *str )
+{
+       if( !strcmp( str, "dxt1" ) )
+               return k_EImageFormat_DXT1;
+       if( !strcmp( str, "dxt5" ) )
+               return k_EImageFormat_DXT5;
+       if( !strcmp( str, "rgb8" ) )
+               return k_EImageFormat_BGR888;
+       if( !strcmp( str, "rgba8" ) )
+               return k_EImageFormat_ABGR8888;
+       
+       return k_EImageFormat_NONE;
+}
+
+EImageFormat_t format_in_path( const char *path )
+{
+       char filepath[ 512 ];
+       
+       strcpy( filepath, path );
+       path_stripext( filepath );
+       
+       char *format_str = str_findext( filepath, '.' );
+       
+       if( format_str )
+       {
+               EImageFormat_t fmt;
+               fmt = format_from_str( format_str );
+               
+               if( fmt != -1 )
+               {
+                       return fmt;
+               }
+       }
+       
+       return k_EImageFormat_DXT1;
+}
+
+void auto_output( const char *path, char *dest )
+{
+       strcpy( dest, path );
+       path_stripext( dest );
+       strcat( dest, ".vtf" );
+}
+
+int main( int argc, char *argv[] )
+{
+       char dest[500];
+       
+       char *path_source;
+       EImageFormat_t format = k_EImageFormat_NONE;
+
+       if( argc < 2 )
+       {
+               printf( "Usage: vmt_cmd <optional_format> input_file<.format_in_path>.png\nSupported Formats:\n\trgb8, rgba8, dxt1, dxt5\n" );
+               return 0;
+       }
+
+       if( argc == 3 )
+       {
+               path_source = argv[2];
+               format = format_from_str( argv[1] );
+       }
+       
+       if( argc == 2 )
+       {
+               path_source = argv[1];
+               format = format_in_path( path_source );
+       }
+       
+       if( format == -1 )
+       {
+               fprintf( stderr, "tovtf: error with format choice. Unsupported\n" );
+               return 0;
+       }
+       
+       printf( "tovtf: Creating vtf with format '%s'\n", vtf_format_strings[ format ] );
+       
+       auto_output( path_source, dest );
+       nbvtf_convert( path_source, 0, 0, 1, format, 0x00, dest );
+
+       return 0;
+}

diff --git a/src/solid.h b/src/solid.h
new file mode 100644 (file)
index 0000000..f8a0f89
--- /dev/null
+++ b/src/solid.h
@@ -0,0 +1,772 @@
+v3f test_verts[] = {
+   { 11.185741, 0.535051, -2.047508 },
+   { 27.185741, 0.535051, -2.047508 },
+   { 11.185741, 16.535051, -2.047508 },
+   { 27.185741, 16.535051, -2.047508 },
+   { 11.185741, 13.335052, -2.047508 },
+   { 11.185741, 10.135052, -2.047508 },
+   { 11.185741, 6.935051, -2.047508 },
+   { 11.185741, 3.735051, -2.047508 },
+   { 26.086811, 3.735051, -2.047508 },
+   { 27.185741, 6.935051, -2.047508 },
+   { 27.185741, 10.135052, -2.047508 },
+   { 27.185741, 13.335052, -2.047508 },
