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 "\n"
  40 "out vec2 aUv;\n"
  41 "out vec4 aNorm;\n"
  42 "out vec3 aCo;\n"
  43 "out vec3 aWorldCo;\n"
  44 "flat out ivec4 aLights;\n"
  45 "\n"
  46 "void main()\n"
  47 "{\n"
  48 "   vec3 world_pos0 = uMdl     * vec4( a_co, 1.0 );\n"
  49 "   vec4 vproj0     = uPv      * vec4( world_pos0, 1.0 );\n"
  50 "   vec4 vproj1     = uPvmPrev * vec4( a_co, 1.0 );\n"
  51 "\n"
  52 "   vs_motion_out( vproj0, vproj1 );\n"
  53 "\n"
  54 "   gl_Position = vproj0;\n"
  55 "\n"
  56 "   aUv = a_uv;\n"
  57 "   aNorm = vec4( mat3(uMdl) * a_norm.xyz, a_norm.w );\n"
  58 "   aCo = a_co;\n"
  59 "   aWorldCo = world_pos0;\n"
  60 "   aLights = a_lights;\n"
  61 "}\n"
  62 ""},
  63    .fs =
  64 {
  65 .static_src =
  66 "uniform sampler2D uTexMain;\n"
  67 "uniform sampler2D uTexDudv;\n"
  68 "uniform sampler2D uTexBack;\n"
  69 "\n"
  70 "uniform vec2 uInvRes;\n"
  71 "uniform float uTime;\n"
  72 "uniform vec3 uCamera;\n"
  73 "uniform float uSurfaceY;\n"
  74 "uniform vec3 uBoard0;\n"
  75 "uniform vec3 uBoard1;\n"
  76 "\n"
  77 "uniform vec3 uShoreColour;\n"
  78 "uniform vec3 uOceanColour;\n"
  79 "\n"
  80 "in vec2 aUv;\n"
  81 "in vec4 aNorm;\n"
  82 "in vec3 aCo;\n"
  83 "in vec3 aWorldCo;\n"
  84 "flat in ivec4 aLights;\n"
  85 "\n"
  86 "#line       1        1 \n"
  87 "// :D\n"
  88 "\n"
  89 "#line       1        1 \n"
  90 "layout (location = 0) out vec4 oColour;\n"
  91 "\n"
  92 "layout (std140) uniform ub_world_lighting\n"
  93 "{\n"
  94 "   vec4 g_light_colours[3];\n"
  95 "   vec4 g_light_directions[3];\n"
  96 "   vec4 g_ambient_colour;\n"
  97 "\n"
  98 "   vec4 g_water_plane;\n"
  99 "   vec4 g_depth_bounds;\n"
 100 "   float g_water_fog;\n"
 101 "   int g_light_count;\n"
 102 "   int g_light_preview;\n"
 103 "   int g_shadow_samples;\n"
 104 "\n"
 105 "   vec4 g_point_light_positions[32];\n"
 106 "   vec4 g_point_light_colours[32];\n"
 107 "};\n"
 108 "\n"
 109 "uniform sampler2D g_world_depth;\n"
 110 "\n"
 111 "float world_depth_sample( vec3 pos )\n"
 112 "{\n"
 113 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 114 "   return texture( g_world_depth, depth_coord ).r;\n"
 115 "}\n"
 116 "\n"
 117 "float world_water_depth( vec3 pos )\n"
 118 "{\n"
 119 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 120 "   float ref_depth = g_water_plane.y*g_water_plane.w;\n"
 121 "   return texture( g_world_depth, depth_coord ).g - ref_depth;\n"
 122 "}\n"
 123 "\n"
 124 "float shadow_sample( vec3 vdir )\n"
 125 "{\n"
 126 "   vec3 sample_pos = aWorldCo + vdir;\n"
 127 "   float height_sample = world_depth_sample( sample_pos );\n"
 128 "\n"
 129 "   float fdelta = height_sample - sample_pos.y;\n"
 130 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 131 "}\n"
 132 "\n"
 133 "float sdLine( vec3 p, vec3 a, vec3 b )\n"
 134 "{\n"
 135 "  vec3 pa = p - a;\n"
 136 "  vec3 ba = b - a;\n"
 137 "\n"
 138 "  float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );\n"
 139 "  return length( pa - ba*h );\n"
 140 "}\n"
 141 "\n"
