PreLoadSlateThreading.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
 
#include "HAL/Runnable.h"
#include "Misc/ScopeLock.h"
#include "HAL/PlatformApplicationMisc.h"
 
#include "RHI.h"
#include "RHIResources.h"
 
class FEvent;
class FRunnableThread;
class FHittestGrid;
class FSlateRenderer;
class SVirtualWindow;
class SWindow;
 
class  FPreLoadScreenSlateThreadTask : public FRunnable
{
public:
    FPreLoadScreenSlateThreadTask(class FPreLoadScreenSlateSynchMechanism& InSyncMechanism)
        : SyncMechanism(&InSyncMechanism)
    {
    }
 
    //~ Begin FRunnable interface
    virtual bool Init() override;
    virtual uint32 Run() override;
    virtual void Exit() override;
    //~ End FRunnable interface
 
private:
    class FPreLoadScreenSlateSynchMechanism* SyncMechanism;
};
 
class FPreLoadSlateWidgetRenderer
{
public:
    PRELOADSCREEN_API FPreLoadSlateWidgetRenderer(TSharedPtr<SWindow> InMainWindow, TSharedPtr<SVirtualWindow> InVirtualRenderWindowWindow, FSlateRenderer* InRenderer);
 
    PRELOADSCREEN_API void DrawWindow(float DeltaTime);
 
    SWindow* GetMainWindow_GameThread() const { return MainWindow; }
 
private:
    SWindow* MainWindow;
 
    TSharedRef<SVirtualWindow> VirtualRenderWindow;
 
    TSharedPtr<FHittestGrid> HittestGrid;
 
    FSlateRenderer* SlateRenderer;
 
    FViewportRHIRef ViewportRHI;
};
 
 
class FPreLoadScreenSlateSynchMechanism
{
public:
    PRELOADSCREEN_API FPreLoadScreenSlateSynchMechanism(TSharedPtr<FPreLoadSlateWidgetRenderer, ESPMode::ThreadSafe> InWidgetRenderer);
    PRELOADSCREEN_API ~FPreLoadScreenSlateSynchMechanism();
 
    FPreLoadScreenSlateSynchMechanism() = delete;
    FPreLoadScreenSlateSynchMechanism(const FPreLoadScreenSlateSynchMechanism&) = delete;
    FPreLoadScreenSlateSynchMechanism& operator=(const FPreLoadScreenSlateSynchMechanism&) = delete;
 
    PRELOADSCREEN_API void Initialize();
 
    PRELOADSCREEN_API void DestroySlateThread();
 
    PRELOADSCREEN_API bool IsSlateMainLoopRunning_AnyThread() const;
 
private:
    PRELOADSCREEN_API void HandleWindowBeingDestroyed(const SWindow& WindowBeingDestroyed);
 
    PRELOADSCREEN_API void RunMainLoop_SlateThread();
 
    TAtomic<bool> bIsRunningSlateMainLoop;
 
    static PRELOADSCREEN_API TAtomic<int32> LoadingThreadInstanceCounter;
 
    FRunnableThread* SlateLoadingThread;
    FRunnable* SlateRunnableTask;
    FEvent* SleepEvent;
 
    TSharedPtr<FPreLoadSlateWidgetRenderer, ESPMode::ThreadSafe> WidgetRenderer;
 
    friend FPreLoadScreenSlateThreadTask;
};