Engine/Source/Runtime/Renderer/Private/PostProcess/PostProcessLocalExposure.h

// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include "ScreenPass.h"

class FEyeAdaptationParameters;

FRDGTextureRef AddLocalExposureBlurredLogLuminancePass(
	FRDGBuilder& GraphBuilder,
	const FViewInfo& View,
	const FEyeAdaptationParameters& EyeAdaptationParameters,
	FScreenPassTexture InputTexture);

void AddApplyLocalExposurePass(
	FRDGBuilder& GraphBuilder,
	const FViewInfo& View,
	const FEyeAdaptationParameters& EyeAdaptationParameters,
	FRDGTextureRef EyeAdaptationTexture,
	FRDGTextureRef LocalExposureTexture,
	FRDGTextureRef BlurredLogLuminanceTexture,
	FScreenPassTexture Input,
	FScreenPassTexture Output,
	ERDGPassFlags PassFlags);
Local Exposure using Bilaterial Grid based Contrast Reduction. - 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 #ROBOMERGE-BOT: (v865-17346139) [CL 17387198 by tiago costa in ue5-main branch] 2021-09-01 11:20:37 -04:00			`// Copyright Epic Games, Inc. All Rights Reserved.`

			`#pragma once`

			`#include "ScreenPass.h"`

			`class FEyeAdaptationParameters;`

			`FRDGTextureRef AddLocalExposureBlurredLogLuminancePass(`
			`FRDGBuilder& GraphBuilder,`
			`const FViewInfo& View,`
			`const FEyeAdaptationParameters& EyeAdaptationParameters,`
			`FScreenPassTexture InputTexture);`
Apply local exposure when calculating bloom. - Otherwise bloom intensity will not properly match the bright regions of the final image. - Can be disabled using r.Bloom.ApplyLocalExposure. - For gaussian bloom, local exposure is applied during the setup pass. - For FFT bloom, local exposure is applied using an extra pass before convolution. - Implemented AddApplyLocalExposurePass which apply local exposure to an input texture. #rb Guillaume.Abadie #preflight 62b5f2e8bd4bf89e21c78caa #jira FORT-460700 [CL 20812852 by tiago costa in ue5-main branch] 2022-06-24 13:53:19 -04:00
			`void AddApplyLocalExposurePass(`
			`FRDGBuilder& GraphBuilder,`
			`const FViewInfo& View,`
			`const FEyeAdaptationParameters& EyeAdaptationParameters,`
			`FRDGTextureRef EyeAdaptationTexture,`
			`FRDGTextureRef LocalExposureTexture,`
			`FRDGTextureRef BlurredLogLuminanceTexture,`
			`FScreenPassTexture Input,`
			`FScreenPassTexture Output,`
			`ERDGPassFlags PassFlags);`