Update: Translations from eints

[openttd-github.git] / src / openttd.cpp

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file openttd.cpp Functions related to starting OpenTTD. */

#include "stdafx.h"

#include "blitter/factory.hpp"
#include "sound/sound_driver.hpp"
#include "music/music_driver.hpp"
#include "video/video_driver.hpp"
#include "mixer.h"

#include "fontcache.h"
#include "error.h"
#include "error_func.h"
#include "gui.h"

#include "base_media_base.h"
#include "saveload/saveload.h"
#include "company_cmd.h"
#include "company_func.h"
#include "command_func.h"
#include "news_func.h"
#include "fios.h"
#include "aircraft.h"
#include "roadveh.h"
#include "train.h"
#include "ship.h"
#include "console_func.h"
#include "screenshot.h"
#include "network/network.h"
#include "network/network_func.h"
#include "ai/ai.hpp"
#include "ai/ai_config.hpp"
#include "settings_func.h"
#include "genworld.h"
#include "progress.h"
#include "strings_func.h"
#include "vehicle_func.h"
#include "gamelog.h"
#include "animated_tile_func.h"
#include "roadstop_base.h"
#include "elrail_func.h"
#include "rev.h"
#include "highscore.h"
#include "station_base.h"
#include "crashlog.h"
#include "engine_func.h"
#include "core/random_func.hpp"
#include "rail_gui.h"
#include "road_gui.h"
#include "core/backup_type.hpp"
#include "hotkeys.h"
#include "newgrf.h"
#include "misc/getoptdata.h"
#include "game/game.hpp"
#include "game/game_config.hpp"
#include "town.h"
#include "subsidy_func.h"
#include "gfx_layout.h"
#include "viewport_func.h"
#include "viewport_sprite_sorter.h"
#include "framerate_type.h"
#include "industry.h"
#include "network/network_gui.h"
#include "network/network_survey.h"
#include "misc_cmd.h"
#include "timer/timer.h"
#include "timer/timer_game_calendar.h"
#include "timer/timer_game_economy.h"
#include "timer/timer_game_realtime.h"
#include "timer/timer_game_tick.h"
#include "social_integration.h"

#include "linkgraph/linkgraphschedule.h"

#include <system_error>

#include "safeguards.h"

#ifdef __EMSCRIPTEN__
#       include <emscripten.h>
#       include <emscripten/html5.h>
#endif

void CallLandscapeTick();
void DoPaletteAnimations();
void MusicLoop();
void CallWindowGameTickEvent();
bool HandleBootstrap();

extern void CheckCaches();
extern Company *DoStartupNewCompany(bool is_ai, CompanyID company = INVALID_COMPANY);
extern void OSOpenBrowser(const std::string &url);
extern void ShowOSErrorBox(const char *buf, bool system);
extern std::string _config_file;

bool _save_config = false;
bool _request_newgrf_scan = false;
NewGRFScanCallback *_request_newgrf_scan_callback = nullptr;

/**
 * Error handling for fatal user errors.
 * @param str the string to print.
 * @note Does NEVER return.
 */
void UserErrorI(const std::string &str)
{
        ShowOSErrorBox(str.c_str(), false);
        if (VideoDriver::GetInstance() != nullptr) VideoDriver::GetInstance()->Stop();

#ifdef __EMSCRIPTEN__
        emscripten_exit_pointerlock();
        /* In effect, the game ends here. As emscripten_set_main_loop() caused
         * the stack to be unwound, the code after MainLoop() in
         * openttd_main() is never executed. */
        EM_ASM(if (window["openttd_abort"]) openttd_abort());
#endif

        _exit(1);
}

/**
 * Error handling for fatal non-user errors.
 * @param str the string to print.
 * @note Does NEVER return.
 */
void FatalErrorI(const std::string &str)
{
        if (VideoDriver::GetInstance() == nullptr || VideoDriver::GetInstance()->HasGUI()) {
                ShowOSErrorBox(str.c_str(), true);
        }

        /* Set the error message for the crash log and then invoke it. */
        CrashLog::SetErrorMessage(str);
        abort();
}

/**
 * Show the help message when someone passed a wrong parameter.
 */
static void ShowHelp()
{
        std::string str;
        str.reserve(8192);

        std::back_insert_iterator<std::string> output_iterator = std::back_inserter(str);
        fmt::format_to(output_iterator, "OpenTTD {}\n", _openttd_revision);
        str +=
                "\n"
                "\n"
                "Command line options:\n"
                "  -v drv              = Set video driver (see below)\n"
                "  -s drv              = Set sound driver (see below)\n"
                "  -m drv              = Set music driver (see below)\n"
                "  -b drv              = Set the blitter to use (see below)\n"
                "  -r res              = Set resolution (for instance 800x600)\n"
                "  -h                  = Display this help text\n"
                "  -t year             = Set starting year\n"
                "  -d [[fac=]lvl[,...]]= Debug mode\n"
                "  -e                  = Start Editor\n"
                "  -g [savegame|scenario|heightmap] = Start new/savegame/scenario/heightmap immediately\n"
                "  -G seed             = Set random seed\n"
                "  -n host[:port][#company]= Join network game\n"
                "  -p password         = Password to join server\n"
                "  -D [host][:port]    = Start dedicated server\n"
#if !defined(_WIN32)
                "  -f                  = Fork into the background (dedicated only)\n"
#endif
                "  -I graphics_set     = Force the graphics set (see below)\n"
                "  -S sounds_set       = Force the sounds set (see below)\n"
                "  -M music_set        = Force the music set (see below)\n"
                "  -c config_file      = Use 'config_file' instead of 'openttd.cfg'\n"
                "  -x                  = Never save configuration changes to disk\n"
                "  -X                  = Don't use global folders to search for files\n"
                "  -q savegame         = Write some information about the savegame and exit\n"
                "  -Q                  = Don't scan for/load NewGRF files on startup\n"
                "  -QQ                 = Disable NewGRF scanning/loading entirely\n"
                "\n";

        /* List the graphics packs */
        BaseGraphics::GetSetsList(output_iterator);

        /* List the sounds packs */
        BaseSounds::GetSetsList(output_iterator);

        /* List the music packs */
        BaseMusic::GetSetsList(output_iterator);

        /* List the drivers */
        DriverFactoryBase::GetDriversInfo(output_iterator);

        /* List the blitters */
        BlitterFactory::GetBlittersInfo(output_iterator);

        /* List the debug facilities. */
        DumpDebugFacilityNames(output_iterator);

        /* We need to initialize the AI, so it finds the AIs */
        AI::Initialize();
        AI::GetConsoleList(output_iterator, true);
        AI::Uninitialize(true);