 142 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 143 "{\n"
 144 "   float dist = pow(fdist*0.0008,1.2);\n"
 145 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 146 "}\n"
 147 "\n"
 148 "\n"
 149 "// New lighting model\n"
 150 "\n"
 151 "vec3 newlight_compute_ambient()\n"
 152 "{\n"
 153 "   return g_ambient_colour.rgb;\n"
 154 "}\n"
 155 "\n"
 156 "float newlight_compute_sun_shadow()\n"
 157 "{\n"
 158 "   if( g_shadow_samples == 0 )\n"
 159 "   {\n"
 160 "      return 1.0;\n"
 161 "   }\n"
 162 "\n"
 163 "   float fspread = g_light_colours[0].w;\n"
 164 "   vec3  vdir = g_light_directions[0].xyz;\n"
 165 "   float flength = g_light_directions[0].w;\n"
 166 "\n"
 167 "   float famt = 0.0;\n"
 168 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 169 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 170 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 171 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 172 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 173 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 174 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 175 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 176 "\n"
 177 "   // player shadow\n"
 178 "   float dist_to_player = max( 0.0, sdLine( aWorldCo, uBoard0, uBoard1 )-0.1 );\n"
 179 "   float player_shadow = max( 1.0-dist_to_player*2.7, 0.0 );\n"
 180 "   player_shadow *= player_shadow*player_shadow*player_shadow;\n"
 181 "\n"
 182 "   return 1.0 - max( player_shadow*0.8, famt );\n"
 183 "}\n"
 184 "\n"
 185 "vec3 newlight_compute_world_diffuse( vec3 wnormal )\n"
 186 "{\n"
 187 "   vec3 vtotal = g_ambient_colour.rgb;\n"
 188 "\n"
 189 "   for( int i=0; i<g_light_count; i++ )\n"
 190 "   {\n"
 191 "      vec3 vcolour = g_light_colours[i].rgb;\n"
 192 "      vec3 vdir = g_light_directions[i].xyz;\n"
 193 "\n"
 194 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
 195 "      vtotal += vcolour*flight;\n"
 196 "   }\n"
 197 "\n"
 198 "   return vtotal;\n"
 199 "}\n"
 200 "\n"
 201 "vec3 newlight_compute_sun_spec( vec3 wnormal, vec3 halfview, float fintensity )\n"
 202 "{\n"
 203 "   vec3 vcolour = g_light_colours[0].rgb;\n"
 204 "   vec3 vdir = g_light_directions[0].xyz;\n"
 205 "\n"
 206 "   vec3 specdir = reflect( -vdir, wnormal );\n"
 207 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
 208 "   return vcolour*spec*fintensity;\n"
 209 "}\n"
 210 "\n"
 211 "vec3 newlight_compute_quadratic( vec3 wnormal, vec3 halfview, \n"
 212 "                                 vec3 light_pos, vec3 light_colour )\n"
 213 "{\n"
 214 "   vec3 light_delta = (light_pos-aWorldCo) * 10.0;\n"
 215 "\n"
 216 "   float quadratic = dot(light_delta,light_delta);\n"
 217 "   float attenuation = 1.0f/( 1.0f + quadratic );\n"
 218 "   attenuation *= max( 0.0, dot( normalize(light_delta), wnormal ) );\n"
 219 "\n"
 220 "   return light_colour*attenuation;\n"
 221 "}\n"
 222 "\n"
 223 "#line      4        0 \n"
 224 "\n"
 225 "vec3 scene_do_lighting( vec3 diffuse, vec3 wnormal )\n"
 226 "{\n"
