source: GTP/trunk/App/Demos/Illum/IBRBillboardCloudTrees/OGRE/IBRTreesOGRE/media/general/indirectTexturingDefault_FP20.cg @ 1493

void main_fp(float2 texCoord: TEXCOORD0, 
             float2 subTexCoord: TEXCOORD1,
             uniform sampler2D indirectTexture,
             uniform sampler2D sourceTexture,
             uniform float epsilonX,
             uniform float epsilonY,
             uniform float sourceTextureSize,
             uniform float numSamples,
             uniform float sqrtNumSamples,
             out float4 ocolor: COLOR)
{
   ocolor = float4(0.0, 0.0, 0.0, 0.0);
   float2 epsilon = float2(epsilonX, epsilonY);
   float4 value = tex2D(indirectTexture, subTexCoord).xyzw;
   float2 coords = float2(0.0, 1.0) - abs(texCoord - ( value.xy - epsilon ) );

   if (value.z != 0.0) 
   {    
        float2 newcoord = (float2(1.0, 1.0) - value.zw) + ((coords * sourceTextureSize) / sqrtNumSamples);
        ocolor = float4(tex2D(sourceTexture, newcoord).xyzw);
   }
}