(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.
static const SpriteID _engine_sprite_base[] = {
0x0B59, 0x0B61, 0x0B69, 0x0BE1, 0x0B71, 0x0B75, 0x0B7D, 0x0B7D,
0x0B85, 0x0B85, 0x0B8D, 0x0B8D, 0x0BC9, 0x0BD1, 0x0BD9, 0x0BE9,
0x0BED, 0x0BED, 0x0BF5, 0x0BF9, 0x0B79, 0x0B9D, 0x0B9D, 0x0B95,
0x0B95, 0x0BA5, 0x0BA9, 0x0BA9, 0x0BC1, 0x0BC5, 0x0BB1, 0x0BB9,
0x0BB9, 0x0AAD, 0x0AB1, 0x0AB5, 0x0AB9, 0x0ABD, 0x0AC1, 0x0AC9,
0x0ACD, 0x0AD5, 0x0AD1, 0x0AD9, 0x0AC5, 0x0AD1, 0x0AD5, 0x0AF9,
0x0AFD, 0x0B05, 0x0AB9, 0x0AC1, 0x0AC9, 0x0AD1, 0x0AD9, 0x0AE1,
0x0AE5, 0x0AE9, 0x0AF1, 0x0AF9, 0x0B0D, 0x0B11, 0x0B15, 0x0B19,
0x0B1D, 0x0B21, 0x0B29, 0x0B2D, 0x0B35, 0x0B31, 0x0B39, 0x0B25,
0x0B31, 0x0B35,
};
/* For how many directions do we have sprites? (8 or 4; if 4, the other 4
* directions are symmetric. */
static const byte _engine_sprite_and[] = {
7, 7, 7, 7, 3, 3, 7, 7,
7, 7, 7, 7, 7, 7, 7, 3,
7, 7, 3, 7, 3, 7, 7, 7,
7, 3, 7, 7, 3, 3, 7, 7,
7, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3,
3, 3,
};
/* Non-zero for multihead trains. */
static const byte _engine_sprite_add[] = {
0, 0, 0, 0, 0, 0, 0, 4,
0, 4, 0, 4, 0, 0, 0, 0,
0, 4, 0, 0, 0, 0, 4, 0,
4, 0, 0, 4, 0, 0, 0, 0,
4, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0,
};
static const byte _wagon_full_adder[] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 44, 0, 0, 0, 0, 24,
24, 24, 24, 0, 0, 32, 32, 0,
4, 4, 4, 4, 4, 4, 4, 0,
0, 4, 4, 4, 0, 44, 0, 0,
0, 0, 24, 24, 24, 24, 0, 0,
32, 32
};