world_water.h

   1 /*
   2  * Copyright (C) 2021-2022 Mt.ZERO Software, Harry Godden - All Rights Reserved
   3  */
   4
   5 #ifndef WATER_H
   6 #define WATER_H
   7
   8 #include "world.h"
   9 #include "render.h"
  10 #include "shaders/scene_water.h"
  11 #include "shaders/scene_water_fast.h"
  12 #include "scene.h"
  13
  14 VG_STATIC GLuint tex_water_surf;
  15
  16 VG_STATIC void world_water_init(void)
  17 {
  18    vg_info( "world_water_init\n" );
  19    shader_scene_water_register();
  20    shader_scene_water_fast_register();
  21
  22    vg_tex2d_load_qoi_async_file( "textures/water_surf.qoi",
  23                                  VG_TEX2D_LINEAR|VG_TEX2D_REPEAT,
  24                                  &tex_water_surf );
  25
  26    vg_success( "done\n" );
  27 }
  28
  29 VG_STATIC void water_set_surface( world_instance *world, float height )
  30 {
  31    world->water.height = height;
  32    v4_copy( (v4f){ 0.0f, 1.0f, 0.0f, height }, world->water.plane );
  33 }
  34
  35 VG_STATIC void world_link_lighting_ub( world_instance *world, GLuint shader );
  36 VG_STATIC void world_bind_position_texture( world_instance *world,
  37                                             GLuint shader, GLuint location,
  38                                             int slot );
  39 VG_STATIC void world_bind_light_array( world_instance *world,
  40                                        GLuint shader, GLuint location,
  41                                        int slot );
  42 VG_STATIC void world_bind_light_index( world_instance *world,
  43                                        GLuint shader, GLuint location,
  44                                        int slot );
  45
  46 /*
  47  * Does not write motion vectors
  48  */
  49 VG_STATIC void render_water_texture( world_instance *world, camera *cam,
  50                                      int layer_depth )
  51 {
  52    if( !world->water.enabled || (vg.quality_profile == k_quality_profile_low) )
  53       return;
  54
  55    /* Draw reflection buffa */
  56    render_fb_bind( gpipeline.fb_water_reflection, 1 );
  57    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
  58
  59    /*
  60     * Create flipped view matrix. Don't care about motion vectors
  61     */
  62    float cam_height = cam->transform[3][1] - world->water.height;
  63
  64    camera water_cam;
  65    water_cam.farz = cam->farz;
  66    water_cam.nearz = cam->nearz;
  67    v3_copy( cam->transform[3], water_cam.transform[3] );
  68    water_cam.transform[3][1] -= 2.0f * cam_height;
  69
  70    m3x3f flip;
  71    m3x3_identity( flip );
  72    flip[1][1] = -1.0f;
  73    m3x3_mul( flip, cam->transform, water_cam.transform );
  74
  75    camera_update_view( &water_cam );
  76
  77    /*
  78     * Create clipped projection
  79     */
  80    v4f clippa = { 0.0f, 1.0f, 0.0f, world->water.height-0.1f };
  81    m4x3_mulp( water_cam.transform_inverse, clippa, clippa );
  82    clippa[3] *= -1.0f;
  83
  84    m4x4_copy( cam->mtx.p, water_cam.mtx.p );
  85    m4x4_clip_projection( water_cam.mtx.p, clippa );
  86
  87    camera_finalize( &water_cam );
  88
  89    /*
  90     * Draw world
  91     */
  92    glEnable( GL_DEPTH_TEST );
  93    glDisable( GL_BLEND );
  94    glCullFace( GL_FRONT );
  95    render_world( world, &water_cam, layer_depth );
  96    glCullFace( GL_BACK );
  97
  98    /*
  99     * Create beneath view matrix
 100     */
 101    camera beneath_cam;
 102    render_fb_bind( gpipeline.fb_water_beneath, 1 );
 103    glClearColor( 1.0f, 0.0f, 0.0f, 0.0f );
 104    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 105
 106    m4x3_copy( cam->transform, beneath_cam.transform );
 107    camera_update_view( &beneath_cam );
 108
 109    float bias = -(cam->transform[3][1]-world->water.height)*0.1f;
 110
 111    v4f clippb = { 0.0f, -1.0f, 0.0f, -(world->water.height) + bias };
 112    m4x3_mulp( beneath_cam.transform_inverse, clippb, clippb );
 113    clippb[3] *= -1.0f;
 114
 115    m4x4_copy( cam->mtx.p, beneath_cam.mtx.p );
 116    m4x4_clip_projection( beneath_cam.mtx.p, clippb );
 117    camera_finalize( &beneath_cam );
 118
 119    glEnable( GL_DEPTH_TEST );
 120    glDisable( GL_BLEND );
 121    render_world_depth( world, &beneath_cam );
