shaders/scene_terrain.h

   1 #ifndef SHADER_scene_terrain_H
   2 #define SHADER_scene_terrain_H
   3 static void shader_scene_terrain_link(void);
   4 static void shader_scene_terrain_register(void);
   5 static struct vg_shader _shader_scene_terrain = {
   6    .name = "scene_terrain",
   7    .link = shader_scene_terrain_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 uTexGarbage;\n"
  67 "uniform sampler2D uTexGradients;\n"
  68 "uniform vec3 uCamera;\n"
  69 "uniform vec3 uSandColour;\n"
  70 "uniform vec2 uBlendOffset;\n"
  71 "uniform vec3 uBoard0;\n"
  72 "uniform vec3 uBoard1;\n"
  73 "\n"
  74 "in vec2 aUv;\n"
  75 "in vec4 aNorm;\n"
  76 "in vec3 aCo;\n"
  77 "in vec3 aWorldCo;\n"
  78 "flat in ivec4 aLights;\n"
  79 "\n"
  80 "#line       1        1 \n"
  81 "// :D\n"
  82 "\n"
  83 "#line       1        1 \n"
  84 "layout (location = 0) out vec4 oColour;\n"
  85 "\n"
  86 "layout (std140) uniform ub_world_lighting\n"
  87 "{\n"
  88 "   vec4 g_light_colours[3];\n"
  89 "   vec4 g_light_directions[3];\n"
  90 "   vec4 g_ambient_colour;\n"
  91 "\n"
  92 "   vec4 g_water_plane;\n"
  93 "   vec4 g_depth_bounds;\n"
  94 "   float g_water_fog;\n"
  95 "   int g_light_count;\n"
  96 "   int g_light_preview;\n"
  97 "   int g_shadow_samples;\n"
  98 "\n"
  99 "   vec4 g_point_light_positions[32];\n"
 100 "   vec4 g_point_light_colours[32];\n"
 101 "};\n"
 102 "\n"
 103 "uniform sampler2D g_world_depth;\n"
 104 "\n"
 105 "float world_depth_sample( vec3 pos )\n"
 106 "{\n"
 107 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 108 "   return texture( g_world_depth, depth_coord ).r;\n"
 109 "}\n"
 110 "\n"
 111 "float world_water_depth( vec3 pos )\n"
 112 "{\n"
 113 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 114 "   float ref_depth = g_water_plane.y*g_water_plane.w;\n"
 115 "   return texture( g_world_depth, depth_coord ).g - ref_depth;\n"
 116 "}\n"
 117 "\n"
 118 "float shadow_sample( vec3 vdir )\n"
 119 "{\n"
 120 "   vec3 sample_pos = aWorldCo + vdir;\n"
 121 "   float height_sample = world_depth_sample( sample_pos );\n"
 122 "\n"
 123 "   float fdelta = height_sample - sample_pos.y;\n"
 124 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 125 "}\n"
 126 "\n"
 127 "float sdLine( vec3 p, vec3 a, vec3 b )\n"
 128 "{\n"
 129 "  vec3 pa = p - a;\n"
 130 "  vec3 ba = b - a;\n"
 131 "\n"
 132 "  float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );\n"
 133 "  return length( pa - ba*h );\n"
 134 "}\n"
 135 "\n"
 136 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 137 "{\n"
 138 "   float dist = pow(fdist*0.0008,1.2);\n"
 139 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 140 "}\n"
 141 "\n"
 142 "\n"
 143 "// New lighting model\n"
 144 "\n"
 145 "vec3 newlight_compute_ambient()\n"
 146 "{\n"
 147 "   return g_ambient_colour.rgb;\n"
 148 "}\n"
 149 "\n"
 150 "float newlight_compute_sun_shadow()\n"
 151 "{\n"
 152 "   if( g_shadow_samples == 0 )\n"
 153 "   {\n"
 154 "      return 1.0;\n"
 155 "   }\n"
 156 "\n"
 157 "   float fspread = g_light_colours[0].w;\n"
 158 "   vec3  vdir = g_light_directions[0].xyz;\n"
 159 "   float flength = g_light_directions[0].w;\n"
 160 "\n"
 161 "   float famt = 0.0;\n"
