// Copyright Epic Games, Inc. All Rights Reserved.

#include "LaunchEngineLoop.h"

#include "HAL/PlatformStackWalk.h"
#include "HAL/PlatformOutputDevices.h"
#include "HAL/LowLevelMemTracker.h"
#include "HAL/MallocFrameProfiler.h"
#include "Misc/MessageDialog.h"
#include "Misc/ScopedSlowTask.h"
#include "Misc/QueuedThreadPool.h"
#include "Misc/QueuedThreadPoolWrapper.h"
#include "HAL/FileManager.h"
#include "HAL/PlatformAffinity.h"
#include "Misc/FileHelper.h"
#include "Internationalization/TextLocalizationManagerGlobals.h"
#include "Logging/LogSuppressionInterface.h"
#include "Async/TaskGraphInterfaces.h"
#include "Async/Fundamental/Scheduler.h"
#include "MemPro/MemProProfiler.h"
#include "Misc/TimeGuard.h"
#include "Misc/Paths.h"
#include "Misc/PathViews.h"
#include "Misc/ConfigCacheIni.h"
#include "Misc/CoreMisc.h"
#include "Misc/ConfigUtilities.h"
#include "Misc/OutputDeviceHelper.h"
#include "Misc/OutputDeviceRedirector.h"
#include "Misc/AutomationTest.h"
#include "Misc/CommandLine.h"
#include "Misc/App.h"
#include "Misc/OutputDeviceConsole.h"
#include "Misc/ScopeExit.h"
#include "HAL/PlatformFileManager.h"
#include "HAL/FileManagerGeneric.h"
#include "HAL/ExceptionHandling.h"
#include "HAL/IPlatformFileManagedStorageWrapper.h"
#include "Stats/StatsMallocProfilerProxy.h"
#include "Trace/Trace.inl"
#include "ProfilingDebugging/TraceAuxiliary.h"
#include "ProfilingDebugging/CsvProfiler.h"
#include "ProfilingDebugging/BootProfiling.h"
#if WITH_ENGINE
#include "HAL/PlatformSplash.h"
#endif
#if WITH_APPLICATION_CORE
#include "HAL/PlatformApplicationMisc.h"
#endif
#include "HAL/ThreadManager.h"
#include "ProfilingDebugging/ExternalProfiler.h"
#include "ProfilingDebugging/StallDetector.h"
#include "Containers/StringView.h"
#include "Containers/Ticker.h"

#include "Interfaces/IPluginManager.h"
#include "ProjectDescriptor.h"
#include "Interfaces/IProjectManager.h"
#include "Misc/UProjectInfo.h"
#include "Misc/EngineVersion.h"

#include "Misc/CoreDelegates.h"
#include "Modules/ModuleManager.h"
#include "Runtime/Launch/Resources/Version.h"
#include "Modules/BuildVersion.h"
#include "UObject/DevObjectVersion.h"
#include "HAL/ThreadHeartBeat.h"

#include "Misc/NetworkVersion.h"
#include "Templates/UniquePtr.h"

#include "Compression/OodleDataCompression.h"

#if !(IS_PROGRAM || WITH_EDITOR)
#include "IPlatformFilePak.h"
#endif

#ifndef USE_IO_DISPATCHER
#define USE_IO_DISPATCHER (WITH_ENGINE || WITH_IOSTORE_IN_EDITOR || !(IS_PROGRAM || WITH_EDITOR))
#endif
#if USE_IO_DISPATCHER
#include "IO/IoDispatcher.h"
#endif

#if WITH_COREUOBJECT
	#include "Internationalization/PackageLocalizationManager.h"
	#include "Misc/PackageName.h"
	#include "UObject/UObjectHash.h"
	#include "UObject/Package.h"
	#include "UObject/Linker.h"
	#include "UObject/LinkerLoad.h"
	#include "UObject/PackageResourceManager.h"
	#include "UObject/ReferencerFinder.h"
#endif

#if WITH_EDITOR
	#include "Blueprint/BlueprintSupport.h"
	#include "Styling/AppStyle.h"
	#include "Misc/RemoteConfigIni.h"
	#include "EditorCommandLineUtils.h"
	#include "Input/Reply.h"
	#include "Styling/CoreStyle.h"
	#include "RenderingThread.h"
	#include "Editor/EditorEngine.h"
	#include "UnrealEdMisc.h"
	#include "UnrealEdGlobals.h"
	#include "Editor/UnrealEdEngine.h"
	#include "Settings/EditorExperimentalSettings.h"
	#include "PIEPreviewDeviceProfileSelectorModule.h"
	#include "AssetCompilingManager.h"
	#include "Serialization/BulkDataRegistry.h"
	#include "ShaderCompiler.h"
	#include "Virtualization/VirtualizationSystem.h"

	#if PLATFORM_WINDOWS
		#include "Windows/AllowWindowsPlatformTypes.h"
			#include <objbase.h>
		#include "Windows/HideWindowsPlatformTypes.h"
	#endif
#endif //WITH_EDITOR

#if WITH_ENGINE
	#include "Engine/GameEngine.h"
	#include "UnrealClient.h"
	#include "Engine/LocalPlayer.h"
	#include "GameFramework/PlayerController.h"
	#include "GameFramework/GameUserSettings.h"
	#include "Features/IModularFeatures.h"
	#include "GameFramework/WorldSettings.h"
	#include "SystemSettings.h"
	#include "EngineStats.h"
	#include "EngineGlobals.h"
	#include "AudioThread.h"
#if !UE_BUILD_SHIPPING
	#include "IAutomationControllerModule.h"
#endif // !UE_BUILD_SHIPPING
#if WITH_EDITORONLY_DATA
	#include "DerivedDataBuild.h"
	#include "DerivedDataCache.h"
#endif // WITH_EDITORONLY_DATA
	#include "DerivedDataCacheInterface.h"
	#include "Serialization/DerivedData.h"
	#include "ShaderCompiler.h"
	#include "DistanceFieldAtlas.h"
	#include "MeshCardRepresentation.h"
	#include "GlobalShader.h"
	#include "ShaderCodeLibrary.h"
	#include "Materials/MaterialInterface.h"
	#include "TextureResource.h"
	#include "Engine/Texture2D.h"
	#include "Internationalization/StringTable.h"
	#include "SceneUtils.h"
	#include "ParticleHelper.h"
	#include "PhysicsPublic.h"
	#include "PlatformFeatures.h"
	#include "DeviceProfiles/DeviceProfileManager.h"
	#include "Commandlets/Commandlet.h"
	#include "EngineService.h"
	#include "ContentStreaming.h"
	#include "HighResScreenshot.h"
	#include "Misc/HotReloadInterface.h"
	#include "ISessionServicesModule.h"
	#include "Net/OnlineEngineInterface.h"
	#include "Internationalization/EnginePackageLocalizationCache.h"
	#include "Rendering/SlateRenderer.h"
	#include "Layout/WidgetPath.h"
	#include "Framework/Application/SlateApplication.h"
	#include "IMessagingModule.h"
	#include "Engine/DemoNetDriver.h"
	#include "LongGPUTask.h"
	#include "RenderUtils.h"
	#include "DynamicResolutionState.h"
	#include "EngineModule.h"
	#include "RenderGraphBuilder.h"

#if !UE_SERVER
	#include "AppMediaTimeSource.h"
	#include "IHeadMountedDisplayModule.h"
	#include "IMediaModule.h"
	#include "HeadMountedDisplay.h"
	#include "MRMeshModule.h"
	#include "Interfaces/ISlateRHIRendererModule.h"
	#include "Interfaces/ISlateNullRendererModule.h"
	#include "EngineFontServices.h"
#endif

	#include "MoviePlayer.h"
	#include "MoviePlayerProxy.h"
	#include "PreLoadScreenManager.h"
	#include "InstallBundleManagerInterface.h"

	#include "ShaderCodeLibrary.h"
	#include "ShaderPipelineCache.h"

#if !UE_BUILD_SHIPPING
	#include "STaskGraph.h"
	#include "IProfilerServiceModule.h"
#endif

#if WITH_AUTOMATION_WORKER
	#include "IAutomationWorkerModule.h"
#endif

#if WITH_ODSC
	#include "ODSC/ODSCManager.h"
#endif
#endif  //WITH_ENGINE

#include "Misc/EmbeddedCommunication.h"

#if WITH_ENGINE
	#include "Tests/RHIUnitTests.h"
#endif

class FSlateRenderer;
class SViewport;
class IPlatformFile;
class FExternalProfiler;
class FFeedbackContext;

#if WITH_EDITOR
	#include "FeedbackContextEditor.h"
	static FFeedbackContextEditor UnrealEdWarn;
	#include "AudioEditorModule.h"
#endif	// WITH_EDITOR

#if UE_EDITOR
	#include "DesktopPlatformModule.h"
	#include "TargetReceipt.h"
#endif

#define LOCTEXT_NAMESPACE "LaunchEngineLoop"

#if PLATFORM_WINDOWS
	#include "Windows/AllowWindowsPlatformTypes.h"
	#include <ObjBase.h>
	#include "Windows/HideWindowsPlatformTypes.h"
#endif

#if WITH_ENGINE
	#include "EngineDefines.h"
	#if ENABLE_VISUAL_LOG
		#include "VisualLogger/VisualLogger.h"
	#endif
	#include "FramePro/FrameProProfiler.h"
	#include "ProfilingDebugging/CsvProfiler.h"
	#include "ProfilingDebugging/TracingProfiler.h"
#endif

#if defined(WITH_LAUNCHERCHECK) && WITH_LAUNCHERCHECK
	#include "ILauncherCheckModule.h"
#endif
#include <String/ParseTokens.h>

#if WITH_COREUOBJECT
	#ifndef USE_LOCALIZED_PACKAGE_CACHE
		#define USE_LOCALIZED_PACKAGE_CACHE 1
	#endif
#else
	#define USE_LOCALIZED_PACKAGE_CACHE 0
#endif

#ifndef RHI_COMMAND_LIST_DEBUG_TRACES
	#define RHI_COMMAND_LIST_DEBUG_TRACES 0
#endif

#if WITH_ENGINE
	CSV_DECLARE_CATEGORY_MODULE_EXTERN(CORE_API, Basic);
#endif

#ifndef WITH_CONFIG_PATCHING
#define WITH_CONFIG_PATCHING 0
#endif

#if PLATFORM_IOS || PLATFORM_TVOS
#include "IOS/IOSAppDelegate.h"
#endif

int32 GUseDisregardForGCOnDedicatedServers = 1;
static FAutoConsoleVariableRef CVarUseDisregardForGCOnDedicatedServers(
	TEXT("gc.UseDisregardForGCOnDedicatedServers"),
	GUseDisregardForGCOnDedicatedServers,
	TEXT("If false, DisregardForGC will be disabled for dedicated servers."),
	ECVF_Default
);

static TAutoConsoleVariable<int32> CVarDoAsyncEndOfFrameTasksRandomize(
	TEXT("tick.DoAsyncEndOfFrameTasks.Randomize"),
	0,
	TEXT("Used to add random sleeps to tick.DoAsyncEndOfFrameTasks to shake loose bugs on either thread. Also does random render thread flushes from the game thread.")
	);

static TAutoConsoleVariable<int32> CVarDoAsyncEndOfFrameTasksValidateReplicatedProperties(
	TEXT("tick.DoAsyncEndOfFrameTasks.ValidateReplicatedProperties"),
	0,
	TEXT("If true, validates that replicated properties haven't changed during the Slate tick. Results will not be valid if demo.ClientRecordAsyncEndOfFrame is also enabled.")
	);

static FAutoConsoleTaskPriority CPrio_AsyncEndOfFrameGameTasks(
	TEXT("TaskGraph.TaskPriorities.AsyncEndOfFrameGameTasks"),
	TEXT("Task and thread priority for the experiemntal async end of frame tasks."),
	ENamedThreads::HighThreadPriority,
	ENamedThreads::NormalTaskPriority,
	ENamedThreads::HighTaskPriority
	);

static TAutoConsoleVariable<float> CVarSecondsBeforeEmbeddedAppSleeps(
	TEXT("tick.SecondsBeforeEmbeddedAppSleeps"),
	1,
	TEXT("When built as embedded, how many ticks to perform before sleeping")
);

/** Task that executes concurrently with Slate when tick.DoAsyncEndOfFrameTasks is true. */
class FExecuteConcurrentWithSlateTickTask
{
	TFunction<void()> TickWithSlate;

public:

	FExecuteConcurrentWithSlateTickTask(TFunction<void()> InTickWithSlate, FEvent* InCompleteEvent)
		: TickWithSlate(InTickWithSlate)
		, CompleteEvent(InCompleteEvent)
	{
		check(CompleteEvent);
	}

	static FORCEINLINE TStatId GetStatId()
	{
		RETURN_QUICK_DECLARE_CYCLE_STAT(FExecuteConcurrentWithSlateTickTask, STATGROUP_TaskGraphTasks);
	}

	static FORCEINLINE ENamedThreads::Type GetDesiredThread()
	{
		return CPrio_AsyncEndOfFrameGameTasks.Get();
	}

	static FORCEINLINE ESubsequentsMode::Type GetSubsequentsMode() { return ESubsequentsMode::TrackSubsequents; }

	void DoTask(ENamedThreads::Type CurrentThread, const FGraphEventRef& MyCompletionGraphEvent)
	{
		TickWithSlate();
		CompleteEvent->Trigger();
	}

private:
	FEvent* CompleteEvent;
};

// Pipe output to std output
// This enables UBT to collect the output for it's own use
class FOutputDeviceStdOutput : public FOutputDevice
{
public:
	FOutputDeviceStdOutput()
	{
#if PLATFORM_WINDOWS
		bIsConsoleOutput = IsStdoutAttachedToConsole() && !FParse::Param(FCommandLine::Get(), TEXT("GenericConsoleOutput"));
#endif

		if (FParse::Param(FCommandLine::Get(), TEXT("AllowStdOutLogVerbosity")))
		{
			AllowedLogVerbosity = ELogVerbosity::Log;
		}

		if (FParse::Param(FCommandLine::Get(), TEXT("FullStdOutLogOutput")))
		{
			AllowedLogVerbosity = ELogVerbosity::All;
		}

		if (stdout == nullptr)
		{
			AllowedLogVerbosity = ELogVerbosity::NoLogging;
		}
	}

	virtual bool CanBeUsedOnAnyThread() const override
	{
		return true;
	}

	virtual bool CanBeUsedOnPanicThread() const override
	{
		return true;
	}

	virtual void Serialize( const TCHAR* V, ELogVerbosity::Type Verbosity, const class FName& Category ) override
	{
		if (Verbosity <= AllowedLogVerbosity)
		{
			FString line = FOutputDeviceHelper::FormatLogLine(Verbosity, Category, V, GPrintLogTimes);

#if PLATFORM_WINDOWS
			if (bIsConsoleOutput)
			{
				line.AppendChar(TEXT('\n'));

				WriteConsoleW(GetStdHandle(STD_OUTPUT_HANDLE), *line, line.Len(), NULL, NULL);

				return;
			}

			// fall through to standard printf path
#endif

#if PLATFORM_TCHAR_IS_CHAR16
			printf("%s\n", TCHAR_TO_UTF8(*line));
#elif PLATFORM_USE_LS_SPEC_FOR_WIDECHAR
			// printf prints wchar_t strings just fine with %ls, while mixing printf()/wprintf() is not recommended (see https://stackoverflow.com/questions/8681623/printf-and-wprintf-in-single-c-code)
			printf("%ls\n", *line);
#else
			wprintf(TEXT("%s\n"), *line);
#endif

			fflush(stdout);
		}
	}

private:
	ELogVerbosity::Type AllowedLogVerbosity = ELogVerbosity::Display;
	bool				bIsConsoleOutput = false;

#if PLATFORM_WINDOWS
	static bool IsStdoutAttachedToConsole()
	{
		HANDLE StdoutHandle = GetStdHandle(STD_OUTPUT_HANDLE);
		if (StdoutHandle != INVALID_HANDLE_VALUE)
		{
			DWORD FileType = GetFileType(StdoutHandle);
			if (FileType == FILE_TYPE_CHAR)
			{
				return true;
			}
		}

		return false;
	}
#endif
};


// Exits the game/editor if any of the specified phrases appears in the log output
class FOutputDeviceTestExit : public FOutputDevice
{
	TArray<FString> ExitPhrases;
	FString* FoundExitPhrase = nullptr;
public:
	FOutputDeviceTestExit(TArray<FString>&& InExitPhrases)
		: ExitPhrases(InExitPhrases)
	{
	}
	virtual ~FOutputDeviceTestExit()
	{
	}
	bool RequestExit() { return !IsEngineExitRequested() && FoundExitPhrase; }
	FString RequestExitPhrase() { return FoundExitPhrase ? *FoundExitPhrase : FString(); }
	virtual void Serialize(const TCHAR* V, ELogVerbosity::Type Verbosity, const class FName& Category) override
	{
		if (FoundExitPhrase || IsEngineExitRequested())
		{
			return;
		}

		for (auto& Phrase : ExitPhrases)
		{
			// look for the exit phrase, but ignore the output of the actual commandline string
			if (FCString::Stristr(V, *Phrase) && !FCString::Stristr(V, TEXT("-testexit=")))
			{
				FoundExitPhrase = &Phrase;
				break;
			}
		}
	}
};


#if WITH_APPLICATION_CORE
static TUniquePtr<FOutputDeviceConsole>	GScopedLogConsole;
#endif
static TUniquePtr<FOutputDeviceStdOutput> GScopedStdOut;
static TUniquePtr<FOutputDeviceTestExit> GScopedTestExit;


#if WITH_ENGINE
static void StopRHIThread()
{
#if HAS_GPU_STATS
	FRealtimeGPUProfiler::SafeRelease();
#endif

	// Stop the RHI Thread (using IsRHIThreadRunning() is unreliable since RT may be stopped)
	if (FTaskGraphInterface::IsRunning() && FTaskGraphInterface::Get().IsThreadProcessingTasks(ENamedThreads::RHIThread))
	{
		DECLARE_CYCLE_STAT(TEXT("Wait For RHIThread Finish"), STAT_WaitForRHIThreadFinish, STATGROUP_TaskGraphTasks);
		FGraphEventRef QuitTask = TGraphTask<FReturnGraphTask>::CreateTask(nullptr, ENamedThreads::GameThread).ConstructAndDispatchWhenReady(ENamedThreads::RHIThread);
		FTaskGraphInterface::Get().WaitUntilTaskCompletes(QuitTask, ENamedThreads::GameThread_Local);
	}
}
#endif

/**
 * Initializes std out device and adds it to GLog
 **/
void InitializeStdOutDevice()
{
	// Check if something is trying to initialize std out device twice.
	check(!GScopedStdOut);

	GScopedStdOut = MakeUnique<FOutputDeviceStdOutput>();
	GLog->AddOutputDevice(GScopedStdOut.Get());
}


bool ParseGameProjectFromCommandLine(const TCHAR* InCmdLine, FString& OutProjectFilePath, FString& OutGameName)
{
	const TCHAR *CmdLine = InCmdLine;
	FString FirstCommandLineToken = FParse::Token(CmdLine, 0);

	// trim any whitespace at edges of string - this can happen if the token was quoted with leading or trailing whitespace
	// VC++ tends to do this in its "external tools" config
	FirstCommandLineToken.TrimStartInline();

	//
	OutProjectFilePath = TEXT("");
	OutGameName = TEXT("");

	if ( FirstCommandLineToken.Len() && !FirstCommandLineToken.StartsWith(TEXT("-")) )
	{
		// The first command line argument could be the project file if it exists or the game name if not launching with a project file
		const FString ProjectFilePath = FString(FirstCommandLineToken);
		if ( FPaths::GetExtension(ProjectFilePath) == FProjectDescriptor::GetExtension() )
		{
			OutProjectFilePath = FirstCommandLineToken;
			// Here we derive the game name from the project file
			OutGameName = FPaths::GetBaseFilename(OutProjectFilePath);
			return true;
		}
		else if (FPaths::IsRelative(FirstCommandLineToken) && FPlatformProperties::IsMonolithicBuild() == false)
		{
			// Full game name is assumed to be the first token
			OutGameName = MoveTemp(FirstCommandLineToken);
			// Derive the project path from the game name. All games must have a uproject file, even if they are in the root folder.
			OutProjectFilePath = FPaths::Combine(*FPaths::RootDir(), *OutGameName, *FString(OutGameName + TEXT(".") + FProjectDescriptor::GetExtension()));
			return true;
		}
	}

#if WITH_EDITOR
	if (FEditorCommandLineUtils::ParseGameProjectPath(InCmdLine, OutProjectFilePath, OutGameName))
	{
		return true;
	}
#endif
	return false;
}

#if WITH_EDITOR
bool ReadInstalledProjectPath(FString& OutProjFilePath)
{
	if(FApp::IsInstalled())
	{
		FString ProjFilePath;
		if (FFileHelper::LoadFileToString(ProjFilePath, *(FPaths::RootDir() / TEXT("Engine/Build/InstalledProjectBuild.txt"))))
		{
			ProjFilePath.TrimStartAndEndInline();
			if(ProjFilePath.Len() > 0)
			{
				OutProjFilePath = FPaths::RootDir() / ProjFilePath;
				FPaths::NormalizeFilename(OutProjFilePath);
				return true;
			}
		}
	}
	return false;
}
#endif

bool LaunchSetGameName(const TCHAR *InCmdLine, FString& OutGameProjectFilePathUnnormalized)
{
	if (GIsGameAgnosticExe)
	{
		// Initialize GameName to an empty string. Populate it below.
		FApp::SetProjectName(TEXT(""));

		FString ProjFilePath;
		FString LocalGameName;
		if (ParseGameProjectFromCommandLine(InCmdLine, ProjFilePath, LocalGameName) == true)
		{
			// Only set the game name if this is NOT a program...
			if (FPlatformProperties::IsProgram() == false)
			{
				FApp::SetProjectName(*LocalGameName);
			}
			OutGameProjectFilePathUnnormalized = ProjFilePath;
			FPaths::SetProjectFilePath(ProjFilePath);
		}
#if WITH_EDITOR
		else if(ReadInstalledProjectPath(ProjFilePath))
		{
			// Only set the game name if this is NOT a program...
			if (FPlatformProperties::IsProgram() == false)
			{
				FApp::SetProjectName(*FPaths::GetBaseFilename(ProjFilePath));
			}
			OutGameProjectFilePathUnnormalized = ProjFilePath;
			FPaths::SetProjectFilePath(ProjFilePath);
		}
#endif
#if UE_GAME
		else
		{
			// Try to use the executable name as the game name.
			LocalGameName = FPlatformProcess::ExecutableName();
			int32 FirstCharToRemove = INDEX_NONE;
			if (LocalGameName.FindChar(TCHAR('-'), FirstCharToRemove))
			{
				LocalGameName.LeftInline(FirstCharToRemove, false);
			}
			FApp::SetProjectName(*LocalGameName);

			// Check it's not UnrealGame, otherwise assume a uproject file relative to the game project directory
			if (LocalGameName != TEXT("UnrealGame"))
			{
				ProjFilePath = FPaths::Combine(TEXT(".."), TEXT(".."), TEXT(".."), *LocalGameName, *FString(LocalGameName + TEXT(".") + FProjectDescriptor::GetExtension()));
				OutGameProjectFilePathUnnormalized = ProjFilePath;
				FPaths::SetProjectFilePath(ProjFilePath);
			}
		}
#endif

		static bool bPrinted = false;
		if (!bPrinted)
		{
			bPrinted = true;
			if (FApp::HasProjectName())
			{
				UE_LOG(LogInit, Display, TEXT("Running engine for game: %s"), FApp::GetProjectName());
			}
			else
			{
				if (FPlatformProperties::RequiresCookedData())
				{
					UE_LOG(LogInit, Fatal, TEXT("Non-agnostic games on cooked platforms require a uproject file be specified."));
				}
				else
				{
					UE_LOG(LogInit, Display, TEXT("Running engine without a game"));
				}
			}
		}
	}
	else
	{
		FString ProjFilePath;
		FString LocalGameName;
		if (ParseGameProjectFromCommandLine(InCmdLine, ProjFilePath, LocalGameName) == true)
		{
			if (FPlatformProperties::RequiresCookedData())
			{
				// Non-agnostic exes that require cooked data cannot load projects, so make sure that the LocalGameName is the GameName
				if (LocalGameName != FApp::GetProjectName())
				{
					UE_LOG(LogInit, Fatal, TEXT("Non-agnostic games cannot load projects on cooked platforms - expected [%s], found [%s]"), FApp::GetProjectName(), *LocalGameName);
				}
			}
			// Only set the game name if this is NOT a program...
			if (FPlatformProperties::IsProgram() == false)
			{
				FApp::SetProjectName(*LocalGameName);
			}
			OutGameProjectFilePathUnnormalized = ProjFilePath;
			FPaths::SetProjectFilePath(ProjFilePath);
		}

		// In a non-game agnostic exe, the game name should already be assigned by now.
		if (!FApp::HasProjectName())
		{
			UE_LOG(LogInit, Fatal,TEXT("Could not set game name!"));
		}
	}

	return true;
}

void LaunchFixProjectPathCase()
{
	if (FPaths::IsProjectFilePathSet())
	{
#if PLATFORM_WINDOWS
		// GetFilenameOnDisk on Windows will resolve directory junctions and resolving those here has negative consequences
		// for workflows that use a junction at their root (eg: p4 gets confused about paths and operations fail).
		// There is a way to get a case-accurate path on Windows without resolving directory junctions, but it is slow.
		// We can use it here for this one-off situation without causing all uses of GetFilenameOnDisk to be slower.
		WIN32_FIND_DATAW Data;
		FString ProjectFilePath = FPaths::GetProjectFilePath();
		for (FStringView PendingFix = ProjectFilePath; PendingFix.Len() > 0;)
		{
			const FStringView CurrentPathComponent = FPathViews::GetCleanFilename(PendingFix);

			// Skip over all segments that are either empty or contain relative transforms or start with the volume separator, they should remain as-is
			const bool bIsIgnoredSegment = CurrentPathComponent.IsEmpty() || CurrentPathComponent.Equals(TEXTVIEW(".")) || CurrentPathComponent.Equals(TEXTVIEW("..")) || CurrentPathComponent.EndsWith(TEXT(':'));
			if (!bIsIgnoredSegment)
			{
				// Temporarily null-terminate the current path component for the system call
				TCHAR Terminator = TEXT('\0');
				Swap(ProjectFilePath.GetCharArray()[PendingFix.Len()], Terminator);

				HANDLE Handle = FindFirstFileW(*ProjectFilePath, &Data);
				if (Handle != INVALID_HANDLE_VALUE)
				{
					check(CurrentPathComponent.Equals(Data.cFileName, ESearchCase::IgnoreCase));
					FCString::Strncpy(GetData(ProjectFilePath) + PendingFix.Len() - CurrentPathComponent.Len(), Data.cFileName, CurrentPathComponent.Len() + 1);
					FindClose(Handle);
				}

				Swap(ProjectFilePath.GetCharArray()[PendingFix.Len()], Terminator);
			}

			PendingFix.LeftChopInline(CurrentPathComponent.Len() + 1);
		}
		FPaths::SetProjectFilePath(ProjectFilePath);
#else
		FPaths::SetProjectFilePath(IFileManager::Get().GetFilenameOnDisk(*FPaths::GetProjectFilePath()));
#endif
	}
}

void LaunchFixGameNameCase()
{
#if PLATFORM_DESKTOP && !IS_PROGRAM
	// This is to make sure this function is not misused and is only called when the game name is set
	check(FApp::HasProjectName());

	// correct the case of the game name, if possible (unless we're running a program and the game name is already set)
	if (FPaths::IsProjectFilePathSet())
	{
		const FString GameName(FPaths::GetBaseFilename(FPaths::GetProjectFilePath()));

		const bool bGameNameMatchesProjectCaseSensitive = (FCString::Strcmp(*GameName, FApp::GetProjectName()) == 0);
		if (!bGameNameMatchesProjectCaseSensitive && (FApp::IsProjectNameEmpty() || GIsGameAgnosticExe || (GameName.Len() > 0 && GIsGameAgnosticExe)))
		{
			if (GameName == FApp::GetProjectName()) // case insensitive compare
			{
				FApp::SetProjectName(*GameName);
			}
			else
			{
				const FText Message = FText::Format(
					NSLOCTEXT("Core", "MismatchedGameNames", "The name of the .uproject file ('{0}') must match the name of the project passed in the command line ('{1}')."),
					FText::FromString(*GameName),
					FText::FromString(FApp::GetProjectName()));
				if (!GIsBuildMachine)
				{
					UE_LOG(LogInit, Warning, TEXT("%s"), *Message.ToString());
					FMessageDialog::Open(EAppMsgType::Ok, Message);
				}
				FApp::SetProjectName(TEXT("")); // this disables part of the crash reporter to avoid writing log files to a bogus directory
				if (!GIsBuildMachine)
				{
					exit(1);
				}
				UE_LOG(LogInit, Fatal, TEXT("%s"), *Message.ToString());
			}
		}
	}
#endif	//PLATFORM_DESKTOP
}


static IPlatformFile* ConditionallyCreateFileWrapper(const TCHAR* Name, IPlatformFile* CurrentPlatformFile, const TCHAR* CommandLine, bool* OutFailedToInitialize = nullptr, bool* bOutShouldBeUsed = nullptr )
{
	if (OutFailedToInitialize)
	{
		*OutFailedToInitialize = false;
	}
	if ( bOutShouldBeUsed )
	{
		*bOutShouldBeUsed = false;
	}
	IPlatformFile* WrapperFile = FPlatformFileManager::Get().GetPlatformFile(Name);
	if (WrapperFile != nullptr && WrapperFile->ShouldBeUsed(CurrentPlatformFile, CommandLine))
	{
		if ( bOutShouldBeUsed )
		{
			*bOutShouldBeUsed = true;
		}
		if (WrapperFile->Initialize(CurrentPlatformFile, CommandLine) == false)
		{
			if (OutFailedToInitialize)
			{
				*OutFailedToInitialize = true;
			}
			// Don't delete the platform file. It will be automatically deleted by its module.
			WrapperFile = nullptr;
		}
	}
	else
	{
		// Make sure it won't be used.
		WrapperFile = nullptr;
	}
	return WrapperFile;
}


/**
 * Look for any file overrides on the command line (i.e. network connection file handler)
 */
bool LaunchCheckForFileOverride(const TCHAR* CmdLine, bool& OutFileOverrideFound)
{
	OutFileOverrideFound = false;

	// Get the physical platform file.
	IPlatformFile* CurrentPlatformFile = &FPlatformFileManager::Get().GetPlatformFile();

	// NetworkPlatformFile can be only one of StorageServerClient, StreamingFile or NetworkFile
	// Having a NetworkPlatformFile present prevents creation of Pakfile, CachedReadFile and SandboxFile
	IPlatformFile* NetworkPlatformFile = nullptr;

#if !UE_BUILD_SHIPPING
	if (!NetworkPlatformFile)
	{
		NetworkPlatformFile = ConditionallyCreateFileWrapper(TEXT("StorageServerClient"), CurrentPlatformFile, CmdLine);
		if (NetworkPlatformFile)
		{
			CurrentPlatformFile = NetworkPlatformFile;
			FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
		}
	}

