PostProcessLocalExposure.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "ScreenPass.h"
 
class FEyeAdaptationParameters;
 
BEGIN_SHADER_PARAMETER_STRUCT(FLocalExposureParameters, )
    SHADER_PARAMETER(float, HighlightContrastScale)
    SHADER_PARAMETER(float, ShadowContrastScale)
    SHADER_PARAMETER(float, DetailStrength)
    SHADER_PARAMETER(float, BlurredLuminanceBlend)
    SHADER_PARAMETER(float, MiddleGreyExposureCompensation)
    SHADER_PARAMETER(FVector2f, BilateralGridUVScale)
    SHADER_PARAMETER(float, HighlightThreshold)
    SHADER_PARAMETER(float, ShadowThreshold)
    SHADER_PARAMETER(float, HighlightThresholdStrength)
    SHADER_PARAMETER(float, ShadowThresholdStrength)
END_SHADER_PARAMETER_STRUCT()
 
FLocalExposureParameters GetLocalExposureParameters(const FViewInfo& View, FIntPoint ViewRectSize, const FEyeAdaptationParameters& EyeAdaptationParameters);
 
FRDGTextureRef AddLocalExposureBlurredLogLuminancePass(
    FRDGBuilder& GraphBuilder,
    const FViewInfo& View,
    const FEyeAdaptationParameters& EyeAdaptationParameters,
    FScreenPassTextureSlice InputTexture);
 
void AddApplyLocalExposurePass(
    FRDGBuilder& GraphBuilder,
    const FViewInfo& View,
    const FEyeAdaptationParameters& EyeAdaptationParameters,
    FRDGBufferRef EyeAdaptationBuffer,
    const FLocalExposureParameters& LocalExposureParamaters,
    FRDGTextureRef LocalExposureTexture,
    FRDGTextureRef BlurredLogLuminanceTexture,
    FScreenPassTextureSlice Input,
    FScreenPassTextureSlice Output,
    ERDGPassFlags PassFlags);
 
struct FExposureFusionData
{
    FScreenPassTexture Result;
    FScreenPassTexture Exposures;
    FScreenPassTexture Weights;
};
 
FExposureFusionData AddLocalExposureFusionPass(
    FRDGBuilder& GraphBuilder,
    const FViewInfo& View,
    const FEyeAdaptationParameters& EyeAdaptationParameters,
    FRDGBufferRef EyeAdaptationBuffer,
    const FLocalExposureParameters& LocalExposureParamaters,
    FScreenPassTextureSlice Input);