Texture3DResource.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
/*=============================================================================
    Texture3DResource.h: Implementation of FTexture3DResource used by streamable UVolumeTexture.
=============================================================================*/
 
#include "CoreMinimal.h"
#include "Rendering/StreamableTextureResource.h"
#include "Containers/ResourceArray.h"
 
class UVolumeTexture;
 
class FVolumeTextureBulkData : public FResourceBulkDataInterface
{
public:
 
    static const uint32 MALLOC_ALIGNMENT = 16;
 
    FVolumeTextureBulkData(int32 InFirstMipIdx)
    : FirstMipIdx(InFirstMipIdx)
    {
        FMemory::Memzero(MipData, sizeof(MipData));
        FMemory::Memzero(MipSize, sizeof(MipSize));
    }
 
    ~FVolumeTextureBulkData()
    { 
        Discard();
    }
 
    const void* GetResourceBulkData() const override
    {
        return MipData[FirstMipIdx];
    }
 
    void* GetResourceBulkData()
    {
        return MipData[FirstMipIdx];
    }
 
    uint32 GetResourceBulkDataSize() const override
    {
 
        return (uint32)MipSize[FirstMipIdx];
    }
 
    void Discard() override final;
    void MergeMips(int32 NumMips);
 
    void** GetMipData() { return MipData; }
    int64* GetMipSize() { return MipSize; }
    int32 GetFirstMipIdx() const { return FirstMipIdx; }
 
protected:
 
    void* MipData[MAX_TEXTURE_MIP_COUNT];
    int64 MipSize[MAX_TEXTURE_MIP_COUNT];
    int32 FirstMipIdx;
};
 
 
class FTexture3DResource : public FStreamableTextureResource
{
public: 
 
    FTexture3DResource(UVolumeTexture* InOwner, const FStreamableRenderResourceState& InState);
 
    FTexture3DResource(UVolumeTexture* InOwner, const FTexture3DResource* InProxiedResource);
 
    // Dynamic cast methods.
    virtual FTexture3DResource* GetTexture3DResource() override { return this; }
    // Dynamic cast methods (const).
    virtual const FTexture3DResource* GetTexture3DResource() const override { return this; }
 
    virtual uint64 GetPlatformMipsSize(uint32 NumMips) const override;
 
    virtual void InitRHI(FRHICommandListBase& RHICmdList) override;
    virtual bool IsProxy() const override { return ProxiedResource != nullptr; }
 
private:
 
    void CreateTexture(FRHICommandListBase& RHICmdList) final override;
    void CreatePartiallyResidentTexture(FRHICommandListBase& RHICmdList) final override;
 
    const FTexture3DResource* const ProxiedResource = nullptr;
 
protected:
    FVolumeTextureBulkData InitialData;
 
};