	// Streaming network wrapper (it has a priority over normal network wrapper)
	bool bShouldInitializeNetwork = !NetworkPlatformFile;
	while (bShouldInitializeNetwork)
	{
		bool bShouldUseStreamingFile = false;
		NetworkPlatformFile = ConditionallyCreateFileWrapper(TEXT("StreamingFile"), CurrentPlatformFile, CmdLine, &bShouldInitializeNetwork, &bShouldUseStreamingFile);
		if (NetworkPlatformFile)
		{
			CurrentPlatformFile = NetworkPlatformFile;
			FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
		}

		// if streaming network platform file was tried this loop don't try this one
		// Network file wrapper (only create if the streaming wrapper hasn't been created)
		if (!bShouldUseStreamingFile && !NetworkPlatformFile)
		{
			NetworkPlatformFile = ConditionallyCreateFileWrapper(TEXT("NetworkFile"), CurrentPlatformFile, CmdLine, &bShouldInitializeNetwork);
			if (NetworkPlatformFile)
			{
				CurrentPlatformFile = NetworkPlatformFile;
				FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
			}
		}

		if (bShouldInitializeNetwork)
		{
			FString HostIpString;
			FParse::Value(CmdLine, TEXT("-FileHostIP="), HostIpString);
#if PLATFORM_REQUIRES_FILESERVER
			FPlatformMisc::LowLevelOutputDebugStringf(TEXT("Failed to connect to file server at %s. RETRYING in 5s.\n"), *HostIpString);
			FPlatformProcess::Sleep(5.0f);
			uint32 Result = 2;
#else	//PLATFORM_REQUIRES_FILESERVER
			// note that this can't be localized because it happens before we connect to a filserver - localizing would cause ICU to try to load.... from over the file server connection!
			FString Error = FString::Printf(TEXT("Failed to connect to any of the following file servers:\n\n    %s\n\nWould you like to try again? No will fallback to local disk files, Cancel will quit."), *HostIpString.Replace( TEXT("+"), TEXT("\n    ")));
			uint32 Result = FMessageDialog::Open( EAppMsgType::YesNoCancel, FText::FromString( Error ) );
#endif	//PLATFORM_REQUIRES_FILESERVER

			if (Result == EAppReturnType::No)
			{
				break;
			}
			else if (Result == EAppReturnType::Cancel)
			{
				// Cancel - return a failure, and quit
				return false;
			}
		}
	}
#endif

	if (!NetworkPlatformFile)
	{
		IPlatformFile* PlatformFile = ConditionallyCreateFileWrapper(TEXT("PakFile"), CurrentPlatformFile, CmdLine);
		if (PlatformFile)
		{
			CurrentPlatformFile = PlatformFile;
			FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
		}

		PlatformFile = ConditionallyCreateFileWrapper(TEXT("CachedReadFile"), CurrentPlatformFile, CmdLine);
		if (PlatformFile)
		{
			CurrentPlatformFile = PlatformFile;
			FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
		}

		PlatformFile = ConditionallyCreateFileWrapper(TEXT("SandboxFile"), CurrentPlatformFile, CmdLine);
		if (PlatformFile)
		{
			CurrentPlatformFile = PlatformFile;
			FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
		}
	}

#if !UE_BUILD_SHIPPING
	// Try to create file profiling wrapper
	{
		IPlatformFile* PlatformFile = ConditionallyCreateFileWrapper(TEXT("ProfileFile"), CurrentPlatformFile, CmdLine);
		if (PlatformFile)
		{
			CurrentPlatformFile = PlatformFile;
			FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
		}
	}
	{
		IPlatformFile* PlatformFile = ConditionallyCreateFileWrapper(TEXT("SimpleProfileFile"), CurrentPlatformFile, CmdLine);
		if (PlatformFile)
		{
			CurrentPlatformFile = PlatformFile;
			FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
		}
	}
	// Try and create file timings stats wrapper
	{
		IPlatformFile* PlatformFile = ConditionallyCreateFileWrapper(TEXT("FileReadStats"), CurrentPlatformFile, CmdLine);
		if (PlatformFile)
		{
			CurrentPlatformFile = PlatformFile;
			FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
		}
	}
	// Try and create file open log wrapper (lists the order files are first opened)
	{
		IPlatformFile* PlatformFile = ConditionallyCreateFileWrapper(TEXT("FileOpenLog"), CurrentPlatformFile, CmdLine);
		if (PlatformFile)
		{
			CurrentPlatformFile = PlatformFile;
			FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
		}
	}
#endif	//#if !UE_BUILD_SHIPPING

	// Wrap the above in a file logging singleton if requested
	{
		IPlatformFile* PlatformFile = ConditionallyCreateFileWrapper(TEXT("LogFile"), CurrentPlatformFile, CmdLine);
		if (PlatformFile)
		{
			CurrentPlatformFile = PlatformFile;
			FPlatformFileManager::Get().SetPlatformFile(*CurrentPlatformFile);
		}
	}

	// If our platform file is different than it was when we started, then an override was used
	OutFileOverrideFound = (CurrentPlatformFile != &FPlatformFileManager::Get().GetPlatformFile());

	return true;
}

#if !UE_BUILD_SHIPPING
/**
 * Process command line aliases
 *
 */
void LaunchCheckForCommandLineAliases(const FConfigFile& Config, TArray<FString>& PrevExpansions, bool& bChanged)
{
	bChanged = false;

	if (const FConfigSection* Section = Config.Find(TEXT("CommandLineAliases")))
	{
		TArray<FString> Tokens;
		{
			const TCHAR* Stream = FCommandLine::Get();
			FString NextToken;
			while (FParse::Token(Stream, NextToken, false))
			{
				Tokens.Add(NextToken);
			}
		}

		for (FConfigSection::TConstIterator ConfigIt(*Section); ConfigIt; ++ConfigIt)
		{
			FString Key = FString(TEXT("-")) + ConfigIt.Key().ToString();
			TArray<FString>::TIterator TokenIt(Tokens);
			while (TokenIt)
			{
				if (PrevExpansions.Contains(*TokenIt))
				{
					TokenIt.RemoveCurrent();
					bChanged = true;
					continue;
				}

				if (*TokenIt == Key)
				{
					PrevExpansions.Add(MoveTemp(*TokenIt));
					*TokenIt = ConfigIt.Value().GetValue();
					bChanged = true;
				}

				++TokenIt;
			}
		}

		if (bChanged)
		{
			FString NewCommandLine = FString::Join(Tokens, TEXT(" "));
			FCommandLine::Set(*NewCommandLine);
		}
	}
}

/**
 * Look for command line file
 *
 */
void LaunchCheckForCmdLineFile(TArray<FString>& PrevExpansions, bool& bChanged)
{
	bChanged = false;

	auto RemoveExpansion = [&bChanged]()
	{
		FString NewCommandLine = FCommandLine::Get();
		FString Left;
		FString Right;
		if (NewCommandLine.Split(TEXT("-CmdLineFile="), &Left, &Right))
		{
			FString NextToken;
			const TCHAR* Stream = *Right;
			if (FParse::Token(Stream, NextToken, /*bUseEscape=*/ false))
			{
				Right = FString(Stream);
			}

			NewCommandLine = Left + TEXT(" ") + Right;
			NewCommandLine.TrimStartAndEndInline();
			FCommandLine::Set(*NewCommandLine);
			bChanged = true;
		}
	};

	auto TryProcessFile = [&RemoveExpansion, &bChanged](const FString& InFilePath)
	{
		FString FileCmds;
		if (FFileHelper::LoadFileToString(FileCmds, *InFilePath))
		{
			UE_LOG(LogInit, Log, TEXT("Inserting commandline from file: %s, %s"), *InFilePath, *FileCmds);

			FileCmds = FileCmds.TrimStartAndEnd();
			if (FileCmds.Len() == 0)
			{
				RemoveExpansion();
				return true;
			}

			FString NewCommandLine = FCommandLine::Get();
			FString Left;
			FString Right;
			if (NewCommandLine.Split(TEXT("-CmdLineFile="), &Left, &Right))
			{
				FString NextToken;
				const TCHAR* Stream = *Right;
				if (FParse::Token(Stream, NextToken, /*bUseEscape=*/ false))
				{
					Right = FString(Stream);
				}

				NewCommandLine = Left + TEXT(" ") + FileCmds + TEXT(" ") + Right;
				NewCommandLine.TrimStartAndEndInline();
				FCommandLine::Set(*NewCommandLine);
				bChanged = true;
				return true;
			}
		}

		return false;
	};

	FString CmdLineFile;
	while (FParse::Value(FCommandLine::Get(), TEXT("-CmdLineFile="), CmdLineFile))
	{
		if (!CmdLineFile.EndsWith(TEXT(".txt")))
		{
			UE_LOG(LogInit, Warning, TEXT("Can only load commandline files ending with .txt, can't load: %s"), *CmdLineFile);
			RemoveExpansion();
			continue;
		}

		if (PrevExpansions.Contains(CmdLineFile))
		{
			// If already expanded, just remove it
			RemoveExpansion();
			continue;
		}

		bool bFoundFile = TryProcessFile(CmdLineFile);
		if (!bFoundFile && FPaths::ProjectDir().Len() > 0)
		{
			const FString ProjectDir = FPaths::ProjectDir();
			bFoundFile = TryProcessFile(ProjectDir + CmdLineFile);
			if (!bFoundFile)
			{
				const FString ProjectPluginsDir = ProjectDir + TEXT("Plugins/");
				TArray<FString> DirectoryNames;
				IFileManager::Get().IterateDirectory(*ProjectPluginsDir, [&](const TCHAR* FilenameOrDirectory, bool bIsDirectory) -> bool
				{
					if (bIsDirectory && TryProcessFile(FString(FilenameOrDirectory) + TEXT("/") + CmdLineFile))
					{
						bFoundFile = true;
						return false;
					}
					return true;
				});
			}
		}

		if (!bFoundFile)
		{
			UE_LOG(LogInit, Warning, TEXT("Failed to load commandline file '%s'."), *CmdLineFile);
			RemoveExpansion();
			continue;
		}

		PrevExpansions.Add(MoveTemp(CmdLineFile));
	}
}
#endif

bool LaunchHasIncompleteGameName()
{
	if ( FApp::HasProjectName() && !FPaths::IsProjectFilePathSet() )
	{
		// Verify this is a legitimate game name
		// Launched with a game name. See if the <GameName> folder exists. If it doesn't, it could instead be <GameName>Game
		const FString NonSuffixedGameFolder = FPaths::RootDir() / FApp::GetProjectName();
		if (FPlatformFileManager::Get().GetPlatformFile().DirectoryExists(*NonSuffixedGameFolder) == false)
		{
			const FString SuffixedGameFolder = NonSuffixedGameFolder + TEXT("Game");
			if (FPlatformFileManager::Get().GetPlatformFile().DirectoryExists(*SuffixedGameFolder))
			{
				return true;
			}
		}
	}

	return false;
}


void LaunchUpdateMostRecentProjectFile()
{
	// If we are launching without a game name or project file, we should use the last used project file, if it exists
	const FString& AutoLoadProjectFileName = IProjectManager::Get().GetAutoLoadProjectFileName();
	FString RecentProjectFileContents;
	if ( FFileHelper::LoadFileToString(RecentProjectFileContents, *AutoLoadProjectFileName) )
	{
		if ( RecentProjectFileContents.Len() )
		{
			const FString AutoLoadInProgressFilename = AutoLoadProjectFileName + TEXT(".InProgress");
			if ( FPlatformFileManager::Get().GetPlatformFile().FileExists(*AutoLoadInProgressFilename) )
			{
				// We attempted to auto-load a project but the last run did not make it to UEditorEngine::InitEditor.
				// This indicates that there was a problem loading the project.
				// Do not auto-load the project, instead load normally until the next time the editor starts successfully.
				UE_LOG(LogInit, Display, TEXT("There was a problem auto-loading %s. Auto-load will be disabled until the editor successfully starts up with a project."), *RecentProjectFileContents);
			}
			else if ( FPlatformFileManager::Get().GetPlatformFile().FileExists(*RecentProjectFileContents) )
			{
				// The previously loaded project file was found. Change the game name here and update the project file path
				FApp::SetProjectName(*FPaths::GetBaseFilename(RecentProjectFileContents));
				FPaths::SetProjectFilePath(RecentProjectFileContents);
				UE_LOG(LogInit, Display, TEXT("Loading recent project file: %s"), *RecentProjectFileContents);

				// Write a file indicating that we are trying to auto-load a project.
				// This file prevents auto-loading of projects for as long as it exists. It is a detection system for failed auto-loads.
				// The file is deleted in UEditorEngine::InitEditor, thus if the load does not make it that far then the project will not be loaded again.
				FFileHelper::SaveStringToFile(TEXT(""), *AutoLoadInProgressFilename);
			}
		}
	}
}

#if WITH_ENGINE
void OnStartupContentMounted(FInstallBundleRequestResultInfo Result, bool bDumpEarlyConfigReads, bool bDumpEarlyPakFileReads, bool bReloadConfig, bool bForceQuitAfterEarlyReads);
#endif
void DumpEarlyReads(bool bDumpEarlyConfigReads, bool bDumpEarlyPakFileReads, bool bForceQuitAfterEarlyReads);
void HandleConfigReload(bool bReloadConfig);

#if !UE_BUILD_SHIPPING
class FFileInPakFileHistoryHelper
{
private:
	struct FFileInPakFileHistory
	{
		FString PakFileName;
		FString FileName;
	};
	friend uint32 GetTypeHash(const FFileInPakFileHistory& H)
	{
		uint32 Hash = ::GetTypeHash(H.PakFileName);
		Hash = HashCombine(Hash, ::GetTypeHash(H.FileName));
		return Hash;
	}
	friend bool operator==(const FFileInPakFileHistory& A, const FFileInPakFileHistory& B)
	{
		return A.PakFileName == B.PakFileName && A.FileName == B.FileName;
	}

	TSet<FFileInPakFileHistory> History;
	FCriticalSection HistoryLock;

	void OnFileOpenedForRead(const TCHAR* PakFileName, const TCHAR* FileName)
	{
		//UE_LOG(LogInit, Warning, TEXT("OnFileOpenedForRead %u: %s - %s"), FPlatformTLS::GetCurrentThreadId(), PakFileName, FileName);

		FScopeLock ScopeLock(&HistoryLock);
		History.Emplace(FFileInPakFileHistory{ PakFileName, FileName });
	}

public:
	FFileInPakFileHistoryHelper()
	{
		FCoreDelegates::OnFileOpenedForReadFromPakFile.AddRaw(this, &FFileInPakFileHistoryHelper::OnFileOpenedForRead);
	}

	~FFileInPakFileHistoryHelper()
	{
		FCoreDelegates::OnFileOpenedForReadFromPakFile.RemoveAll(this);
	}

	void DumpHistory()
	{
		FScopeLock ScopeLock(&HistoryLock);

		History.Sort([](const FFileInPakFileHistory& A, const FFileInPakFileHistory& B)
		{
			if (A.PakFileName == B.PakFileName)
			{
				return A.FileName < B.FileName;
			}

			return A.PakFileName < B.PakFileName;
		});

		const FString SavePath = FPaths::ProjectLogDir() / TEXT("FilesLoadedFromPakFiles.csv");

		FArchive* Writer = IFileManager::Get().CreateFileWriter(*SavePath, FILEWRITE_NoFail);

		auto WriteLine = [Writer](FString&& Line)
		{
			UE_LOG(LogInit, Display, TEXT("%s"), *Line);
			FTCHARToUTF8 UTF8String(*(MoveTemp(Line) + LINE_TERMINATOR));
			Writer->Serialize((UTF8CHAR*)UTF8String.Get(), UTF8String.Length());
		};

		UE_LOG(LogInit, Display, TEXT("Dumping History of files read from Paks to %s"), *SavePath);
		UE_LOG(LogInit, Display, TEXT("Begin History of files read from Paks"));
		UE_LOG(LogInit, Display, TEXT("------------------------------------------------------"));
		WriteLine(FString::Printf(TEXT("PakFile, File")));
		for (const FFileInPakFileHistory& H : History)
		{
			WriteLine(FString::Printf(TEXT("%s, %s"), *H.PakFileName, *H.FileName));
		}
		UE_LOG(LogInit, Display, TEXT("------------------------------------------------------"));
		UE_LOG(LogInit, Display, TEXT("End History of files read from Paks"));

		delete Writer;
		Writer = nullptr;
	}
};
TUniquePtr<FFileInPakFileHistoryHelper> FileInPakFileHistoryHelper;
#endif // !UE_BUILD_SHIPPING

void RecordFileReadsFromPaks()
{
#if !UE_BUILD_SHIPPING
	FileInPakFileHistoryHelper = MakeUnique<FFileInPakFileHistoryHelper>();
#endif
}

void DumpRecordedFileReadsFromPaks()
{
#if !UE_BUILD_SHIPPING
	if (FileInPakFileHistoryHelper)
	{
		FileInPakFileHistoryHelper->DumpHistory();
	}
#endif
}

void DeleteRecordedFileReadsFromPaks()
{
#if !UE_BUILD_SHIPPING
	FileInPakFileHistoryHelper = nullptr;
#endif
}



/*-----------------------------------------------------------------------------
	FEngineLoop implementation.
-----------------------------------------------------------------------------*/

FEngineLoop::FEngineLoop()
#if WITH_ENGINE
	: EngineService(nullptr)
#endif
{ }


int32 FEngineLoop::PreInit(int32 ArgC, TCHAR* ArgV[], const TCHAR* AdditionalCommandline)
{
	FString CmdLine = FCommandLine::BuildFromArgV(nullptr, ArgC, ArgV, AdditionalCommandline);

	// send the command line without the exe name
	return GEngineLoop.PreInit(*CmdLine);
}

#if WITH_ENGINE
bool IsServerDelegateForOSS(FName WorldContextHandle)
{
	if (IsRunningDedicatedServer())
	{
		return true;
	}

	UWorld* World = nullptr;
#if WITH_EDITOR
	if (WorldContextHandle != NAME_None)
	{
		const FWorldContext* WorldContext = GEngine->GetWorldContextFromHandle(WorldContextHandle);
		if (WorldContext)
		{
			check(WorldContext->WorldType == EWorldType::Game || WorldContext->WorldType == EWorldType::PIE);
			World = WorldContext->World();
		}		
	}	
#endif

	if (!World)
	{
		UGameEngine* GameEngine = Cast<UGameEngine>(GEngine);
		if (GameEngine)
		{
			World = GameEngine->GetGameWorld();
		}
		else
		{
			// The calling code didn't pass in a world context and really should have
			if (GIsPlayInEditorWorld)
			{
				World = GWorld;
			}

#if !WITH_DEV_AUTOMATION_TESTS
			// Not having a world to make the right determination is a bad thing
			// In the editor during PIE this will confuse the individual PIE windows and their associated online components
			UE_CLOG((World == nullptr), LogInit, Error, TEXT("Failed to determine if OSS is server in PIE, OSS requests will fail"));
#endif
		}
	}

	ENetMode NetMode = World ? World->GetNetMode() : NM_Standalone;
	return (NetMode == NM_ListenServer || NetMode == NM_DedicatedServer);
}
#endif

#if WITH_ENGINE && CSV_PROFILER
static void UpdateCoreCsvStats_BeginFrame()
{
	if (FCsvProfiler::Get()->IsCapturing())
	{
		if (!IsRunningDedicatedServer())
		{
#if PLATFORM_WINDOWS && !UE_BUILD_SHIPPING
		    const uint32 ProcessId = (uint32)GetCurrentProcessId();
		    float ProcessUsageFraction = 0.f, IdleUsageFraction = 0.f;
		    FWindowsPlatformProcess::GetPerFrameProcessorUsage(ProcessId, ProcessUsageFraction, IdleUsageFraction);
    
		    CSV_CUSTOM_STAT_GLOBAL(CPUUsage_Process, ProcessUsageFraction, ECsvCustomStatOp::Set);
		    CSV_CUSTOM_STAT_GLOBAL(CPUUsage_Idle, IdleUsageFraction, ECsvCustomStatOp::Set);
#endif
		}
#if CSV_PROFILER_ALLOW_DEBUG_FEATURES
		// Handle CsvExecCmds for this frame
		if (GEngine && GWorld)
		{
			TArray<FString> FrameCommands;
			FCsvProfiler::Get()->GetFrameExecCommands(FrameCommands);
			for (FString Cmd : FrameCommands)
			{
				CSV_EVENT_GLOBAL(TEXT("CsvExecCommand : %s"), *Cmd);

				// Try to execute on the local player
				bool bExecuted = false;
				for (FConstPlayerControllerIterator Iterator = GWorld->GetPlayerControllerIterator(); Iterator; ++Iterator)
				{
					APlayerController* PlayerController = Iterator->Get();
					if (PlayerController)
					{
						if (ULocalPlayer* LocalPlayer = Cast<ULocalPlayer>(PlayerController->Player))
						{
							LocalPlayer->Exec(GWorld, *Cmd, *GLog);
							bExecuted = true;
						}
					}
				}
				if (!bExecuted)
				{
					// Fallback to GEngine exec
					GEngine->Exec(GWorld, *Cmd);
				}
			}
		}
#endif // CSV_PROFILER_ALLOW_DEBUG_FEATURES
	}
}

static void UpdateCoreCsvStats_EndFrame()
{
	if (!IsRunningDedicatedServer())
	{
	    CSV_CUSTOM_STAT_GLOBAL(RenderThreadTime, FPlatformTime::ToMilliseconds(GRenderThreadTime), ECsvCustomStatOp::Set);
	    CSV_CUSTOM_STAT_GLOBAL(GameThreadTime, FPlatformTime::ToMilliseconds(GGameThreadTime), ECsvCustomStatOp::Set);
	    CSV_CUSTOM_STAT_GLOBAL(GPUTime, FPlatformTime::ToMilliseconds(GGPUFrameTime), ECsvCustomStatOp::Set);
	    if (IsRunningRHIInSeparateThread())
	    {
		    CSV_CUSTOM_STAT_GLOBAL(RHIThreadTime, FPlatformTime::ToMilliseconds(GRHIThreadTime), ECsvCustomStatOp::Set);
	    }
	    if (GInputLatencyTime > 0)
	    {
		    CSV_CUSTOM_STAT_GLOBAL(InputLatencyTime, FPlatformTime::ToMilliseconds64(GInputLatencyTime), ECsvCustomStatOp::Set);
	    }
	    FPlatformMemoryStats MemoryStats = FPlatformMemory::GetStats();
	    float PhysicalMBFree = float(MemoryStats.AvailablePhysical / 1024) / 1024.0f;
#if !UE_BUILD_SHIPPING
	    // Subtract any extra development memory from physical free. This can result in negative values in cases where we would have crashed OOM
	    PhysicalMBFree -= float(FPlatformMemory::GetExtraDevelopmentMemorySize() / 1024ull / 1024ull);
#endif
	    CSV_CUSTOM_STAT_GLOBAL(MemoryFreeMB, PhysicalMBFree, ECsvCustomStatOp::Set);

#if !UE_BUILD_SHIPPING
	    float TargetFPS = 30.0f;
	    static IConsoleVariable* MaxFPSCVar = IConsoleManager::Get().FindConsoleVariable(TEXT("t.MaxFPS"));
	    if (MaxFPSCVar && MaxFPSCVar->GetFloat() > 0)
	    {
		    TargetFPS = MaxFPSCVar->GetFloat();
	    }
	    CSV_CUSTOM_STAT_GLOBAL(MaxFrameTime, 1000.0f / TargetFPS, ECsvCustomStatOp::Set);
#endif
	}
}
#endif // WITH_ENGINE && CSV_PROFILER

#if WITH_ENGINE
namespace AppLifetimeEventCapture
{
	static void AppWillDeactivate()
	{
		UE_LOG( LogCore, Display, TEXT("AppLifetime: Application will deactivate") );
		CSV_EVENT_GLOBAL(TEXT("App_WillDeactivate"));
	}

	static void AppHasReactivated()
	{
		UE_LOG( LogCore, Display, TEXT("AppLifetime: Application has reactivated") );
		CSV_EVENT_GLOBAL(TEXT("App_HasReactivated"));
	}

	static void AppWillEnterBackground()
	{
		UE_LOG( LogCore, Display, TEXT("AppLifetime: Application will enter background") );
		CSV_EVENT_GLOBAL(TEXT("App_WillEnterBackground"));
	}

	static void AppHasEnteredForeground()
	{
		UE_LOG( LogCore, Display, TEXT("AppLifetime: Application has entered foreground") );
		CSV_EVENT_GLOBAL(TEXT("App_HasEnteredForeground"));
	}

	static void Init()
	{
		FCoreDelegates::ApplicationWillDeactivateDelegate.AddStatic(AppWillDeactivate);
		FCoreDelegates::ApplicationHasReactivatedDelegate.AddStatic(AppHasReactivated);
		FCoreDelegates::ApplicationWillEnterBackgroundDelegate.AddStatic(AppWillEnterBackground);
		FCoreDelegates::ApplicationHasEnteredForegroundDelegate.AddStatic(AppHasEnteredForeground);
	}
}
#endif //WITH_ENGINE

static void UpdateGInputTime()
{
	GInputTime = FPlatformTime::Cycles64();
}

#if WITH_EDITOR
static void ShaderAutogenInit()
{
	// Force generation of the autogen files for the host platform
	FShaderCompileUtilities::GenerateBrdfHeaders(GMaxRHIShaderPlatform);

	// also do this for all active target platforms (e.g. when cooking)
	ITargetPlatformManagerModule* TPM = GetTargetPlatformManager();
	if (TPM)
	{
		const TArray<ITargetPlatform*>& Platforms = TPM->GetActiveTargetPlatforms();

		for (int32 Index = 0; Index < Platforms.Num(); ++Index)
		{
			TArray<FName> DesiredShaderFormats;
			checkf(Platforms[Index], TEXT("Null platform on the list of active platforms!"));
			Platforms[Index]->GetAllTargetedShaderFormats(DesiredShaderFormats);

			for (int32 FormatIndex = 0; FormatIndex < DesiredShaderFormats.Num(); ++FormatIndex)
			{
				FShaderCompileUtilities::GenerateBrdfHeaders(DesiredShaderFormats[FormatIndex]);
			}
		}
	}

	// also do this for the editor mobile preview
	EShaderPlatform MobilePreviewShaderPlatform = GShaderPlatformForFeatureLevel[ERHIFeatureLevel::ES3_1];
	if (MobilePreviewShaderPlatform != SP_NumPlatforms)
	{
		FShaderCompileUtilities::GenerateBrdfHeaders(MobilePreviewShaderPlatform);
	}
}
#endif // WITH_EDITOR

DECLARE_CYCLE_STAT(TEXT("FEngineLoop::PreInitPreStartupScreen.AfterStats"), STAT_FEngineLoop_PreInitPreStartupScreen_AfterStats, STATGROUP_LoadTime);
DECLARE_CYCLE_STAT(TEXT("FEngineLoop::PreInitPostStartupScreen.AfterStats"), STAT_FEngineLoop_PreInitPostStartupScreen_AfterStats, STATGROUP_LoadTime);

int32 FEngineLoop::PreInitPreStartupScreen(const TCHAR* CmdLine)
{
	ON_SCOPE_EXIT { GEnginePreInitPreStartupScreenEndTime = FPlatformTime::Seconds(); };
	FDelayedAutoRegisterHelper::RunAndClearDelayedAutoRegisterDelegates(EDelayedRegisterRunPhase::StartOfEnginePreInit);
	SCOPED_BOOT_TIMING("FEngineLoop::PreInitPreStartupScreen");

	// GLog is initialized lazily and its default master thread is the thread that initialized it.
	// This lazy initialization can happen during initialization of a DLL, which Windows does on a
	// worker thread, which makes that worker thread the master thread. Make this the master thread
	// until initialization is far enough along to try to start a dedicated master thread.
	if (GLog)
	{
		GLog->SetCurrentThreadAsMasterThread();
	}

	// Command line option for enabling named events
	if (FParse::Param(CmdLine, TEXT("statnamedevents")))
	{
		++GCycleStatsShouldEmitNamedEvents;
	}
	
	if (FParse::Param(CmdLine, TEXT("verbosenamedevents")))
	{
		++GCycleStatsShouldEmitNamedEvents;
		GShouldEmitVerboseNamedEvents = true;
	}

	// Set the flag for whether we've build DebugGame instead of Development. The engine does not know this (whereas the launch module does) because it is always built in development.
#if UE_BUILD_DEVELOPMENT && defined(UE_BUILD_DEVELOPMENT_WITH_DEBUGGAME) && UE_BUILD_DEVELOPMENT_WITH_DEBUGGAME
	FApp::SetDebugGame(true);
#endif

#if PLATFORM_WINDOWS
	// Register a handler for Ctrl-C so we've effective signal handling from the outset.
	FWindowsPlatformMisc::SetGracefulTerminationHandler();
#endif // PLATFORM_WINDOWS

#if BUILD_EMBEDDED_APP
#ifdef EMBEDDED_LINKER_GAME_HELPER_FUNCTION
	extern void EMBEDDED_LINKER_GAME_HELPER_FUNCTION();
	EMBEDDED_LINKER_GAME_HELPER_FUNCTION();
#endif
	FEmbeddedCommunication::Init();
	FEmbeddedCommunication::KeepAwake(TEXT("Startup"), false);
#endif

	FMemory::SetupTLSCachesOnCurrentThread();

	if (FParse::Param(CmdLine, TEXT("UTF8Output")))
	{
		FPlatformMisc::SetUTF8Output();
	}

#if !UE_BUILD_SHIPPING
	if (FParse::Param(CmdLine, TEXT("IgnoreDebugger")))
	{
		GIgnoreDebugger = true;
	}
#endif // !UE_BUILD_SHIPPING

	// Switch into executable's directory.
	FPlatformProcess::SetCurrentWorkingDirectoryToBaseDir();

	// this is set later with shorter command lines, but we want to make sure it is set ASAP as some subsystems will do the tests themselves...
	// also realize that command lines can be pulled from the network at a slightly later time.
	if (!FCommandLine::Set(CmdLine))
	{
		// Fail, shipping builds will crash if setting command line fails
		return -1;
	}

	// Avoiding potential exploits by not exposing command line overrides in the shipping games.
#if !UE_BUILD_SHIPPING && WITH_EDITORONLY_DATA
	// Retrieve additional command line arguments from environment variable.
	FString Env = FPlatformMisc::GetEnvironmentVariable(TEXT("UE-CmdLineArgs")).TrimStart();
	if (Env.Len())
	{
		// Append the command line environment after inserting a space as we can't set it in the
		// environment.
		FCommandLine::Append(TEXT(" -EnvAfterHere "));
		FCommandLine::Append(*Env);
		CmdLine = FCommandLine::Get();
	}
#endif

	// Name of project file before normalization (as specified in command line).
	// Used to fixup project name if necessary.
	FString GameProjectFilePathUnnormalized;

	{
		SCOPED_BOOT_TIMING("LaunchSetGameName");

		// Set GameName, based on the command line
		if (LaunchSetGameName(CmdLine, GameProjectFilePathUnnormalized) == false)
		{
			// If it failed, do not continue
			return 1;
		}
	}
	
	// Initialize trace
	FTraceAuxiliary::Initialize(CmdLine);
	FTraceAuxiliary::TryAutoConnect();

	// disable/enable LLM based on commandline
	{
		SCOPED_BOOT_TIMING("LLM Init");
		LLM(FLowLevelMemTracker::Get().ProcessCommandLine(CmdLine));
#if MEMPRO_ENABLED
		FMemProProfiler::Init(CmdLine);
#endif
	}
	LLM_SCOPE(ELLMTag::EnginePreInitMemory);