        /* We need to initialize the GameScript, so it finds the GSs */
        Game::Initialize();
        Game::GetConsoleList(output_iterator, true);
        Game::Uninitialize(true);

        /* ShowInfo put output to stderr, but version information should go
         * to stdout; this is the only exception */
#if !defined(_WIN32)
        fmt::print("{}\n", str);
#else
        ShowInfoI(str);
#endif
}

static void WriteSavegameInfo(const std::string &name)
{
        extern SaveLoadVersion _sl_version;
        uint32_t last_ottd_rev = 0;
        uint8_t ever_modified = 0;
        bool removed_newgrfs = false;

        _gamelog.Info(&last_ottd_rev, &ever_modified, &removed_newgrfs);

        std::string message;
        message.reserve(1024);
        fmt::format_to(std::back_inserter(message), "Name:         {}\n", name);
        fmt::format_to(std::back_inserter(message), "Savegame ver: {}\n", _sl_version);
        fmt::format_to(std::back_inserter(message), "NewGRF ver:   0x{:08X}\n", last_ottd_rev);
        fmt::format_to(std::back_inserter(message), "Modified:     {}\n", ever_modified);

        if (removed_newgrfs) {
                fmt::format_to(std::back_inserter(message), "NewGRFs have been removed\n");
        }

        message += "NewGRFs:\n";
        if (_load_check_data.HasNewGrfs()) {
                for (GRFConfig *c = _load_check_data.grfconfig; c != nullptr; c = c->next) {
                        fmt::format_to(std::back_inserter(message), "{:08X} {} {}\n", BSWAP32(c->ident.grfid),
                                FormatArrayAsHex(HasBit(c->flags, GCF_COMPATIBLE) ? c->original_md5sum : c->ident.md5sum), c->filename);
                }
        }

        /* ShowInfo put output to stderr, but version information should go
         * to stdout; this is the only exception */
#if !defined(_WIN32)
        fmt::print("{}\n", message);
#else
        ShowInfoI(message);
#endif
}


/**
 * Extract the resolution from the given string and store
 * it in the 'res' parameter.
 * @param res variable to store the resolution in.
 * @param s   the string to decompose.
 */
static void ParseResolution(Dimension *res, const char *s)
{
        const char *t = strchr(s, 'x');
        if (t == nullptr) {
                ShowInfo("Invalid resolution '{}'", s);
                return;
        }

        res->width  = std::max(std::strtoul(s, nullptr, 0), 64UL);
        res->height = std::max(std::strtoul(t + 1, nullptr, 0), 64UL);
}


/**
 * Uninitializes drivers, frees allocated memory, cleans pools, ...
 * Generally, prepares the game for shutting down
 */
static void ShutdownGame()
{
        IConsoleFree();

        if (_network_available) NetworkShutDown(); // Shut down the network and close any open connections

        SocialIntegration::Shutdown();
        DriverFactoryBase::ShutdownDrivers();

        UnInitWindowSystem();

        /* stop the scripts */
        AI::Uninitialize(false);
        Game::Uninitialize(false);

        /* Uninitialize variables that are allocated dynamically */
        _gamelog.Reset();

        LinkGraphSchedule::Clear();
        PoolBase::Clean(PT_ALL);

        /* No NewGRFs were loaded when it was still bootstrapping. */
        if (_game_mode != GM_BOOTSTRAP) ResetNewGRFData();

        UninitFontCache();
}

/**
 * Load the introduction game.
 * @param load_newgrfs Whether to load the NewGRFs or not.
 */
static void LoadIntroGame(bool load_newgrfs = true)
{
        _game_mode = GM_MENU;

        if (load_newgrfs) ResetGRFConfig(false);

        /* Setup main window */
        ResetWindowSystem();
        SetupColoursAndInitialWindow();

        /* Load the default opening screen savegame */
        if (SaveOrLoad("opntitle.dat", SLO_LOAD, DFT_GAME_FILE, BASESET_DIR) != SL_OK) {
                GenerateWorld(GWM_EMPTY, 64, 64); // if failed loading, make empty world.
                SetLocalCompany(COMPANY_SPECTATOR);
        } else {
                SetLocalCompany(COMPANY_FIRST);
        }

        FixTitleGameZoom();
        _pause_mode = PM_UNPAUSED;
        _cursor.fix_at = false;

        CheckForMissingGlyphs();

        MusicLoop(); // ensure music is correct
}

void MakeNewgameSettingsLive()
{
        for (CompanyID c = COMPANY_FIRST; c < MAX_COMPANIES; c++) {
                if (_settings_game.ai_config[c] != nullptr) {
                        delete _settings_game.ai_config[c];
                }
        }
        if (_settings_game.game_config != nullptr) {
                delete _settings_game.game_config;
        }

        /* Copy newgame settings to active settings.
         * Also initialise old settings needed for savegame conversion. */
        _settings_game = _settings_newgame;
        _old_vds = _settings_client.company.vehicle;

        for (CompanyID c = COMPANY_FIRST; c < MAX_COMPANIES; c++) {
                _settings_game.ai_config[c] = nullptr;
                if (_settings_newgame.ai_config[c] != nullptr) {
                        _settings_game.ai_config[c] = new AIConfig(_settings_newgame.ai_config[c]);
                }
        }
        _settings_game.game_config = nullptr;
        if (_settings_newgame.game_config != nullptr) {
                _settings_game.game_config = new GameConfig(_settings_newgame.game_config);
        }
}

void OpenBrowser(const std::string &url)
{
        /* Make sure we only accept urls that are sure to open a browser. */
        if (url.starts_with("http://") || url.starts_with("https://")) {
                OSOpenBrowser(url);
        }
}

/** Callback structure of statements to be executed after the NewGRF scan. */
struct AfterNewGRFScan : NewGRFScanCallback {
        TimerGameCalendar::Year startyear = CalendarTime::INVALID_YEAR; ///< The start year.
        uint32_t generation_seed = GENERATE_NEW_SEED; ///< Seed for the new game.
        std::string dedicated_host;                 ///< Hostname for the dedicated server.
        uint16_t dedicated_port = 0;                  ///< Port for the dedicated server.
        std::string connection_string;              ///< Information about the server to connect to
        std::string join_server_password;           ///< The password to join the server with.
        bool save_config = true;                    ///< The save config setting.

