shaderlib/environment.glsl

   1 layout(set=0) uniform EnvMap
   2 {
   3         mat3 env_world_matrix;
   4 };
   5
   6 layout(set=0) uniform samplerCube environment_map;
   7 layout(set=0) uniform samplerCube irradiance_map;
   8
   9 #pragma MSP stage(fragment)
  10 virtual vec3 get_environment_sample(vec3 direction, float roughness)
  11 {
  12         float lod = (2-roughness)*roughness*(textureQueryLevels(environment_map)-1);
  13         return textureLod(environment_map, env_world_matrix*direction, lod).rgb;
  14 }
  15
  16 virtual vec3 get_reflection(vec3 normal, vec3 look)
  17 {
  18         vec3 reflect_dir = reflect(look, normal);
  19         return get_environment_sample(reflect_dir, 0.0);
  20 }
  21
  22 virtual vec3 get_irradiance_sample(vec3 normal)
  23 {
  24         return texture(irradiance_map, env_world_matrix*normal).rgb;
  25 }
  26