shaders/scene_water.h

   1 #ifndef SHADER_scene_water_H
   2 #define SHADER_scene_water_H
   3 static void shader_scene_water_link(void);
   4 static void shader_scene_water_register(void);
   5 static struct vg_shader _shader_scene_water = {
   6    .name = "scene_water",
   7    .link = shader_scene_water_link,
   8    .vs =
   9 {
  10 .static_src =
  11 "layout (location=0) in vec3  a_co;\n"
  12 "layout (location=1) in vec4  a_norm;\n"
  13 "layout (location=2) in vec2  a_uv;\n"
  14 "layout (location=3) in ivec4 a_lights;\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      7        0 \n"
  35 "\n"
  36 "uniform mat4x3 uMdl;\n"
  37 "uniform mat4   uPv;\n"
  38 "uniform mat4   uPvmPrev;\n"
  39 "uniform samplerBuffer uLightsArray;\n"
  40 "\n"
  41 "out vec2 aUv;\n"
  42 "out vec4 aNorm;\n"
  43 "out vec3 aCo;\n"
  44 "out vec3 aWorldCo;\n"
  45 "flat out vec4 light_colours[3];\n"
  46 "flat out vec4 light_positions[3];\n"
  47 "\n"
  48 "void main()\n"
  49 "{\n"
  50 "   vec3 world_pos0 = uMdl     * vec4( a_co, 1.0 );\n"
  51 "   vec4 vproj0     = uPv      * vec4( world_pos0, 1.0 );\n"
  52 "   vec4 vproj1     = uPvmPrev * vec4( a_co, 1.0 );\n"
  53 "\n"
  54 "   vs_motion_out( vproj0, vproj1 );\n"
  55 "\n"
  56 "   gl_Position = vproj0;\n"
  57 "\n"
  58 "   aUv = a_uv;\n"
  59 "   aNorm = vec4( mat3(uMdl) * a_norm.xyz, a_norm.w );\n"
  60 "   aCo = a_co;\n"
  61 "   aWorldCo = world_pos0;\n"
  62 "\n"
  63 "   // read lights\n"
  64 "   light_colours[0] = texelFetch( uLightsArray, a_lights.x*2+0 );\n"
  65 "   light_colours[1] = texelFetch( uLightsArray, a_lights.y*2+0 );\n"
  66 "   light_colours[2] = texelFetch( uLightsArray, a_lights.z*2+0 );\n"
  67 "   light_positions[0] = texelFetch( uLightsArray, a_lights.x*2+1 );\n"
  68 "   light_positions[1] = texelFetch( uLightsArray, a_lights.y*2+1 );\n"
  69 "   light_positions[2] = texelFetch( uLightsArray, a_lights.z*2+1 );\n"
  70 "}\n"
  71 ""},
  72    .fs =
  73 {
  74 .static_src =
  75 "uniform sampler2D uTexMain;\n"
  76 "uniform sampler2D uTexDudv;\n"
  77 "uniform sampler2D uTexBack;\n"
  78 "\n"
  79 "uniform vec2 uInvRes;\n"
  80 "uniform float uTime;\n"
  81 "uniform vec3 uCamera;\n"
  82 "uniform float uSurfaceY;\n"
  83 "uniform vec3 uBoard0;\n"
  84 "uniform vec3 uBoard1;\n"
  85 "\n"
  86 "uniform vec3 uShoreColour;\n"
  87 "uniform vec3 uOceanColour;\n"
  88 "\n"
  89 "#line       1        1 \n"
  90 "// :D\n"
  91 "\n"
  92 "in vec2 aUv;\n"
  93 "in vec4 aNorm;\n"
  94 "in vec3 aCo;\n"
  95 "in vec3 aWorldCo;\n"
  96 "flat in vec4 light_colours[3];\n"
  97 "flat in vec4 light_positions[3];\n"
  98 "\n"
  99 "#line       1        1 \n"
 100 "layout (location = 0) out vec4 oColour;\n"
 101 "\n"
 102 "layout (std140) uniform ub_world_lighting\n"
 103 "{\n"
 104 "   vec4 g_light_colours[3];\n"
 105 "   vec4 g_light_directions[3];\n"
 106 "   vec4 g_ambient_colour;\n"
 107 "\n"
 108 "   vec4 g_water_plane;\n"
 109 "   vec4 g_depth_bounds;\n"
 110 "   float g_water_fog;\n"
 111 "   int g_light_count;\n"
 112 "   int g_light_preview;\n"
 113 "   int g_shadow_samples;\n"
 114 "\n"
 115 "   // g_time ?\n"
 116 "\n"
 117 "   //vec4 g_point_light_positions[32];\n"
 118 "   //vec4 g_point_light_colours[32];\n"
 119 "};\n"
 120 "\n"
 121 "uniform sampler2D g_world_depth;\n"
 122 "\n"
 123 "float world_depth_sample( vec3 pos )\n"
