VirtualTextureLevelRedirector.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "VirtualTexturing.h"
 
class FVirtualTextureLevelRedirector : public IVirtualTexture
{
public:
    FVirtualTextureLevelRedirector(IVirtualTexture* InVirtualTexture0, IVirtualTexture* InVirtualTexture1, int32 InTransitionLevel);
    virtual ~FVirtualTextureLevelRedirector();
 
    //~ Begin IVirtualTexture Interface.
    virtual bool IsPageStreamed(uint8 vLevel, uint32 vAddress) const override;
 
    virtual FVTRequestPageResult RequestPageData(
        FRHICommandListBase& RHICmdList,
        const FVirtualTextureProducerHandle& ProducerHandle,
        uint8 LayerMask,
        uint8 vLevel,
        uint64 vAddress,
        EVTRequestPagePriority Priority
    ) override;
 
    virtual IVirtualTextureFinalizer* ProducePageData(
        FRHICommandListBase& RHICmdList,
        ERHIFeatureLevel::Type FeatureLevel,
        EVTProducePageFlags Flags,
        const FVirtualTextureProducerHandle& ProducerHandle,
        uint8 LayerMask,
        uint8 vLevel,
        uint64 vAddress,
        uint64 RequestHandle,
        const FVTProduceTargetLayer* TargetLayers
    ) override;
 
    virtual void GatherProducePageDataTasks(
        FVirtualTextureProducerHandle const& ProducerHandle, 
        FGraphEventArray& InOutTasks
    ) const override;
 
    virtual void GatherProducePageDataTasks(
        uint64 RequestHandle, 
        FGraphEventArray& InOutTasks
    ) const override;
    //~ End IVirtualTexture Interface.
 
private:
    IVirtualTexture* VirtualTextures[2];
    int32 TransitionLevel;
};