Main.cpp

/*          ______   ______   ______  ______  ______  __  __       ______   ______   __    __   __    __   ______   __   __   _____
           /\  ___\ /\  __ \ /\  == \/\__  _\/\  ___\/\_\_\_\     /\  ___\ /\  __ \ /\ "-./  \ /\ "-./  \ /\  __ \ /\ "-.\ \ /\  __-.
           \ \ \____\ \ \/\ \\ \  __<\/_/\ \/\ \  __\\/_/\_\/_    \ \ \____\ \ \/\ \\ \ \-./\ \\ \ \-./\ \\ \  __ \\ \ \-.  \\ \ \/\ \
            \ \_____\\ \_____\\ \_\ \_\ \ \_\ \ \_____\/\_\/\_\    \ \_____\\ \_____\\ \_\ \ \_\\ \_\ \ \_\\ \_\ \_\\ \_\\"\_\\ \____-
  	         \/_____/ \/_____/ \/_/ /_/  \/_/  \/_____/\/_/\/_/     \/_____/ \/_____/ \/_/  \/_/ \/_/  \/_/ \/_/\/_/ \/_/ \/_/ \/____/
   ______   ______   __    __   __    __   __  __   __   __   __   ______  __  __       ______  ______   ______      __   ______   ______   ______
  /\  ___\ /\  __ \ /\ "-./  \ /\ "-./  \ /\ \/\ \ /\ "-.\ \ /\ \ /\__  _\/\ \_\ \     /\  == \/\  == \ /\  __ \    /\ \ /\  ___\ /\  ___\ /\__  _\
  \ \ \____\ \ \/\ \\ \ \-./\ \\ \ \-./\ \\ \ \_\ \\ \ \-.  \\ \ \\/_/\ \/\ \____ \    \ \  _-/\ \  __< \ \ \/\ \  _\_\ \\ \  __\ \ \ \____\/_/\ \/
   \ \_____\\ \_____\\ \_\ \ \_\\ \_\ \ \_\\ \_____\\ \_\\"\_\\ \_\  \ \_\ \/\_____\    \ \_\   \ \_\ \_\\ \_____\/\_____\\ \_____\\ \_____\  \ \_\
    \/_____/ \/_____/ \/_/  \/_/ \/_/  \/_/ \/_____/ \/_/ \/_/ \/_/   \/_/  \/_____/     \/_/    \/_/ /_/ \/_____/\/_____/ \/_____/ \/_____/   \/_/

/////\\\\\/////\\\\\/////\\\\\/////\\\\\/////\\\\\/////\\\\\/////\\\\\/////\\\\\/////\\\\\/////\\\\\/////\\\\\/////\\\\\/////\\\\\/////\\\\\/////\\\\\*/

/// <summary>
/// Main driver implementation of the Retro Terrain Engine.
/// Data Realms, LLC - http://www.datarealms.com
/// Cortex Command Community Project - https://github.com/cortex-command-community
/// Cortex Command Community Project Discord - https://discord.gg/TSU6StNQUG
/// </summary>

#include "allegro.h"
#include "SDL.h"

#include "GUI.h"
#include "GUIInputWrapper.h"
#include "AllegroScreen.h"
#include "AllegroBitmap.h"

#include "MainMenuGUI.h"
#include "ScenarioGUI.h"
#include "TitleScreen.h"

#include "MenuMan.h"
#include "ConsoleMan.h"
#include "SettingsMan.h"
#include "PresetMan.h"
#include "UInputMan.h"
#include "PerformanceMan.h"
#include "MetaMan.h"
#include "WindowMan.h"
#include "NetworkServer.h"
#include "NetworkClient.h"

extern "C" { FILE __iob_func[3] = { *stdin,*stdout,*stderr }; }

using namespace RTE;

namespace RTE {

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

	/// <summary>
	/// Initializes all the essential managers.
	/// </summary>
	void InitializeManagers() {
		g_SettingsMan.Initialize();

		g_LuaMan.Initialize();
		g_NetworkServer.Initialize();
		g_NetworkClient.Initialize();
		g_TimerMan.Initialize();
		g_PerformanceMan.Initialize();
		g_WindowMan.Initialize();
		g_FrameMan.Initialize();
		g_PostProcessMan.Initialize();

		if (g_AudioMan.Initialize()) { g_GUISound.Initialize(); }

		g_UInputMan.Initialize();
		g_ConsoleMan.Initialize();
		g_SceneMan.Initialize();
		g_MovableMan.Initialize();
		g_MetaMan.Initialize();
		g_MenuMan.Initialize();

