(svn r1) Import of revision 975 of old (crashed) SVN

1 files changed, 785 insertions, 0 deletions

diff --git a/misc.c b/misc.c
new file mode 100644
index 000000000..2a57f73ba
--- /dev/null
+++ b/misc.c
@@ -0,0 +1,785 @@
+#include "stdafx.h"
+#include "ttd.h"
+#include "vehicle.h"
+#include "gfx.h"
+#include "assert.h"
+#include "saveload.h"
+
+extern void StartupEconomy();
+extern void InitNewsItemStructs();
+
+static uint32 _random_seed_3, _random_seed_4;
+
+byte _name_array[512][32];
+
+static INLINE uint32 ROR(uint32 x, int n)
+{
+	return (x >> n) + (x << ((sizeof(x)*8)-n));
+}
+
+
+uint32 Random()
+{
+	uint32 t = _random_seed_2;
+	uint32 s = _random_seed_1;
+	_random_seed_1 = s + ROR(t ^ 0x1234567F, 7);
+	return _random_seed_2 = ROR(s, 3);
+}
+
+uint RandomRange(uint max)
+{
+	return (uint16)Random() * max >> 16;
+}
+
+uint32 InteractiveRandom()
+{
+	uint32 t = _random_seed_4;
+	uint32 s = _random_seed_3;
+	_random_seed_3 = s + ROR(t ^ 0x1234567F, 7);
+	return _random_seed_4 = ROR(s, 3);
+}
+
+void memswap(void *a, void *b, size_t size) {
+	void *c = alloca(size);
+	memcpy(c, a, size);
+	memcpy(a, b, size);
+	memcpy(b, c, size);
+}
+
+void SetDate(uint date)
+{
+	YearMonthDay ymd;
+	ConvertDayToYMD(&ymd, _date = date);
+	_cur_year = ymd.year;
+	_cur_month = ymd.month;
+}
+
+void InitializeClearLand();
+void InitializeRail();
+void InitializeRailGui();
+void InitializeRoad();
+void InitializeRoadGui();
+void InitializeAirportGui();
+void InitializeDock();
+void InitializeDockGui();
+void InitializeIndustries();
+void InitializeLandscape();
+void InitializeTowns();
+void InitializeTrees();
+void InitializeStations();
+void InitializeNameMgr();
+void InitializePlayers();
+void InitializeCheats();
+
+void GenerateLandscape();
+void GenerateClearTile();
+
+void GenerateIndustries();
+void GenerateUnmovables();
+void GenerateTowns();
+
+void StartupPlayers();
+void StartupEngines();
+void StartupDisasters();
+void GenerateTrees();
+
+void ConvertGroundTilesIntoWaterTiles();
+
+void InitializeGame()
+{
+	SetObjectToPlace(1, 0, 0, 0);
+
+	_pause = 0;
+	_fast_forward = 0;
+	_tick_counter = 0;
+	_date_fract = 0;
+	_cur_tileloop_tile = 0;
+	_vehicle_id_ctr_day = 0;
+	
+	{
+		uint starting = ConvertIntDate(_patches.starting_date);
+		if ( starting == (uint)-1) starting = 10958;
+		SetDate(starting);
+	}
+
+	InitializeVehicles();
+	_backup_orders_tile = 0;
+
+	InitNewsItemStructs();
+	InitializeLandscape();
+	InitializeClearLand();
+	InitializeRail();
+	InitializeRailGui();
+	InitializeRoad();
+	InitializeRoadGui();
+	InitializeAirportGui();
+	InitializeDock();
+	InitializeDockGui();
+	InitializeTowns();
+	InitializeTrees();
+	InitializeStations();
+	InitializeIndustries();
+	
+	InitializeNameMgr();
+	InitializeTrains();
+
+	InitializePlayers();
+	InitializeCheats();
+
+	InitTextEffects();
+	InitializeAnimatedTiles();
+
+	InitializeLandscapeVariables(false);
+
+	ResetObjectToPlace();
+}
+
+void GenerateWorld(int mode)
+{
+	int i;
+
+	_generating_world = true;
+	InitializeGame();
+	SetObjectToPlace(1, 0, 0, 0);
+
+	// Must start economy early because of the costs.