	{
		SCOPED_BOOT_TIMING("InitTaggedStorage");
		FPlatformMisc::InitTaggedStorage(1024);
	}

#if WITH_ENGINE
	FCoreUObjectDelegates::PostGarbageCollectConditionalBeginDestroy.AddStatic(DeferredPhysResourceCleanup);
#endif
	FCoreDelegates::OnSamplingInput.AddStatic(UpdateGInputTime);

#if defined(WITH_LAUNCHERCHECK) && WITH_LAUNCHERCHECK
	if (ILauncherCheckModule::Get().WasRanFromLauncher() == false)
	{
		// Tell Launcher to run us instead
		ILauncherCheckModule::Get().RunLauncher(ELauncherAction::AppLaunch);
		// We wish to exit
		RequestEngineExit(TEXT("Run outside of launcher; restarting via launcher"));
		return 1;
	}
#endif

#if	STATS
	// Create the stats malloc profiler proxy.
	if (FStatsMallocProfilerProxy::HasMemoryProfilerToken())
	{
		if (PLATFORM_USES_FIXED_GMalloc_CLASS)
		{
			UE_LOG(LogMemory, Fatal, TEXT("Cannot do malloc profiling with PLATFORM_USES_FIXED_GMalloc_CLASS."));
		}
		// Assumes no concurrency here.
		GMalloc = FStatsMallocProfilerProxy::Get();
	}
#endif // STATS

#if WITH_APPLICATION_CORE
	{
		SCOPED_BOOT_TIMING("CreateConsoleOutputDevice");
		// Initialize log console here to avoid statics initialization issues when launched from the command line.
		GScopedLogConsole = TUniquePtr<FOutputDeviceConsole>(FPlatformApplicationMisc::CreateConsoleOutputDevice());
	}
#endif

	// Always enable the backlog so we get all messages, we will disable and clear it in the game
	// as soon as we determine whether GIsEditor == false
	GLog->EnableBacklog(true);

	// Try to start the dedicated master thread now that the command line is available.
	if (!FParse::Param(FCommandLine::Get(), TEXT("NoLogThread")))
	{
		GLog->TryStartDedicatedMasterThread();
	}

	// Initialize std out device as early as possible if requested in the command line
#if PLATFORM_DESKTOP
	// consoles don't typically have stdout, and FOutputDeviceDebug is responsible for echoing logs to the
	// terminal
	if (FParse::Param(FCommandLine::Get(), TEXT("stdout")))
	{
		InitializeStdOutDevice();
	}
#endif

// If we are in Debug, Development, or Test/Shipping with ALLOW_PROFILEGPU... enabled, then automatically allow draw events.
// Command lines allow disabling of draw events if WITH_PROGILEGPU is enabled. Test/Shipping on their own require explicit opt in.
#if WITH_PROFILEGPU	
	if (!FParse::Param(FCommandLine::Get(), TEXT("nodrawevents")))
	{
		SetEmitDrawEvents(true);
	}
// Continue to protect shipping build from emitdrawevents (if needed in shipping, ALLOW_PROFILEGPU_IN_SHIPPING should be used instead to enable WITH_PROFILEGPU)
#elif !UE_BUILD_SHIPPING
	if (FParse::Param(FCommandLine::Get(), TEXT("emitdrawevents")))
	{
		SetEmitDrawEvents(true);
	}
#endif

#if !UE_BUILD_SHIPPING
	if (FPlatformProperties::SupportsQuit())
	{
		FString ExitPhrases;
		if (FParse::Value(FCommandLine::Get(), TEXT("testexit="), ExitPhrases))
		{
			TArray<FString> ExitPhrasesList;
			if (ExitPhrases.ParseIntoArray(ExitPhrasesList, TEXT("+"), true) > 0)
			{
				GScopedTestExit = MakeUnique<FOutputDeviceTestExit>(MoveTemp(ExitPhrasesList));
				GLog->AddOutputDevice(GScopedTestExit.Get());
			}
		}
	}

	// Activates malloc frame profiler from the command line 
	// Recommend enabling bGenerateSymbols to ensure callstacks can resolve and bRetainFramePointers to ensure frame pointers remain valid.
	// Also disabling the hitch detector ALLOW_HITCH_DETECTION=0 helps ensure quicker more accurate runs.
	if (FParse::Param(FCommandLine::Get(), TEXT("mallocframeprofiler")))
	{
		GMallocFrameProfilerEnabled = true;
		GMalloc = FMallocFrameProfiler::OverrideIfEnabled(GMalloc);
	}
#endif // !UE_BUILD_SHIPPING

	// Switch into executable's directory (may be required by some of the platform file overrides)
	FPlatformProcess::SetCurrentWorkingDirectoryToBaseDir();

	// This fixes up the relative project path, needs to happen before we set platform file paths
	if (FPlatformProperties::IsProgram() == false)
	{
		SCOPED_BOOT_TIMING("Fix up the relative project path");

		if (FPaths::IsProjectFilePathSet())
		{
			FString ProjPath = FPaths::GetProjectFilePath();
			if (FPaths::FileExists(ProjPath) == false)
			{
				// display it multiple ways, it's very important error message...
				FPlatformMisc::LowLevelOutputDebugStringf(TEXT("Project file not found: %s\n"), *ProjPath);
				UE_LOG(LogInit, Display, TEXT("Project file not found: %s"), *ProjPath);
				UE_LOG(LogInit, Display, TEXT("\tAttempting to find via project info helper."));
				// Use the uprojectdirs
				FString GameProjectFile = FUProjectDictionary::GetDefault().GetRelativeProjectPathForGame(FApp::GetProjectName(), FPlatformProcess::BaseDir());
				if (GameProjectFile.IsEmpty() == false)
				{
					UE_LOG(LogInit, Display, TEXT("\tFound project file %s."), *GameProjectFile);
					FPaths::SetProjectFilePath(GameProjectFile);

					// Fixup command line if project file wasn't found in specified directory to properly parse next arguments.
					FString OldCommandLine = FString(FCommandLine::Get());
					OldCommandLine.ReplaceInline(*GameProjectFilePathUnnormalized, *GameProjectFile, ESearchCase::CaseSensitive);
					FCommandLine::Set(*OldCommandLine);
					CmdLine = FCommandLine::Get();
				}
			}
		}
	}

	// Output devices.
	{
		SCOPED_BOOT_TIMING("Init Output Devices");
#if WITH_APPLICATION_CORE
		GError = FPlatformApplicationMisc::GetErrorOutputDevice();
		GWarn = FPlatformApplicationMisc::GetFeedbackContext();
#else
		GError = FPlatformOutputDevices::GetError();
		GWarn = FPlatformOutputDevices::GetFeedbackContext();
#endif
	}

	// Avoiding potential exploits by not exposing command line overrides in the shipping games.
#if !UE_BUILD_SHIPPING
	{
		SCOPED_BOOT_TIMING("Command Line Adjustments");

		FConfigFile CommandLineAliasesConfigFile;
		if (FPaths::ProjectDir().Len() > 0)
		{
			// Pass GeneratedConfigDir as nullptr instead of FPaths::GeneratedConfigDir() so that saved directory is not cached before -saveddir argument can be added
			const TCHAR* GeneratedConfigDir = nullptr;

			FConfigCacheIni::LoadExternalIniFile(CommandLineAliasesConfigFile, TEXT("CommandLineAliases"), nullptr, *FPaths::Combine(FPaths::ProjectDir(), TEXT("Config")),
												 /*bIsBaseIniName=*/ false,
												 /*Platform=*/ nullptr,
												 /*bForceReload=*/ false,
												 /*bWriteDestIni=*/ false,
												 /*bAllowGeneratedIniWhenCooked=*/ true,
												 GeneratedConfigDir);
		}

		TArray<FString> PrevAliasExpansions;
		TArray<FString> PrevCmdLineFileExpansions;

		bool bChanged = false;
		for(;;)
		{
			bool bExpandedAliases = false;
			LaunchCheckForCommandLineAliases(CommandLineAliasesConfigFile, PrevAliasExpansions, bExpandedAliases);

			bool bExpandedCmdLineFile = false;
			LaunchCheckForCmdLineFile(PrevCmdLineFileExpansions, bExpandedCmdLineFile);

			if(bExpandedAliases || bExpandedCmdLineFile)
			{
				bChanged = true;
			}
			else
			{
				break;
			}
		}

		if (bChanged)
		{
			CmdLine = FCommandLine::Get();
		}
	}
#endif

#if USE_IO_DISPATCHER
	if (FIoStatus Status = FIoDispatcher::Initialize(); !Status.IsOk())
	{
		UE_LOG(LogInit, Error, TEXT("Failed to initialize I/O dispatcher: '%s'"), *Status.ToString());
		return 1;
	}
#endif

	{
		SCOPED_BOOT_TIMING("BeginPreInitTextLocalization");
		BeginPreInitTextLocalization();
	}

#if WITH_ENGINE
	{
		SCOPED_BOOT_TIMING("PreInitShaderLibrary");
		FShaderCodeLibrary::PreInit();
	}
#endif // WITH_ENGINE

	// allow the command line to override the platform file singleton
	bool bFileOverrideFound = false;
	{
		SCOPED_BOOT_TIMING("LaunchCheckForFileOverride");
		if (LaunchCheckForFileOverride(CmdLine, bFileOverrideFound) == false)
		{
			// if it failed, we cannot continue
			return 1;
		}
	}

	// 
#if PLATFORM_DESKTOP && !IS_MONOLITHIC
	{
		SCOPED_BOOT_TIMING("AddExtraBinarySearchPaths");
		FModuleManager::Get().AddExtraBinarySearchPaths();
	}
#endif

	// Initialize file manager
	{
		SCOPED_BOOT_TIMING("IFileManager::Get().ProcessCommandLineOptions");
		IFileManager::Get().ProcessCommandLineOptions();
	}

#if WITH_COREUOBJECT
	{
		SCOPED_BOOT_TIMING("InitializeNewAsyncIO");
		FPlatformFileManager::Get().InitializeNewAsyncIO();
	}
#endif

	FDelayedAutoRegisterHelper::RunAndClearDelayedAutoRegisterDelegates(EDelayedRegisterRunPhase::FileSystemReady);

	if (GIsGameAgnosticExe)
	{
		// If we launched without a project file, but with a game name that is incomplete, warn about the improper use of a Game suffix
		if (LaunchHasIncompleteGameName())
		{
			// We did not find a non-suffixed folder and we DID find the suffixed one.
			// The engine MUST be launched with <GameName>Game.
			const FText GameNameText = FText::FromString(FApp::GetProjectName());
			FMessageDialog::Open(EAppMsgType::Ok, FText::Format(LOCTEXT("RequiresGamePrefix", "Error: UnrealEditor does not append 'Game' to the passed in game name.\nYou must use the full name.\nYou specified '{0}', use '{0}Game'."), GameNameText));
			return 1;
		}
	}

	// remember thread id of the main thread
	GGameThreadId = FPlatformTLS::GetCurrentThreadId();
	GIsGameThreadIdInitialized = true;

	FPlatformProcess::SetThreadAffinityMask(FPlatformAffinity::GetMainGameMask());
	FPlatformProcess::SetupGameThread();

	// These bools are the mode selector and are mutually exclusive. This function selects the mode by calling one of the 
	// SetIsRunningAs* lambdas, which it does based on commandline and configuration considerations in a specific order.
	// TODO: Convert these bools to an enum since they are mutually exclusive.
	bool bHasCommandletToken = false;
	bool bHasEditorToken = false;
	bool bIsRunningAsDedicatedServer = false;
	bool bIsRegularClient = false;

	const SIZE_T CommandLineSize = FCString::Strlen(CmdLine) + 1;
	TCHAR* CommandLineCopy = new TCHAR[CommandLineSize];
	FCString::Strcpy(CommandLineCopy, CommandLineSize, CmdLine);
	const TCHAR* ParsedCmdLine = CommandLineCopy;

	FString Token = FParse::Token(ParsedCmdLine, 0);
	// trim any whitespace at edges of string - this can happen if the token was quoted with leading or trailing whitespace
	// VC++ tends to do this in its "external tools" config
	Token.TrimStartAndEndInline();

	auto IsModeSelected = [&bHasCommandletToken, &bHasEditorToken, &bIsRegularClient, &bIsRunningAsDedicatedServer]()
	{
		return bHasCommandletToken || bHasEditorToken || bIsRegularClient || bIsRunningAsDedicatedServer;
	};
#if UE_EDITOR || WITH_ENGINE || WITH_EDITOR
	const TCHAR* CommandletCommandLine = nullptr;
	auto SetIsRunningAsCommandlet = [&CommandletCommandLine, &ParsedCmdLine,
		&bHasCommandletToken, &bIsRunningAsDedicatedServer, &bHasEditorToken, &bIsRegularClient, &IsModeSelected]
		(FStringView CommandletName)
	{
		checkf(!IsModeSelected(), TEXT("SetIsRunningAsCommandlet should not be called after mode has been selected."));
		bHasCommandletToken = true;

		GIsClient = true;
		GIsServer = true;
#if WITH_EDITORONLY_DATA
		GIsEditor = true;
#endif
#if STATS
		// Leave the stats enabled.
		if (!FStats::EnabledForCommandlet())
		{
			FThreadStats::MasterDisableForever();
		}
#endif

		CommandletCommandLine = ParsedCmdLine;
#if WITH_EDITOR
		if (CommandletName == TEXTVIEW("cookcommandlet"))
		{
			PRIVATE_GIsRunningCookCommandlet = true;
		}
#endif
#if WITH_ENGINE
		PRIVATE_GIsRunningCommandlet = true;
#endif
		// Allow commandlet rendering and/or audio based on command line switch (too early to let the commandlet itself override this).
		PRIVATE_GAllowCommandletRendering = FParse::Param(FCommandLine::Get(), TEXT("AllowCommandletRendering"));
		PRIVATE_GAllowCommandletAudio = FParse::Param(FCommandLine::Get(), TEXT("AllowCommandletAudio"));
	};
#endif // UE_EDITOR || WITH_ENGINE || WITH_EDITOR
	auto SetIsRunningAsRegularClient = [&IsModeSelected, &bIsRegularClient]()
	{
		checkf(!IsModeSelected(), TEXT("SetIsRunningAsRegularClient should not be called after mode has been selected."));
		bIsRegularClient = true;

		GIsClient = true;
		GIsServer = false;
#if WITH_EDITORONLY_DATA
		GIsEditor = false;
#endif
#if WITH_ENGINE
		checkf(!PRIVATE_GIsRunningCommandlet, TEXT("It should not be possible for PRIVATE_GIsRunningCommandlet to have been set when calling SetIsRunningAsRegularClient"));
#endif
	};
	auto SetIsRunningAsDedicatedServer = [&IsModeSelected, &bIsRunningAsDedicatedServer]()
	{
		checkf(!IsModeSelected(), TEXT("SetIsRunningAsDedicatedServer should not be called after mode has been selected."));
		bIsRunningAsDedicatedServer = true;

		GIsClient = false;
		GIsServer = true;
#if WITH_EDITORONLY_DATA
		GIsEditor = false;
#endif
#if WITH_ENGINE
		checkf(!PRIVATE_GIsRunningCommandlet, TEXT("It should not be possible for PRIVATE_GIsRunningCommandlet to have been set when calling SetIsRunningAsDedicatedServer"));
#endif
	};
#if WITH_EDITORONLY_DATA
	auto SetIsRunningAsEditor = [&IsModeSelected, &bHasEditorToken]()
	{
		checkf(!IsModeSelected(), TEXT("SetIsRunningAsEditor should not be called after mode has been selected."));
		bHasEditorToken = true;

		GIsClient = true;
		GIsServer = true;
		GIsEditor = true;
#if WITH_ENGINE
		checkf(!PRIVATE_GIsRunningCommandlet, TEXT("It should not be possible for PRIVATE_GIsRunningCommandlet to have been set when calling SetIsRunningAsEditor"));
#endif
	};
#endif

#if WITH_EDITOR
	if (GIsUCCMakeStandaloneHeaderGenerator)
	{
		// Header generation is treated as a commandlet
		checkf(!IsRunningDedicatedServer(), TEXT("GIsUCCMakeStandaloneHeaderGenerator is not supported in a ServerOnly configuration, or with -server on commandline."));
		Token = TEXT("GIsUCCMakeStandaloneHeaderGenerator");
		SetIsRunningAsCommandlet(Token);
	}
	else
#endif
	{
		if (IsRunningDedicatedServer())
		{
			SetIsRunningAsDedicatedServer();
		}
	}

#if UE_EDITOR || WITH_ENGINE || WITH_EDITOR
	TArray<FString> NonSwitchTokens;
	TArray<FString> Switches;
	UCommandlet::ParseCommandLine(CommandLineCopy, NonSwitchTokens, Switches);
	if (!IsModeSelected())
	{
		for (const FString& ParsedToken : NonSwitchTokens)
		{
			if (ParsedToken.EndsWith(TEXT("Commandlet")))
			{
				Token = ParsedToken;
				Token.TrimStartAndEndInline();
				SetIsRunningAsCommandlet(Token);
				break;
			}
		}
		if (!bHasCommandletToken)
		{
			for (const FString& ParsedSwitch : Switches)
			{
				if (ParsedSwitch.StartsWith(TEXT("RUN=")))
				{
					Token = ParsedSwitch.RightChop(4);
					Token.TrimStartAndEndInline();
					if (!Token.EndsWith(TEXT("Commandlet")))
					{
						Token += TEXT("Commandlet");
					}
					SetIsRunningAsCommandlet(Token);
					break;
				}
			}
		}
	}
#endif // UE_EDITOR || WITH_ENGINE

	// In the commandlet case, we have set the Token to something other than the first token from commandline.
	// In all other cases we should check for the first token being the Project Specifier
	if (!bHasCommandletToken)
	{
		// Path returned by FPaths::GetProjectFilePath() is normalized, so may have symlinks and ~ resolved and may differ from the original path to .uproject passed in the command line
		FString NormalizedToken = Token;
		FPaths::NormalizeFilename(NormalizedToken);

		const bool bFirstTokenIsGameName = (FApp::HasProjectName() && Token == FApp::GetProjectName());
		const bool bFirstTokenIsGameProjectFilePath = (FPaths::IsProjectFilePathSet() && NormalizedToken == FPaths::GetProjectFilePath());
		const bool bFirstTokenIsGameProjectFileShortName = (FPaths::IsProjectFilePathSet() && Token == FPaths::GetCleanFilename(FPaths::GetProjectFilePath()));

		if (bFirstTokenIsGameName || bFirstTokenIsGameProjectFilePath || bFirstTokenIsGameProjectFileShortName)
		{
			// The first item on command line was the game name, ignore it and get the next item for the Token
			FString RemainingCommandline = ParsedCmdLine;
			FCString::Strcpy(CommandLineCopy, CommandLineSize, *RemainingCommandline);
			ParsedCmdLine = CommandLineCopy;

			// Set a new command-line that doesn't include the game name as the first argument
			FCommandLine::Set(ParsedCmdLine);

			Token = FParse::Token(ParsedCmdLine, 0);
			Token.TrimStartInline();

			// if the next token is a project file, then we skip it (which can happen on some platforms that combine
			// commandlines... this handles extra .uprojects, but if you run with MyGame MyGame, we can't tell if
			// the second MyGame is a map or not)
			while (FPaths::GetExtension(Token) == FProjectDescriptor::GetExtension())
			{
				Token = FParse::Token(ParsedCmdLine, 0);
				Token.TrimStartInline();
			}

			if (bFirstTokenIsGameProjectFilePath || bFirstTokenIsGameProjectFileShortName)
			{
				// Convert it to relative if possible...
				FString RelativeGameProjectFilePath = FFileManagerGeneric::DefaultConvertToRelativePath(*FPaths::GetProjectFilePath());
				if (RelativeGameProjectFilePath != FPaths::GetProjectFilePath())
				{
					FPaths::SetProjectFilePath(RelativeGameProjectFilePath);
				}
			}
		}

#if UE_EDITOR
		// Handle the first token being '-game' or '-server'
		if (Token == TEXT("-GAME") || Token == TEXT("-SERVER"))
		{
			// This isn't necessarily pretty, but many requests have been made to allow
			//   UnrealEditor.exe <GAMENAME> -game <map>
			// or
			//   UnrealEditor.exe <GAMENAME> -game 127.0.0.0
			// We don't want to remove the -game from the commandline just yet in case
			// we need it for something later. So, just move it to the end for now...
			FString RemainingCommandline = ParsedCmdLine;
			RemainingCommandline.TrimStartInline();
			RemainingCommandline += FString::Printf(TEXT(" %s"), *Token);
			FCommandLine::Set(*RemainingCommandline);
		}
#endif
	}

	// If we have no Commandlet or -server, test if we are running as the editor, and set the GIsEditor/GIsClient/GIsServer flags if so.
	// Do this early (and certainly before AppInit) so plugin-consumed library code can know (they wouldn't otherwise)
	// Things like the config system behave differently based on these globals, and we aren't the editor by default.
	if (!IsModeSelected())
	{
#if UE_EDITOR
		if (!Switches.Contains(TEXT("GAME")))
		{
			SetIsRunningAsEditor();
		}
#elif WITH_ENGINE && WITH_EDITOR && WITH_EDITORONLY_DATA 
		// If a non-editor target build w/ WITH_EDITOR and WITH_EDITORONLY_DATA, use the old token check...
		//@todo. Is this something we need to support?
		if (Token == TEXT("EDITOR"))
		{
			SetIsRunningAsEditor();
		}
#endif
		// Game, server and non-engine programs never run as the editor
	}

#if UE_EDITOR
	// In the UE_EDITOR configuration we now know enough to finish the mode decision and decide between commandlet or client
	// In other configurations we still may need to check the Token for whether it is a commandlet and we make the decision below
	if (!IsModeSelected())
	{
		SetIsRunningAsRegularClient();
	}

	if (bHasEditorToken && GIsGameAgnosticExe)
	{
		// If we launched the editor IDE (e.g. not commandlet or -game) without a game name or project name, try to load the most recently loaded project file.
		// We can not do this if we are using a FilePlatform override since the game directory may already be established.
		const bool bIsBuildMachine = FParse::Param(FCommandLine::Get(), TEXT("BUILDMACHINE"));
		const bool bLoadMostRecentProjectFileIfItExists = !FApp::HasProjectName() && !bFileOverrideFound && !bIsBuildMachine && !FParse::Param(CmdLine, TEXT("norecentproject"));
		if (bLoadMostRecentProjectFileIfItExists)
		{
			LaunchUpdateMostRecentProjectFile();
		}
	}
#endif

#if !UE_BUILD_SHIPPING
	// Benchmarking.
	FApp::SetBenchmarking(FParse::Param(FCommandLine::Get(), TEXT("BENCHMARK")));
#else
	FApp::SetBenchmarking(false);
#endif // !UE_BUILD_SHIPPING

	// "-Deterministic" is a shortcut for "-UseFixedTimeStep -FixedSeed"
	bool bDeterministic = FParse::Param(FCommandLine::Get(), TEXT("Deterministic"));

	FApp::SetUseFixedTimeStep(bDeterministic || FParse::Param(FCommandLine::Get(), TEXT("UseFixedTimeStep")));

	FApp::bUseFixedSeed = bDeterministic || FApp::IsBenchmarking() || FParse::Param(FCommandLine::Get(), TEXT("FixedSeed"));

	// Initialize random number generator.
	{
		uint32 Seed1 = 0;
		uint32 Seed2 = 0;

		if (!FApp::bUseFixedSeed)
		{
			Seed1 = FPlatformTime::Cycles();
			Seed2 = FPlatformTime::Cycles();
		}

		FMath::RandInit(Seed1);
		FMath::SRandInit(Seed2);

		UE_LOG(LogInit, Verbose, TEXT("RandInit(%d) SRandInit(%d)."), Seed1, Seed2);
	}

#if !IS_PROGRAM
	if (!GIsGameAgnosticExe && FApp::HasProjectName() && !FPaths::IsProjectFilePathSet())
	{
		// If we are using a non-agnostic exe where a name was specified but we did not specify a project path. Assemble one based on the game name.
		const FString ProjectFilePath = FPaths::Combine(*FPaths::ProjectDir(), *FString::Printf(TEXT("%s.%s"), FApp::GetProjectName(), *FProjectDescriptor::GetExtension()));
		FPaths::SetProjectFilePath(ProjectFilePath);
	}
#endif

	// Initialize platform file with knowledge of the project file path before fixing the casing
	FPlatformFileManager::Get().GetPlatformFile().InitializeAfterProjectFilePath();

#if !IS_PROGRAM
	// Now let the platform file fix the project file path case before we attempt to fix the game name
	LaunchFixProjectPathCase();
#endif

	// Now verify the project file if we have one
	if (FPaths::IsProjectFilePathSet()
#if IS_PROGRAM
		// Programs don't need uproject files to exist, but some do specify them and if they exist we should load them
		&& FPaths::FileExists(FPaths::GetProjectFilePath())
#endif
		)
	{
		SCOPED_BOOT_TIMING("IProjectManager::Get().LoadProjectFile");

		if (!IProjectManager::Get().LoadProjectFile(FPaths::GetProjectFilePath()))
		{
			// The project file was invalid or saved with a newer version of the engine. Exit.
			UE_LOG(LogInit, Warning, TEXT("Could not find a valid project file, the engine will exit now."));
			return 1;
		}

		if (IProjectManager::Get().IsEnterpriseProject() && FPaths::DirectoryExists(FPaths::EnterpriseDir()))
		{
			// Add the enterprise binaries directory if we're an enterprise project
			FModuleManager::Get().AddBinariesDirectory(*FPaths::Combine(FPaths::EnterpriseDir(), TEXT("Binaries"), FPlatformProcess::GetBinariesSubdirectory()), false);
		}
	}

#if !IS_PROGRAM
	if (FApp::HasProjectName())
	{
		// Tell the module manager what the game binaries folder is
		const FString ProjectBinariesDirectory = FPaths::Combine(FPlatformMisc::ProjectDir(), TEXT("Binaries"), FPlatformProcess::GetBinariesSubdirectory());
		FPlatformProcess::AddDllDirectory(*ProjectBinariesDirectory);
		FModuleManager::Get().SetGameBinariesDirectory(*ProjectBinariesDirectory);

		LaunchFixGameNameCase();
	}
#endif

#if WITH_ENGINE
	// Add the default engine shader dir
	AddShaderSourceDirectoryMapping(TEXT("/Engine"), FPlatformProcess::ShaderDir());

#if WITH_EDITOR
	{
		IPlatformFile& PlatformFile = FPlatformFileManager::Get().GetPlatformFile();
		FString ProjectIntermediateDir = FPaths::ProjectIntermediateDir();
		bool bCreateIntermediateSuccess = PlatformFile.CreateDirectoryTree(*ProjectIntermediateDir);
		if (!bCreateIntermediateSuccess)
		{
			UE_LOG(LogInit, Fatal, TEXT("Failed to create Intermediate directory '%s'."), *ProjectIntermediateDir);
		}

		FString AutogenAbsolutePath = FPaths::ConvertRelativePathToFull(ProjectIntermediateDir / TEXT("ShaderAutogen"));
		bool bCreateAutogenSuccess = PlatformFile.CreateDirectory(*AutogenAbsolutePath);
		if (!bCreateAutogenSuccess)
		{
			UE_LOG(LogInit, Fatal, TEXT("Failed to create Intermediate/ShaderAutogen/ directory '%s'. Make sure Intermediate exists."), *AutogenAbsolutePath);
		}

		AddShaderSourceDirectoryMapping(TEXT("/ShaderAutogen"), AutogenAbsolutePath);
	}
#endif //WITH_EDITOR
#endif //WITH_ENGINE

	// Some programs might not use the taskgraph or thread pool
	bool bCreateTaskGraphAndThreadPools = true;
	// If STATS is defined (via FORCE_USE_STATS or other), we have to call FTaskGraphInterface::Startup()
#if IS_PROGRAM && !STATS
	bCreateTaskGraphAndThreadPools = !FParse::Param(FCommandLine::Get(), TEXT("ReduceThreadUsage"));
#endif
	if (bCreateTaskGraphAndThreadPools)
	{
		// initialize task graph sub-system with potential multiple threads
		SCOPED_BOOT_TIMING("FTaskGraphInterface::Startup");
		FTaskGraphInterface::Startup(FPlatformMisc::NumberOfWorkerThreadsToSpawn());
		FTaskGraphInterface::Get().AttachToThread(ENamedThreads::GameThread);
	}

	FDelayedAutoRegisterHelper::RunAndClearDelayedAutoRegisterDelegates(EDelayedRegisterRunPhase::TaskGraphSystemReady);

#if STATS
	FThreadStats::StartThread();
#endif

	FDelayedAutoRegisterHelper::RunAndClearDelayedAutoRegisterDelegates(EDelayedRegisterRunPhase::StatSystemReady);

	FScopeCycleCounter CycleCount_AfterStats(GET_STATID(STAT_FEngineLoop_PreInitPreStartupScreen_AfterStats));

	// Load Core modules required for everything else to work (needs to be loaded before InitializeRenderingCVarsCaching)
	{
		SCOPED_BOOT_TIMING("LoadCoreModules");
		if (!LoadCoreModules())
		{
			UE_LOG(LogInit, Error, TEXT("Failed to load Core modules."));
			return 1;
		}
	}

	const bool bDumpEarlyConfigReads = FParse::Param(FCommandLine::Get(), TEXT("DumpEarlyConfigReads"));
	const bool bDumpEarlyPakFileReads = FParse::Param(FCommandLine::Get(), TEXT("DumpEarlyPakFileReads"));
	const bool bForceQuitAfterEarlyReads = FParse::Param(FCommandLine::Get(), TEXT("ForceQuitAfterEarlyReads"));

	// Overly verbose to avoid a dumb static analysis warning
#if WITH_CONFIG_PATCHING
	constexpr bool bWithConfigPatching = true;
#else
	constexpr bool bWithConfigPatching = false;
#endif

	if (bDumpEarlyConfigReads)
	{
		UE::ConfigUtilities::RecordConfigReadsFromIni();
	}

	if (bDumpEarlyPakFileReads)
	{
		RecordFileReadsFromPaks();
	}

	if(bWithConfigPatching)
	{
		UE_LOG(LogInit, Verbose, TEXT("Begin recording CVar changes for config patching."));

		UE::ConfigUtilities::RecordApplyCVarSettingsFromIni();
	}

#if WITH_ENGINE
	extern ENGINE_API void InitializeRenderingCVarsCaching();
	InitializeRenderingCVarsCaching();
#endif

#if WITH_EDITOR
	// If we're running as a game or server but don't have a project, inform the user and exit.
	if (bHasEditorToken == false && bHasCommandletToken == false)
	{
		if (!FPaths::IsProjectFilePathSet())
		{
			//@todo this is too early to localize
			FMessageDialog::Open(EAppMsgType::Ok, NSLOCTEXT("Engine", "UERequiresProjectFiles", "Unreal Engine games require a project file as the first parameter."));
			return 1;
		}
	}

