Deferred Rendering - Practical Rendering and Computation with Direct3D 11 - page 508

{

ftoat4 ScreenPos : SV_Position;
float2 TexCoord : TEXCOORD;

};

// Vertex shader for final pass of light prepass deferred rendering
VSOutput VSMain( in VSInput input )
{

VSOutput output;

// Calculate the clip-space position
output.PositionCS = mul( input.Position , WorldViewProjMatrix );

// Pass along the texture coordinate
output . TexCoord = input.TexCoord;

return output;

}

// Pixel shader for final pass of light prepass deferred rendering
float4 PSHain( in PSInput input ) : SV_Target0
{

// Sample the diffuse map
float3 diffuseAlbedo = DiffuseMap.Sample( AnisoSampler, input . TexCoord ).rgb;

// Determine our indices for sampling the texture based on the current
// screen position
int3 sampleIndices = int3( input.ScreenPos.xy, 0 );

// Sample the light target
float4 lighting = LightTexture. Load( samplelndices );

// Apply the diffuse and specular albedo to the lighting value
float3 diffuse = lighting.xyz * diffuseAlbedo;
float3 specular = lighting. w * SpecularAlbedo;

// Final output is the sum of diffuse + specular
return float4( diffuse + specular, 1.0f );

}

Listing 1 1 .6. Shader code for final pass.

It should be noted that other terms that contribute to the final pixel color can also be
added in, such as emissive lighting (glow), Fresnel/rim lighting, or reflection maps. This
makes light pre-pass deferred rendering more natural for implementing these sorts of mate-
rial variations.