(svn r2397) - CodeChange: rename all "ttd" files to "openttd" files.

1 files changed, 1415 insertions, 0 deletions

diff --git a/openttd.c b/openttd.c
new file mode 100644
index 000000000..619c964f8
--- /dev/null
+++ b/openttd.c
@@ -0,0 +1,1415 @@
+#include "stdafx.h"
+#include "string.h"
+#include "table/strings.h"
+#include "debug.h"
+#include "strings.h"
+#include "map.h"
+#include "tile.h"
+
+#define VARDEF
+#include "openttd.h"
+#include "mixer.h"
+#include "spritecache.h"
+#include "gfx.h"
+#include "gui.h"
+#include "station.h"
+#include "vehicle.h"
+#include "viewport.h"
+#include "window.h"
+#include "player.h"
+#include "command.h"
+#include "town.h"
+#include "industry.h"
+#include "news.h"
+#include "engine.h"
+#include "sound.h"
+#include "economy.h"
+#include "fileio.h"
+#include "hal.h"
+#include "airport.h"
+#include "ai.h"
+#include "console.h"
+#include "screenshot.h"
+#include "network.h"
+#include "signs.h"
+#include "depot.h"
+#include "waypoint.h"
+
+#include <stdarg.h>
+
+void GenerateWorld(int mode, uint log_x, uint log_y);
+void CallLandscapeTick(void);
+void IncreaseDate(void);
+void RunOtherPlayersLoop(void);
+void DoPaletteAnimations(void);
+void MusicLoop(void);
+void ResetMusic(void);
+void InitializeStations(void);
+void DeleteAllPlayerStations(void);
+
+extern void SetDifficultyLevel(int mode, GameOptions *gm_opt);
+extern void DoStartupNewPlayer(bool is_ai);
+extern void ShowOSErrorBox(const char *buf);
+
+bool LoadSavegame(const char *filename);
+
+extern void HalGameLoop(void);
+
+uint32 _pixels_redrawn;
+bool _dbg_screen_rect;
+bool disable_computer; // We should get ride of this thing.. is only used for a debug-cheat
+static byte _os_version = 0;
+
+/* TODO: usrerror() for errors which are not of an internal nature but
+ * caused by the user, i.e. missing files or fatal configuration errors.
+ * Post-0.4.0 since Celestar doesn't want this in SVN before. --pasky */
+
+void CDECL error(const char *s, ...) {
+	va_list va;
+	char buf[512];
+	va_start(va, s);
+	vsprintf(buf, s, va);
+	va_end(va);
+
+	ShowOSErrorBox(buf);
+	if (_video_driver)
+		_video_driver->stop();
+
+	assert(0);
+	exit(1);
+}
+
+void CDECL ShowInfoF(const char *str, ...)
+{
+	va_list va;
+	char buf[1024];
+	va_start(va, str);
+	vsprintf(buf, str, va);
+	va_end(va);
+	ShowInfo(buf);
+}
+
+char * CDECL str_fmt(const char *str, ...)
+{
+	char buf[4096];
+	va_list va;
+	int len;
+	char *p;
+
+	va_start(va, str);
+	len = vsprintf(buf, str, va);
+	va_end(va);
+	p = malloc(len + 1);
+	if (p)
+		memcpy(p, buf, len + 1);
+	return p;
+}
+
+
+// NULL midi driver
+static const char *NullMidiStart(const char * const *parm) { return NULL; }
+static void NullMidiStop(void) {}
+static void NullMidiPlaySong(const char *filename) {}
+static void NullMidiStopSong(void) {}
+static bool NullMidiIsSongPlaying(void) { return true; }
+static void NullMidiSetVolume(byte vol) {}
+
+const HalMusicDriver _null_music_driver = {
+	NullMidiStart,
+	NullMidiStop,
+	NullMidiPlaySong,
+	NullMidiStopSong,
+	NullMidiIsSongPlaying,
+	NullMidiSetVolume,
+};
+
+// NULL video driver
+static void *_null_video_mem;
+static const char *NullVideoStart(const char * const *parm)
+{
+	_screen.width = _screen.pitch = _cur_resolution[0];
+	_screen.height = _cur_resolution[1];
+	_null_video_mem = malloc(_cur_resolution[0]*_cur_resolution[1]);
+	return NULL;
+}
+static void NullVideoStop(void) { free(_null_video_mem); }
+static void NullVideoMakeDirty(int left, int top, int width, int height) {}
+static int NullVideoMainLoop(void)
+{
+	int i = 1000;
+	do {
+		GameLoop();
+		_screen.dst_ptr = _null_video_mem;
+		UpdateWindows();
+	}	while (--i);
+	return ML_QUIT;
+}
+
+static bool NullVideoChangeRes(int w, int h) { return false; }
+static void NullVideoFullScreen(bool fs) {}
+
+const HalVideoDriver _null_video_driver = {
+	NullVideoStart,
+	NullVideoStop,
+	NullVideoMakeDirty,
+	NullVideoMainLoop,
+	NullVideoChangeRes,
+	NullVideoFullScreen,
+};
+
+// NULL sound driver
+static const char *NullSoundStart(const char * const *parm) { return NULL; }
+static void NullSoundStop(void) {}
+const HalSoundDriver _null_sound_driver = {
+	NullSoundStart,
+	NullSoundStop,
+};
+
+enum {
+	DF_PRIORITY_MASK = 0xf,
+};
+
+typedef struct {
+	const DriverDesc *descs;
+	const char *name;
+	void *var;
+} DriverClass;
+
+static DriverClass _driver_classes[] = {
+	{_video_driver_descs, "video", &_video_driver},
+	{_sound_driver_descs, "sound", &_sound_driver},
+	{_music_driver_descs, "music", &_music_driver},
+};
+
+static const DriverDesc *GetDriverByName(const DriverDesc *dd, const char *name)
+{
+	do {
+		if (!strcmp(dd->name, name))