+	StartupEconomy();
+
+	// Don't generate landscape items when in the scenario editor.
+	if (mode == 1) {
+		// empty world in scenario editor
+		ConvertGroundTilesIntoWaterTiles();
+	} else {
+		GenerateLandscape();
+		GenerateClearTile();
+		
+		// only generate towns, tree and industries in newgame mode.
+		if (mode == 0) {
+			GenerateTowns();
+			GenerateTrees();
+			GenerateIndustries();
+			GenerateUnmovables();
+		}
+	}
+
+	// These are probably pointless when inside the scenario editor.	
+	StartupPlayers();
+	StartupEngines();
+	StartupDisasters();
+	_generating_world = false;
+
+	// No need to run the tile loop in the scenario editor.
+	if (mode != 1) {
+		for(i=0x500; i!=0; i--)
+			RunTileLoop();
+	}
+
+	ResetObjectToPlace();
+}
+
+void DeleteName(StringID id)
+{
+	if ((id & 0xF800) == 0x7800) {
+		memset(_name_array[id & 0x1FF], 0, sizeof(_name_array[id & 0x1FF]));
+	}
+}
+
+byte *GetName(int id, byte *buff)
+{
+	byte *b;
+
+	if (id & 0x600) {
+		if (id & 0x200) {
+			if (id & 0x400) {
+				GetParamInt32();
+				GetParamUint16();
+			} else {
+				GetParamUint16();
+			}
+		} else {
+			GetParamInt32();
+		}
+	}
+
+	b = _name_array[(id&~0x600)];
+	while ((*buff++ = *b++) != 0);
+
+	return buff - 1;
+}
+
+
+void InitializeCheats()
+{
+	memset(&_cheats, 0, sizeof(Cheats)); 
+}
+
+
+void InitializeNameMgr()
+{
+	memset(_name_array, 0, sizeof(_name_array));
+}
+
+StringID AllocateName(const byte *name, byte skip)
+{
+	int free_item = -1;
+	const byte *names;
+	byte *dst;
+	int i;
+
+	names = &_name_array[0][0];
+
+	for(i=0; i!=512; i++,names+=sizeof(_name_array[0])) {
+		if (names[0] == 0) {
+			if (free_item == -1)
+				free_item = i;
+		} else {
+			if (str_eq(names, name)) {
+				_error_message = STR_0132_CHOSEN_NAME_IN_USE_ALREADY;
+				return 0;
+			}
+		}
+	}
+
+	if (free_item < 0) {
+		_error_message = STR_0131_TOO_MANY_NAMES_DEFINED;
+		return 0;
+	}
+
+	dst=_name_array[free_item];
+
+	for(i=0; (dst[i] = name[i]) != 0 && ++i != 32; ) {}
+	dst[31] = 0;
+		
+	return free_item | 0x7800 | (skip << 8);
+}
+
+const TileIndexDiff _tileoffs_by_dir[4] = {
+	TILE_XY(-1, 0),
+	TILE_XY(0, 1),
+	TILE_XY(1, 0),
+	TILE_XY(0, -1),
+};
+
+
+#define M(a,b) ((a<<5)|b)
+static const uint16 _month_date_from_year_day[] = {
+M(0,1),M(0,2),M(0,3),M(0,4),M(0,5),M(0,6),M(0,7),M(0,8),M(0,9),M(0,10),M(0,11),M(0,12),M(0,13),M(0,14),M(0,15),M(0,16),M(0,17),M(0,18),M(0,19),M(0,20),M(0,21),M(0,22),M(0,23),M(0,24),M(0,25),M(0,26),M(0,27),M(0,28),M(0,29),M(0,30),M(0,31),
+M(1,1),M(1,2),M(1,3),M(1,4),M(1,5),M(1,6),M(1,7),M(1,8),M(1,9),M(1,10),M(1,11),M(1,12),M(1,13),M(1,14),M(1,15),M(1,16),M(1,17),M(1,18),M(1,19),M(1,20),M(1,21),M(1,22),M(1,23),M(1,24),M(1,25),M(1,26),M(1,27),M(1,28),M(1,29),
