shaderlib/ambientocclusion_occlude.glsl

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