ParticleSortingGPU.cpp File Reference

#include "Particles/ParticleSortingGPU.h"
#include "Particles/ParticleSimulationGPU.h"
#include "PipelineStateCache.h"
#include "ShaderParameterUtils.h"
#include "GlobalShader.h"
#include "GPUSort.h"
#include "DataDrivenShaderPlatformInfo.h"
#include "RHIContext.h"
#include "ShaderParameterMacros.h"

Classes
class	FParticleSortKeyGenCS

Macros
#define	PARTICLE_KEY_GEN_THREAD_COUNT   64

Typedefs
typedef TUniformBufferRef< FParticleKeyGenParameters >	FParticleKeyGenUniformBufferRef

Functions
	IMPLEMENT_GLOBAL_SHADER_PARAMETER_STRUCT (FParticleKeyGenParameters,"ParticleKeyGen")
	IMPLEMENT_SHADER_TYPE (, FParticleSortKeyGenCS, TEXT("/Engine/Private/ParticleSortKeyGen.usf"), TEXT("GenerateParticleSortKeys"), SF_Compute)
int32	GenerateParticleSortKeys (FRHICommandListImmediate &RHICmdList, FRHIUnorderedAccessView *KeyBufferUAV, FRHIUnorderedAccessView *SortedVertexBufferUAV, FRHITexture *PositionTextureRHI, const TArray< FParticleSimulationSortInfo > &SimulationsToSort, ERHIFeatureLevel::Type FeatureLevel, int32 BatchId)

Macro Definition Documentation

PARTICLE_KEY_GEN_THREAD_COUNT

#define PARTICLE_KEY_GEN_THREAD_COUNT   64

The number of threads per group used to generate particle keys.

Typedef Documentation

FParticleKeyGenUniformBufferRef

typedef TUniformBufferRef<FParticleKeyGenParameters> FParticleKeyGenUniformBufferRef

Function Documentation

GenerateParticleSortKeys()

int32 GenerateParticleSortKeys	(	FRHICommandListImmediate &	RHICmdList,
		FRHIUnorderedAccessView *	KeyBufferUAV,
		FRHIUnorderedAccessView *	SortedVertexBufferUAV,
		FRHITexture *	PositionTextureRHI,
		const TArray< FParticleSimulationSortInfo > &	SimulationsToSort,
		ERHIFeatureLevel::Type	FeatureLevel,
		int32	BatchId
	)

Generate sort keys for a list of particles.

Parameters

KeyBufferUAV	- Unordered access view of the buffer where sort keys will be stored.
SortedVertexBufferUAV	- Unordered access view of the vertex buffer where particle indices will be stored.
PositionTextureRHI	- The texture containing world space positions for all particles.
SimulationsToSort	- A list of simulations to generate sort keys for.

Returns

the total number of particles being sorted.

IMPLEMENT_GLOBAL_SHADER_PARAMETER_STRUCT()

IMPLEMENT_GLOBAL_SHADER_PARAMETER_STRUCT	(	FParticleKeyGenParameters	,
		"ParticleKeyGen"
	)

Uniform buffer parameters for generating particle sort keys.

IMPLEMENT_SHADER_TYPE()

IMPLEMENT_SHADER_TYPE	(	FParticleSortKeyGenCS	,
		TEXT("/Engine/Private/ParticleSortKeyGen.usf")	,
		TEXT("GenerateParticleSortKeys")	,
		SF_Compute
	)