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#include "FullScreenTriangleVSOutput.fxh"
#include "BasicStructures.fxh"
#include "Shadows.fxh"
struct ConversionAttribs
{
int iCascade;
float fHorzFilterRadius;
float fVertFilterRadius;
float fEVSMPositiveExponent;
float fEVSMNegativeExponent;
bool Is32BitEVSM;
};
cbuffer cbConversionAttribs
{
ConversionAttribs g_Attribs;
}
Texture2DArray g_tex2DShadowMap;
float GetSampleWeight(int x, float FilterRadius)
{
float fTexelMin = max(float(x), min(0.5 - FilterRadius, 0.0));
float fTexelMax = min(float(x) + 1.0, max(0.5 + FilterRadius, 1.0));
return fTexelMax - fTexelMin;
}
float4 VSMHorzPS(FullScreenTriangleVSOutput VSOut) : SV_Target
{
float2 f2Moments = float2(0.0, 0.0);
int range = int(floor(g_Attribs.fHorzFilterRadius + 0.5));
float fTotalWeight = 0.0;
for (int i = -range; i <= +range; ++i)
{
float fWeight = GetSampleWeight(i, g_Attribs.fHorzFilterRadius);
float fDepth = g_tex2DShadowMap.Load( int4( int(VSOut.f4PixelPos.x) + i, int(VSOut.f4PixelPos.y), g_Attribs.iCascade, 0) ).r;
f2Moments += float2(fDepth, fDepth*fDepth) * fWeight;
fTotalWeight += fWeight;
}
return float4(f2Moments / fTotalWeight, 0.0, 0.0);
}
float4 EVSMHorzPS(FullScreenTriangleVSOutput VSOut) : SV_Target
{
float2 f2Exponents = GetEVSMExponents(g_Attribs.fEVSMPositiveExponent, g_Attribs.fEVSMNegativeExponent, g_Attribs.Is32BitEVSM);
float4 f4Moments = float4(0.0, 0.0, 0.0, 0.0);
int range = int(floor(g_Attribs.fHorzFilterRadius + 0.5));
float fTotalWeight = 0.0;
for (int i = -range; i <= +range; ++i)
{
float fWeight = GetSampleWeight(i, g_Attribs.fHorzFilterRadius);
float fDepth = g_tex2DShadowMap.Load( int4( int(VSOut.f4PixelPos.x) + i, int(VSOut.f4PixelPos.y), g_Attribs.iCascade, 0) ).r;
float2 f2EVSMDepth = WarpDepthEVSM(fDepth, f2Exponents);
f4Moments += float4(f2EVSMDepth.x, f2EVSMDepth.x*f2EVSMDepth.x, f2EVSMDepth.y, f2EVSMDepth.y*f2EVSMDepth.y) * fWeight;
fTotalWeight += fWeight;
}
return f4Moments / fTotalWeight;
}
float4 VertBlurPS(FullScreenTriangleVSOutput VSOut) : SV_Target
{
float4 f4Moments = float4(0.0, 0.0, 0.0, 0.0);
int range = int(floor(g_Attribs.fVertFilterRadius + 0.5));
float fTotalWeight = 0.0;
for (int i = -range; i <= +range; ++i)
{
float fWeight = GetSampleWeight(i, g_Attribs.fVertFilterRadius);
f4Moments += g_tex2DShadowMap.Load( int4( int(VSOut.f4PixelPos.x), int(VSOut.f4PixelPos.y) + i, 0, 0) ) * fWeight;
fTotalWeight += fWeight;
}
return f4Moments / fTotalWeight;
}
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