Multithreaded Paraboloid Mapping - Practical Rendering and Computation with Direct3D 11 - page 579

cbuffer ParaboloidTransforms
{

matrix WorldViewMatrix;

};
Texture2D ColorTexture : register( t0 );
SamplerState LinearSampler : register( s0 );

struct VS_INPUT
{

float3 position : POSITION;
float2 tex : TEXCOORDS0;

};

struct GS_INPUT
{

float4 position : SV_Position;
float2 tex : TEXCOORD0;
float z_value : ZVALUE;

};
struct PS_INPUT
{

ftoat4 position : SV_Position;
float2 tex : TEXCOORD0;
float z_value : ZVALUE;
uint rtindex : SV_RenderTargetArrayIndex;

};

GS_INPUT VSMAIN( VS_INPUT IN )
{

GS_INPUT OUT;

// Transform the vertex to be relative to the paraboloid's basis.
OUT.position = mul( float4( IN.position, 1 ), WorldViewMatrix );

// Determine the distance between the paraboloid origin and the vertex,
float L = length( OUT.position.xyz );

// Normalize the vector to the vertex
OUT.position = OUT.position / L;

// Save the z-component of the normalized vector
OUT.z_value = OUT.position.z;

// Store the distance to the vertex for use in the depth buffer.
OUT.position.z = L / 500;

// Set w to 1 since we aren't doing any perspective distortion.
OUT.position.w = 1;

// Pass through texture coordinates
OUT.tex = IN. tex;

return OUT;

}

Listing 13.1. The vertex shader for rendering a textured object into a paraboloid map.