+   { 14.385741, 0.535051, -2.047508 },
+   { 17.585741, 0.535051, -2.047508 },
+   { 20.785742, 0.535051, -2.047508 },
+   { 20.785742, 16.535051, -2.047508 },
+   { 17.585741, 16.535051, -2.047508 },
+   { 14.385741, 16.535051, -2.047508 },
+   { 20.785742, 3.108177, -2.047508 },
+   { 17.585741, 3.735051, -2.047508 },
+   { 14.385741, 3.735051, -2.047508 },
+   { 20.785742, 6.935051, -2.047508 },
+   { 17.585741, 6.935051, -2.047508 },
+   { 14.385741, 6.935051, -2.047508 },
+   { 20.785742, 10.135052, -2.047508 },
+   { 17.585741, 10.135052, -2.047508 },
+   { 14.385741, 10.135052, -2.047508 },
+   { 20.785742, 13.335052, -2.047508 },
+   { 17.585741, 13.335052, -2.047508 },
+   { 14.385741, 13.335052, -2.047508 },
+   { 11.185741, 13.335052, 1.606183 },
+   { 27.185741, 6.935051, 0.909645 },
+   { 20.785742, 0.535051, 0.909645 },
+   { 11.185741, 16.535051, -0.552386 },
+   { 11.185741, 3.735051, 0.909645 },
+   { 27.185741, 0.535051, 0.909645 },
+   { 27.185741, 13.335052, 1.606183 },
+   { 20.785742, 16.535051, -0.552386 },
+   { 11.185741, 10.135052, 0.909645 },
+   { 17.585741, 0.535051, 0.909645 },
+   { 27.185741, 10.135052, 0.909645 },
+   { 17.585741, 16.535051, -0.552386 },
+   { 14.385741, 16.535051, -0.552386 },
+   { 27.185741, 16.535051, -0.552386 },
+   { 11.185741, 6.935051, 0.909645 },
+   { 26.086811, 3.735051, 0.909645 },
+   { 11.185741, 0.535051, 0.909645 },
+   { 14.385741, 0.535051, 0.909645 },
+   { 27.185741, 13.335052, 6.787578 },
+   { 27.185741, 16.535051, 6.787578 },
+   { 14.385741, 0.535051, 6.787578 },
+   { 14.385741, 3.735051, 6.787578 },
+   { 17.585741, 13.335052, 6.787578 },
+   { 17.585741, 16.535051, 6.787578 },
+   { 20.785742, 16.535051, 6.787578 },
+   { 11.185741, 16.535051, 6.787578 },
+   { 11.185741, 13.335052, 6.787578 },
+   { 11.185741, 3.735051, 6.787578 },
+   { 17.585741, 0.535051, 6.787578 },
+   { 20.785742, 0.535051, 6.787578 },
+   { 20.785742, 13.335052, 6.787578 },
+   { 20.785742, 3.108177, 6.787578 },
+   { 11.185741, 0.535051, 6.787578 },
+   { 14.385741, 6.935051, 6.787578 },
+   { 14.385741, 10.135052, 6.787578 },
+   { 17.585741, 6.935051, 6.787578 },
+   { 17.585741, 10.135052, 6.787578 },
+   { 14.385741, 16.535051, 6.787578 },
+   { 26.086811, 3.735051, 6.787578 },
+   { 27.185741, 6.935051, 6.787578 },
+   { 11.185741, 10.135052, 6.787578 },
+   { 27.185741, 10.135052, 6.787578 },
+   { 11.185741, 6.935051, 6.787578 },
+   { 20.785742, 10.135052, 6.787578 },
+   { 20.785742, 6.935051, 6.787578 },
+   { 17.585741, 3.735051, 6.787578 },
+   { 14.385741, 13.335052, 6.787578 },
+   { 27.185741, 0.535051, 6.787578 },
+   { 11.185741, 16.535051, 3.438894 },
+   { 27.185741, 0.535051, 3.438894 },
+   { 11.185741, 10.135052, 3.438894 },
+   { 17.585741, 16.535051, 3.438894 },