+M(2,1),M(2,2),M(2,3),M(2,4),M(2,5),M(2,6),M(2,7),M(2,8),M(2,9),M(2,10),M(2,11),M(2,12),M(2,13),M(2,14),M(2,15),M(2,16),M(2,17),M(2,18),M(2,19),M(2,20),M(2,21),M(2,22),M(2,23),M(2,24),M(2,25),M(2,26),M(2,27),M(2,28),M(2,29),M(2,30),M(2,31),
+M(3,1),M(3,2),M(3,3),M(3,4),M(3,5),M(3,6),M(3,7),M(3,8),M(3,9),M(3,10),M(3,11),M(3,12),M(3,13),M(3,14),M(3,15),M(3,16),M(3,17),M(3,18),M(3,19),M(3,20),M(3,21),M(3,22),M(3,23),M(3,24),M(3,25),M(3,26),M(3,27),M(3,28),M(3,29),M(3,30),
+M(4,1),M(4,2),M(4,3),M(4,4),M(4,5),M(4,6),M(4,7),M(4,8),M(4,9),M(4,10),M(4,11),M(4,12),M(4,13),M(4,14),M(4,15),M(4,16),M(4,17),M(4,18),M(4,19),M(4,20),M(4,21),M(4,22),M(4,23),M(4,24),M(4,25),M(4,26),M(4,27),M(4,28),M(4,29),M(4,30),M(4,31),
+M(5,1),M(5,2),M(5,3),M(5,4),M(5,5),M(5,6),M(5,7),M(5,8),M(5,9),M(5,10),M(5,11),M(5,12),M(5,13),M(5,14),M(5,15),M(5,16),M(5,17),M(5,18),M(5,19),M(5,20),M(5,21),M(5,22),M(5,23),M(5,24),M(5,25),M(5,26),M(5,27),M(5,28),M(5,29),M(5,30),
+M(6,1),M(6,2),M(6,3),M(6,4),M(6,5),M(6,6),M(6,7),M(6,8),M(6,9),M(6,10),M(6,11),M(6,12),M(6,13),M(6,14),M(6,15),M(6,16),M(6,17),M(6,18),M(6,19),M(6,20),M(6,21),M(6,22),M(6,23),M(6,24),M(6,25),M(6,26),M(6,27),M(6,28),M(6,29),M(6,30),M(6,31),
+M(7,1),M(7,2),M(7,3),M(7,4),M(7,5),M(7,6),M(7,7),M(7,8),M(7,9),M(7,10),M(7,11),M(7,12),M(7,13),M(7,14),M(7,15),M(7,16),M(7,17),M(7,18),M(7,19),M(7,20),M(7,21),M(7,22),M(7,23),M(7,24),M(7,25),M(7,26),M(7,27),M(7,28),M(7,29),M(7,30),M(7,31),
+M(8,1),M(8,2),M(8,3),M(8,4),M(8,5),M(8,6),M(8,7),M(8,8),M(8,9),M(8,10),M(8,11),M(8,12),M(8,13),M(8,14),M(8,15),M(8,16),M(8,17),M(8,18),M(8,19),M(8,20),M(8,21),M(8,22),M(8,23),M(8,24),M(8,25),M(8,26),M(8,27),M(8,28),M(8,29),M(8,30),
+M(9,1),M(9,2),M(9,3),M(9,4),M(9,5),M(9,6),M(9,7),M(9,8),M(9,9),M(9,10),M(9,11),M(9,12),M(9,13),M(9,14),M(9,15),M(9,16),M(9,17),M(9,18),M(9,19),M(9,20),M(9,21),M(9,22),M(9,23),M(9,24),M(9,25),M(9,26),M(9,27),M(9,28),M(9,29),M(9,30),M(9,31),
+M(10,1),M(10,2),M(10,3),M(10,4),M(10,5),M(10,6),M(10,7),M(10,8),M(10,9),M(10,10),M(10,11),M(10,12),M(10,13),M(10,14),M(10,15),M(10,16),M(10,17),M(10,18),M(10,19),M(10,20),M(10,21),M(10,22),M(10,23),M(10,24),M(10,25),M(10,26),M(10,27),M(10,28),M(10,29),M(10,30),
+M(11,1),M(11,2),M(11,3),M(11,4),M(11,5),M(11,6),M(11,7),M(11,8),M(11,9),M(11,10),M(11,11),M(11,12),M(11,13),M(11,14),M(11,15),M(11,16),M(11,17),M(11,18),M(11,19),M(11,20),M(11,21),M(11,22),M(11,23),M(11,24),M(11,25),M(11,26),M(11,27),M(11,28),M(11,29),M(11,30),M(11,31),
+};
+#undef M
+
+enum {
+	ACCUM_JAN = 0,
+	ACCUM_FEB = ACCUM_JAN + 31,
