tron@2186: /* $Id$ */
tron@2186: 
truelight@0: #include "stdafx.h"
Darkvater@1891: #include "openttd.h"
tron@1299: #include "debug.h"
tron@679: #include "map.h"
truelight@0: #include "airport.h"
tron@2159: #include "macros.h"
tron@2159: #include "variables.h"
peter1138@3701: #include "airport_movement.h"
rubidium@4261: #include "date.h"
truelight@0: 
Darkvater@4843: /* Uncomment this to print out a full report of the airport-structure
Darkvater@4843:  * You should either use
Darkvater@4843:  * - true: full-report, print out every state and choice with string-names
Darkvater@4843:  * OR
Darkvater@4843:  * - false: give a summarized report which only shows current and next position */
Darkvater@4843: //#define DEBUG_AIRPORT false
Darkvater@4843: 
belugas@4171: static AirportFTAClass *CountryAirport;
belugas@4171: static AirportFTAClass *CityAirport;
belugas@4171: static AirportFTAClass *Oilrig;
belugas@4171: static AirportFTAClass *Heliport;
belugas@4171: static AirportFTAClass *MetropolitanAirport;
belugas@4171: static AirportFTAClass *InternationalAirport;
belugas@4171: static AirportFTAClass *CommuterAirport;
belugas@4171: static AirportFTAClass *HeliDepot;
belugas@4171: static AirportFTAClass *IntercontinentalAirport;
belugas@4171: static AirportFTAClass *HeliStation;
truelight@0: 
Darkvater@4842: static void AirportFTAClass_Constructor(AirportFTAClass *apc,
richk@4059: 	const byte *terminals, const byte *helipads,
richk@4059: 	const byte entry_point,  const byte acc_planes,
Darkvater@4842: 	const AirportFTAbuildup *apFA,
richk@4059: 	const TileIndexDiffC *depots, const byte nof_depots,
tron@3876: 	uint size_x, uint size_y
tron@3876: );
Darkvater@4842: static void AirportFTAClass_Destructor(AirportFTAClass *apc);
truelight@0: 
Darkvater@4842: static uint16 AirportGetNofElements(const AirportFTAbuildup *apFA);
Darkvater@4842: static void AirportBuildAutomata(AirportFTAClass *apc, const AirportFTAbuildup *apFA);
Darkvater@4843: static byte AirportGetTerminalCount(const byte *terminals, byte *groups);
Darkvater@4842: static byte AirportTestFTA(const AirportFTAClass *apc);
Darkvater@4843: 
Darkvater@4843: #ifdef DEBUG_AIRPORT
Darkvater@4843: static void AirportPrintOut(const AirportFTAClass *apc, bool full_report);
Darkvater@4843: #endif /* DEBUG_AIRPORT */
truelight@0: 
tron@1093: void InitializeAirports(void)
truelight@0: {
truelight@0: 	// country airport
celestar@950: 	CountryAirport = malloc(sizeof(AirportFTAClass));
tron@1019: 
celestar@950: 	AirportFTAClass_Constructor(
tron@1019: 		CountryAirport,
tron@1019: 		_airport_terminal_country,
tron@1019: 		NULL,
tron@1019: 		16,
tron@1019: 		ALL,
tron@1019: 		_airport_fta_country,
tron@1019: 		_airport_depots_country,
tron@3876: 		lengthof(_airport_depots_country),
tron@3876: 		4, 3
celestar@950: 	);
truelight@0: 
truelight@0: 	// city airport
celestar@950: 	CityAirport = malloc(sizeof(AirportFTAClass));
tron@1019: 
celestar@950: 	AirportFTAClass_Constructor(
tron@1019: 		CityAirport,
tron@1019: 		_airport_terminal_city,
tron@1019: 		NULL,
tron@1019: 		19,
tron@1019: 		ALL,
tron@1019: 		_airport_fta_city,
tron@1019: 		_airport_depots_city,
tron@3876: 		lengthof(_airport_depots_city),
tron@3876: 		6, 6
celestar@950: 	);
truelight@0: 
truelight@0: 	// metropolitan airport
celestar@950: 	MetropolitanAirport = malloc(sizeof(AirportFTAClass));
tron@1019: 
celestar@950: 	AirportFTAClass_Constructor(
tron@1019: 		MetropolitanAirport,
tron@1019: 		_airport_terminal_metropolitan,
