source: GTP/trunk/App/Demos/Illum/Ogre/Media/materials/programs/GameTools_Blur.hlsl @ 1257

#define samplesU 5
#define samplesV 5

struct VS_INPUT {           
    float4 Position : POSITION;
};

struct VS_OUTPUT {         
    float4 hPosition : POSITION;
    float2 Position  : TEXCOORD0;
};

VS_OUTPUT BlurVS(VS_INPUT IN) {
        VS_OUTPUT OUT;
    OUT.hPosition = IN.Position;
    OUT.Position =(IN.Position.xy + 1.0) / 2.0;
    OUT.Position.y = 1.0 - OUT.Position.y;
    return OUT;
}

float4 BlurPS(VS_OUTPUT IN,
                        uniform sampler2D Texture : register(s0),
                        uniform float width,
                        uniform float height ) : COLOR
{  

  float2 pixel = float2(1.0 / width, 1.0 / height);
  float2 uv = IN.Position + pixel * 0.5;

  float4 sum = float4(0,0,0,0);

        for(int i = 0; i < samplesU; i++)
         for(int j = 0; j < samplesU; j++)
                sum += tex2D(Texture, uv + float2(i - samplesU * 0.5,j - samplesV * 0.5) * pixel);

  sum /= samplesU * samplesV;

  return sum;
  return tex2D(Texture, uv);
}