 227 "   // Lighting\n"
 228 "   vec3 halfview = uCamera - aWorldCo;\n"
 229 "   float fdist = length(halfview);\n"
 230 "   halfview /= fdist;\n"
 231 "\n"
 232 "   vec3 total_light = newlight_compute_ambient();\n"
 233 "   \n"
 234 "   // Compute world lighting contribution and apply it according to the\n"
 235 "   // shadow map\n"
 236 "   //\n"
 237 "   vec3 world_light = newlight_compute_world_diffuse( wnormal );\n"
 238 "   world_light += newlight_compute_sun_spec( wnormal, halfview, 0.1 );\n"
 239 "\n"
 240 "   float world_shadow = newlight_compute_sun_shadow();\n"
 241 "\n"
 242 "   total_light += world_light * world_shadow;\n"
 243 "\n"
 244 "   // Compute the other lights that exist in the map, not effected by the sun\n"
 245 "   // shadow\n"
 246 "   total_light += newlight_compute_quadratic\n"
 247 "                  ( \n"
 248 "                     wnormal, halfview,\n"
 249 "                     g_point_light_positions[ aLights.x ].xyz,\n"
 250 "                     g_point_light_colours[ aLights.x ].rgb \n"
 251 "                  );\n"
 252 "   total_light += newlight_compute_quadratic\n"
 253 "                  ( \n"
 254 "                     wnormal, halfview,\n"
 255 "                     g_point_light_positions[ aLights.y ].xyz,\n"
 256 "                     g_point_light_colours[ aLights.y ].rgb \n"
 257 "                  );\n"
 258 "   total_light += newlight_compute_quadratic\n"
 259 "                  ( \n"
 260 "                     wnormal, halfview,\n"
 261 "                     g_point_light_positions[ aLights.z ].xyz,\n"
 262 "                     g_point_light_colours[ aLights.z ].rgb \n"
 263 "                  );\n"
 264 "\n"
 265 "   return apply_fog( diffuse * total_light, fdist );\n"
 266 "}\n"
 267 "\n"
 268 "#line     22        0 \n"
 269 "#line       1        2 \n"
 270 "const float k_motion_lerp_amount = 0.01;\n"
 271 "\n"
 272 "#line      2        0 \n"
 273 "\n"
 274 "layout (location = 1) out vec2 oMotionVec;\n"
 275 "\n"
 276 "in vec3 aMotionVec0;\n"
 277 "in vec3 aMotionVec1;\n"
 278 "\n"
 279 "void compute_motion_vectors()\n"
 280 "{\n"
 281 "   // Write motion vectors\n"
 282 "   vec2 vmotion0 = aMotionVec0.xy / aMotionVec0.z;\n"
 283 "   vec2 vmotion1 = aMotionVec1.xy / aMotionVec1.z;\n"
 284 "\n"
 285 "   oMotionVec = (vmotion1-vmotion0) * (1.0/k_motion_lerp_amount);\n"
 286 "}\n"
 287 "\n"
 288 "#line     23        0 \n"
 289 "\n"
 290 "vec4 water_surf( vec3 halfview, vec3 vnorm, float depthvalue, \n"
 291 "                 vec4 beneath, vec4 above )\n"
 292 "{\n"
 293 "   vec3 surface_tint = mix(uShoreColour, uOceanColour, depthvalue);\n"
 294 "\n"
 295 "   float ffresnel = pow(1.0-dot( vnorm, halfview ),5.0);\n"
 296 "\n"
 297 "   vec3 lightdir = vec3(0.95,0.0,-0.3);\n"
 298 "   vec3 specdir = reflect( -lightdir, vnorm );\n"
 299 "   float spec = pow(max(dot(halfview,specdir),0.0),20.0)*0.3;\n"
 300 "   \n"
 301 "   // Depth \n"
 302 "   float depthblend = pow( beneath.r, 0.8 );\n"
 303 "\n"
 304 "   // Composite\n"