tron@1019: 		NULL,
tron@1019: 		20,
tron@1019: 		ALL,
tron@1019: 		_airport_fta_metropolitan,
tron@1019: 		_airport_depots_metropolitan,
tron@3876: 		lengthof(_airport_depots_metropolitan),
tron@3876: 		6, 6
celestar@950: 	);
truelight@0: 
truelight@0: 	// international airport
truelight@0: 	InternationalAirport = (AirportFTAClass *)malloc(sizeof(AirportFTAClass));
tron@1019: 
celestar@950: 	AirportFTAClass_Constructor(
tron@1019: 		InternationalAirport,
tron@1019: 		_airport_terminal_international,
tron@1019: 		_airport_helipad_international,
tron@1019: 		37,
tron@1019: 		ALL,
tron@1019: 		_airport_fta_international,
tron@1019: 		_airport_depots_international,
tron@3876: 		lengthof(_airport_depots_international),
tron@3876: 		7, 7
celestar@950: 	);
truelight@0: 
richk@4059: 	// intercontintental airport
richk@4059: 	IntercontinentalAirport = (AirportFTAClass *)malloc(sizeof(AirportFTAClass));
richk@4059: 
richk@4059: 	AirportFTAClass_Constructor(
richk@4059: 		IntercontinentalAirport,
richk@4059: 		_airport_terminal_intercontinental,
richk@4059: 		_airport_helipad_intercontinental,
richk@4059: 		43,
richk@4059: 		ALL,
richk@4059: 		_airport_fta_intercontinental,
richk@4059: 		_airport_depots_intercontinental,
richk@4059: 		lengthof(_airport_depots_intercontinental),
richk@4059: 		9,11
richk@4059: 	);
richk@4059: 
truelight@0: 	// heliport, oilrig
truelight@0: 	Heliport = (AirportFTAClass *)malloc(sizeof(AirportFTAClass));
tron@1019: 
celestar@950: 	AirportFTAClass_Constructor(
tron@1019: 		Heliport,
tron@1019: 		NULL,
tron@1019: 		_airport_helipad_heliport_oilrig,
tron@1019: 		7,
tron@1019: 		HELICOPTERS_ONLY,
tron@1019: 		_airport_fta_heliport_oilrig,
tron@1019: 		NULL,
tron@3876: 		0,
tron@3876: 		1, 1
celestar@950: 	);
tron@1019: 
truelight@0: 	Oilrig = Heliport;  // exactly the same structure for heliport/oilrig, so share state machine
richk@4059: 
richk@4059: 	// commuter airport
richk@4059: 	CommuterAirport = malloc(sizeof(AirportFTAClass));
richk@4059: 
richk@4059: 	AirportFTAClass_Constructor(
richk@4059: 		CommuterAirport,
richk@4059: 		_airport_terminal_commuter,
richk@4059: 		_airport_helipad_commuter,
richk@4059: 		22,
richk@4059: 		ALL,
richk@4059: 		_airport_fta_commuter,
richk@4059: 		_airport_depots_commuter,
richk@4059: 		lengthof(_airport_depots_commuter),
richk@4059: 		5,4
richk@4059: 	);
richk@4059: 
richk@4059: 	// helidepot airport
richk@4059: 	HeliDepot = malloc(sizeof(AirportFTAClass));
richk@4059: 
richk@4059: 	AirportFTAClass_Constructor(
richk@4059: 		HeliDepot,
richk@4059: 		NULL,
richk@4059: 		_airport_helipad_helidepot,
richk@4059: 		4,
richk@4059: 		HELICOPTERS_ONLY,
richk@4059: 		_airport_fta_helidepot,
richk@4059: 		_airport_depots_helidepot,
richk@4059: 		lengthof(_airport_depots_helidepot),
richk@4059: 		2,2
richk@4059: 	);
richk@4059: 
richk@4059: 	// helistation airport
richk@4059: 	HeliStation = malloc(sizeof(AirportFTAClass));
richk@4059: 
richk@4059: 	AirportFTAClass_Constructor(
richk@4059: 		HeliStation,
richk@4059: 		NULL,
richk@4059: 		_airport_helipad_helistation,
richk@4059: 		25,
richk@4059: 		HELICOPTERS_ONLY,
richk@4059: 		_airport_fta_helistation,
richk@4059: 		_airport_depots_helistation,
richk@4059: 		lengthof(_airport_depots_helistation),
richk@4059: 		4,2
richk@4059: 	);
richk@4059: 
truelight@0: }
truelight@0: 
tron@1093: void UnInitializeAirports(void)
truelight@0: {
truelight@0: 	AirportFTAClass_Destructor(CountryAirport);
