SceneTextureReductions.cpp File Reference

#include "SceneTextureReductions.h"
#include "DataDrivenShaderPlatformInfo.h"
#include "ScenePrivate.h"
#include "RenderGraph.h"
#include "PixelShaderUtils.h"
#include "SceneTextureParameters.h"
#include "PostProcess/PostProcessing.h"
#include "Froxel/Froxel.h"

Classes
class	FHZBBuildPS
class	FHZBBuildCS

Functions
	IMPLEMENT_GLOBAL_SHADER (FHZBBuildPS, "/Engine/Private/HZB.usf", "HZBBuildPS", SF_Pixel)
	IMPLEMENT_GLOBAL_SHADER (FHZBBuildCS, "/Engine/Private/HZB.usf", "HZBBuildCS", SF_Compute)
void	BuildHZB (FRDGBuilder &GraphBuilder, FRDGTextureRef SceneDepth, FRDGTextureRef VisBufferTexture, const FIntRect ViewRect, ERHIFeatureLevel::Type FeatureLevel, EShaderPlatform ShaderPlatform, const TCHAR *ClosestHZBName, FRDGTextureRef *OutClosestHZBTexture, const TCHAR *FurthestHZBName, FRDGTextureRef *OutFurthestHZBTexture, EPixelFormat Format, const FBuildHZBAsyncComputeParams *AsyncComputeParams, const Froxel::FViewData *OutFroxelViewData, FExtraParameters ExtraParameters)
void	BuildHZBFurthest (FRDGBuilder &GraphBuilder, FRDGTextureRef SceneDepth, FRDGTextureRef VisBufferTexture, const FIntRect ViewRect, ERHIFeatureLevel::Type FeatureLevel, EShaderPlatform ShaderPlatform, const TCHAR *FurthestHZBName, FRDGTextureRef *OutFurthestHZBTexture, EPixelFormat Format, const FBuildHZBAsyncComputeParams *AsyncComputeParams, FExtraParameters ExtraParameters)

Function Documentation

BuildHZB()

void BuildHZB	(	FRDGBuilder &	GraphBuilder,
		FRDGTextureRef	SceneDepth,
		FRDGTextureRef	VisBufferTexture,
		const FIntRect	ViewRect,
		ERHIFeatureLevel::Type	FeatureLevel,
		EShaderPlatform	ShaderPlatform,
		const TCHAR *	ClosestHZBName,
		FRDGTextureRef *	OutClosestHZBTexture,
		const TCHAR *	FurthestHZBName,
		FRDGTextureRef *	OutFurthestHZBTexture,
		EPixelFormat	Format,
		const FBuildHZBAsyncComputeParams *	AsyncComputeParams,
		const Froxel::FViewData *	OutFroxelViewData,
		FExtraParameters	ExtraParameters
	)

Closest and furthest HZB are intentionally in separate render target, because majority of the case you only one or the other. Keeping them separate avoid doubling the size in cache for this cases, to avoid performance regression.

BuildHZBFurthest()

void BuildHZBFurthest	(	FRDGBuilder &	GraphBuilder,
		FRDGTextureRef	SceneDepth,
		FRDGTextureRef	VisBufferTexture,
		const FIntRect	ViewRect,
		ERHIFeatureLevel::Type	FeatureLevel,
		EShaderPlatform	ShaderPlatform,
		const TCHAR *	FurthestHZBName,
		FRDGTextureRef *	OutFurthestHZBTexture,
		EPixelFormat	Format,
		const FBuildHZBAsyncComputeParams *	AsyncComputeParams,
		FExtraParameters	ExtraParameters
	)

IMPLEMENT_GLOBAL_SHADER() [1/2]

IMPLEMENT_GLOBAL_SHADER	(	FHZBBuildCS	,
		"/Engine/Private/HZB.usf"	,
		"HZBBuildCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [2/2]

IMPLEMENT_GLOBAL_SHADER	(	FHZBBuildPS	,
		"/Engine/Private/HZB.usf"	,
		"HZBBuildPS"	,
		SF_Pixel
	)