(svn r1696) Use GetTileSlope() instead of FindLandscapeHeightByTile() where it is sufficient. FindLandscapeHeightByTile() uses GetTileSlope() internally and adds some more info, which is discarded in these cases.
While touching the code make a bit more clear how GetBridgeHeight() works.
#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 = 15
};
// 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
const byte *terminals;
const byte *helipads;
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
const TileIndexDiffC *airport_depots; // gives the position of the depots on the airports
byte nof_depots; // number of depots this airport has
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);
void UnInitializeAirports(void);
const AirportFTAClass* GetAirport(const byte airport_type);
#endif /* AIRPORT_H */