truelight@0: 	AirportFTAClass_Destructor(CityAirport);
truelight@0: 	AirportFTAClass_Destructor(Heliport);
truelight@0: 	AirportFTAClass_Destructor(MetropolitanAirport);
truelight@0: 	AirportFTAClass_Destructor(InternationalAirport);
richk@4059: 	AirportFTAClass_Destructor(CommuterAirport);
richk@4059: 	AirportFTAClass_Destructor(HeliDepot);
richk@4059: 	AirportFTAClass_Destructor(IntercontinentalAirport);
richk@4059: 	AirportFTAClass_Destructor(HeliStation);
truelight@0: }
truelight@0: 
Darkvater@4842: static void AirportFTAClass_Constructor(AirportFTAClass *apc,
Darkvater@4842: 	const byte *terminals, const byte *helipads,
Darkvater@4842: 	const byte entry_point, const byte acc_planes,
Darkvater@4842: 	const AirportFTAbuildup *apFA,
Darkvater@4842: 	const TileIndexDiffC *depots, const byte nof_depots,
tron@3876: 	uint size_x, uint size_y
tron@3876: )
truelight@0: {
celestar@950: 	byte nofterminals, nofhelipads;
Darkvater@4843: 	byte nofterminalgroups, nofhelipadgroups;
tron@1019: 
Darkvater@4842: 	apc->size_x = size_x;
Darkvater@4842: 	apc->size_y = size_y;
tron@3876: 
Darkvater@4843: 	/* Set up the terminal and helipad count for an airport.
Darkvater@4843: 	 * TODO: If there are more than 10 terminals or 4 helipads, internal variables
Darkvater@4843: 	 * need to be changed, so don't allow that for now */
Darkvater@4843: 	nofterminals = AirportGetTerminalCount(terminals, &nofterminalgroups);
Darkvater@4843: 	if (nofterminals > MAX_TERMINALS) {
Darkvater@4843: 		DEBUG(misc, 0) ("[Ap] Currently only maximum of %d terminals are supported (you wanted %d)", MAX_TERMINALS, nofterminals);
Darkvater@4843: 		assert(nofterminals <= MAX_TERMINALS);
celestar@950: 	}
Darkvater@4842: 	apc->terminals = terminals;
celestar@950: 
Darkvater@4843: 	nofhelipads = AirportGetTerminalCount(helipads, &nofhelipadgroups);
Darkvater@4843: 	if (nofhelipads > MAX_HELIPADS) {
Darkvater@4843: 		DEBUG(misc, 0) ("[Ap] Currently only maximum of %d helipads are supported (you wanted %d)", MAX_HELIPADS, nofhelipads);
Darkvater@4843: 		assert(nofhelipads <= MAX_HELIPADS);
celestar@950: 	}
Darkvater@4842: 	apc->helipads = helipads;
celestar@950: 
Darkvater@4843: 	/* Get the number of elements from the source table. We also double check this
Darkvater@4843: 	 * with the entry point which must be within bounds and use this information
Darkvater@4843: 	 * later on to build and validate the state machine */
Darkvater@4842: 	apc->nofelements = AirportGetNofElements(apFA);
Darkvater@4843: 	if (entry_point >= apc->nofelements) {
Darkvater@4843: 		DEBUG(misc, 0) ("[Ap] Entry (%d) must be within the airport (maximum %d)", entry_point, apc->nofelements);
Darkvater@4843: 		assert(entry_point < apc->nofelements);
Darkvater@4843: 	}
truelight@0: 
Darkvater@4843: 	apc->acc_planes     = acc_planes;
Darkvater@4843: 	apc->entry_point    = entry_point;
Darkvater@4842: 	apc->airport_depots = depots;
Darkvater@4843: 	apc->nof_depots     = nof_depots;
truelight@0: 
Darkvater@4843: 	/* Build the state machine itself */
Darkvater@4842: 	AirportBuildAutomata(apc, apFA);
Darkvater@4843: 	DEBUG(misc, 1) ("[Ap] #count %3d; #term %2d (%dgrp); #helipad %2d (%dgrp); entry %3d",
Darkvater@4843: 		apc->nofelements, nofterminals, nofterminalgroups, nofhelipads, nofhelipadgroups, apc->entry_point);
truelight@0: 
Darkvater@4843: 	/* Test if everything went allright. This is only a rude static test checking
Darkvater@4843: 	 * the symantic correctness. By no means does passing the test mean that the