+			return dd;
+	} while ((++dd)->name);
+	return NULL;
+}
+
+static const DriverDesc *ChooseDefaultDriver(const DriverDesc *dd)
+{
+	const DriverDesc *best = NULL;
+	int best_pri = -1;
+	do {
+		if ((int)(dd->flags&DF_PRIORITY_MASK) > best_pri && _os_version >= (byte)dd->flags) {
+			best_pri = dd->flags&DF_PRIORITY_MASK;
+			best = dd;
+		}
+	} while ((++dd)->name);
+	return best;
+}
+
+
+void *ReadFileToMem(const char *filename, size_t *lenp, size_t maxsize)
+{
+	FILE *in;
+	byte *mem;
+	size_t len;
+
+	in = fopen(filename, "rb");
+	if (in == NULL)
+		return NULL;
+
+	fseek(in, 0, SEEK_END);
+	len = ftell(in);
+	fseek(in, 0, SEEK_SET);
+	if (len > maxsize || (mem = malloc(len + 1)) == NULL) {
+		fclose(in);
+		return NULL;
+	}
+	mem[len] = 0;
+	if (fread(mem, len, 1, in) != 1) {
+		fclose(in);
+		free(mem);
+		return NULL;
+	}
+	fclose(in);
+
+	*lenp = len;
+	return mem;
+}
+
+void LoadDriver(int driver, const char *name)
+{
+	const DriverClass *dc = &_driver_classes[driver];
+	const DriverDesc *dd;
+	const void **var;
+	const void *drv;
+	const char *err;
+	char *parm;
+	char buffer[256];
+	const char *parms[32];
+
+	parms[0] = NULL;
+
+	if (!*name) {
+		dd = ChooseDefaultDriver(dc->descs);
+	} else {
+		// Extract the driver name and put parameter list in parm
+		ttd_strlcpy(buffer, name, sizeof(buffer));
+		parm = strchr(buffer, ':');
+		if (parm) {
+			uint np = 0;
+			// Tokenize the parm.
+			do {
+				*parm++ = 0;
+				if (np < lengthof(parms) - 1)
+					parms[np++] = parm;
+				while (*parm != 0 && *parm != ',')
+					parm++;
+			} while (*parm == ',');
+			parms[np] = NULL;
+		}
+		dd = GetDriverByName(dc->descs, buffer);
+		if (dd == NULL)
+			error("No such %s driver: %s\n", dc->name, buffer);
+	}
+	var = dc->var;
+	if (*var != NULL) ((const HalCommonDriver*)*var)->stop();
+	*var = NULL;
+	drv = dd->drv;
+	if ((err=((const HalCommonDriver*)drv)->start(parms)) != NULL)
+		error("Unable to load driver %s(%s). The error was: %s\n", dd->name, dd->longname, err);
+	*var = drv;
+}
+
+static void showhelp(void)
+{
+	char buf[4096], *p;
+	const DriverClass *dc = _driver_classes;
+	const DriverDesc *dd;
+	int i;
+
+	p = strecpy(buf,
+		"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"
+		"  -r res              = Set resolution (for instance 800x600)\n"
+		"  -h                  = Display this help text\n"
+		"  -t date             = Set starting date\n"
+		"  -d [[fac=]lvl[,...]]= Debug mode\n"
+		"  -l lng              = Select Language\n"
+		"  -e                  = Start Editor\n"
+		"  -g [savegame]       = Start new/save game immediately\n"
+		"  -G seed             = Set random seed\n"
+		"  -n [ip#player:port] = Start networkgame\n"
+		"  -D                  = Start dedicated server\n"
+		#if !defined(__MORPHOS__) && !defined(__AMIGA__)
+		"  -f                  = Fork into the background (dedicated only)\n"
+		#endif
+		"  -i                  = Force to use the DOS palette (use this if you see a lot of pink)\n"
+		"  -p #player          = Player as #player (deprecated) (network only)\n"
+		"  -c config_file      = Use 'config_file' instead of 'openttd.cfg'\n",
+		lastof(buf)
+	);
+
+	for(i=0; i!=lengthof(_driver_classes); i++,dc++) {
+		p += sprintf(p, "List of %s drivers:\n", dc->name);
+		dd = dc->descs;
+		do {
+			p += sprintf(p, "%10s: %s\n", dd->name, dd->longname);
+		} while ((++dd)->name);
+	}
+
+	ShowInfo(buf);
+}
+
+
+const char *GetDriverParam(const char * const *parm, const char *name)
+{
+	const char *p;
+	int len = strlen(name);
+	while ((p = *parm++) != NULL) {
+		if (!strncmp(p,name,len)) {
+			if (p[len] == '=') return p + len + 1;
+			if (p[len] == 0)   return p + len;
+		}
+	}
+	return NULL;
+}
+
+bool GetDriverParamBool(const char * const *parm, const char *name)
+{
+	const char *p = GetDriverParam(parm, name);
+	return p != NULL;
+}
+
+int GetDriverParamInt(const char * const *parm, const char *name, int def)
+{
+	const char *p = GetDriverParam(parm, name);
+	return p != NULL ? atoi(p) : def;
+}
+
+typedef struct {
+	char *opt;
+	int numleft;
+	char **argv;
+	const char *options;
+	char *cont;
+} MyGetOptData;
+
+static void MyGetOptInit(MyGetOptData *md, int argc, char **argv, const char *options)
+{
+	md->cont = NULL;
+	md->numleft = argc;
+	md->argv = argv;
+	md->options = options;
+}
+
+static int MyGetOpt(MyGetOptData *md)
+{
+	char *s,*r,*t;
+
+	if ((s=md->cont) != NULL)
+		goto md_continue_here;
+
+	while(true) {
+		if (--md->numleft < 0)
+			return -1;
+
+		s = *md->argv++;
+		if (*s == '-') {
+md_continue_here:;
+			s++;
+			if (*s != 0) {
+				// Found argument, try to locate it in options.
