shaderlib/colorcurve.glsl

   1 import postprocess;
   2
   3 uniform sampler1D curve;
   4 uniform ToneMapping
   5 {
   6         float peak;
   7         float brightness;
   8 };
   9
  10 ////// fragment
  11 void main()
  12 {
  13         vec4 sample = texture(source, texcoord);
  14         float maxc = max(sample.r, max(sample.g, sample.b));
  15         if(maxc>1.0-peak)
  16         {
  17                 vec3 saturated = sample.rgb/maxc;
  18                 if(maxc>1.0+peak)
  19                 {
  20                         sample.rgb = mix(vec3(1.0), saturated, 1.0/pow(brightness, maxc-1.0-peak));
  21                 }
  22                 else
  23                 {
  24                         float x = (1.0+peak-maxc)/(2.0*peak);
  25                         sample.rgb = saturated.rgb*(1.0-peak+(1.0-x*x)*peak);
  26                 }
  27         }
  28         frag_color = vec4(texture(curve, sample.r).r, texture(curve, sample.g).r, texture(curve, sample.b).r, sample.a);
  29 }