 122    //glViewport( 0,0, g_render_x, g_render_y );
 123 }
 124
 125 VG_STATIC void render_water_surface( world_instance *world, camera *cam )
 126 {
 127    if( !world->water.enabled )
 128       return;
 129
 130    if( vg.quality_profile == k_quality_profile_high ){
 131       /* Draw surface */
 132       shader_scene_water_use();
 133
 134       render_fb_bind_texture( gpipeline.fb_water_reflection, 0, 0 );
 135       shader_scene_water_uTexMain( 0 );
 136
 137       glActiveTexture( GL_TEXTURE1 );
 138       glBindTexture( GL_TEXTURE_2D, tex_water_surf );
 139       shader_scene_water_uTexDudv( 1 );
 140
 141       shader_scene_water_uInvRes( (v2f){
 142             1.0f / (float)vg.window_x,
 143             1.0f / (float)vg.window_y });
 144
 145       world_link_lighting_ub( world, _shader_scene_water.id );
 146       world_bind_position_texture( world, _shader_scene_water.id,
 147                                     _uniform_scene_water_g_world_depth, 2 );
 148       world_bind_light_array( world, _shader_scene_water.id,
 149                                     _uniform_scene_water_uLightsArray, 4 );
 150       world_bind_light_index( world, _shader_scene_water.id,
 151                               _uniform_scene_water_uLightsIndex, 5 );
 152
 153       render_fb_bind_texture( gpipeline.fb_water_beneath, 0, 3 );
 154       shader_scene_water_uTexBack( 3 );
 155       shader_scene_water_uTime( world_global.time );
 156       shader_scene_water_uCamera( cam->transform[3] );
 157       shader_scene_water_uSurfaceY( world->water.height );
 158
 159       shader_scene_water_uPv( cam->mtx.pv );
 160       shader_scene_water_uPvmPrev( cam->mtx_prev.pv );
 161
 162       m4x3f full;
 163       m4x3_identity( full );
 164       shader_scene_water_uMdl( full );
 165
 166       glEnable(GL_BLEND);
 167       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 168       glBlendEquation(GL_FUNC_ADD);
 169
 170       mesh_bind( &world->mesh_no_collide );
 171
 172       for( int i=0; i<world->surface_count; i++ ){
 173          struct world_surface *mat = &world->surfaces[i];
 174
 175          if( mat->info.shader == k_shader_water ){
 176             shader_scene_water_uShoreColour( mat->info.colour );
 177             shader_scene_water_uOceanColour( mat->info.colour1 );
 178
 179             mdl_draw_submesh( &mat->sm_no_collide );
 180          }
 181       }
 182
 183       glDisable(GL_BLEND);
 184    }
 185    else if( vg.quality_profile == k_quality_profile_low ){
 186       shader_scene_water_fast_use();
 187
 188       glActiveTexture( GL_TEXTURE1 );
 189       glBindTexture( GL_TEXTURE_2D, tex_water_surf );
 190       shader_scene_water_fast_uTexDudv( 1 );
 191
 192       shader_scene_water_fast_uTime( world_global.time );
 193       shader_scene_water_fast_uCamera( cam->transform[3] );
 194       shader_scene_water_fast_uSurfaceY( world->water.height );
 195       world_link_lighting_ub( world, _shader_scene_water_fast.id );
 196       world_bind_position_texture( world, _shader_scene_water_fast.id,
 197                                    _uniform_scene_water_fast_g_world_depth, 2 );
 198       world_bind_light_array( world, _shader_scene_water_fast.id,
 199                                     _uniform_scene_water_fast_uLightsArray, 4 );
 200
 201       m4x3f full;
 202       m4x3_identity( full );
 203       shader_scene_water_fast_uMdl( full );
 204       shader_scene_water_fast_uPv( cam->mtx.pv );
 205       shader_scene_water_fast_uPvmPrev( cam->mtx_prev.pv );
 206
 207       glEnable(GL_BLEND);
 208       glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
 209       glBlendEquation(GL_FUNC_ADD);
 210
 211       mesh_bind( &world->mesh_no_collide );
 212
 213       for( int i=0; i<world->surface_count; i++ ){
 214          struct world_surface *mat = &world->surfaces[i];
 215
 216          if( mat->info.shader == k_shader_water ){
 217             shader_scene_water_fast_uShoreColour( mat->info.colour );
 218             shader_scene_water_fast_uOceanColour( mat->info.colour1 );
 219
 220             mdl_draw_submesh( &mat->sm_no_collide );
 221          }
 222       }
 223
 224       glDisable(GL_BLEND);
 225    }
 226 }
 227
 228 #endif /* WATER_H */