Texture2DUpdate.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
Texture2DUpdate.h: Helpers to stream in and out mips.
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "RenderAssetUpdate.h"
#include "Engine/Texture2D.h"
#include "Rendering/Texture2DResource.h"
#include "Async/AsyncFileHandle.h"
 
extern TAutoConsoleVariable<int32> CVarFlushRHIThreadOnSTreamingTextureLocks;
 
struct FTexture2DUpdateContext
{
    typedef int32 EThreadType;
 
    FTexture2DUpdateContext(const UTexture2D* InTexture, EThreadType InCurrentThread);
 
    FTexture2DUpdateContext(const UStreamableRenderAsset* InTexture, EThreadType InCurrentThread);
 
    EThreadType GetCurrentThread() const
    {
        return CurrentThread;
    }
 
    const UTexture2D* Texture = nullptr;
    FTexture2DResource* Resource = nullptr;
    TArrayView<const FTexture2DMipMap*> MipsView;
    EThreadType CurrentThread = 0;
};
 
// Declare that TRenderAssetUpdate is instantiated for FTexture2DUpdateContext
extern template class TRenderAssetUpdate<FTexture2DUpdateContext>;
 
class FTexture2DUpdate : public TRenderAssetUpdate<FTexture2DUpdateContext>
{
public:
    FTexture2DUpdate(UTexture2D* InTexture);
 
protected:
 
    virtual ~FTexture2DUpdate();
 
    // ****************************
    // ********* Helpers **********
    // ****************************
 
    void DoAsyncReallocate(const FContext& Context);
    void DoConvertToVirtualWithNewMips(const FContext& Context);
    bool DoConvertToNonVirtual(const FContext& Context);
    void DoFinishUpdate(const FContext& Context);
 
    FTextureRHIRef IntermediateTextureRHI;
};