#include "RendererPrivate.h"
#include "LightRendering.h"
#include "ScenePrivate.h"
#include "SceneUtils.h"
#include "PipelineStateCache.h"
#include "ShaderParameterStruct.h"
#include "PixelShaderUtils.h"
#include "DistanceFieldLightingShared.h"
#include "LumenMeshCards.h"
#include "LumenTracingUtils.h"

Classes
class	FCullMeshSDFObjectsForViewCS

class	FCombineObjectIndexBuffersCS

class	FMeshSDFObjectCullVS

class	FMeshSDFObjectCullPS

class	FCompactCulledObjectsCS

class	FComputeCulledObjectsStartOffsetCS

class	FObjectCullingContext

class	FCullHeightfieldObjectsForViewCS

Functions
FAutoConsoleVariableRef	CVarMeshSDFAverageCulledCount (TEXT("r.Lumen.DiffuseIndirect.MeshSDF.AverageCulledCount"), GMeshSDFAverageCulledCount, TEXT(""), ECVF_Scalability\|ECVF_RenderThreadSafe)

FAutoConsoleVariableRef	CVarMeshSDFRadiusThreshold (TEXT("r.Lumen.DiffuseIndirect.MeshSDF.RadiusThreshold"), GMeshSDFRadiusThreshold, TEXT(""), ECVF_Scalability\|ECVF_RenderThreadSafe)

FAutoConsoleVariableRef	CVarMeshSDFNotCoveredExpandSurfaceScale (TEXT("r.Lumen.DiffuseIndirect.MeshSDF.NotCoveredExpandSurfaceScale"), GMeshSDFNotCoveredExpandSurfaceScale, TEXT("Scales the surface expand used for Mesh SDFs that contain mostly two sided materials (foliage)"), ECVF_Scalability\|ECVF_RenderThreadSafe)

FAutoConsoleVariableRef	CVarMeshSDFNotCoveredMinStepScale (TEXT("r.Lumen.DiffuseIndirect.MeshSDF.NotCoveredMinStepScale"), GMeshSDFNotCoveredMinStepScale, TEXT("Scales the min step size to improve performance, for Mesh SDFs that contain mostly two sided materials (foliage)"), ECVF_Scalability\|ECVF_RenderThreadSafe)

FAutoConsoleVariableRef	CVarMeshSDFDitheredTransparencyStepThreshold (TEXT("r.Lumen.DiffuseIndirect.MeshSDF.DitheredTransparencyStepThreshold"), GMeshSDFDitheredTransparencyStepThreshold, TEXT("Per-step stochastic semi-transparency threshold, for tracing users that have dithered transparency enabled, for Mesh SDFs that contain mostly two sided materials (foliage)"), ECVF_Scalability\|ECVF_RenderThreadSafe)

void	SetupLumenMeshSDFTracingParameters (FRDGBuilder &GraphBuilder, const FScene *Scene, const FViewInfo &View, FLumenMeshSDFTracingParameters &OutParameters)

	IMPLEMENT_GLOBAL_SHADER (FCullMeshSDFObjectsForViewCS, "/Engine/Private/Lumen/LumenMeshSDFCulling.usf", "CullMeshSDFObjectsForViewCS", SF_Compute)

	IMPLEMENT_GLOBAL_SHADER (FCombineObjectIndexBuffersCS, "/Engine/Private/Lumen/LumenMeshSDFCulling.usf", "CombineObjectIndexBuffersCS", SF_Compute)

	IMPLEMENT_GLOBAL_SHADER (FMeshSDFObjectCullVS, "/Engine/Private/Lumen/LumenMeshSDFCulling.usf", "MeshSDFObjectCullVS", SF_Vertex)

	IMPLEMENT_GLOBAL_SHADER (FMeshSDFObjectCullPS, "/Engine/Private/Lumen/LumenMeshSDFCulling.usf", "MeshSDFObjectCullPS", SF_Pixel)

	IMPLEMENT_GLOBAL_SHADER (FCompactCulledObjectsCS, "/Engine/Private/Lumen/LumenMeshSDFCulling.usf", "CompactCulledObjectsCS", SF_Compute)