Darkvater@4843: 	 * airport is working correctly or will not deadlock for example */
Darkvater@4843: 	{ byte ret = AirportTestFTA(apc);
Darkvater@4843: 		if (ret != MAX_ELEMENTS) DEBUG(misc, 0) ("[Ap] ERROR with element: %d", ret - 1);
tron@2549: 		assert(ret == MAX_ELEMENTS);
truelight@0: 	}
Darkvater@4843: 
Darkvater@4843: #ifdef DEBUG_AIRPORT
Darkvater@4843: 	AirportPrintOut(apc, DEBUG_AIRPORT);
tron@4077: #endif
truelight@0: }
truelight@0: 
Darkvater@4842: static void AirportFTAClass_Destructor(AirportFTAClass *apc)
truelight@0: {
truelight@0: 	int i;
truelight@0: 	AirportFTA *current, *next;
truelight@0: 
Darkvater@4842: 	for (i = 0; i < apc->nofelements; i++) {
Darkvater@4842: 		current = apc->layout[i].next;
truelight@0: 		while (current != NULL) {
Darkvater@4842: 			next = current->next;
truelight@0: 			free(current);
truelight@0: 			current = next;
truelight@0: 		};
truelight@0: 	}
Darkvater@4842: 	free(apc->layout);
Darkvater@4842: 	free(apc);
truelight@0: }
truelight@0: 
Darkvater@4843: /** Get the number of elements of a source Airport state automata
Darkvater@4843:  * Since it is actually just a big array of AirportFTA types, we only
Darkvater@4843:  * know one element from the other by differing 'position' identifiers */
Darkvater@4842: static uint16 AirportGetNofElements(const AirportFTAbuildup *apFA)
truelight@0: {
truelight@0: 	int i;
truelight@0: 	uint16 nofelements = 0;
Darkvater@4842: 	int temp = apFA[0].position;
tron@2549: 
truelight@0: 	for (i = 0; i < MAX_ELEMENTS; i++) {
Darkvater@4842: 		if (temp != apFA[i].position) {
truelight@0: 			nofelements++;
Darkvater@4842: 			temp = apFA[i].position;
truelight@0: 		}
Darkvater@4842: 		if (apFA[i].position == MAX_ELEMENTS) break;
truelight@0: 	}
truelight@0: 	return nofelements;
truelight@0: }
truelight@0: 
Darkvater@4843: /* We calculate the terminal/helipod count based on the data passed to us
Darkvater@4843:  * This data (terminals) contains an index as a first element as to how many
Darkvater@4843:  * groups there are, and then the number of terminals for each group */
Darkvater@4843: static byte AirportGetTerminalCount(const byte *terminals, byte *groups)
Darkvater@4843: {
Darkvater@4843: 	byte i;
Darkvater@4843: 	byte nof_terminals = 0;
Darkvater@4843: 	*groups = 0;
Darkvater@4843: 
Darkvater@4843: 	if (terminals != NULL) {
Darkvater@4843: 		i = terminals[0];
Darkvater@4843: 		*groups = i;
Darkvater@4843: 		while (i-- > 0) {
Darkvater@4843: 			terminals++;
Darkvater@4843: 			assert(*terminals != 0); // no empty groups please
Darkvater@4843: 			nof_terminals += *terminals;
Darkvater@4843: 		}
Darkvater@4843: 	}
Darkvater@4843: 	return nof_terminals;
Darkvater@4843: }
Darkvater@4843: 
Darkvater@4842: static void AirportBuildAutomata(AirportFTAClass *apc, const AirportFTAbuildup *apFA)
truelight@0: {
truelight@0: 	AirportFTA *current;
Darkvater@4843: 	AirportFTA *FAutomata = malloc(sizeof(AirportFTA) * apc->nofelements);
Darkvater@4843: 	uint16 internalcounter = 0;
Darkvater@4843: 	uint16 i;
Darkvater@4843: 
Darkvater@4842: 	apc->layout = FAutomata;
Darkvater@4842: 	for (i = 0; i < apc->nofelements; i++) {
Darkvater@4842: 		current = &apc->layout[i];
Darkvater@4843: 		current->position      = apFA[internalcounter].position;
Darkvater@4843: 		current->heading       = apFA[internalcounter].heading;
Darkvater@4843: 		current->block         = apFA[internalcounter].block;
Darkvater@4842: 		current->next_position = apFA[internalcounter].next;