 305 "   vec3 vsurface = mix(surface_tint, above.rgb, ffresnel );\n"
 306 "   //vsurface += spec;\n"
 307 "\n"
 308 "   return vec4( vsurface,depthblend );\n"
 309 "}\n"
 310 "\n"
 311 "void main()\n"
 312 "{\n"
 313 "   compute_motion_vectors();\n"
 314 "\n"
 315 "   // Create texture coords\n"
 316 "   vec2 ssuv = gl_FragCoord.xy*uInvRes;\n"
 317 "   \n"
 318 "   // Surface colour composite\n"
 319 "   float depthvalue = clamp( -world_water_depth( aCo )*(1.0/25.0), 0.0, 1.0 );\n"
 320 "\n"
 321 "   vec2 world_coord = aCo.xz * 0.008;\n"
 322 "   vec4 time_offsets = vec4( uTime ) * vec4( 0.008, 0.006, 0.003, 0.03 );\n"
 323 "   vec4 dudva = texture( uTexDudv, world_coord + time_offsets.xy )-0.5;\n"
 324 "   vec4 dudvb = texture( uTexDudv, world_coord *7.0 - time_offsets.zw )-0.5;\n"
 325 "\n"
 326 "   vec3 surfnorm = dudva.rgb + dudvb.rgb;\n"
 327 "   surfnorm = normalize(vec3(0.0,1.0,0.0) + dudva.xyz*0.4 + dudvb.xyz*0.1);\n"
 328 "   \n"
 329 "   // Foam\n"
 330 "   float fband = fract( aCo.z*0.02+uTime*0.1+depthvalue*10.0 );\n"
 331 "   fband = step( fband+dudva.a*0.8, 0.3 ) * max((1.0-depthvalue*4.0),0.0);\n"
 332 "\n"
 333 "   // Lighting\n"
 334 "   vec3 halfview = -normalize( aCo-uCamera );\n"
 335 "\n"
 336 "   // Sample textures\n"
 337 "   vec4 above = texture( uTexMain, ssuv+ surfnorm.xz*0.2 );\n"
 338 "   vec4 beneath = texture( uTexBack, ssuv );\n"
 339 "\n"
 340 "   // Fog\n"
 341 "   float fdist = pow(length( aCo.xz-uCamera.xz ) * 0.00047, 2.6);\n"
 342 "\n"
 343 "   // Composite\n"
 344 "   vec4 vsurface = water_surf( halfview, surfnorm, depthvalue, beneath, above );\n"
 345 "   vsurface.a -= fdist;\n"
 346 "   oColour = mix( vsurface, vec4(1.0,1.0,1.0,0.5), fband );\n"
 347 "}\n"
 348 ""},
 349 };
 350
 351 static GLuint _uniform_scene_water_uMdl;
 352 static GLuint _uniform_scene_water_uPv;
 353 static GLuint _uniform_scene_water_uPvmPrev;
 354 static GLuint _uniform_scene_water_uTexMain;
 355 static GLuint _uniform_scene_water_uTexDudv;
 356 static GLuint _uniform_scene_water_uTexBack;
 357 static GLuint _uniform_scene_water_uInvRes;
 358 static GLuint _uniform_scene_water_uTime;
 359 static GLuint _uniform_scene_water_uCamera;
 360 static GLuint _uniform_scene_water_uSurfaceY;
 361 static GLuint _uniform_scene_water_uBoard0;
 362 static GLuint _uniform_scene_water_uBoard1;
 363 static GLuint _uniform_scene_water_uShoreColour;
 364 static GLuint _uniform_scene_water_uOceanColour;
 365 static GLuint _uniform_scene_water_g_world_depth;
 366 static void shader_scene_water_uMdl(m4x3f m){
 367    glUniformMatrix4x3fv(_uniform_scene_water_uMdl,1,GL_FALSE,(float*)m);
 368 }
 369 static void shader_scene_water_uPv(m4x4f m){
 370    glUniformMatrix4fv(_uniform_scene_water_uPv,1,GL_FALSE,(float*)m);
 371 }
 372 static void shader_scene_water_uPvmPrev(m4x4f m){
 373    glUniformMatrix4fv(_uniform_scene_water_uPvmPrev,1,GL_FALSE,(float*)m);
 374 }
 375 static void shader_scene_water_uTexMain(int i){
 376    glUniform1i(_uniform_scene_water_uTexMain,i);
 377 }
 378 static void shader_scene_water_uTexDudv(int i){
