RuntimeVirtualTextureProducer.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "VirtualTexturing.h"
#include "VT/RuntimeVirtualTextureEnum.h"
 
enum class ERuntimeVirtualTextureMaterialType : uint8;
class FRHITexture;
class FSceneInterface;
namespace RuntimeVirtualTexture { class FBatchRenderContext; }
 
class FRuntimeVirtualTextureFinalizer : public IVirtualTextureFinalizer
{
public:
    FRuntimeVirtualTextureFinalizer(
        FVTProducerDescription const& InDesc, 
        int32 InRuntimeVirtualTextureId,
        ERuntimeVirtualTextureMaterialType InMaterialType, 
        bool InClearTextures, 
        FSceneInterface* InScene, 
        FTransform const& InUVToWorld,
        FBox const& InWorldBounds,
        FVector4f const& InCustomMaterialData);
 
    virtual ~FRuntimeVirtualTextureFinalizer() {}
 
    struct FTileEntry
    {
        FVTProduceTargetLayer Targets[RuntimeVirtualTexture::MaxTextureLayers];
        uint64 vAddress = 0;
        uint8 vLevel = 0;
    };
 
    bool IsReady();
 
    void AddTile(FTileEntry& Tile);
 
    //~ Begin IVirtualTextureFinalizer Interface.
    virtual void RenderFinalize(FRDGBuilder& GraphBuilder, ISceneRenderer* SceneRenderer) override;
    virtual void Finalize(FRDGBuilder& GraphBuilder) override;
    //~ End IVirtualTextureFinalizer Interface.
 
private:
    const FVTProducerDescription Desc;
    int32 RuntimeVirtualTextureId;
    ERuntimeVirtualTextureMaterialType MaterialType;
    bool bClearTextures;
    FSceneInterface* Scene;
    FTransform UVToWorld;
    FBox WorldBounds;
    FVector4f CustomMaterialData;
    TArray<FTileEntry> Tiles;
    TArray<RuntimeVirtualTexture::FBatchRenderContext const*> Batches;
};
 
class FRuntimeVirtualTextureProducer : public IVirtualTexture
{
public:
    UE_DEPRECATED(5.6, "Use constructor that takes InCustomMaterialData.")
    RENDERER_API FRuntimeVirtualTextureProducer(
        FVTProducerDescription const& InDesc, 
        int32 InRuntimeVirtualTextureId,
        ERuntimeVirtualTextureMaterialType InMaterialType, 
        bool InClearTextures, 
        FSceneInterface* InScene, 
        FTransform const& InUVToWorld,
        FBox const& InWorldBounds);
 
    RENDERER_API FRuntimeVirtualTextureProducer(
        FVTProducerDescription const& InDesc,
        int32 InRuntimeVirtualTextureId,
        ERuntimeVirtualTextureMaterialType InMaterialType,
        bool InClearTextures,
        FSceneInterface* InScene,
        FTransform const& InUVToWorld,
        FBox const& InWorldBounds,
        FVector4f const& InCustomMaterialData);
 
    virtual ~FRuntimeVirtualTextureProducer() {}
 
    //~ Begin IVirtualTexture Interface.
    virtual bool IsPageStreamed(uint8 vLevel, uint32 vAddress) const override
    {
        return false;
    }
 
    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;
    //~ End IVirtualTexture Interface.
 
private:
    FRuntimeVirtualTextureFinalizer Finalizer;
};