OpenTTD-patches/airport.h

#ifndef AIRPORT_H
#define AIRPORT_H

#include "airport_movement.h"

enum {MAX_TERMINALS = 6};
enum {MAX_HELIPADS  = 2};

// Airport types
enum {
	AT_SMALL = 0,
	AT_LARGE = 1,
	AT_HELIPORT = 2,
	AT_METROPOLITAN = 3,
	AT_INTERNATIONAL = 4,
	AT_OILRIG = 5
};

// do not change unless you change v->subtype too. This aligns perfectly with its current setting
enum {
	AIRCRAFT_ONLY = 0,
	ALL = 1,
	HELICOPTERS_ONLY = 2
};

// Finite sTate mAchine --> FTA
typedef struct AirportFTAClass {
	byte nofelements;						// number of positions the airport consists of
	byte nofterminals;					// number of terminals this airport has
	byte nofterminalgroups;			// terminals belong to so many groups (MAX is the nofterminals)
	byte nofhelipads;						// number of helipads this airport has
	byte nofhelipadgroups;			// helipads belong to so many groups (MAX is the nofhelipads)
	byte entry_point;						// when an airplane arrives at this airport, enter it at position entry_point
	byte acc_planes;						// accept airplanes or helicopters or both
	uint16 *airport_depots;			// gives the position of the depots on the airports
	struct AirportFTA *layout;	// state machine for airport
} AirportFTAClass;

// internal structure used in openttd - Finite sTate mAchine --> FTA
typedef struct AirportFTA {
	byte position;										// the position that an airplane is at
	byte next_position;								// next position from this position
	uint32 block;	// 32 bit blocks (st->airport_flags), should be enough for the most complex airports
	byte heading;	// heading (current orders), guiding an airplane to its target on an airport
	struct AirportFTA *next_in_chain;	// possible extra movement choices from this position
} AirportFTA;

void InitializeAirports();
void UnInitializeAirports();
const AirportFTAClass* GetAirport(const byte airport_type);

#endif /* AIRPORT_H */