ShaderResourceManager.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Styling/SlateBrush.h"
#include "Textures/SlateShaderResource.h"
#include "Textures/SlateTextureData.h"
#include "Textures/TextureAtlas.h"
#include "Types/SlateVector2.h"
 
struct FNewTextureInfo
{
    FSlateTextureDataPtr TextureData;
    bool bShouldAtlas;
    bool bSrgb;
    FNewTextureInfo()
        : bShouldAtlas(true)
        , bSrgb(true)
    {
 
    }
};
 
struct FCompareFNewTextureInfoByTextureSize
{
    inline bool operator()( const FNewTextureInfo& A, const FNewTextureInfo& B ) const
    {
        return (B.TextureData->GetWidth()+B.TextureData->GetHeight()) < (A.TextureData->GetWidth()+A.TextureData->GetHeight());
    }
};
 
 
class FSlateShaderResourceManager
{
public:
    SLATECORE_API FSlateShaderResourceManager();
    SLATECORE_API virtual ~FSlateShaderResourceManager();
 
    virtual FSlateShaderResourceProxy* GetShaderResource(const FSlateBrush& Brush, FVector2f LocalSize, float DrawScale) = 0;
 
    SLATECORE_API virtual FSlateResourceHandle GetResourceHandle(const FSlateBrush& Brush, FVector2f LocalSize, float DrawScale);
    SLATECORE_API virtual FSlateResourceHandle GetResourceHandle(const FSlateBrush& Brush);
 
    virtual FSlateShaderResource* GetFontShaderResource( int32 InTextureAtlasIndex, FSlateShaderResource* FontTextureAtlas, const class UObject* FontMaterial ) { return FontTextureAtlas; }
 
    virtual ISlateAtlasProvider* GetTextureAtlasProvider() = 0;
 
protected:
 
    void ClearTextureMap()
    {
        // delete all allocated textures
        for( TMap<FName,FSlateShaderResourceProxy*>::TIterator It(ResourceMap); It; ++It )
        {
            delete It.Value();
        }
        ResourceMap.Empty();
#if WITH_ATLAS_DEBUGGING
        AtlasDebugData.Empty();
#endif
    }
 
    FString GetResourcePath( const FSlateBrush& InBrush ) const
    {
        // assume the brush name contains the whole path
        return InBrush.GetResourceName().ToString();
    }
 
    TMap<FName,FSlateShaderResourceProxy*> ResourceMap;
 
#if WITH_ATLAS_DEBUGGING
    TMap<const FAtlasedTextureSlot*, FName> AtlasDebugData;
#endif
private:
    // Non-copyable
    SLATECORE_API FSlateShaderResourceManager(const FSlateShaderResourceManager&);
    SLATECORE_API FSlateShaderResourceManager& operator=(const FSlateShaderResourceManager&);
 
};