shaders/scene_position.h

   1 #ifndef SHADER_scene_position_H
   2 #define SHADER_scene_position_H
   3 static void shader_scene_position_link(void);
   4 static void shader_scene_position_register(void);
   5 static struct vg_shader _shader_scene_position = {
   6    .name = "scene_position",
   7    .link = shader_scene_position_link,
   8    .vs =
   9 {
  10 .orig_file = "shaders/scene.vs",
  11 .static_src =
  12 "layout (location=0) in vec3  a_co;\n"
  13 "layout (location=1) in vec4  a_norm;\n"
  14 "layout (location=2) in vec2  a_uv;\n"
  15 "\n"
  16 "#line       1        1 \n"
  17 "const float k_motion_lerp_amount = 0.01;\n"
  18 "\n"
  19 "#line      2        0 \n"
  20 "\n"
  21 "out vec3 aMotionVec0;\n"
  22 "out vec3 aMotionVec1;\n"
  23 "\n"
  24 "void vs_motion_out( vec4 vproj0, vec4 vproj1 )\n"
  25 "{\n"
  26 "   // This magically solves some artifacting errors!\n"
  27 "   //\n"
  28 "   vproj1 = vproj0*(1.0-k_motion_lerp_amount) + vproj1*k_motion_lerp_amount;\n"
  29 "\n"
  30 "   aMotionVec0 = vec3( vproj0.xy, vproj0.w );\n"
  31 "   aMotionVec1 = vec3( vproj1.xy, vproj1.w );\n"
  32 "}\n"
  33 "\n"
  34 "#line      6        0 \n"
  35 "\n"
  36 "uniform mat4x3 uMdl;\n"
  37 "uniform mat4   uPv;\n"
  38 "uniform mat4   uPvmPrev;\n"
  39 "\n"
  40 "out vec2 aUv;\n"
  41 "out vec4 aNorm;\n"
  42 "out vec3 aCo;\n"
  43 "out vec3 aWorldCo;\n"
  44 "\n"
  45 "void main()\n"
  46 "{\n"
  47 "   vec3 world_pos0 = uMdl     * vec4( a_co, 1.0 );\n"
  48 "   vec4 vproj0     = uPv      * vec4( world_pos0, 1.0 );\n"
  49 "   vec4 vproj1     = uPvmPrev * vec4( a_co, 1.0 );\n"
  50 "\n"
  51 "   vs_motion_out( vproj0, vproj1 );\n"
  52 "\n"
  53 "   gl_Position = vproj0;\n"
  54 "\n"
  55 "   aUv = a_uv;\n"
  56 "   aNorm = vec4( mat3(uMdl) * a_norm.xyz, a_norm.w );\n"
  57 "   aCo = a_co;\n"
  58 "   aWorldCo = world_pos0;\n"
  59 "}\n"
  60 ""},
  61    .fs =
  62 {
  63 .orig_file = "shaders/scene_position.fs",
  64 .static_src =
  65 "out vec4 FragColor;\n"
  66 "\n"
  67 "uniform vec3 uCamera;\n"
  68 "uniform vec3 uBoard0;\n"
  69 "uniform vec3 uBoard1;\n"
  70 "\n"
  71 "#line       1        1 \n"
  72 "// :D\n"
  73 "\n"
  74 "in vec2 aUv;\n"
  75 "in vec4 aNorm;\n"
  76 "in vec3 aCo;\n"
  77 "in vec3 aWorldCo;\n"
  78 "\n"
  79 "#line       1        1 \n"
  80 "layout (location = 0) out vec4 oColour;\n"
  81 "\n"
  82 "// OpenGL wiki: Recommends do not use vec3 because of drivers. hence the v4s...\n"
  83 "layout (std140) uniform ub_world_lighting\n"
  84 "{\n"
  85 "   vec4 g_cube_min;\n"
  86 "   vec4 g_cube_inv_range;\n"
  87 "\n"
  88 "   vec4 g_water_plane;\n"
  89 "   vec4 g_depth_bounds;\n"
  90 "\n"
  91 "   vec4 g_daysky_colour;\n"
  92 "   vec4 g_nightsky_colour;\n"
  93 "   vec4 g_sunset_colour;\n"
  94 "   vec4 g_ambient_colour;\n"
  95 "   vec4 g_sunset_ambient;\n"
  96 "   vec4 g_sun_colour;\n"
  97 "   vec4 g_sun_dir;\n"
  98 "   vec4 g_board_0;\n"
  99 "   vec4 g_board_1;\n"
 100 "\n"
 101 "   float g_water_fog;\n"
