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- Image exposure is locally adjusted by decomposing luminance of the frame into a base layer and a detail layer. - Base layer contrast can be reduced while preserving detail. - Support blending with gaussian blurred luminance as proposed in Advances in Real-Time Rendering in Games 2021. - Controls in PostProcessVolume. - r.LocalExposure cvar to control whether local exposure is supported. - Visualization mode in "Show->Visualize->Local Expsoure". Multiple modes controllable using r.LocalExposure.VisualizeDebugMode. - Bilateral grid generation not yet optimized. Optimization should include increasing depth of grid to match histogram size so that global histogram can be generated from grid. - Added option to use mirror address mode in PostProcessWeightedSampleSum, since black border adds noticeable vignetting to the blurred luminance. #preflight 612f65169db3090001ba3eec #rb Brian.Karis, Guillaume.Abadie, Krzysztof.Narkowicz #ROBOMERGE-SOURCE: CL 17385317 via CL 17387198 #ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v865-17346139) [CL 17387234 by tiago costa in ue5-release-engine-test branch]
105 lines
4.2 KiB
C++
105 lines
4.2 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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PostProcessLocalExposure.cpp: Post processing local exposure implementation.
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=============================================================================*/
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#include "PostProcess/PostProcessLocalExposure.h"
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#include "PostProcess/PostProcessEyeAdaptation.h"
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#include "PostProcess/PostProcessWeightedSampleSum.h"
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#include "ShaderCompilerCore.h"
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namespace
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{
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class FSetupLogLuminanceCS : public FGlobalShader
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{
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public:
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// Changing these numbers requires LocalExposure.usf to be recompiled
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static const uint32 ThreadGroupSizeX = 8;
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static const uint32 ThreadGroupSizeY = 8;
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DECLARE_GLOBAL_SHADER(FSetupLogLuminanceCS);
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SHADER_USE_PARAMETER_STRUCT(FSetupLogLuminanceCS, FGlobalShader);
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BEGIN_SHADER_PARAMETER_STRUCT(FParameters, )
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SHADER_PARAMETER_STRUCT_REF(FViewUniformShaderParameters, View)
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SHADER_PARAMETER_STRUCT(FEyeAdaptationParameters, EyeAdaptation)
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SHADER_PARAMETER_STRUCT(FScreenPassTextureViewportParameters, Input)
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SHADER_PARAMETER_RDG_TEXTURE(Texture2D, InputTexture)
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SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2D<float>, Output2DFRW)
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END_SHADER_PARAMETER_STRUCT()
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static bool ShouldCompilePermutation(const FGlobalShaderPermutationParameters& Parameters)
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{
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return IsFeatureLevelSupported(Parameters.Platform, ERHIFeatureLevel::SM5);
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}
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static void ModifyCompilationEnvironment(const FGlobalShaderPermutationParameters& Parameters, FShaderCompilerEnvironment& OutEnvironment)
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{
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FGlobalShader::ModifyCompilationEnvironment(Parameters, OutEnvironment);
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OutEnvironment.SetDefine(TEXT("THREADGROUP_SIZEX"), ThreadGroupSizeX);
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OutEnvironment.SetDefine(TEXT("THREADGROUP_SIZEY"), ThreadGroupSizeY);
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OutEnvironment.CompilerFlags.Add(CFLAG_StandardOptimization);
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}
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};
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IMPLEMENT_GLOBAL_SHADER(FSetupLogLuminanceCS, "/Engine/Private/PostProcessLocalExposure.usf", "SetupLogLuminanceCS", SF_Compute);
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} //! namespace
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FRDGTextureRef AddLocalExposureBlurredLogLuminancePass(
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FRDGBuilder& GraphBuilder,
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const FViewInfo& View,
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const FEyeAdaptationParameters& EyeAdaptationParameters,
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FScreenPassTexture InputTexture)
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{
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check(InputTexture.IsValid());
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RDG_EVENT_SCOPE(GraphBuilder, "LocalExposure - Blurred Luminance");
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FRDGTextureRef GaussianLumSetupTexture;
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// Copy log luminance to temporary texture
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{
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const FRDGTextureDesc TextureDesc = FRDGTextureDesc::Create2D(
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InputTexture.ViewRect.Size(),
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PF_R16F,
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FClearValueBinding::None,
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TexCreate_UAV | TexCreate_ShaderResource);
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GaussianLumSetupTexture = GraphBuilder.CreateTexture(TextureDesc, TEXT("GaussianLumSetupTexture"));
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auto* PassParameters = GraphBuilder.AllocParameters<FSetupLogLuminanceCS::FParameters>();
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PassParameters->View = View.ViewUniformBuffer;
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PassParameters->EyeAdaptation = EyeAdaptationParameters;
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PassParameters->Input = GetScreenPassTextureViewportParameters(FScreenPassTextureViewport(InputTexture));
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PassParameters->InputTexture = InputTexture.Texture;
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PassParameters->Output2DFRW = GraphBuilder.CreateUAV(GaussianLumSetupTexture);
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FComputeShaderUtils::AddPass(
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GraphBuilder,
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RDG_EVENT_NAME("SetupLogLuminance %dx%d", GaussianLumSetupTexture->Desc.Extent.X, GaussianLumSetupTexture->Desc.Extent.Y),
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ERDGPassFlags::Compute,
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View.ShaderMap->GetShader<FSetupLogLuminanceCS>(),
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PassParameters,
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FComputeShaderUtils::GetGroupCount(GaussianLumSetupTexture->Desc.Extent, FIntPoint(FSetupLogLuminanceCS::ThreadGroupSizeX, FSetupLogLuminanceCS::ThreadGroupSizeY)));
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}
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FRDGTextureRef GaussianTexture;
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{
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FGaussianBlurInputs GaussianBlurInputs;
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GaussianBlurInputs.NameX = TEXT("LocalExposureGaussianX");
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GaussianBlurInputs.NameY = TEXT("LocalExposureGaussianY");
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GaussianBlurInputs.Filter = FScreenPassTexture(GaussianLumSetupTexture, InputTexture.ViewRect);
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GaussianBlurInputs.TintColor = FLinearColor::White;
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GaussianBlurInputs.CrossCenterWeight = FVector2D::ZeroVector;
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GaussianBlurInputs.KernelSizePercent = View.FinalPostProcessSettings.LocalExposureBlurredLuminanceKernelSizePercent;
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GaussianBlurInputs.UseMirrorAddressMode = true;
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GaussianTexture = AddGaussianBlurPass(GraphBuilder, View, GaussianBlurInputs).Texture;
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}
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return GaussianTexture;
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} |