+   { 14.385741, 16.535051, 3.438894 },
+   { 27.185741, 16.535051, 3.438894 },
+   { 14.385741, 0.535051, 3.438894 },
+   { 11.185741, 13.335052, 3.438894 },
+   { 27.185741, 6.935051, 3.438894 },
+   { 20.785742, 0.535051, 3.438894 },
+   { 11.185741, 3.735051, 3.438894 },
+   { 27.185741, 13.335052, 3.438894 },
+   { 20.785742, 16.535051, 3.438894 },
+   { 17.585741, 0.535051, 3.438894 },
+   { 27.185741, 10.135052, 3.438894 },
+   { 11.185741, 6.935051, 3.438894 },
+   { 26.086811, 3.735051, 3.438894 },
+   { 11.185741, 0.535051, 3.438894 },
+};
+struct cxr_input_loop test_loops[] = {
+   {50, 142},
+   {58, 128},
+   {75, 127},
+   {51, 104},
+   {65, 125},
+   {74, 126},
+   {73, 141},
+   {66, 114},
+   {73, 124},
+   {71, 120},
+   {48, 132},
+   {60, 133},
+   {70, 118},
+   {64, 131},
+   {76, 146},
+   {56, 119},
+   {24, 17},
+   {27, 39},
+   {11, 4},
+   {10, 48},
+   {13, 58},
+   {39, 101},
+   {47, 84},
+   {12, 11},
+   {81, 171},
+   {90, 74},
+   {37, 89},
+   {41, 155},
+   {52, 122},
+   {60, 110},
+   {54, 106},
+   {53, 105},
+   {91, 165},
+   {58, 142},
+   {50, 66},
+   {84, 182},
+   {4, 49},
+   {30, 94},
+   {33, 70},
+   {2, 18},
+   {59, 136},
+   {77, 137},
+   {68, 147},
+   {61, 111},
+   {29, 23},
+   {17, 41},
+   {16, 16},
+   {28, 3},
+   {28, 16},
+   {16, 15},
+   {15, 1},
+   {27, 29},
+   {1, 72},
+   {35, 92},
+   {32, 51},
+   {14, 43},
+   {31, 50},
+   {9, 14},
+   {10, 59},
+   {40, 87},
+   {33, 152},
+   {78, 179},
+   {82, 156},
+   {42, 86},
+   {11, 55},
+   {36, 98},
+   {40, 59},
+   {10, 4},
+   {57, 108},
+   {51, 129},
+   {63, 150},
+   {72, 149},
+   {21, 9},
+   {24, 48},
+   {10, 14},
+   {9, 13},
+   {14, 7},
+   {18, 34},
+   {8, 44},
+   {1, 43},
+   {4, 18},
+   {2, 21},
+   {17, 23},
+   {29, 2},
+   {1, 44},
+   {8, 64},
+   {45, 85},
+   {35, 72},
+   {17, 79},
+   {42, 90},
+   {41, 78},
+   {16, 41},
+   {54, 117},
+   {49, 62},
+   {83, 176},
+   {90, 164},
+   {62, 169},
+   {95, 187},
+   {84, 66},
+   {50, 139},
+   {46, 83},
+   {95, 180},
+   {88, 71},
+   {34, 99},
+   {82, 173},
+   {81, 155},
+   {41, 90},
+   {42, 156},
+   {8, 12},
+   {9, 50},
+   {31, 96},
+   {45, 64},
+   {23, 25},
+   {26, 33},
+   {25, 31},
+   {22, 46},
+   {67, 115},
+   {53, 60},
+   {81, 173},
+   {82, 61},
+   {7, 53},
+   {34, 102},
+   {44, 63},
+   {6, 0},
+   {41, 89},
+   {37, 56},
+   {15, 15},
+   {16, 78},
+   {79, 185},
+   {87, 69},
+   {32, 92},
+   {35, 153},
+   {6, 42},
+   {5, 20},
+   {26, 25},
+   {23, 28},
+   {89, 186},
+   {92, 77},
+   {40, 98},
+   {36, 73},
+   {95, 169},
+   {62, 112},
+   {57, 162},
+   {88, 180},
+   {69, 116},
+   {68, 168},
+   {94, 184},
+   {86, 160},
+   {34, 71},
+   {88, 181},
+   {93, 81},
+   {44, 102},
+   {0, 6},
