shaderlib/colorcurve.glsl

   1 import postprocess;
   2
   3 uniform sampler1D curve;
   4 uniform ToneMapping
   5 {
   6         float exposure;
   7         vec3 brightness_response;
   8 };
   9
  10 #pragma MSP stage(fragment)
  11 void main()
  12 {
  13         vec4 incoming = texture(source, texcoord);
  14         float maxc = max(incoming.r, max(incoming.g, incoming.b));
  15         if(maxc>0.0)
  16         {
  17                 vec3 saturated = incoming.rgb/maxc;
  18                 maxc = pow(maxc*exposure+brightness_response.y, brightness_response.x)-brightness_response.z;
  19                 float c = min(maxc, 1.0);
  20                 float minc = min(saturated.r, min(saturated.g, saturated.b));
  21                 incoming.rgb = mix(saturated, vec3(1.0), min((maxc-c)/(1.0-minc), 1.0))*c;
  22         }
  23         frag_color = vec4(texture(curve, incoming.r).r, texture(curve, incoming.g).r, texture(curve, incoming.b).r, incoming.a);
  24 }