LaunchEngineLoop.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
 
#if WITH_ENGINE
    #include "UnrealEngine.h"
#endif
 
class FEngineService;
class FTraceService;
class FPendingCleanupObjects;
class ISessionService;
class FSlateRenderer;
 
struct FScopedSlowTask;
 
struct FPreInitContext
{
    bool bDumpEarlyConfigReads = false;
    bool bDumpEarlyPakFileReads = false;
    bool bForceQuitAfterEarlyReads = false;
    bool bWithConfigPatching = false;
    UE_DEPRECATED(5.5, "Use gc.MaxObjectsNotConsideredByGC=0 ini setting instead")
    bool bDisableDisregardForGC = false;
    bool bHasEditorToken = false;
    bool bIsRegularClient = false;
    UE_DEPRECATED(5.1, "Use bIsPossiblyUnrecognizedCommandlet instead")
    bool bTokenDoesNotHaveDash = false;
    bool bIsPossiblyUnrecognizedCommandlet = false;
 
    FString Token;
    FString CommandletCommandLine;
 
    FScopedSlowTask* SlowTaskPtr = nullptr;
 
    void Cleanup();
 
#if WITH_ENGINE && !UE_SERVER
    TSharedPtr<FSlateRenderer> SlateRenderer;
#endif // WITH_ENGINE && !UE_SERVER
};
 
class FEngineLoop
#if WITH_ENGINE
    : public IEngineLoop
#endif
{
public:
 
    FEngineLoop();
 
    virtual ~FEngineLoop() { }
 
public:
 
    int32 PreInit(int32 ArgC, TCHAR* ArgV[], const TCHAR* AdditionalCommandline = nullptr);
 
    int32 PreInit(const TCHAR* CmdLine);
    
    int32 PreInitPreStartupScreen(const TCHAR* CmdLine);
 
    int32 PreInitPostStartupScreen(const TCHAR* CmdLine);
 
    void LoadPreInitModules();
 
    bool LoadCoreModules();
 
    void OverrideProjectModule(const FString& InOriginalProjectModuleName, const FString& InReplacementProjectModuleName);
 
    void CleanupPreInitContext();
 
#if WITH_ENGINE
    
    bool LoadStartupCoreModules();
    
    bool LoadStartupModules();
 
    virtual int32 Init() override;
 
    void InitTime();
 
    void Exit();
 
    bool ShouldUseIdleMode() const;
 
    virtual void Tick() override;
 
    virtual void ClearPendingCleanupObjects() override;
 
#endif // WITH_ENGINE
 
    static void PostInitRHI();
 
    static void PreInitHMDDevice();
 
public:
 
    static bool AppInit();
 
    static void AppPreExit();
 
    static void AppExit();
 
private:
 
    void ProcessLocalPlayerSlateOperations() const;
 
protected:
 
    TArray<float> FrameTimes;
 
    double TotalTickTime;
    
    double MaxTickTime;
    
    uint64 MaxFrameCounter;
    
    uint32 LastFrameCycles;
 
#if WITH_ENGINE
 
    FPendingCleanupObjects* PendingCleanupObjects;
 
#endif //WITH_ENGINE
 
private:
 
 
#if WITH_ENGINE
 
    FEngineService* EngineService;
 
    FTraceService* TraceService;
 
    TSharedPtr<ISessionService> SessionService;
 
#endif // WITH_ENGINE
    FPreInitContext PreInitContext;
};
 
 
extern FEngineLoop GEngineLoop;