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Factor out common SSS functionality using a macro

/RenderPassXR_Sandbox
Evgenii Golubev 8 年前
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b115911f
共有 1 个文件被更改，包括 60 次插入 和 77 次删除
  1. 137
      Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Resources/CombineSubsurfaceScattering.shader

137
Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Resources/CombineSubsurfaceScattering.shader
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return valX * rcpPdfX;
}
#define SSS_ITER(i, n, kernel, profileID, shapeParam, centerPosUnSS, centerDepthVS, millimPerUnit, scaledPixPerMm, rcpDistScale, totalIrradiance, totalWeight) \
{ \
/* Everything except for the radius is a compile-time constant. */ \
float r = kernel[profileID][i][0]; \
float phi = TWO_PI * Fibonacci2d(i, n).y; \
float2 vec = r * float2(cos(phi), sin(phi)); \
\
float2 position = centerPosUnSS + vec * scaledPixPerMm; \
float rcpPdf = kernel[profileID][i][1]; \
float depth = LOAD_TEXTURE2D(_MainDepthTexture, position).r; \
float3 irradiance = LOAD_TEXTURE2D(_IrradianceSource, position).rgb; \
\
[flatten] \
if (any(irradiance) == false) \
{ \
/*************************************************************************/ \
/* The irradiance is 0. This could happen for 3 reasons. */ \
/* Most likely, the surface fragment does not have an SSS material. */ \
/* Alternatively, our sample comes from a region without any geometry. */ \
/* Finally, the surface fragment could be completely shadowed. */ \
/* Our blur is energy-preserving, so 'centerWeight' should be set to 0. */ \
/* We do not terminate the loop since we want to gather the contribution */ \
/* of the remaining samples (e.g. in case of hair covering skin). */ \
/*************************************************************************/ \
continue; \
} \
\
/* Apply bilateral weighting. */ \
float d = LinearEyeDepth(depth, _ZBufferParams); \
float z = millimPerUnit * d - (millimPerUnit * centerDepthVS); \
float3 w = ComputeBilateralWeight(shapeParam, r, z, rcpDistScale, rcpPdf); \
\
totalIrradiance += w * irradiance; \
totalWeight += w; \
}
struct Attributes
{
uint vertexID : SV_VertexID;

float maxDistance = _ShapeParameters[profileID].a;
// Reconstruct the view-space position.
float2 cornerPosSS = posInput.positionSS + 0.5 * _ScreenSize.zw;
float rawDepth = LOAD_TEXTURE2D(_MainDepthTexture, posInput.unPositionSS).r;
float3 centerPosVS = ComputeViewSpacePosition(posInput.positionSS, rawDepth, _InvProjMatrix);
float3 cornerPosVS = ComputeViewSpacePosition(cornerPosSS, rawDepth, _InvProjMatrix);
float2 centerPosSS = posInput.positionSS;
float2 cornerPosSS = centerPosSS + 0.5 * _ScreenSize.zw;
float centerDepth = LOAD_TEXTURE2D(_MainDepthTexture, posInput.unPositionSS).r;
float3 centerPosVS = ComputeViewSpacePosition(centerPosSS, centerDepth, _InvProjMatrix);
float3 cornerPosVS = ComputeViewSpacePosition(cornerPosSS, centerDepth, _InvProjMatrix);
// Compute the view-space dimensions of the pixel as a quad projected onto geometry.
float2 unitsPerPixel = 2 * (cornerPosVS.xy - centerPosVS.xy);

// Take the first (central) sample.
float2 samplePosition = posInput.unPositionSS;
float3 sampleIrradiance = LOAD_TEXTURE2D(_IrradianceSource, samplePosition).rgb;
float2 centerPosition = posInput.unPositionSS;
float3 centerIrradiance = LOAD_TEXTURE2D(_IrradianceSource, centerPosition).rgb;
float maxDistancePixels = maxDistance * max(scaledPixPerMm.x, scaledPixPerMm.y);

#if SSS_DEBUG
return float4(0, 0, 1, 1);
#else
return float4(bsdfData.diffuseColor * sampleIrradiance, 1);
return float4(bsdfData.diffuseColor * centerIrradiance, 1);
#endif
}

return float4(0.5, 0.5, 0, 1);
#endif
float sampleRcpPdf = _FilterKernelsFarField[profileID][0][1];
float3 sampleWeight = KernelValCircle(0, shapeParam) * sampleRcpPdf;
float centerRcpPdf = _FilterKernelsFarField[profileID][0][1];
float3 centerWeight = KernelValCircle(0, shapeParam) * centerRcpPdf;
totalIrradiance = sampleWeight * sampleIrradiance;
totalWeight = sampleWeight;
totalIrradiance = centerWeight * centerIrradiance;
totalWeight = centerWeight;
// Perform integration over the screen-aligned plane in the view space.
// TODO: it would be more accurate to use the tangent plane in the world space.