	IMPLEMENT_GLOBAL_SHADER (FComputeCulledObjectsStartOffsetCS, "/Engine/Private/Lumen/LumenMeshSDFCulling.usf", "ComputeCulledObjectsStartOffsetCS", SF_Compute)

void	InitObjectCullingContext (FRDGBuilder &GraphBuilder, uint32 NumCullGridCells, FObjectCullingContext &Context)

void	FillGridParameters (FRDGBuilder &GraphBuilder, const FScene Scene, const FViewInfo &View, const FObjectCullingContext Context, FLumenMeshSDFGridParameters &OutGridParameters)

	IMPLEMENT_GLOBAL_SHADER (FCullHeightfieldObjectsForViewCS, "/Engine/Private/Lumen/LumenMeshSDFCulling.usf", "CullHeightfieldObjectsForViewCS", SF_Compute)

void	CombineObjectIndexBuffers (FRDGBuilder &GraphBuilder, const FScene *Scene, const FViewInfo &View, bool bCullMeshSDFObjects, bool bCullHeightfieldObjects, FObjectCullingContext &Context, FRDGBufferRef &CombinedObjectIndexBuffer)

void	CullHeightfieldObjectsForView (FRDGBuilder &GraphBuilder, const FScene *Scene, const FViewInfo &View, const FLumenSceneFrameTemporaries &FrameTemporaries, float MaxMeshSDFInfluenceRadius, float CardTraceEndDistanceFromCamera, FRDGBufferRef &NumHeightfieldCulledObjects, FRDGBufferRef &HeightfieldObjectIndexBuffer, FRDGBufferRef &HeightfieldObjectIndirectArguments)

void	CullMeshSDFObjectsForView (FRDGBuilder &GraphBuilder, const FScene *Scene, const FViewInfo &View, float MaxMeshSDFInfluenceRadius, float CardTraceEndDistanceFromCamera, FObjectCullingContext &Context)

void	CompactCulledObjectArray (FRDGBuilder &GraphBuilder, const FScene *Scene, const FViewInfo &View, FObjectCullingContext &Context, ERDGPassFlags ComputePassFlags)

void	CullObjectsToGrid (const FViewInfo &View, const FScene *Scene, const FLumenSceneFrameTemporaries &FrameTemporaries, float MaxMeshSDFInfluenceRadius, float CardTraceEndDistanceFromCamera, int32 GridPixelsPerCellXY, int32 GridSizeZ, FVector ZParams, FIntVector CullGridSize, FRDGBuilder &GraphBuilder, FRDGBufferRef ObjectIndexBuffer, FObjectCullingContext &Context)

void	CullMeshObjectsToViewGrid (const FViewInfo &View, const FScene *Scene, const FLumenSceneFrameTemporaries &FrameTemporaries, float MaxMeshSDFInfluenceRadius, float CardTraceEndDistanceFromCamera, int32 GridPixelsPerCellXY, int32 GridSizeZ, FVector ZParams, FRDGBuilder &GraphBuilder, FLumenMeshSDFGridParameters &OutGridParameters, ERDGPassFlags ComputePassFlags)

Variables
int32	GMeshSDFAverageCulledCount = 512

float	GMeshSDFRadiusThreshold = 30

float	GMeshSDFNotCoveredExpandSurfaceScale = .6f

float	GMeshSDFNotCoveredMinStepScale = 32

float	GMeshSDFDitheredTransparencyStepThreshold = .1f

uint32	CullMeshSDFObjectsForViewGroupSize = 64

uint32	ComputeCulledMeshSDFObjectsStartOffsetGroupSize = 64

Function Documentation

◆ CombineObjectIndexBuffers()

void CombineObjectIndexBuffers	(	FRDGBuilder &	GraphBuilder,
		const FScene *	Scene,
		const FViewInfo &	View,
		bool	bCullMeshSDFObjects,
		bool	bCullHeightfieldObjects,
		FObjectCullingContext &	Context,
		FRDGBufferRef &	CombinedObjectIndexBuffer
	)

◆ CompactCulledObjectArray()

void CompactCulledObjectArray	(	FRDGBuilder &	GraphBuilder,
		const FScene *	Scene,
		const FViewInfo &	View,
		FObjectCullingContext &	Context,
		ERDGPassFlags	ComputePassFlags
	)

