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// ReconstructCameraSpaceZ.fx
// Reconstructs camera space z from depth
#include "BasicStructures.fxh"
#include "AtmosphereShadersCommon.fxh"
Texture2D<float> g_tex2DDepthBuffer;
cbuffer cbCameraAttribs
{
CameraAttribs g_CameraAttribs;
}
float DepthToCameraZ(in float fDepth, in matrix mProj)
{
// Transformations to/from normalized device coordinates are the
// same in both APIs.
// However, in GL, depth must be transformed to NDC Z first
float z = DepthToNormalizedDeviceZ(fDepth);
return MATRIX_ELEMENT(mProj,3,2) / (z - MATRIX_ELEMENT(mProj,2,2));
}
void ReconstructCameraSpaceZPS(FullScreenTriangleVSOutput VSOut,
// IMPORTANT: non-system generated pixel shader input
// arguments must have the exact same name as vertex shader
// outputs and must go in the same order.
// Moreover, even if the shader is not using the argument,
// it still must be declared.
out float fCamSpaceZ : SV_Target)
{
float fDepth = g_tex2DDepthBuffer.Load( int3(VSOut.f4PixelPos.xy,0) );
fCamSpaceZ = DepthToCameraZ(fDepth, g_CameraAttribs.mProj);
}
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