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#UE4 Added the initial revision of the slate null renderer. When using -nullrhi, this renderer is used instead of SlateRHIRenderer. #rb Matt.Kuhlenschmidt #codereview Matt.Kuhlenschmidt -------- Integrated using branch Ue4-To-UE4-Fortnite-Simple (reversed) of change#2692587 by Bob.Tellez on 2015/09/15 18:41:09. [CL 2692588 by Bob Tellez in Main branch]
124 lines
3.0 KiB
C++
124 lines
3.0 KiB
C++
// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.
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#include "SlateNullRendererPrivatePCH.h"
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/** A null font texture resource to represent fonts */
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class FSlateFontTextureNull : public FSlateShaderResource
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#if WITH_ENGINE
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, public FTextureResource
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#endif
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{
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public:
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FSlateFontTextureNull() {}
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/** FSlateShaderResource interface */
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virtual uint32 GetWidth() const override { return 0; }
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virtual uint32 GetHeight() const override { return 0; }
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virtual ESlateShaderResource::Type GetType() const override
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{
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return ESlateShaderResource::NativeTexture;
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}
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#if WITH_ENGINE
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/** FTextureResource interface */
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virtual uint32 GetSizeX() const override { return 0; }
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virtual uint32 GetSizeY() const override { return 0; }
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virtual FString GetFriendlyName() const override { return TEXT("FSlateFontTextureNull"); }
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#endif
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};
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/** A null font atlas store null font textures */
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class FSlateFontAtlasNull : public FSlateFontAtlas
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{
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public:
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FSlateFontAtlasNull(float AtlasSize)
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: FSlateFontAtlas(AtlasSize, AtlasSize)
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{}
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virtual class FSlateShaderResource* GetSlateTexture() override { return &NullFontTexture; }
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virtual class FTextureResource* GetEngineTexture() override
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{
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#if WITH_ENGINE
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return &NullFontTexture;
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#else
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return nullptr;
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#endif
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}
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virtual void ConditionalUpdateTexture() override {}
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virtual void ReleaseResources() override {}
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static FSlateFontTextureNull NullFontTexture;
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};
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FSlateFontTextureNull FSlateFontAtlasNull::NullFontTexture;
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/** A null font atlas factory to generate a null font atlas */
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class FSlateNullFontAtlasFactory : public ISlateFontAtlasFactory
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{
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public:
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FSlateNullFontAtlasFactory()
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: AtlasSize(2048)
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{}
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virtual ~FSlateNullFontAtlasFactory() {}
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virtual FIntPoint GetAtlasSize() const override
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{
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return FIntPoint(AtlasSize, AtlasSize);
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}
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virtual TSharedRef<FSlateFontAtlas> CreateFontAtlas() const override
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{
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return MakeShareable(new FSlateFontAtlasNull(AtlasSize));
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}
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private:
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/** Size of each font texture, width and height. Only used to return sane numbers */
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int32 AtlasSize;
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};
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/**
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* Implements the Slate Null Renderer module.
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*/
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class FSlateNullRendererModule
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: public ISlateNullRendererModule
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{
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public:
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// ISlateNullRendererModule interface
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virtual TSharedRef<FSlateRenderer> CreateSlateNullRenderer( ) override
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{
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ConditionalCreateResources();
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return MakeShareable( new FSlateNullRenderer(FontCache, FontMeasure) );
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}
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virtual TSharedRef<ISlateFontAtlasFactory> CreateSlateFontAtlasFactory() override
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{
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return MakeShareable( new FSlateNullFontAtlasFactory );
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}
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virtual void StartupModule( ) override { }
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virtual void ShutdownModule( ) override { }
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private:
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void ConditionalCreateResources()
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{
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if (!FontCache.IsValid())
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{
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FontCache = MakeShareable(new FSlateFontCache(MakeShareable(new FSlateNullFontAtlasFactory)));
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}
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if (!FontMeasure.IsValid())
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{
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FontMeasure = FSlateFontMeasure::Create(FontCache.ToSharedRef());
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}
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}
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private:
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TSharedPtr<FSlateFontCache> FontCache;
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TSharedPtr<FSlateFontMeasure> FontMeasure;
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};
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IMPLEMENT_MODULE( FSlateNullRendererModule, SlateNullRenderer )
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