client/shaders/extract_bloom/opengl_fragment.glsl

   1 #define rendered texture0
   2
   3 struct ExposureParams {
   4         float compensationFactor;
   5 };
   6
   7 uniform sampler2D rendered;
   8 uniform mediump float bloomStrength;
   9 uniform ExposureParams exposureParams;
  10
  11 #ifdef GL_ES
  12 varying mediump vec2 varTexCoord;
  13 #else
  14 centroid varying vec2 varTexCoord;
  15 #endif
  16
  17 #ifdef ENABLE_AUTO_EXPOSURE
  18 varying float exposure; // linear exposure factor, see vertex shader
  19 #endif
  20
  21 void main(void)
  22 {
  23         vec2 uv = varTexCoord.st;
  24         vec3 color = texture2D(rendered, uv).rgb;
  25         // translate to linear colorspace (approximate)
  26         color = pow(color, vec3(2.2));
  27
  28         color *= exposureParams.compensationFactor * bloomStrength;
  29
  30 #ifdef ENABLE_AUTO_EXPOSURE
  31         color *= exposure;
  32 #endif
  33
  34         gl_FragColor = vec4(color, 1.0); // force full alpha to avoid holes in the image.
  35 }