Texture2DMipDataProvider_DDC.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
Texture2DMipDataProvider_DDC.h : Implementation of FTextureMipDataProvider using DDC requests.
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "Memory/SharedBuffer.h"
#include "Streaming/TextureMipDataProvider.h"
#include "UObject/WeakObjectPtr.h"
 
#if WITH_EDITORONLY_DATA
#include "DerivedDataRequestOwner.h"
 
class FTexture2DMipDataProvider_DDC : public FTextureMipDataProvider
{
public:
 
    FTexture2DMipDataProvider_DDC(UTexture* Texture);
    ~FTexture2DMipDataProvider_DDC();
 
 
    // ********************************************************
    // ********* FTextureMipDataProvider implementation **********
    // ********************************************************
 
    void Init(const FTextureUpdateContext& Context, const FTextureUpdateSyncOptions& SyncOptions) final override;
    int32 GetMips(const FTextureUpdateContext& Context, int32 StartingMipIndex, const FTextureMipInfoArray& MipInfos, const FTextureUpdateSyncOptions& SyncOptions) final override;
    bool PollMips(const FTextureUpdateSyncOptions& SyncOptions) final override;
    void CleanUp(const FTextureUpdateSyncOptions& SyncOptions) final override;
    void Cancel(const FTextureUpdateSyncOptions& SyncOptions) final override;
    ETickThread GetCancelThread() const final override;
 
protected:
 
    void ReleaseDDCResources();
 
    bool SerializeMipInfo(const FTextureUpdateContext& Context, FArchive& Ar, int32 MipIndex, int64 MipSize, const FTextureMipInfo& OutMipInfo);
 
private:
 
    TArray<FSharedBuffer, TInlineAllocator<MAX_TEXTURE_MIP_COUNT> > DDCBuffers;
    UE::DerivedData::FRequestOwner DDCRequestOwner;
    TWeakObjectPtr<UTexture> Texture;
};
 
#endif //WITH_EDITORONLY_DATA