◆ CullHeightfieldObjectsForView()

void CullHeightfieldObjectsForView	(	FRDGBuilder &	GraphBuilder,
		const FScene *	Scene,
		const FViewInfo &	View,
		const FLumenSceneFrameTemporaries &	FrameTemporaries,
		float	MaxMeshSDFInfluenceRadius,
		float	CardTraceEndDistanceFromCamera,
		FRDGBufferRef &	NumHeightfieldCulledObjects,
		FRDGBufferRef &	HeightfieldObjectIndexBuffer,
		FRDGBufferRef &	HeightfieldObjectIndirectArguments
	)

◆ CullMeshObjectsToViewGrid()

void CullMeshObjectsToViewGrid	(	const FViewInfo &	View,
		const FScene *	Scene,
		const FLumenSceneFrameTemporaries &	FrameTemporaries,
		float	MaxMeshSDFInfluenceRadius,
		float	CardTraceEndDistanceFromCamera,
		int32	GridPixelsPerCellXY,
		int32	GridSizeZ,
		FVector	ZParams,
		FRDGBuilder &	GraphBuilder,
		FLumenMeshSDFGridParameters &	OutGridParameters,
		ERDGPassFlags	ComputePassFlags
	)

◆ CullMeshSDFObjectsForView()

void CullMeshSDFObjectsForView	(	FRDGBuilder &	GraphBuilder,
		const FScene *	Scene,
		const FViewInfo &	View,
		float	MaxMeshSDFInfluenceRadius,
		float	CardTraceEndDistanceFromCamera,
		FObjectCullingContext &	Context
	)

◆ CullObjectsToGrid()

void CullObjectsToGrid	(	const FViewInfo &	View,
		const FScene *	Scene,
		const FLumenSceneFrameTemporaries &	FrameTemporaries,
		float	MaxMeshSDFInfluenceRadius,
		float	CardTraceEndDistanceFromCamera,
		int32	GridPixelsPerCellXY,
		int32	GridSizeZ,
		FVector	ZParams,
		FIntVector	CullGridSize,
		FRDGBuilder &	GraphBuilder,
		FRDGBufferRef	ObjectIndexBuffer,
		FObjectCullingContext &	Context
	)

◆ CVarMeshSDFAverageCulledCount()

FAutoConsoleVariableRef CVarMeshSDFAverageCulledCount	(	TEXT("r.Lumen.DiffuseIndirect.MeshSDF.AverageCulledCount")	,
		GMeshSDFAverageCulledCount	,
		TEXT("")	,
		ECVF_Scalability\|	ECVF_RenderThreadSafe
	)

◆ CVarMeshSDFDitheredTransparencyStepThreshold()

FAutoConsoleVariableRef CVarMeshSDFDitheredTransparencyStepThreshold	(	TEXT("r.Lumen.DiffuseIndirect.MeshSDF.DitheredTransparencyStepThreshold")	,
		GMeshSDFDitheredTransparencyStepThreshold	,
		TEXT("Per-step stochastic semi-transparency threshold, for tracing users that have dithered transparency enabled, for Mesh SDFs that contain mostly two sided materials (foliage)")	,
		ECVF_Scalability\|	ECVF_RenderThreadSafe
	)

◆ CVarMeshSDFNotCoveredExpandSurfaceScale()

FAutoConsoleVariableRef CVarMeshSDFNotCoveredExpandSurfaceScale	(	TEXT("r.Lumen.DiffuseIndirect.MeshSDF.NotCoveredExpandSurfaceScale")	,
		GMeshSDFNotCoveredExpandSurfaceScale	,
		TEXT("Scales the surface expand used for Mesh SDFs that contain mostly two sided materials (foliage)")	,
		ECVF_Scalability\|	ECVF_RenderThreadSafe
	)

◆ CVarMeshSDFNotCoveredMinStepScale()

FAutoConsoleVariableRef CVarMeshSDFNotCoveredMinStepScale	(	TEXT("r.Lumen.DiffuseIndirect.MeshSDF.NotCoveredMinStepScale")	,
		GMeshSDFNotCoveredMinStepScale	,
		TEXT("Scales the min step size to improve performance, for Mesh SDFs that contain mostly two sided materials (foliage)")	,
		ECVF_Scalability\|	ECVF_RenderThreadSafe
	)

◆ CVarMeshSDFRadiusThreshold()

FAutoConsoleVariableRef CVarMeshSDFRadiusThreshold	(	TEXT("r.Lumen.DiffuseIndirect.MeshSDF.RadiusThreshold")	,
		GMeshSDFRadiusThreshold	,
		TEXT("")	,
		ECVF_Scalability\|	ECVF_RenderThreadSafe
	)