        /**
         * Create a new callback.
         */
        AfterNewGRFScan()
        {
                /* Visual C++ 2015 fails compiling this line (AfterNewGRFScan::generation_seed undefined symbol)
                 * if it's placed outside a member function, directly in the struct body. */
                static_assert(sizeof(generation_seed) == sizeof(_settings_game.game_creation.generation_seed));
        }

        void OnNewGRFsScanned() override
        {
                ResetGRFConfig(false);

                TarScanner::DoScan(TarScanner::SCENARIO);

                AI::Initialize();
                Game::Initialize();

                /* We want the new (correct) NewGRF count to survive the loading. */
                uint last_newgrf_count = _settings_client.gui.last_newgrf_count;
                LoadFromConfig();
                _settings_client.gui.last_newgrf_count = last_newgrf_count;
                /* Since the default for the palette might have changed due to
                 * reading the configuration file, recalculate that now. */
                UpdateNewGRFConfigPalette();

                Game::Uninitialize(true);
                AI::Uninitialize(true);
                LoadFromHighScore();
                LoadHotkeysFromConfig();
                WindowDesc::LoadFromConfig();

                /* We have loaded the config, so we may possibly save it. */
                _save_config = save_config;

                /* restore saved music and effects volumes */
                MusicDriver::GetInstance()->SetVolume(_settings_client.music.music_vol);
                SetEffectVolume(_settings_client.music.effect_vol);

                if (startyear != CalendarTime::INVALID_YEAR) IConsoleSetSetting("game_creation.starting_year", startyear.base());
                _settings_newgame.game_creation.generation_seed = generation_seed;

                if (!dedicated_host.empty()) {
                        _network_bind_list.clear();
                        _network_bind_list.emplace_back(dedicated_host);
                }
                if (dedicated_port != 0) _settings_client.network.server_port = dedicated_port;

                /* initialize the ingame console */
                IConsoleInit();
                InitializeGUI();
                IConsoleCmdExec("exec scripts/autoexec.scr 0");

                /* Make sure _settings is filled with _settings_newgame if we switch to a game directly */
                if (_switch_mode != SM_NONE) MakeNewgameSettingsLive();

                if (_network_available && !connection_string.empty()) {
                        LoadIntroGame();
                        _switch_mode = SM_NONE;

                        NetworkClientConnectGame(connection_string, COMPANY_NEW_COMPANY, join_server_password);
                }

                /* After the scan we're not used anymore. */
                delete this;
        }
};

void PostMainLoop()
{
        WaitTillSaved();

        /* only save config if we have to */
        if (_save_config) {
                SaveToConfig();
                SaveHotkeysToConfig();
                WindowDesc::SaveToConfig();
                SaveToHighScore();
        }

        /* Reset windowing system, stop drivers, free used memory, ... */
        ShutdownGame();
}

#if defined(UNIX)
extern void DedicatedFork();
#endif

/**
 * Create all the options that OpenTTD supports. Each option is
 * always a single character with no, an optional or a required value.
 * @return The available options.
 */
static std::vector<OptionData> CreateOptions()
{
        std::vector<OptionData> options;
        /* Options that require a parameter. */
        for (char c : "GIMSbcmnpqrstv") options.push_back({ .type = ODF_HAS_VALUE, .id = c, .shortname = c });
#if !defined(_WIN32)
        options.push_back({ .type = ODF_HAS_VALUE, .id = 'f', .shortname = 'f' });
#endif

        /* Options with an optional parameter. */
        for (char c : "Ddg") options.push_back({ .type = ODF_OPTIONAL_VALUE, .id = c, .shortname = c });

        /* Options without a parameter. */
        for (char c : "QXehx") options.push_back({ .type = ODF_NO_VALUE, .id = c, .shortname = c });
        return options;
}

/**
 * Main entry point for this lovely game.
 * @param arguments The command line arguments passed to the application.
 * @return 0 when there is no error.
 */
int openttd_main(std::span<char * const> arguments)
{
        _game_session_stats.start_time = std::chrono::steady_clock::now();
        _game_session_stats.savegame_size = std::nullopt;

        std::string musicdriver;
        std::string sounddriver;
        std::string videodriver;
        std::string blitter;
        std::string graphics_set;
        std::string sounds_set;
        std::string music_set;
        Dimension resolution = {0, 0};
        std::unique_ptr<AfterNewGRFScan> scanner = std::make_unique<AfterNewGRFScan>();
        bool dedicated = false;
        bool only_local_path = false;

        extern bool _dedicated_forks;
        _dedicated_forks = false;

        _game_mode = GM_MENU;
        _switch_mode = SM_MENU;

        auto options = CreateOptions();
        GetOptData mgo(arguments.subspan(1), options);
        int ret = 0;

        int i;
        while ((i = mgo.GetOpt()) != -1) {
                switch (i) {
                case 'I': graphics_set = mgo.opt; break;
                case 'S': sounds_set = mgo.opt; break;
                case 'M': music_set = mgo.opt; break;
                case 'm': musicdriver = mgo.opt; break;
                case 's': sounddriver = mgo.opt; break;
                case 'v': videodriver = mgo.opt; break;
                case 'b': blitter = mgo.opt; break;
                case 'D':
                        musicdriver = "null";
                        sounddriver = "null";
                        videodriver = "dedicated";
                        blitter = "null";
                        dedicated = true;
                        SetDebugString("net=4", ShowInfoI);
                        if (mgo.opt != nullptr) {
                                scanner->dedicated_host = ParseFullConnectionString(mgo.opt, scanner->dedicated_port);
                        }
                        break;
                case 'f': _dedicated_forks = true; break;
                case 'n':
                        scanner->connection_string = mgo.opt; // host:port#company parameter
                        break;
                case 'p':
                        scanner->join_server_password = mgo.opt;
                        break;
                case 'r': ParseResolution(&resolution, mgo.opt); break;
                case 't': scanner->startyear = atoi(mgo.opt); break;
                case 'd': {
#if defined(_WIN32)
                                CreateConsole();
#endif
                                if (mgo.opt != nullptr) SetDebugString(mgo.opt, ShowInfoI);
                                break;
                        }
                case 'e':
                        /* Allow for '-e' before or after '-g'. */
                        switch (_switch_mode) {
                                case SM_MENU: _switch_mode = SM_EDITOR; break;
                                case SM_LOAD_GAME: _switch_mode = SM_LOAD_SCENARIO; break;
                                case SM_START_HEIGHTMAP: _switch_mode = SM_LOAD_HEIGHTMAP; break;
                                default: break;
                        }
                        break;
                case 'g':
                        if (mgo.opt != nullptr) {
                                _file_to_saveload.name = mgo.opt;