truelight@0: 
truelight@0: 		// outgoing nodes from the same position, create linked list
Darkvater@4842: 		while (current->position == apFA[internalcounter + 1].position) {
belugas@4171: 			AirportFTA *newNode = malloc(sizeof(AirportFTA));
tron@2549: 
Darkvater@4843: 			newNode->position      = apFA[internalcounter + 1].position;
Darkvater@4843: 			newNode->heading       = apFA[internalcounter + 1].heading;
Darkvater@4843: 			newNode->block         = apFA[internalcounter + 1].block;
Darkvater@4842: 			newNode->next_position = apFA[internalcounter + 1].next;
truelight@0: 			// create link
Darkvater@4842: 			current->next = newNode;
Darkvater@4842: 			current = current->next;
truelight@0: 			internalcounter++;
truelight@0: 		} // while
Darkvater@4842: 		current->next = NULL;
truelight@0: 		internalcounter++;
truelight@0: 	}
truelight@0: }
truelight@0: 
Darkvater@4842: static byte AirportTestFTA(const AirportFTAClass *apc)
truelight@0: {
Darkvater@4843: 	byte position, i, next_position;
Darkvater@4844: 	AirportFTA *current, *first;
Darkvater@4843: 	next_position = 0;
truelight@0: 
Darkvater@4842: 	for (i = 0; i < apc->nofelements; i++) {
Darkvater@4842: 		position = apc->layout[i].position;
Darkvater@4843: 		if (position != next_position) return i;
Darkvater@4844: 		current = first = &apc->layout[i];
truelight@0: 
Darkvater@4844: 		for (; current != NULL; current = current->next) {
Darkvater@4844: 			/* A heading must always be valid. The only exceptions are
Darkvater@4844: 			 * - multiple choices as start, identified by a special value of 255
Darkvater@4844: 			 * - terminal group which is identified by a special value of 255 */
Darkvater@4844: 			if (current->heading > MAX_HEADINGS) {
Darkvater@4844: 				if (current->heading != 255) return i;
Darkvater@4844: 				if (current == first && current->next == NULL) return i;
Darkvater@4844: 				if (current != first && current->next_position > apc->terminals[0]) return i;
Darkvater@4844: 			}
Darkvater@4844: 
Darkvater@4844: 			/* If there is only one choice, it must be at the end */
Darkvater@4844: 			if (current->heading == 0 && current->next != NULL) return i;
Darkvater@4844: 			/* Obviously the elements of the linked list must have the same identifier */
Darkvater@4843: 			if (position != current->position) return i;
Darkvater@4844: 			/* A next position must be within bounds */
Darkvater@4843: 			if (current->next_position >= apc->nofelements) return i;
Darkvater@4844: 		}
Darkvater@4843: 		next_position++;
truelight@0: 	}
truelight@0: 	return MAX_ELEMENTS;
truelight@0: }
truelight@0: 
Darkvater@4843: #ifdef DEBUG_AIRPORT
tron@2549: static const char* const _airport_heading_strings[] = {
truelight@0: 	"TO_ALL",
truelight@0: 	"HANGAR",
truelight@0: 	"TERM1",
truelight@0: 	"TERM2",
truelight@0: 	"TERM3",
truelight@0: 	"TERM4",
truelight@0: 	"TERM5",
truelight@0: 	"TERM6",
truelight@0: 	"HELIPAD1",
truelight@0: 	"HELIPAD2",
truelight@0: 	"TAKEOFF",
truelight@0: 	"STARTTAKEOFF",
truelight@0: 	"ENDTAKEOFF",
truelight@0: 	"HELITAKEOFF",
truelight@0: 	"FLYING",
truelight@0: 	"LANDING",
truelight@0: 	"ENDLANDING",
truelight@0: 	"HELILANDING",
truelight@0: 	"HELIENDLANDING",
richk@4059: 	"TERM7",
richk@4059: 	"TERM8",
richk@4059: 	"HELIPAD3",
richk@4059: 	"HELIPAD4",
rubidium@4434: 	"DUMMY" // extra heading for 255
truelight@0: };
truelight@0: 
tron@4077: static uint AirportBlockToString(uint32 block)
tron@4077: {
tron@4077: 	uint i = 0;