 162 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 163 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 164 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 165 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 166 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 167 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 168 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 169 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 170 "\n"
 171 "   // player shadow\n"
 172 "   float dist_to_player = max( 0.0, sdLine( aWorldCo, uBoard0, uBoard1 )-0.1 );\n"
 173 "   float player_shadow = max( 1.0-dist_to_player*2.7, 0.0 );\n"
 174 "   player_shadow *= player_shadow*player_shadow*player_shadow;\n"
 175 "\n"
 176 "   return 1.0 - max( player_shadow*0.8, famt );\n"
 177 "}\n"
 178 "\n"
 179 "vec3 newlight_compute_world_diffuse( vec3 wnormal )\n"
 180 "{\n"
 181 "   vec3 vtotal = g_ambient_colour.rgb;\n"
 182 "\n"
 183 "   for( int i=0; i<g_light_count; i++ )\n"
 184 "   {\n"
 185 "      vec3 vcolour = g_light_colours[i].rgb;\n"
 186 "      vec3 vdir = g_light_directions[i].xyz;\n"
 187 "\n"
 188 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
 189 "      vtotal += vcolour*flight;\n"
 190 "   }\n"
 191 "\n"
 192 "   return vtotal;\n"
 193 "}\n"
 194 "\n"
 195 "vec3 newlight_compute_sun_spec( vec3 wnormal, vec3 halfview, float fintensity )\n"
 196 "{\n"
 197 "   vec3 vcolour = g_light_colours[0].rgb;\n"
 198 "   vec3 vdir = g_light_directions[0].xyz;\n"
 199 "\n"
 200 "   vec3 specdir = reflect( -vdir, wnormal );\n"
 201 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
 202 "   return vcolour*spec*fintensity;\n"
 203 "}\n"
 204 "\n"
 205 "vec3 newlight_compute_quadratic( vec3 wnormal, vec3 halfview, \n"
 206 "                                 vec3 light_pos, vec3 light_colour )\n"
 207 "{\n"
 208 "   vec3 light_delta = (light_pos-aWorldCo) * 10.0;\n"
 209 "\n"
 210 "   float quadratic = dot(light_delta,light_delta);\n"
 211 "   float attenuation = 1.0f/( 1.0f + quadratic );\n"
 212 "   attenuation *= max( 0.0, dot( normalize(light_delta), wnormal ) );\n"
 213 "\n"
 214 "   return light_colour*attenuation;\n"
 215 "}\n"
 216 "\n"
 217 "#line      4        0 \n"
 218 "\n"
 219 "vec3 scene_do_lighting( vec3 diffuse, vec3 wnormal )\n"
 220 "{\n"
 221 "   // Lighting\n"
 222 "   vec3 halfview = uCamera - aWorldCo;\n"
 223 "   float fdist = length(halfview);\n"
 224 "   halfview /= fdist;\n"
 225 "\n"
 226 "   vec3 total_light = newlight_compute_ambient();\n"
 227 "   \n"
 228 "   // Compute world lighting contribution and apply it according to the\n"
 229 "   // shadow map\n"
 230 "   //\n"
 231 "   vec3 world_light = newlight_compute_world_diffuse( wnormal );\n"
 232 "   world_light += newlight_compute_sun_spec( wnormal, halfview, 0.1 );\n"
 233 "\n"
 234 "   float world_shadow = newlight_compute_sun_shadow();\n"
 235 "\n"
 236 "   total_light += world_light * world_shadow;\n"
 237 "\n"
 238 "   // Compute the other lights that exist in the map, not effected by the sun\n"
 239 "   // shadow\n"
 240 "   total_light += newlight_compute_quadratic\n"
 241 "                  ( \n"
 242 "                     wnormal, halfview,\n"
