Texture2DResource.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
/*=============================================================================
    Texture2DResource.h: Implementation of FTexture2DResource used by streamable UTexture2D.
=============================================================================*/
 
#include "CoreMinimal.h"
#include "Rendering/StreamableTextureResource.h"
 
class FTexture2DResource : public FStreamableTextureResource
{
public:
    FTexture2DResource(UTexture2D* InOwner, const FStreamableRenderResourceState& InPostInitState);
 
    virtual ~FTexture2DResource();
 
    // Dynamic cast methods.
    virtual FTexture2DResource* GetTexture2DResource() { return this; }
    // Dynamic cast methods (const).
    virtual const FTexture2DResource* GetTexture2DResource() const { return this; }
 
    void CacheSamplerStateInitializer(const UTexture2D* InOwner);
 
    virtual uint64 GetPlatformMipsSize(uint32 NumMips) const override;
 
    virtual void InitRHI(FRHICommandListBase& RHICmdList) override;
    virtual bool IsProxy() const override { return ProxiedResource != nullptr; }
    
    // returns mip size in bytes; fills OutPitch
    static uint32 CalculateTightPackedMipSize(int32 SizeX,int32 SizeY,EPixelFormat PixelFormat,uint32 & OutPitch);
 
    // warn if "Pitch" is not compatible with tight-packed requirement
    static void WarnRequiresTightPackedMip(int32 SizeX,int32 SizeY,EPixelFormat PixelFormat,uint32 Pitch);
 
private:
    FTexture2DResource(UTexture2D* InOwner, const FTexture2DResource* InProxiedResource);
 
    virtual void CreateTexture(FRHICommandListBase& RHICmdList) final override;
    virtual void CreatePartiallyResidentTexture(FRHICommandListBase& RHICmdList) final override;
 
    friend class UTexture2D;
    friend class FTexture2DUpdate;
    friend class FTexture2DMipAllocator_Virtual;
 
    FTexture2DResourceMem* ResourceMem;
 
    const FTexture2DResource* const ProxiedResource = nullptr;
 
    TArray<void*, TInlineAllocator<MAX_TEXTURE_MIP_COUNT> > MipData;
    TArray<int64, TInlineAllocator<MAX_TEXTURE_MIP_COUNT> > MipDataSize;
 
    void GetData( uint32 MipIndex,void* Dest,uint32 DestPitch, uint64 DestSize );
};