+   {7, 5},
+   {20, 22},
+   {12, 32},
+   {62, 139},
+   {50, 104},
+   {51, 108},
+   {57, 112},
+   {88, 162},
+   {57, 149},
+   {72, 167},
+   {93, 181},
+   {18, 8},
+   {21, 13},
+   {9, 12},
+   {8, 34},
+   {47, 95},
+   {46, 65},
+   {0, 32},
+   {12, 84},
+   {77, 136},
+   {59, 161},
+   {87, 185},
+   {79, 54},
+   {90, 176},
+   {83, 157},
+   {43, 88},
+   {37, 74},
+   {53, 106},
+   {54, 164},
+   {90, 171},
+   {81, 60},
+   {76, 138},
+   {52, 105},
+   {53, 115},
+   {67, 144},
+   {30, 67},
+   {85, 172},
+   {78, 152},
+   {33, 94},
+   {75, 130},
+   {61, 134},
+   {74, 125},
+   {65, 151},
+   {94, 175},
+   {79, 153},
+   {35, 85},
+   {45, 82},
+   {63, 140},
+   {65, 114},
+   {66, 145},
+   {64, 113},
+   {95, 83},
+   {46, 95},
+   {47, 158},
+   {84, 187},
+   {78, 52},
+   {55, 143},
+   {67, 61},
+   {82, 179},
+   {70, 119},
+   {56, 159},
+   {85, 183},
+   {80, 57},
+   {39, 76},
+   {91, 182},
+   {84, 158},
+   {47, 101},
+   {64, 145},
+   {66, 148},
+   {52, 138},
+   {76, 131},
+   {80, 183},
+   {85, 67},
+   {30, 97},
+   {38, 154},
+   {15, 56},
+   {37, 88},
+   {43, 80},
+   {3, 19},
+   {89, 170},
+   {83, 62},
+   {49, 103},
+   {48, 163},
+   {0, 65},
+   {46, 99},
+   {34, 53},
+   {7, 6},
+   {5, 75},
+   {38, 97},
+   {30, 49},
+   {4, 10},
+   {68, 137},
+   {77, 54},
+   {79, 175},
+   {94, 168},
+   {19, 40},
+   {22, 36},
+   {21, 8},
+   {18, 24},
+   {14, 51},
+   {32, 93},
+   {39, 58},
+   {13, 45},
+   {66, 141},
+   {73, 133},
+   {60, 122},
+   {52, 148},
+   {32, 69},
+   {87, 174},
+   {91, 76},
+   {39, 93},
+   {61, 147},
+   {68, 116},
+   {69, 135},
+   {74, 134},
+   {38, 91},
+   {44, 81},
+   {93, 178},
+   {80, 154},
+   {48, 120},
+   {71, 166},
+   {92, 186},
+   {89, 163},
+   {12, 22},
+   {20, 27},
+   {19, 37},
+   {13, 11},
+   {20, 47},
+   {23, 46},
+   {22, 40},
+   {19, 27},
+   {5, 42},
+   {6, 63},
+   {44, 91},
+   {38, 75},
+   {87, 161},
+   {59, 109},
+   {58, 165},
+   {91, 174},
+   {22, 31},
+   {25, 38},
+   {24, 9},
+   {21, 36},
+   {13, 37},
+   {19, 24},
+   {18, 7},
+   {14, 45},
+   {86, 184},
+   {94, 82},
+   {45, 96},
+   {31, 68},
+   {5, 10},
+   {4, 2},
+   {29, 35},
+   {26, 20},
+   {11, 26},
+   {3, 80},
+   {43, 100},
+   {36, 55},
+   {2, 70},
+   {33, 86},
+   {42, 79},
+   {17, 21},
+   {7, 0},
+   {6, 28},
+   {23, 47},
+   {20, 5},
+   {36, 100},
+   {43, 157},
+   {83, 170},
+   {89, 73},
+   {26, 35},
+   {29, 3},
+   {28, 30},
+   {25, 33},
+   {58, 109},
+   {59, 111},
+   {61, 130},
+   {75, 128},
+   {92, 177},
+   {86, 68},
+   {31, 87},
+   {40, 77},
+   {80, 178},
+   {93, 167},
+   {72, 121},
+   {70, 57},
+   {25, 30},
+   {28, 29},
+   {27, 17},
+   {24, 38},
+   {60, 132},
+   {48, 103},
+   {49, 117},
+   {54, 110},