#endif //WITH_EDITOR

	if (FPlatformProcess::SupportsMultithreading() && bCreateTaskGraphAndThreadPools)
	{
		SCOPED_BOOT_TIMING("Init FQueuedThreadPool's");

		int32 StackSize = 128 * 1024;
		// GConfig is not initialized yet, the only solution for now is to hardcode desired values
		// GConfig->GetInt(TEXT("Core.System"), TEXT("PoolThreadStackSize"), StackSize, GEngineIni);

		bool bForceEditorStackSize = false;
#if WITH_EDITOR
		bForceEditorStackSize = true;
#endif

		if (bHasEditorToken || bForceEditorStackSize)
		{
			StackSize = 1024 * 1024;
		}

#if WITH_EDITOR
		{
			int32 NumThreadsInLargeThreadPool = FMath::Max(FPlatformMisc::NumberOfCoresIncludingHyperthreads() - 2, 2);
			int32 NumThreadsInThreadPool = FPlatformMisc::NumberOfWorkerThreadsToSpawn();
			// when we are in the editor we like to do things like build lighting and such
			// this thread pool can be used for those purposes
			extern CORE_API int32 GUseNewTaskBackend;
			if (!GUseNewTaskBackend)
			{
				GLargeThreadPool = FQueuedThreadPool::Allocate();
			}
			else
			{
				GLargeThreadPool = new FQueuedLowLevelThreadPool();
			}
		
			// TaskGraph has it's HP threads slightly below normal, we want to be below the taskgraph HP threads to avoid interfering with the game-thread.
			verify(GLargeThreadPool->Create(NumThreadsInLargeThreadPool, StackSize, TPri_BelowNormal, TEXT("LargeThreadPool")));

			// we are only going to give dedicated servers one pool thread
			if (FPlatformProperties::IsServerOnly())
			{
				NumThreadsInThreadPool = 1;
			}

			// GThreadPool will schedule on the LargeThreadPool but limit max concurrency to the given number.
			GThreadPool = new FQueuedThreadPoolWrapper(GLargeThreadPool, NumThreadsInThreadPool);
		}
#else
		{
			extern CORE_API int32 GUseNewTaskBackend;
			if (!GUseNewTaskBackend)
			{
				GThreadPool = FQueuedThreadPool::Allocate();
				int32 NumThreadsInThreadPool = FPlatformMisc::NumberOfWorkerThreadsToSpawn();

				// we are only going to give dedicated servers one pool thread
				if (FPlatformProperties::IsServerOnly())
				{
					NumThreadsInThreadPool = 1;
				}
				verify(GThreadPool->Create(NumThreadsInThreadPool, StackSize, TPri_SlightlyBelowNormal, TEXT("ThreadPool")));
			}
			else
			{
				GThreadPool = new FQueuedLowLevelThreadPool();
			}
		}
#endif
		{
			GBackgroundPriorityThreadPool = FQueuedThreadPool::Allocate();
			int32 NumThreadsInThreadPool = 2;
			if (FPlatformProperties::IsServerOnly())
			{
				NumThreadsInThreadPool = 1;
			}

			verify(GBackgroundPriorityThreadPool->Create(NumThreadsInThreadPool, StackSize, TPri_Lowest, TEXT("BackgroundThreadPool")));
		}

	}

#if WITH_APPLICATION_CORE
	// Get a pointer to the log output device
	GLogConsole = GScopedLogConsole.Get();
#endif

	// init Oodle here
	FOodleDataCompression::StartupPreInit();

	{
		SCOPED_BOOT_TIMING("LoadPreInitModules");
		LoadPreInitModules();
	}

#if WITH_ENGINE && CSV_PROFILER
	FCoreDelegates::OnBeginFrame.AddStatic(UpdateCoreCsvStats_BeginFrame);
	FCoreDelegates::OnEndFrame.AddStatic(UpdateCoreCsvStats_EndFrame);
	FCsvProfiler::Get()->Init();
#endif

#if WITH_ENGINE
	AppLifetimeEventCapture::Init();

	if (bHasEditorToken)
	{
#if WITH_EDITOR
		GWarn = &UnrealEdWarn;
#else //WITH_EDITOR
		FMessageDialog::Open(EAppMsgType::Ok, NSLOCTEXT("Engine", "EditorNotSupported", "Editor not supported in this mode."));
		FPlatformMisc::RequestExit(false);
		return 1;
#endif //WITH_EDITOR
	}
#endif // WITH_ENGINE

	// If we're not in the editor stop collecting the backlog now that we know
	if (!GIsEditor)
	{
		GLog->EnableBacklog(false);
	}

#if WITH_ENGINE && TRACING_PROFILER
PRAGMA_DISABLE_DEPRECATION_WARNINGS
	FTracingProfiler::Get()->Init();
PRAGMA_ENABLE_DEPRECATION_WARNINGS
#endif
#if WITH_ENGINE && FRAMEPRO_ENABLED
	FFrameProProfiler::Initialize();
#endif // FRAMEPRO_ENABLED

	// Start the application
	{
		SCOPED_BOOT_TIMING("AppInit");
		if (!AppInit())
		{
			return 1;
		}
	}

	if (FPlatformProcess::SupportsMultithreading())
	{
		{
			SCOPED_BOOT_TIMING("GIOThreadPool->Create");
			GIOThreadPool = FQueuedThreadPool::Allocate();
			int32 NumThreadsInThreadPool = FPlatformMisc::NumberOfIOWorkerThreadsToSpawn();
			if (FPlatformProperties::IsServerOnly())
			{
				NumThreadsInThreadPool = 2;
			}
			verify(GIOThreadPool->Create(NumThreadsInThreadPool, 96 * 1024, TPri_AboveNormal, TEXT("IOThreadPool")));
		}
	}

	FEmbeddedCommunication::ForceTick(1);

#if WITH_ENGINE
	{
		SCOPED_BOOT_TIMING("System settings and cvar init");
		// Initialize system settings before anyone tries to use it...
		GSystemSettings.Initialize(bHasEditorToken);

		// Apply renderer settings from console variables stored in the INI.
		UE::ConfigUtilities::ApplyCVarSettingsFromIni(TEXT("/Script/Engine.RendererSettings"), *GEngineIni, ECVF_SetByProjectSetting);
		UE::ConfigUtilities::ApplyCVarSettingsFromIni(TEXT("/Script/Engine.RendererOverrideSettings"), *GEngineIni, ECVF_SetByProjectSetting);
		UE::ConfigUtilities::ApplyCVarSettingsFromIni(TEXT("/Script/Engine.StreamingSettings"), *GEngineIni, ECVF_SetByProjectSetting);
		UE::ConfigUtilities::ApplyCVarSettingsFromIni(TEXT("/Script/Engine.GarbageCollectionSettings"), *GEngineIni, ECVF_SetByProjectSetting);
		UE::ConfigUtilities::ApplyCVarSettingsFromIni(TEXT("/Script/Engine.NetworkSettings"), *GEngineIni, ECVF_SetByProjectSetting);
#if WITH_EDITOR
		UE::ConfigUtilities::ApplyCVarSettingsFromIni(TEXT("/Script/UnrealEd.CookerSettings"), *GEngineIni, ECVF_SetByProjectSetting);
#endif

#if !UE_SERVER
		if (!bIsRunningAsDedicatedServer)
		{
			if (!bHasCommandletToken)
			{
				// Note: It is critical that resolution settings are loaded before the movie starts playing so that the window size and fullscreen state is known
				UGameUserSettings::PreloadResolutionSettings();
			}
		}
#endif
	}
	{
		{
			SCOPED_BOOT_TIMING("InitScalabilitySystem");
			// Init scalability system and defaults
			Scalability::InitScalabilitySystem();
		}

		{
			SCOPED_BOOT_TIMING("InitializeCVarsForActiveDeviceProfile");
			// Set all CVars which have been setup in the device profiles.
			// This may include scalability group settings which will override
			// the defaults set above which can then be replaced below when
			// the game user settings are loaded and applied.
			UDeviceProfileManager::InitializeCVarsForActiveDeviceProfile();
		}

		{
			SCOPED_BOOT_TIMING("Scalability::LoadState");
			// As early as possible to avoid expensive re-init of subsystems,
			// after SystemSettings.ini file loading so we get the right state,
			// before ConsoleVariables.ini so the local developer can always override.
			// after InitializeCVarsForActiveDeviceProfile() so the user can override platform defaults
			Scalability::LoadState((bHasEditorToken && !GEditorSettingsIni.IsEmpty()) ? GEditorSettingsIni : GGameUserSettingsIni);
		}

		if (FPlatformMisc::UseRenderThread())
		{
			GUseThreadedRendering = true;
		}
	}
#endif

	{
		SCOPED_BOOT_TIMING("LoadConsoleVariablesFromINI");
		FConfigCacheIni::LoadConsoleVariablesFromINI();
	}

	{
		SCOPED_BOOT_TIMING("Platform Initialization");
		DECLARE_SCOPE_CYCLE_COUNTER(TEXT("Platform Initialization"), STAT_PlatformInit, STATGROUP_LoadTime);

		// platform specific initialization now that the SystemSettings are loaded
		FPlatformMisc::PlatformInit();
#if WITH_APPLICATION_CORE
		FPlatformApplicationMisc::Init();
#endif
		FPlatformMemory::Init();
	}

#if WITH_ENGINE
	{
		SCOPED_BOOT_TIMING("InitDerivedData");
		UE::DerivedData::IoStore::InitializeIoDispatcher();
	}
#endif // WITH_ENGINE

#if !UE_BUILD_SHIPPING
	{
		int32 ExtraDevelopmentMemoryMB = (int32)(FPlatformMemory::GetExtraDevelopmentMemorySize() / 1024ull / 1024ull);
		CSV_METADATA(TEXT("ExtraDevelopmentMemoryMB"), *FString::FromInt(ExtraDevelopmentMemoryMB));
	}
#endif

#if USE_IO_DISPATCHER
	{
		SCOPED_BOOT_TIMING("InitIoDispatcher");
		FIoDispatcher::InitializePostSettings();
	}
#endif

	// Let LogConsole know what ini file it should use to save its setting on exit.
	// We can't use GGameIni inside log console because it's destroyed in the global
	// scoped pointer and at that moment GGameIni may already be gone.
	if (GLogConsole != nullptr)
	{
		GLogConsole->SetIniFilename(*GGameIni);
	}


#if CHECK_PUREVIRTUALS
	FMessageDialog::Open(EAppMsgType::Ok, NSLOCTEXT("Engine", "Error_PureVirtualsEnabled", "The game cannot run with CHECK_PUREVIRTUALS enabled.  Please disable CHECK_PUREVIRTUALS and rebuild the executable."));
	FPlatformMisc::RequestExit(false);
#endif

	FEmbeddedCommunication::ForceTick(2);

#if WITH_ENGINE
	// allow for game explorer processing (including parental controls) and firewalls installation
	if (!FPlatformMisc::CommandLineCommands())
	{
		FPlatformMisc::RequestExit(false);
	}

#if !UE_EDITOR
	// UE_EDITOR doesn't care the meaning of the token except for a few special cases (FooCommandlet, -run=, -game, -server)
	// But when running without UE_EDITOR, we look up the token as a class to see if it is a commandlet name prefix
	bool bIsLateCommandletToken = false;
	if (!IsModeSelected())
	{
		//@hack: We need to set these before calling StaticLoadClass so all required data gets loaded for the commandlets.
		TGuardValue<bool> ScopedGIsClient(GIsClient, true);
		TGuardValue<bool> ScopedGIsServer(GIsServer, true);
#if WITH_EDITOR
		TGuardValue<bool> ScopedGIsEditor(GIsEditor, true);
#endif // WITH_EDITOR
		TGuardValue<bool> ScopedGIsRunningCommandlet(PRIVATE_GIsRunningCommandlet, true);

		bool bIsPossiblyCommandletName = Token.Len() && !Token.Contains(TEXT("-"));
		if (bIsPossiblyCommandletName)
		{
			UClass* TempCommandletClass = FindFirstObject<UClass>(*(Token + TEXT("Commandlet")), EFindFirstObjectOptions::None, ELogVerbosity::Warning, TEXT("Looking for commandlet class"));
			if (TempCommandletClass)
			{
				checkf(TempCommandletClass->IsChildOf(UCommandlet::StaticClass()), TEXT("It is not valid to have a class that ends with \"Commandlet\" that is not a UCommandlet subclass."));
				Token += TEXT("Commandlet");
				bIsLateCommandletToken = true;
			}
		}
	}
	if (bIsLateCommandletToken)
	{
		SetIsRunningAsCommandlet(Token);
	}

	// In non-UE_EDITOR configuration this is the point where know enough to finish the mode decision and decide between commandlet or client
	if (!IsModeSelected())
	{
		SetIsRunningAsRegularClient();
	}
#endif

	// If std out device hasn't been initialized yet (there was no -stdout param in the command line) and
	// we meet all the criteria, initialize it now.
	if (!GScopedStdOut && !bHasEditorToken && !bIsRegularClient && !bIsRunningAsDedicatedServer)
	{
		SCOPED_BOOT_TIMING("InitializeStdOutDevice");

		InitializeStdOutDevice();
	}

#if WITH_EDITOR
	if (IsRunningCookCommandlet())
	{
		ITargetPlatformManagerModule* TargetPlatformManager = GetTargetPlatformManager(false);
		FString InitErrors;
		if (TargetPlatformManager && TargetPlatformManager->HasInitErrors(&InitErrors))
		{
			RequestEngineExit(InitErrors);
			return 1;
		}
	}
#endif

	{
		SCOPED_BOOT_TIMING("IPlatformFeaturesModule::Get()");
		// allow the platform to start up any features it may need
		IPlatformFeaturesModule::Get();
	}

	{
		SCOPED_BOOT_TIMING("InitGamePhys");
		// Init physics engine before loading anything, in case we want to do things like cook during post-load.
		if (!InitGamePhys())
		{
			// If we failed to initialize physics we cannot continue.
			return 1;
		}
	}

	{
		bool bShouldCleanShaderWorkingDirectory = true;
#if !(UE_BUILD_SHIPPING && WITH_EDITOR)
		// Only clean the shader working directory if we are the first instance, to avoid deleting files in use by other instances
		//@todo - check if any other instances are running right now
		bShouldCleanShaderWorkingDirectory = GIsFirstInstance;
#endif

		if (bShouldCleanShaderWorkingDirectory && !FParse::Param(FCommandLine::Get(), TEXT("Multiprocess")))
		{
			SCOPED_BOOT_TIMING("FPlatformProcess::CleanShaderWorkingDirectory");

			// get shader path, and convert it to the userdirectory
			for (const auto& SHaderSourceDirectoryEntry : AllShaderSourceDirectoryMappings())
			{
				FString ShaderDir = FString(FPlatformProcess::BaseDir()) / SHaderSourceDirectoryEntry.Value;
				FString UserShaderDir = IFileManager::Get().ConvertToAbsolutePathForExternalAppForWrite(*ShaderDir);
				FPaths::CollapseRelativeDirectories(ShaderDir);

				// make sure we don't delete from the source directory
				if (ShaderDir != UserShaderDir)
				{
					IFileManager::Get().DeleteDirectory(*UserShaderDir, false, true);
				}
			}

			FPlatformProcess::CleanShaderWorkingDir();
		}
	}

#if !UE_BUILD_SHIPPING
	GIsDemoMode = FParse::Param(FCommandLine::Get(), TEXT("DEMOMODE"));
#endif

	// InitEngineTextLocalization loads Paks, needs Oodle to be setup before here
	InitEngineTextLocalization();

	bool bForceEnableHighDPI = false;
#if WITH_EDITOR
	bForceEnableHighDPI = FPIEPreviewDeviceModule::IsRequestingPreviewDevice();
#endif

	// This must be called before any window (including the splash screen is created
	FSlateApplication::InitHighDPI(bForceEnableHighDPI);

	UStringTable::InitializeEngineBridge();

	if (FApp::ShouldUseThreadingForPerformance() && FPlatformMisc::AllowAudioThread())
	{
		bool bUseThreadedAudio = false;
		if (!GIsEditor)
		{
			GConfig->GetBool(TEXT("Audio"), TEXT("UseAudioThread"), bUseThreadedAudio, GEngineIni);
		}
		FAudioThread::SetUseThreadedAudio(bUseThreadedAudio);
	}

	// Are we creating a slate application?
	bool bSlateApplication = !IsRunningDedicatedServer() && (bIsRegularClient || bHasEditorToken);
	if (bSlateApplication)
	{
		if (FPlatformProcess::SupportsMultithreading())
		{
			SCOPED_BOOT_TIMING("FPlatformSplash::Show()");
			FPlatformSplash::Show();
		}

		// Init platform application
		SCOPED_BOOT_TIMING("FSlateApplication::Create()");
		FSlateApplication::Create();
	}
	else
	{
		// If we're not creating the slate application there is some basic initialization
		// that it does that still must be done
		EKeys::Initialize();
		FSlateApplication::InitializeCoreStyle();
	}

	if (GIsEditor)
	{
		// The editor makes use of all cultures in its UI, so pre-load the resource data now to avoid a hitch later
		FInternationalization::Get().LoadAllCultureData();
	}

	FEmbeddedCommunication::ForceTick(3);

	PreInitContext.SlowTaskPtr = new FScopedSlowTask(100, NSLOCTEXT("EngineLoop", "EngineLoop_Initializing", "Initializing..."));
	FScopedSlowTask& SlowTask = *PreInitContext.SlowTaskPtr;

	SlowTask.EnterProgressFrame(10);

#if USE_LOCALIZED_PACKAGE_CACHE
	FPackageLocalizationManager::Get().InitializeFromLazyCallback([](FPackageLocalizationManager& InPackageLocalizationManager)
	{
		InPackageLocalizationManager.InitializeFromCache(MakeShareable(new FEnginePackageLocalizationCache()));
	});
#endif	// USE_LOCALIZED_PACKAGE_CACHE

	{
		SCOPED_BOOT_TIMING("FUniformBufferStruct::InitializeStructs()");
		FShaderParametersMetadata::InitializeAllUniformBufferStructs();
	}

	{
		SCOPED_BOOT_TIMING("RHIInit");
		// Initialize the RHI.
		RHIInit(bHasEditorToken);
	}

	{
		SCOPED_BOOT_TIMING("RenderUtilsInit");
		// One-time initialization of global variables based on engine configuration.
		RenderUtilsInit();
	}

#if WITH_EDITOR
	{
		// pre-generate certain shader code based on the engine configuration (editor only)
		ShaderAutogenInit();
	}
#endif

	{
		bool bUseCodeLibrary = FPlatformProperties::RequiresCookedData() || GAllowCookedDataInEditorBuilds;
		if (bUseCodeLibrary)
		{
			{
				SCOPED_BOOT_TIMING("FShaderCodeLibrary::InitForRuntime");
				// Will open material shader code storage if project was packaged with it
				// This only opens the Global shader library, which is always in the content dir.
				FShaderCodeLibrary::InitForRuntime(GMaxRHIShaderPlatform);
			}

	#if !UE_EDITOR
			// Cooked data only - but also requires the code library - game only
			if (FPlatformProperties::RequiresCookedData())
			{
				SCOPED_BOOT_TIMING("FShaderPipelineCache::Initialize");
				// Initialize the pipeline cache system. Opening is deferred until the manual call to
				// OpenPipelineFileCache below, after content pak's ShaderCodeLibraries are loaded.
				FShaderPipelineCache::Initialize(GMaxRHIShaderPlatform);
			}
	#endif //!UE_EDITOR
		}
	}

#if WITH_ODSC
	check(!GODSCManager);
	GODSCManager = new FODSCManager();
#endif

	if (!FPlatformProperties::RequiresCookedData())
	{
#if WITH_EDITORONLY_DATA
		{
			// Ensure that DDC is initialized from the game thread.
			SCOPED_BOOT_TIMING("InitDerivedData");
			UE::DerivedData::GetBuild();
			UE::DerivedData::GetCache();
			GetDerivedDataCacheRef();
		}
#endif

#if WITH_EDITOR
		// The virtualization system will be initialized when ever IVirtualizationSystem::Get is called
		// but here we try to explicitly initialize it.
		UE::Virtualization::Initialize();
#endif //WITH_EDITOR

		check(!GDistanceFieldAsyncQueue);
		GDistanceFieldAsyncQueue = new FDistanceFieldAsyncQueue();

		check(!GCardRepresentationAsyncQueue);
		GCardRepresentationAsyncQueue = new FCardRepresentationAsyncQueue();

		if (AllowShaderCompiling())
		{
			check(!GShaderCompilerStats);
			GShaderCompilerStats = new FShaderCompilerStats();

			check(!GShaderCompilingManager);
			GShaderCompilingManager = new FShaderCompilingManager();

			// Shader hash cache is required only for shader compilation.
			InitializeShaderHashCache();
		}
		else
		{
			// create a manager, but it won't do anything internally
			GShaderCompilingManager = new FShaderCompilingManager();
		}
	}

	{
		SCOPED_BOOT_TIMING("GetRendererModule");
		// Cache the renderer module in the main thread so that we can safely retrieve it later from the rendering thread.
		GetRendererModule();
	}

	{
		if (AllowShaderCompiling())
		{
			SCOPED_BOOT_TIMING("InitializeShaderTypes");
			// Initialize shader types before loading any shaders
			InitializeShaderTypes();
		}

		FDelayedAutoRegisterHelper::RunAndClearDelayedAutoRegisterDelegates(EDelayedRegisterRunPhase::ShaderTypesReady);

		SlowTask.EnterProgressFrame(25, LOCTEXT("CompileGlobalShaderMap", "Compiling Global Shaders..."));

		// Load the global shaders
		if (AllowGlobalShaderLoad())
		{
			LLM_SCOPE(ELLMTag::Shaders);
			SCOPED_BOOT_TIMING("CompileGlobalShaderMap");
			CompileGlobalShaderMap(false);
			if (IsEngineExitRequested())
			{
				// This means we can't continue without the global shader map.
				return 1;
			}
		}

		SlowTask.EnterProgressFrame(5);

		{
			SCOPED_BOOT_TIMING("CreateMoviePlayer");
			CreateMoviePlayer();
		}

		if (FPreLoadScreenManager::ArePreLoadScreensEnabled())
		{
			SCOPED_BOOT_TIMING("FPreLoadScreenManager::Create");
			FPreLoadScreenManager::Create();
			ensure(FPreLoadScreenManager::Get());
		}

		// If platforms support early movie playback we have to start the rendering thread much earlier
#if PLATFORM_SUPPORTS_EARLY_MOVIE_PLAYBACK
		{
			SCOPED_BOOT_TIMING("PostInitRHI");
			PostInitRHI();
		}

		if (GUseThreadedRendering)
		{
			if (GRHISupportsRHIThread)
			{
				const bool DefaultUseRHIThread = true;
				GUseRHIThread_InternalUseOnly = DefaultUseRHIThread;
				if (FParse::Param(FCommandLine::Get(), TEXT("rhithread")))
				{
					GUseRHIThread_InternalUseOnly = true;
				}
				else if (FParse::Param(FCommandLine::Get(), TEXT("norhithread")))
				{
					GUseRHIThread_InternalUseOnly = false;
				}
			}
				
			SCOPED_BOOT_TIMING("StartRenderingThread");
			StartRenderingThread();
		}
#endif

		FEmbeddedCommunication::ForceTick(4);

		{
#if !UE_SERVER// && !UE_EDITOR
			if (!IsRunningDedicatedServer() && !IsRunningCommandlet())
			{
				TSharedPtr<FSlateRenderer> SlateRenderer = GUsingNullRHI ?
					FModuleManager::Get().LoadModuleChecked<ISlateNullRendererModule>("SlateNullRenderer").CreateSlateNullRenderer() :
					FModuleManager::Get().GetModuleChecked<ISlateRHIRendererModule>("SlateRHIRenderer").CreateSlateRHIRenderer();
				TSharedRef<FSlateRenderer> SlateRendererSharedRef = SlateRenderer.ToSharedRef();

				{
					SCOPED_BOOT_TIMING("CurrentSlateApp.InitializeRenderer");
					// If Slate is being used, initialize the renderer after RHIInit
					FSlateApplication& CurrentSlateApp = FSlateApplication::Get();
					CurrentSlateApp.InitializeRenderer(SlateRendererSharedRef);
				}

				{
					SCOPED_BOOT_TIMING("FEngineFontServices::Create");
					// Create the engine font services now that the Slate renderer is ready
					FEngineFontServices::Create();
				}

				{
					SCOPED_BOOT_TIMING("LoadModulesForProject(ELoadingPhase::PostSplashScreen)");
					// Load up all modules that need to hook into the custom splash screen
					if (!IProjectManager::Get().LoadModulesForProject(ELoadingPhase::PostSplashScreen) || !IPluginManager::Get().LoadModulesForEnabledPlugins(ELoadingPhase::PostSplashScreen))
					{
						return 1;
					}
				}

				{
					SCOPED_BOOT_TIMING("PlayFirstPreLoadScreen");

					if (FPreLoadScreenManager::Get())
					{
						{
							SCOPED_BOOT_TIMING("PlayFirstPreLoadScreen - FPreLoadScreenManager::Get()->Initialize");
							// initialize and present custom splash screen
							FPreLoadScreenManager::Get()->Initialize(SlateRendererSharedRef.Get());
						}

						if (FPreLoadScreenManager::Get()->HasRegisteredPreLoadScreenType(EPreLoadScreenTypes::CustomSplashScreen))
						{
							FPreLoadScreenManager::Get()->PlayFirstPreLoadScreen(EPreLoadScreenTypes::CustomSplashScreen);
						}
					}
				}

				PreInitContext.SlateRenderer = SlateRenderer;
			}
#endif // !UE_SERVER
		}
	}
#endif // WITH_ENGINE

	// Save PreInitContext
	PreInitContext.bDumpEarlyConfigReads = bDumpEarlyConfigReads;
	PreInitContext.bDumpEarlyPakFileReads = bDumpEarlyPakFileReads;
	PreInitContext.bForceQuitAfterEarlyReads = bForceQuitAfterEarlyReads;
	PreInitContext.bWithConfigPatching = bWithConfigPatching;
	PreInitContext.bHasEditorToken = bHasEditorToken;
#if WITH_ENGINE
	bool bDisableDisregardForGC = bHasEditorToken;
	if (bIsRunningAsDedicatedServer)
	{
		bDisableDisregardForGC |= FPlatformProperties::RequiresCookedData() && (GUseDisregardForGCOnDedicatedServers == 0);
	}
	PreInitContext.bDisableDisregardForGC = bDisableDisregardForGC;
	PreInitContext.bIsRegularClient = bIsRegularClient;
#endif // WITH_ENGINE
	PreInitContext.bIsPossiblyUnrecognizedCommandlet = bIsRegularClient && Token.Len() && !Token.Contains(TEXT("-"));
	PRAGMA_DISABLE_DEPRECATION_WARNINGS;
	PreInitContext.bTokenDoesNotHaveDash = PreInitContext.bIsPossiblyUnrecognizedCommandlet;
	PRAGMA_ENABLE_DEPRECATION_WARNINGS;
	PreInitContext.Token = Token;
#if UE_EDITOR || WITH_ENGINE
	PreInitContext.CommandletCommandLine = CommandletCommandLine;
#endif // UE_EDITOR || WITH_ENGINE
	PreInitContext.CommandLineCopy = CommandLineCopy;
	
	return 0;
}

int32 FEngineLoop::PreInitPostStartupScreen(const TCHAR* CmdLine)
{
	ON_SCOPE_EXIT{ GEnginePreInitPostStartupScreenEndTime = FPlatformTime::Seconds(); };
	SCOPED_BOOT_TIMING("FEngineLoop::PreInitPostStartupScreen");

	if (IsEngineExitRequested())
	{
		return 0;
	}

	FScopeCycleCounter CycleCount_AfterStats(GET_STATID(STAT_FEngineLoop_PreInitPostStartupScreen_AfterStats));

	// Restore PreInitContext
	bool bDumpEarlyConfigReads = PreInitContext.bDumpEarlyConfigReads;
	bool bDumpEarlyPakFileReads = PreInitContext.bDumpEarlyPakFileReads;
	bool bForceQuitAfterEarlyReads = PreInitContext.bForceQuitAfterEarlyReads;
	bool bWithConfigPatching = PreInitContext.bWithConfigPatching;
	bool bHasEditorToken = PreInitContext.bHasEditorToken;
#if WITH_ENGINE
	bool bDisableDisregardForGC = PreInitContext.bDisableDisregardForGC;
	bool bIsRegularClient = PreInitContext.bIsRegularClient;
#endif // WITH_ENGINE
	bool bIsPossiblyUnrecognizedCommandlet = PreInitContext.bIsPossiblyUnrecognizedCommandlet;
	FString Token = PreInitContext.Token;
#if UE_EDITOR || WITH_ENGINE
	const TCHAR* CommandletCommandLine = PreInitContext.CommandletCommandLine;
#endif // UE_EDITOR || WITH_ENGINE
	TCHAR* CommandLineCopy = PreInitContext.CommandLineCopy;
	FScopedSlowTask& SlowTask = *PreInitContext.SlowTaskPtr;

#if WITH_ENGINE
	{
		TSharedPtr<IInstallBundleManager> BundleManager = IInstallBundleManager::GetPlatformInstallBundleManager();

#if !UE_SERVER// && !UE_EDITOR
		if (!IsRunningDedicatedServer() && !IsRunningCommandlet())
		{
			SCOPED_BOOT_TIMING("PreInitPostStartupScreen_StartupGraphics");

			TSharedPtr<FSlateRenderer> SlateRenderer = PreInitContext.SlateRenderer;
			TSharedRef<FSlateRenderer> SlateRendererSharedRef = SlateRenderer.ToSharedRef();
			{
				SCOPED_BOOT_TIMING("GetMoviePlayer()->SetupLoadingScreenFromIni");
				// allow the movie player to load a sequence from the .inis (a PreLoadingScreen module could have already initialized a sequence, in which case
				// it wouldn't have anything in it's .ini file)
				GetMoviePlayer()->SetupLoadingScreenFromIni();
			}

			{
				SCOPED_BOOT_TIMING("LoadModulesForProject(ELoadingPhase::PreEarlyLoadingScreen)");
				// Load up all modules that need to hook into the loading screen
				if (!IProjectManager::Get().LoadModulesForProject(ELoadingPhase::PreEarlyLoadingScreen) || !IPluginManager::Get().LoadModulesForEnabledPlugins(ELoadingPhase::PreEarlyLoadingScreen))
				{
					return 1;
				}
			}

			if (BundleManager != nullptr && !BundleManager->IsNullInterface())
			{
				IInstallBundleManager::InstallBundleCompleteDelegate.AddStatic(
					&OnStartupContentMounted, bDumpEarlyConfigReads, bDumpEarlyPakFileReads, bWithConfigPatching, bForceQuitAfterEarlyReads);
			}
			// If not using the bundle manager, config will be reloaded after ESP, see below

			if (GetMoviePlayer()->HasEarlyStartupMovie())
			{
				SCOPED_BOOT_TIMING("EarlyStartupMovie");
				GetMoviePlayer()->Initialize(SlateRendererSharedRef.Get(), FPreLoadScreenManager::Get() ? FPreLoadScreenManager::Get()->GetRenderWindow() : nullptr);

				// hide splash screen now before playing any movies
				FPlatformMisc::PlatformHandleSplashScreen(false);

				// only allowed to play any movies marked as early startup.  These movies or widgets can have no interaction whatsoever with uobjects or engine features
				GetMoviePlayer()->PlayEarlyStartupMovies();

				// display the splash screen again now that early startup movies have played
				FPlatformMisc::PlatformHandleSplashScreen(true);

