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 .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 "out vec4 FragColor;\n"
  76 "\n"
  77 "uniform vec3 uCamera;\n"
  78 "uniform vec3 uBoard0;\n"
  79 "uniform vec3 uBoard1;\n"
  80 "\n"
  81 "#line       1        1 \n"
  82 "// :D\n"
  83 "\n"
  84 "in vec2 aUv;\n"
  85 "in vec4 aNorm;\n"
  86 "in vec3 aCo;\n"
  87 "in vec3 aWorldCo;\n"
  88 "flat in vec4 light_colours[3];\n"
  89 "flat in vec4 light_positions[3];\n"
  90 "\n"
  91 "#line       1        1 \n"
  92 "layout (location = 0) out vec4 oColour;\n"
  93 "\n"
  94 "layout (std140) uniform ub_world_lighting\n"
  95 "{\n"
  96 "   vec4 g_light_colours[3];\n"
  97 "   vec4 g_light_directions[3];\n"
  98 "   vec4 g_ambient_colour;\n"
  99 "\n"
 100 "   vec4 g_water_plane;\n"
 101 "   vec4 g_depth_bounds;\n"
 102 "   float g_water_fog;\n"
 103 "   int g_light_count;\n"
 104 "   int g_light_preview;\n"
 105 "   int g_shadow_samples;\n"
 106 "\n"
 107 "   // g_time ?\n"
 108 "\n"
 109 "   //vec4 g_point_light_positions[32];\n"
 110 "   //vec4 g_point_light_colours[32];\n"
 111 "};\n"
 112 "\n"
 113 "uniform sampler2D g_world_depth;\n"
 114 "\n"
 115 "float world_depth_sample( vec3 pos )\n"
 116 "{\n"
 117 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 118 "   return texture( g_world_depth, depth_coord ).r;\n"
 119 "}\n"
 120 "\n"
 121 "float world_water_depth( vec3 pos )\n"
 122 "{\n"
 123 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 124 "   float ref_depth = g_water_plane.y*g_water_plane.w;\n"
 125 "   return texture( g_world_depth, depth_coord ).g - ref_depth;\n"
 126 "}\n"
 127 "\n"
 128 "float shadow_sample( vec3 vdir )\n"
 129 "{\n"
 130 "   vec3 sample_pos = aWorldCo + vdir;\n"
 131 "   float height_sample = world_depth_sample( sample_pos );\n"
 132 "\n"
 133 "   float fdelta = height_sample - sample_pos.y;\n"
 134 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 135 "}\n"
 136 "\n"
 137 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 138 "{\n"
 139 "   float dist = pow(fdist*0.0008,1.2);\n"
 140 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 141 "}\n"
 142 "\n"
 143 "\n"
 144 "// New lighting model\n"
 145 "\n"
 146 "vec3 newlight_compute_ambient()\n"
 147 "{\n"
 148 "   return g_ambient_colour.rgb;\n"
 149 "}\n"
 150 "\n"
 151 "float newlight_compute_sun_shadow()\n"
 152 "{\n"
 153 "   if( g_shadow_samples == 0 )\n"
 154 "   {\n"
 155 "      return 1.0;\n"
 156 "   }\n"
 157 "\n"
 158 "   float fspread = g_light_colours[0].w;\n"
 159 "   vec3  vdir = g_light_directions[0].xyz;\n"
 160 "   float flength = g_light_directions[0].w;\n"
 161 "\n"
 162 "   float famt = 0.0;\n"
 163 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 164 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 165 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 166 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 167 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 168 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 169 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 170 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 171 "\n"
 172 "   return 1.0 - famt;\n"
 173 "}\n"
 174 "\n"
 175 "vec3 newlight_compute_world_diffuse( vec3 wnormal )\n"
 176 "{\n"
 177 "   vec3 vtotal = g_ambient_colour.rgb;\n"
 178 "\n"
