SlateUTextureResource.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Misc/App.h"
#include "Textures/SlateShaderResource.h"
#include "TextureResource.h"
#include "Engine/Texture.h"
 
class FSlateBaseUTextureResource : public FSlateShaderResource
{
public:
    FSlateBaseUTextureResource(UTexture* InTexture);
    virtual ~FSlateBaseUTextureResource();
 
    virtual uint32 GetWidth() const;
    virtual uint32 GetHeight() const;
    virtual ESlateShaderResource::Type GetType() const;
    virtual ESlatePostRT GetUsedSlatePostBuffers() const override;
    virtual bool RequiresVirtualTextureFeedback() const override;
 
    FTextureRHIRef AccessRHIResource()
    {
        if ( TextureObject && TextureObject->GetResource())
        {
            FTexture* TextureResource = TextureObject->GetResource();
            TextureResource->LastRenderTime = FApp::GetCurrentTime();
 
            return TextureResource->TextureRHI;
        }
 
        return FTextureRHIRef();
    }
 
    UTexture* GetTextureObject() const { return TextureObject; }
 
 
#if SLATE_CHECK_UOBJECT_RENDER_RESOURCES
    virtual void CheckForStaleResources() const override;
#endif
 
protected:
#if SLATE_CHECK_UOBJECT_RENDER_RESOURCES
    void UpdateDebugName();
#endif
 
    UTexture* TextureObject;
 
#if SLATE_CHECK_UOBJECT_RENDER_RESOURCES
    // Used to guard against crashes when the material object is deleted.  This is expensive so we do not do it in shipping
    TWeakObjectPtr<UTexture> ObjectWeakPtr;
    FName DebugName;
#endif
 
    ESlatePostRT CachedSlatePostBuffers;
    bool CachedIsVirtualTexture;
};
 
 
class FSlateUTextureResource : public FSlateBaseUTextureResource
{
public:
    static TSharedPtr<FSlateUTextureResource> NullResource;
 
    FSlateUTextureResource(UTexture* InTexture);
    virtual ~FSlateUTextureResource();
 
    void UpdateTexture(UTexture* InTexture);
    void ResetTexture();
public:
    FSlateShaderResourceProxy* Proxy;
};