                                std::string extension = FS2OTTD(std::filesystem::path(OTTD2FS(_file_to_saveload.name)).extension());
                                auto [ft, _] = FiosGetSavegameListCallback(SLO_LOAD, _file_to_saveload.name, extension);
                                if (ft == FIOS_TYPE_INVALID) {
                                        std::tie(ft, _) = FiosGetScenarioListCallback(SLO_LOAD, _file_to_saveload.name, extension);
                                }
                                if (ft == FIOS_TYPE_INVALID) {
                                        std::tie(ft, _) = FiosGetHeightmapListCallback(SLO_LOAD, _file_to_saveload.name, extension);
                                }

                                /* Allow for '-e' before or after '-g'. */
                                switch (GetAbstractFileType(ft)) {
                                        case FT_SAVEGAME: _switch_mode = (_switch_mode == SM_EDITOR ? SM_LOAD_SCENARIO : SM_LOAD_GAME); break;
                                        case FT_SCENARIO: _switch_mode = (_switch_mode == SM_EDITOR ? SM_LOAD_SCENARIO : SM_LOAD_GAME); break;
                                        case FT_HEIGHTMAP: _switch_mode = (_switch_mode == SM_EDITOR ? SM_LOAD_HEIGHTMAP : SM_START_HEIGHTMAP); break;
                                        default: break;
                                }

                                _file_to_saveload.SetMode(SLO_LOAD, GetAbstractFileType(ft), GetDetailedFileType(ft));
                                break;
                        }

                        _switch_mode = SM_NEWGAME;
                        /* Give a random map if no seed has been given */
                        if (scanner->generation_seed == GENERATE_NEW_SEED) {
                                scanner->generation_seed = InteractiveRandom();
                        }
                        break;
                case 'q': {
                        DeterminePaths(arguments[0], only_local_path);
                        if (StrEmpty(mgo.opt)) {
                                ret = 1;
                                return ret;
                        }

                        std::string extension = FS2OTTD(std::filesystem::path(OTTD2FS(mgo.opt)).extension());
                        auto [_, title] = FiosGetSavegameListCallback(SLO_LOAD, mgo.opt, extension);

                        _load_check_data.Clear();
                        SaveOrLoadResult res = SaveOrLoad(mgo.opt, SLO_CHECK, DFT_GAME_FILE, SAVE_DIR, false);
                        if (res != SL_OK || _load_check_data.HasErrors()) {
                                fmt::print(stderr, "Failed to open savegame\n");
                                if (_load_check_data.HasErrors()) {
                                        InitializeLanguagePacks(); // A language pack is needed for GetString()
                                        SetDParamStr(0, _load_check_data.error_msg);
                                        fmt::print(stderr, "{}\n", GetString(_load_check_data.error));
                                }
                                return ret;
                        }

                        WriteSavegameInfo(title);
                        return ret;
                }
                case 'Q': {
                        extern int _skip_all_newgrf_scanning;
                        _skip_all_newgrf_scanning += 1;
                        break;
                }
                case 'G': scanner->generation_seed = std::strtoul(mgo.opt, nullptr, 10); break;
                case 'c': _config_file = mgo.opt; break;
                case 'x': scanner->save_config = false; break;
                case 'X': only_local_path = true; break;
                case 'h':
                        i = -2; // Force printing of help.
                        break;
                }
                if (i == -2) break;
        }

        if (i == -2 || !mgo.arguments.empty()) {
                /* Either the user typed '-h', they made an error, or they added unrecognized command line arguments.
                 * In all cases, print the help, and exit.
                 *
                 * The next two functions are needed to list the graphics sets. We can't do them earlier
                 * because then we cannot show it on the debug console as that hasn't been configured yet. */
                DeterminePaths(arguments[0], only_local_path);
                TarScanner::DoScan(TarScanner::BASESET);
                BaseGraphics::FindSets();
                BaseSounds::FindSets();
                BaseMusic::FindSets();
                ShowHelp();
                return ret;
        }

        DeterminePaths(arguments[0], only_local_path);
        TarScanner::DoScan(TarScanner::BASESET);

        if (dedicated) Debug(net, 3, "Starting dedicated server, version {}", _openttd_revision);
        if (_dedicated_forks && !dedicated) _dedicated_forks = false;

#if defined(UNIX)
        /* We must fork here, or we'll end up without some resources we need (like sockets) */
        if (_dedicated_forks) DedicatedFork();
#endif

        LoadFromConfig(true);

        if (resolution.width != 0) _cur_resolution = resolution;

        /* Limit width times height times bytes per pixel to fit a 32 bit
         * integer, This way all internal drawing routines work correctly.
         * A resolution that has one component as 0 is treated as a marker to
         * auto-detect a good window size. */
        _cur_resolution.width  = std::min(_cur_resolution.width, UINT16_MAX / 2u);
        _cur_resolution.height = std::min(_cur_resolution.height, UINT16_MAX / 2u);

        /* Assume the cursor starts within the game as not all video drivers
         * get an event that the cursor is within the window when it is opened.
         * Saying the cursor is there makes no visible difference as it would
         * just be out of the bounds of the window. */
        _cursor.in_window = true;

        /* enumerate language files */
        InitializeLanguagePacks();

        /* Initialize the font cache */
        InitFontCache(false);

        /* This must be done early, since functions use the SetWindowDirty* calls */
        InitWindowSystem();

        BaseGraphics::FindSets();
        bool valid_graphics_set;
        if (!graphics_set.empty()) {
                valid_graphics_set = BaseGraphics::SetSetByName(graphics_set);
        } else if (BaseGraphics::ini_data.shortname != 0) {
                graphics_set = BaseGraphics::ini_data.name;
                valid_graphics_set = BaseGraphics::SetSetByShortname(BaseGraphics::ini_data.shortname);
                if (valid_graphics_set && !BaseGraphics::ini_data.extra_params.empty()) {
                        GRFConfig &extra_cfg = BaseGraphics::GetUsedSet()->GetOrCreateExtraConfig();
                        if (extra_cfg.IsCompatible(BaseGraphics::ini_data.extra_version)) {
                                extra_cfg.SetParams(BaseGraphics::ini_data.extra_params);
                        }
                }
        } else if (!BaseGraphics::ini_data.name.empty()) {
                graphics_set = BaseGraphics::ini_data.name;
                valid_graphics_set = BaseGraphics::SetSetByName(BaseGraphics::ini_data.name);
        } else {
                valid_graphics_set = true;
                BaseGraphics::SetSet(nullptr); // ignore error, continue to bootstrap GUI
        }
        if (!valid_graphics_set) {
                BaseGraphics::SetSet(nullptr);

                ErrorMessageData msg(STR_CONFIG_ERROR, STR_CONFIG_ERROR_INVALID_BASE_GRAPHICS_NOT_FOUND);
                msg.SetDParamStr(0, graphics_set);
                ScheduleErrorMessage(msg);
        }

        /* Initialize game palette */
        GfxInitPalettes();