 179 "   for( int i=0; i<g_light_count; i++ )\n"
 180 "   {\n"
 181 "      vec3 vcolour = g_light_colours[i].rgb;\n"
 182 "      vec3 vdir = g_light_directions[i].xyz;\n"
 183 "\n"
 184 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
 185 "      vtotal += vcolour*flight;\n"
 186 "   }\n"
 187 "\n"
 188 "   return vtotal;\n"
 189 "}\n"
 190 "\n"
 191 "vec3 newlight_compute_sun_spec( vec3 wnormal, vec3 halfview, float fintensity )\n"
 192 "{\n"
 193 "   vec3 vcolour = g_light_colours[0].rgb;\n"
 194 "   vec3 vdir = g_light_directions[0].xyz;\n"
 195 "\n"
 196 "   vec3 specdir = reflect( -vdir, wnormal );\n"
 197 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
 198 "   return vcolour*spec*fintensity;\n"
 199 "}\n"
 200 "\n"
 201 "vec3 newlight_compute_quadratic( vec3 wnormal, vec3 halfview, \n"
 202 "                                 vec3 light_pos, vec3 light_colour )\n"
 203 "{\n"
 204 "   vec3 light_delta = (light_pos-aWorldCo) * 10.0;\n"
 205 "\n"
 206 "   float quadratic = dot(light_delta,light_delta);\n"
 207 "   float attenuation = 1.0f/( 1.0f + quadratic );\n"
 208 "   attenuation *= max( 0.0, dot( normalize(light_delta), wnormal ) );\n"
 209 "\n"
 210 "   return light_colour*attenuation;\n"
 211 "}\n"
 212 "\n"
 213 "#line     11        0 \n"
 214 "\n"
 215 "float sdLine( vec3 p, vec3 a, vec3 b )\n"
 216 "{\n"
 217 "  vec3 pa = p - a;\n"
 218 "  vec3 ba = b - a;\n"
 219 "\n"
 220 "  float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );\n"
 221 "  return length( pa - ba*h );\n"
 222 "}\n"
 223 "\n"
 224 "float compute_board_shadow()\n"
 225 "{\n"
 226 "   // player shadow\n"
 227 "   float dist_to_player = max( 0.0, sdLine( aWorldCo, uBoard0, uBoard1 )-0.1 );\n"
 228 "   float player_shadow = max( 1.0-dist_to_player*2.7, 0.0 );\n"
 229 "   player_shadow *= player_shadow*player_shadow*player_shadow;\n"
 230 "\n"
 231 "   return 1.0 - player_shadow*0.8;\n"
 232 "}\n"
 233 "\n"
 234 "vec3 scene_do_lighting( vec3 diffuse, vec3 wnormal )\n"
 235 "{\n"
 236 "   // Lighting\n"
 237 "   vec3 halfview = uCamera - aWorldCo;\n"
 238 "   float fdist = length(halfview);\n"
 239 "   halfview /= fdist;\n"
 240 "\n"
 241 "   vec3 total_light = newlight_compute_ambient();\n"
 242 "   \n"
 243 "   // Compute world lighting contribution and apply it according to the\n"
 244 "   // shadow map\n"
 245 "   //\n"
 246 "   vec3 world_light = newlight_compute_world_diffuse( wnormal );\n"
 247 "   world_light += newlight_compute_sun_spec( wnormal, halfview, 0.1 );\n"
 248 "\n"
 249 "   float world_shadow = newlight_compute_sun_shadow();\n"
 250 "   float board_shadow = compute_board_shadow();\n"
 251 "\n"
 252 "   total_light += world_light * min( board_shadow, world_shadow );\n"
 253 "\n"
 254 "   // Compute the other lights that exist in the map, not effected by the sun\n"
 255 "   // shadow\n"
 256 "\n"
 257 "   total_light += newlight_compute_quadratic\n"
 258 "                  ( \n"
 259 "                     wnormal, halfview,\n"
 260 "                     light_positions[0].xyz,\n"
 261 "                     light_colours[0].rgb \n"
 262 "                  ) * board_shadow;\n"
 263 "   total_light += newlight_compute_quadratic\n"
 264 "                  ( \n"
 265 "                     wnormal, halfview,\n"
 266 "                     light_positions[1].xyz,\n"
 267 "                     light_colours[1].rgb \n"
