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Fix pre-exposition being applied twice on scene color in hair env lighting pass.

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#rb none
#jira none

[CL 12241402 by Charles deRousiers in 4.25 branch]
This commit is contained in:
Charles deRousiers
2020-03-18 05:51:56 -04:00
parent 39e4c909cb
commit de7dd67b93
1 changed files with 2 additions and 7 deletions
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9
Engine/Shaders/Private/HairStrands/HairStrandsEnvironmentLighting.usf
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@@ -685,11 +685,6 @@ Texture2D<uint4> HairCategorizationTexture;
float3 ComputeThinTransmission(FGBufferData GBuffer, float2 ScreenPosition, float2 SvPosition, uint PrimitiveId)
{
#if USE_PREEXPOSURE
const float PreExposure = View.PreExposure;
#else
const float PreExposure = 1.f;
#endif
const float3 WorldPosition = mul(float4(ScreenPosition * GBuffer.Depth, GBuffer.Depth, 1), View.ScreenToWorld).xyz;
const float3 CameraToPixel = normalize(WorldPosition - View.WorldCameraOrigin);
const uint2 PixelPosition = SvPosition - ResolvedView.ViewRectMin.xy;
@@ -704,11 +699,11 @@ float3 ComputeThinTransmission(FGBufferData GBuffer, float2 ScreenPosition, floa
// value, we divide by the hair coverage
const float4 OccludedLuminance = SceneColorTexture.Load(uint3(PixelPosition, 0));
const float4 Luminance = OccludedLuminance / PixelCoverage;
// The pre-exposure is not applied onto the output as the SceneColorTexture value are already preexposed.
const float SinViewAngle = dot(T, V);
const HairAverageScattering Energy = SampleHairLUT(HairScatteringLUTTexture, HairLUTSampler, GBuffer.BaseColor, GBuffer.Roughness, SinViewAngle);
float3 Color = Energy.A_front * Luminance.xyz * PixelCoverage;
Color *= PreExposure;
return -min(-Color, 0.0);
}