◆ FillGridParameters()

void FillGridParameters	(	FRDGBuilder &	GraphBuilder,
		const FScene *	Scene,
		const FViewInfo &	View,
		const FObjectCullingContext *	Context,
		FLumenMeshSDFGridParameters &	OutGridParameters
	)

◆ IMPLEMENT_GLOBAL_SHADER() [1/7]

IMPLEMENT_GLOBAL_SHADER	(	FCombineObjectIndexBuffersCS	,
		"/Engine/Private/Lumen/LumenMeshSDFCulling.usf"	,
		"CombineObjectIndexBuffersCS"	,
		SF_Compute
	)

◆ IMPLEMENT_GLOBAL_SHADER() [2/7]

IMPLEMENT_GLOBAL_SHADER	(	FCompactCulledObjectsCS	,
		"/Engine/Private/Lumen/LumenMeshSDFCulling.usf"	,
		"CompactCulledObjectsCS"	,
		SF_Compute
	)

◆ IMPLEMENT_GLOBAL_SHADER() [3/7]

IMPLEMENT_GLOBAL_SHADER	(	FComputeCulledObjectsStartOffsetCS	,
		"/Engine/Private/Lumen/LumenMeshSDFCulling.usf"	,
		"ComputeCulledObjectsStartOffsetCS"	,
		SF_Compute
	)

◆ IMPLEMENT_GLOBAL_SHADER() [4/7]

IMPLEMENT_GLOBAL_SHADER	(	FCullHeightfieldObjectsForViewCS	,
		"/Engine/Private/Lumen/LumenMeshSDFCulling.usf"	,
		"CullHeightfieldObjectsForViewCS"	,
		SF_Compute
	)

◆ IMPLEMENT_GLOBAL_SHADER() [5/7]

IMPLEMENT_GLOBAL_SHADER	(	FCullMeshSDFObjectsForViewCS	,
		"/Engine/Private/Lumen/LumenMeshSDFCulling.usf"	,
		"CullMeshSDFObjectsForViewCS"	,
		SF_Compute
	)

◆ IMPLEMENT_GLOBAL_SHADER() [6/7]

IMPLEMENT_GLOBAL_SHADER	(	FMeshSDFObjectCullPS	,
		"/Engine/Private/Lumen/LumenMeshSDFCulling.usf"	,
		"MeshSDFObjectCullPS"	,
		SF_Pixel
	)

◆ IMPLEMENT_GLOBAL_SHADER() [7/7]

IMPLEMENT_GLOBAL_SHADER	(	FMeshSDFObjectCullVS	,
		"/Engine/Private/Lumen/LumenMeshSDFCulling.usf"	,
		"MeshSDFObjectCullVS"	,
		SF_Vertex
	)

◆ InitObjectCullingContext()

void InitObjectCullingContext	(	FRDGBuilder &	GraphBuilder,
		uint32	NumCullGridCells,
		FObjectCullingContext &	Context
	)

◆ SetupLumenMeshSDFTracingParameters()

void SetupLumenMeshSDFTracingParameters	(	FRDGBuilder &	GraphBuilder,
		const FScene *	Scene,
		const FViewInfo &	View,
		FLumenMeshSDFTracingParameters &	OutParameters
	)

Variable Documentation

◆ ComputeCulledMeshSDFObjectsStartOffsetGroupSize

uint32 ComputeCulledMeshSDFObjectsStartOffsetGroupSize = 64

◆ CullMeshSDFObjectsForViewGroupSize

uint32 CullMeshSDFObjectsForViewGroupSize = 64

◆ GMeshSDFAverageCulledCount

int32 GMeshSDFAverageCulledCount = 512

◆ GMeshSDFDitheredTransparencyStepThreshold

float GMeshSDFDitheredTransparencyStepThreshold = .1f

◆ GMeshSDFNotCoveredExpandSurfaceScale

float GMeshSDFNotCoveredExpandSurfaceScale = .6f

◆ GMeshSDFNotCoveredMinStepScale

float GMeshSDFNotCoveredMinStepScale = 32

◆ GMeshSDFRadiusThreshold

float GMeshSDFRadiusThreshold = 30

Classes

Functions

Variables