sampler indirectTexture: register(s0);

void main_fp(float2 texCoord: TEXCOORD0, 
             float2 subTexCoord: TEXCOORD1,
             out float4 ocolor: COLOR,
             uniform sampler2D indirectTexture)
{

   float2 coords = texCoord + (float2(1.0, 1.0) - tex2D(indirectTexture, subTexCoord).xy); 
   ocolor = float4(coords, 0.0, 1.0);
}