        Debug(misc, 1, "Loading blitter...");
        if (blitter.empty() && !_ini_blitter.empty()) blitter = _ini_blitter;
        _blitter_autodetected = blitter.empty();
        /* Activate the initial blitter.
         * This is only some initial guess, after NewGRFs have been loaded SwitchNewGRFBlitter may switch to a different one.
         *  - Never guess anything, if the user specified a blitter. (_blitter_autodetected)
         *  - Use 32bpp blitter if baseset or 8bpp-support settings says so.
         *  - Use 8bpp blitter otherwise.
         */
        if (!_blitter_autodetected ||
                        (_support8bpp != S8BPP_NONE && (BaseGraphics::GetUsedSet() == nullptr || BaseGraphics::GetUsedSet()->blitter == BLT_8BPP)) ||
                        BlitterFactory::SelectBlitter("32bpp-anim") == nullptr) {
                if (BlitterFactory::SelectBlitter(blitter) == nullptr) {
                        blitter.empty() ?
                                UserError("Failed to autoprobe blitter") :
                                UserError("Failed to select requested blitter '{}'; does it exist?", blitter);
                }
        }

        if (videodriver.empty() && !_ini_videodriver.empty()) videodriver = _ini_videodriver;
        DriverFactoryBase::SelectDriver(videodriver, Driver::DT_VIDEO);

        InitializeSpriteSorter();

        /* Initialize the zoom level of the screen to normal */
        _screen.zoom = ZOOM_LVL_MIN;

        /* The video driver is now selected, now initialise GUI zoom */
        UpdateGUIZoom();

        SocialIntegration::Initialize();
        NetworkStartUp(); // initialize network-core

        if (!HandleBootstrap()) {
                ShutdownGame();
                return ret;
        }

        VideoDriver::GetInstance()->ClaimMousePointer();

        /* initialize screenshot formats */
        InitializeScreenshotFormats();

        BaseSounds::FindSets();
        if (sounds_set.empty() && !BaseSounds::ini_set.empty()) sounds_set = BaseSounds::ini_set;
        if (!BaseSounds::SetSetByName(sounds_set)) {
                if (sounds_set.empty() || !BaseSounds::SetSet({})) {
                        UserError("Failed to find a sounds set. Please acquire a sounds set for OpenTTD. See section 1.4 of README.md.");
                } else {
                        ErrorMessageData msg(STR_CONFIG_ERROR, STR_CONFIG_ERROR_INVALID_BASE_SOUNDS_NOT_FOUND);
                        msg.SetDParamStr(0, sounds_set);
                        ScheduleErrorMessage(msg);
                }
        }

        BaseMusic::FindSets();
        if (music_set.empty() && !BaseMusic::ini_set.empty()) music_set = BaseMusic::ini_set;
        if (!BaseMusic::SetSetByName(music_set)) {
                if (music_set.empty() || !BaseMusic::SetSet({})) {
                        UserError("Failed to find a music set. Please acquire a music set for OpenTTD. See section 1.4 of README.md.");
                } else {
                        ErrorMessageData msg(STR_CONFIG_ERROR, STR_CONFIG_ERROR_INVALID_BASE_MUSIC_NOT_FOUND);
                        msg.SetDParamStr(0, music_set);
                        ScheduleErrorMessage(msg);
                }
        }

        if (sounddriver.empty() && !_ini_sounddriver.empty()) sounddriver = _ini_sounddriver;
        DriverFactoryBase::SelectDriver(sounddriver, Driver::DT_SOUND);

        if (musicdriver.empty() && !_ini_musicdriver.empty()) musicdriver = _ini_musicdriver;
        DriverFactoryBase::SelectDriver(musicdriver, Driver::DT_MUSIC);

        GenerateWorld(GWM_EMPTY, 64, 64); // Make the viewport initialization happy
        LoadIntroGame(false);

        /* ScanNewGRFFiles now has control over the scanner. */
        RequestNewGRFScan(scanner.release());

        VideoDriver::GetInstance()->MainLoop();

        PostMainLoop();
        return ret;
}

void HandleExitGameRequest()
{
        if (_game_mode == GM_MENU || _game_mode == GM_BOOTSTRAP) { // do not ask to quit on the main screen
                _exit_game = true;
        } else if (_settings_client.gui.autosave_on_exit) {
                DoExitSave();
                _survey.Transmit(NetworkSurveyHandler::Reason::EXIT, true);
                _exit_game = true;
        } else {
                AskExitGame();
        }
}

/**
 * Triggers everything required to set up a saved scenario for a new game.
 */
static void OnStartScenario()
{
        /* Reset engine pool to simplify changing engine NewGRFs in scenario editor. */
        EngineOverrideManager::ResetToCurrentNewGRFConfig();

        /* Make sure all industries were built "this year", to avoid too early closures. (#9918) */
        for (Industry *i : Industry::Iterate()) {
                i->last_prod_year = TimerGameEconomy::year;
        }
}

/**
 * Triggers everything that should be triggered when starting a game.
 * @param dedicated_server Whether this is a dedicated server or not.
 */
static void OnStartGame(bool dedicated_server)
{
        /* Update the local company for a loaded game. It is either the first available company
         * or in the case of a dedicated server, a spectator */
        SetLocalCompany(dedicated_server ? COMPANY_SPECTATOR : GetFirstPlayableCompanyID());

        NetworkOnGameStart();

        /* Execute the game-start script */
        IConsoleCmdExec("exec scripts/game_start.scr 0");
}

static void MakeNewGameDone()
{
        SettingsDisableElrail(_settings_game.vehicle.disable_elrails);

        /* In a dedicated server, the server does not play */
        if (!VideoDriver::GetInstance()->HasGUI()) {
                OnStartGame(true);
                if (_settings_client.gui.pause_on_newgame) Command<CMD_PAUSE>::Post(PM_PAUSED_NORMAL, true);
                return;
        }

        /* Create a single company */
        DoStartupNewCompany(false);

        Company *c = Company::Get(COMPANY_FIRST);
        c->settings = _settings_client.company;

        /* Overwrite color from settings if needed
         * COLOUR_END corresponds to Random colour */

        if (_settings_client.gui.starting_colour != COLOUR_END) {
                c->colour = _settings_client.gui.starting_colour;
                ResetCompanyLivery(c);
                _company_colours[c->index] = c->colour;
        }

        if (_settings_client.gui.starting_colour_secondary != COLOUR_END && HasBit(_loaded_newgrf_features.used_liveries, LS_DEFAULT)) {
                Command<CMD_SET_COMPANY_COLOUR>::Post(LS_DEFAULT, false, _settings_client.gui.starting_colour_secondary);
        }