#if 0 && PAK_TRACKER// dump the files which have been accessed inside the pak file
				FPakPlatformFile* PakPlatformFile = (FPakPlatformFile*)(FPlatformFileManager::Get().FindPlatformFile(FPakPlatformFile::GetTypeName()));
				FString FileList = TEXT("All files accessed before init\n");
				for (const auto& PakMapFile : PakPlatformFile->GetPakMap())
				{
					FileList += PakMapFile.Key + TEXT("\n");
				}
				UE_LOG(LogInit, Display, TEXT("\n%s"), *FileList);
#endif

#if 0 && CONFIG_REMEMBER_ACCESS_PATTERN

				TArray<FString> ConfigFilenames;
				GConfig->GetConfigFilenames(ConfigFilenames);
				for (const FString& ConfigFilename : ConfigFilenames)
				{
					const FConfigFile* Config = GConfig->FindConfigFile(ConfigFilename);

					for (auto& ConfigSection : *Config)
					{
						TSet<FName> ProcessedValues;
						const FName SectionName = FName(*ConfigSection.Key);

						for (auto& ConfigValue : ConfigSection.Value)
						{
							const FName& ValueName = ConfigValue.Key;
							if (ProcessedValues.Contains(ValueName))
								continue;

							ProcessedValues.Add(ValueName);

							TArray<FConfigValue> ValueArray;
							ConfigSection.Value.MultiFind(ValueName, ValueArray, true);

							bool bHasBeenAccessed = false;
							for (const auto& ValueArrayEntry : ValueArray)
							{
								if (ValueArrayEntry.HasBeenRead())
								{
									bHasBeenAccessed = true;
									break;
								}
							}

							if (bHasBeenAccessed)
							{
								UE_LOG(LogInit, Display, TEXT("Accessed Ini Setting %s %s %s"), *ConfigFilename, *SectionName.ToString(), *ValueName.ToString());
							}

						}
					}

				}
#endif
			}
			else
			{
				SCOPED_BOOT_TIMING("PlayFirstPreLoadScreen");

				if (FPreLoadScreenManager::Get())
				{
					SCOPED_BOOT_TIMING("PlayFirstPreLoadScreen - FPreLoadScreenManager::Get()->Initialize");
					// initialize and play our first Early PreLoad Screen if one is setup
					FPreLoadScreenManager::Get()->Initialize(SlateRendererSharedRef.Get());

					if (FPreLoadScreenManager::Get()->HasRegisteredPreLoadScreenType(EPreLoadScreenTypes::EarlyStartupScreen))
					{
						// disable the splash before playing the early startup screen
						FPreLoadScreenManager::Get()->IsResponsibleForRenderingDelegate.AddLambda(
							[](bool bIsPreloadScreenManResponsibleForRendering)
							{
								FPlatformMisc::PlatformHandleSplashScreen(!bIsPreloadScreenManResponsibleForRendering);
							}
						);
						FPreLoadScreenManager::Get()->PlayFirstPreLoadScreen(EPreLoadScreenTypes::EarlyStartupScreen);
					}
					else
					{
						// no early startup screen, show the splash screen
						FPlatformMisc::PlatformHandleSplashScreen(true);
					}
				}
				else
				{
					// no preload manager, show the splash screen
					FPlatformMisc::PlatformHandleSplashScreen(true);
				}
			}
		}
		else if (IsRunningCommandlet())
		{
			// Create the engine font services now that the Slate renderer is ready
			FEngineFontServices::Create();
		}
#endif //!UE_SERVER

		//Now that our EarlyStartupScreen is finished, lets take the necessary steps to mount paks, apply .ini cvars, and open the shader libraries if we installed content we expect to handle
		//If using a bundle manager, assume its handling all this stuff and that we don't have to do it.
		if (BundleManager == nullptr || BundleManager->IsNullInterface() || !BundleManager->SupportsEarlyStartupPatching())
		{
			// Mount Paks that were installed during EarlyStartupScreen
			if (FCoreDelegates::OnMountAllPakFiles.IsBound() && FPaths::HasProjectPersistentDownloadDir() )
			{
				SCOPED_BOOT_TIMING("MountPaksAfterEarlyStartupScreen");

				FString InstalledGameContentDir = FPaths::Combine(*FPaths::ProjectPersistentDownloadDir(), TEXT("InstalledContent"), FApp::GetProjectName(), TEXT("Content"), TEXT("Paks"));
				FPlatformMisc::AddAdditionalRootDirectory(FPaths::Combine(*FPaths::ProjectPersistentDownloadDir(), TEXT("InstalledContent")));

				TArray<FString> PakFolders;
				PakFolders.Add(InstalledGameContentDir);
				FCoreDelegates::OnMountAllPakFiles.Execute(PakFolders);

				// Look for any plugins installed during EarlyStartupScreen
				IPluginManager::Get().RefreshPluginsList();
				IPluginManager::Get().LoadModulesForEnabledPlugins(ELoadingPhase::PreEarlyLoadingScreen);
			}

			DumpEarlyReads(bDumpEarlyConfigReads, bDumpEarlyPakFileReads, bForceQuitAfterEarlyReads);

			//Reapply CVars after our EarlyLoadScreen
			if(bWithConfigPatching)
			{
				SCOPED_BOOT_TIMING("ReapplyCVarsFromIniAfterEarlyStartupScreen");
				HandleConfigReload(bWithConfigPatching);
			}

			//Handle opening shader library after our EarlyLoadScreen
			{
				LLM_SCOPE(ELLMTag::Shaders);
				SCOPED_BOOT_TIMING("FShaderCodeLibrary::OpenLibrary");

				// Open the game library which contains the material shaders.
				FShaderCodeLibrary::OpenLibrary(FApp::GetProjectName(), FPaths::ProjectContentDir());
				for (const FString& RootDir : FPlatformMisc::GetAdditionalRootDirectories())
				{
					FShaderCodeLibrary::OpenLibrary(FApp::GetProjectName(), FPaths::Combine(RootDir, FApp::GetProjectName(), TEXT("Content")));
				}

				// Now our shader code main library is opened, kick off the precompile, if already initialized
				FShaderPipelineCache::OpenPipelineFileCache(GMaxRHIShaderPlatform);
			}
		}
#if WITH_EDITOR
		else if (GAllowCookedDataInEditorBuilds)
		{
			//Handle opening shader library after our EarlyLoadScreen
			{
				LLM_SCOPE(ELLMTag::Shaders);
				SCOPED_BOOT_TIMING("FShaderCodeLibrary::OpenLibrary");

				// Open the game library which contains the material shaders.
				FShaderCodeLibrary::OpenLibrary(FApp::GetProjectName(), FPaths::ProjectContentDir());
			}
		}
#endif

		BeginInitGameTextLocalization();

		DECLARE_SCOPE_CYCLE_COUNTER(TEXT("Initial UObject load"), STAT_InitialUObjectLoad, STATGROUP_LoadTime);

		// In order to be able to use short script package names get all script
		// package names from ini files and register them with FPackageName system.
		FPackageName::RegisterShortPackageNamesForUObjectModules();

		SlowTask.EnterProgressFrame(5);


		{
		    SCOPED_BOOT_TIMING("LoadAssetRegistryModule");
		    // If we don't do this now and the async loading thread is active, then we will attempt to load this module from a thread
		    FModuleManager::Get().LoadModule("AssetRegistry");
		}
#if WITH_COREUOBJECT
		// Initialize the PackageResourceManager, which is needed to load any (non-script) Packages. It is first used in ProcessNewlyLoadedObjects (due to the loading of asset references in Class Default Objects)
		// It has to be intialized after the AssetRegistryModule; the editor implementations of PackageResourceManager relies on it
		IPackageResourceManager::Initialize();
#endif
#if WITH_EDITOR
		// Initialize the BulkDataRegistry, which registers BulkData structs loaded from Packages for later building. It uses the same lifetime as IPackageResourceManager
		IBulkDataRegistry::Initialize();
#endif

		FEmbeddedCommunication::ForceTick(5);

		// for any auto-registered functions that want to wait until main(), run them now
		// @todo loadtime: this should have phases, so caller can decide when auto-register runs [use plugin phases probably?]
		FDelayedAutoRegisterHelper::RunAndClearDelayedAutoRegisterDelegates(EDelayedRegisterRunPhase::PreObjectSystemReady);

		// Make sure all UObject classes are registered and default properties have been initialized
		ProcessNewlyLoadedUObjects();

		EndInitGameTextLocalization();

		FDelayedAutoRegisterHelper::RunAndClearDelayedAutoRegisterDelegates(EDelayedRegisterRunPhase::ObjectSystemReady);

		FEmbeddedCommunication::ForceTick(6);

#if WITH_EDITOR
		if(FPIEPreviewDeviceModule::IsRequestingPreviewDevice())
		{
			auto PIEPreviewDeviceModule = FModuleManager::LoadModulePtr<IPIEPreviewDeviceModule>("PIEPreviewDeviceProfileSelector");
			if (PIEPreviewDeviceModule)
			{
				PIEPreviewDeviceModule->ApplyPreviewDeviceState();
			}
		}
#endif
#if USE_LOCALIZED_PACKAGE_CACHE
		{
			SCOPED_BOOT_TIMING("FPackageLocalizationManager::Get().PerformLazyInitialization()");
			// CoreUObject is definitely available now, so make sure the package localization cache is available
			// This may have already been initialized from the CDO creation from ProcessNewlyLoadedUObjects
			FPackageLocalizationManager::Get().PerformLazyInitialization();
		}
#endif	// USE_LOCALIZED_PACKAGE_CACHE

		{
			SCOPED_BOOT_TIMING("InitDefaultMaterials etc");
			// Default materials may have been loaded due to dependencies when loading
			// classes and class default objects. If not, do so now.
			UMaterialInterface::InitDefaultMaterials();
			UMaterialInterface::AssertDefaultMaterialsExist();
			UMaterialInterface::AssertDefaultMaterialsPostLoaded();
		}
	}

	{
		SCOPED_BOOT_TIMING("IStreamingManager::Get()");
		// Initialize the texture streaming system (needs to happen after RHIInit and ProcessNewlyLoadedUObjects).
		IStreamingManager::Get();
	}

	SlowTask.EnterProgressFrame(5);

	// Tell the module manager is may now process newly-loaded UObjects when new C++ modules are loaded
	FModuleManager::Get().StartProcessingNewlyLoadedObjects();

	FEmbeddedCommunication::ForceTick(7);

	// Setup GC optimizations
	if (bDisableDisregardForGC)
	{
		SCOPED_BOOT_TIMING("DisableDisregardForGC");
		GUObjectArray.DisableDisregardForGC();
	}

	SlowTask.EnterProgressFrame(10);

	{
		SCOPED_BOOT_TIMING("LoadStartupCoreModules");
		if (!LoadStartupCoreModules())
		{
			// At least one startup module failed to load, return 1 to indicate an error
			return 1;
		}
	}


	SlowTask.EnterProgressFrame(10);

	{
		SCOPED_BOOT_TIMING("IProjectManager::Get().LoadModulesForProject(ELoadingPhase::PreLoadingScreen)");
		// Load up all modules that need to hook into the loading screen
		if (!IProjectManager::Get().LoadModulesForProject(ELoadingPhase::PreLoadingScreen) || !IPluginManager::Get().LoadModulesForEnabledPlugins(ELoadingPhase::PreLoadingScreen))
		{
			return 1;
		}
	}

#if !UE_SERVER
    //See if we have an engine loading PreLoadScreen registered, if not try to play an engine loading movie as a backup.
    if (!IsRunningDedicatedServer() && !IsRunningCommandlet() && !GetMoviePlayer()->IsMovieCurrentlyPlaying())
    {
		SCOPED_BOOT_TIMING("FPreLoadScreenManager::Get()->Initialize etc");
		if (FSlateRenderer* Renderer = FSlateApplication::Get().GetRenderer())
        {
            if (FPreLoadScreenManager::Get())
            {
                if (FPreLoadScreenManager::Get()->HasRegisteredPreLoadScreenType(EPreLoadScreenTypes::EngineLoadingScreen))
                {
                    FPreLoadScreenManager::Get()->Initialize(*Renderer);
                }
                else
                {
                    //If we don't have a PreLoadScreen to show, try and initialize old flow with the movie player.
                    GetMoviePlayer()->Initialize(*Renderer, FPreLoadScreenManager::Get()->GetRenderWindow());
                }
            }
            else
            {
                GetMoviePlayer()->Initialize(*Renderer, nullptr);
            }
        }
    }
#endif

	{
		SCOPED_BOOT_TIMING("FPlatformApplicationMisc::PostInit");
		// do any post appInit processing, before the render thread is started.
		FPlatformApplicationMisc::PostInit();
	}
	SlowTask.EnterProgressFrame(5);

#if !PLATFORM_SUPPORTS_EARLY_MOVIE_PLAYBACK
	{
		SCOPED_BOOT_TIMING("PostInitRHI etc");
		PostInitRHI();

		if (GUseThreadedRendering)
		{
			if (GRHISupportsRHIThread)
			{
				const bool DefaultUseRHIThread = true;
				GUseRHIThread_InternalUseOnly = DefaultUseRHIThread;
				if (FParse::Param(FCommandLine::Get(), TEXT("rhithread")))
				{
					GUseRHIThread_InternalUseOnly = true;
				}
				else if (FParse::Param(FCommandLine::Get(), TEXT("norhithread")))
				{
					GUseRHIThread_InternalUseOnly = false;
				}
			}
			StartRenderingThread();
		}
	}
#endif // !PLATFORM_SUPPORTS_EARLY_MOVIE_PLAYBACK

	// Playing a movie can only happen after the rendering thread is started.
#if !UE_SERVER// && !UE_EDITOR
	if (!IsRunningDedicatedServer() && !IsRunningCommandlet() && !GetMoviePlayer()->IsMovieCurrentlyPlaying())
	{
		SCOPED_BOOT_TIMING("PlayFirstPreLoadScreen etc");
		if (FPreLoadScreenManager::Get() && FPreLoadScreenManager::Get()->HasRegisteredPreLoadScreenType(EPreLoadScreenTypes::EngineLoadingScreen))
        {
            FPreLoadScreenManager::Get()->PlayFirstPreLoadScreen(EPreLoadScreenTypes::EngineLoadingScreen);
			FPreLoadScreenManager::Get()->SetEngineLoadingComplete(false);
        }
        else
        {
            // Play any non-early startup loading movies.
            GetMoviePlayer()->PlayMovie();
        }
	}
#endif
	{
		SCOPED_BOOT_TIMING("PlatformHandleSplashScreen etc");
#if !UE_SERVER
		if (!IsRunningDedicatedServer())
		{
			// show or hide splash screen based on movie
			FPlatformMisc::PlatformHandleSplashScreen(!GetMoviePlayer()->IsMovieCurrentlyPlaying());
		}
		else
#endif
		{
			// show splash screen
			FPlatformMisc::PlatformHandleSplashScreen(true);
		}
	}

	if(!GIsEditor)
	{
		FCoreUObjectDelegates::PreGarbageCollectConditionalBeginDestroy.AddStatic(StartRenderCommandFenceBundler);
		FCoreUObjectDelegates::PostGarbageCollectConditionalBeginDestroy.AddStatic(StopRenderCommandFenceBundler);
	}

#if WITH_EDITOR
	// We need to mount the shared resources for templates (if there are any) before we try and load and game classes
	FUnrealEdMisc::Get().MountTemplateSharedPaths();
#endif

	{
		SCOPED_BOOT_TIMING("LoadStartupModules");
		if (!LoadStartupModules())
		{
			// At least one startup module failed to load, return 1 to indicate an error
			return 1;
		}
	}
#else // !WITH_ENGINE
#if WITH_COREUOBJECT
	// Initialize the PackageResourceManager, which is needed to load any (non-script) Packages.
	IPackageResourceManager::Initialize();
#endif
#endif // WITH_ENGINE

#if WITH_COREUOBJECT
	if (GUObjectArray.IsOpenForDisregardForGC())
	{
		SCOPED_BOOT_TIMING("CloseDisregardForGC");
		GUObjectArray.CloseDisregardForGC();
	}
	NotifyRegistrationComplete();
	FReferencerFinder::NotifyRegistrationComplete();
#endif // WITH_COREUOBJECT

#if WITH_ENGINE
	if (UOnlineEngineInterface::Get()->IsLoaded())
	{
		SetIsServerForOnlineSubsystemsDelegate(FQueryIsRunningServer::CreateStatic(&IsServerDelegateForOSS));
	}

	SlowTask.EnterProgressFrame(5);

	if (!bHasEditorToken && !IsRunningDedicatedServer())
	{
		UClass* CommandletClass = nullptr;

		if (!bIsRegularClient)
		{
			checkf(PRIVATE_GIsRunningCommandlet, TEXT("This should have been set in PreInitPreStartupScreen"));

			CommandletClass = Cast<UClass>(StaticFindFirstObject(UClass::StaticClass(), *Token, EFindFirstObjectOptions::None, ELogVerbosity::Warning, TEXT("looking for commandlet")));
			int32 PeriodIdx;
			if (!CommandletClass && Token.FindChar('.', PeriodIdx))
			{
				// try to load module for commandlet specified before a period.
				FModuleManager::Get().LoadModule(*Token.Left(PeriodIdx));
				CommandletClass = FindFirstObject<UClass>(*Token, EFindFirstObjectOptions::None, ELogVerbosity::Warning, TEXT("Looking for commandlet class"));
			}
			if (!CommandletClass)
			{
				if (GLogConsole && !GIsSilent)
				{
					GLogConsole->Show(true);
				}
				UE_LOG(LogInit, Error, TEXT("%s looked like a commandlet, but we could not find the class."), *Token);
				RequestEngineExit(FString::Printf(TEXT("Failed to find commandlet class %s"), *Token));
				return 1;
			}

#if PLATFORM_WINDOWS || PLATFORM_MAC || PLATFORM_UNIX
			extern bool GIsConsoleExecutable;
			if (GIsConsoleExecutable)
			{
				if (GLogConsole != nullptr && GLogConsole->IsAttached())
				{
					GLog->RemoveOutputDevice(GLogConsole);
				}
				// Setup Ctrl-C handler for console application
				FPlatformMisc::SetGracefulTerminationHandler();
			}
			else
#endif
			{
				// Bring up console unless we're a silent build.
				if( GLogConsole && !GIsSilent )
				{
					GLogConsole->Show( true );
				}
			}

			// print output immediately
			setvbuf(stdout, nullptr, _IONBF, 0);

			UE_LOG(LogInit, Log,  TEXT("Executing %s"), *CommandletClass->GetFullName() );

			// Allow commandlets to individually override those settings.
			UCommandlet* Default = CastChecked<UCommandlet>(CommandletClass->GetDefaultObject());

			if ( IsEngineExitRequested() )
			{
				// commandlet set IsEngineExitRequested() during construction
				return 1;
			}

			GIsClient = Default->IsClient;
			GIsServer = Default->IsServer;
#if WITH_EDITOR
			GIsEditor = Default->IsEditor;
#else
			if (Default->IsEditor)
			{
				UE_LOG(LogInit, Error, TEXT("Cannot run editor commandlet %s with game executable."), *CommandletClass->GetFullName());
				RequestEngineExit(TEXT("Tried to run commandlet in non-editor build"));
				return 1;
			}
#endif
			// Reset aux log if we don't want to log to the console window.
			if( !Default->LogToConsole )
			{
				GLog->RemoveOutputDevice( GLogConsole );
			}

			// allow the commandlet the opportunity to create a custom engine
			CommandletClass->GetDefaultObject<UCommandlet>()->CreateCustomEngine(CommandletCommandLine);
			if ( GEngine == nullptr )
			{
#if WITH_EDITOR
				if ( GIsEditor )
				{
					FString EditorEngineClassName;
					GConfig->GetString(TEXT("/Script/Engine.Engine"), TEXT("EditorEngine"), EditorEngineClassName, GEngineIni);
					UClass* EditorEngineClass = StaticLoadClass( UEditorEngine::StaticClass(), nullptr, *EditorEngineClassName);
					if (EditorEngineClass == nullptr)
					{
						UE_LOG(LogInit, Fatal, TEXT("Failed to load Editor Engine class '%s'."), *EditorEngineClassName);
					}

					GEngine = GEditor = NewObject<UEditorEngine>(GetTransientPackage(), EditorEngineClass);

					GEngine->ParseCommandline();

					UE_LOG(LogInit, Log, TEXT("Initializing Editor Engine..."));
					GEditor->InitEditor(this);
					UE_LOG(LogInit, Log, TEXT("Initializing Editor Engine Completed"));
				}
				else
#endif
				{
					FString GameEngineClassName;
					GConfig->GetString(TEXT("/Script/Engine.Engine"), TEXT("GameEngine"), GameEngineClassName, GEngineIni);

					UClass* EngineClass = StaticLoadClass( UEngine::StaticClass(), nullptr, *GameEngineClassName);

					if (EngineClass == nullptr)
					{
						UE_LOG(LogInit, Fatal, TEXT("Failed to load Engine class '%s'."), *GameEngineClassName);
					}

					// must do this here so that the engine object that we create on the next line receives the correct property values
					GEngine = NewObject<UEngine>(GetTransientPackage(), EngineClass);
					check(GEngine);

					GEngine->ParseCommandline();

					UE_LOG(LogInit, Log, TEXT("Initializing Game Engine..."));
					GEngine->Init(this);
					UE_LOG(LogInit, Log, TEXT("Initializing Game Engine Completed"));
				}
			}

			// Call init callbacks
			FCoreDelegates::OnPostEngineInit.Broadcast();

			// Load all the post-engine init modules
			ensure(IProjectManager::Get().LoadModulesForProject(ELoadingPhase::PostEngineInit));
			ensure(IPluginManager::Get().LoadModulesForEnabledPlugins(ELoadingPhase::PostEngineInit));

			// Call module loading phases completion callbacks
			FCoreDelegates::OnAllModuleLoadingPhasesComplete.Broadcast();

			//run automation smoke tests now that the commandlet has had a chance to override the above flags and GEngine is available
			FAutomationTestFramework::Get().RunSmokeTests();

			UCommandlet* Commandlet = NewObject<UCommandlet>(GetTransientPackage(), CommandletClass);
			check(Commandlet);
			Commandlet->AddToRoot();

			// Execute the commandlet.
			double CommandletExecutionStartTime = FPlatformTime::Seconds();

			// Commandlets don't always handle -run= properly in the commandline so we'll provide them
			// with a custom version that doesn't have it.
			Commandlet->ParseParms( CommandletCommandLine );
#if	STATS
			// We have to close the scope, otherwise we will end with broken stats.
			CycleCount_AfterStats.StopAndResetStatId();
#endif // STATS
			FStats::TickCommandletStats();

#if WITH_ENGINE
			PRIVATE_GRunningCommandletClass = CommandletClass;
#endif
			int32 ErrorLevel = Commandlet->Main( CommandletCommandLine );
#if WITH_ENGINE
			PRIVATE_GRunningCommandletClass = nullptr;
#endif

			FStats::TickCommandletStats();

			RequestEngineExit(FString::Printf(TEXT("Commandlet %s finished execution (result %d)"), *Commandlet->GetName(), ErrorLevel));

			// Log warning/ error summary.
			if( Commandlet->ShowErrorCount )
			{
				TArray<FString> AllErrors;
				TArray<FString> AllWarnings;
				GWarn->GetErrors(AllErrors);
				GWarn->GetWarnings(AllWarnings);

				if (AllErrors.Num() || AllWarnings.Num())
				{
					SET_WARN_COLOR(COLOR_WHITE);
					UE_LOG(LogInit, Display, TEXT(""));
					UE_LOG(LogInit, Display, TEXT("Warning/Error Summary (Unique only)"));
					UE_LOG(LogInit, Display, TEXT("-----------------------------------"));

					const int32 MaxMessagesToShow = (GIsBuildMachine || FParse::Param(FCommandLine::Get(), TEXT("DUMPALLWARNINGS"))) ?
						(AllErrors.Num() + AllWarnings.Num()) : 50;

					TSet<FString> ShownMessages;
					ShownMessages.Empty(MaxMessagesToShow);

					SET_WARN_COLOR(COLOR_RED);

					for (const FString& ErrorMessage : AllErrors)
					{
						bool bAlreadyShown = false;
						ShownMessages.Add(ErrorMessage, &bAlreadyShown);

						if (!bAlreadyShown)
						{
							if (ShownMessages.Num() > MaxMessagesToShow)
							{
								SET_WARN_COLOR(COLOR_WHITE);
								UE_CLOG(MaxMessagesToShow < AllErrors.Num(), LogInit, Display, TEXT("NOTE: Only first %d errors displayed."), MaxMessagesToShow);
								break;
							}

							UE_LOG(LogInit, Display, TEXT("%s"), *ErrorMessage);
						}
					}

					SET_WARN_COLOR(COLOR_YELLOW);
					ShownMessages.Empty(MaxMessagesToShow);

					for (const FString& WarningMessage : AllWarnings)
					{
						bool bAlreadyShown = false;
						ShownMessages.Add(WarningMessage, &bAlreadyShown);

						if (!bAlreadyShown)
						{
							if (ShownMessages.Num() > MaxMessagesToShow)
							{
								SET_WARN_COLOR(COLOR_WHITE);
								UE_CLOG(MaxMessagesToShow < AllWarnings.Num(), LogInit, Display, TEXT("NOTE: Only first %d warnings displayed."), MaxMessagesToShow);
								break;
							}

							UE_LOG(LogInit, Display, TEXT("%s"), *WarningMessage);
						}
					}
				}

				UE_LOG(LogInit, Display, TEXT(""));

				if( ErrorLevel != 0 )
				{
					SET_WARN_COLOR(COLOR_RED);
					UE_LOG(LogInit, Display, TEXT("Commandlet->Main return this error code: %d"), ErrorLevel );
					UE_LOG(LogInit, Display, TEXT("With %d error(s), %d warning(s)"), AllErrors.Num(), AllWarnings.Num() );
				}
				else if( ( AllErrors.Num() == 0 ) )
				{
					SET_WARN_COLOR(AllWarnings.Num() ? COLOR_YELLOW : COLOR_GREEN);
					UE_LOG(LogInit, Display, TEXT("Success - %d error(s), %d warning(s)"), AllErrors.Num(), AllWarnings.Num() );
				}
				else
				{
					SET_WARN_COLOR(COLOR_RED);
					UE_LOG(LogInit, Display, TEXT("Failure - %d error(s), %d warning(s)"), AllErrors.Num(), AllWarnings.Num() );
					ErrorLevel = 1;
				}
				CLEAR_WARN_COLOR();
			}
			else
			{
				UE_LOG(LogInit, Display, TEXT("Finished.") );
			}

			double CommandletExecutionTime = FPlatformTime::Seconds() - CommandletExecutionStartTime;
			UE_LOG(LogInit, Display, LINE_TERMINATOR TEXT( "Execution of commandlet took:  %.2f seconds"), CommandletExecutionTime );

			// We're ready to exit!
			return ErrorLevel;
		}
		else
		{
			// We're a regular client.
			check(bIsRegularClient);

			if (bIsPossiblyUnrecognizedCommandlet)
			{
				// here we give people a reasonable warning if they tried to use the short name of a commandlet
				UClass* TempCommandletClass = FindFirstObject<UClass>(*(Token + TEXT("Commandlet")), EFindFirstObjectOptions::None, ELogVerbosity::Warning, TEXT("Looking for commandlet class"));
				if (TempCommandletClass)
				{
					UE_LOG(LogInit, Fatal, TEXT("You probably meant to call a commandlet. Please use the full name %s."), *(Token+TEXT("Commandlet")));
				}
			}
		}
	}

	// exit if wanted.
	if( IsEngineExitRequested() )
	{
		if ( GEngine != nullptr )
		{
			GEngine->PreExit();
		}
		AppPreExit();
		// appExit is called outside guarded block.
		return 1;
	}

	FEmbeddedCommunication::ForceTick(8);

	if(FParse::Param(FCommandLine::Get(),TEXT("DUMPMOVIE")))
	{
		// -1: remain on
		GIsDumpingMovie = -1;
	}

	// If dumping movie then we do NOT want on-screen messages
	GAreScreenMessagesEnabled = !GIsDumpingMovie && !GIsDemoMode;

#if !UE_BUILD_SHIPPING
	if (FParse::Param(FCommandLine::Get(),TEXT("NOSCREENMESSAGES")))
	{
		GAreScreenMessagesEnabled = false;
	}

	if (GEngine && FParse::Param(FCommandLine::Get(), TEXT("statunit")))
	{
		GEngine->Exec(nullptr, TEXT("stat unit"));
	}

	// Don't update INI files if benchmarking or -noini
	if( FApp::IsBenchmarking() || FParse::Param(FCommandLine::Get(),TEXT("NOINI")))
	{
		GConfig->Detach( GEngineIni );
		GConfig->Detach( GInputIni );
		GConfig->Detach( GGameIni );
		GConfig->Detach( GEditorIni );
	}
#endif // !UE_BUILD_SHIPPING

	// initialize the pointer, as it is deleted before being assigned in the first frame
	PendingCleanupObjects = nullptr;

	// Initialize profile visualizers.
#if !(UE_BUILD_SHIPPING || UE_BUILD_TEST)
	FModuleManager::Get().LoadModule(TEXT("TaskGraph"));
	if (FPlatformProcess::SupportsMultithreading())
	{
		FModuleManager::Get().LoadModule(TEXT("ProfilerService"));
		FModuleManager::Get().GetModuleChecked<IProfilerServiceModule>("ProfilerService").CreateProfilerServiceManager();
	}
#endif

	// Init HighRes screenshot system, unless running on server
	if (!IsRunningDedicatedServer())
	{
		GetHighResScreenshotConfig().Init();
	}

#else // WITH_ENGINE
	InitEngineTextLocalization();
	InitGameTextLocalization();
#if USE_LOCALIZED_PACKAGE_CACHE
	{
		SCOPED_BOOT_TIMING("FPackageLocalizationManager::Get().InitializeFromDefaultCache");
		FPackageLocalizationManager::Get().InitializeFromDefaultCache();
	}
#endif	// USE_LOCALIZED_PACKAGE_CACHE
#if WITH_APPLICATION_CORE
	{
		SCOPED_BOOT_TIMING("FPlatformApplicationMisc::PostInit");
		FPlatformApplicationMisc::PostInit();
	}
#endif
#endif // WITH_ENGINE

	{
		SCOPED_BOOT_TIMING("RunSmokeTests");
		//run automation smoke tests now that everything is setup to run
		FAutomationTestFramework::Get().RunSmokeTests();
	}

	FEmbeddedCommunication::ForceTick(9);

	PreInitContext.Cleanup();

	// Note we still have 20% remaining on the slow task: this will be used by the Editor/Engine initialization next
	return 0;
}

int32 FEngineLoop::PreInit(const TCHAR* CmdLine)
{
	const int32 rv1 = PreInitPreStartupScreen(CmdLine);
	if (rv1 != 0)
	{
		PreInitContext.Cleanup();
		return rv1;
	}

	const int32 rv2 = PreInitPostStartupScreen(CmdLine);
	if (rv2 != 0)
	{
		PreInitContext.Cleanup();
		return rv2;
	}

	return 0;
}


bool FEngineLoop::LoadCoreModules()
{
	// Always attempt to load CoreUObject. It requires additional pre-init which is called from its module's StartupModule method.
#if WITH_COREUOBJECT
#if USE_PER_MODULE_UOBJECT_BOOTSTRAP // otherwise do it later
	FModuleManager::Get().OnProcessLoadedObjectsCallback().AddStatic(ProcessNewlyLoadedUObjects);
#endif
	return FModuleManager::Get().LoadModule(TEXT("CoreUObject")) != nullptr;
#else
	return true;
#endif
}


void FEngineLoop::CleanupPreInitContext()
{
	PreInitContext.Cleanup();
}

void FEngineLoop::LoadPreInitModules()
{
	DECLARE_SCOPE_CYCLE_COUNTER(TEXT("Loading PreInit Modules"), STAT_PreInitModules, STATGROUP_LoadTime);