 379    glUniform1i(_uniform_scene_water_uTexDudv,i);
 380 }
 381 static void shader_scene_water_uTexBack(int i){
 382    glUniform1i(_uniform_scene_water_uTexBack,i);
 383 }
 384 static void shader_scene_water_uInvRes(v2f v){
 385    glUniform2fv(_uniform_scene_water_uInvRes,1,v);
 386 }
 387 static void shader_scene_water_uTime(float f){
 388    glUniform1f(_uniform_scene_water_uTime,f);
 389 }
 390 static void shader_scene_water_uCamera(v3f v){
 391    glUniform3fv(_uniform_scene_water_uCamera,1,v);
 392 }
 393 static void shader_scene_water_uSurfaceY(float f){
 394    glUniform1f(_uniform_scene_water_uSurfaceY,f);
 395 }
 396 static void shader_scene_water_uBoard0(v3f v){
 397    glUniform3fv(_uniform_scene_water_uBoard0,1,v);
 398 }
 399 static void shader_scene_water_uBoard1(v3f v){
 400    glUniform3fv(_uniform_scene_water_uBoard1,1,v);
 401 }
 402 static void shader_scene_water_uShoreColour(v3f v){
 403    glUniform3fv(_uniform_scene_water_uShoreColour,1,v);
 404 }
 405 static void shader_scene_water_uOceanColour(v3f v){
 406    glUniform3fv(_uniform_scene_water_uOceanColour,1,v);
 407 }
 408 static void shader_scene_water_g_world_depth(int i){
 409    glUniform1i(_uniform_scene_water_g_world_depth,i);
 410 }
 411 static void shader_scene_water_register(void){
 412    vg_shader_register( &_shader_scene_water );
 413 }
 414 static void shader_scene_water_use(void){ glUseProgram(_shader_scene_water.id); }
 415 static void shader_scene_water_link(void){
 416    _uniform_scene_water_uMdl = glGetUniformLocation( _shader_scene_water.id, "uMdl" );
 417    _uniform_scene_water_uPv = glGetUniformLocation( _shader_scene_water.id, "uPv" );
 418    _uniform_scene_water_uPvmPrev = glGetUniformLocation( _shader_scene_water.id, "uPvmPrev" );
 419    _uniform_scene_water_uTexMain = glGetUniformLocation( _shader_scene_water.id, "uTexMain" );
 420    _uniform_scene_water_uTexDudv = glGetUniformLocation( _shader_scene_water.id, "uTexDudv" );
 421    _uniform_scene_water_uTexBack = glGetUniformLocation( _shader_scene_water.id, "uTexBack" );
 422    _uniform_scene_water_uInvRes = glGetUniformLocation( _shader_scene_water.id, "uInvRes" );
 423    _uniform_scene_water_uTime = glGetUniformLocation( _shader_scene_water.id, "uTime" );
 424    _uniform_scene_water_uCamera = glGetUniformLocation( _shader_scene_water.id, "uCamera" );
 425    _uniform_scene_water_uSurfaceY = glGetUniformLocation( _shader_scene_water.id, "uSurfaceY" );
 426    _uniform_scene_water_uBoard0 = glGetUniformLocation( _shader_scene_water.id, "uBoard0" );
 427    _uniform_scene_water_uBoard1 = glGetUniformLocation( _shader_scene_water.id, "uBoard1" );
 428    _uniform_scene_water_uShoreColour = glGetUniformLocation( _shader_scene_water.id, "uShoreColour" );
 429    _uniform_scene_water_uOceanColour = glGetUniformLocation( _shader_scene_water.id, "uOceanColour" );
 430    _uniform_scene_water_g_world_depth = glGetUniformLocation( _shader_scene_water.id, "g_world_depth" );
 431 }
 432 #endif /* SHADER_scene_water_H */