(svn r2448) General cleanup of rail related code, more to follow.
* Add: rail.[ch] for rail-related enums and wrapper functions.
* Codechange: Removed dozens of magic numbers with below enums.
* Codechange: Rewrote CheckTrackCombination().
* Add: TILE_SIZE, TILE_PIXELS and TILE_HEIGHT constants.
* Add: enums RailTileType, RailTileSubtype, SignalType to mask against the map arrays.
* Add: enums Track, TrackBits, Trackdir, TrackdirBits for railway track data. (Note that the old RAIL_BIT constants are replaced by TRACK_BIT ones).
* Add: enums Direction and DiagDirection
* Codechange: Moved a bunch of track(dir) related lookup arrays from npf.[ch] to rail.[ch].
* Codechange: move RailType enum from tile.h to rail.h.
* Add: Wrapper functions for masking signal status in the map arrays: SignalAlongTrackdir, SignalAgainstTrackdir and SignalOnTrack.
* Add: Wrapper functions to access rail tiles, using above enums
* Add: Wrapper functions to modify tracks, trackdirs, directions, etc.
* Add: Wrapper functions for all lookup arrays in rail.[ch] (Arrays are still used in parts of the code)
* Codechange: Renamed some variables and arguments to better represent what they contain (railbit -> track, bits -> trackdirbits, etc.).
* Codechange: Don't use FindLandscapeHeight() in CmdRemoveSingleRail(), since it returns way too much info. Use GetTileSlope() instead.
* Codechange: [NPF] Removed some unused globals and code from npf.c.

     1

#ifndef SIGNS_H

     2

#define SIGNS_H

     3

     4

#include "pool.h"

     5

     6

typedef struct SignStruct {

     7

	StringID     str;

     8

	ViewportSign sign;

     9

	int32        x;

    10

	int32        y;

    11

	byte         z;

    12

	byte owner; // placed by this player. Anyone can delete them though.

    13

							// OWNER_NONE for gray signs from old games.

    14

    15

	uint16       index;

    16

} SignStruct;

    17

    18

extern MemoryPool _sign_pool;

    19

    20

/**

    21

 * Check if a Sign really exists.

    22

 */

    23

static inline bool IsValidSign(SignStruct* ss)

    24

{

    25

	return ss->str != 0;

    26

}

    27

    28

/**

    29

 * Get the pointer to the sign with index 'index'

    30

 */

    31

static inline SignStruct *GetSign(uint index)

    32

{

    33

	return (SignStruct*)GetItemFromPool(&_sign_pool, index);

    34

}

    35

    36

/**

    37

 * Get the current size of the SignPool

    38

 */

    39

static inline uint16 GetSignPoolSize(void)

    40

{

    41

	return _sign_pool.total_items;

    42

}

    43

    44

static inline bool IsSignIndex(uint index)

    45

{

    46

	return index < GetSignPoolSize();

    47

}

    48

    49

#define FOR_ALL_SIGNS_FROM(ss, start) for (ss = GetSign(start); ss != NULL; ss = (ss->index + 1 < GetSignPoolSize()) ? GetSign(ss->index + 1) : NULL)

    50

#define FOR_ALL_SIGNS(ss) FOR_ALL_SIGNS_FROM(ss, 0)

    51

    52

VARDEF SignStruct *_new_sign_struct;

    53

    54

VARDEF bool _sign_sort_dirty;

    55

VARDEF uint16 *_sign_sort;

    56

    57

void UpdateAllSignVirtCoords(void);

    58

void PlaceProc_Sign(uint tile);

    59

    60

/* misc.c */

    61

void ShowRenameSignWindow(SignStruct *ss);

    62

    63

#endif /* SIGNS_H */