		// Overwrite Settings.ini after all the managers are created to fully populate the file. Up until this moment Settings.ini is populated only with minimal required properties to run.
		// If Settings.ini already exists and is fully populated, this will deal with overwriting it to apply any overrides performed by the managers at boot (e.g resolution validation).
		if (g_SettingsMan.SettingsNeedOverwrite()) { g_SettingsMan.UpdateSettingsFile(); }
	}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

	/// <summary>
	/// Destroys all the managers and frees all loaded data before termination.
	/// </summary>
	void DestroyManagers() {
		g_NetworkClient.Destroy();
		g_NetworkServer.Destroy();
		g_MetaMan.Destroy();
		g_PerformanceMan.Destroy();
		g_MovableMan.Destroy();
		g_SceneMan.Destroy();
		g_ActivityMan.Destroy();
		g_GUISound.Destroy();
		g_AudioMan.Destroy();
		g_PresetMan.Destroy();
		g_UInputMan.Destroy();
		g_FrameMan.Destroy();
		g_TimerMan.Destroy();
		g_LuaMan.Destroy();
		ContentFile::FreeAllLoaded();
		g_ConsoleMan.Destroy();

#ifdef DEBUG_BUILD
		Entity::ClassInfo::DumpPoolMemoryInfo(Writer("MemCleanupInfo.txt"));
#endif
	}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

	/// <summary>
	/// Command-line argument handling.
	/// </summary>
	/// <param name="argCount">Argument count.</param>
	/// <param name="argValue">Argument values.</param>
	void HandleMainArgs(int argCount, char **argValue) {
		// Discard the first argument because it's always the executable path/name
		argCount--;
		argValue++;
		if (argCount == 0) {
			return;
		}
		bool launchModeSet = false;
		bool singleModuleSet = false;

		for (int i = 0; i < argCount;) {
			std::string currentArg = argValue[i];
			bool lastArg = i + 1 == argCount;

			if (currentArg == "-cout") { System::EnableLoggingToCLI(); }

			if (currentArg == "-ext-validate") { System::EnableExternalModuleValidationMode(); }

			if (!lastArg && !singleModuleSet && currentArg == "-module") {
				std::string moduleToLoad = argValue[++i];
				if (moduleToLoad.find(System::GetModulePackageExtension()) == moduleToLoad.length() - System::GetModulePackageExtension().length()) {
					g_PresetMan.SetSingleModuleToLoad(moduleToLoad);
					singleModuleSet = true;
				}
			}
			if (!launchModeSet) {
				if (currentArg == "-server") {
					g_NetworkServer.EnableServerMode();
					g_NetworkServer.SetServerPort(!lastArg ? argValue[++i] : "8000");
					launchModeSet = true;
				} else if (!lastArg && currentArg == "-editor") {
					g_ActivityMan.SetEditorToLaunch(argValue[++i]);
					launchModeSet = true;
				}
			}
			++i;
		}
		if (launchModeSet) { g_SettingsMan.SetSkipIntro(true); }
	}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

	/// <summary>
	/// Polls the SDL event queue and passes events to be handled by the relevant managers.
	/// </summary>
	void PollSDLEvents() {
		SDL_Event sdlEvent;
		while (SDL_PollEvent(&sdlEvent)) {
			switch (sdlEvent.type) {
				case SDL_QUIT:
					System::SetQuit(true);
					break;
				case SDL_WINDOWEVENT:
					g_WindowMan.HandleWindowEvent(sdlEvent);
					break;
				case SDL_KEYUP:
				case SDL_KEYDOWN:
				case SDL_TEXTINPUT:
				case SDL_MOUSEMOTION:
				case SDL_MOUSEBUTTONUP:
				case SDL_MOUSEBUTTONDOWN:
				case SDL_MOUSEWHEEL:
				case SDL_CONTROLLERAXISMOTION:
				case SDL_CONTROLLERBUTTONDOWN:
				case SDL_CONTROLLERBUTTONUP:
				case SDL_JOYAXISMOTION:
				case SDL_JOYBUTTONDOWN:
				case SDL_JOYBUTTONUP:
				case SDL_JOYDEVICEADDED:
				case SDL_JOYDEVICEREMOVED:
					g_UInputMan.QueueInputEvent(sdlEvent);
					break;
				default:
					break;
			}
		}
	}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