+				if (*s == ':' || (r = strchr(md->options, *s)) == NULL) {
+					// ERROR!
+					return -2;
+				}
+				if (r[1] == ':') {
+					// Item wants an argument. Check if the argument follows, or if it comes as a separate arg.
+					if (!*(t = s + 1)) {
+						// It comes as a separate arg. Check if out of args?
+						if (--md->numleft < 0 || *(t = *md->argv) == '-') {
+							// Check if item is optional?
+							if (r[2] != ':')
+								return -2;
+							md->numleft++;
+							t = NULL;
+						} else {
+							md->argv++;
+						}
+					}
+					md->opt = t;
+					md->cont = NULL;
+					return *s;
+				}
+				md->opt = NULL;
+				md->cont = s;
+				return *s;
+			}
+		} else {
+			// This is currently not supported.
+			return -2;
+		}
+	}
+}
+
+
+static void ParseResolution(int res[2], char *s)
+{
+	char *t = strchr(s, 'x');
+	if (t == NULL) {
+		ShowInfoF("Invalid resolution '%s'", s);
+		return;
+	}
+
+	res[0] = clamp(strtoul(s, NULL, 0), 64, MAX_SCREEN_WIDTH);
+	res[1] = clamp(strtoul(t + 1, NULL, 0), 64, MAX_SCREEN_HEIGHT);
+}
+
+static void InitializeDynamicVariables(void)
+{
+	/* Dynamic stuff needs to be initialized somewhere... */
+	_station_sort  = NULL;
+	_vehicle_sort  = NULL;
+	_town_sort     = NULL;
+	_industry_sort = NULL;
+}
+
+static void UnInitializeDynamicVariables(void)
+{
+	/* Dynamic stuff needs to be free'd somewhere... */
+	CleanPool(&_town_pool);
+	CleanPool(&_industry_pool);
+	CleanPool(&_station_pool);
+	CleanPool(&_vehicle_pool);
+	CleanPool(&_sign_pool);
+	CleanPool(&_order_pool);
+
+	free(_station_sort);
+	free(_vehicle_sort);
+	free(_town_sort);
+	free(_industry_sort);
+}
+
+static void UnInitializeGame(void)
+{
+	UnInitWindowSystem();
+	UnInitNewgrEngines();
+
+	free(_config_file);
+}
+
+static void LoadIntroGame(void)
+{
+	char filename[256];
+
+	_game_mode = GM_MENU;
+	CLRBITS(_display_opt, DO_TRANS_BUILDINGS); // don't make buildings transparent in intro
+	_opt_ptr = &_opt_newgame;
+
+	GfxLoadSprites();
+	LoadStringWidthTable();
+
+	// Setup main window
+	ResetWindowSystem();
+	SetupColorsAndInitialWindow();
+
+	// Generate a world.
+	sprintf(filename, "%sopntitle.dat",  _path.data_dir);
+	if (SaveOrLoad(filename, SL_LOAD) != SL_OK) {
+#if defined SECOND_DATA_DIR
+		sprintf(filename, "%sopntitle.dat",  _path.second_data_dir);
+		if (SaveOrLoad(filename, SL_LOAD) != SL_OK)
+#endif
+			GenerateWorld(1, 6, 6); // if failed loading, make empty world.
+	}
+
+	_pause = 0;
+	_local_player = 0;
+	MarkWholeScreenDirty();
+
+	// Play main theme
+	if (_music_driver->is_song_playing()) ResetMusic();
+}
+
+extern void DedicatedFork(void);
+extern void CheckExternalFiles(void);
+
+int ttd_main(int argc, char* argv[])
+{
+	MyGetOptData mgo;
+	int i;
+	bool network = false;
+	char *network_conn = NULL;
+	char *language = NULL;
+	const char *optformat;
+	char musicdriver[16], sounddriver[16], videodriver[16];
+	int resolution[2] = {0,0};
+	uint startdate = -1;
+	bool dedicated;
+
+	musicdriver[0] = sounddriver[0] = videodriver[0] = 0;
+
+	_game_mode = GM_MENU;
+	_switch_mode = SM_MENU;
+	_switch_mode_errorstr = INVALID_STRING_ID;
+	_dedicated_forks = false;
+	dedicated = false;
+	_config_file = NULL;
+
+	// The last param of the following function means this:
+	//   a letter means: it accepts that param (e.g.: -h)
+	//   a ':' behind it means: it need a param (e.g.: -m<driver>)
+	//   a '::' behind it means: it can optional have a param (e.g.: -d<debug>)
+	#if !defined(__MORPHOS__) && !defined(__AMIGA__) && !defined(WIN32)
+		optformat = "m:s:v:hDfn::l:eit:d::r:g::G:p:c:";
+	#else
+		optformat = "m:s:v:hDn::l:eit:d::r:g::G:p:c:"; // no fork option
+	#endif
+
+	MyGetOptInit(&mgo, argc-1, argv+1, optformat);
+	while ((i = MyGetOpt(&mgo)) != -1) {
+		switch(i) {
+		case 'm': ttd_strlcpy(musicdriver, mgo.opt, sizeof(musicdriver)); break;
+		case 's': ttd_strlcpy(sounddriver, mgo.opt, sizeof(sounddriver)); break;
+		case 'v': ttd_strlcpy(videodriver, mgo.opt, sizeof(videodriver)); break;
+		case 'D': {
+				sprintf(musicdriver,"null");
+				sprintf(sounddriver,"null");
+				sprintf(videodriver,"dedicated");
+				dedicated = true;
+			} break;
+		case 'f': {
+				_dedicated_forks = true;
+			}; break;
+		case 'n': {
+				network = true;
+				if (mgo.opt)
+					// Optional, you can give an IP
+					network_conn = mgo.opt;
+				else
+					network_conn = NULL;
+			} break;
+		case 'r': ParseResolution(resolution, mgo.opt); break;
+		case 'l': {
+				language = mgo.opt;
+			} break;
+		case 't': {
+				startdate = atoi(mgo.opt);
+			} break;
+		case 'd': {
+#if defined(WIN32)
+				CreateConsole();
+#endif
+				if (mgo.opt)
+					SetDebugString(mgo.opt);
+			} break;
+		case 'e': _switch_mode = SM_EDITOR; break;
+		case 'i': _use_dos_palette = true; break;
+		case 'g':
+			if (mgo.opt) {
+				strcpy(_file_to_saveload.name, mgo.opt);
+				_switch_mode = SM_LOAD;
+			} else
+				_switch_mode = SM_NEWGAME;
+			break;
+		case 'G':
+			_random_seeds[0][0] = atoi(mgo.opt);
+			break;
+		case 'p': {
+			int i = atoi(mgo.opt);
+			// Play as an other player in network games
+			if (IS_INT_INSIDE(i, 1, MAX_PLAYERS)) _network_playas = i;
+			break;
+		}
+		case 'c':
+			_config_file = strdup(mgo.opt);
+			break;
+		case -2:
+ 		case 'h':
+			showhelp();
+			return 0;
+		}
+	}
+
+	DeterminePaths();
+	CheckExternalFiles();
+
+#ifdef UNIX
+	// We must fork here, or we'll end up without some resources we need (like sockets)
+	if (_dedicated_forks)
+		DedicatedFork();
+#endif
+
+	LoadFromConfig();
+	CheckConfig();
+	LoadFromHighScore();
+
+	// override config?