        OnStartGame(false);

        InitializeRailGUI();
        InitializeRoadGUI();

        if (_settings_client.gui.pause_on_newgame) Command<CMD_PAUSE>::Post(PM_PAUSED_NORMAL, true);

        CheckEngines();
        CheckIndustries();
        MarkWholeScreenDirty();
}

static void MakeNewGame(bool from_heightmap, bool reset_settings)
{
        _game_mode = GM_NORMAL;
        if (!from_heightmap) {
                /* "reload" command needs to know what mode we were in. */
                _file_to_saveload.SetMode(SLO_INVALID, FT_INVALID, DFT_INVALID);
        }

        ResetGRFConfig(true);

        GenerateWorldSetCallback(&MakeNewGameDone);
        GenerateWorld(from_heightmap ? GWM_HEIGHTMAP : GWM_NEWGAME, 1 << _settings_game.game_creation.map_x, 1 << _settings_game.game_creation.map_y, reset_settings);
}

static void MakeNewEditorWorldDone()
{
        SetLocalCompany(OWNER_NONE);
}

static void MakeNewEditorWorld()
{
        _game_mode = GM_EDITOR;
        /* "reload" command needs to know what mode we were in. */
        _file_to_saveload.SetMode(SLO_INVALID, FT_INVALID, DFT_INVALID);

        ResetGRFConfig(true);

        GenerateWorldSetCallback(&MakeNewEditorWorldDone);
        GenerateWorld(GWM_EMPTY, 1 << _settings_game.game_creation.map_x, 1 << _settings_game.game_creation.map_y);
}

/**
 * Load the specified savegame but on error do different things.
 * If loading fails due to corrupt savegame, bad version, etc. go back to
 * a previous correct state. In the menu for example load the intro game again.
 * @param filename file to be loaded
 * @param fop mode of loading, always SLO_LOAD
 * @param newgm switch to this mode of loading fails due to some unknown error
 * @param subdir default directory to look for filename, set to 0 if not needed
 * @param lf Load filter to use, if nullptr: use filename + subdir.
 */
bool SafeLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, GameMode newgm, Subdirectory subdir, std::shared_ptr<LoadFilter> lf = nullptr)
{
        assert(fop == SLO_LOAD);
        assert(dft == DFT_GAME_FILE || (lf == nullptr && dft == DFT_OLD_GAME_FILE));
        GameMode ogm = _game_mode;

        _game_mode = newgm;

        SaveOrLoadResult result = (lf == nullptr) ? SaveOrLoad(filename, fop, dft, subdir) : LoadWithFilter(lf);
        if (result == SL_OK) return true;

        if (_network_dedicated && ogm == GM_MENU) {
                /*
                 * If we are a dedicated server *and* we just were in the menu, then we
                 * are loading the first savegame. If that fails, not starting the
                 * server is a better reaction than starting the server with a newly
                 * generated map as it is quite likely to be started from a script.
                 */
                Debug(net, 0, "Loading requested map failed; closing server.");
                _exit_game = true;
                return false;
        }

        if (result != SL_REINIT) {
                _game_mode = ogm;
                return false;
        }

        if (_network_dedicated) {
                /*
                 * If we are a dedicated server, have already loaded/started a game,
                 * and then loading the savegame fails in a manner that we need to
                 * reinitialize everything. We must not fall back into the menu mode
                 * with the intro game, as that is unjoinable by clients. So there is
                 * nothing else to do than start a new game, as it might have failed
                 * trying to reload the originally loaded savegame/scenario.
                 */
                Debug(net, 0, "Loading game failed, so a new (random) game will be started");
                MakeNewGame(false, true);
                return false;
        }

        if (_network_server) {
                /* We can't load the intro game as server, so disconnect first. */
                NetworkDisconnect();
        }

        switch (ogm) {
                default:
                case GM_MENU:   LoadIntroGame();      break;
                case GM_EDITOR: MakeNewEditorWorld(); break;
        }
        return false;
}

static void UpdateSocialIntegration(GameMode game_mode)
{
        switch (game_mode) {
                case GM_BOOTSTRAP:
                case GM_MENU:
                        SocialIntegration::EventEnterMainMenu();
                        break;

                case GM_NORMAL:
                        if (_networking) {
                                SocialIntegration::EventEnterMultiplayer(Map::SizeX(), Map::SizeY());
                        } else {
                                SocialIntegration::EventEnterSingleplayer(Map::SizeX(), Map::SizeY());
                        }
                        break;

                case GM_EDITOR:
                        SocialIntegration::EventEnterScenarioEditor(Map::SizeX(), Map::SizeY());
                        break;
        }
}

void SwitchToMode(SwitchMode new_mode)
{
        /* If we are saving something, the network stays in its current state */
        if (new_mode != SM_SAVE_GAME) {
                /* If the network is active, make it not-active */
                if (_networking) {
                        if (_network_server && (new_mode == SM_LOAD_GAME || new_mode == SM_NEWGAME || new_mode == SM_RESTARTGAME)) {
                                NetworkReboot();
                        } else {
                                NetworkDisconnect();
                        }
                }

                /* If we are a server, we restart the server */
                if (_is_network_server) {
                        /* But not if we are going to the menu */
                        if (new_mode != SM_MENU) {
                                /* check if we should reload the config */
                                if (_settings_client.network.reload_cfg) {
                                        LoadFromConfig();
                                        MakeNewgameSettingsLive();
                                        ResetGRFConfig(false);
                                }
                                NetworkServerStart();
                        } else {
                                /* This client no longer wants to be a network-server */
                                _is_network_server = false;
                        }
                }
        }

        /* Make sure all AI controllers are gone at quitting game */
        if (new_mode != SM_SAVE_GAME) AI::KillAll();

        /* When we change mode, reset the autosave. */
        if (new_mode != SM_SAVE_GAME) ChangeAutosaveFrequency(true);

        /* Transmit the survey if we were in normal-mode and not saving. It always means we leaving the current game. */
        if (_game_mode == GM_NORMAL && new_mode != SM_SAVE_GAME) _survey.Transmit(NetworkSurveyHandler::Reason::LEAVE);

        /* Keep track when we last switch mode. Used for survey, to know how long someone was in a game. */
        if (new_mode != SM_SAVE_GAME) {
                _game_session_stats.start_time = std::chrono::steady_clock::now();
                _game_session_stats.savegame_size = std::nullopt;
        }

        switch (new_mode) {
                case SM_EDITOR: // Switch to scenario editor
                        MakeNewEditorWorld();
                        GenerateSavegameId();