 102 "   float g_time;\n"
 103 "   float g_realtime;\n"
 104 "   float g_shadow_length;\n"
 105 "   float g_shadow_spread;\n"
 106 "\n"
 107 "   float g_time_of_day;\n"
 108 "   float g_day_phase;\n"
 109 "   float g_sunset_phase;\n"
 110 "\n"
 111 "   int g_light_preview;\n"
 112 "   int g_shadow_samples;\n"
 113 "\n"
 114 "   int g_debug_indices;\n"
 115 "   int g_debug_complexity;\n"
 116 "};\n"
 117 "\n"
 118 "uniform sampler2D g_world_depth;\n"
 119 "uniform samplerBuffer uLightsArray;\n"
 120 "uniform usampler3D uLightsIndex;\n"
 121 "\n"
 122 "#line       1        1 \n"
 123 "//const vec3  DAYSKY_COLOUR   = vec3( 0.37, 0.54, 0.97 );\n"
 124 "//const vec3  NIGHTSKY_COLOUR = vec3( 0.03, 0.05, 0.20 );\n"
 125 "//const vec3  SUNSET_COLOUR   = vec3( 1.00, 0.32, 0.01 );\n"
 126 "//const vec3  AMBIENT_COLOUR  = vec3( 0.13, 0.17, 0.35 );\n"
 127 "//const vec3  SUNSET_AMBIENT  = vec3( 0.25, 0.17, 0.51 );\n"
 128 "//const vec3  SUN_COLOUR      = vec3( 1.10, 0.89, 0.35 );\n"
 129 "\n"
 130 "const float SUN_ANGLE       = 0.0001;\n"
 131 "const float PI              = 3.14159265;\n"
 132 "\n"
 133 "//struct world_info\n"
 134 "//{\n"
 135 "//   float time,\n"
 136 "//         time_of_day,\n"
 137 "//         day_phase,\n"
 138 "//         sunset_phase;\n"
 139 "//   \n"
 140 "//   vec3 sun_dir;\n"
 141 "//};\n"
 142 "\n"
 143 "float luminance( vec3 v )\n"
 144 "{\n"
 145 "   return dot( v, vec3(0.2126, 0.7152, 0.0722) );\n"
 146 "}\n"
 147 "\n"
 148 "vec3 clearskies_ambient( vec3 dir )\n"
 149 "{\n"
 150 "   float sun_azimuth  = g_sunset_phase * (dot( dir.xz, g_sun_dir.xz )*0.4+0.6);\n"
 151 "   float sky_gradient = dir.y;\n"
 152 "   \n"
 153 "   /* Blend phase colours */\n"
 154 "   vec3 ambient  = g_daysky_colour.rgb   * (g_day_phase-g_sunset_phase*0.1);\n"
 155 "        ambient += g_sunset_colour.rgb   * (1.0-dir.y*0.5)*sun_azimuth;\n"
 156 "        ambient += g_nightsky_colour.rgb * (1.0-g_day_phase);\n"
 157 "   \n"
 158 "   /* Add gradient */\n"
 159 "        ambient -= sky_gradient * luminance(ambient);\n"
 160 "        \n"
 161 "   return ambient;\n"
 162 "}\n"
 163 "\n"
 164 "vec3 clearskies_sky( vec3 ray_dir )\n"
 165 "{\n"
 166 "   ray_dir.y = abs( ray_dir.y );\n"
 167 "   vec3 sky_colour  = clearskies_ambient( ray_dir );\n"
 168 "   \n"
 169 "   /* Sun */\n"
 170 "   float sun_theta  = dot( ray_dir, g_sun_dir.xyz );\n"
 171 "   float sun_size   = max( 0.0, sun_theta * 0.5 + 0.5 + SUN_ANGLE );\n"
 172 "   float sun_shape  = pow( sun_size, 2000.0 );\n"
 173 "         sun_shape += sun_size * max(g_sun_dir.y,0.0) * 0.5;\n"
 174 "         \n"
 175 "   vec3 sun_colour  = mix( vec3(1.0), g_sunset_colour.rgb, g_sunset_phase*0.5 );\n"
 176 "        sun_colour *= sun_shape;\n"
 177 "   \n"
 178 "   vec3 composite   = sky_colour + sun_colour;\n"
 179 "   return composite;\n"
 180 "}\n"
 181 "\n"
 182 "vec3 clearskies_lighting( vec3 normal, float shadow, vec3 halfview )\n"
 183 "{\n"
 184 "   float fresnel = 1.0 - abs(dot(normal,halfview));\n"
