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1a4651c185
- pixels are bucketed into bilateral grid on fixed size tiles (64x64) - when ViewRect is not a multiple of the tile size, sampling the bilateral grid requires applying a scale to ViewportUV. #jira UE-177099 #rb none [CL 26704112 by tiago costa in 5.3 branch]
75 lines
2.5 KiB
Plaintext
75 lines
2.5 KiB
Plaintext
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "Common.ush"
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#include "ScreenPass.ush"
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#include "PostProcessCommon.ush"
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#include "PostProcessHistogramCommon.ush"
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#include "DeferredShadingCommon.ush"
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#include "TonemapCommon.ush"
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StructuredBuffer<float4> EyeAdaptationBuffer;
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Texture2D HDRSceneColorTexture;
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Texture3D LumBilateralGrid;
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Texture2D BlurredLogLum;
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SamplerState TextureSampler;
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uint DebugMode;
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SCREEN_PASS_TEXTURE_VIEWPORT(Input)
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SCREEN_PASS_TEXTURE_VIEWPORT(Output)
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float4 MainPS(noperspective float4 UVAndScreenPos : TEXCOORD0, float4 SvPosition : SV_POSITION) : SV_Target0
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{
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float2 UV = UVAndScreenPos.xy;
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float2 ViewportUV = (int2(SvPosition.xy) - Output_ViewportMin) * Output_ViewportSizeInverse;
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float2 ExposureScaleMiddleGrey = EyeAdaptationBuffer[0].xw;
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float4 SceneColor = Texture2DSample(HDRSceneColorTexture, TextureSampler, UV) * View.OneOverPreExposure;
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float LuminanceVal = CalculateEyeAdaptationLuminance(SceneColor.rgb);
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float LogLuminance = log2(LuminanceVal);
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float MiddleGreyLumValue = log2(0.18 * ExposureScaleMiddleGrey.y * LocalExposure_MiddleGreyExposureCompensation);
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float BaseLogLum = CalculateBaseLogLuminance(LogLuminance, LocalExposure_BlurredLuminanceBlend, ExposureScaleMiddleGrey.x, ViewportUV, LumBilateralGrid, BlurredLogLum, TextureSampler, TextureSampler);
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float LocalExposure = CalculateLocalExposure(LogLuminance + log2(ExposureScaleMiddleGrey.x), BaseLogLum, MiddleGreyLumValue, LocalExposure_HighlightContrastScale, LocalExposure_ShadowContrastScale, LocalExposure_DetailStrength);
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float DetailLogLum = (LogLuminance + log2(ExposureScaleMiddleGrey.x)) - BaseLogLum;
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float3 OutValue;
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if (DebugMode == 0)
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{
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OutValue = saturate(abs(log2(LocalExposure) / 2)) * lerp(float3(1.0f, 0.0f, 0.0f), float3(0.0f, 1.0f, 0.0f), step(LocalExposure, 1));
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}
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else if (DebugMode == 1)
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{
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OutValue = exp2(BaseLogLum);
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}
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else if (DebugMode == 2)
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{
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OutValue = exp2(DetailLogLum);
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}
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else if (DebugMode == 3)
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{
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float3 BilateralGridUVW;
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BilateralGridUVW.xy = ViewportUV * LocalExposure_BilateralGridUVScale;
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BilateralGridUVW.z = (ComputeHistogramPositionFromLogLuminance(LogLuminance) * (BILATERAL_GRID_DEPTH - 1) + 0.5f) / BILATERAL_GRID_DEPTH;
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float2 BilateralGridLum = Texture3DSample(LumBilateralGrid, TextureSampler, BilateralGridUVW).xy;
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if (BilateralGridLum.y < 0.001)
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{
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// bilateral grid doesn't have valid data
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OutValue = float3(1,0,0);
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}
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else
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{
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OutValue = float3(0,1,0);
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}
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}
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return float4(OutValue, 1.0f);
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} |