+	if (musicdriver[0]) ttd_strlcpy(_ini_musicdriver, musicdriver, sizeof(_ini_musicdriver));
+	if (sounddriver[0]) ttd_strlcpy(_ini_sounddriver, sounddriver, sizeof(_ini_sounddriver));
+	if (videodriver[0]) ttd_strlcpy(_ini_videodriver, videodriver, sizeof(_ini_videodriver));
+	if (resolution[0]) { _cur_resolution[0] = resolution[0]; _cur_resolution[1] = resolution[1]; }
+	if (startdate != (uint)-1) _patches.starting_date = startdate;
+
+	if (_dedicated_forks && !dedicated)
+		_dedicated_forks = false;
+
+	// enumerate language files
+	InitializeLanguagePacks();
+
+	// initialize screenshot formats
+	InitializeScreenshotFormats();
+
+	// initialize airport state machines
+	InitializeAirports();
+
+	/* initialize all variables that are allocated dynamically */
+	InitializeDynamicVariables();
+
+	// Sample catalogue
+	DEBUG(misc, 1) ("Loading sound effects...");
+	_os_version = GetOSVersion();
+	MxInitialize(11025);
+	SoundInitialize("sample.cat");
+
+	// This must be done early, since functions use the InvalidateWindow* calls
+	InitWindowSystem();
+
+	GfxLoadSprites();
+	LoadStringWidthTable();
+
+	DEBUG(misc, 1) ("Loading drivers...");
+	LoadDriver(SOUND_DRIVER, _ini_sounddriver);
+	LoadDriver(MUSIC_DRIVER, _ini_musicdriver);
+	LoadDriver(VIDEO_DRIVER, _ini_videodriver); // load video last, to prevent an empty window while sound and music loads
+	_savegame_sort_order = 1; // default sorting of savegames is by date, newest first
+
+#ifdef ENABLE_NETWORK
+	// initialize network-core
+	NetworkStartUp();
+#endif /* ENABLE_NETWORK */
+
+	_opt_ptr = &_opt_newgame;
+
+	/* XXX - ugly hack, if diff_level is 9, it means we got no setting from the config file */
+	if (_opt_newgame.diff_level == 9)
+		SetDifficultyLevel(0, &_opt_newgame);
+
+	// initialize the ingame console
+	IConsoleInit();
+	InitializeGUI();
+	IConsoleCmdExec("exec scripts/autoexec.scr 0");
+
+	InitPlayerRandoms();
+
+	GenerateWorld(1, 6, 6); // Make the viewport initialization happy
+
+#ifdef ENABLE_NETWORK
+	if ((network) && (_network_available)) {
+		if (network_conn != NULL) {
+			const char *port = NULL;
+			const char *player = NULL;
+			uint16 rport;
+
+			rport = NETWORK_DEFAULT_PORT;
+
+			ParseConnectionString(&player, &port, network_conn);
+
+			if (player != NULL) _network_playas = atoi(player);
+			if (port != NULL) rport = atoi(port);
+
+			LoadIntroGame();
+			_switch_mode = SM_NONE;
+			NetworkClientConnectGame(network_conn, rport);
+		}
+	}
+#endif /* ENABLE_NETWORK */
+
+	while (_video_driver->main_loop() == ML_SWITCHDRIVER) {}
+
+	JoinOTTDThread();
+	IConsoleFree();
+
+#ifdef ENABLE_NETWORK
+	if (_network_available) {
+		// Shut down the network and close any open connections
+		NetworkDisconnect();
+		NetworkUDPClose();
+		NetworkShutDown();
+	}
+#endif /* ENABLE_NETWORK */
+
+	_video_driver->stop();
+	_music_driver->stop();
+	_sound_driver->stop();
+
+	SaveToConfig();
+	SaveToHighScore();
+
+	// uninitialize airport state machines
+	UnInitializeAirports();
+
+	/* uninitialize variables that are allocated dynamic */
+	UnInitializeDynamicVariables();
+
+	/* Close all and any open filehandles */
+	FioCloseAll();
+	UnInitializeGame();
+
+	return 0;
+}
+
+static void ShowScreenshotResult(bool b)
+{
+	if (b) {
+		SetDParam(0, STR_SPEC_SCREENSHOT_NAME);
+		ShowErrorMessage(INVALID_STRING_ID, STR_031B_SCREENSHOT_SUCCESSFULLY, 0, 0);
+	} else {
+		ShowErrorMessage(INVALID_STRING_ID, STR_031C_SCREENSHOT_FAILED, 0, 0);
+	}
+
+}
+
+static void MakeNewGame(void)
+{
+	_game_mode = GM_NORMAL;
+
+	// Copy in game options
+	_opt_ptr = &_opt;
+	memcpy(_opt_ptr, &_opt_newgame, sizeof(GameOptions));
+
+	GfxLoadSprites();
+
+	// Reinitialize windows
+	ResetWindowSystem();
+	LoadStringWidthTable();
+
+	SetupColorsAndInitialWindow();
+
+	// Randomize world
+	GenerateWorld(0, _patches.map_x, _patches.map_y);
+
+	// In a dedicated server, the server does not play
+	if (_network_dedicated) {
+		_local_player = OWNER_SPECTATOR;
+	}	else {
+		// Create a single player
+		DoStartupNewPlayer(false);
+
+		_local_player = 0;
+	}
+
+	MarkWholeScreenDirty();