	/// <summary>
	/// Game menus loop.
	/// </summary>
	void RunMenuLoop() {
		g_UInputMan.DisableKeys(false);
		g_UInputMan.TrapMousePos(false);

		while (!System::IsSetToQuit()) {
			PollSDLEvents();

			g_WindowMan.Update();

			g_UInputMan.Update();
			g_TimerMan.Update();
			g_TimerMan.UpdateSim();
			g_AudioMan.Update();

			if (g_WindowMan.ResolutionChanged()) {
				g_MenuMan.Reinitialize();
				g_ConsoleMan.Destroy();
				g_ConsoleMan.Initialize();
				g_WindowMan.CompleteResolutionChange();
			}

			if (g_MenuMan.Update()) {
				break;
			}
			g_ConsoleMan.Update();

			g_MenuMan.Draw();
			g_ConsoleMan.Draw(g_FrameMan.GetBackBuffer32());
			g_WindowMan.UploadFrame();
		}
	}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

	/// <summary>
	/// Game simulation loop.
	/// </summary>
	void RunGameLoop() {
		if (System::IsSetToQuit()) {
			return;
		}
		g_TimerMan.PauseSim(false);

		if (g_ActivityMan.ActivitySetToRestart() && !g_ActivityMan.RestartActivity()) { g_MenuMan.GetTitleScreen()->SetTitleTransitionState(TitleScreen::TitleTransition::ScrollingFadeIn); }

		long long updateStartTime = 0;
		long long updateTotalTime = 0;
		long long updateEndAndDrawStartTime = 0;
		long long drawStartTime = 0;
		long long drawTotalTime = 0;

		while (!System::IsSetToQuit()) {
			bool serverUpdated = false;
			updateStartTime = g_TimerMan.GetAbsoluteTime();

			g_TimerMan.Update();

			// Simulation update, as many times as the fixed update step allows in the span since last frame draw.
			while (g_TimerMan.TimeForSimUpdate()) {
				serverUpdated = false;

				PollSDLEvents();

				g_WindowMan.Update();

				g_PerformanceMan.NewPerformanceSample();
				g_PerformanceMan.UpdateMSPSU();
				g_TimerMan.UpdateSim();

				g_PerformanceMan.StartPerformanceMeasurement(PerformanceMan::SimTotal);

				g_UInputMan.Update();

				// It is vital that server is updated after input manager but before activity because input manager will clear received pressed and released events on next update.
				if (g_NetworkServer.IsServerModeEnabled()) {
					g_NetworkServer.Update(true);
					serverUpdated = true;
				}
				g_FrameMan.Update();
				g_LuaMan.Update();
				g_PerformanceMan.StartPerformanceMeasurement(PerformanceMan::ActivityUpdate);
				g_ActivityMan.Update();
				g_PerformanceMan.StopPerformanceMeasurement(PerformanceMan::ActivityUpdate);
				g_MovableMan.Update();
				g_AudioMan.Update();

				g_ActivityMan.LateUpdateGlobalScripts();

				// This is to support hot reloading entities in SceneEditorGUI. It's a bit hacky to put it in Main like this, but PresetMan has no update in which to clear the value, and I didn't want to set up a listener for the job.
				// It's in this spot to allow it to be set by UInputMan update and ConsoleMan update, and read from ActivityMan update.
				g_PresetMan.ClearReloadEntityPresetCalledThisUpdate();

				g_ConsoleMan.Update();
				g_PerformanceMan.StopPerformanceMeasurement(PerformanceMan::SimTotal);