tron@4077: 	if (block & 0xffff0000) { block >>= 16; i += 16; }
tron@4077: 	if (block & 0x0000ff00) { block >>=  8; i +=  8; }
tron@4077: 	if (block & 0x000000f0) { block >>=  4; i +=  4; }
tron@4077: 	if (block & 0x0000000c) { block >>=  2; i +=  2; }
tron@4077: 	if (block & 0x00000002) { i += 1; }
tron@4077: 	return i;
tron@4077: }
tron@4077: 
Darkvater@4843: static void AirportPrintOut(const AirportFTAClass *apc, bool full_report)
truelight@0: {
Darkvater@4843: 	uint16 i;
tron@4077: 
Darkvater@4843: 	if (!full_report) printf("(P = Current Position; NP = Next Position)\n");
Darkvater@4843: 
Darkvater@4843: 	for (i = 0; i < apc->nofelements; i++) {
Darkvater@4843: 		AirportFTA *current = &apc->layout[i];
Darkvater@4843: 
Darkvater@4843: 		for (; current != NULL; current = current->next) {
truelight@0: 			if (full_report) {
Darkvater@4843: 				byte heading = (current->heading == 255) ? MAX_HEADINGS + 1 : current->heading;
Darkvater@4843: 				printf("\tPos:%2d NPos:%2d Heading:%15s Block:%2d\n", current->position,
Darkvater@4843: 					    current->next_position, _airport_heading_strings[heading],
Darkvater@4843: 							AirportBlockToString(current->block));
tron@2549: 			} else {
Darkvater@4843: 				printf("P:%2d NP:%2d", current->position, current->next_position);
truelight@0: 			}
truelight@0: 		}
truelight@0: 		printf("\n");
truelight@0: 	}
truelight@0: }
tron@2549: #endif
truelight@0: 
belugas@4171: const AirportFTAClass *GetAirport(const byte airport_type)
truelight@0: {
truelight@0: 	//FIXME -- AircraftNextAirportPos_and_Order -> Needs something nicer, don't like this code
truelight@0: 	// needs constant change if more airports are added
truelight@0: 	switch (airport_type) {
tron@4077: 		default:               NOT_REACHED();
tron@4077: 		case AT_SMALL:         return CountryAirport;
tron@4077: 		case AT_LARGE:         return CityAirport;
tron@4077: 		case AT_METROPOLITAN:  return MetropolitanAirport;
tron@4077: 		case AT_HELIPORT:      return Heliport;
tron@4077: 		case AT_OILRIG:        return Oilrig;
tron@4077: 		case AT_INTERNATIONAL: return InternationalAirport;
tron@4077: 		case AT_COMMUTER:      return CommuterAirport;
tron@4077: 		case AT_HELIDEPOT:     return HeliDepot;
tron@4077: 		case AT_INTERCON:      return IntercontinentalAirport;
tron@4077: 		case AT_HELISTATION:   return HeliStation;
truelight@0: 	}
truelight@0: }
tron@2159: 
peter1138@3701: const AirportMovingData *GetAirportMovingData(byte airport_type, byte position)
peter1138@3701: {
peter1138@3701: 	assert(airport_type < lengthof(_airport_moving_datas));
peter1138@3701: 	assert(position < GetAirport(airport_type)->nofelements);
peter1138@3701: 	return &_airport_moving_datas[airport_type][position];
peter1138@3701: }
peter1138@3701: 
tron@2159: uint32 GetValidAirports(void)
tron@2159: {
tron@2159: 	uint32 bytemask = _avail_aircraft; /// sets the first 3 bytes, 0 - 2, @see AdjustAvailAircraft()
tron@2159: 
Darkvater@4843: 	if (_cur_year >= 1980) SETBIT(bytemask, 3); // metropolitan airport
rubidium@4294: 	if (_cur_year >= 1990) SETBIT(bytemask, 4); // international airport
rubidium@4294: 	if (_cur_year >= 1983) SETBIT(bytemask, 5); // commuter airport
rubidium@4294: 	if (_cur_year >= 1976) SETBIT(bytemask, 6); // helidepot
rubidium@4294: 	if (_cur_year >= 2002) SETBIT(bytemask, 7); // intercontinental airport
rubidium@4294: 	if (_cur_year >= 1980) SETBIT(bytemask, 8); // helistation
tron@2159: 	return bytemask;
tron@2159: }