/**
* 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
*/
public static void UnreserveTrack(TileIndex tile, Track t)
{
Debug.Assert(HasTrack(tile, t));
TrackBits res = GetRailReservationTrackBits(tile);
res &= ~TrackToTrackBits(t);
SetTrackReservation(tile, res);
}
/**
* Sets the reserved track bits of the tile
* @pre IsPlainRailTile(t) && !TracksOverlap(b)
* @param t the tile to change
* @param b the track bits
*/
public static void SetTrackReservation(this TileIndex t, TrackBits b)
{
Debug.Assert(IsPlainRailTile(t));
Debug.Assert(b != TrackBits.INVALID_TRACK_BIT);
Debug.Assert(!TracksOverlap(b));
Track track = RemoveFirstTrack(&b);
BitMath.SB(Map._m[t].m2, 8, 3, track == Track.INVALID_TRACK ? 0 : track + 1);
BitMath.SB(Map._m[t].m2, 11, 1, (byte)(b != TrackBits.TRACK_BIT_NONE));
}
public static void MakeRailNormal(this TileIndex t, Owner o, TrackBits b, RailType r)
{
TileMap.SetTileType(t, TileType.MP_RAILWAY);
TileMap.SetTileOwner(t, o);
Map._m[t].m2 = 0;
Map._m[t].m3 = (byte)r;
Map._m[t].m4 = 0;
Map._m[t].m5 = (byte)((int)RailTileType.RAIL_TILE_NORMAL << 6 | b);
BitMath.SB(Map._me[t].m6, 2, 4, 0);
Map._me[t].m7 = 0;
}
/**
* 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
*/
public static bool TryReserveTrack(TileIndex tile, Track t)
{
Debug.Assert(HasTrack(tile, t));
TrackBits bits = TrackToTrackBits(t);
TrackBits res = GetRailReservationTrackBits(tile);
if ((res & bits) != TrackBits.TRACK_BIT_NONE)
{
return(false); // already reserved
}
res |= bits;
if (TracksOverlap(res))
{
return(false); // crossing reservation present
}
SetTrackReservation(tile, res);
return(true);
}
/**
* Sets the track bits of the given tile
* @param t the tile to set the track bits of
* @param b the new track bits for the tile
*/
public static void SetTrackBits(this TileIndex t, TrackBits b)
{
Debug.Assert(IsPlainRailTile(t));
BitMath.SB(Map._m[t].m5, 0, 6, b);
}
