world_gate.h

   1 /*
   2  * Copyright (C) 2021-2022 Mt.ZERO Software, Harry Godden - All Rights Reserved
   3  */
   4
   5 #ifndef WORLD_GATE_H
   6 #define WORLD_GATE_H
   7
   8 #define GATE_RENDER_PERFORMANCE
   9
  10 #include "common.h"
  11 #include "model.h"
  12 #include "render.h"
  13
  14 #ifndef GATE_RENDER_PERFORMANCE
  15   #include "shaders/gate.h"
  16 #else
  17   #include "shaders/gatelq.h"
  18 #endif
  19
  20 #include "world_water.h"
  21
  22
  23 static struct
  24 {
  25    struct framebuffer fb;
  26    glmesh mdl;
  27 }
  28 grender =
  29 {
  30    .fb = {
  31       .format = GL_RGB,
  32       .div = 1
  33    }
  34 };
  35
  36 static void gate_transform_update( teleport_gate *gate )
  37 {
  38    m4x3f to_local;
  39
  40    q_m3x3( gate->q[0], gate->to_world );
  41    v3_copy( gate->co[0], gate->to_world[3] );
  42
  43    m4x3_invert_affine( gate->to_world, to_local );
  44
  45    q_m3x3( gate->q[1], gate->recv_to_world );
  46    v3_copy( gate->co[1], gate->recv_to_world[3] );
  47    m4x3_mul( gate->recv_to_world, to_local, gate->transport );
  48 }
  49
  50 static void world_gates_init(void)
  51 {
  52    vg_info( "world_gates_init\n" );
  53
  54 #ifndef GATE_RENDER_PERFORMANCE
  55    shader_gate_register();
  56 #else
  57    shader_gatelq_register();
  58 #endif
  59
  60    mdl_header *mgate = mdl_load( "models/rs_gate.mdl" );
  61
  62    vg_acquire_thread_sync();
  63    {
  64       fb_init( &grender.fb );
  65       mdl_unpack_glmesh( mgate, &grender.mdl );
  66    }
  67    vg_release_thread_sync();
  68 }
  69
  70 static void world_gates_free(void*_)
  71 {
  72    fb_free( &grender.fb );
  73 }
  74
  75 static void gate_fb_resize(void)
  76 {
  77    fb_resize( &grender.fb );
  78 }
  79
  80 static int render_gate( teleport_gate *gate, v3f viewpos, m4x3f camera )
  81 {
  82    v3f viewdir, gatedir;
  83    m3x3_mulv( camera, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  84    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, gatedir );
  85
  86    v3f v0;
  87    v3_sub( viewpos, gate->co[0], v0 );
  88    if( v3_dot(v0, gatedir) >= 0.0f )
  89       return 0;
  90
  91    if( v3_dist( viewpos, gate->co[0] ) > 100.0f )
  92       return 0;
  93
  94    v3f a,b,c,d;
  95
  96    float sx = gate->dims[0],
  97          sy = gate->dims[1];
  98    m4x3_mulv( gate->to_world, (v3f){-sx,-sy,0.0f}, a );
  99    m4x3_mulv( gate->to_world, (v3f){ sx,-sy,0.0f}, b );
 100    m4x3_mulv( gate->to_world, (v3f){ sx, sy,0.0f}, c );
 101    m4x3_mulv( gate->to_world, (v3f){-sx, sy,0.0f}, d );
 102
 103    vg_line( a,b, 0xffffa000 );
 104    vg_line( b,c, 0xffffa000 );
 105    vg_line( c,d, 0xffffa000 );
 106    vg_line( d,a, 0xffffa000 );
 107
 108    vg_line2( gate->co[0], gate->co[1], 0xff0000ff, 0x00000000 );
 109
 110    m4x3f cam_new;
 111    m4x3_mul( gate->transport, camera, cam_new );
 112
 113    vg_line_pt3( cam_new[3], 0.3f, 0xff00ff00 );
 114
 115    m4x3f gate_xform;
 116    m4x3_copy( gate->to_world, gate_xform );
 117    m4x3_scalev( gate_xform, (v3f){ gate->dims[0], gate->dims[1], 1.0f } );
 118
 119    m4x3f inverse;
 120    m4x3_invert_affine( cam_new, inverse );
 121
 122    m4x4f view;
 123    m4x3_expand( inverse, view );
 124
 125    v4f surface;
 126    m3x3_mulv( gate->recv_to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 127    surface[3] = v3_dot( surface, gate->co[1] );
 128
 129    m4x4f projection;
 130    pipeline_projection( projection, 0.1f, 900.0f );
 131
 132    m4x3_mulp( inverse, surface, surface );
 133    surface[3] = -fabsf(surface[3]);
 134    plane_clip_projection( projection, surface );
 135
 136    m4x4_mul( projection, view, projection );
 137
 138 #ifndef GATE_RENDER_PERFORMANCE
