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(svn r13929) -Codechange [YAPP]: Reserving and unreserving of single tracks is now possible. (michi_cc)

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rubidium
2008-08-02 22:48:01 +00:00
parent 2bb8825538
commit f6555cf6f8
3 changed files with 166 additions and 1 deletions
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33
src/rail_map.h
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@@ -256,6 +256,39 @@ static inline void SetTrackReservation(TileIndex t, TrackBits b)
SB(_m[t].m2, 11, 1, (byte)(b != TRACK_BIT_NONE));
}
/**
* Try to reserve a specific track on a tile
* @pre IsPlainRailTile(t) && HasTrack(tile, t)
* @param tile the tile
* @param t the rack to reserve
* @return true if successful
*/
static inline bool TryReserveTrack(TileIndex tile, Track t)
{
assert(HasTrack(tile, t));
TrackBits bits = TrackToTrackBits(t);
TrackBits res = GetTrackReservation(tile);
if ((res & bits) != TRACK_BIT_NONE) return false; // already reserved
res |= bits;
if (TracksOverlap(res)) return false; // crossing reservation present
SetTrackReservation(tile, res);
return true;
}
/**
* Lift the reservation of a specific track on a tile
* @pre IsPlainRailTile(t) && HasTrack(tile, t)
* @param tile the tile
* @param t the track to free
*/
static inline void UnreserveTrack(TileIndex tile, Track t)
{
assert(HasTrack(tile, t));
TrackBits res = GetTrackReservation(tile);
res &= ~TrackToTrackBits(t);
SetTrackReservation(tile, res);
}
/**
* Get the reservation state of the waypoint or depot
* @note Works for both waypoints and rail depots