 185 "\n"
 186 "   vec3  reflect_colour = mix( g_daysky_colour.rgb, g_sunset_colour.rgb, \n"
 187 "                               g_sunset_phase );\n"
 188 "\n"
 189 "   vec3  sky_reflection = 0.5 * fresnel * reflect_colour;\n"
 190 "   vec3  light_sun      = max(0.0,dot(normal,g_sun_dir.xyz)*0.75+0.25) \n"
 191 "                           * g_sun_colour.rgb * g_day_phase;\n"
 192 "\n"
 193 "   float scaled_shadow = max( shadow, 1.0 - max(g_sun_dir.y,0.0) );\n"
 194 "   vec3 ambient = mix( g_ambient_colour.rgb, g_sunset_ambient.rgb, \n"
 195 "                       g_sunset_phase );\n"
 196 "\n"
 197 "   return ambient + (light_sun + sky_reflection) * shadow;\n"
 198 "}\n"
 199 "\n"
 200 "#line     44        0 \n"
 201 "\n"
 202 "float world_depth_sample( vec3 pos )\n"
 203 "{\n"
 204 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 205 "   return texture( g_world_depth, depth_coord ).r;\n"
 206 "}\n"
 207 "\n"
 208 "float world_water_depth( vec3 pos )\n"
 209 "{\n"
 210 "   float ref_depth = g_water_plane.y*g_water_plane.w;\n"
 211 "   return world_depth_sample( pos ) - ref_depth;\n"
 212 "}\n"
 213 "\n"
 214 "float shadow_sample( vec3 co ){\n"
 215 "   float height_sample = world_depth_sample( co );\n"
 216 "\n"
 217 "   float fdelta = height_sample - co.y;\n"
 218 "   return clamp( fdelta, 0.2, 0.4 )-0.2;\n"
 219 "}\n"
 220 "\n"
 221 "float newlight_compute_sun_shadow( vec3 co, vec3 dir ){\n"
 222 "   if( g_shadow_samples == 0 ){\n"
 223 "      return 1.0;\n"
 224 "   }\n"
 225 "\n"
 226 "   float fspread = g_shadow_spread;\n"
 227 "   float flength = g_shadow_length;\n"
 228 "\n"
 229 "   float famt = 0.0;\n"
 230 "   famt += shadow_sample(co+(dir+vec3(-0.56,0.55, 0.30)*fspread)*flength*0.1);\n"
 231 "   famt += shadow_sample(co+(dir+vec3( 0.80,0.68, 0.34)*fspread)*flength*0.2);\n"
 232 "   famt += shadow_sample(co+(dir+vec3( 0.78,0.07,-0.06)*fspread)*flength*0.3);\n"
 233 "   famt += shadow_sample(co+(dir+vec3(-0.59,0.07,-0.42)*fspread)*flength*0.4);\n"
 234 "\n"
 235 "   //famt+=shadow_sample(co+(dir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 236 "   //famt+=shadow_sample(co+(dir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 237 "   //famt+=shadow_sample(co+(dir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 238 "   //famt+=shadow_sample(co+(dir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 239 "\n"
 240 "   return 1.0 - famt;\n"
 241 "}\n"
 242 "\n"
 243 "float newlight_specular( vec3 wnormal, vec3 dir, vec3 halfview, float exponent )\n"
 244 "{\n"
 245 "   vec3 specdir = reflect( -dir, wnormal );\n"
 246 "   return pow(max(dot( halfview, specdir ), 0.0), exponent);\n"
 247 "}\n"
 248 "\n"
 249 "vec3 scene_apply_fog( vec3 vfrag, vec3 colour, float fdist )\n"
 250 "{\n"
 251 "   float dist = pow(fdist*0.0010,0.78);\n"
 252 "   return mix( vfrag, colour, min( 1.0, dist ) );\n"
 253 "}\n"
 254 "\n"
 255 "vec3 rand33(vec3 p3)\n"
 256 "{\n"
 257 "       p3 = fract(p3 * vec3(.1031, .1030, .0973));\n"