+}
+
+static void MakeNewEditorWorld(void)
+{
+	_game_mode = GM_EDITOR;
+
+	// Copy in game options
+	_opt_ptr = &_opt;
+	memcpy(_opt_ptr, &_opt_newgame, sizeof(GameOptions));
+
+	GfxLoadSprites();
+
+	// Re-init the windowing system
+	ResetWindowSystem();
+
+	// Create toolbars
+	SetupColorsAndInitialWindow();
+
+	// Startup the game system
+	GenerateWorld(1, _patches.map_x, _patches.map_y);
+
+	_local_player = OWNER_NONE;
+	MarkWholeScreenDirty();
+}
+
+void StartupPlayers(void);
+void StartupDisasters(void);
+
+/**
+ * Start Scenario starts a new game based on a scenario.
+ * Eg 'New Game' --> select a preset scenario
+ * This starts a scenario based on your current difficulty settings
+ */
+static void StartScenario(void)
+{
+	_game_mode = GM_NORMAL;
+
+	// invalid type
+	if (_file_to_saveload.mode == SL_INVALID) {
+		printf("Savegame is obsolete or invalid format: %s\n", _file_to_saveload.name);
+		ShowErrorMessage(_error_message, STR_4009_GAME_LOAD_FAILED, 0, 0);
+		_game_mode = GM_MENU;
+		return;
+	}
+
+	GfxLoadSprites();
+
+	// Reinitialize windows
+	ResetWindowSystem();
+	LoadStringWidthTable();
+
+	SetupColorsAndInitialWindow();
+
+	// Load game
+	if (SaveOrLoad(_file_to_saveload.name, _file_to_saveload.mode) != SL_OK) {
+		LoadIntroGame();
+		ShowErrorMessage(_error_message, STR_4009_GAME_LOAD_FAILED, 0, 0);
+	}
+
+	_opt_ptr = &_opt;
+	memcpy(&_opt_ptr->diff, &_opt_newgame.diff, sizeof(GameDifficulty));
+	_opt.diff_level = _opt_newgame.diff_level;
+
+	// Inititalize data
+	StartupPlayers();
+	StartupEngines();
+	StartupDisasters();
+
+	_local_player = 0;
+
+	MarkWholeScreenDirty();
+}
+
+bool SafeSaveOrLoad(const char *filename, int mode, int newgm)
+{
+	byte ogm = _game_mode;
+	int r;
+
+	_game_mode = newgm;
+	r = SaveOrLoad(filename, mode);
+	if (r == SL_REINIT) {
+		if (ogm == GM_MENU)
+			LoadIntroGame();
+		else if (ogm == GM_EDITOR)
+			MakeNewEditorWorld();
+		else
+			MakeNewGame();
+		return false;
+	} else if (r != SL_OK) {
+		_game_mode = ogm;
+		return false;
+	} else
+		return true;
+}
+
+void SwitchMode(int new_mode)
+{
+	_in_state_game_loop = true;
+
+#ifdef ENABLE_NETWORK
+	// If we are saving something, the network stays in his current state
+	if (new_mode != SM_SAVE) {
+		// If the network is active, make it not-active
+		if (_networking) {
+			if (_network_server && (new_mode == SM_LOAD || new_mode == SM_NEWGAME)) {
+				NetworkReboot();
+				NetworkUDPClose();
+			} else {
+				NetworkDisconnect();
+				NetworkUDPClose();
+			}
+		}
+
+		// 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) {
+				NetworkServerStart();
+			} else {
+				// This client no longer wants to be a network-server
+				_is_network_server = false;
+			}
+		}
+	}
+#endif /* ENABLE_NETWORK */
+
+	switch (new_mode) {
+	case SM_EDITOR: /* Switch to scenario editor */
+		MakeNewEditorWorld();
+		break;
+
+	case SM_NEWGAME: /* New Game --> 'Random game' */
+#ifdef ENABLE_NETWORK
+		if (_network_server)
+			snprintf(_network_game_info.map_name, 40, "Random");
+#endif /* ENABLE_NETWORK */
+		MakeNewGame();
+		break;
+
+	case SM_START_SCENARIO: /* New Game --> Choose one of the preset scenarios */
+		StartScenario();
+		break;
+
+	case SM_LOAD: { /* Load game, Play Scenario */
+		_opt_ptr = &_opt;
+
+		_error_message = INVALID_STRING_ID;
+		if (!SafeSaveOrLoad(_file_to_saveload.name, _file_to_saveload.mode, GM_NORMAL)) {
+			LoadIntroGame();
+			ShowErrorMessage(_error_message, STR_4009_GAME_LOAD_FAILED, 0, 0);
+		} else {
+			_local_player = 0;
+			DoCommandP(0, 0, 0, NULL, CMD_PAUSE); // decrease pause counter (was increased from opening load dialog)
+#ifdef ENABLE_NETWORK
+			if (_network_server)
+				snprintf(_network_game_info.map_name, 40, "Loaded game");
+#endif /* ENABLE_NETWORK */
+		}
+		break;
+	}
+
+	case SM_LOAD_SCENARIO: { /* Load scenario from scenario editor */
+		int i;
+
+		if (SafeSaveOrLoad(_file_to_saveload.name, _file_to_saveload.mode, GM_EDITOR)) {
+			_opt_ptr = &_opt;
+
+			_local_player = OWNER_NONE;
+			_generating_world = true;
+			// delete all players.
