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(svn r4351) Simplify ReverseTrackdir() to use a simple arithmetic operation instead of a table lookup

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tron 2006-04-11 04:49:23 +00:00
parent f1da549c10
commit d38964e49a
2 changed files with 1 additions and 6 deletions
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4
rail.c
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@ -101,10 +101,6 @@ const Trackdir _dir_to_diag_trackdir[] = {
TRACKDIR_X_NE, TRACKDIR_Y_SE, TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE, TRACKDIR_X_SW, TRACKDIR_Y_NW,
}; };
const Trackdir _reverse_trackdir[] = {
TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_UPPER_W, TRACKDIR_LOWER_W, TRACKDIR_LEFT_N, TRACKDIR_RIGHT_N, INVALID_TRACKDIR, INVALID_TRACKDIR,
TRACKDIR_X_NE, TRACKDIR_Y_SE, TRACKDIR_UPPER_E, TRACKDIR_LOWER_E, TRACKDIR_LEFT_S, TRACKDIR_RIGHT_S
};
RailType GetTileRailType(TileIndex tile, Trackdir trackdir) RailType GetTileRailType(TileIndex tile, Trackdir trackdir)
{ {

3
rail.h
View File

@ -238,8 +238,7 @@ static inline bool HasTrack(TileIndex tile, Track track)
* Maps a trackdir to the reverse trackdir. * Maps a trackdir to the reverse trackdir.
*/ */
static inline Trackdir ReverseTrackdir(Trackdir trackdir) { static inline Trackdir ReverseTrackdir(Trackdir trackdir) {
extern const Trackdir _reverse_trackdir[TRACKDIR_END]; return (Trackdir)(trackdir ^ 8);
return _reverse_trackdir[trackdir];
} }
/** /**