                        UpdateSocialIntegration(GM_EDITOR);
                        break;

                case SM_RELOADGAME: // Reload with what-ever started the game
                        if (_file_to_saveload.abstract_ftype == FT_SAVEGAME || _file_to_saveload.abstract_ftype == FT_SCENARIO) {
                                /* Reload current savegame/scenario */
                                _switch_mode = _game_mode == GM_EDITOR ? SM_LOAD_SCENARIO : SM_LOAD_GAME;
                                SwitchToMode(_switch_mode);
                                break;
                        } else if (_file_to_saveload.abstract_ftype == FT_HEIGHTMAP) {
                                /* Restart current heightmap */
                                _switch_mode = _game_mode == GM_EDITOR ? SM_LOAD_HEIGHTMAP : SM_RESTART_HEIGHTMAP;
                                SwitchToMode(_switch_mode);
                                break;
                        }

                        MakeNewGame(false, new_mode == SM_NEWGAME);
                        GenerateSavegameId();

                        UpdateSocialIntegration(GM_NORMAL);
                        break;

                case SM_RESTARTGAME: // Restart --> 'Random game' with current settings
                case SM_NEWGAME: // New Game --> 'Random game'
                        MakeNewGame(false, new_mode == SM_NEWGAME);
                        GenerateSavegameId();

                        UpdateSocialIntegration(GM_NORMAL);
                        break;

                case SM_LOAD_GAME: { // Load game, Play Scenario
                        ResetGRFConfig(true);
                        ResetWindowSystem();

                        if (!SafeLoad(_file_to_saveload.name, _file_to_saveload.file_op, _file_to_saveload.detail_ftype, GM_NORMAL, NO_DIRECTORY)) {
                                ShowErrorMessage(GetSaveLoadErrorType(), GetSaveLoadErrorMessage(), WL_CRITICAL);
                        } else {
                                if (_file_to_saveload.abstract_ftype == FT_SCENARIO) {
                                        OnStartScenario();
                                }
                                OnStartGame(_network_dedicated);
                                /* Decrease pause counter (was increased from opening load dialog) */
                                Command<CMD_PAUSE>::Post(PM_PAUSED_SAVELOAD, false);
                        }

                        UpdateSocialIntegration(GM_NORMAL);
                        break;
                }

                case SM_RESTART_HEIGHTMAP: // Load a heightmap and start a new game from it with current settings
                case SM_START_HEIGHTMAP: // Load a heightmap and start a new game from it
                        MakeNewGame(true, new_mode == SM_START_HEIGHTMAP);
                        GenerateSavegameId();

                        UpdateSocialIntegration(GM_NORMAL);
                        break;

                case SM_LOAD_HEIGHTMAP: // Load heightmap from scenario editor
                        SetLocalCompany(OWNER_NONE);

                        _game_mode = GM_EDITOR;

                        GenerateWorld(GWM_HEIGHTMAP, 1 << _settings_game.game_creation.map_x, 1 << _settings_game.game_creation.map_y);
                        GenerateSavegameId();
                        MarkWholeScreenDirty();

                        UpdateSocialIntegration(GM_EDITOR);
                        break;

                case SM_LOAD_SCENARIO: { // Load scenario from scenario editor
                        if (SafeLoad(_file_to_saveload.name, _file_to_saveload.file_op, _file_to_saveload.detail_ftype, GM_EDITOR, NO_DIRECTORY)) {
                                SetLocalCompany(OWNER_NONE);
                                GenerateSavegameId();
                                _settings_newgame.game_creation.starting_year = TimerGameCalendar::year;
                                /* Cancel the saveload pausing */
                                Command<CMD_PAUSE>::Post(PM_PAUSED_SAVELOAD, false);
                        } else {
                                ShowErrorMessage(GetSaveLoadErrorType(), GetSaveLoadErrorMessage(), WL_CRITICAL);
                        }

                        UpdateSocialIntegration(GM_EDITOR);
                        break;
                }

                case SM_JOIN_GAME: // Join a multiplayer game
                        LoadIntroGame();
                        NetworkClientJoinGame();

                        SocialIntegration::EventJoiningMultiplayer();
                        break;

                case SM_MENU: // Switch to game intro menu
                        LoadIntroGame();
                        if (BaseSounds::ini_set.empty() && BaseSounds::GetUsedSet()->fallback && SoundDriver::GetInstance()->HasOutput()) {
                                ShowErrorMessage(STR_WARNING_FALLBACK_SOUNDSET, INVALID_STRING_ID, WL_CRITICAL);
                                BaseSounds::ini_set = BaseSounds::GetUsedSet()->name;
                        }
                        if (_settings_client.network.participate_survey == PS_ASK) {
                                /* No matter how often you go back to the main menu, only ask the first time. */
                                static bool asked_once = false;
                                if (!asked_once) {
                                        asked_once = true;
                                        ShowNetworkAskSurvey();
                                }
                        }

                        UpdateSocialIntegration(GM_MENU);
                        break;

                case SM_SAVE_GAME: // Save game.
                        /* Make network saved games on pause compatible to singleplayer mode */
                        if (SaveOrLoad(_file_to_saveload.name, SLO_SAVE, DFT_GAME_FILE, NO_DIRECTORY) != SL_OK) {
                                ShowErrorMessage(GetSaveLoadErrorType(), GetSaveLoadErrorMessage(), WL_ERROR);
                        } else {
                                CloseWindowById(WC_SAVELOAD, 0);
                        }
                        break;

                case SM_SAVE_HEIGHTMAP: // Save heightmap.
                        MakeHeightmapScreenshot(_file_to_saveload.name.c_str());
                        CloseWindowById(WC_SAVELOAD, 0);
                        break;

                case SM_GENRANDLAND: // Generate random land within scenario editor
                        SetLocalCompany(OWNER_NONE);
                        GenerateWorld(GWM_RANDOM, 1 << _settings_game.game_creation.map_x, 1 << _settings_game.game_creation.map_y);
                        /* XXX: set date */
                        MarkWholeScreenDirty();
                        break;

                default: NOT_REACHED();
        }
}



/**
 * State controlling game loop.
 * The state must not be changed from anywhere but here.
 * That check is enforced in DoCommand.
 */
void StateGameLoop()
{
        if (!_networking || _network_server) {
                StateGameLoop_LinkGraphPauseControl();
        }