+			for (i = 0; i != MAX_PLAYERS; i++) {
+				ChangeOwnershipOfPlayerItems(i, 0xff);
+				_players[i].is_active = false;
+			}
+			_generating_world = false;
+			// delete all stations owned by a player
+			DeleteAllPlayerStations();
+
+#ifdef ENABLE_NETWORK
+			if (_network_server)
+				snprintf(_network_game_info.map_name, 40, "Loaded scenario");
+#endif /* ENABLE_NETWORK */
+		} else
+			ShowErrorMessage(INVALID_STRING_ID, STR_4009_GAME_LOAD_FAILED, 0, 0);
+
+		break;
+	}
+
+
+	case SM_MENU: /* Switch to game intro menu */
+		LoadIntroGame();
+		break;
+
+	case SM_SAVE: /* Save game */
+		if (SaveOrLoad(_file_to_saveload.name, SL_SAVE) != SL_OK)
+			ShowErrorMessage(INVALID_STRING_ID, STR_4007_GAME_SAVE_FAILED, 0, 0);
+		else
+			DeleteWindowById(WC_SAVELOAD, 0);
+		break;
+
+	case SM_GENRANDLAND: /* Generate random land within scenario editor */
+		GenerateWorld(2, _patches.map_x, _patches.map_y);
+		// XXX: set date
+		_local_player = OWNER_NONE;
+		MarkWholeScreenDirty();
+		break;
+	}
+
+	if (_switch_mode_errorstr != INVALID_STRING_ID)
+		ShowErrorMessage(INVALID_STRING_ID,_switch_mode_errorstr,0,0);
+
+	_in_state_game_loop = false;
+}
+
+
+// State controlling game loop.
+// The state must not be changed from anywhere
+// but here.
+// That check is enforced in DoCommand.
+void StateGameLoop(void)
+{
+	// dont execute the state loop during pause
+	if (_pause) return;
+
+	_in_state_game_loop = true;
+	// _frame_counter is increased somewhere else when in network-mode
+	//  Sidenote: _frame_counter is ONLY used for _savedump in non-MP-games
+	//    Should that not be deleted? If so, the next 2 lines can also be deleted
+	if (!_networking)
+		_frame_counter++;
+
+	if (_savedump_path[0] && (uint)_frame_counter >= _savedump_first && (uint)(_frame_counter -_savedump_first) % _savedump_freq == 0 ) {
+		char buf[100];
+		sprintf(buf, "%s%.5d.sav", _savedump_path, _frame_counter);
+		SaveOrLoad(buf, SL_SAVE);
+		if ((uint)_frame_counter >= _savedump_last) exit(1);
+	}
+
+	if (_game_mode == GM_EDITOR) {
+		RunTileLoop();
+		CallVehicleTicks();
+		CallLandscapeTick();
+		CallWindowTickEvent();
+		NewsLoop();
+	} else {
+		// All these actions has to be done from OWNER_NONE
+		//  for multiplayer compatibility
+		uint p = _current_player;
+		_current_player = OWNER_NONE;
+
+		AnimateAnimatedTiles();
+		IncreaseDate();
+		RunTileLoop();
+		CallVehicleTicks();
+		CallLandscapeTick();
+
+		// To bad the AI does not work in multiplayer, because states are not saved
+		//  perfectly
+		if (!disable_computer && !_networking)
+			RunOtherPlayersLoop();
+
+		CallWindowTickEvent();
+		NewsLoop();
+		_current_player = p;
+	}
+
+	_in_state_game_loop = false;
+}
+
+static void DoAutosave(void)
+{
+	char buf[200];
+
+	if (_patches.keep_all_autosave && _local_player != OWNER_SPECTATOR) {
+		const Player *p = DEREF_PLAYER(_local_player);
+		char *s;
+		sprintf(buf, "%s%s", _path.autosave_dir, PATHSEP);
+
+		SetDParam(0, p->name_1);
+		SetDParam(1, p->name_2);
+		SetDParam(2, _date);
+		s = (char*)GetString(buf + strlen(_path.autosave_dir) + strlen(PATHSEP), STR_4004);
+		strcpy(s, ".sav");
+	} else { /* Save a maximum of 15 autosaves */
+		int n = _autosave_ctr;
+		_autosave_ctr = (_autosave_ctr + 1) & 15;
+		sprintf(buf, "%s%sautosave%d.sav", _path.autosave_dir, PATHSEP, n);
+	}
+
+	DEBUG(misc, 2) ("Autosaving to %s", buf);
+	if (SaveOrLoad(buf, SL_SAVE) != SL_OK)
+		ShowErrorMessage(INVALID_STRING_ID, STR_AUTOSAVE_FAILED, 0, 0);
+}
+
+static void ScrollMainViewport(int x, int y)
+{
+	if (_game_mode != GM_MENU) {
+		Window *w = FindWindowById(WC_MAIN_WINDOW, 0);
+		assert(w);
+
+		WP(w,vp_d).scrollpos_x += x << w->viewport->zoom;
+		WP(w,vp_d).scrollpos_y += y << w->viewport->zoom;
+	}
+}
+
+static const int8 scrollamt[16][2] = {
+	{ 0, 0},
+	{-2, 0}, // 1:left
+	{ 0,-2}, // 2:up
+	{-2,-1}, // 3:left + up
+	{ 2, 0}, // 4:right
+	{ 0, 0}, // 5:left + right
+	{ 2,-1}, // 6:right + up
+	{ 0,-2}, // 7:left + right + up = up
+	{ 0 ,2}, // 8:down
+	{-2 ,1}, // 9:down+left
+	{ 0, 0}, // 10:impossible
+	{-2, 0}, // 11:left + up + down = left
+	{ 2, 1}, // 12:down+right
+	{ 0, 2}, // 13:left + right + down = down
+	{ 0,-2}, // 14:left + right + up = up
+	{ 0, 0}, // 15:impossible
+};
+
+static void HandleKeyScrolling(void)
+{
+	if (_dirkeys && !_no_scroll) {
+		int factor = _shift_pressed ? 50 : 10;
+		ScrollMainViewport(scrollamt[_dirkeys][0] * factor, scrollamt[_dirkeys][1] * factor);
+	}
+}
+
+void GameLoop(void)
+{
+	int m;
+
+	// autosave game?