+   {51, 127},
+   {75, 151},
+   {65, 140},
+   {63, 129},
+   {74, 135},
+   {69, 123},
+   {71, 124},
+   {73, 126},
+   {72, 150},
+   {63, 113},
+   {64, 118},
+   {70, 121},
+   {85, 159},
+   {56, 107},
+   {55, 52},
+   {78, 172},
+   {71, 123},
+   {69, 160},
+   {86, 177},
+   {92, 166},
+   {27, 1},
+   {15, 19},
+   {3, 26},
+   {11, 39},
+   {56, 146},
+   {76, 144},
+   {67, 143},
+   {55, 107},
+};
+struct cxr_polygon test_polys[] = {
+   {0, 4, {0.000000, 0.000000, 1.000000}, {15.985741, 2.135051, 6.787578}},
+   {4, 4, {0.000000, 0.000000, 1.000000}, {19.185741, 8.535051, 6.787578}},
+   {8, 4, {0.000000, 0.000000, 1.000000}, {23.985743, 11.735052, 6.787578}},
+   {12, 4, {0.000000, 0.000000, 1.000000}, {12.785742, 11.735052, 6.787578}},
+   {16, 4, {-0.000000, 0.000000, -1.000000}, {23.985741, 11.735052, -2.047508}},
+   {20, 4, {0.000000, -1.000000, 0.000000}, {15.985742, 0.535051, -0.568931}},
+   {24, 4, {0.000000, 1.000000, 0.000000}, {19.185741, 16.535051, 1.443254}},
+   {28, 4, {0.000000, 0.000000, 1.000000}, {19.185741, 14.935051, 6.787578}},
+   {32, 4, {0.000000, -1.000000, 0.000000}, {15.985742, 0.535051, 5.113236}},
+   {36, 4, {-1.000000, -0.000000, 0.000000}, {11.185741, 14.935051, -0.760305}},
+   {40, 4, {0.000000, 0.000000, 1.000000}, {23.711008, 1.978333, 6.787578}},
+   {44, 4, {-0.000000, 0.000000, -1.000000}, {15.985741, 14.935051, -2.047508}},
+   {48, 4, {-0.000000, 0.000000, -1.000000}, {19.185741, 14.935051, -2.047508}},
+   {52, 4, {0.000000, -1.000000, 0.000000}, {23.985743, 0.535051, -0.568931}},
+   {56, 4, {1.000000, 0.000000, 0.000000}, {27.185741, 8.535051, -0.568931}},
+   {60, 4, {0.000000, 1.000000, 0.000000}, {12.785742, 16.535051, 1.443254}},
+   {64, 4, {1.000000, 0.000000, 0.000000}, {27.185741, 11.735051, -0.394797}},
+   {68, 4, {0.000000, 0.000000, 1.000000}, {12.785742, 5.335051, 6.787578}},
+   {72, 4, {-0.000000, 0.000000, -1.000000}, {23.985741, 8.535051, -2.047508}},
+   {76, 4, {-0.000000, 0.000000, -1.000000}, {23.711010, 1.978333, -2.047508}},
+   {80, 4, {-0.000000, 0.000000, -1.000000}, {12.785742, 14.935051, -2.047508}},
+   {84, 4, {0.945784, 0.324797, 0.000000}, {26.636276, 2.135051, -0.568931}},
+   {88, 4, {0.000000, 1.000000, 0.000000}, {15.985741, 16.535051, -1.299947}},
+   {92, 4, {0.000000, 1.000000, 0.000000}, {23.985743, 16.535051, 5.113236}},
+   {96, 4, {0.000000, -1.000000, 0.000000}, {12.785742, 0.535051, 5.113235}},
+   {100, 4, {-1.000000, -0.000000, 0.000000}, {11.185741, 2.135051, 2.174269}},
+   {104, 4, {0.000000, 1.000000, 0.000000}, {15.985741, 16.535051, 1.443254}},
+   {108, 4, {0.945784, -0.324797, 0.000000}, {26.636276, 5.335051, -0.568931}},
+   {112, 4, {-0.000000, 0.000000, -1.000000}, {15.985741, 8.535051, -2.047508}},