// Everything except for the radius is a compile-time constant.
float r = _FilterKernelsFarField[profileID][i][0];
float phi = TWO_PI * Fibonacci2d(i, SSS_N_SAMPLES_FAR_FIELD).y;
float2 pos = r * float2(cos(phi), sin(phi));
samplePosition = posInput.unPositionSS + pos * scaledPixPerMm;
sampleRcpPdf = _FilterKernelsFarField[profileID][i][1];
rawDepth = LOAD_TEXTURE2D(_MainDepthTexture, samplePosition).r;
sampleIrradiance = LOAD_TEXTURE2D(_IrradianceSource, samplePosition).rgb;
[flatten]
if (any(sampleIrradiance) == false)
{
// The irradiance is 0. This could happen for 3 reasons.
// Most likely, the surface fragment does not have an SSS material.
// Alternatively, our sample comes from a region without any geometry.
// Finally, the surface fragment could be completely shadowed.
// Our blur is energy-preserving, so 'sampleWeight' should be set to 0.
// We do not terminate the loop since we want to gather the contribution
// of the remaining samples (e.g. in case of hair covering skin).
continue;
}
// Apply bilateral weighting.
float sampleZ = LinearEyeDepth(rawDepth, _ZBufferParams);
float z = millimPerUnit * sampleZ - (millimPerUnit * centerPosVS.z);
sampleWeight = ComputeBilateralWeight(shapeParam, r, z, rcp(distScale), sampleRcpPdf);
totalIrradiance += sampleWeight * sampleIrradiance;
totalWeight += sampleWeight;
SSS_ITER(i, SSS_N_SAMPLES_FAR_FIELD, _FilterKernelsFarField,
profileID, shapeParam, centerPosition, centerPosVS.z,
millimPerUnit, scaledPixPerMm, rcp(distScale),
totalIrradiance, totalWeight)
}
}
else

#endif
float sampleRcpPdf = _FilterKernelsNearField[profileID][0][1];
float3 sampleWeight = KernelValCircle(0, shapeParam) * sampleRcpPdf;
float centerRcpPdf = _FilterKernelsNearField[profileID][0][1];
float3 centerWeight = KernelValCircle(0, shapeParam) * centerRcpPdf;
totalIrradiance = sampleWeight * sampleIrradiance;
totalWeight = sampleWeight;
totalIrradiance = centerWeight * centerIrradiance;
totalWeight = centerWeight;
// Perform integration over the screen-aligned plane in the view space.
// TODO: it would be more accurate to use the tangent plane in the world space.

// Everything except for the radius is a compile-time constant.
float r = _FilterKernelsNearField[profileID][i][0];
float phi = TWO_PI * Fibonacci2d(i, SSS_N_SAMPLES_NEAR_FIELD).y;
float2 pos = r * float2(cos(phi), sin(phi));
samplePosition = posInput.unPositionSS + pos * scaledPixPerMm;
sampleRcpPdf = _FilterKernelsNearField[profileID][i][1];
rawDepth = LOAD_TEXTURE2D(_MainDepthTexture, samplePosition).r;
sampleIrradiance = LOAD_TEXTURE2D(_IrradianceSource, samplePosition).rgb;
[flatten]
if (any(sampleIrradiance) == false)
{
// The irradiance is 0. This could happen for 3 reasons.
// Most likely, the surface fragment does not have an SSS material.
// Alternatively, our sample comes from a region without any geometry.
// Finally, the surface fragment could be completely shadowed.
// Our blur is energy-preserving, so 'sampleWeight' should be set to 0.
// We do not terminate the loop since we want to gather the contribution
// of the remaining samples (e.g. in case of hair covering skin).
continue;
}
// Apply bilateral weighting.
float sampleZ = LinearEyeDepth(rawDepth, _ZBufferParams);
float z = millimPerUnit * sampleZ - (millimPerUnit * centerPosVS.z);
sampleWeight = ComputeBilateralWeight(shapeParam, r, z, rcp(distScale), sampleRcpPdf);
totalIrradiance += sampleWeight * sampleIrradiance;
totalWeight += sampleWeight;
SSS_ITER(i, SSS_N_SAMPLES_NEAR_FIELD, _FilterKernelsNearField,
profileID, shapeParam, centerPosition, centerPosVS.z,
millimPerUnit, scaledPixPerMm, rcp(distScale),
totalIrradiance, totalWeight)
}
}

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