+	if (_do_autosave) {
+		_do_autosave = false;
+		DoAutosave();
+		RedrawAutosave();
+	}
+
+	// handle scrolling of the main window
+	if (_dirkeys) HandleKeyScrolling();
+
+	// make a screenshot?
+	if ((m=_make_screenshot) != 0) {
+		_make_screenshot = 0;
+		switch(m) {
+		case 1: // make small screenshot
+			UndrawMouseCursor();
+			ShowScreenshotResult(MakeScreenshot());
+			break;
+		case 2: // make large screenshot
+			ShowScreenshotResult(MakeWorldScreenshot(-(int)MapMaxX() * 32, 0, MapMaxX() * 64, MapSizeY() * 32, 0));
+			break;
+		}
+	}
+
+	// switch game mode?
+	if ((m=_switch_mode) != SM_NONE) {
+		_switch_mode = SM_NONE;
+		SwitchMode(m);
+	}
+
+	IncreaseSpriteLRU();
+	InteractiveRandom();
+
+	if (_scroller_click_timeout > 3)
+		_scroller_click_timeout -= 3;
+	else
+		_scroller_click_timeout = 0;
+
+	_caret_timer += 3;
+	_timer_counter+=8;
+	CursorTick();
+
+#ifdef ENABLE_NETWORK
+	// Check for UDP stuff
+	NetworkUDPGameLoop();
+
+	if (_networking) {
+		// 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(_network_last_host, _network_last_port);
+		}
+		// Singleplayer
+		StateGameLoop();
+	}
+#else
+	StateGameLoop();
+#endif /* ENABLE_NETWORK */
+
+	if (!_pause && _display_opt&DO_FULL_ANIMATION)
+		DoPaletteAnimations();
+
+	if (!_pause || _cheats.build_in_pause.value)
+		MoveAllTextEffects();
+
+	InputLoop();
+
+	MusicLoop();
+}
+
+void BeforeSaveGame(void)
+{
+	Window *w = FindWindowById(WC_MAIN_WINDOW, 0);
+
+	if (w != NULL) {
+		_saved_scrollpos_x = WP(w,vp_d).scrollpos_x;
+		_saved_scrollpos_y = WP(w,vp_d).scrollpos_y;
+		_saved_scrollpos_zoom = w->viewport->zoom;
+	}
+}
+
+static void ConvertTownOwner(void)
+{
+	uint tile;
+
+	for (tile = 0; tile != MapSize(); tile++) {
+		if (IsTileType(tile, MP_STREET)) {
+			if ((_map5[tile] & 0xF0) == 0x10 && _map3_lo[tile] & 0x80)
+				_map3_lo[tile] = OWNER_TOWN;
+
+			if (_map_owner[tile] & 0x80)
+				_map_owner[tile] = OWNER_TOWN;
+		} else if (IsTileType(tile, MP_TUNNELBRIDGE)) {
+			if (_map_owner[tile] & 0x80)
+				_map_owner[tile] = OWNER_TOWN;
+		}
+	}
+}
+
+// before savegame version 4, the name of the company determined if it existed
+static void CheckIsPlayerActive(void)
+{
+	Player *p;
+	FOR_ALL_PLAYERS(p) {
+		if (p->name_1 != 0) {
+			p->is_active = true;
+		}
+	}
+}
+
+// since savegame version 4.1, exclusive transport rights are stored at towns
+static void UpdateExclusiveRights(void)
+{
+	Town *t;
+	FOR_ALL_TOWNS(t) if (t->xy != 0) {
+		t->exclusivity=(byte)-1;
+	}
+
+	/* FIXME old exclusive rights status is not being imported (stored in s->blocked_months_obsolete)
+			could be implemented this way:
+			1.) Go through all stations
+					Build an array town_blocked[ town_id ][ player_id ]
+				 that stores if at least one station in that town is blocked for a player
+			2.) Go through that array, if you find a town that is not blocked for
+				 	one player, but for all others, then give him exclusivity.
