Texture2DArrayStreaming.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
Texture2DArrayStreaming.h: Helpers to stream in and out texture 2D array LODs.
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "RenderAssetUpdate.h"
#include "Engine/Texture2DArray.h"
#include "Rendering/Texture2DResource.h"
#include "Texture2DMipDataProvider_DDC.h"
#include "Texture2DMipDataProvider_IO.h"
#include "TextureMipAllocator.h"
 
#if WITH_EDITORONLY_DATA
typedef FTexture2DMipDataProvider_DDC FTexture2DArrayMipDataProvider_DDC;
#endif
 
typedef FTexture2DMipDataProvider_IO FTexture2DArrayMipDataProvider_IO;
 
class FTexture2DArrayMipAllocator_Reallocate : public FTextureMipAllocator
{
public:
 
    FTexture2DArrayMipAllocator_Reallocate(UTexture* Texture);
    ~FTexture2DArrayMipAllocator_Reallocate();
 
    // ********************************************************
    // ********* FTextureMipAllocator implementation **********
    // ********************************************************
 
    bool AllocateMips(const FTextureUpdateContext& Context, FTextureMipInfoArray& OutMipInfos, const FTextureUpdateSyncOptions& SyncOptions) final override;
    bool UploadMips(const FTextureUpdateContext& Context, const FTextureUpdateSyncOptions& SyncOptions) final override;
    void Cancel(const FTextureUpdateSyncOptions& SyncOptions) final override;
    ETickThread GetCancelThread() const final override;
 
protected:
 
    // Used to free memory allocated from a TUniquePtr
    struct FMallocDeleter
    {
        void operator() (uint8* Buffer)
        {
            FMemory::Free(Buffer);
        }
    };
 
    // The temporary main memory allocations holding the mip data
    TArray<TUniquePtr<uint8, FMallocDeleter>, TInlineAllocator<MAX_TEXTURE_MIP_COUNT>> StreamedMipData;
    TArray<uint64, TInlineAllocator<MAX_TEXTURE_MIP_COUNT>> StreamedSliceSize;
};