ParticleSortingGPU.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*==============================================================================
    ParticleSortingGPU.h: Interface for sorting GPU particles.
==============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "RenderResource.h"
#include "GPUSortManager.h"
 
struct FParticleSimulationSortInfo
{
    typedef FGPUSortManager::FAllocationInfo FAllocationInfo;
 
    FParticleSimulationSortInfo(FRHIShaderResourceView* InVertexBufferSRV, const FVector& InViewOrigin, uint32 InParticleCount, const FAllocationInfo& InAllocationInfo) 
        : VertexBufferSRV(InVertexBufferSRV)
        , ViewOrigin(InViewOrigin) 
        , ParticleCount(InParticleCount) 
        , AllocationInfo(InAllocationInfo)
    {}
 
    FRHIShaderResourceView* VertexBufferSRV = nullptr;
    FVector ViewOrigin;
    uint32 ParticleCount = 0;
 
    // The GPUSortManager bindings for this sort task.
    FGPUSortManager::FAllocationInfo AllocationInfo;
};
 
int32 GenerateParticleSortKeys(
    FRHICommandListImmediate& RHICmdList,
    FRHIUnorderedAccessView* KeyBufferUAV,
    FRHIUnorderedAccessView* SortedVertexBufferUAV,
    FRHITexture* PositionTextureRHI,
    const TArray<FParticleSimulationSortInfo>& SimulationsToSort,
    ERHIFeatureLevel::Type FeatureLevel,
    int32 BatchId = INDEX_NONE);