 258 "   p3 += dot(p3, p3.yxz+33.33);\n"
 259 "   return fract((p3.xxy + p3.yxx)*p3.zyx);\n"
 260 "}\n"
 261 "\n"
 262 "vec3 scene_calculate_light( int light_index, \n"
 263 "                            vec3 halfview, vec3 co, vec3 normal )\n"
 264 "{\n"
 265 "   vec4 light_colour = texelFetch( uLightsArray, light_index+0 );\n"
 266 "   vec4 light_co     = texelFetch( uLightsArray, light_index+1 );\n"
 267 "   vec4 light_dir    = texelFetch( uLightsArray, light_index+2 );\n"
 268 "\n"
 269 "   vec3 light_delta = light_co.xyz-co;\n"
 270 "   float dist2 = dot(light_delta,light_delta);\n"
 271 "\n"
 272 "   light_delta = normalize( light_delta );\n"
 273 "\n"
 274 "   float quadratic = dist2*100.0;\n"
 275 "   float attenuation  = 1.0/( 1.0 + quadratic );\n"
 276 "         attenuation *= max( dot( light_delta, normal ), 0.0 );\n"
 277 "\n"
 278 "   float falloff = max( 0.0, 1.0-(dist2*light_co.w) );\n"
 279 "\n"
 280 "   if( light_dir.w < 0.999999 ){\n"
 281 "      float spot_theta = max( 0.0, dot( light_delta, -light_dir.xyz ) );\n"
 282 "      falloff *= max( 0.0, (spot_theta - light_dir.w) / (1.0-light_dir.w) );\n"
 283 "   }\n"
 284 "\n"
 285 "   return light_colour.rgb * attenuation * falloff \n"
 286 "            * step( g_day_phase, light_colour.w );\n"
 287 "}\n"
 288 "\n"
 289 "vec3 scene_calculate_packed_light_patch( uint packed_index, \n"
 290 "                                         vec3 halfview, vec3 co, vec3 normal )\n"
 291 "{\n"
 292 "   uint light_count = packed_index & 0x3u;\n"
 293 "\n"
 294 "   vec3 l = vec3(0.0);\n"
 295 "\n"
 296 "   if( light_count >= 1u ){\n"
 297 "      int index_0 = int( ((packed_index >>  2u) & 0x3ffu) * 3u );\n"
 298 "      int index_1 = int( ((packed_index >> 12u) & 0x3ffu) * 3u );\n"
 299 "      int index_2 = int( ((packed_index >> 22u) & 0x3ffu) * 3u );\n"
 300 "\n"
 301 "      l += scene_calculate_light( index_0, halfview, co, normal );\n"
 302 "\n"
 303 "      if( light_count >= 2u ){\n"
 304 "         l += scene_calculate_light( index_1, halfview, co, normal );\n"
 305 "\n"
 306 "         if( light_count >= 3u ){\n"
 307 "            l += scene_calculate_light( index_2, halfview, co, normal );\n"
 308 "         }\n"
 309 "      }\n"
 310 "   }\n"
 311 "\n"
 312 "   return l;\n"
 313 "}\n"
 314 "\n"
 315 "vec3 world_compute_lighting( vec3 diffuse, vec3 normal, vec3 co,\n"
 316 "                             float light_mask )\n"
 317 "{\n"
 318 "   if( g_light_preview == 1 )\n"
 319 "      diffuse = vec3(0.75);\n"
 320 "\n"
 321 "   // Lighting\n"
 322 "   vec3 halfview = uCamera - co;\n"
 323 "   float fdist = length(halfview);\n"
 324 "   halfview /= fdist;\n"
 325 "\n"
 326 "   float world_shadow = newlight_compute_sun_shadow( \n"
 327 "               co, g_sun_dir.xyz * (1.0/(max(g_sun_dir.y,0.0)+0.2)) );\n"
 328 "\n"
 329 "   vec3 total_light = clearskies_lighting( \n"
 330 "                           normal, min( light_mask, world_shadow ), halfview );\n"
 331 "\n"
