MetalRHIStagingBuffer.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    MetalRHIStagingBuffer.h: Metal RHI Staging Buffer Class.
=============================================================================*/
 
#pragma once
 
#include "RHIResources.h"
 
class FMetalDevice;
class FMetalBuffer;
typedef TSharedPtr<FMetalBuffer, ESPMode::ThreadSafe> FMetalBufferPtr;
 
class FMetalRHIStagingBuffer final : public FRHIStagingBuffer
{
    friend class FMetalRHICommandContext;
 
public:
    FMetalRHIStagingBuffer(FMetalDevice& Device);
    virtual ~FMetalRHIStagingBuffer() final override;
 
    virtual void* Lock(uint32 Offset, uint32 NumBytes) final override;
 
    virtual void Unlock() final override;
    
    uint64 GetGPUSizeBytes() const override;
 
private:
    FMetalDevice& Device;
    FMetalBufferPtr ShadowBuffer = nullptr;
};