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Quellcode

uniform sampler2D ColorMap;

vec4 convolve3x3(vec4 IN,
  float W00, float W01, float W02,
  float W10, float W11, float W12,
  float W20, float W21, float W22,
  float Sum,
  float step_w,
  float step_h)
{
  int i = 0;
  vec4 C = vec4(0.0);
  float kernel[9];
  vec2 offset[9];
   
   offset[0] = vec2(-step_w, -step_h);
   offset[1] = vec2(0.0, -step_h);
   offset[2] = vec2(step_w, -step_h);
   
   offset[3] = vec2(-step_w, 0.0);
   offset[4] = vec2(0.0, 0.0);
   offset[5] = vec2(step_w, 0.0);
   
   offset[6] = vec2(-step_w, step_h);
   offset[7] = vec2(0.0, step_h);
   offset[8] = vec2(step_w, step_h);
   
   kernel[0] = W00;     kernel[1] = W01;    kernel[2] = W02;
   kernel[3] = W10; kernel[4] = W11;    kernel[5] = W12;
   kernel[6] = W20;     kernel[7] = W21;    kernel[8] = W22;
   
   
   for( i=0; i < 9; i++){
    vec4 tmp = texture2D(ColorMap, IN.st + offset[i]);
    C += tmp * (kernel[i]/Sum);
   }

  return C;
}

//texture size
uniform float width;
uniform float height; 

void main(){

 gl_FragColor = convolve3x3(gl_TexCoord[0],
            1.0, 1.0, 2.0,
            1.0, 4.0, 3.0,
            2.0, 3.0, 3.0,
            16.0,
            1.0/width,
            1.0/height);

}