+   {116, 4, {0.000000, 1.000000, 0.000000}, {15.985741, 16.535051, 5.113236}},
+   {120, 4, {-1.000000, -0.000000, 0.000000}, {11.185741, 5.335051, -0.568931}},
+   {124, 4, {0.000000, 1.000000, 0.000000}, {19.185741, 16.535051, -1.299947}},
+   {128, 4, {0.000000, -1.000000, 0.000000}, {23.985741, 0.535051, 2.174269}},
+   {132, 4, {-0.000000, 0.000000, -1.000000}, {12.785742, 8.535051, -2.047508}},
+   {136, 4, {1.000000, 0.000000, 0.000000}, {27.185741, 11.735052, 2.348404}},
+   {140, 4, {-1.000000, -0.000000, 0.000000}, {11.185741, 2.135051, 5.113236}},
+   {144, 4, {0.945784, -0.324797, 0.000000}, {26.636276, 5.335051, 5.113236}},
+   {148, 4, {-1.000000, -0.000000, 0.000000}, {11.185741, 5.335051, 2.174269}},
+   {152, 4, {-0.000000, 0.000000, -1.000000}, {12.785742, 2.135051, -2.047508}},
+   {156, 4, {0.000000, 0.000000, 1.000000}, {12.785742, 2.135051, 6.787578}},
+   {160, 4, {-1.000000, -0.000000, 0.000000}, {11.185741, 5.335051, 5.113236}},
+   {164, 4, {-0.000000, 0.000000, -1.000000}, {23.711010, 5.178332, -2.047508}},
+   {168, 4, {0.000000, -1.000000, 0.000000}, {12.785742, 0.535051, -0.568931}},
+   {172, 4, {0.000000, -1.000000, 0.000000}, {23.985741, 0.535051, 5.113236}},
+   {176, 4, {0.000000, 1.000000, 0.000000}, {23.985743, 16.535051, 1.443254}},
+   {180, 4, {0.000000, 1.000000, 0.000000}, {19.185741, 16.535051, 5.113236}},
+   {184, 4, {0.000000, 0.000000, 1.000000}, {15.985741, 14.935051, 6.787578}},
+   {188, 4, {-1.000000, -0.000000, 0.000000}, {11.185741, 14.935051, 1.982896}},
+   {192, 4, {0.000000, 0.000000, 1.000000}, {19.185741, 5.178332, 6.787578}},
+   {196, 4, {0.945784, 0.324797, 0.000000}, {26.636276, 2.135051, 2.174269}},
+   {200, 4, {0.000000, 0.000000, 1.000000}, {15.985741, 8.535051, 6.787578}},
+   {204, 4, {0.000000, -1.000000, 0.000000}, {12.785742, 0.535051, 2.174269}},
+   {208, 4, {0.000000, 1.000000, 0.000000}, {12.785742, 16.535051, 5.113236}},
+   {212, 4, {-1.000000, 0.000000, 0.000000}, {11.185741, 11.735052, 5.113236}},
+   {216, 4, {0.000000, -1.000000, 0.000000}, {15.985742, 0.535051, 2.174269}},
+   {220, 4, {0.000000, 0.000000, 1.000000}, {15.985741, 11.735052, 6.787578}},
+   {224, 4, {-1.000000, 0.000000, 0.000000}, {11.185741, 11.735052, 2.348404}},
+   {228, 4, {0.000000, 1.000000, 0.000000}, {23.985741, 16.535051, -1.299947}},
+   {232, 4, {1.000000, 0.000000, 0.000000}, {27.185741, 14.935051, 5.113235}},
+   {236, 4, {-1.000000, -0.000000, 0.000000}, {11.185741, 2.135051, -0.568931}},
+   {240, 4, {-1.000000, -0.000000, 0.000000}, {11.185741, 11.735052, -0.394797}},
+   {244, 4, {0.945784, 0.324797, 0.000000}, {26.636276, 2.135051, 5.113236}},
+   {248, 4, {-0.000000, 0.000000, -1.000000}, {19.185741, 5.178332, -2.047508}},
+   {252, 4, {0.000000, -1.000000, 0.000000}, {19.185741, 0.535051, -0.568931}},