+	ACCUM_MAR = ACCUM_FEB + 29,
+	ACCUM_APR = ACCUM_MAR + 31,
+	ACCUM_MAY = ACCUM_APR + 30,
+	ACCUM_JUN = ACCUM_MAY + 31,
+	ACCUM_JUL = ACCUM_JUN + 30,
+	ACCUM_AUG = ACCUM_JUL + 31,
+	ACCUM_SEP = ACCUM_AUG + 31,
+	ACCUM_OCT = ACCUM_SEP + 30,
+	ACCUM_NOV = ACCUM_OCT + 31,
+	ACCUM_DEC = ACCUM_NOV + 30,
+};
+
+static const uint16 _accum_days_for_month[] = {
+	ACCUM_JAN,ACCUM_FEB,ACCUM_MAR,ACCUM_APR,
+	ACCUM_MAY,ACCUM_JUN,ACCUM_JUL,ACCUM_AUG,
+	ACCUM_SEP,ACCUM_OCT,ACCUM_NOV,ACCUM_DEC,
+};
+
+
+void ConvertDayToYMD(YearMonthDay *ymd, uint16 date)
+{
+	uint yr = date / (365+365+365+366);
+	uint rem = date % (365+365+365+366);
+	uint x;
+
+	yr *= 4;
+
+	if (rem >= 366) {
+		rem--;
+		do {
+			rem -= 365;
+			yr++;
+		} while (rem >= 365);
+		if (rem >= 31+28) rem++;
+	}
+
+	ymd->year = yr;
+		
+	x = _month_date_from_year_day[rem];
+	ymd->month = x >> 5;
+	ymd->day = x & 0x1F;
+}
+
+// year is a number between 0..?
+// month is a number between 0..11
+// day is a number between 1..31
+uint ConvertYMDToDay(uint year, uint month, uint day)
+{
+	uint rem;
+	
+	// day in the year
+	rem = _accum_days_for_month[month] + day - 1;
+
+	// remove feb 29 from year 1,2,3
+	if (year & 3) rem += (year & 3) * 365 + (rem < 31+29);
+
+	// base date.
+	return (year >> 2) * (365+365+365+366) + rem;
+}
+
+// convert a date on the form
+// 1920 - 2090
+// 192001 - 209012
+// 19200101 - 20901231
+// or if > 2090 and below 65536, treat it as a daycount
+// returns -1 if no conversion was possible
+uint ConvertIntDate(uint date)
+{
+	uint year, month = 0, day = 1;
+
+	if (IS_INT_INSIDE(date, 1920, 2090 + 1)) {
+		year = date - 1920;
+	} else if (IS_INT_INSIDE(date, 192001, 209012+1)) {
+		month = date % 100 - 1;	
+		year = date / 100 - 1920;
+	} else if (IS_INT_INSIDE(date, 19200101, 20901231+1)) {
+		day = date % 100; date /= 100;
+		month = date % 100 - 1;	
+		year = date / 100 - 1920;
+	} else if (IS_INT_INSIDE(date, 2091, 65536))
+		return date;
+	else
+		return (uint)-1;
+
+	// invalid ranges?
+	if (month >= 12 || !IS_INT_INSIDE(day, 1, 31+1)) return (uint)-1;
+
+	return ConvertYMDToDay(year, month, day);
+}
+
+typedef struct LandscapePredefVar {
+	StringID names[NUM_CARGO];
+	byte weights[NUM_CARGO];
+	StringID sprites[NUM_CARGO];
+
+	uint16 initial_cargo_payment[NUM_CARGO];
+	byte transit_days_table_1[NUM_CARGO];
+	byte transit_days_table_2[NUM_CARGO];
+
+	byte railwagon_by_cargo[3][NUM_CARGO];
+
+	byte road_veh_by_cargo_start[NUM_CARGO];
+	byte road_veh_by_cargo_count[NUM_CARGO];
+} LandscapePredefVar;
+
+#include "table/landscape_const.h"
+
+
+// Calculate constants that depend on the landscape type.
