TextureCollection.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Engine/DataAsset.h"
#include "RenderResource.h"
#include "TextureCollection.generated.h"
 
class FTextureResource;
class UTexture;
class UTextureCollection;
 
struct FTextureCollectionResource : public FRenderResource
{
    FTextureCollectionResource(UTextureCollection* InParent);
 
    bool bIsBindless = false;
    
    FName CollectionName;
};
 
struct FBindlessTextureCollectionResource : public FTextureCollectionResource
{
    FBindlessTextureCollectionResource(UTextureCollection* InParent);
    virtual ~FBindlessTextureCollectionResource() override = default;
 
    // FRenderResource Interface
    virtual void InitRHI(FRHICommandListBase& RHICmdList) final;
    virtual void ReleaseRHI() final;
    // ~FRenderResource
 
    FRHIResourceCollection* GetResourceCollectionRHI() const
    {
        check(ResourceCollectionRHI);
        return ResourceCollectionRHI.GetReference();
    }
    
private:
    TArray<FTextureResource*> InputTextureResources;
    FRHIResourceCollectionRef ResourceCollectionRHI;
};
 
UCLASS(MinimalAPI, Experimental)
class UTextureCollection : public UDataAsset
{
    GENERATED_BODY()
 
public:
    UPROPERTY(EditAnywhere, Category=TextureCollection)
    TArray<TObjectPtr<UTexture>> Textures;
 
    //~ Begin UObject Interface.
#if WITH_EDITOR
    virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
#endif // WITH_EDITOR
    virtual void PostLoad() override;
    //~ End UObject Interface.
 
    ENGINE_API void SetResource(FTextureCollectionResource* InResource);
    ENGINE_API FTextureCollectionResource* GetResource() const;
    ENGINE_API FTextureCollectionResource* GetResource();
 
    virtual ENGINE_API FTextureCollectionResource* CreateResource();
    ENGINE_API void ReleaseResource();
    ENGINE_API void UpdateResource();
 
    virtual bool IsVirtualCollection() const { return false; }
    
protected:
#if WITH_EDITOR
    void NotifyMaterials();
#endif
 
    FTextureCollectionResource* PrivateResource = nullptr;
    FTextureCollectionResource* PrivateResourceRenderThread = nullptr;
};