 268 "                  ) * board_shadow;\n"
 269 "   total_light += newlight_compute_quadratic\n"
 270 "                  ( \n"
 271 "                     wnormal, halfview,\n"
 272 "                     light_positions[2].xyz,\n"
 273 "                     light_colours[2].rgb \n"
 274 "                  ) * board_shadow;\n"
 275 "\n"
 276 "   return apply_fog( diffuse * total_light, fdist );\n"
 277 "}\n"
 278 "\n"
 279 "#line      8        0 \n"
 280 "\n"
 281 "void main()\n"
 282 "{\n"
 283 "   float height_full = aWorldCo.y;\n"
 284 "   float height_water = height_full;\n"
 285 "\n"
 286 "   if( height_water > (g_water_plane.y * g_water_plane.w) + 2.0 )\n"
 287 "      height_water = -99999.9;\n"
 288 "\n"
 289 "   FragColor = vec4( height_full, height_water, 0.0, 0.0 );\n"
 290 "}\n"
 291 ""},
 292 };
 293
 294 static GLuint _uniform_scene_position_uMdl;
 295 static GLuint _uniform_scene_position_uPv;
 296 static GLuint _uniform_scene_position_uPvmPrev;
 297 static GLuint _uniform_scene_position_uLightsArray;
 298 static GLuint _uniform_scene_position_uCamera;
 299 static GLuint _uniform_scene_position_uBoard0;
 300 static GLuint _uniform_scene_position_uBoard1;
 301 static GLuint _uniform_scene_position_g_world_depth;
 302 static void shader_scene_position_uMdl(m4x3f m){
 303    glUniformMatrix4x3fv(_uniform_scene_position_uMdl,1,GL_FALSE,(float*)m);
 304 }
 305 static void shader_scene_position_uPv(m4x4f m){
 306    glUniformMatrix4fv(_uniform_scene_position_uPv,1,GL_FALSE,(float*)m);
 307 }
 308 static void shader_scene_position_uPvmPrev(m4x4f m){
 309    glUniformMatrix4fv(_uniform_scene_position_uPvmPrev,1,GL_FALSE,(float*)m);
 310 }
 311 static void shader_scene_position_uCamera(v3f v){
 312    glUniform3fv(_uniform_scene_position_uCamera,1,v);
 313 }
 314 static void shader_scene_position_uBoard0(v3f v){
 315    glUniform3fv(_uniform_scene_position_uBoard0,1,v);
 316 }
 317 static void shader_scene_position_uBoard1(v3f v){
 318    glUniform3fv(_uniform_scene_position_uBoard1,1,v);
 319 }
 320 static void shader_scene_position_g_world_depth(int i){
 321    glUniform1i(_uniform_scene_position_g_world_depth,i);
 322 }
 323 static void shader_scene_position_register(void){
 324    vg_shader_register( &_shader_scene_position );
 325 }
 326 static void shader_scene_position_use(void){ glUseProgram(_shader_scene_position.id); }
 327 static void shader_scene_position_link(void){
 328    _uniform_scene_position_uMdl = glGetUniformLocation( _shader_scene_position.id, "uMdl" );
 329    _uniform_scene_position_uPv = glGetUniformLocation( _shader_scene_position.id, "uPv" );
 330    _uniform_scene_position_uPvmPrev = glGetUniformLocation( _shader_scene_position.id, "uPvmPrev" );
 331    _uniform_scene_position_uLightsArray = glGetUniformLocation( _shader_scene_position.id, "uLightsArray" );
 332    _uniform_scene_position_uCamera = glGetUniformLocation( _shader_scene_position.id, "uCamera" );
 333    _uniform_scene_position_uBoard0 = glGetUniformLocation( _shader_scene_position.id, "uBoard0" );
 334    _uniform_scene_position_uBoard1 = glGetUniformLocation( _shader_scene_position.id, "uBoard1" );
 335    _uniform_scene_position_g_world_depth = glGetUniformLocation( _shader_scene_position.id, "g_world_depth" );
 336 }
 337 #endif /* SHADER_scene_position_H */