Texture2DStreamIn.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
Texture2DStreamIn.h: Stream in helper for 2D textures.
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "Texture2DUpdate.h"
 
// Base StreamIn framework exposing MipData
class FTexture2DStreamIn : public FTexture2DUpdate
{
public:
 
    FTexture2DStreamIn(UTexture2D* InTexture);
    ~FTexture2DStreamIn();
 
protected:
 
    // StreamIn_Default : Locked mips of the intermediate textures, used as disk load destination.
    struct FStreamMipData
    {
        void * Data = nullptr;
        uint32 Pitch = 0;
        // note: Size would be nice but LockTexture doesn't return size
    };
    TArray<FStreamMipData, TInlineAllocator<MAX_TEXTURE_MIP_COUNT> > MipData;
    void * InitialMipDataForAsyncCreate[MAX_TEXTURE_MIP_COUNT];
 
    // ****************************
    // ********* Helpers **********
    // ****************************
 
    // Allocate memory for each mip.
    void DoAllocateNewMips(const FContext& Context);
    // Free allocated memory for each mip.
    void DoFreeNewMips(const FContext& Context);
 
    // Lock each streamed mips into MipData.
    void DoLockNewMips(const FContext& Context);
    // Unlock each streamed mips from MipData.
    void DoUnlockNewMips(const FContext& Context);
 
    // Copy each shared mip to the intermediate texture.
    void DoCopySharedMips(const FContext& Context);
 
    // Async create the texture to the requested size.
    void DoAsyncCreateWithNewMips(const FContext& Context);
};