+   {256, 4, {0.000000, 0.000000, 1.000000}, {19.185741, 11.735052, 6.787578}},
+   {260, 4, {0.000000, -1.000000, 0.000000}, {19.185741, 0.535051, 2.174269}},
+   {264, 4, {0.000000, 0.000000, 1.000000}, {23.711008, 5.178332, 6.787578}},
+   {268, 4, {-1.000000, 0.000000, 0.000000}, {11.185741, 8.535051, 2.174269}},
+   {272, 4, {1.000000, 0.000000, 0.000000}, {27.185741, 11.735052, 5.113236}},
+   {276, 4, {-0.000000, 0.000000, -1.000000}, {15.985741, 2.135051, -2.047508}},
+   {280, 4, {-0.000000, 0.000000, -1.000000}, {15.985741, 5.335051, -2.047508}},
+   {284, 4, {-1.000000, 0.000000, 0.000000}, {11.185741, 8.535051, -0.568931}},
+   {288, 4, {0.000000, -1.000000, 0.000000}, {19.185741, 0.535051, 5.113236}},
+   {292, 4, {-0.000000, 0.000000, -1.000000}, {19.185741, 8.535051, -2.047508}},
+   {296, 4, {-0.000000, 0.000000, -1.000000}, {19.185741, 1.978333, -2.047508}},
+   {300, 4, {0.945784, -0.324797, 0.000000}, {26.636276, 5.335051, 2.174269}},
+   {304, 4, {-0.000000, 0.000000, -1.000000}, {12.785742, 11.735052, -2.047508}},
+   {308, 4, {1.000000, 0.000000, 0.000000}, {27.185741, 14.935051, -0.760305}},
+   {312, 4, {0.000000, 1.000000, 0.000000}, {12.785742, 16.535051, -1.299947}},
+   {316, 4, {-0.000000, 0.000000, -1.000000}, {12.785742, 5.335051, -2.047508}},
+   {320, 4, {1.000000, 0.000000, 0.000000}, {27.185741, 14.935051, 1.982896}},
+   {324, 4, {-0.000000, 0.000000, -1.000000}, {15.985741, 11.735052, -2.047508}},
+   {328, 4, {0.000000, 0.000000, 1.000000}, {19.185741, 1.978333, 6.787578}},
+   {332, 4, {1.000000, 0.000000, 0.000000}, {27.185741, 8.535051, 2.174269}},
+   {336, 4, {-1.000000, 0.000000, 0.000000}, {11.185741, 8.535051, 5.113235}},
+   {340, 4, {-0.000000, 0.000000, -1.000000}, {19.185741, 11.735052, -2.047508}},
+   {344, 4, {0.000000, 0.000000, 1.000000}, {23.985743, 14.935051, 6.787578}},
+   {348, 4, {0.000000, 0.000000, 1.000000}, {15.985741, 5.335051, 6.787578}},
+   {352, 4, {0.000000, 0.000000, 1.000000}, {23.985743, 8.535051, 6.787578}},
+   {356, 4, {0.000000, 0.000000, 1.000000}, {12.785742, 8.535051, 6.787578}},
+   {360, 4, {-1.000000, -0.000000, 0.000000}, {11.185741, 14.935051, 5.113236}},
+   {364, 4, {1.000000, 0.000000, 0.000000}, {27.185741, 8.535051, 5.113236}},
+   {368, 4, {-0.000000, 0.000000, -1.000000}, {23.985741, 14.935051, -2.047508}},
+   {372, 4, {0.000000, 0.000000, 1.000000}, {12.785742, 14.935051, 6.787578}},
+};
+struct cxr_edge test_edges[] = {
+   {6, 7},
+   {27, 15},
+   {29, 4},
+   {28, 29},
+   {10, 11},
+   {20, 7},
+   {7, 0},
+   {14, 18},
+   {18, 21},
+   {21, 24},
+   {4, 5},
+   {12, 13},
+   {8, 9},
+   {9, 21},
+   {9, 10},
+   {15, 16},
+   {28, 16},
+   {24, 27},
+   {2, 4},
+   {3, 15},
+   {26, 5},
+   {17, 2},
+   {12, 20},
+   {29, 17},
