Hi-Z Screen-Space Cone-Traced Reflections - GPU Pro: Advanced Rendering Techniques - page 177

// Horizontal blur shader entry point in
// psHorizontalGaussianBlur. hlsl
float4 main ( PS_INPUT input ): SV_Target
{ // Texture/image coordinates to sample/load the color values
// with .
float2 texcoords = input . tex ;
float4 color ;

// Sample the color values and weight by the pre − calculated

// normalized Gaussian weights horizontally .
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 ( − 3, 0 ) ) ￿ 0.001 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 ( − 2, 0 ) ) ￿ 0.028 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 ( − 1, 0 ) ) ￿ 0.233 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 (0, 0)) ￿ 0.474 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 (1, 0)) ￿ 0.233 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 (2, 0)) ￿ 0.028 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 (3,

0)) ￿ 0.001 f ;

return color ;

}

// Vertical blur shader entry point in
// psVerticalGaussianBlur . hlsl
float4 main ( PS_INPUT input ): SV_Target
{ // Texture/image coordinates to sample/load the color values
// with .
float2 texcoords = input . tex ;
float4 color ;

// Sample the color values and weight by the pre − calculated

// normalized Gaussian weights vertically .
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 (0, 3)) ￿ 0.001 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 (0, 2)) ￿ 0.028 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 (0, 1)) ￿ ￿ 0.233 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 (0, 0)) ￿ 0.474 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 (0, − 1)) ￿ 0.233 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 (0, − 2)) ￿ 0.028 f ;
color += colorBuffer . SampleLevel ( pointSampler , texcoords ,
prevLevel , int2 (0, − 3)) ￿ ￿ 0.001 f ;
return color ;

}

Listing 4.6. Simple horizontal and vertical separable blur shaders, with a 7 × 7kernel.