shaderlib/ambientocclusion_combine.glsl

   1 import postprocess;
   2 import ambientocclusion;
   3
   4 #pragma MSP stage(fragment)
   5 void main()
   6 {
   7         vec3 center = unproject(vec3(vertex.xy, texture(depth, texcoord).r));
   8         float min_depth = project(vec3(center.xy, center.z+occlusion_radius*0.1)).z;
   9         float max_depth = project(vec3(center.xy, center.z-occlusion_radius*0.1)).z;
  10         vec2 tex_scale = 1.0/vec2(textureSize(occlusion, 0));
  11         float sum = 0.0;
  12         float count = 0.0;
  13         for(int i=0; i<4; ++i)
  14                 for(int j=0; j<4; ++j)
  15                 {
  16                         vec2 offset = vec2(float(i)-1.5, float(j)-1.5)*tex_scale;
  17                         float occ = texture(occlusion, texcoord+offset).r;
  18                         float sample = texture(depth, texcoord+offset).r;
  19                         if(sample>=min_depth && sample<=max_depth)
  20                         {
  21                                 sum += occ;
  22                                 count += 1.0;
  23                         }
  24                 }
  25         vec4 src_color = texture(source, texcoord);
  26         frag_color = vec4(src_color.rgb*mix(1.0, min(sum*2.0/count, 1.0), darkness), src_color.a);
  27 }