+   {18, 19},
+   {23, 26},
+   {11, 3},
+   {19, 20},
+   {23, 6},
+   {27, 28},
+   {25, 28},
+   {22, 25},
+   {0, 12},
+   {25, 26},
+   {8, 18},
+   {26, 29},
+   {21, 22},
+   {13, 19},
+   {24, 25},
+   {11, 27},
+   {19, 22},
+   {16, 17},
+   {5, 6},
+   {14, 1},
+   {1, 8},
+   {13, 14},
+   {22, 23},
+   {20, 23},
+   {10, 24},
+   {30, 4},
+   {31, 9},
+   {32, 14},
+   {78, 55},
+   {34, 7},
+   {79, 77},
+   {36, 11},
+   {37, 15},
+   {80, 70},
+   {39, 13},
+   {40, 10},
+   {81, 53},
+   {82, 67},
+   {83, 49},
+   {44, 6},
+   {45, 8},
+   {46, 0},
+   {84, 50},
+   {85, 30},
+   {86, 31},
+   {87, 32},
+   {2, 33},
+   {88, 34},
+   {1, 35},
+   {89, 36},
+   {90, 37},
+   {5, 38},
+   {91, 39},
+   {92, 40},
+   {16, 41},
+   {17, 42},
+   {3, 43},
+   {93, 44},
+   {94, 45},
+   {95, 46},
+   {12, 47},
+   {45, 35},
+   {33, 42},
+   {31, 40},
+   {37, 43},
+   {37, 41},
+   {42, 41},
+   {44, 38},
+   {35, 32},
+   {32, 39},
+   {30, 33},
+   {46, 47},
+   {31, 45},
+   {38, 30},
+   {36, 40},
+   {46, 34},
+   {43, 36},
+   {39, 47},
+   {34, 44},
+   {48, 49},
+   {50, 51},
+   {52, 53},
+   {54, 53},
+   {55, 56},
+   {51, 57},
+   {58, 59},
+   {60, 54},
+   {59, 61},
+   {57, 62},
+   {63, 64},
+   {65, 66},
+   {53, 67},
+   {68, 69},
+   {49, 54},
+   {64, 70},
+   {56, 70},
+   {71, 48},
+   {70, 72},
+   {60, 52},
+   {69, 71},
+   {71, 73},
+   {74, 65},
+   {74, 73},
+   {75, 51},
+   {58, 75},
+   {51, 63},
+   {61, 75},
+   {64, 76},
+   {48, 60},
+   {73, 60},
+   {61, 74},
+   {69, 74},
+   {59, 77},
+   {77, 68},
+   {52, 76},
+   {62, 50},
+   {65, 63},
+   {73, 66},
+   {50, 58},
+   {67, 55},
+   {76, 67},
+   {66, 64},
+   {76, 56},
+   {68, 61},
+   {66, 52},
+   {72, 57},
+   {63, 72},
+   {75, 65},
+   {33, 78},
+   {35, 79},
+   {38, 80},
+   {41, 81},
+   {42, 82},
+   {43, 83},
+   {47, 84},
+   {56, 85},
+   {69, 86},
+   {59, 87},
+   {57, 88},
+   {48, 89},
+   {54, 90},
+   {58, 91},
+   {71, 92},
+   {72, 93},
+   {68, 94},
+   {62, 95},
+   {83, 89},
+   {90, 81},
+   {85, 78},
+   {81, 82},
+   {87, 91},
+   {79, 94},
+   {83, 90},
+   {86, 92},
+   {93, 80},
+   {78, 82},
+   {95, 88},
+   {88, 93},
+   {91, 84},
+   {85, 80},
+   {94, 86},
+   {87, 79},
+   {92, 89},
+   {95, 84},
+};
+struct cxr_input_mesh test_mesh = {
+   .vertices = test_verts,
+   .loops = test_loops,
+   .edges = test_edges,
+   .polys = test_polys,
+   .poly_count=94,
+   .vertex_count=96,
+   .edge_count=188,
+   .loop_count=376
+};

diff --git a/src/test.c b/src/test.c
new file mode 100644 (file)
index 0000000..cf4e395
--- /dev/null
+++ b/src/test.c
@@ -0,0 +1,8 @@
+#include "convexer.c"
+#include "solid.h"
+
+int main(int arc, const char *argv[])
+{
+   cxr_decompose( &test_mesh );
+   return 0;
+}