        /* Don't execute the state loop during pause or when modal windows are open. */
        if (_pause_mode != PM_UNPAUSED || HasModalProgress()) {
                PerformanceMeasurer::Paused(PFE_GAMELOOP);
                PerformanceMeasurer::Paused(PFE_GL_ECONOMY);
                PerformanceMeasurer::Paused(PFE_GL_TRAINS);
                PerformanceMeasurer::Paused(PFE_GL_ROADVEHS);
                PerformanceMeasurer::Paused(PFE_GL_SHIPS);
                PerformanceMeasurer::Paused(PFE_GL_AIRCRAFT);
                PerformanceMeasurer::Paused(PFE_GL_LANDSCAPE);

                if (!HasModalProgress()) UpdateLandscapingLimits();
#ifndef DEBUG_DUMP_COMMANDS
                Game::GameLoop();
#endif
                return;
        }

        PerformanceMeasurer framerate(PFE_GAMELOOP);
        PerformanceAccumulator::Reset(PFE_GL_LANDSCAPE);

        Layouter::ReduceLineCache();

        if (_game_mode == GM_EDITOR) {
                BasePersistentStorageArray::SwitchMode(PSM_ENTER_GAMELOOP);
                RunTileLoop();
                CallVehicleTicks();
                CallLandscapeTick();
                BasePersistentStorageArray::SwitchMode(PSM_LEAVE_GAMELOOP);
                UpdateLandscapingLimits();

                CallWindowGameTickEvent();
                NewsLoop();
        } else {
                if (_debug_desync_level > 2 && TimerGameEconomy::date_fract == 0 && (TimerGameEconomy::date.base() & 0x1F) == 0) {
                        /* Save the desync savegame if needed. */
                        std::string name = fmt::format("dmp_cmds_{:08x}_{:08x}.sav", _settings_game.game_creation.generation_seed, TimerGameEconomy::date);
                        SaveOrLoad(name, SLO_SAVE, DFT_GAME_FILE, AUTOSAVE_DIR, false);
                }

                CheckCaches();

                /* All these actions has to be done from OWNER_NONE
                 *  for multiplayer compatibility */
                Backup<CompanyID> cur_company(_current_company, OWNER_NONE);

                BasePersistentStorageArray::SwitchMode(PSM_ENTER_GAMELOOP);
                AnimateAnimatedTiles();
                if (TimerManager<TimerGameCalendar>::Elapsed(1)) {
                        RunVehicleCalendarDayProc();
                }
                TimerManager<TimerGameEconomy>::Elapsed(1);
                TimerManager<TimerGameTick>::Elapsed(1);
                RunTileLoop();
                CallVehicleTicks();
                CallLandscapeTick();
                BasePersistentStorageArray::SwitchMode(PSM_LEAVE_GAMELOOP);

#ifndef DEBUG_DUMP_COMMANDS
                {
                        PerformanceMeasurer script_framerate(PFE_ALLSCRIPTS);
                        AI::GameLoop();
                        Game::GameLoop();
                }
#endif
                UpdateLandscapingLimits();

                CallWindowGameTickEvent();
                NewsLoop();
                cur_company.Restore();
        }

        assert(IsLocalCompany());
}

/** Interval for regular autosaves. Initialized at zero to disable till settings are loaded. */
static IntervalTimer<TimerGameRealtime> _autosave_interval({std::chrono::milliseconds::zero(), TimerGameRealtime::AUTOSAVE}, [](auto)
{
        /* We reset the command-during-pause mode here, so we don't continue
         * to make auto-saves when nothing more is changing. */
        _pause_mode &= ~PM_COMMAND_DURING_PAUSE;

        _do_autosave = true;
        SetWindowDirty(WC_STATUS_BAR, 0);

        static FiosNumberedSaveName _autosave_ctr("autosave");
        DoAutoOrNetsave(_autosave_ctr);

        _do_autosave = false;
        SetWindowDirty(WC_STATUS_BAR, 0);
});

/**
 * Reset the interval of the autosave.
 *
 * If reset is not set, this does not set the elapsed time on the timer,
 * so if the interval is smaller, it might result in an autosave being done
 * immediately.
 *
 * @param reset Whether to reset the timer back to zero, or to continue.
 */
void ChangeAutosaveFrequency(bool reset)
{
        _autosave_interval.SetInterval({std::chrono::minutes(_settings_client.gui.autosave_interval), TimerGameRealtime::AUTOSAVE}, reset);
}

/**
 * Request a new NewGRF scan. This will be executed on the next game-tick.
 * This is mostly needed to ensure NewGRF scans (which are blocking) are
 * done in the game-thread, and not in the draw-thread (which most often
 * triggers this request).
 * @param callback Optional callback to call when NewGRF scan is completed.
 * @return True when the NewGRF scan was actually requested, false when the scan was already running.
 */
bool RequestNewGRFScan(NewGRFScanCallback *callback)
{
        if (_request_newgrf_scan) return false;

        _request_newgrf_scan = true;
        _request_newgrf_scan_callback = callback;
        return true;
}

void GameLoop()
{
        if (_game_mode == GM_BOOTSTRAP) {
                /* Check for UDP stuff */
                if (_network_available) NetworkBackgroundLoop();
                return;
        }

        if (_request_newgrf_scan) {
                ScanNewGRFFiles(_request_newgrf_scan_callback);
                _request_newgrf_scan = false;
                _request_newgrf_scan_callback = nullptr;
                /* In case someone closed the game during our scan, don't do anything else. */
                if (_exit_game) return;
        }

        ProcessAsyncSaveFinish();

        if (_game_mode == GM_NORMAL) {
                static auto last_time = std::chrono::steady_clock::now();
                auto now = std::chrono::steady_clock::now();
                auto delta_ms = std::chrono::duration_cast<std::chrono::milliseconds>(now - last_time);
                if (delta_ms.count() != 0) {
                        TimerManager<TimerGameRealtime>::Elapsed(delta_ms);
                        last_time = now;
                }
        }

        /* switch game mode? */
        if (_switch_mode != SM_NONE && !HasModalProgress()) {
                SwitchToMode(_switch_mode);
                _switch_mode = SM_NONE;
                if (_exit_game) return;
        }

        IncreaseSpriteLRU();

        /* Check for UDP stuff */
        if (_network_available) NetworkBackgroundLoop();

        DebugSendRemoteMessages();

        if (_networking && !HasModalProgress()) {
                /* Multiplayer */
                NetworkGameLoop();
        } else {
                if (_network_reconnect > 0 && --_network_reconnect == 0) {
                        /* This means that we want to reconnect to the last host
                         * We do this here, because it means that the network is really closed */
                        NetworkClientConnectGame(_settings_client.network.last_joined, COMPANY_SPECTATOR);
                }
                /* Singleplayer */
                StateGameLoop();
        }

        if (!_pause_mode && HasBit(_display_opt, DO_FULL_ANIMATION)) DoPaletteAnimations();

        SoundDriver::GetInstance()->MainLoop();
        MusicLoop();
        SocialIntegration::RunCallbacks();
}