+void InitializeLandscapeVariables(bool only_constants)
+{
+	const LandscapePredefVar *lpd;
+	int i;
+	StringID str;
+
+	lpd = &_landscape_predef_var[_opt.landscape];
+
+	memcpy(_cargoc.ai_railwagon, lpd->railwagon_by_cargo, sizeof(lpd->railwagon_by_cargo));
+	memcpy(_cargoc.ai_roadveh_start, lpd->road_veh_by_cargo_start,sizeof(lpd->road_veh_by_cargo_start));
+	memcpy(_cargoc.ai_roadveh_count, lpd->road_veh_by_cargo_count,sizeof(lpd->road_veh_by_cargo_count));
+
+	for(i=0; i!=NUM_CARGO; i++) {
+		_cargoc.sprites[i] = lpd->sprites[i];
+		
+		str = lpd->names[i];
+		_cargoc.names_s[i] = str;
+		_cargoc.names_p[i] = (str += 0x20);
+		_cargoc.names_long_s[i] = (str += 0x20);
+		_cargoc.names_long_p[i] = (str += 0x20);
+		_cargoc.names_short[i] = (str += 0x20);
+		_cargoc.weights[i] = lpd->weights[i];
+		
+		if (!only_constants) {
+			_cargo_payment_rates[i] = lpd->initial_cargo_payment[i];
+			_cargo_payment_rates_frac[i] = 0;
+		}
+
+		_cargoc.transit_days_1[i] = lpd->transit_days_table_1[i];
+		_cargoc.transit_days_2[i] = lpd->transit_days_table_2[i];
+	}
+}
+
+// distance in Manhattan metric
+uint GetTileDist(TileIndex xy1, TileIndex xy2)
+{
+	return myabs(GET_TILE_X(xy1) - GET_TILE_X(xy2)) + 
+				myabs(GET_TILE_Y(xy1) - GET_TILE_Y(xy2));
+}
+
+// maximum distance in x _or_ y
+uint GetTileDist1D(TileIndex xy1, TileIndex xy2)
+{
+	return max(myabs(GET_TILE_X(xy1) - GET_TILE_X(xy2)),
+						 myabs(GET_TILE_Y(xy1) - GET_TILE_Y(xy2)));
+}
+
+uint GetTileDist1Db(TileIndex xy1, TileIndex xy2)
+{
+	int a = myabs(GET_TILE_X(xy1) - GET_TILE_X(xy2));
+	int b = myabs(GET_TILE_Y(xy1) - GET_TILE_Y(xy2));
+
+	if (a > b)
+		return a*2+b;
+	else
+		return b*2+a;
+}
+
+uint GetTileDistAdv(TileIndex xy1, TileIndex xy2)
+{
+	uint a = myabs(GET_TILE_X(xy1) - GET_TILE_X(xy2));
+	uint b = myabs(GET_TILE_Y(xy1) - GET_TILE_Y(xy2));
+	return a*a+b*b;
+}
+
+bool CheckDistanceFromEdge(TileIndex tile, uint distance)
+{
+	return IS_INT_INSIDE(GET_TILE_X(tile), distance, TILE_X_MAX + 1 - distance) &&
+			IS_INT_INSIDE(GET_TILE_Y(tile), distance, TILE_Y_MAX + 1 - distance);
+}
+
+void OnNewDay_Train(Vehicle *v);
+void OnNewDay_RoadVeh(Vehicle *v);
+void OnNewDay_Aircraft(Vehicle *v);
+void OnNewDay_Ship(Vehicle *v);
+void OnNewDay_EffectVehicle(Vehicle *v) { /* empty */ }
+void OnNewDay_DisasterVehicle(Vehicle *v);
+
+typedef void OnNewVehicleDayProc(Vehicle *v);
+
+static OnNewVehicleDayProc * _on_new_vehicle_day_proc[] = {
+	OnNewDay_Train,
+	OnNewDay_RoadVeh,
+	OnNewDay_Ship,
+	OnNewDay_Aircraft,
+	OnNewDay_EffectVehicle,
+	OnNewDay_DisasterVehicle,
+};
+
+void EnginesDailyLoop();
+void DisasterDailyLoop();
+void PlayersMonthlyLoop();
