SkeletalMeshHalfEdgeBuffer.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "RenderResource.h"
#include "Containers/DynamicRHIResourceArray.h"
 
class FSkeletalMeshLODRenderData;
class FRHIShaderResourceView;
class FRHIResourceReplaceBatcher;
 
namespace SkeletalMeshHalfEdgeUtility
{
    void ENGINE_API BuildHalfEdgeBuffers(const FSkeletalMeshLODRenderData& InLodRenderData, TResourceArray<int32>& OutVertexToEdge, TResourceArray<int32>& OutEdgeToTwinEdge);
}
 
/*
 * Render resource containing the half edge buffers. 
 */ 
class FSkeletalMeshHalfEdgeBuffer : public FRenderResource
{
public:
    void ENGINE_API Init(const FSkeletalMeshLODRenderData& InLodRenderData);
 
    struct FRHIInfo
    {
        FBufferRHIRef VertexToEdgeBufferRHI;
        FBufferRHIRef EdgeToTwinEdgeBufferRHI;
    };
 
    FRHIInfo CreateRHIBuffer(FRHICommandListBase& RHICmdList);
 
    void InitRHIForStreaming(FRHIInfo RHIInfo, FRHIResourceReplaceBatcher& Batcher);
    void ReleaseRHIForStreaming(FRHIResourceReplaceBatcher& Batcher);
    
    void ENGINE_API InitRHI(FRHICommandListBase& RHICmdList) override;
 
    void ENGINE_API ReleaseRHI() override;
 
    bool ENGINE_API IsCPUDataValid() const;
 
    bool ENGINE_API IsReadyForRendering() const;
    
    void ENGINE_API CleanUp();
 
    int32 GetResourceSize() const;
    
    void Serialize(FArchive& Ar);
    
    friend class FSkeletalMeshLODRenderData;
    friend FArchive& operator<<(FArchive& Ar, FSkeletalMeshHalfEdgeBuffer& MorphTargetVertexInfoBuffers);
 
    FRHIShaderResourceView* GetVertexToEdgeBufferSRV() const
    {
        return VertexToEdgeBufferSRV;
    }
 
    FRHIShaderResourceView* GetEdgeToTwinEdgeBufferSRV() const
    {
        return EdgeToTwinEdgeBufferSRV;
    }
 
    ENGINE_API FSkeletalMeshHalfEdgeBuffer();
    ENGINE_API ~FSkeletalMeshHalfEdgeBuffer();
 
private:
    uint32 GetMinBufferSize() const;
    
    TResourceArray<int32> VertexToEdgeData;
    TResourceArray<int32> EdgeToTwinEdgeData;
    
    FBufferRHIRef VertexToEdgeBufferRHI;
    FShaderResourceViewRHIRef VertexToEdgeBufferSRV;        
    FBufferRHIRef EdgeToTwinEdgeBufferRHI;
    FShaderResourceViewRHIRef EdgeToTwinEdgeBufferSRV;  
};