 243 "                     g_point_light_positions[ aLights.x ].xyz,\n"
 244 "                     g_point_light_colours[ aLights.x ].rgb \n"
 245 "                  );\n"
 246 "   total_light += newlight_compute_quadratic\n"
 247 "                  ( \n"
 248 "                     wnormal, halfview,\n"
 249 "                     g_point_light_positions[ aLights.y ].xyz,\n"
 250 "                     g_point_light_colours[ aLights.y ].rgb \n"
 251 "                  );\n"
 252 "   total_light += newlight_compute_quadratic\n"
 253 "                  ( \n"
 254 "                     wnormal, halfview,\n"
 255 "                     g_point_light_positions[ aLights.z ].xyz,\n"
 256 "                     g_point_light_colours[ aLights.z ].rgb \n"
 257 "                  );\n"
 258 "\n"
 259 "   return apply_fog( diffuse * total_light, fdist );\n"
 260 "}\n"
 261 "\n"
 262 "#line     16        0 \n"
 263 "#line       1        2 \n"
 264 "const float k_motion_lerp_amount = 0.01;\n"
 265 "\n"
 266 "#line      2        0 \n"
 267 "\n"
 268 "layout (location = 1) out vec2 oMotionVec;\n"
 269 "\n"
 270 "in vec3 aMotionVec0;\n"
 271 "in vec3 aMotionVec1;\n"
 272 "\n"
 273 "void compute_motion_vectors()\n"
 274 "{\n"
 275 "   // Write motion vectors\n"
 276 "   vec2 vmotion0 = aMotionVec0.xy / aMotionVec0.z;\n"
 277 "   vec2 vmotion1 = aMotionVec1.xy / aMotionVec1.z;\n"
 278 "\n"
 279 "   oMotionVec = (vmotion1-vmotion0) * (1.0/k_motion_lerp_amount);\n"
 280 "}\n"
 281 "\n"
 282 "#line     17        0 \n"
 283 "\n"
 284 "void main()\n"
 285 "{\n"
 286 "   compute_motion_vectors();\n"
 287 "\n"
 288 "   // Colour\n"
 289 "   // ------\n"
 290 "   vec3 vfrag = vec3(0.5,0.5,0.5);\n"
 291 "\n"
 292 "   // ws modulation\n"
 293 "   vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );\n"
 294 "   \n"
 295 "   // Creating normal patches\n"
 296 "   vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;\n"
 297 "   vec3 qnorm = normalize(floor(aNorm.xyz*4.0+modnorm)*0.25);\n"
 298 "   qnorm += vec3(0.001,0.0,0.0);\n"
 299 "\n"
 300 "   vec2 dir = normalize(qnorm.xz);\n"
 301 "   vec2 uvdiffuse = aCo.xz * 0.02;\n"
 302 "   uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;\n"
 303 "   \n"
 304 "   // Patch local noise\n"
 305 "   vec4 rgarbage = texture( uTexGarbage, uvdiffuse );\n"
 306 "\n"
 307 "   // Colour blending\n"
 308 "   float amtgrass = step(qnorm.y,0.6);\n"
 309 "   float amtsand = min(max((aCo.y - 10.0) * -0.1,0.0)*qnorm.y,1.0);\n"
 310 "   vec2 uvgradients = aUv + vec2( amtgrass + rgarbage.a*0.8 )*uBlendOffset;\n"
 311 "   vfrag = texture( uTexGradients, uvgradients ).rgb;\n"
 312 "   vfrag = mix( vfrag, uSandColour, amtsand );\n"
 313 "\n"
 314 "   qnorm = mix( qnorm, aNorm.xyz, amtsand );\n"
 315 "   \n"
 316 "   if( g_light_preview == 1 )\n"
 317 "   {\n"
 318 "      vfrag = vec3(0.5);\n"
 319 "   }\n"
 320 "\n"
 321 "   vfrag = scene_do_lighting( vfrag, qnorm );\n"
 322 "   oColour = vec4(vfrag, 1.0);\n"
 323 "}\n"
 324 ""},
 325 };
 326
 327 static GLuint _uniform_scene_terrain_uMdl;
 328 static GLuint _uniform_scene_terrain_uPv;
 329 static GLuint _uniform_scene_terrain_uPvmPrev;
 330 static GLuint _uniform_scene_terrain_uTexGarbage;
 331 static GLuint _uniform_scene_terrain_uTexGradients;