				if (!g_ActivityMan.IsInActivity()) {
					g_TimerMan.PauseSim(true);
					if (g_MetaMan.GameInProgress()) {
						g_MenuMan.GetTitleScreen()->SetTitleTransitionState(TitleScreen::TitleTransition::MetaGameFadeIn);
					} else if (!g_ActivityMan.ActivitySetToRestart()) {
						const Activity *activity = g_ActivityMan.GetActivity();
						// If we edited something then return to main menu instead of scenario menu.
						if (activity && activity->GetPresetName() == "None") {
							g_MenuMan.GetTitleScreen()->SetTitleTransitionState(TitleScreen::TitleTransition::ScrollingFadeIn);
						} else {
							g_MenuMan.GetTitleScreen()->SetTitleTransitionState(TitleScreen::TitleTransition::ScenarioFadeIn);
						}
					}
					if (!g_ActivityMan.ActivitySetToRestart()) { RunMenuLoop(); }
				}
				if (g_ActivityMan.ActivitySetToRestart() && !g_ActivityMan.RestartActivity()) {
					break;
				}
				if (g_ActivityMan.ActivitySetToResume()) {
					g_ActivityMan.ResumeActivity();
					g_PerformanceMan.ResetSimUpdateTimer();
					updateStartTime = g_TimerMan.GetAbsoluteTime();
				}
			}

			if (g_NetworkServer.IsServerModeEnabled()) {
				// Pause sim while we're waiting for scene transmission or scene will start changing before clients receive them and those changes will be lost.
				g_TimerMan.PauseSim(!(g_NetworkServer.ReadyForSimulation() && g_ActivityMan.IsInActivity()));

				if (!serverUpdated) { g_NetworkServer.Update(); }

				if (g_NetworkServer.GetServerSimSleepWhenIdle()) {
					long long ticksToSleep = g_TimerMan.GetTimeToSleep();
					if (ticksToSleep > 0) {
						double secsToSleep = static_cast<double>(ticksToSleep) / static_cast<double>(g_TimerMan.GetTicksPerSecond());
						long long milisToSleep = static_cast<long long>(secsToSleep) * 1000;
						std::this_thread::sleep_for(std::chrono::milliseconds(milisToSleep));
					}
				}
			}
			updateEndAndDrawStartTime = g_TimerMan.GetAbsoluteTime();
			updateTotalTime = updateEndAndDrawStartTime - updateStartTime;
			drawStartTime = updateEndAndDrawStartTime;

			g_FrameMan.Draw();
			g_WindowMan.UploadFrame();

			drawTotalTime = g_TimerMan.GetAbsoluteTime() - drawStartTime;
			g_PerformanceMan.UpdateMSPF(updateTotalTime, drawTotalTime);
		}
	}
}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

/// <summary>
/// Implementation of the main function.
/// </summary>
int main(int argc, char **argv) {
	install_allegro(SYSTEM_NONE, &errno, std::atexit);
	loadpng_init();

	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS | SDL_INIT_GAMECONTROLLER | SDL_INIT_TIMER);

#if SDL_MINOR_VERSION > 22
	SDL_SetHint(SDL_HINT_MOUSE_AUTO_CAPTURE, "0");
#endif

	SDL_ShowCursor(SDL_DISABLE);
	SDL_SetHint("SDL_ALLOW_TOPMOST", "0");

	if (std::filesystem::exists("Base.rte/gamecontrollerdb.txt")) {
		SDL_GameControllerAddMappingsFromFile("Base.rte/gamecontrollerdb.txt");
	}

	System::Initialize();
	SeedRNG();

	InitializeManagers();

	HandleMainArgs(argc, argv);

	g_PresetMan.LoadAllDataModules();

	if (!System::IsInExternalModuleValidationMode()) {
		// Load the different input device icons. This can't be done during UInputMan::Create() because the icon presets don't exist so we need to do this after modules are loaded.
		g_UInputMan.LoadDeviceIcons();

		if (g_ConsoleMan.LoadWarningsExist()) {
			g_ConsoleMan.PrintString("WARNING: Encountered non-fatal errors during module loading!\nSee \"LogLoadingWarning.txt\" for information.");
			g_ConsoleMan.SaveLoadWarningLog("LogLoadingWarning.txt");
			// Open the console so the user is aware there are loading warnings.
			g_ConsoleMan.SetEnabled(true);
		} else {
			// Delete an existing log if there are no warnings so there's less junk in the root folder.
			if (std::filesystem::exists(System::GetWorkingDirectory() + "LogLoadingWarning.txt")) { std::remove("LogLoadingWarning.txt"); }
		}

		if (!g_ActivityMan.Initialize()) { RunMenuLoop(); }
		RunGameLoop();
	}

	DestroyManagers();

	allegro_exit();
	SDL_Quit();

	return EXIT_SUCCESS;
}

#ifdef _WIN32
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { return main(__argc, __argv); }
#endif