	// GGetMapNameDelegate is initialized here
#if WITH_ENGINE
	FModuleManager::Get().LoadModule(TEXT("Engine"));

	FModuleManager::Get().LoadModule(TEXT("Renderer"));

	FModuleManager::Get().LoadModule(TEXT("AnimGraphRuntime"));

	FPlatformApplicationMisc::LoadPreInitModules();

#if !UE_SERVER
	if (!IsRunningDedicatedServer() )
	{
		if (!GUsingNullRHI)
		{
			// This needs to be loaded before InitializeShaderTypes is called
			FModuleManager::Get().LoadModuleChecked<ISlateRHIRendererModule>("SlateRHIRenderer");
		}
	}
#endif

	FModuleManager::Get().LoadModule(TEXT("Landscape"));

	// Initialize ShaderCore before loading or compiling any shaders,
	// But after Renderer and any other modules which implement shader types.
	FModuleManager::Get().LoadModule(TEXT("RenderCore"));

#if WITH_EDITORONLY_DATA
	// Load the texture compressor module before any textures load. They may
	// compress asynchronously and that can lead to a race condition.
	FModuleManager::Get().LoadModule(TEXT("TextureCompressor"));
#endif

	if (!FPlatformProperties::RequiresCookedData())
	{
		FModuleManager::Get().LoadModule(TEXT("Virtualization"));
	}
#endif // WITH_ENGINE

#if (WITH_EDITOR && !(UE_BUILD_SHIPPING || UE_BUILD_TEST))
	// Load audio editor module before engine class CDOs are loaded
	FModuleManager::Get().LoadModule(TEXT("AudioEditor"));
	FModuleManager::Get().LoadModule(TEXT("AnimationModifiers"));
#endif	
}


#if WITH_ENGINE

bool FEngineLoop::LoadStartupCoreModules()
{
	FScopedSlowTask SlowTask(100);

	DECLARE_SCOPE_CYCLE_COUNTER(TEXT("Loading Startup Modules"), STAT_StartupModules, STATGROUP_LoadTime);

	bool bSuccess = true;

	// Load all Runtime modules
	SlowTask.EnterProgressFrame(10);
	{
		FModuleManager::Get().LoadModule(TEXT("Core"));
		FModuleManager::Get().LoadModule(TEXT("Networking"));
	}

	SlowTask.EnterProgressFrame(10);
	FPlatformApplicationMisc::LoadStartupModules();

	// initialize messaging
	SlowTask.EnterProgressFrame(10);
	if (FPlatformProcess::SupportsMultithreading())
	{
		FModuleManager::LoadModuleChecked<IMessagingModule>("Messaging");
	}

	// Init Scene Reconstruction support
#if !UE_SERVER
	if (!IsRunningDedicatedServer())
	{
		FModuleManager::LoadModuleChecked<IMRMeshModule>("MRMesh");
	}
#endif

	SlowTask.EnterProgressFrame(10);
#if WITH_EDITOR
	FModuleManager::Get().LoadModuleChecked("UnrealEd");
	FModuleManager::Get().LoadModuleChecked("LandscapeEditorUtilities");
	FModuleManager::Get().LoadModuleChecked("SubobjectDataInterface");
#endif //WITH_EDITOR

	// Load UI modules
	SlowTask.EnterProgressFrame(10);
	if ( !IsRunningDedicatedServer() )
	{
		FModuleManager::Get().LoadModule("SlateCore");
		FModuleManager::Get().LoadModule("Slate");

#if !UE_BUILD_SHIPPING
		// Need to load up the SlateReflector module to initialize the WidgetSnapshotService
		FModuleManager::Get().LoadModule("SlateReflector");
#endif // !UE_BUILD_SHIPPING
	}

#if WITH_EDITOR
	FModuleManager::Get().LoadModule("EditorStyle");
	// In dedicated server builds with the editor, we need to load UMG/UMGEditor for compiling blueprints.
	// UMG must be loaded for runtime and cooking.
	FModuleManager::Get().LoadModule("UMG");
#else
	if ( !IsRunningDedicatedServer() )
	{
		// UMG must be loaded for runtime and cooking.
		FModuleManager::Get().LoadModule("UMG");
	}
#endif //WITH_EDITOR

	// Load all Development modules
	SlowTask.EnterProgressFrame(20);
	if (!IsRunningDedicatedServer())
	{
#if WITH_UNREAL_DEVELOPER_TOOLS
		FModuleManager::Get().LoadModule("MessageLog");
#endif	// WITH_UNREAL_DEVELOPER_TOOLS
#if WITH_EDITOR
		FModuleManager::Get().LoadModule("CollisionAnalyzer");
#endif	// WITH_EDITOR
	}

#if WITH_UNREAL_DEVELOPER_TOOLS
		FModuleManager::Get().LoadModule("FunctionalTesting");
#endif	//WITH_UNREAL_DEVELOPER_TOOLS

	SlowTask.EnterProgressFrame(30);
#if (WITH_EDITOR && !(UE_BUILD_SHIPPING || UE_BUILD_TEST))
	// HACK: load BT editor as early as possible for statically initialized assets (non cooked BT assets needs it)
	// cooking needs this module too
	FModuleManager::Get().LoadModule(TEXT("BehaviorTreeEditor"));

	// Ability tasks are based on GameplayTasks, so we need to make sure that module is loaded as well
	FModuleManager::Get().LoadModule(TEXT("GameplayTasksEditor"));

	IAudioEditorModule* AudioEditorModule = &FModuleManager::LoadModuleChecked<IAudioEditorModule>("AudioEditor");
	AudioEditorModule->RegisterAssetActions();

	// Load the StringTableEditor module to register its asset actions
	FModuleManager::Get().LoadModule("StringTableEditor");

	if( !IsRunningDedicatedServer() )
	{
		// VREditor needs to be loaded in non-server editor builds early, so engine content Blueprints can be loaded during DDC generation
		FModuleManager::Get().LoadModule(TEXT("VREditor"));
	}

	if (IsRunningCommandlet())
	{
		FModuleManager::Get().LoadModule(TEXT("Blutility"));
	}

#endif //(WITH_EDITOR && !(UE_BUILD_SHIPPING || UE_BUILD_TEST))

#if WITH_ENGINE
	// Load runtime client modules (which are also needed at cook-time)
	if( !IsRunningDedicatedServer() )
	{
		FModuleManager::Get().LoadModule(TEXT("Overlay"));
	}

	FModuleManager::Get().LoadModule(TEXT("MediaAssets"));
#endif

	FModuleManager::Get().LoadModule(TEXT("ClothingSystemRuntimeNv"));
#if WITH_EDITOR
	FModuleManager::Get().LoadModule(TEXT("ClothingSystemEditor"));
	FModuleManager::Get().LoadModule(TEXT("AnimationDataController"));
#endif

	FModuleManager::Get().LoadModule(TEXT("PacketHandler"));
	FModuleManager::Get().LoadModule(TEXT("NetworkReplayStreaming"));

	return bSuccess;
}


bool FEngineLoop::LoadStartupModules()
{
	FScopedSlowTask SlowTask(3);

	SlowTask.EnterProgressFrame(1);
	// Load any modules that want to be loaded before default modules are loaded up.
	if (!IProjectManager::Get().LoadModulesForProject(ELoadingPhase::PreDefault) || !IPluginManager::Get().LoadModulesForEnabledPlugins(ELoadingPhase::PreDefault))
	{
		return false;
	}

	SlowTask.EnterProgressFrame(1);
	// Load modules that are configured to load in the default phase
	if (!IProjectManager::Get().LoadModulesForProject(ELoadingPhase::Default) || !IPluginManager::Get().LoadModulesForEnabledPlugins(ELoadingPhase::Default))
	{
		return false;
	}

	SlowTask.EnterProgressFrame(1);
	// Load any modules that want to be loaded after default modules are loaded up.
	if (!IProjectManager::Get().LoadModulesForProject(ELoadingPhase::PostDefault) || !IPluginManager::Get().LoadModulesForEnabledPlugins(ELoadingPhase::PostDefault))
	{
		return false;
	}

	return true;
}


void FEngineLoop::InitTime()
{
	// Init variables used for benchmarking and ticking.
	FApp::SetCurrentTime(FPlatformTime::Seconds());
	MaxFrameCounter				= 0;
	MaxTickTime					= 0;
	TotalTickTime				= 0;
	LastFrameCycles				= FPlatformTime::Cycles();

	float FloatMaxTickTime		= 0;
#if (!UE_BUILD_SHIPPING || ENABLE_PGO_PROFILE)
	FParse::Value(FCommandLine::Get(),TEXT("SECONDS="),FloatMaxTickTime);
	MaxTickTime					= FloatMaxTickTime;

	// look of a version of seconds that only is applied if FApp::IsBenchmarking() is set. This makes it easier on
	// say, iOS, where we have a toggle setting to enable benchmarking, but don't want to have to make user
	// also disable the seconds setting as well. -seconds= will exit the app after time even if benchmarking
	// is not enabled
	// NOTE: This will override -seconds= if it's specified
	if (FApp::IsBenchmarking())
	{
		if (FParse::Value(FCommandLine::Get(),TEXT("BENCHMARKSECONDS="),FloatMaxTickTime) && FloatMaxTickTime)
		{
			MaxTickTime			= FloatMaxTickTime;
		}
	}

	// Use -FPS=X to override fixed tick rate if e.g. -BENCHMARK is used.
	float FixedFPS = 0;
	FParse::Value(FCommandLine::Get(),TEXT("FPS="),FixedFPS);
	if( FixedFPS > 0 )
	{
		FApp::SetFixedDeltaTime(1 / FixedFPS);
	}

#endif // !UE_BUILD_SHIPPING

	// convert FloatMaxTickTime into number of frames (using 1 / FApp::GetFixedDeltaTime() to convert fps to seconds )
	MaxFrameCounter = FMath::TruncToInt(MaxTickTime / FApp::GetFixedDeltaTime());
}


//called via FCoreDelegates::StarvedGameLoop
void GameLoopIsStarved()
{
	FlushPendingDeleteRHIResources_GameThread();
	FStats::AdvanceFrame( true, FStats::FOnAdvanceRenderingThreadStats::CreateStatic( &AdvanceRenderingThreadStatsGT ) );
}


int32 FEngineLoop::Init()
{
	ON_SCOPE_EXIT{ GEngineInitEndTime = FPlatformTime::Seconds(); };
	LLM_SCOPE(ELLMTag::EngineInitMemory);
	SCOPED_BOOT_TIMING("FEngineLoop::Init");

	DECLARE_SCOPE_CYCLE_COUNTER( TEXT( "FEngineLoop::Init" ), STAT_FEngineLoop_Init, STATGROUP_LoadTime );

	FScopedSlowTask SlowTask(100);
	SlowTask.EnterProgressFrame(10);

	FEmbeddedCommunication::ForceTick(10);

	// Figure out which UEngine variant to use.
	UClass* EngineClass = nullptr;
	if( !GIsEditor )
	{
		SCOPED_BOOT_TIMING("Create GEngine");
		// We're the game.
		FString GameEngineClassName;
		GConfig->GetString(TEXT("/Script/Engine.Engine"), TEXT("GameEngine"), GameEngineClassName, GEngineIni);
		EngineClass = StaticLoadClass( UGameEngine::StaticClass(), nullptr, *GameEngineClassName);
		if (EngineClass == nullptr)
		{
			UE_LOG(LogInit, Fatal, TEXT("Failed to load UnrealEd Engine class '%s'."), *GameEngineClassName);
		}
		GEngine = NewObject<UEngine>(GetTransientPackage(), EngineClass);
	}
	else
	{
#if WITH_EDITOR
		// We're UnrealEd.
		FString UnrealEdEngineClassName;
		GConfig->GetString(TEXT("/Script/Engine.Engine"), TEXT("UnrealEdEngine"), UnrealEdEngineClassName, GEngineIni);
		EngineClass = StaticLoadClass(UUnrealEdEngine::StaticClass(), nullptr, *UnrealEdEngineClassName);
		if (EngineClass == nullptr)
		{
			UE_LOG(LogInit, Fatal, TEXT("Failed to load UnrealEd Engine class '%s'."), *UnrealEdEngineClassName);
		}
		GEngine = GEditor = GUnrealEd = NewObject<UUnrealEdEngine>(GetTransientPackage(), EngineClass);
#else
		check(0);
#endif
	}

	FEmbeddedCommunication::ForceTick(11);

	check( GEngine );

	GetMoviePlayer()->PassLoadingScreenWindowBackToGame();
    
    if (FPreLoadScreenManager::Get())
    {
        FPreLoadScreenManager::Get()->PassPreLoadScreenWindowBackToGame();
    }

	{
		SCOPED_BOOT_TIMING("GEngine->ParseCommandline()");
		GEngine->ParseCommandline();
	}

	FEmbeddedCommunication::ForceTick(12);

	{
		SCOPED_BOOT_TIMING("InitTime");
		InitTime();
	}

	SlowTask.EnterProgressFrame(60);

	{
		SCOPED_BOOT_TIMING("GEngine->Init");
		GEngine->Init(this);
	}

	// Call init callbacks
	{
		SCOPED_BOOT_TIMING("OnPostEngineInit.Broadcast");
		FCoreDelegates::OnPostEngineInit.Broadcast();
	}

	SlowTask.EnterProgressFrame(30);

	// initialize engine instance discovery
	if (FPlatformProcess::SupportsMultithreading())
	{
		SCOPED_BOOT_TIMING("SessionService etc");
		if (!IsRunningCommandlet())
		{
			SessionService = FModuleManager::LoadModuleChecked<ISessionServicesModule>("SessionServices").GetSessionService();
			
			if (SessionService.IsValid())
			{
			SessionService->Start();
		}
		}

		EngineService = new FEngineService();
	}

	{
		SCOPED_BOOT_TIMING("IProjectManager::Get().LoadModulesForProject(ELoadingPhase::PostEngineInit)");
		// Load all the post-engine init modules
		if (!IProjectManager::Get().LoadModulesForProject(ELoadingPhase::PostEngineInit) || !IPluginManager::Get().LoadModulesForEnabledPlugins(ELoadingPhase::PostEngineInit))
		{
			RequestEngineExit(TEXT("One or more modules failed PostEngineInit"));
			return 1;
		}
	}

	// Call module loading phases completion callbacks
	{
		SCOPED_BOOT_TIMING("OnAllModuleLoadingPhasesComplete.Broadcast");
		FCoreDelegates::OnAllModuleLoadingPhasesComplete.Broadcast();
	}

	{
		SCOPED_BOOT_TIMING("GEngine->Start()");
		GEngine->Start();
	}

	FEmbeddedCommunication::ForceTick(13);

    if (FPreLoadScreenManager::Get() && FPreLoadScreenManager::Get()->HasActivePreLoadScreenType(EPreLoadScreenTypes::EngineLoadingScreen))
    {
		SCOPED_BOOT_TIMING("WaitForEngineLoadingScreenToFinish");
		FPreLoadScreenManager::Get()->SetEngineLoadingComplete(true);
        FPreLoadScreenManager::Get()->WaitForEngineLoadingScreenToFinish();
    }
    else
    {
		SCOPED_BOOT_TIMING("WaitForMovieToFinish");
		GetMoviePlayer()->WaitForMovieToFinish();
    }

	FTraceAuxiliary::EnableChannels();

#if !UE_SERVER
	// initialize media framework
	IMediaModule* MediaModule = FModuleManager::LoadModulePtr<IMediaModule>("Media");

	if (MediaModule != nullptr)
	{
		MediaModule->SetTimeSource(MakeShareable(new FAppMediaTimeSource));
	}
#endif

	FEmbeddedCommunication::ForceTick(14);

	// initialize automation worker
#if WITH_AUTOMATION_WORKER
	FModuleManager::Get().LoadModule("AutomationWorker");
#endif

	// Automation tests can be invoked locally in non-editor builds configuration (e.g. performance profiling in Test configuration)
#if WITH_ENGINE && !UE_BUILD_SHIPPING
	FModuleManager::Get().LoadModule("AutomationController");
	FModuleManager::GetModuleChecked<IAutomationControllerModule>("AutomationController").Init();
#endif

#if WITH_EDITOR
	if (GIsEditor)
	{
		FModuleManager::Get().LoadModule(TEXT("ProfilerClient"));
	}

	FModuleManager::Get().LoadModule(TEXT("SequenceRecorder"));
	FModuleManager::Get().LoadModule(TEXT("SequenceRecorderSections"));
#endif

	GIsRunning = true;

	if (!GIsEditor)
	{
		// hide a couple frames worth of rendering
		FViewport::SetGameRenderingEnabled(true, 3);
	}

	FEmbeddedCommunication::ForceTick(15);

	FCoreDelegates::StarvedGameLoop.BindStatic(&GameLoopIsStarved);

	// Ready to measure thread heartbeat
	FThreadHeartBeat::Get().Start();

	FShaderPipelineCache::PauseBatching();
   	{
#if defined(WITH_CODE_GUARD_HANDLER) && WITH_CODE_GUARD_HANDLER
         void CheckImageIntegrity();
        CheckImageIntegrity();
#endif
    }
    
    {
		SCOPED_BOOT_TIMING("FCoreDelegates::OnFEngineLoopInitComplete.Broadcast()");
		FCoreDelegates::OnFEngineLoopInitComplete.Broadcast();
	}
	FShaderPipelineCache::ResumeBatching();

#if BUILD_EMBEDDED_APP
	FEmbeddedCommunication::AllowSleep(TEXT("Startup"));
	FEmbeddedCommunication::KeepAwake(TEXT("FirstTicks"), true);
#endif
	
#if UE_EXTERNAL_PROFILING_ENABLED
	FExternalProfiler* ActiveProfiler = FActiveExternalProfilerBase::InitActiveProfiler();
	if (ActiveProfiler)
	{
		ActiveProfiler->Register();
	}
#endif		// UE_EXTERNAL_PROFILING_ENABLED

	FDelayedAutoRegisterHelper::RunAndClearDelayedAutoRegisterDelegates(EDelayedRegisterRunPhase::EndOfEngineInit);

	// Emit logging. Don't edit! Automation looks for this to detect failures during initialization.
	UE_LOG(LogInit, Display, TEXT("Engine is initialized. Leaving FEngineLoop::Init()"));
	return 0;
}


void FEngineLoop::Exit()
{
	STAT_ADD_CUSTOMMESSAGE_NAME( STAT_NamedMarker, TEXT( "EngineLoop.Exit" ) );
	TRACE_CPUPROFILER_EVENT_SCOPE(FEngineLoop::Exit);
	TRACE_BOOKMARK(TEXT("EngineLoop.Exit"));

	GIsRunning	= 0;
	GLogConsole	= nullptr;

	IInstallBundleManager::InstallBundleCompleteDelegate.RemoveAll(this);

	if (FPreLoadScreenManager::Get())
	{
		// If we exit before the preload screen is done, clean it up before shutting down
		if (FPreLoadScreenManager::Get()->HasActivePreLoadScreenType(EPreLoadScreenTypes::EngineLoadingScreen))
		{
			FPreLoadScreenManager::Get()->SetEngineLoadingComplete(true);
			FPreLoadScreenManager::Get()->WaitForEngineLoadingScreenToFinish();
		}

		FPreLoadScreenManager::Destroy();
	}

	// shutdown visual logger and flush all data
#if ENABLE_VISUAL_LOG
	FVisualLogger::Get().Shutdown();
#endif

	FAssetCompilingManager::Get().Shutdown();

#if WITH_ENGINE
	// shut down messaging
	delete EngineService;
	EngineService = nullptr;

	if (SessionService.IsValid())
	{
		SessionService->Stop();
		SessionService.Reset();
	}

	if (GDistanceFieldAsyncQueue)
	{
		delete GDistanceFieldAsyncQueue;
		GDistanceFieldAsyncQueue = nullptr;
	}

	if (GCardRepresentationAsyncQueue)
	{
		delete GCardRepresentationAsyncQueue;
		GCardRepresentationAsyncQueue = nullptr;
	}
#endif // WITH_ENGINE

	if ( GEngine != nullptr )
	{
		GEngine->PreExit();
	}

	if (GEngine != nullptr)
	{
		GEngine->ReleaseAudioDeviceManager();
	}


	// Make sure we're not in the middle of loading something.
	{
		// From now on it's not allowed to request new async loads
		SetAsyncLoadingAllowed(false);

		bool bFlushOnExit = true;
		if (GConfig)
		{
			FBoolConfigValueHelper FlushStreamingOnExitHelper(TEXT("/Script/Engine.StreamingSettings"), TEXT("s.FlushStreamingOnExit"), GEngineIni);
			bFlushOnExit = FlushStreamingOnExitHelper;
		}
		if (bFlushOnExit)
		{
			FlushAsyncLoading();
		}
		else
		{
			CancelAsyncLoading();
		}
	}

	// Block till all outstanding resource streaming requests are fulfilled.
	if (!IStreamingManager::HasShutdown())
	{
		UTexture2D::CancelPendingTextureStreaming();
		if (FStreamingManagerCollection* StreamingManager = IStreamingManager::Get_Concurrent())
		{
			StreamingManager->BlockTillAllRequestsFinished();
		}
	}
	FAudioDeviceManager::Shutdown();

	// close all windows
	FSlateApplication::Shutdown();

#if !UE_SERVER
	if ( FEngineFontServices::IsInitialized() )
	{
		FEngineFontServices::Destroy();
	}
#endif



#if WITH_EDITOR
	// These module must be shut down first because other modules may try to access them during shutdown.
	// Accessing these modules at shutdown causes instability since the object system will have been shut down and these modules uses uobjects internally.
	FModuleManager::Get().UnloadModule("AssetTools", true);

#endif // WITH_EDITOR
	FModuleManager::Get().UnloadModule("WorldBrowser", true);

#if !PLATFORM_ANDROID 	// AppPreExit doesn't work on Android
	AppPreExit();

	TermGamePhys();
#endif

#if WITH_COREUOBJECT
	// PackageResourceManager depends on AssetRegistry, so must be shutdown before we unload the AssetRegistry module
	IPackageResourceManager::Shutdown();
#endif
	FModuleManager::Get().UnloadModule("AssetRegistry", true);

#if PLATFORM_ANDROID
	// AppPreExit() stops malloc profiler, do it here instead
	MALLOC_PROFILER( GMalloc->Exec(nullptr, TEXT("MPROF STOP"), *GLog);	);
#endif // !ANDROID

#if WITH_EDITOR
	IBulkDataRegistry::Shutdown();
#endif

	// Stop the rendering thread.
	StopRenderingThread();
	
	// Disable the PSO cache
	FShaderPipelineCache::Shutdown();

	// Close shader code map, if any
	FShaderCodeLibrary::Shutdown();

	// Stop IoDispatcher after FShaderCodeLibrary, as it holds on to file requests
#if WITH_ENGINE
	UE::DerivedData::IoStore::TearDownIoDispatcher();
#endif
#if USE_IO_DISPATCHER
	FIoDispatcher::Shutdown();
#endif

#if WITH_EDITOR
	// Make sure we shut this down before the modules are torn down, we can clean this up if/when the
	// virtualization module is moved to be a plugin
	UE::Virtualization::Shutdown();
#endif //WITH_EDITOR

#if !PLATFORM_ANDROID // UnloadModules doesn't work on Android
#if WITH_ENGINE
	// Save the hot reload state
	IHotReloadInterface* HotReload = IHotReloadInterface::GetPtr();
	if(HotReload != nullptr)
	{
		HotReload->SaveConfig();
	}
#endif

	// Unload all modules.  Note that this doesn't actually unload the module DLLs (that happens at
	// process exit by the OS), but it does call ShutdownModule() on all loaded modules in the reverse
	// order they were loaded in, so that systems can unregister and perform general clean up.
	{
		SCOPED_BOOT_TIMING("UnloadModulesAtShutdown");
		FModuleManager::Get().UnloadModulesAtShutdown();
	}
#endif // !ANDROID

	IStreamingManager::Shutdown();

	StopRHIThread();

	DestroyMoviePlayer();

	// Move earlier?
#if STATS
	FThreadStats::StopThread();
#endif

	FTaskGraphInterface::Shutdown();

	RHIExit();

	FPlatformMisc::ShutdownTaggedStorage();

#if WITH_ENGINE && FRAMEPRO_ENABLED
	FFrameProProfiler::TearDown();
#endif // FRAMEPRO_ENABLED
}


void FEngineLoop::ProcessLocalPlayerSlateOperations() const
{
	FSlateApplication& SlateApp = FSlateApplication::Get();

	// For all the game worlds drill down to the player controller for each game viewport and process it's slate operation
	for ( const FWorldContext& Context : GEngine->GetWorldContexts() )
	{
		UWorld* CurWorld = Context.World();
		if ( CurWorld && CurWorld->IsGameWorld() )
		{
			UGameViewportClient* GameViewportClient = CurWorld->GetGameViewport();
			TSharedPtr< SViewport > ViewportWidget = GameViewportClient ? GameViewportClient->GetGameViewportWidget() : nullptr;

			if ( ViewportWidget.IsValid() )
			{
				FWidgetPath PathToWidget;
				SlateApp.GeneratePathToWidgetUnchecked(ViewportWidget.ToSharedRef(), PathToWidget);

				if (PathToWidget.IsValid())
				{
					for (FConstPlayerControllerIterator Iterator = CurWorld->GetPlayerControllerIterator(); Iterator; ++Iterator)
					{
						APlayerController* PlayerController = Iterator->Get();
						if (PlayerController)
						{
							if (ULocalPlayer* LocalPlayer = Cast<ULocalPlayer>(PlayerController->Player))
							{
								TOptional<int32> UserIndex = SlateApp.GetUserIndexForController(LocalPlayer->GetControllerId());
								if (UserIndex.IsSet())
								{
									FReply& TheReply = LocalPlayer->GetSlateOperations();
									SlateApp.ProcessExternalReply(PathToWidget, TheReply, UserIndex.GetValue());

									TheReply = FReply::Unhandled();
								}
							}
						}
					}
				}
			}
		}
	}
}

#if WITH_ENGINE
void OnStartupContentMounted(FInstallBundleRequestResultInfo Result, bool bDumpEarlyConfigReads, bool bDumpEarlyPakFileReads, bool bReloadConfig, bool bForceQuitAfterEarlyReads)
{
	if (Result.bIsStartup && Result.Result == EInstallBundleResult::OK)
	{
		DumpEarlyReads(bDumpEarlyConfigReads, bDumpEarlyPakFileReads, bForceQuitAfterEarlyReads);
		HandleConfigReload(bReloadConfig);

		IInstallBundleManager::InstallBundleCompleteDelegate.RemoveAll(&GEngineLoop);
	}
}
#endif

void DumpEarlyReads(bool bDumpEarlyConfigReads, bool bDumpEarlyPakFileReads, bool bForceQuitAfterEarlyReads)
{
	if (bDumpEarlyConfigReads)
	{
		UE::ConfigUtilities::DumpRecordedConfigReadsFromIni();
		UE::ConfigUtilities::DeleteRecordedConfigReadsFromIni();
	}

	if (bDumpEarlyPakFileReads)
	{
		DumpRecordedFileReadsFromPaks();
		DeleteRecordedFileReadsFromPaks();
	}

	if (bForceQuitAfterEarlyReads)
	{
		GLog->Flush();
		if (GEngine)
		{
			GEngine->DeferredCommands.Emplace(TEXT("Quit force"));
		}
		else
		{
			FPlatformMisc::RequestExit(true);
		}
	}
}

void HandleConfigReload(bool bReloadConfig)
{
	if (bReloadConfig)
	{
		UE::ConfigUtilities::ReapplyRecordedCVarSettingsFromIni();
		UE::ConfigUtilities::DeleteRecordedCVarSettingsFromIni();
	}
}

bool FEngineLoop::ShouldUseIdleMode() const
{
	static const auto CVarIdleWhenNotForeground = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("t.IdleWhenNotForeground"));
	bool bIdleMode = false;

	// Yield cpu usage if desired
	if (FApp::IsGame()
		&& FPlatformProperties::SupportsWindowedMode()
		&& CVarIdleWhenNotForeground->GetValueOnGameThread()
		&& !FApp::HasFocus())
	{
		bIdleMode = true;
	}
	
#if BUILD_EMBEDDED_APP
	if (FEmbeddedCommunication::IsAwakeForTicking() == false)
	{
		bIdleMode = true;
	}
#endif

	if (bIdleMode)
	{
		for (const FWorldContext& Context : GEngine->GetWorldContexts())
		{
			if (!Context.World()->AreAlwaysLoadedLevelsLoaded())
			{
				bIdleMode = false;
				break;
			}
		}
	}

	return bIdleMode;
}

#if !UE_BUILD_SHIPPING && !UE_BUILD_TEST && MALLOC_GT_HOOKS

#include "Containers/StackTracker.h"
static TAutoConsoleVariable<int32> CVarLogGameThreadMallocChurn(
	TEXT("LogGameThreadMallocChurn.Enable"),
	0,
	TEXT("If > 0, then collect sample game thread malloc, realloc and free, periodically print a report of the worst offenders."));

static TAutoConsoleVariable<int32> CVarLogGameThreadMallocChurn_PrintFrequency(
	TEXT("LogGameThreadMallocChurn.PrintFrequency"),
	300,
	TEXT("Number of frames between churn reports."));

static TAutoConsoleVariable<int32> CVarLogGameThreadMallocChurn_Threshhold(
	TEXT("LogGameThreadMallocChurn.Threshhold"),
	10,
	TEXT("Minimum average number of allocs per frame to include in the report."));

static TAutoConsoleVariable<int32> CVarLogGameThreadMallocChurn_SampleFrequency(
	TEXT("LogGameThreadMallocChurn.SampleFrequency"),
	100,
	TEXT("Number of allocs to skip between samples. This is used to prevent churn sampling from slowing the game down too much."));

static TAutoConsoleVariable<int32> CVarLogGameThreadMallocChurn_StackIgnore(
	TEXT("LogGameThreadMallocChurn.StackIgnore"),
	2,
	TEXT("Number of items to discard from the top of a stack frame."));

static TAutoConsoleVariable<int32> CVarLogGameThreadMallocChurn_RemoveAliases(
	TEXT("LogGameThreadMallocChurn.RemoveAliases"),
	1,
	TEXT("If > 0 then remove aliases from the counting process. This essentialy merges addresses that have the same human readable string. It is slower."));

static TAutoConsoleVariable<int32> CVarLogGameThreadMallocChurn_StackLen(
	TEXT("LogGameThreadMallocChurn.StackLen"),
	3,
	TEXT("Maximum number of stack frame items to keep. This improves aggregation because calls that originate from multiple places but end up in the same place will be accounted together."));


extern CORE_API TFunction<void(int32)>* GGameThreadMallocHook;

struct FScopedSampleMallocChurn
{
	static FStackTracker GGameThreadMallocChurnTracker;
	static uint64 DumpFrame;

	bool bEnabled;
	int32 CountDown;
	TFunction<void(int32)> Hook;