 332 static GLuint _uniform_scene_terrain_uCamera;
 333 static GLuint _uniform_scene_terrain_uSandColour;
 334 static GLuint _uniform_scene_terrain_uBlendOffset;
 335 static GLuint _uniform_scene_terrain_uBoard0;
 336 static GLuint _uniform_scene_terrain_uBoard1;
 337 static GLuint _uniform_scene_terrain_g_world_depth;
 338 static void shader_scene_terrain_uMdl(m4x3f m){
 339    glUniformMatrix4x3fv(_uniform_scene_terrain_uMdl,1,GL_FALSE,(float*)m);
 340 }
 341 static void shader_scene_terrain_uPv(m4x4f m){
 342    glUniformMatrix4fv(_uniform_scene_terrain_uPv,1,GL_FALSE,(float*)m);
 343 }
 344 static void shader_scene_terrain_uPvmPrev(m4x4f m){
 345    glUniformMatrix4fv(_uniform_scene_terrain_uPvmPrev,1,GL_FALSE,(float*)m);
 346 }
 347 static void shader_scene_terrain_uTexGarbage(int i){
 348    glUniform1i(_uniform_scene_terrain_uTexGarbage,i);
 349 }
 350 static void shader_scene_terrain_uTexGradients(int i){
 351    glUniform1i(_uniform_scene_terrain_uTexGradients,i);
 352 }
 353 static void shader_scene_terrain_uCamera(v3f v){
 354    glUniform3fv(_uniform_scene_terrain_uCamera,1,v);
 355 }
 356 static void shader_scene_terrain_uSandColour(v3f v){
 357    glUniform3fv(_uniform_scene_terrain_uSandColour,1,v);
 358 }
 359 static void shader_scene_terrain_uBlendOffset(v2f v){
 360    glUniform2fv(_uniform_scene_terrain_uBlendOffset,1,v);
 361 }
 362 static void shader_scene_terrain_uBoard0(v3f v){
 363    glUniform3fv(_uniform_scene_terrain_uBoard0,1,v);
 364 }
 365 static void shader_scene_terrain_uBoard1(v3f v){
 366    glUniform3fv(_uniform_scene_terrain_uBoard1,1,v);
 367 }
 368 static void shader_scene_terrain_g_world_depth(int i){
 369    glUniform1i(_uniform_scene_terrain_g_world_depth,i);
 370 }
 371 static void shader_scene_terrain_register(void){
 372    vg_shader_register( &_shader_scene_terrain );
 373 }
 374 static void shader_scene_terrain_use(void){ glUseProgram(_shader_scene_terrain.id); }
 375 static void shader_scene_terrain_link(void){
 376    _uniform_scene_terrain_uMdl = glGetUniformLocation( _shader_scene_terrain.id, "uMdl" );
 377    _uniform_scene_terrain_uPv = glGetUniformLocation( _shader_scene_terrain.id, "uPv" );
 378    _uniform_scene_terrain_uPvmPrev = glGetUniformLocation( _shader_scene_terrain.id, "uPvmPrev" );
 379    _uniform_scene_terrain_uTexGarbage = glGetUniformLocation( _shader_scene_terrain.id, "uTexGarbage" );
 380    _uniform_scene_terrain_uTexGradients = glGetUniformLocation( _shader_scene_terrain.id, "uTexGradients" );
 381    _uniform_scene_terrain_uCamera = glGetUniformLocation( _shader_scene_terrain.id, "uCamera" );
 382    _uniform_scene_terrain_uSandColour = glGetUniformLocation( _shader_scene_terrain.id, "uSandColour" );
 383    _uniform_scene_terrain_uBlendOffset = glGetUniformLocation( _shader_scene_terrain.id, "uBlendOffset" );
 384    _uniform_scene_terrain_uBoard0 = glGetUniformLocation( _shader_scene_terrain.id, "uBoard0" );
 385    _uniform_scene_terrain_uBoard1 = glGetUniformLocation( _shader_scene_terrain.id, "uBoard1" );
 386    _uniform_scene_terrain_g_world_depth = glGetUniformLocation( _shader_scene_terrain.id, "g_world_depth" );
 387 }
 388 #endif /* SHADER_scene_terrain_H */