 139       fb_use( &grender.fb );
 140       glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
 141       glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 142 #else
 143       shader_gatelq_use();
 144       shader_gatelq_uPv( vg.pv );
 145       shader_gatelq_uMdl( gate_xform );
 146       shader_gatelq_uCam( viewpos );
 147       shader_gatelq_uTime( vg.time*0.25f );
 148       shader_gatelq_uInvRes( (v2f){
 149             1.0f / (float)vg.window_x,
 150             1.0f / (float)vg.window_y });
 151
 152       glEnable( GL_STENCIL_TEST );
 153       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 154       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 155       glStencilMask( 0xFF );
 156
 157       mesh_bind( &grender.mdl );
 158       mesh_draw( &grender.mdl );
 159
 160       glClear( GL_DEPTH_BUFFER_BIT );
 161       glStencilFunc( GL_EQUAL, 1, 0xFF );
 162       glStencilMask( 0x00 );
 163 #endif
 164
 165    render_world( projection, cam_new );
 166
 167 #ifndef GATE_RENDER_PERFORMANCE
 168
 169       /*
 170        * NOTE: Need to find a way to draw a stencil buffer into the water
 171        *       rendering
 172        */
 173
 174       render_water_texture( cam_new );
 175       fb_use( &grender.fb );
 176
 177       render_water_surface( projection, cam_new );
 178       fb_use( NULL );
 179
 180       shader_gate_use();
 181
 182       shader_gate_uPv( vg_pv );
 183       shader_gate_uMdl( gate_xform );
 184
 185       fb_bindtex( &grender.fb, 0 );
 186
 187       shader_gate_uCam( viewpos );
 188       shader_gate_uTexMain( 0 );
 189       shader_gate_uTexWater( 1 );
 190       shader_gate_uTime( vg_time*0.25f );
 191       shader_gate_uInvRes( (v2f){
 192             1.0f / (float)vg_window_x,
 193             1.0f / (float)vg_window_y });
 194
 195       glEnable(GL_BLEND);
 196       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 197       glBlendEquation(GL_FUNC_ADD);
 198
 199       mesh_bind( &grender.mdl );
 200       mesh_draw( &grender.mdl );
 201
 202       glDisable(GL_BLEND);
 203 #else
 204       glDisable( GL_STENCIL_TEST );
 205
 206       render_water_texture( cam_new );
 207       fb_use( NULL );
 208       glEnable( GL_STENCIL_TEST );
 209
 210       render_water_surface( projection, cam_new );
 211
 212       glStencilMask( 0xFF );
 213       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 214       glDisable( GL_STENCIL_TEST );
 215 #endif
 216
 217    return 1;
 218 }
 219
 220 static int gate_intersect( teleport_gate *gate, v3f pos, v3f last )
 221 {
 222    v4f surface;
 223    m3x3_mulv( gate->to_world, (v3f){0.0f,0.0f,-1.0f}, surface );
 224    surface[3] = v3_dot( surface, gate->co[0] );
 225
 226    v3f v0, c, delta, p0;
 227    v3_sub( pos, last, v0 );
 228    float l = v3_length( v0 );
 229    v3_divs( v0, l, v0 );
 230
 231    v3_muls( surface, surface[3], c );
 232    v3_sub( c, last, delta );
 233
 234    float d = v3_dot(surface, v0);
 235
 236    if( d > 0.00001f )
 237    {
 238       float t = v3_dot(delta, surface) / d;
 239       if( t >= 0.0f && t <= l )
 240       {
 241          v3f local, rel;
 242          v3_muladds( last, v0, t, local );
 243          v3_sub( gate->co[0], local, rel );
 244
 245          v3f vup, vside;
 246          m3x3_mulv( gate->to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 247          m3x3_mulv( gate->to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 248
 249          v2f xy = { v3_dot( rel, vside ), v3_dot( rel, vup ) };
 250
 251          if( fabsf(xy[0]) <= gate->dims[0] && fabsf(xy[1]) <= gate->dims[1] )
 252          {
 253             return 1;
 254          }
 255       }
 256    }
 257
 258    return 0;
 259 }
 260
 261 #endif /* WORLD_GATE_H */