 124 "{\n"
 125 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 126 "   return texture( g_world_depth, depth_coord ).r;\n"
 127 "}\n"
 128 "\n"
 129 "float world_water_depth( vec3 pos )\n"
 130 "{\n"
 131 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 132 "   float ref_depth = g_water_plane.y*g_water_plane.w;\n"
 133 "   return texture( g_world_depth, depth_coord ).g - ref_depth;\n"
 134 "}\n"
 135 "\n"
 136 "float shadow_sample( vec3 vdir )\n"
 137 "{\n"
 138 "   vec3 sample_pos = aWorldCo + vdir;\n"
 139 "   float height_sample = world_depth_sample( sample_pos );\n"
 140 "\n"
 141 "   float fdelta = height_sample - sample_pos.y;\n"
 142 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 143 "}\n"
 144 "\n"
 145 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 146 "{\n"
 147 "   float dist = pow(fdist*0.0008,1.2);\n"
 148 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 149 "}\n"
 150 "\n"
 151 "\n"
 152 "// New lighting model\n"
 153 "\n"
 154 "vec3 newlight_compute_ambient()\n"
 155 "{\n"
 156 "   return g_ambient_colour.rgb;\n"
 157 "}\n"
 158 "\n"
 159 "float newlight_compute_sun_shadow()\n"
 160 "{\n"
 161 "   if( g_shadow_samples == 0 )\n"
 162 "   {\n"
 163 "      return 1.0;\n"
 164 "   }\n"
 165 "\n"
 166 "   float fspread = g_light_colours[0].w;\n"
 167 "   vec3  vdir = g_light_directions[0].xyz;\n"
 168 "   float flength = g_light_directions[0].w;\n"
 169 "\n"
 170 "   float famt = 0.0;\n"
 171 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 172 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 173 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 174 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 175 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 176 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 177 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 178 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 179 "\n"
 180 "   return 1.0 - famt;\n"
 181 "}\n"
 182 "\n"
 183 "vec3 newlight_compute_world_diffuse( vec3 wnormal )\n"
 184 "{\n"
 185 "   vec3 vtotal = g_ambient_colour.rgb;\n"
 186 "\n"
 187 "   for( int i=0; i<g_light_count; i++ )\n"
 188 "   {\n"
 189 "      vec3 vcolour = g_light_colours[i].rgb;\n"
 190 "      vec3 vdir = g_light_directions[i].xyz;\n"
 191 "\n"
 192 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
 193 "      vtotal += vcolour*flight;\n"
 194 "   }\n"
 195 "\n"
 196 "   return vtotal;\n"
 197 "}\n"
 198 "\n"
 199 "vec3 newlight_compute_sun_spec( vec3 wnormal, vec3 halfview, float fintensity )\n"
 200 "{\n"
 201 "   vec3 vcolour = g_light_colours[0].rgb;\n"
 202 "   vec3 vdir = g_light_directions[0].xyz;\n"
 203 "\n"
 204 "   vec3 specdir = reflect( -vdir, wnormal );\n"
 205 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
 206 "   return vcolour*spec*fintensity;\n"
 207 "}\n"
 208 "\n"
 209 "vec3 newlight_compute_quadratic( vec3 wnormal, vec3 halfview, \n"
 210 "                                 vec3 light_pos, vec3 light_colour )\n"
 211 "{\n"
 212 "   vec3 light_delta = (light_pos-aWorldCo) * 10.0;\n"
 213 "\n"
 214 "   float quadratic = dot(light_delta,light_delta);\n"
 215 "   float attenuation = 1.0f/( 1.0f + quadratic );\n"
 216 "   attenuation *= max( 0.0, dot( normalize(light_delta), wnormal ) );\n"
 217 "\n"
 218 "   return light_colour*attenuation;\n"
 219 "}\n"
 220 "\n"