 332 "   vec3 cube_coord = (co - g_cube_min.xyz) * g_cube_inv_range.xyz;\n"
 333 "        cube_coord = floor( cube_coord );\n"
 334 "\n"
 335 "   if( g_debug_indices == 1 )\n"
 336 "   {\n"
 337 "      return rand33(cube_coord);\n"
 338 "   }\n"
 339 "\n"
 340 "   if( g_debug_complexity == 1 )\n"
 341 "   {\n"
 342 "      ivec3 coord = ivec3( cube_coord );\n"
 343 "      uvec4 index_sample = texelFetch( uLightsIndex, coord, 0 );\n"
 344 "\n"
 345 "      uint light_count = (index_sample.x & 0x3u) + (index_sample.y & 0x3u);\n"
 346 "      return vec3( float(light_count)*(1.0/6.0), 0.0, 0.5 );\n"
 347 "   }\n"
 348 "\n"
 349 "   // FIXME: this coord should absolutely must be clamped!\n"
 350 "   \n"
 351 "   ivec3 coord = ivec3( cube_coord );\n"
 352 "   uvec4 index_sample = texelFetch( uLightsIndex, coord, 0 );\n"
 353 "\n"
 354 "   total_light += \n"
 355 "      scene_calculate_packed_light_patch( index_sample.x,\n"
 356 "                                          halfview, co, normal ) \n"
 357 "                                          * light_mask;\n"
 358 "   total_light += \n"
 359 "      scene_calculate_packed_light_patch( index_sample.y,\n"
 360 "                                          halfview, co, normal )\n"
 361 "                                          * light_mask;\n"
 362 "\n"
 363 "   // Take a section of the sky function to give us a matching fog colour\n"
 364 "\n"
 365 "   vec3 fog_colour  = clearskies_ambient( -halfview );\n"
 366 "   float sun_theta  = dot( -halfview, g_sun_dir.xyz );\n"
 367 "   float sun_size   = max( 0.0, sun_theta * 0.5 + 0.5 );\n"
 368 "   float sun_shape  = sun_size * max(g_sun_dir.y,0.0) * 0.5;\n"
 369 "         \n"
 370 "   vec3 sun_colour  = mix( vec3(1.0), g_sunset_colour.rgb, g_sunset_phase*0.5 );\n"
 371 "        sun_colour *= sun_shape;\n"
 372 "\n"
 373 "   fog_colour += sun_colour;\n"
 374 "   return scene_apply_fog( diffuse * total_light, fog_colour, fdist );\n"
 375 "}\n"
 376 "\n"
 377 "#line      9        0 \n"
 378 "\n"
 379 "float sdLine( vec3 p, vec3 a, vec3 b )\n"
 380 "{\n"
 381 "  vec3 pa = p - a;\n"
 382 "  vec3 ba = b - a;\n"
 383 "\n"
 384 "  float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );\n"
 385 "  return length( pa - ba*h );\n"
 386 "}\n"
 387 "\n"
 388 "float compute_board_shadow()\n"
 389 "{\n"
 390 "   // player shadow\n"
 391 "   float dist_to_player = max( 0.0, sdLine( aWorldCo, g_board_0.xyz,\n"
 392 "                                                      g_board_1.xyz )-0.1 );\n"
 393 "   float player_shadow = max( 1.0-dist_to_player*2.7, 0.0 );\n"
 394 "   player_shadow *= player_shadow*player_shadow*player_shadow;\n"
 395 "\n"
 396 "   return 1.0 - player_shadow*0.8;\n"
 397 "}\n"
 398 "\n"
 399 "vec3 scene_compute_lighting( vec3 diffuse, vec3 normal, vec3 co )\n"
 400 "{\n"
 401 "   return world_compute_lighting( diffuse, normal, co, compute_board_shadow() );\n"
 402 "}\n"
 403 "\n"
 404 "#line      8        0 \n"
 405 "\n"
 406 "void main()\n"
 407 "{\n"