+	*/
+}
+
+const byte convert_currency[] = {
+	 0,  1, 12,  8,  3,
+	10, 14, 19,  4,  5,
+	 9, 11, 13,  6, 17,
+	16, 22, 21,  7, 15,
+	18,  2, 20, };
+
+// since savegame version 4.2 the currencies are arranged differently
+static void UpdateCurrencies(void)
+{
+	_opt.currency = convert_currency[_opt.currency];
+}
+
+/* Up to revision 1413 the invisible tiles at the southern border have not been
+ * MP_VOID, even though they should have. This is fixed by this function
+ */
+static void UpdateVoidTiles(void)
+{
+	uint i;
+
+	for (i = 0; i < MapMaxY(); ++i)
+		SetTileType(i * MapSizeX() + MapMaxX(), MP_VOID);
+	for (i = 0; i < MapSizeX(); ++i)
+		SetTileType(MapSizeX() * MapMaxY() + i, MP_VOID);
+}
+
+// since savegame version 6.0 each sign has an "owner", signs without owner (from old games are set to 255)
+static void UpdateSignOwner(void)
+{
+	SignStruct *ss;
+	FOR_ALL_SIGNS(ss) {
+		ss->owner = OWNER_NONE; // no owner
+	}
+}
+
+extern void UpdateOldAircraft( void );
+extern void UpdateOilRig( void );
+
+bool AfterLoadGame(uint version)
+{
+	Window *w;
+	ViewPort *vp;
+
+	// in version 2.1 of the savegame, town owner was unified.
+	if (version <= 0x200) {
+		ConvertTownOwner();
+	}
+
+	// from version 4.1 of the savegame, exclusive rights are stored at towns
+	if (version <= 0x400) {
+		UpdateExclusiveRights();
+	}
+
+	// from version 4.2 of the savegame, currencies are in a different order
+	if (version <= 0x401) {
+		UpdateCurrencies();
+	}
+
+	// from version 6.0 of the savegame, signs have an "owner"
+	if (version <= 0x600) {
+		UpdateSignOwner();
+	}
+
+	/* In old version there seems to be a problem that water is owned by
+	    OWNER_NONE, not OWNER_WATER.. I can't replicate it for the current
+	    (0x402) version, so I just check when versions are older, and then
+	    walk through the whole map.. */
+	if (version <= 0x402) {
+		TileIndex tile = TILE_XY(0,0);
+		uint w = MapSizeX();
+		uint h = MapSizeY();
+
+		BEGIN_TILE_LOOP(tile_cur, w, h, tile)
+			if (IsTileType(tile_cur, MP_WATER) && _map_owner[tile_cur] >= MAX_PLAYERS)
+				_map_owner[tile_cur] = OWNER_WATER;
+		END_TILE_LOOP(tile_cur, w, h, tile)
+	}
+
+	// convert road side to my format.
+	if (_opt.road_side) _opt.road_side = 1;
+
+	// Load the sprites
+	GfxLoadSprites();
+
+	// Update current year
+	SetDate(_date);
+
+	// reinit the landscape variables (landscape might have changed)
+	InitializeLandscapeVariables(true);
+
+	// Update all vehicles
+	AfterLoadVehicles();
+
+	// Update all waypoints
+	if (version < 0x0C00)
+		FixOldWaypoints();
+
+	UpdateAllWaypointSigns();
+
+	// in version 2.2 of the savegame, we have new airports
+	if (version <= 0x201) {
+		UpdateOldAircraft();
+	}
+
+	UpdateAllStationVirtCoord();
+
+	// Setup town coords
+	AfterLoadTown();
+	UpdateAllSignVirtCoords();
+
+	// make sure there is a town in the game
+	if (_game_mode == GM_NORMAL && !ClosestTownFromTile(0, (uint)-1))
+	{
+		_error_message = STR_NO_TOWN_IN_SCENARIO;
+		return false;
+	}
+
+	// Initialize windows
+	ResetWindowSystem();
+	SetupColorsAndInitialWindow();
+
+	w = FindWindowById(WC_MAIN_WINDOW, 0);
+
+	WP(w,vp_d).scrollpos_x = _saved_scrollpos_x;
+	WP(w,vp_d).scrollpos_y = _saved_scrollpos_y;
+
+	vp = w->viewport;
+	vp->zoom = _saved_scrollpos_zoom;
+	vp->virtual_width = vp->width << vp->zoom;
+	vp->virtual_height = vp->height << vp->zoom;
+
+
+	// in version 4.0 of the savegame, is_active was introduced to determine
+	// if a player does exist, rather then checking name_1
+	if (version <= 0x400) {
+		CheckIsPlayerActive();
+	}
+
+	// the void tiles on the southern border used to belong to a wrong class.
+	if (version <= 0x402)
+		UpdateVoidTiles();
+
+	// If Load Scenario / New (Scenario) Game is used,
+	//  a player does not exist yet. So create one here.
+	// 1 exeption: network-games. Those can have 0 players
+	//   But this exeption is not true for network_servers!
+	if (!_players[0].is_active && (!_networking || (_networking && _network_server)))
+		DoStartupNewPlayer(false);
+
+	DoZoomInOutWindow(ZOOM_NONE, w); // update button status
+	MarkWholeScreenDirty();
+
+	//In 5.1, Oilrigs have been moved (again)
+	if (version <= 0x500) {
+		UpdateOilRig();
+	}
+
+	if (version <= 0x600) {
+		BEGIN_TILE_LOOP(tile, MapSizeX(), MapSizeY(), 0) {
+			if (IsTileType(tile, MP_HOUSE)) {
+				_map3_hi[tile] = _map2[tile];
+				//XXX magic
+				SetTileType(tile, MP_VOID);
+				_map2[tile] = ClosestTownFromTile(tile,(uint)-1)->index;
+				SetTileType(tile, MP_HOUSE);
+			} else if (IsTileType(tile, MP_STREET)) {
+				//XXX magic
+				SetTileType(tile, MP_VOID);
+				_map3_hi[tile] |= (_map2[tile] << 4);
+				if ( _map_owner[tile] == OWNER_TOWN)
+					_map2[tile] = ClosestTownFromTile(tile,(uint)-1)->index;
+				else
+					_map2[tile] = 0;
+				SetTileType(tile, MP_STREET);
+			}
+		} END_TILE_LOOP(tile, MapSizeX(), MapSizeY(), 0);
+	}
+
+	if (version < 0x900) {
+		Town *t;
+		FOR_ALL_TOWNS(t) {
+			UpdateTownMaxPass(t);
+		}
+	}
+
+	return true;
+}