+void EnginesMonthlyLoop();
+void TownsMonthlyLoop();
+void IndustryMonthlyLoop();
+void StationMonthlyLoop();
+
+void PlayersYearlyLoop();
+void TrainsYearlyLoop();
+void RoadVehiclesYearlyLoop();
+void AircraftYearlyLoop();
+void ShipsYearlyLoop();
+
+void CheckpointsDailyLoop();
+
+
+static const uint16 _autosave_months[] = {
+	0, // never
+	0xFFF, // every month
+	0x249, // every 3 months
+	0x041, // every 6 months
+	0x001, // every 12 months
+};
+
+void IncreaseDate()
+{
+	int i,ctr,t;
+	YearMonthDay ymd;
+
+	if (_game_mode == GM_MENU) {
+		_tick_counter++;
+		return;
+	}
+
+	/*if the day changed, call the vehicle event but only update a part of the vehicles
+		old max was i!= 12. But with that and a bigger number of vehicles (2560), per day only
+		a part of it could be done, namely: function called max_size date_fract (uint16) / 885 x 12 ==>
+		65536 / 885 = 74; 74x12 = 888. So max 888. Any vehicles above that were not _on_new_vehicle_day_proc'd
+		eg. aged.
+		So new code updates it for max vehicles.
+		(NUM_VEHICLES / maximum number of times ctr is incremented before reset ) + 1 (to get last vehicles too)
+		max size of _date_fract / 885 (added each tick) is number of times before ctr is reset.
+		Calculation might look complicated, but compiler just replaces it with 35, so that's ok
+	*/
+
+	ctr = _vehicle_id_ctr_day;
+	for(i=0; i!=(NUM_VEHICLES / ((1<<sizeof(_date_fract)*8) / 885)) + 1 && ctr != lengthof(_vehicles); i++) {
+		Vehicle *v = &_vehicles[ctr++];
+		if ((t=v->type) != 0)
+			_on_new_vehicle_day_proc[t - 0x10](v);
+	}
+	_vehicle_id_ctr_day = ctr;
+
+	/* increase day, and check if a new day is there? */
+	_tick_counter++;
+	
+	if ( (_date_fract += 885) >= 885)
+		return;
+
+	/* yeah, increse day counter and call various daily loops */
+	_date++;
+
+	_vehicle_id_ctr_day = 0;
+
+	DisasterDailyLoop();
+	CheckpointsDailyLoop();
+
+	if (_game_mode != GM_MENU) {
+		InvalidateWindowWidget(WC_STATUS_BAR, 0, 0);
+		EnginesDailyLoop();
+	}
+
+	/* check if we entered a new month? */
+	ConvertDayToYMD(&ymd, _date);
+	if ((byte)ymd.month == _cur_month)
+		return;
+	_cur_month = ymd.month;
+
+//	printf("Month %d, %X\n", ymd.month, _random_seed_1);
+
+	/* yes, call various monthly loops */
+	if (_game_mode != GM_MENU) {
+		if (HASBIT(_autosave_months[_opt.autosave], _cur_month)) {
+			_do_autosave = true;
+			RedrawAutosave();
+		}
+
+		PlayersMonthlyLoop();
+		EnginesMonthlyLoop();
+		TownsMonthlyLoop();
+		IndustryMonthlyLoop();
+		StationMonthlyLoop();
+	}
+
+	/* check if we entered a new year? */
+	if ((byte)ymd.year == _cur_year)
+		return;
+	_cur_year = ymd.year;
+
+	/* yes, call various yearly loops */ 
+
+	PlayersYearlyLoop();
