builtin_data/_envmap_specular.glsl

   1 import cubemap_effect;
   2 import _pbr_prefilter;
   3
   4 #pragma MSP stage(fragment)
   5 layout(location=0) out vec3 frag_color;
   6 void main()
   7 {
   8         vec3 normal = normalize(texcoord);
   9         vec3 tangent = normalize(abs(normal.x)>abs(normal.y) ? vec3(-normal.z, 0.0, normal.x) : vec3(0.0, -normal.z, normal.y));
  10         mat3 orientation = mat3(tangent, cross(normal, tangent), normal);
  11
  12         vec3 sum = vec3(0.0);
  13         float weight = 0.0;
  14         for(int i=0; i<n_samples; ++i)
  15         {
  16                 vec3 halfway = orientation*ndist_ggxtr_importance_sample(hammersley(i, n_samples), roughness);
  17                 vec3 light_dir = reflect(-normal, halfway);
  18
  19                 float n_dot_light = dot(normal, light_dir);
  20
  21                 if(n_dot_light>0)
  22                 {
  23                         sum += textureLod(environment_map, light_dir, 0).rgb*n_dot_light;
  24                         weight += n_dot_light;
  25                 }
  26         }
  27
  28         frag_color = sum/weight;
  29 }