 221 "#line     11        0 \n"
 222 "\n"
 223 "float sdLine( vec3 p, vec3 a, vec3 b )\n"
 224 "{\n"
 225 "  vec3 pa = p - a;\n"
 226 "  vec3 ba = b - a;\n"
 227 "\n"
 228 "  float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );\n"
 229 "  return length( pa - ba*h );\n"
 230 "}\n"
 231 "\n"
 232 "float compute_board_shadow()\n"
 233 "{\n"
 234 "   // player shadow\n"
 235 "   float dist_to_player = max( 0.0, sdLine( aWorldCo, uBoard0, uBoard1 )-0.1 );\n"
 236 "   float player_shadow = max( 1.0-dist_to_player*2.7, 0.0 );\n"
 237 "   player_shadow *= player_shadow*player_shadow*player_shadow;\n"
 238 "\n"
 239 "   return 1.0 - player_shadow*0.8;\n"
 240 "}\n"
 241 "\n"
 242 "vec3 scene_do_lighting( vec3 diffuse, vec3 wnormal )\n"
 243 "{\n"
 244 "   // Lighting\n"
 245 "   vec3 halfview = uCamera - aWorldCo;\n"
 246 "   float fdist = length(halfview);\n"
 247 "   halfview /= fdist;\n"
 248 "\n"
 249 "   vec3 total_light = newlight_compute_ambient();\n"
 250 "   \n"
 251 "   // Compute world lighting contribution and apply it according to the\n"
 252 "   // shadow map\n"
 253 "   //\n"
 254 "   vec3 world_light = newlight_compute_world_diffuse( wnormal );\n"
 255 "   world_light += newlight_compute_sun_spec( wnormal, halfview, 0.1 );\n"
 256 "\n"
 257 "   float world_shadow = newlight_compute_sun_shadow();\n"
 258 "   float board_shadow = compute_board_shadow();\n"
 259 "\n"
 260 "   total_light += world_light * min( board_shadow, world_shadow );\n"
 261 "\n"
 262 "   // Compute the other lights that exist in the map, not effected by the sun\n"
 263 "   // shadow\n"
 264 "\n"
 265 "   total_light += newlight_compute_quadratic\n"
 266 "                  ( \n"
 267 "                     wnormal, halfview,\n"
 268 "                     light_positions[0].xyz,\n"
 269 "                     light_colours[0].rgb \n"
 270 "                  ) * board_shadow;\n"
 271 "   total_light += newlight_compute_quadratic\n"
 272 "                  ( \n"
 273 "                     wnormal, halfview,\n"
 274 "                     light_positions[1].xyz,\n"
 275 "                     light_colours[1].rgb \n"
 276 "                  ) * board_shadow;\n"
 277 "   total_light += newlight_compute_quadratic\n"
 278 "                  ( \n"
 279 "                     wnormal, halfview,\n"
 280 "                     light_positions[2].xyz,\n"
 281 "                     light_colours[2].rgb \n"
 282 "                  ) * board_shadow;\n"
 283 "\n"
 284 "   return apply_fog( diffuse * total_light, fdist );\n"
 285 "}\n"
 286 "\n"
 287 "#line     16        0 \n"
 288 "#line       1        2 \n"
 289 "const float k_motion_lerp_amount = 0.01;\n"
 290 "\n"
 291 "#line      2        0 \n"
 292 "\n"
 293 "layout (location = 1) out vec2 oMotionVec;\n"
 294 "\n"
 295 "in vec3 aMotionVec0;\n"
 296 "in vec3 aMotionVec1;\n"
 297 "\n"
 298 "void compute_motion_vectors()\n"
 299 "{\n"
 300 "   // Write motion vectors\n"
 301 "   vec2 vmotion0 = aMotionVec0.xy / aMotionVec0.z;\n"
 302 "   vec2 vmotion1 = aMotionVec1.xy / aMotionVec1.z;\n"
 303 "\n"
 304 "   oMotionVec = (vmotion1-vmotion0) * (1.0/k_motion_lerp_amount);\n"
 305 "}\n"
 306 "\n"
 307 "#line     17        0 \n"
 308 "\n"
 309 "vec4 water_surf( vec3 halfview, vec3 vnorm, float depthvalue, \n"
 310 "                 vec4 beneath, vec4 above )\n"
 311 "{\n"