+	TrainsYearlyLoop();
+	RoadVehiclesYearlyLoop();
+	AircraftYearlyLoop();
+	ShipsYearlyLoop();
+
+	/* check if we reached 2090, that's the maximum year. */
+	if (_cur_year == 171) {
+		_cur_year = 170;
+		_date = 62093;
+	}
+
+	if (_patches.auto_euro)
+		CheckSwitchToEuro();
+
+	/* XXX: check if year 2050 was reached */
+}
+
+int FindFirstBit(uint32 x)
+{
+	int i = 0;
+	assert(x != 0);
+	for(;!(x&1);i++,x>>=1);
+	return i;
+}
+
+
+extern uint SafeTileAdd(uint tile, int add, const char *exp, const char *file, int line)
+{
+	int x = GET_TILE_X(tile) + (signed char)(add & 0xFF);
+	int y = GET_TILE_Y(tile) + ((((0x8080 + add)>>8) & 0xFF) - 0x80);
+
+	if (x < 0 || y < 0 || x >= TILES_X || y >= TILES_Y) {
+		char buf[512];
+
+		sprintf(buf, "TILE_ADD(%s) when adding 0x%.4X and %d failed", exp, tile, add);
+#if !defined(_DEBUG) || !defined(_MSC_VER)
+		printf("%s\n", buf);
+#else
+		_assert(buf, (char*)file, line);
+#endif
+	}
+
+	assert(TILE_XY(x,y) == TILE_MASK(tile + add));
+
+	return TILE_XY(x,y);
+}
+
+static void Save_NAME()
+{
+	int i;
+	byte *b = _name_array[0];
+
+	for(i=0; i!=lengthof(_name_array); i++,b+=sizeof(_name_array[0])) {
+		if (*b) {
+			SlSetArrayIndex(i);
+			SlArray(b, strlen(b), SLE_UINT8);
+		}	
+	}
+}
+
+static void Load_NAME()
+{
+	int index;
+	
+	while ((index = SlIterateArray()) != -1) {
+		SlArray(_name_array[index],SlGetFieldLength(),SLE_UINT8);
+	}
+}
+
+static const byte _game_opt_desc[] = {
+	// added a new difficulty option (town attitude) in version 4
+	SLE_CONDARR(GameOptions,diff,						SLE_FILE_I16 | SLE_VAR_I32, 17, 0, 3),
+	SLE_CONDARR(GameOptions,diff,						SLE_FILE_I16 | SLE_VAR_I32, 18, 4, 255),
+	SLE_VAR(GameOptions,diff_level,			SLE_UINT8),
+	SLE_VAR(GameOptions,currency,				SLE_UINT8),
+	SLE_VAR(GameOptions,kilometers,			SLE_UINT8),
+	SLE_VAR(GameOptions,town_name,			SLE_UINT8),
+	SLE_VAR(GameOptions,landscape,			SLE_UINT8),
+	SLE_VAR(GameOptions,snow_line,			SLE_UINT8),
+	SLE_VAR(GameOptions,autosave,				SLE_UINT8),
+	SLE_VAR(GameOptions,road_side,			SLE_UINT8),
+	SLE_END()
+};
+
+// Save load game options
+static void SaveLoad_OPTS()
+{
+	SlObject(&_opt, _game_opt_desc);	
+}
+
+
+static const SaveLoadGlobVarList _date_desc[] = {
+	{&_date, 										SLE_UINT16, 0, 255},
+	{&_date_fract, 							SLE_UINT16, 0, 255},
+	{&_tick_counter, 						SLE_UINT16, 0, 255},
+	{&_vehicle_id_ctr_day, 			SLE_UINT16, 0, 255},
+	{&_age_cargo_skip_counter, 	SLE_UINT8,	0, 255},
+	{&_avail_aircraft, 					SLE_UINT8,	0, 255},
+	{&_cur_tileloop_tile, 			SLE_UINT16, 0, 255},
+	{&_disaster_delay, 					SLE_UINT16, 0, 255},
+	{&_station_tick_ctr, 				SLE_UINT16, 0, 255},
+	{&_random_seed_1, 					SLE_UINT32, 0, 255},