 408 "   float height_full = aWorldCo.y;\n"
 409 "   float height_water = height_full;\n"
 410 "\n"
 411 "   if( height_water > (g_water_plane.y * g_water_plane.w) + 2.0 )\n"
 412 "      height_water = -99999.9;\n"
 413 "\n"
 414 "   FragColor = vec4( height_full, height_water, 0.0, 0.0 );\n"
 415 "}\n"
 416 ""},
 417 };
 418
 419 static GLuint _uniform_scene_position_uMdl;
 420 static GLuint _uniform_scene_position_uPv;
 421 static GLuint _uniform_scene_position_uPvmPrev;
 422 static GLuint _uniform_scene_position_uCamera;
 423 static GLuint _uniform_scene_position_uBoard0;
 424 static GLuint _uniform_scene_position_uBoard1;
 425 static GLuint _uniform_scene_position_g_world_depth;
 426 static GLuint _uniform_scene_position_uLightsArray;
 427 static GLuint _uniform_scene_position_uLightsIndex;
 428 static void shader_scene_position_uMdl(m4x3f m){
 429    glUniformMatrix4x3fv(_uniform_scene_position_uMdl,1,GL_FALSE,(float*)m);
 430 }
 431 static void shader_scene_position_uPv(m4x4f m){
 432    glUniformMatrix4fv(_uniform_scene_position_uPv,1,GL_FALSE,(float*)m);
 433 }
 434 static void shader_scene_position_uPvmPrev(m4x4f m){
 435    glUniformMatrix4fv(_uniform_scene_position_uPvmPrev,1,GL_FALSE,(float*)m);
 436 }
 437 static void shader_scene_position_uCamera(v3f v){
 438    glUniform3fv(_uniform_scene_position_uCamera,1,v);
 439 }
 440 static void shader_scene_position_uBoard0(v3f v){
 441    glUniform3fv(_uniform_scene_position_uBoard0,1,v);
 442 }
 443 static void shader_scene_position_uBoard1(v3f v){
 444    glUniform3fv(_uniform_scene_position_uBoard1,1,v);
 445 }
 446 static void shader_scene_position_g_world_depth(int i){
 447    glUniform1i(_uniform_scene_position_g_world_depth,i);
 448 }
 449 static void shader_scene_position_register(void){
 450    vg_shader_register( &_shader_scene_position );
 451 }
 452 static void shader_scene_position_use(void){ glUseProgram(_shader_scene_position.id); }
 453 static void shader_scene_position_link(void){
 454    _uniform_scene_position_uMdl = glGetUniformLocation( _shader_scene_position.id, "uMdl" );
 455    _uniform_scene_position_uPv = glGetUniformLocation( _shader_scene_position.id, "uPv" );
 456    _uniform_scene_position_uPvmPrev = glGetUniformLocation( _shader_scene_position.id, "uPvmPrev" );
 457    _uniform_scene_position_uCamera = glGetUniformLocation( _shader_scene_position.id, "uCamera" );
 458    _uniform_scene_position_uBoard0 = glGetUniformLocation( _shader_scene_position.id, "uBoard0" );
 459    _uniform_scene_position_uBoard1 = glGetUniformLocation( _shader_scene_position.id, "uBoard1" );
 460    _uniform_scene_position_g_world_depth = glGetUniformLocation( _shader_scene_position.id, "g_world_depth" );
 461    _uniform_scene_position_uLightsArray = glGetUniformLocation( _shader_scene_position.id, "uLightsArray" );
 462    _uniform_scene_position_uLightsIndex = glGetUniformLocation( _shader_scene_position.id, "uLightsIndex" );
 463 }
 464 #endif /* SHADER_scene_position_H */