 312 "   vec3 surface_tint = mix(uShoreColour, uOceanColour, depthvalue);\n"
 313 "\n"
 314 "   float ffresnel = pow(1.0-dot( vnorm, halfview ),5.0);\n"
 315 "\n"
 316 "   vec3 lightdir = vec3(0.95,0.0,-0.3);\n"
 317 "   vec3 specdir = reflect( -lightdir, vnorm );\n"
 318 "   float spec = pow(max(dot(halfview,specdir),0.0),20.0)*0.3;\n"
 319 "   \n"
 320 "   // Depth \n"
 321 "   float depthblend = pow( beneath.r, 0.8 );\n"
 322 "\n"
 323 "   // Composite\n"
 324 "   vec3 vsurface = mix(surface_tint, above.rgb, ffresnel );\n"
 325 "   //vsurface += spec;\n"
 326 "\n"
 327 "   return vec4( vsurface,depthblend );\n"
 328 "}\n"
 329 "\n"
 330 "void main()\n"
 331 "{\n"
 332 "   compute_motion_vectors();\n"
 333 "\n"
 334 "   // Create texture coords\n"
 335 "   vec2 ssuv = gl_FragCoord.xy*uInvRes;\n"
 336 "   \n"
 337 "   // Surface colour composite\n"
 338 "   float depthvalue = clamp( -world_water_depth( aCo )*(1.0/25.0), 0.0, 1.0 );\n"
 339 "\n"
 340 "   vec2 world_coord = aCo.xz * 0.008;\n"
 341 "   vec4 time_offsets = vec4( uTime ) * vec4( 0.008, 0.006, 0.003, 0.03 );\n"
 342 "   vec4 dudva = texture( uTexDudv, world_coord + time_offsets.xy )-0.5;\n"
 343 "   vec4 dudvb = texture( uTexDudv, world_coord *7.0 - time_offsets.zw )-0.5;\n"
 344 "\n"
 345 "   vec3 surfnorm = dudva.rgb + dudvb.rgb;\n"
 346 "   surfnorm = normalize(vec3(0.0,1.0,0.0) + dudva.xyz*0.4 + dudvb.xyz*0.1);\n"
 347 "   \n"
 348 "   // Foam\n"
 349 "   float fband = fract( aCo.z*0.02+uTime*0.1+depthvalue*10.0 );\n"
 350 "   fband = step( fband+dudva.a*0.8, 0.3 ) * max((1.0-depthvalue*4.0),0.0);\n"
 351 "\n"
 352 "   // Lighting\n"
 353 "   vec3 halfview = -normalize( aCo-uCamera );\n"
 354 "\n"
 355 "   // Sample textures\n"
 356 "   vec4 above = texture( uTexMain, ssuv+ surfnorm.xz*0.2 );\n"
 357 "   vec4 beneath = texture( uTexBack, ssuv );\n"
 358 "\n"
 359 "   // Fog\n"
 360 "   float fdist = pow(length( aCo.xz-uCamera.xz ) * 0.00047, 2.6);\n"
 361 "\n"
 362 "   // Composite\n"
 363 "   vec4 vsurface = water_surf( halfview, surfnorm, depthvalue, beneath, above );\n"
 364 "   vsurface.a -= fdist;\n"
 365 "   oColour = mix( vsurface, vec4(1.0,1.0,1.0,0.5), fband );\n"
 366 "}\n"
 367 ""},
 368 };
 369
 370 static GLuint _uniform_scene_water_uMdl;
 371 static GLuint _uniform_scene_water_uPv;
 372 static GLuint _uniform_scene_water_uPvmPrev;
 373 static GLuint _uniform_scene_water_uLightsArray;
 374 static GLuint _uniform_scene_water_uTexMain;
 375 static GLuint _uniform_scene_water_uTexDudv;
 376 static GLuint _uniform_scene_water_uTexBack;
 377 static GLuint _uniform_scene_water_uInvRes;
 378 static GLuint _uniform_scene_water_uTime;
 379 static GLuint _uniform_scene_water_uCamera;
 380 static GLuint _uniform_scene_water_uSurfaceY;
 381 static GLuint _uniform_scene_water_uBoard0;
 382 static GLuint _uniform_scene_water_uBoard1;
 383 static GLuint _uniform_scene_water_uShoreColour;
 384 static GLuint _uniform_scene_water_uOceanColour;
 385 static GLuint _uniform_scene_water_g_world_depth;
 386 static void shader_scene_water_uMdl(m4x3f m){
 387    glUniformMatrix4x3fv(_uniform_scene_water_uMdl,1,GL_FALSE,(float*)m);
 388 }
 389 static void shader_scene_water_uPv(m4x4f m){
 390    glUniformMatrix4fv(_uniform_scene_water_uPv,1,GL_FALSE,(float*)m);
 391 }
 392 static void shader_scene_water_uPvmPrev(m4x4f m){