	FScopedSampleMallocChurn()
		: bEnabled(CVarLogGameThreadMallocChurn.GetValueOnGameThread() > 0)
		, CountDown(CVarLogGameThreadMallocChurn_SampleFrequency.GetValueOnGameThread())
		, Hook(
		[this](int32 Index)
	{
		if (--CountDown <= 0)
		{
			CountDown = CVarLogGameThreadMallocChurn_SampleFrequency.GetValueOnGameThread();
			CollectSample();
		}
	}
	)
	{
		if (bEnabled)
		{
			check(IsInGameThread());
			check(!GGameThreadMallocHook);
			if (!DumpFrame)
			{
				DumpFrame = GFrameCounter + CVarLogGameThreadMallocChurn_PrintFrequency.GetValueOnGameThread();
				GGameThreadMallocChurnTracker.ResetTracking();
			}
			GGameThreadMallocChurnTracker.ToggleTracking(true, true);
			GGameThreadMallocHook = &Hook;
		}
		else
		{
			check(IsInGameThread());
			GGameThreadMallocChurnTracker.ToggleTracking(false, true);
			if (DumpFrame)
			{
				DumpFrame = 0;
				GGameThreadMallocChurnTracker.ResetTracking();
			}
		}
	}
	~FScopedSampleMallocChurn()
	{
		if (bEnabled)
		{
			check(IsInGameThread());
			check(GGameThreadMallocHook == &Hook);
			GGameThreadMallocHook = nullptr;
			GGameThreadMallocChurnTracker.ToggleTracking(false, true);
			check(DumpFrame);
			if (GFrameCounter > DumpFrame)
			{
				PrintResultsAndReset();
			}
		}
	}

	void CollectSample()
	{
		check(IsInGameThread());
		GGameThreadMallocChurnTracker.CaptureStackTrace(CVarLogGameThreadMallocChurn_StackIgnore.GetValueOnGameThread(), nullptr, CVarLogGameThreadMallocChurn_StackLen.GetValueOnGameThread(), CVarLogGameThreadMallocChurn_RemoveAliases.GetValueOnGameThread() > 0);
	}
	void PrintResultsAndReset()
	{
		DumpFrame = GFrameCounter + CVarLogGameThreadMallocChurn_PrintFrequency.GetValueOnGameThread();
		FOutputDeviceRedirector* Log = FOutputDeviceRedirector::Get();
		float SampleAndFrameCorrection = float(CVarLogGameThreadMallocChurn_SampleFrequency.GetValueOnGameThread()) / float(CVarLogGameThreadMallocChurn_PrintFrequency.GetValueOnGameThread());
		GGameThreadMallocChurnTracker.DumpStackTraces(CVarLogGameThreadMallocChurn_Threshhold.GetValueOnGameThread(), *Log, SampleAndFrameCorrection);
		GGameThreadMallocChurnTracker.ResetTracking();
	}
};
FStackTracker FScopedSampleMallocChurn::GGameThreadMallocChurnTracker;
uint64 FScopedSampleMallocChurn::DumpFrame = 0;

#endif

static uint32 TraceFrameEventThreadId = (uint32) -1;

static inline void BeginFrameRenderThread(FRHICommandListImmediate& RHICmdList, uint64 CurrentFrameCounter)
{
	if ( !FApp::CanEverRender() )
	{
		GFrameNumberRenderThread++;
		RHICmdList.BeginFrame();
		return;
	}

	TRACE_BEGIN_FRAME(TraceFrameType_Rendering);
	GRHICommandList.LatchBypass();
	GFrameNumberRenderThread++;

#if !UE_BUILD_SHIPPING 
	// If we are profiling, kick off a long GPU task to make the GPU always behind the CPU so that we
	// won't get GPU idle time measured in profiling results
#if WITH_PROFILEGPU 
	if (GTriggerGPUProfile && !GTriggerGPUHitchProfile)
	{
		IssueScalableLongGPUTask(RHICmdList);
	}
#endif

#if CPUPROFILERTRACE_ENABLED
	TraceFrameEventThreadId = (uint32) -1;
	if (UE_TRACE_CHANNELEXPR_IS_ENABLED(CpuChannel))
	{
		TraceFrameEventThreadId = FPlatformTLS::GetCurrentThreadId();
		FCpuProfilerTrace::OutputBeginDynamicEvent(TEXT("Frame"), __FILE__, __LINE__);
	}
#endif //CPUPROFILERTRACE_ENABLED

	FString FrameString = FString::Printf(TEXT("Frame %d"), CurrentFrameCounter);
#if ENABLE_NAMED_EVENTS
#if PLATFORM_LIMIT_PROFILER_UNIQUE_NAMED_EVENTS
	FPlatformMisc::BeginNamedEvent(FColor::Yellow, TEXT("Frame"));
#else
	FPlatformMisc::BeginNamedEvent(FColor::Yellow, *FrameString);
#endif
#endif // ENABLE_NAMED_EVENTS

	RHICmdList.PushEvent(*FrameString, FColor::Green);
#endif // !UE_BUILD_SHIPPING

	GPU_STATS_BEGINFRAME(RHICmdList);
	RHICmdList.BeginFrame();
	FCoreDelegates::OnBeginFrameRT.Broadcast();

	RHICmdList.EnqueueLambda([CurrentFrameCounter](FRHICommandListImmediate& InRHICmdList)
	{
		GEngine->SetRenderSubmitLatencyMarkerStart(CurrentFrameCounter);
	});

#if CSV_PROFILER
	FCsvProfiler::BeginExclusiveStat("RenderThreadOther");
#endif
}


static inline void EndFrameRenderThread(FRHICommandListImmediate& RHICmdList, uint64 CurrentFrameCounter)
{
	if ( !FApp::CanEverRender() )
	{
		RHICmdList.EndFrame();
		return;
	}

#if CSV_PROFILER
	FCsvProfiler::EndExclusiveStat("RenderThreadOther");
#endif

	RHICmdList.EnqueueLambda([CurrentFrameCounter](FRHICommandListImmediate& InRHICmdList)
	{
		GEngine->SetRenderSubmitLatencyMarkerEnd(CurrentFrameCounter);
	});

	FCoreDelegates::OnEndFrameRT.Broadcast();
	RHICmdList.EndFrame();

	GPU_STATS_ENDFRAME(RHICmdList);
#if !UE_BUILD_SHIPPING 
	RHICmdList.PopEvent();
#if ENABLE_NAMED_EVENTS
	FPlatformMisc::EndNamedEvent();
#endif
#if CPUPROFILERTRACE_ENABLED
	if (TraceFrameEventThreadId == FPlatformTLS::GetCurrentThreadId())
	{
		FCpuProfilerTrace::OutputEndEvent();
	}
#endif // CPUPROFILERTRACE_ENABLED
#endif // !UE_BUILD_SHIPPING 
	TRACE_END_FRAME(TraceFrameType_Rendering);
}

#if BUILD_EMBEDDED_APP
#include "Misc/EmbeddedCommunication.h"
#endif

void FEngineLoop::Tick()
{
	TRACE_CPUPROFILER_EVENT_SCOPE(FEngineLoop::Tick);
	SCOPE_STALL_COUNTER(FEngineLoop::Tick, 2.0);

#if !UE_BUILD_SHIPPING && !UE_BUILD_TEST && MALLOC_GT_HOOKS
	FScopedSampleMallocChurn ChurnTracker;
#endif
	// let the low level mem tracker pump once a frame to update states
	LLM(FLowLevelMemTracker::Get().UpdateStatsPerFrame());

	LLM_SCOPE(ELLMTag::EngineMisc);

	BeginExitIfRequested();
#if !UE_BUILD_SHIPPING
	if (GScopedTestExit.IsValid() && GScopedTestExit->RequestExit())
	{
		UE_LOG(LogExit, Display, TEXT("**** TestExit: %s ****"), *GScopedTestExit->RequestExitPhrase());
		FPlatformMisc::RequestExit(true);
	}
#endif

	{
		TRACE_CPUPROFILER_EVENT_SCOPE(HeartBeat);
		// Send a heartbeat for the diagnostics thread
		FThreadHeartBeat::Get().HeartBeat(true);
	}

	FGameThreadHitchHeartBeat::Get().FrameStart();

	{
		TRACE_CPUPROFILER_EVENT_SCOPE(TickHotfixables);
		FPlatformMisc::TickHotfixables();
	}

	// Make sure something is ticking the rendering tickables in -onethread mode to avoid leaks/bugs.
	if (!GUseThreadedRendering && !GIsRenderingThreadSuspended.Load(EMemoryOrder::Relaxed))
	{
		TRACE_CPUPROFILER_EVENT_SCOPE(TickRenderingTickables);
		TickRenderingTickables();
	}

	// Ensure we aren't starting a frame while loading or playing a loading movie
	FMoviePlayerProxy::BlockingForceFinished();
	ensure(GetMoviePlayer()->IsLoadingFinished() && !GetMoviePlayer()->IsMovieCurrentlyPlaying());

#if UE_EXTERNAL_PROFILING_ENABLED
	FExternalProfiler* ActiveProfiler = FActiveExternalProfilerBase::GetActiveProfiler();
	if (ActiveProfiler)
	{
		ActiveProfiler->FrameSync();
	}
#endif		// UE_EXTERNAL_PROFILING_ENABLED

	FPlatformMisc::BeginNamedEventFrame();

	uint64 CurrentFrameCounter = GFrameCounter;

#if ENABLE_NAMED_EVENTS
	TCHAR IndexedFrameString[32] = { 0 };
	const TCHAR* FrameString = nullptr;
#if CPUPROFILERTRACE_ENABLED
	const bool bTraceCpuChannelEnabled = UE_TRACE_CHANNELEXPR_IS_ENABLED(CpuChannel);
	static FAutoNamedEventsToggler TraceNamedEventsToggler;
	TraceNamedEventsToggler.Update(bTraceCpuChannelEnabled && UE::Trace::IsTracing());
	if (bTraceCpuChannelEnabled)
	{
		FrameString = TEXT("FEngineLoop");
	}
	else
#endif
	{
#if PLATFORM_LIMIT_PROFILER_UNIQUE_NAMED_EVENTS
		FrameString = TEXT("FEngineLoop");
#else
		FCString::Snprintf(IndexedFrameString, 32, TEXT("Frame %d"), CurrentFrameCounter);
		FrameString = IndexedFrameString;
#endif
	}
	SCOPED_NAMED_EVENT_TCHAR(FrameString, FColor::Red);
#endif

	// execute callbacks for cvar changes
	{
		QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_Tick_CallAllConsoleVariableSinks);
		IConsoleManager::Get().CallAllConsoleVariableSinks();
	}

	TRACE_BEGIN_FRAME(TraceFrameType_Game);

	{
		SCOPE_CYCLE_COUNTER(STAT_FrameTime);

		#if WITH_PROFILEGPU && !UE_BUILD_SHIPPING
			// Issue the measurement of the execution time of a basic LongGPUTask unit on the very first frame
			// The results will be retrived on the first call of IssueScalableLongGPUTask
			if (GFrameCounter == 0 && IsFeatureLevelSupported(GMaxRHIShaderPlatform, ERHIFeatureLevel::SM5) && FApp::CanEverRender())
			{
				FlushRenderingCommands();

				ENQUEUE_RENDER_COMMAND(MeasureLongGPUTaskExecutionTimeCmd)(
					[](FRHICommandListImmediate& RHICmdList)
					{
						MeasureLongGPUTaskExecutionTime(RHICmdList);
					});
			}
		#endif

		FCoreDelegates::OnBeginFrame.Broadcast();

		// flush debug output which has been buffered by other threads
		{
			QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_FlushThreadedLogs); 
			GLog->FlushThreadedLogs(EOutputDeviceRedirectorFlushOptions::Async);
		}

		// exit if frame limit is reached in benchmark mode, or if time limit is reached
		if ((FApp::IsBenchmarking() && MaxFrameCounter && (GFrameCounter > MaxFrameCounter)) ||
			(MaxTickTime && (TotalTickTime > MaxTickTime)))
		{
			FPlatformMisc::RequestExit(0);
		}

		// set FApp::CurrentTime, FApp::DeltaTime and potentially wait to enforce max tick rate
		{
			QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_UpdateTimeAndHandleMaxTickRate);
			GEngine->UpdateTimeAndHandleMaxTickRate();
			GEngine->SetSimulationLatencyMarkerStart(CurrentFrameCounter);
		}

		for (const FWorldContext& Context : GEngine->GetWorldContexts())
		{
			UWorld* CurrentWorld = Context.World();
			if (CurrentWorld)
			{
				FSceneInterface* Scene = CurrentWorld->Scene;
				ENQUEUE_RENDER_COMMAND(UpdateScenePrimitives)(
					[Scene](FRHICommandListImmediate& RHICmdList)
				{
					Scene->UpdateAllPrimitiveSceneInfos(RHICmdList);
				});
			}
		}

		// beginning of RHI frame
		ENQUEUE_RENDER_COMMAND(BeginFrame)([CurrentFrameCounter](FRHICommandListImmediate& RHICmdList)
		{
			BeginFrameRenderThread(RHICmdList, CurrentFrameCounter);
		});

		for (const FWorldContext& Context : GEngine->GetWorldContexts())
		{
			UWorld* CurrentWorld = Context.World();
			if (CurrentWorld)
			{
				FSceneInterface* Scene = CurrentWorld->Scene;

				ENQUEUE_RENDER_COMMAND(SceneStartFrame)([Scene](FRHICommandListImmediate& RHICmdList)
				{
					Scene->StartFrame();
				});
			}
		}

#if !UE_SERVER && WITH_ENGINE
		if (!GIsEditor && GEngine->GameViewport && GEngine->GameViewport->GetWorld() && GEngine->GameViewport->GetWorld()->IsCameraMoveable())
		{
			// When not in editor, we emit dynamic resolution's begin frame right after RHI's.
			GEngine->EmitDynamicResolutionEvent(EDynamicResolutionStateEvent::BeginFrame);
		}
#endif

		// tick performance monitoring
		{
			QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_TickFPSChart);
			GEngine->TickPerformanceMonitoring( FApp::GetDeltaTime() );

			extern COREUOBJECT_API void ResetAsyncLoadingStats();
			ResetAsyncLoadingStats();
		}

#if UPDATE_MALLOC_STATS
		// update memory allocator stats
		{
			QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_Malloc_UpdateStats);
			GMalloc->UpdateStats();
		}
#endif
	}

	FStats::AdvanceFrame( false, FStats::FOnAdvanceRenderingThreadStats::CreateStatic( &AdvanceRenderingThreadStatsGT ) );

	{
		SCOPE_CYCLE_COUNTER( STAT_FrameTime );

		// Calculates average FPS/MS (outside STATS on purpose)
		CalculateFPSTimings();

		// Note the start of a new frame
		MALLOC_PROFILER(GMalloc->Exec(nullptr, *FString::Printf(TEXT("SNAPSHOTMEMORYFRAME")),*GLog));

		// handle some per-frame tasks on the rendering thread
		ENQUEUE_RENDER_COMMAND(ResetDeferredUpdates)(
			[](FRHICommandList& RHICmdList)
			{
				FDeferredUpdateResource::ResetNeedsUpdate();
				FlushPendingDeleteRHIResources_RenderThread();
			});

		// Don't pump messages if we're running embedded as the outer application
		// will pass us messages instead.
		if (!GUELibraryOverrideSettings.bIsEmbedded)
		{
			GEngine->SetInputSampleLatencyMarker(CurrentFrameCounter);

			//QUICK_SCOPE_CYCLE_COUNTER(STAT_PumpMessages);
			FPlatformApplicationMisc::PumpMessages(true);
		}

		bool bIdleMode;
		{

			QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_Idle);

			// Idle mode prevents ticking and rendering completely
			bIdleMode = ShouldUseIdleMode();
			if (bIdleMode)
			{
				// Yield CPU time
				FPlatformProcess::Sleep(.1f);
			}
		}

		// @todo vreditor urgent: Temporary hack to allow world-to-meters to be set before
		// input is polled for motion controller devices each frame.
		extern ENGINE_API float GNewWorldToMetersScale;
		if( GNewWorldToMetersScale != 0.0f  )
		{
#if WITH_ENGINE
			UWorld* WorldToScale = GWorld;

#if WITH_EDITOR
			if( GIsEditor && GEditor->PlayWorld != nullptr && GEditor->bIsSimulatingInEditor )
			{
				WorldToScale = GEditor->PlayWorld;
			}
#endif //WITH_EDITOR

			if( WorldToScale != nullptr )
			{
				if( GNewWorldToMetersScale != WorldToScale->GetWorldSettings()->WorldToMeters )
				{
					WorldToScale->GetWorldSettings()->WorldToMeters = GNewWorldToMetersScale;
				}
			}

			GNewWorldToMetersScale = 0.0f;
		}
#endif //WITH_ENGINE

		// tick active platform files
		FPlatformFileManager::Get().TickActivePlatformFile();

		// Roughly track the time when the input was sampled
		FCoreDelegates::OnSamplingInput.Broadcast();

		// process accumulated Slate input
		if (FSlateApplication::IsInitialized() && !bIdleMode)
		{
			CSV_SCOPED_TIMING_STAT_EXCLUSIVE(Input);
			SCOPE_TIME_GUARD(TEXT("SlateInput"));
			QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_Tick_SlateInput);
			LLM_SCOPE(ELLMTag::UI);

			FSlateApplication& SlateApp = FSlateApplication::Get();
            {
                QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_Tick_PollGameDeviceState);
                SlateApp.PollGameDeviceState();
            }
			// Gives widgets a chance to process any accumulated input
            {
                QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_Tick_FinishedInputThisFrame);
                SlateApp.FinishedInputThisFrame();
            }
		}
		
		// init for RDG resource dump
		#if WITH_ENGINE && WITH_DUMPGPU
			FRDGBuilder::InitResourceDump();
		#endif

		// main game engine tick (world, game objects, etc.)
		GEngine->Tick(FApp::GetDeltaTime(), bIdleMode);

		// If a movie that is blocking the game thread has been playing,
		// wait for it to finish before we continue to tick or tick again
		// We do this right after GEngine->Tick() because that is where user code would initiate a load / movie.
		{
            if (FPreLoadScreenManager::Get())
            {
                if (FPreLoadScreenManager::Get()->HasRegisteredPreLoadScreenType(EPreLoadScreenTypes::EngineLoadingScreen))
                {
                    //Wait for any Engine Loading Screen to stop
                    if (FPreLoadScreenManager::Get()->HasActivePreLoadScreenType(EPreLoadScreenTypes::EngineLoadingScreen))
                    {
                        FPreLoadScreenManager::Get()->WaitForEngineLoadingScreenToFinish();
                    }

                    //Switch Game Window Back
                    UGameEngine* GameEngine = Cast<UGameEngine>(GEngine);
                    if (GameEngine)
                    {
                        GameEngine->SwitchGameWindowToUseGameViewport();
                    }
                }

#if !UE_SERVER
				// Is it ok to start up the movie player?
				if (!IsRunningDedicatedServer() && !IsRunningCommandlet() && !GetMoviePlayer()->IsMovieCurrentlyPlaying())
				{
					// Enable the MoviePlayer now that the preload screen manager is done.
					if (FSlateRenderer* Renderer = FSlateApplication::Get().GetRenderer())
					{
						GetMoviePlayer()->Initialize(*Renderer, FPreLoadScreenManager::Get()->GetRenderWindow());
					}
				}
#endif // !UE_SERVER

                //Destroy / Clean Up PreLoadScreenManager as we are now done
                FPreLoadScreenManager::Destroy();
            }
			else
			{
				QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_WaitForMovieToFinish);
				GetMoviePlayer()->WaitForMovieToFinish(true);
			}
		}

		FAssetCompilingManager::Get().ProcessAsyncTasks(true);

		FMoviePlayerProxy::BlockingForceFinished();
		// Tick the platform and input portion of Slate application, we need to do this before we run things
		// concurrent with networking.
		if (FSlateApplication::IsInitialized() && !bIdleMode)
		{
			{
				QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_ProcessPlayerControllersSlateOperations);
				check(!IsRunningDedicatedServer());

				// Process slate operations accumulated in the world ticks.
				ProcessLocalPlayerSlateOperations();
			}

			FSlateApplication::Get().Tick(ESlateTickType::PlatformAndInput);
		}

#if WITH_ENGINE
		// process concurrent Slate tasks
		FGraphEventRef ConcurrentTask;
		FEvent* ConcurrentTaskCompleteEvent = nullptr;
		const bool bDoConcurrentSlateTick = GEngine->ShouldDoAsyncEndOfFrameTasks();

		const UGameViewportClient* const GameViewport = GEngine->GameViewport;
		const UWorld* const GameViewportWorld = GameViewport ? GameViewport->GetWorld() : nullptr;
		UDemoNetDriver* const CurrentDemoNetDriver = GameViewportWorld ? GameViewportWorld->GetDemoNetDriver() : nullptr;

		const bool bValidateReplicatedProperties = CurrentDemoNetDriver && CVarDoAsyncEndOfFrameTasksValidateReplicatedProperties.GetValueOnGameThread() != 0;

		if (bDoConcurrentSlateTick)
		{
			const float DeltaSeconds = FApp::GetDeltaTime();

			if (CurrentDemoNetDriver && CurrentDemoNetDriver->ShouldTickFlushAsyncEndOfFrame())
			{
				ConcurrentTaskCompleteEvent = FPlatformProcess::GetSynchEventFromPool();
				check(ConcurrentTaskCompleteEvent);

				ConcurrentTask = TGraphTask<FExecuteConcurrentWithSlateTickTask>::CreateTask(nullptr, ENamedThreads::GameThread).ConstructAndDispatchWhenReady(
					[CurrentDemoNetDriver, DeltaSeconds]()
				{
					if (CVarDoAsyncEndOfFrameTasksRandomize.GetValueOnAnyThread(true) > 0)
					{
						FPlatformProcess::Sleep(FMath::RandRange(0.0f, .003f)); // this shakes up the threading to find race conditions
					}

					if (CurrentDemoNetDriver != nullptr)
					{
						CurrentDemoNetDriver->TickFlushAsyncEndOfFrame(DeltaSeconds);
					}
				},
				ConcurrentTaskCompleteEvent);
				check(ConcurrentTask.IsValid());

				// If we're validating, we want to only test the slate tick so wait for the task
				if (bValidateReplicatedProperties)
				{
					CSV_SCOPED_SET_WAIT_STAT(ConcurrentWithSlate);

					QUICK_SCOPE_CYCLE_COUNTER(STAT_ConcurrentWithSlateTickTasks_Wait);
					check(ConcurrentTaskCompleteEvent);
					ConcurrentTaskCompleteEvent->Wait();
					FPlatformProcess::ReturnSynchEventToPool(ConcurrentTaskCompleteEvent);
					ConcurrentTaskCompleteEvent = nullptr;
					ConcurrentTask = nullptr;
				}
			}
		}

		// Optionally validate that Slate has not modified any replicated properties for client replay recording.
		FDemoSavedPropertyState PreSlateObjectStates;
		if (bValidateReplicatedProperties)
		{
			PreSlateObjectStates = CurrentDemoNetDriver->SavePropertyState();
		}
#endif

		// Tick(Advance) Time for the application and then tick and paint slate application widgets.
		// We split separate this action from the one above to permit running network replication concurrent with slate widget ticking and painting.
		if (FSlateApplication::IsInitialized() && !bIdleMode)
		{
			FMoviePlayerProxy::SetIsSlateThreadAllowed(false);
			FSlateApplication::Get().Tick(ESlateTickType::TimeAndWidgets);
			FMoviePlayerProxy::SetIsSlateThreadAllowed(true);
		}

#if WITH_ENGINE
		if (bValidateReplicatedProperties)
		{
			const bool bReplicatedPropertiesDifferent = CurrentDemoNetDriver->ComparePropertyState(PreSlateObjectStates);
			if (bReplicatedPropertiesDifferent)
			{
				UE_LOG(LogInit, Log, TEXT("Replicated properties changed during Slate tick!"));
			}
		}

		if (ConcurrentTask.GetReference())
		{
			CSV_SCOPED_SET_WAIT_STAT(ConcurrentWithSlate);

			QUICK_SCOPE_CYCLE_COUNTER(STAT_ConcurrentWithSlateTickTasks_Wait);
			check(ConcurrentTaskCompleteEvent);
			ConcurrentTaskCompleteEvent->Wait();
			FPlatformProcess::ReturnSynchEventToPool(ConcurrentTaskCompleteEvent);
			ConcurrentTaskCompleteEvent = nullptr;
			ConcurrentTask = nullptr;
		}
		{
			ENQUEUE_RENDER_COMMAND(WaitForOutstandingTasksOnly_for_DelaySceneRenderCompletion)(
				[](FRHICommandList& RHICmdList)
				{
					QUICK_SCOPE_CYCLE_COUNTER(STAT_DelaySceneRenderCompletion_TaskWait);
					FRHICommandListExecutor::GetImmediateCommandList().ImmediateFlush(EImmediateFlushType::WaitForOutstandingTasksOnly);
				});
		}
#endif

#if STATS
		// Clear any stat group notifications we have pending just in case they weren't claimed during FSlateApplication::Get().Tick
		extern CORE_API void ClearPendingStatGroups();
		ClearPendingStatGroups();
#endif

#if WITH_EDITOR && !UE_BUILD_SHIPPING
		// tick automation controller (Editor only)
		{
			QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_Tick_AutomationController);
			static FName AutomationController("AutomationController");
			if (FModuleManager::Get().IsModuleLoaded(AutomationController))
			{
				FModuleManager::GetModuleChecked<IAutomationControllerModule>(AutomationController).Tick();
			}
		}
#endif

#if WITH_ENGINE && WITH_AUTOMATION_WORKER
		// tick automation worker
		{
			QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_Tick_AutomationWorker);
			static const FName AutomationWorkerModuleName = TEXT("AutomationWorker");
			if (FModuleManager::Get().IsModuleLoaded(AutomationWorkerModuleName))
			{
				FModuleManager::GetModuleChecked<IAutomationWorkerModule>(AutomationWorkerModuleName).Tick();
			}
		}
#endif

		// tick render hardware interface
		{			
			SCOPE_CYCLE_COUNTER(STAT_RHITickTime);
			RHITick( FApp::GetDeltaTime() ); // Update RHI.
		}

		// We need to set this marker before EndFrameRenderThread is enqueued. 
		// If multithreaded rendering is off, it can cause a bad ordering of game and rendering markers.
		GEngine->SetSimulationLatencyMarkerEnd(CurrentFrameCounter);

		// Increment global frame counter. Once for each engine tick.
		GFrameCounter++;

		ENQUEUE_RENDER_COMMAND(FrameCounter)(
			[CurrentFrameCounter = GFrameCounter](FRHICommandListImmediate& RHICmdList)
		{
			GFrameCounterRenderThread = CurrentFrameCounter;
		});

		// Disregard first few ticks for total tick time as it includes loading and such.
		if (GFrameCounter > 6)
		{
			TotalTickTime += FApp::GetDeltaTime();
		}

		// Find the objects which need to be cleaned up the next frame.
		FPendingCleanupObjects* PreviousPendingCleanupObjects = PendingCleanupObjects;
		PendingCleanupObjects = GetPendingCleanupObjects();

		{
			SCOPE_CYCLE_COUNTER(STAT_FrameSyncTime);
			// this could be perhaps moved down to get greater parallelism
			// Sync game and render thread. Either total sync or allowing one frame lag.
			static FFrameEndSync FrameEndSync;
			static auto CVarAllowOneFrameThreadLag = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.OneFrameThreadLag"));
			FrameEndSync.Sync( CVarAllowOneFrameThreadLag->GetValueOnGameThread() != 0 );
		}

		// tick core ticker, threads & deferred commands
		{
			SCOPE_CYCLE_COUNTER(STAT_DeferredTickTime);
			CSV_SCOPED_TIMING_STAT_EXCLUSIVE(DeferredTickTime);
			// Delete the objects which were enqueued for deferred cleanup before the previous frame.
			delete PreviousPendingCleanupObjects;

#if WITH_COREUOBJECT
			DeleteLoaders(); // destroy all linkers pending delete
#endif

			FTSTicker::GetCoreTicker().Tick(FApp::GetDeltaTime());
			FThreadManager::Get().Tick();
			GEngine->TickDeferredCommands();		
		}
		FMoviePlayerProxy::BlockingForceFinished();

#if !UE_SERVER
		// tick media framework
		static const FName MediaModuleName(TEXT("Media"));
		IMediaModule* MediaModule = FModuleManager::LoadModulePtr<IMediaModule>(MediaModuleName);
		if (MediaModule != nullptr)
		{
			QUICK_SCOPE_CYCLE_COUNTER(STAT_FEngineLoop_MediaTickPostRender);
			MediaModule->TickPostRender();
		}
#endif

		FCoreDelegates::OnEndFrame.Broadcast();

		// end of RDG resource dump
		#if WITH_ENGINE && WITH_DUMPGPU
			FRDGBuilder::EndResourceDump();
		#endif

		#if !UE_SERVER && WITH_ENGINE
		{
			// We emit dynamic resolution's end frame right before RHI's. GEngine is going to ignore it if no BeginFrame was done.
			GEngine->EmitDynamicResolutionEvent(EDynamicResolutionStateEvent::EndFrame);
		}
		#endif

		// end of RHI frame
		ENQUEUE_RENDER_COMMAND(EndFrame)(
			[CurrentFrameCounter](FRHICommandListImmediate& RHICmdList)
			{
				EndFrameRenderThread(RHICmdList, CurrentFrameCounter);
			});

		// Set CPU utilization stats.
		const FCPUTime CPUTime = FPlatformTime::GetCPUTime();
		SET_FLOAT_STAT( STAT_CPUTimePct, CPUTime.CPUTimePct );
		SET_FLOAT_STAT( STAT_CPUTimePctRelative, CPUTime.CPUTimePctRelative );

		// Set the UObject count stat
#if UE_GC_TRACK_OBJ_AVAILABLE
		SET_DWORD_STAT(STAT_Hash_NumObjects, GUObjectArray.GetObjectArrayNumMinusAvailable());
#endif
	}

	TRACE_END_FRAME(TraceFrameType_Game);

#if BUILD_EMBEDDED_APP
	static double LastSleepTime = FPlatformTime::Seconds();
	double TimeNow = FPlatformTime::Seconds();
	if (LastSleepTime > 0 && TimeNow - LastSleepTime >= CVarSecondsBeforeEmbeddedAppSleeps.GetValueOnAnyThread())
	{
		LastSleepTime = 0;
		FEmbeddedCommunication::AllowSleep(TEXT("FirstTicks"));
	}
#endif
}


void FEngineLoop::ClearPendingCleanupObjects()
{
	delete PendingCleanupObjects;
	PendingCleanupObjects = nullptr;
}

