progs/glsl/convolution.frag

   1
   2 const int KernelSize = 9;
   3
   4 //texture offsets
   5 uniform vec2 Offset[KernelSize];
   6 //convolution kernel
   7 uniform vec4 KernelValue[KernelSize];
   8 uniform sampler2D srcTex;
   9 uniform vec4 ScaleFactor;
  10 uniform vec4 BaseColor;
  11
  12 void main(void)
  13 {
  14     int i;
  15     vec4 sum = vec4(0.0);
  16     for (i = 0; i < KernelSize; ++i) {
  17         vec4 tmp = texture2D(srcTex, gl_TexCoord[0].st + Offset[i]);
  18         sum += tmp * KernelValue[i];
  19     }
  20     gl_FragColor = sum * ScaleFactor + BaseColor;
  21 }