+	{&_random_seed_2, 					SLE_UINT32, 0, 255},
+	{&_cur_town_ctr, 						SLE_UINT8,	0, 255},
+	{&_cur_player_tick_index, 	SLE_FILE_U8 | SLE_VAR_UINT, 0, 255},
+	{&_next_competitor_start, 	SLE_FILE_U16 | SLE_VAR_UINT, 0, 255},
+	{&_trees_tick_ctr, 					SLE_UINT8,	0, 255},
+	{&_pause, 									SLE_UINT8,	4, 255},
+	{NULL,0}
+};
+
+// Save load date related variables as well as persistent tick counters
+// XXX: currently some unrelated stuff is just put here
+static void SaveLoad_DATE()
+{
+	SlGlobList(_date_desc);
+}
+
+
+static const SaveLoadGlobVarList _view_desc[] = {
+	{&_saved_scrollpos_x, SLE_FILE_I16 | SLE_VAR_INT, 0, 255},
+	{&_saved_scrollpos_y, SLE_FILE_I16 | SLE_VAR_INT, 0, 255},
+	{&_saved_scrollpos_zoom, SLE_UINT8, 0, 255},
+	{NULL,0}
+};
+
+static void SaveLoad_VIEW()
+{
+	SlGlobList(_view_desc);
+}
+
+static void SaveLoad_MAPT() {
+  SlArray(_map_type_and_height, lengthof(_map_type_and_height), SLE_UINT8);
+}
+
+static void SaveLoad_MAP2() {
+  SlArray(_map2, lengthof(_map2), SLE_UINT8);
+}
+
+static void SaveLoad_M3LO() {
+  SlArray(_map3_lo, lengthof(_map3_lo), SLE_UINT8);
+}
+
+static void SaveLoad_M3HI() {
+  SlArray(_map3_hi, lengthof(_map3_hi), SLE_UINT8);
+}
+
+static void SaveLoad_MAPO() {
+  SlArray(_map_owner, lengthof(_map_owner), SLE_UINT8);
+}
+
+static void SaveLoad_MAP5() {
+  SlArray(_map5, lengthof(_map5), SLE_UINT8);
+}
+
+static void SaveLoad_MAPE() {
+  SlArray(_map_extra_bits, lengthof(_map_extra_bits), SLE_UINT8);
+}
+
+
+static void Save_CHTS()
+{
+	byte count = sizeof(_cheats)/sizeof(Cheat);
+	Cheat* cht = (Cheat*) &_cheats;
+	Cheat* cht_last = &cht[count];
+
+	SlSetLength(count*2);
+	for(; cht != cht_last; cht++) {
+		SlWriteByte(cht->been_used);
+		SlWriteByte(cht->value);
+	}
+}
+
+static void Load_CHTS()
+{
+	Cheat* cht = (Cheat*) &_cheats;
+
+	uint count = SlGetFieldLength()/2;
+	for(; count; count--, cht++)
+	{
+		cht->been_used = (byte)SlReadByte();
+		cht->value = (byte)SlReadByte();
+	}
+}
+
+
+const ChunkHandler _misc_chunk_handlers[] = {
+	{ 'MAPT', SaveLoad_MAPT, SaveLoad_MAPT, CH_RIFF },
+	{ 'MAP2', SaveLoad_MAP2, SaveLoad_MAP2, CH_RIFF },
+	{ 'M3LO', SaveLoad_M3LO, SaveLoad_M3LO, CH_RIFF },
+	{ 'M3HI', SaveLoad_M3HI, SaveLoad_M3HI, CH_RIFF },
+	{ 'MAPO', SaveLoad_MAPO, SaveLoad_MAPO, CH_RIFF },
+	{ 'MAP5', SaveLoad_MAP5, SaveLoad_MAP5, CH_RIFF },
+	{ 'MAPE', SaveLoad_MAPE, SaveLoad_MAPE, CH_RIFF },
+
+	{ 'NAME', Save_NAME, Load_NAME, CH_ARRAY},
+	{ 'DATE', SaveLoad_DATE, SaveLoad_DATE, CH_RIFF},
+	{ 'VIEW', SaveLoad_VIEW, SaveLoad_VIEW, CH_RIFF},
+	{ 'OPTS', SaveLoad_OPTS, SaveLoad_OPTS, CH_RIFF},
+	{ 'CHTS', Save_CHTS, Load_CHTS, CH_RIFF | CH_LAST}
+};