#endif // WITH_ENGINE


static TAutoConsoleVariable<int32> CVarLogTimestamp(
	TEXT("log.Timestamp"),
	1,
	TEXT("Defines if time is included in each line in the log file and in what form. Layout: [time][frame mod 1000]\n"
	     "  0 = Do not display log timestamps\n"
	     "  1 = Log time stamps in UTC and frame time (default) e.g. [2015.11.25-21.28.50:803][376]\n"
	     "  2 = Log timestamps in seconds elapsed since GStartTime e.g. [0130.29][420]"
	     "  3 = Log timestamps in local time and frame time e.g. [2017.08.04-17.59.50:803][420]"
	     "  4 = Log timestamps with the engine's timecode and frame time e.g. [17:59:50:18][420]"),
	ECVF_Default);


static TAutoConsoleVariable<int32> CVarLogCategory(
	TEXT("log.Category"),
	1,
	TEXT("Defines if the categoy is included in each line in the log file and in what form.\n"
	     "  0 = Do not log category\n"
	     "  2 = Log the category (default)"),
	ECVF_Default);


// Gets called any time cvars change (on the main thread)
static void CVarLogSinkFunction()
{
	{
		// for debugging
		ELogTimes::Type OldGPrintLogTimes = GPrintLogTimes;

		int32 LogTimestampValue = CVarLogTimestamp.GetValueOnGameThread();

		// Note GPrintLogTimes can be used on multiple threads but it should be no issue to change it on the fly
		switch(LogTimestampValue)
		{
			default:
			case 0: GPrintLogTimes = ELogTimes::None; break;
			case 1: GPrintLogTimes = ELogTimes::UTC; break;
			case 2: GPrintLogTimes = ELogTimes::SinceGStartTime; break;
			case 3: GPrintLogTimes = ELogTimes::Local; break;
			case 4: GPrintLogTimes = ELogTimes::Timecode; break;
		}
	}

	{
		int32 LogCategoryValue = CVarLogCategory.GetValueOnGameThread();

		// Note GPrintLogCategory can be used on multiple threads but it should be no issue to change it on the fly
		GPrintLogCategory = LogCategoryValue != 0;
	}
}


FAutoConsoleVariableSink CVarLogSink(FConsoleCommandDelegate::CreateStatic(&CVarLogSinkFunction));

static void CheckForPrintTimesOverride()
{
	// Determine whether to override the default setting for including timestamps in the log.
	FString LogTimes;
	if (GConfig->GetString( TEXT( "LogFiles" ), TEXT( "LogTimes" ), LogTimes, GEngineIni ))
	{
		if (LogTimes == TEXT( "None" ))
		{
			CVarLogTimestamp->Set((int)ELogTimes::None, ECVF_SetBySystemSettingsIni);
		}
		else if (LogTimes == TEXT( "UTC" ))
		{
			CVarLogTimestamp->Set((int)ELogTimes::UTC, ECVF_SetBySystemSettingsIni);
		}
		else if (LogTimes == TEXT( "SinceStart" ))
		{
			CVarLogTimestamp->Set((int)ELogTimes::SinceGStartTime, ECVF_SetBySystemSettingsIni);
		}
		else if (LogTimes == TEXT( "Local" ))
		{
			CVarLogTimestamp->Set((int)ELogTimes::Local, ECVF_SetBySystemSettingsIni);
		}
		else if (LogTimes == TEXT( "Timecode" ))
		{
			CVarLogTimestamp->Set((int)ELogTimes::Timecode, ECVF_SetBySystemSettingsIni);
		}
		// Assume this is a bool for backward compatibility
		else if (FCString::ToBool( *LogTimes ))
		{
			CVarLogTimestamp->Set((int)ELogTimes::UTC, ECVF_SetBySystemSettingsIni);
		}
	}

	if (FParse::Param( FCommandLine::Get(), TEXT( "LOGTIMES" ) ))
	{
		CVarLogTimestamp->Set((int)ELogTimes::UTC, ECVF_SetByCommandline);
	}
	else if (FParse::Param( FCommandLine::Get(), TEXT( "UTCLOGTIMES" ) ))
	{
		CVarLogTimestamp->Set((int)ELogTimes::UTC, ECVF_SetByCommandline);
	}
	else if (FParse::Param( FCommandLine::Get(), TEXT( "NOLOGTIMES" ) ))
	{
		CVarLogTimestamp->Set((int)ELogTimes::None, ECVF_SetByCommandline);
	}
	else if (FParse::Param( FCommandLine::Get(), TEXT( "LOGTIMESINCESTART" ) ))
	{
		CVarLogTimestamp->Set((int)ELogTimes::SinceGStartTime, ECVF_SetByCommandline);
	}
	else if (FParse::Param( FCommandLine::Get(), TEXT( "LOCALLOGTIMES" ) ))
	{
		CVarLogTimestamp->Set((int)ELogTimes::Local, ECVF_SetByCommandline);
	}
	else if (FParse::Param(FCommandLine::Get(), TEXT( "LOGTIMECODE" )))
	{
		CVarLogTimestamp->Set((int)ELogTimes::Timecode, ECVF_SetByCommandline);
	}
}

#if UE_EDITOR
//Standardize paths when deciding  if running the proper editor exe. 
void CleanUpPath(FString& InPath)
{
	//Converts to full path will also replace '\' with '/' and will collapse relative directories (C:\foo\..\bar to C:\bar)
	InPath = FPaths::ConvertRelativePathToFull(InPath);
	FPaths::RemoveDuplicateSlashes(InPath);
}

bool LaunchCorrectEditorExecutable(const FString& EditorTargetFileName)
{
	// Don't allow relaunching the executable if we're running some unattended scripted process.
	if(FApp::IsUnattended())
	{
		return false;
	}

	// Figure out the executable that we should be running
	FString LaunchExecutableName;
	if(EditorTargetFileName.Len() == 0)
	{
		LaunchExecutableName = FPlatformProcess::GenerateApplicationPath(TEXT("UnrealEditor"), FApp::GetBuildConfiguration());
	}
	else
	{
		FTargetReceipt Receipt;
		if(!FPaths::FileExists(EditorTargetFileName) || !Receipt.Read(EditorTargetFileName))
		{
			return false;
		}
		LaunchExecutableName = Receipt.Launch;
	}
	CleanUpPath(LaunchExecutableName);

	// Get the current executable name. Don't allow relaunching if we're running the console app.
	FString CurrentExecutableName = FPlatformProcess::ExecutablePath();
	if(FPaths::GetBaseFilename(CurrentExecutableName).EndsWith(TEXT("-Cmd")))
	{
		return false;
	}
	CleanUpPath(CurrentExecutableName);

	// Nothing to do if they're the same
	if(FPaths::IsSamePath(LaunchExecutableName, CurrentExecutableName))
	{
		return false;
	}

	// Relaunch the correct executable
	UE_LOG(LogInit, Display, TEXT("Running incorrect executable for target (%s). Launching %s instead..."), *CurrentExecutableName, *LaunchExecutableName);
	FPlatformProcess::CreateProc(*IFileManager::Get().ConvertToAbsolutePathForExternalAppForRead(*LaunchExecutableName), FCommandLine::GetOriginal(), true, false, false, nullptr, 0, nullptr, nullptr, nullptr);
	return true;
}
#endif

/* FEngineLoop static interface
 *****************************************************************************/

bool FEngineLoop::AppInit( )
{
	{
		SCOPED_BOOT_TIMING("BeginInitTextLocalization");
		BeginInitTextLocalization();
	}



	// Error history.
	FCString::Strcpy(GErrorHist, TEXT("Fatal error!" LINE_TERMINATOR_ANSI LINE_TERMINATOR_ANSI));

	// Platform specific pre-init.
	{
		SCOPED_BOOT_TIMING("FPlatformMisc::PlatformPreInit");
		FPlatformMisc::PlatformPreInit();
	}
#if WITH_APPLICATION_CORE
	{
		SCOPED_BOOT_TIMING("FPlatformApplicationMisc::PreInit");
		FPlatformApplicationMisc::PreInit();
	}
#endif

	// Keep track of start time.
	GSystemStartTime = FDateTime::Now().ToString();

	// Switch into executable's directory.
	FPlatformProcess::SetCurrentWorkingDirectoryToBaseDir();

	{
		SCOPED_BOOT_TIMING("IFileManager::Get().ProcessCommandLineOptions()");
		// Now finish initializing the file manager after the command line is set up
		IFileManager::Get().ProcessCommandLineOptions();
	}

	FPageAllocator::Get().LatchProtectedMode();

	if (FParse::Param(FCommandLine::Get(), TEXT("purgatorymallocproxy")))
	{
		FMemory::EnablePurgatoryTests();
	}

	if (FParse::Param(FCommandLine::Get(), TEXT("poisonmallocproxy")))
	{
		FMemory::EnablePoisonTests();
	}

#if !UE_BUILD_SHIPPING
	if (FParse::Param(FCommandLine::Get(), TEXT("BUILDMACHINE")))
	{
		GIsBuildMachine = true;
		// propagate to subprocesses, especially because some - like ShaderCompileWorker - use DDC, for which this switch matters
		FCommandLine::AddToSubprocessCommandline(TEXT(" -buildmachine"));
	}
#endif // !UE_BUILD_SHIPPING

#if PLATFORM_WINDOWS

	// make sure that the log directory tree exists
	IFileManager::Get().MakeDirectory( *FPaths::ProjectLogDir(), true );

	// update the mini dump filename now that we have enough info to point it to the log folder even in installed builds
	FCString::Strcpy(MiniDumpFilenameW, *IFileManager::Get().ConvertToAbsolutePathForExternalAppForWrite(*FString::Printf(TEXT("%sunreal-v%i-%s.dmp"), *FPaths::ProjectLogDir(), FEngineVersion::Current().GetChangelist(), *FDateTime::Now().ToString())));
#endif
	{
		SCOPED_BOOT_TIMING("FPlatformOutputDevices::SetupOutputDevices");
		// Init logging to disk
		FPlatformOutputDevices::SetupOutputDevices();
	}

	{
		SCOPED_BOOT_TIMING("FConfigCacheIni::InitializeConfigSystem");
		LLM_SCOPE(ELLMTag::ConfigSystem);
		// init config system
		FConfigCacheIni::InitializeConfigSystem();
	}

	// Apply config driven presets
	FTraceAuxiliary::InitializePresets(FCommandLine::Get());

	FDelayedAutoRegisterHelper::RunAndClearDelayedAutoRegisterDelegates(EDelayedRegisterRunPhase::IniSystemReady);

	// Load "asap" plugin modules
	IPluginManager&  PluginManager = IPluginManager::Get();
	IProjectManager& ProjectManager = IProjectManager::Get();
	if (!ProjectManager.LoadModulesForProject(ELoadingPhase::EarliestPossible) || !PluginManager.LoadModulesForEnabledPlugins(ELoadingPhase::EarliestPossible))
	{
		return false;
	}

	FDelayedAutoRegisterHelper::RunAndClearDelayedAutoRegisterDelegates(EDelayedRegisterRunPhase::EarliestPossiblePluginsLoaded);

	{
		SCOPED_BOOT_TIMING("FPlatformStackWalk::Init");
		// Now that configs have been initialized, setup stack walking options
		FPlatformStackWalk::Init();
	}

	CheckForPrintTimesOverride();

	// Check whether the project or any of its plugins are missing or are out of date
#if UE_EDITOR && !IS_MONOLITHIC
	if(!GIsBuildMachine && !FApp::IsUnattended() && FPaths::IsProjectFilePathSet())
	{
		// Check all the plugins are present
		if(!PluginManager.AreRequiredPluginsAvailable())
		{
			return false;
		}

		// Find the editor target
		FString EditorTargetFileName;
		FString DefaultEditorTarget;
		GConfig->GetString(TEXT("/Script/BuildSettings.BuildSettings"), TEXT("DefaultEditorTarget"), DefaultEditorTarget, GEngineIni);

		for (const FTargetInfo& Target : FDesktopPlatformModule::Get()->GetTargetsForProject(FPaths::GetProjectFilePath()))
		{
			if (Target.Type == EBuildTargetType::Editor && (DefaultEditorTarget.Len() == 0 || Target.Name == DefaultEditorTarget))
			{
				if (FPaths::IsUnderDirectory(Target.Path, FPlatformMisc::ProjectDir()))
				{
					EditorTargetFileName = FTargetReceipt::GetDefaultPath(FPlatformMisc::ProjectDir(), *Target.Name, FPlatformProcess::GetBinariesSubdirectory(), FApp::GetBuildConfiguration(), nullptr);
				}
				else if (FPaths::IsUnderDirectory(Target.Path, FPaths::EngineDir()))
				{
					EditorTargetFileName = FTargetReceipt::GetDefaultPath(*FPaths::EngineDir(), *Target.Name, FPlatformProcess::GetBinariesSubdirectory(), FApp::GetBuildConfiguration(), nullptr);
				}
				break;
			}
		}

		// If we're not running the correct executable for the current target, and the listed executable exists, run that instead
		if(LaunchCorrectEditorExecutable(EditorTargetFileName))
		{
			return false;
		}

		// Check if we need to compile
		bool bNeedCompile = false;
		GConfig->GetBool(TEXT("/Script/UnrealEd.EditorLoadingSavingSettings"), TEXT("bForceCompilationAtStartup"), bNeedCompile, GEditorPerProjectIni);
		if(FParse::Param(FCommandLine::Get(), TEXT("SKIPCOMPILE")) || FParse::Param(FCommandLine::Get(), TEXT("MULTIPROCESS")))
		{
			bNeedCompile = false;
		}
		if(!bNeedCompile)
		{
			// Check if any of the project or plugin modules are out of date, and the user wants to compile them.
			TArray<FString> IncompatibleFiles;
			ProjectManager.CheckModuleCompatibility(IncompatibleFiles);

			TArray<FString> IncompatibleEngineFiles;
			PluginManager.CheckModuleCompatibility(IncompatibleFiles, IncompatibleEngineFiles);

			if (IncompatibleFiles.Num() > 0)
			{
				// Log the modules which need to be rebuilt
				for (int Idx = 0; Idx < IncompatibleFiles.Num(); Idx++)
				{
					UE_LOG(LogInit, Warning, TEXT("Incompatible or missing module: %s"), *IncompatibleFiles[Idx]);
				}

				// Build the error message for the dialog box
				FString ModulesList = TEXT("The following modules are missing or built with a different engine version:\n\n");

				int NumModulesToDisplay = (IncompatibleFiles.Num() <= 20)? IncompatibleFiles.Num() : 15;
				for (int Idx = 0; Idx < NumModulesToDisplay; Idx++)
				{
					ModulesList += FString::Printf(TEXT("  %s\n"), *IncompatibleFiles[Idx]);
				}
				if(IncompatibleFiles.Num() > NumModulesToDisplay)
				{
					ModulesList += FString::Printf(TEXT("  (+%d others, see log for details)\n"), IncompatibleFiles.Num() - NumModulesToDisplay);
				}

				// If we're running with -stdout, assume that we're a non interactive process and about to fail
				if (FApp::IsUnattended() || FParse::Param(FCommandLine::Get(), TEXT("stdout")))
				{
					return false;
				}

				// If there are any engine modules that need building, force the user to build through the IDE
				if(IncompatibleEngineFiles.Num() > 0)
				{
					FString CompileForbidden = ModulesList + TEXT("\nEngine modules cannot be compiled at runtime. Please build through your IDE.");
					FPlatformMisc::MessageBoxExt(EAppMsgType::Ok, *CompileForbidden, TEXT("Missing Modules"));
					return false;
				}

				// Ask whether to compile before continuing
				FString CompilePrompt = ModulesList + TEXT("\nWould you like to rebuild them now?");
				if (FPlatformMisc::MessageBoxExt(EAppMsgType::YesNo, *CompilePrompt, *FString::Printf(TEXT("Missing %s Modules"), FApp::GetProjectName())) == EAppReturnType::No)
				{
					return false;
				}

				bNeedCompile = true;
			}
			else if(EditorTargetFileName.Len() > 0 && !FPaths::FileExists(EditorTargetFileName))
			{
				// Prompt to compile. The target file isn't essential, but we 
				if (FPlatformMisc::MessageBoxExt(EAppMsgType::YesNo, *FString::Printf(TEXT("The %s file does not exist. Would you like to build the editor?"), *FPaths::GetCleanFilename(EditorTargetFileName)), TEXT("Missing target file")) == EAppReturnType::Yes)
				{
					bNeedCompile = true;
				}
			}
		}

		FEmbeddedCommunication::ForceTick(16);
		
		if(bNeedCompile)
		{
			// Try to compile it
			FFeedbackContext *Context = (FFeedbackContext*)FDesktopPlatformModule::Get()->GetNativeFeedbackContext();
			Context->BeginSlowTask(FText::FromString(TEXT("Starting build...")), true, true);
			ECompilationResult::Type CompilationResult = ECompilationResult::Unknown;
			bool bCompileResult = FDesktopPlatformModule::Get()->CompileGameProject(FPaths::RootDir(), FPaths::GetProjectFilePath(), Context, &CompilationResult);
			Context->EndSlowTask();

			// Check if we're running the wrong executable now
			if(bCompileResult && LaunchCorrectEditorExecutable(EditorTargetFileName))
			{
				return false;
			}

			// Check if we needed to modify engine files
			if (!bCompileResult && CompilationResult == ECompilationResult::FailedDueToEngineChange)
			{
				FPlatformMisc::MessageBoxExt(EAppMsgType::Ok, TEXT("Engine modules are out of date, and cannot be compiled while the engine is running. Please build through your IDE."), TEXT("Missing Modules"));
				return false;
			}

			// Get a list of modules which are still incompatible
			TArray<FString> StillIncompatibleFiles;
			ProjectManager.CheckModuleCompatibility(StillIncompatibleFiles);

			TArray<FString> StillIncompatibleEngineFiles;
			PluginManager.CheckModuleCompatibility(StillIncompatibleFiles, StillIncompatibleEngineFiles);

			if(!bCompileResult || StillIncompatibleFiles.Num() > 0)
			{
				for (int Idx = 0; Idx < StillIncompatibleFiles.Num(); Idx++)
				{
					UE_LOG(LogInit, Warning, TEXT("Still incompatible or missing module: %s"), *StillIncompatibleFiles[Idx]);
				}
				if (!FApp::IsUnattended())
				{
					FPlatformMisc::MessageBoxExt(EAppMsgType::Ok, *FString::Printf(TEXT("%s could not be compiled. Try rebuilding from source manually."), FApp::GetProjectName()), TEXT("Error"));
				}
				return false;
			}
		}
	}
#endif

	// Put the command line and config info into the suppression system (before plugins start loading)
	FLogSuppressionInterface::Get().ProcessConfigAndCommandLine();

#if PLATFORM_IOS || PLATFORM_TVOS
	// Now that the config system is ready, init the audio system.
	[[IOSAppDelegate GetDelegate] InitializeAudioSession];
#endif

	
	// NOTE: This is the earliest place to init the online subsystems (via plugins)
	// Code needs GConfigFile to be valid
	// Must be after FThreadStats::StartThread();
	// Must be before Render/RHI subsystem D3DCreate() for platform services that need D3D hooks like Steam

	{
		SCOPED_BOOT_TIMING("Load pre-init plugin modules");
		// Load "pre-init" plugin modules
		if (!ProjectManager.LoadModulesForProject(ELoadingPhase::PostConfigInit) || !PluginManager.LoadModulesForEnabledPlugins(ELoadingPhase::PostConfigInit))
		{
			return false;
		}
	}

	// Register the callback that allows the text localization manager to load data for plugins
	FCoreDelegates::GatherAdditionalLocResPathsCallback.AddLambda([](TArray<FString>& OutLocResPaths)
	{
		IPluginManager::Get().GetLocalizationPathsForEnabledPlugins(OutLocResPaths);
	});

	FEmbeddedCommunication::ForceTick(17);

	PreInitHMDDevice();

	// after the above has run we now have the REQUIRED set of engine .INIs  (all of the other .INIs)
	// that are gotten from .h files' config() are not requires and are dynamically loaded when the .u files are loaded

#if !UE_BUILD_SHIPPING
	// Prompt the user for remote debugging?
	bool bPromptForRemoteDebug = false;
	GConfig->GetBool(TEXT("Engine.ErrorHandling"), TEXT("bPromptForRemoteDebugging"), bPromptForRemoteDebug, GEngineIni);
	bool bPromptForRemoteDebugOnEnsure = false;
	GConfig->GetBool(TEXT("Engine.ErrorHandling"), TEXT("bPromptForRemoteDebugOnEnsure"), bPromptForRemoteDebugOnEnsure, GEngineIni);

	if (FParse::Param(FCommandLine::Get(), TEXT("PROMPTREMOTEDEBUG")))
	{
		bPromptForRemoteDebug = true;
	}

	if (FParse::Param(FCommandLine::Get(), TEXT("PROMPTREMOTEDEBUGENSURE")))
	{
		bPromptForRemoteDebug = true;
		bPromptForRemoteDebugOnEnsure = true;
	}

	FPlatformMisc::SetShouldPromptForRemoteDebugging(bPromptForRemoteDebug);
	FPlatformMisc::SetShouldPromptForRemoteDebugOnEnsure(bPromptForRemoteDebugOnEnsure);

	// Feedback context.
	if (FParse::Param(FCommandLine::Get(), TEXT("WARNINGSASERRORS")))
	{
		GWarn->TreatWarningsAsErrors = true;
	}

	if (FParse::Param(FCommandLine::Get(), TEXT("SILENT")))
	{
		GIsSilent = true;
	}

	if (FParse::Param(FCommandLine::Get(), TEXT("RUNNINGUNATTENDEDSCRIPT")))
	{
		GIsRunningUnattendedScript = true;
	}

#endif // !UE_BUILD_SHIPPING

	// Show log if wanted.
	if (GLogConsole && FParse::Param(FCommandLine::Get(), TEXT("LOG")))
	{
		GLogConsole->Show(true);
	}

	// Print all initial startup logging
	FApp::PrintStartupLogMessages();

	// if a logging build, clear out old log files. Avoid races when multiple processes are running at once.
#if !NO_LOGGING
	if (!FParse::Param(FCommandLine::Get(), TEXT("MULTIPROCESS")))
	{
		FMaintenance::DeleteOldLogs();
	}
#endif

#if !UE_BUILD_SHIPPING
	{
		SCOPED_BOOT_TIMING("FApp::InitializeSession");
		FApp::InitializeSession();
	}
#endif

#if PLATFORM_USE_PLATFORM_FILE_MANAGED_STORAGE_WRAPPER
	// Delay initialization of FPersistentStorageManager to a point where GConfig is initialized
	FPersistentStorageManager::Get().Initialize();
#endif

	// Checks.
	check(sizeof(uint8) == 1);
	check(sizeof(int8) == 1);
	check(sizeof(uint16) == 2);
	check(sizeof(uint32) == 4);
	check(sizeof(uint64) == 8);
	check(sizeof(ANSICHAR) == 1);

#if PLATFORM_TCHAR_IS_4_BYTES
	check(sizeof(TCHAR) == 4);
#else
	check(sizeof(TCHAR) == 2);
#endif

	check(sizeof(int16) == 2);
	check(sizeof(int32) == 4);
	check(sizeof(int64) == 8);
	check(sizeof(bool) == 1);
	check(sizeof(float) == 4);
	check(sizeof(double) == 8);

	// Init list of common colors.
	GColorList.CreateColorMap();

	bool bForceSmokeTests = false;
	GConfig->GetBool(TEXT("AutomationTesting"), TEXT("bForceSmokeTests"), bForceSmokeTests, GEngineIni);
	bForceSmokeTests |= FParse::Param(FCommandLine::Get(), TEXT("bForceSmokeTests"));
	FAutomationTestFramework::Get().SetForceSmokeTests(bForceSmokeTests);

	FEmbeddedCommunication::ForceTick(18);

	// Init other systems.
	{
		SCOPED_BOOT_TIMING("FCoreDelegates::OnInit.Broadcast");
		FCoreDelegates::OnInit.Broadcast();
	}

#if WITH_EDITOR
	if (FPIEPreviewDeviceModule::IsRequestingPreviewDevice())
	{
		FPIEPreviewDeviceModule* PIEPreviewDeviceProfileSelectorModule = FModuleManager::LoadModulePtr<FPIEPreviewDeviceModule>("PIEPreviewDeviceProfileSelector");
		if (PIEPreviewDeviceProfileSelectorModule)
		{
			Scalability::ChangeScalabilityPreviewPlatform(PIEPreviewDeviceProfileSelectorModule->GetPreviewPlatformName());
		}
	}
#endif

	FEmbeddedCommunication::ForceTick(19);

	return true;
}


void FEngineLoop::AppPreExit( )
{
	SCOPED_BOOT_TIMING("AppPreExit");

	UE_LOG(LogExit, Log, TEXT("Preparing to exit.") );

	FCoreDelegates::OnPreExit.Broadcast();

	MALLOC_PROFILER( GMalloc->Exec(nullptr, TEXT("MPROF STOP"), *GLog);	);

#if WITH_ENGINE
	if (FString(FCommandLine::Get()).Contains(TEXT("CreatePak")) && GetDerivedDataCache())
	{
		// if we are creating a Pak, we need to make sure everything is done and written before we exit
		UE_LOG(LogInit, Display, TEXT("Closing DDC Pak File."));
		GetDerivedDataCacheRef().WaitForQuiescence(true);
	}
#endif

#if WITH_EDITOR
	FRemoteConfig::Flush();
#endif

	FCoreDelegates::OnExit.Broadcast();

	// FGenericRHIGPUFence uses GFrameNumberRenderThread to tell when a frame is finished. If such an object is added in the last frame before we
	// exit, it will never be "signaled", since nothing ever increments GFrameNumberRenderThread again. This can lead to deadlocks in code
	// which uses async tasks to wait until resources are safe to be deleted (for example, FMediaTextureResource).
	// To avoid this, we set the frame number to the maximum possible value here, before waiting for the thread pool to die. It's safe to do so
	// because FlushRenderingCommands() is called multiple times on exit before reaching this point, so there's no way the render thread has any
	// more frames in flight. Note that simply incrementing the value doesn't work, because FGenericRHIGPUFence::WriteInternal adds
	// GNumAlternateFrameRenderingGroups to the current frame number to account for multi-GPU, and we don't want to depend on that RHI export here.
	GFrameNumberRenderThread = MAX_uint32;

	// Clean up the thread pool
	// GThreadPool might be a wrapper around GLargeThreadPool so we have to destroy it first
	if (GThreadPool != nullptr)
	{
		GThreadPool->Destroy();
	}

#if WITH_EDITOR
	if (GLargeThreadPool != nullptr)
	{
		GLargeThreadPool->Destroy();
	}
#endif // WITH_EDITOR

	if (GBackgroundPriorityThreadPool != nullptr)
	{
		GBackgroundPriorityThreadPool->Destroy();
	}

	if (GIOThreadPool != nullptr)
	{
		GIOThreadPool->Destroy();
	}

#if WITH_ENGINE
	if ( GShaderCompilingManager )
	{
		delete GShaderCompilingManager;
		GShaderCompilingManager = nullptr;
	}
	if(GShaderCompilerStats)
	{
		delete GShaderCompilerStats;
		GShaderCompilerStats = nullptr;
	}

#if WITH_ODSC
	if (GODSCManager)
	{
		delete GODSCManager;
		GODSCManager = nullptr;
	}
#endif

#else
#if WITH_COREUOBJECT
	// Shutdown the PackageResourceManager in AppPreExit for programs that do not call FEngineLoop::Exit
	IPackageResourceManager::Shutdown();
#endif
#endif

}


void FEngineLoop::AppExit()
{
	// when compiled WITH_ENGINE, this will happen in FEngineLoop::Exit()
#if !WITH_ENGINE
#if STATS
	FThreadStats::StopThread();
#endif
	FTaskGraphInterface::Shutdown();
#endif // WITH_ENGINE

	UE_LOG(LogExit, Log, TEXT("Exiting."));

#if WITH_APPLICATION_CORE
	FPlatformApplicationMisc::TearDown();
#endif
	FPlatformMisc::PlatformTearDown();

	if (GConfig)
	{
		GConfig->Exit();
		delete GConfig;
		GConfig = nullptr;
	}

	if( GLog )
	{
		GLog->TearDown();
	}

	FTextLocalizationManager::TearDown();
	FInternationalization::TearDown();

	FTraceAuxiliary::Shutdown();
}

void FEngineLoop::PostInitRHI()
{
#if WITH_ENGINE
	TArray<uint32> PixelFormatByteWidth;
	PixelFormatByteWidth.AddUninitialized(PF_MAX);
	for (int i = 0; i < PF_MAX; i++)
	{
		PixelFormatByteWidth[i] = GPixelFormats[i].BlockBytes;
	}
	RHIPostInit(PixelFormatByteWidth);

#if WITH_ENGINE && (!UE_BUILD_SHIPPING)
	IRHITestModule* RHIUnitTests = static_cast<IRHITestModule*>(FModuleManager::Get().GetModule(TEXT("RHITests")));
	if (RHIUnitTests)
	{
		RHIUnitTests->RunAllTests();
	}
#endif //(!UE_BUILD_SHIPPING)

#endif
}

void FEngineLoop::PreInitHMDDevice()
{
#if WITH_ENGINE && !UE_SERVER
	if (!FParse::Param(FCommandLine::Get(), TEXT("nohmd")) && !FParse::Param(FCommandLine::Get(), TEXT("emulatestereo")))
	{
		// Get a list of modules that implement this feature
		FName Type = IHeadMountedDisplayModule::GetModularFeatureName();
		IModularFeatures& ModularFeatures = IModularFeatures::Get();
		TArray<IHeadMountedDisplayModule*> HMDModules = ModularFeatures.GetModularFeatureImplementations<IHeadMountedDisplayModule>(Type);

		// Check whether the user passed in an explicit HMD module on the command line
		FString ExplicitHMDName;
		bool bUseExplicitHMDName = FParse::Value(FCommandLine::Get(), TEXT("hmd="), ExplicitHMDName);

		// Iterate over modules, checking ExplicitHMDName and calling PreInit
		for (auto HMDModuleIt = HMDModules.CreateIterator(); HMDModuleIt; ++HMDModuleIt)
		{
			IHeadMountedDisplayModule* HMDModule = *HMDModuleIt;


			bool bUnregisterHMDModule = false;
			if (bUseExplicitHMDName)
			{
				TArray<FString> HMDAliases;
				HMDModule->GetModuleAliases(HMDAliases);
				HMDAliases.Add(HMDModule->GetModuleKeyName());

				bUnregisterHMDModule = true;
				for (const FString& HMDModuleName : HMDAliases)
				{
					if (ExplicitHMDName.Equals(HMDModuleName, ESearchCase::IgnoreCase))
					{
						bUnregisterHMDModule = !HMDModule->PreInit();
						break;
					}
				}
			}
			else
			{
				bUnregisterHMDModule = !HMDModule->PreInit();
			}

			if (bUnregisterHMDModule)
			{
				// Unregister modules which don't match ExplicitHMDName, or which fail PreInit
				ModularFeatures.UnregisterModularFeature(Type, HMDModule);
			}
		}
		// Note we do not disable or warn here if no HMD modules matched ExplicitHMDName, as not all HMD plugins have been loaded yet.
	}
#endif // #if WITH_ENGINE && !UE_SERVER
}

void FPreInitContext::Cleanup()
{
#if WITH_ENGINE && !UE_SERVER
	SlateRenderer = nullptr;
#endif // WITH_ENGINE && !UE_SERVER
	CommandletCommandLine = nullptr;

	delete[] CommandLineCopy;
	CommandLineCopy = nullptr;

	delete SlowTaskPtr;
	SlowTaskPtr = nullptr;
}

#undef LOCTEXT_NAMESPACE