 393    glUniformMatrix4fv(_uniform_scene_water_uPvmPrev,1,GL_FALSE,(float*)m);
 394 }
 395 static void shader_scene_water_uTexMain(int i){
 396    glUniform1i(_uniform_scene_water_uTexMain,i);
 397 }
 398 static void shader_scene_water_uTexDudv(int i){
 399    glUniform1i(_uniform_scene_water_uTexDudv,i);
 400 }
 401 static void shader_scene_water_uTexBack(int i){
 402    glUniform1i(_uniform_scene_water_uTexBack,i);
 403 }
 404 static void shader_scene_water_uInvRes(v2f v){
 405    glUniform2fv(_uniform_scene_water_uInvRes,1,v);
 406 }
 407 static void shader_scene_water_uTime(float f){
 408    glUniform1f(_uniform_scene_water_uTime,f);
 409 }
 410 static void shader_scene_water_uCamera(v3f v){
 411    glUniform3fv(_uniform_scene_water_uCamera,1,v);
 412 }
 413 static void shader_scene_water_uSurfaceY(float f){
 414    glUniform1f(_uniform_scene_water_uSurfaceY,f);
 415 }
 416 static void shader_scene_water_uBoard0(v3f v){
 417    glUniform3fv(_uniform_scene_water_uBoard0,1,v);
 418 }
 419 static void shader_scene_water_uBoard1(v3f v){
 420    glUniform3fv(_uniform_scene_water_uBoard1,1,v);
 421 }
 422 static void shader_scene_water_uShoreColour(v3f v){
 423    glUniform3fv(_uniform_scene_water_uShoreColour,1,v);
 424 }
 425 static void shader_scene_water_uOceanColour(v3f v){
 426    glUniform3fv(_uniform_scene_water_uOceanColour,1,v);
 427 }
 428 static void shader_scene_water_g_world_depth(int i){
 429    glUniform1i(_uniform_scene_water_g_world_depth,i);
 430 }
 431 static void shader_scene_water_register(void){
 432    vg_shader_register( &_shader_scene_water );
 433 }
 434 static void shader_scene_water_use(void){ glUseProgram(_shader_scene_water.id); }
 435 static void shader_scene_water_link(void){
 436    _uniform_scene_water_uMdl = glGetUniformLocation( _shader_scene_water.id, "uMdl" );
 437    _uniform_scene_water_uPv = glGetUniformLocation( _shader_scene_water.id, "uPv" );
 438    _uniform_scene_water_uPvmPrev = glGetUniformLocation( _shader_scene_water.id, "uPvmPrev" );
 439    _uniform_scene_water_uLightsArray = glGetUniformLocation( _shader_scene_water.id, "uLightsArray" );
 440    _uniform_scene_water_uTexMain = glGetUniformLocation( _shader_scene_water.id, "uTexMain" );
 441    _uniform_scene_water_uTexDudv = glGetUniformLocation( _shader_scene_water.id, "uTexDudv" );
 442    _uniform_scene_water_uTexBack = glGetUniformLocation( _shader_scene_water.id, "uTexBack" );
 443    _uniform_scene_water_uInvRes = glGetUniformLocation( _shader_scene_water.id, "uInvRes" );
 444    _uniform_scene_water_uTime = glGetUniformLocation( _shader_scene_water.id, "uTime" );
 445    _uniform_scene_water_uCamera = glGetUniformLocation( _shader_scene_water.id, "uCamera" );
 446    _uniform_scene_water_uSurfaceY = glGetUniformLocation( _shader_scene_water.id, "uSurfaceY" );
 447    _uniform_scene_water_uBoard0 = glGetUniformLocation( _shader_scene_water.id, "uBoard0" );
 448    _uniform_scene_water_uBoard1 = glGetUniformLocation( _shader_scene_water.id, "uBoard1" );
 449    _uniform_scene_water_uShoreColour = glGetUniformLocation( _shader_scene_water.id, "uShoreColour" );
 450    _uniform_scene_water_uOceanColour = glGetUniformLocation( _shader_scene_water.id, "uOceanColour" );
 451    _uniform_scene_water_g_world_depth = glGetUniformLocation( _shader_scene_water.id, "g_world_depth" );
 452 }
 453 #endif /* SHADER_scene_water_H */