builtin_data/_ambientocclusion_occlude.glsl

   1 import flat_effect;
   2 import _ambientocclusion;
   3
   4 #pragma MSP stage(fragment)
   5 layout(location=0) out float frag_out;
   6 void main()
   7 {
   8         vec4 rv = texture(rotate, gl_FragCoord.xy/4.0)*2.0-1.0;
   9         mat3 transform = mat3(rv.xy, 0.0, rv.zx, 0.0, 0.0, 0.0, rv.w)*occlusion_radius;
  10         vec3 center = unproject(vec3(vertex.xy, texture(depth, texcoord).r));
  11         float min_depth = project(vec3(center.xy, center.z+occlusion_radius)).z;
  12         float occlusion_sum = 0.0;
  13         float count = 0.0;
  14         for(int i=0; i<n_samples; ++i)
  15         {
  16                 vec3 psp = project(center+transform*sample_points[i]);
  17                 float sample = texture(depth, psp.xy*0.5+0.5).r;
  18                 if(sample>=min_depth)
  19                 {
  20                         if(sample<psp.z)
  21                                 occlusion_sum += 1.0;
  22                         count += 1.0;
  23                 }
  24         }
  25         frag_out = 1.0-occlusion_sum/count;
  26 }