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/* $Id$ */

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/** @file tunnel_map.h Map accessors for tunnels. */

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#ifndef TUNNEL_MAP_H

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#define TUNNEL_MAP_H

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#include "direction_func.h"

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#include "rail_type.h"

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#include "road_type.h"

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#include "transport_type.h"

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#include "tile_map.h"

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/**

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 * Is this a tunnel (entrance)?

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 * @param t the tile that might be a tunnel

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 * @pre IsTileType(t, MP_TUNNELBRIDGE)

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 * @return true if and only if this tile is a tunnel (entrance)

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 */

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static inline bool IsTunnel(TileIndex t)

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{

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	assert(IsTileType(t, MP_TUNNELBRIDGE));

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	return !HasBit(_m[t].m5, 7);

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}

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/**

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 * Is this a tunnel (entrance)?

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 * @param t the tile that might be a tunnel

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 * @return true if and only if this tile is a tunnel (entrance)

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 */

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static inline bool IsTunnelTile(TileIndex t)

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{

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	return IsTileType(t, MP_TUNNELBRIDGE) && IsTunnel(t);

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}

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TileIndex GetOtherTunnelEnd(TileIndex);

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bool IsTunnelInWay(TileIndex, uint z);

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bool IsTunnelInWayDir(TileIndex tile, uint z, DiagDirection dir);

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/**

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 * Makes a road tunnel entrance

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 * @param t the entrance of the tunnel

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 * @param o the owner of the entrance

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 * @param d the direction facing out of the tunnel

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 * @param r the road type used in the tunnel

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 */

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static inline void MakeRoadTunnel(TileIndex t, Owner o, DiagDirection d, RoadTypes r)

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{

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	SetTileType(t, MP_TUNNELBRIDGE);

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	SetTileOwner(t, o);

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	_m[t].m2 = 0;

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	_m[t].m3 = r;

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	_m[t].m4 = 0;

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	_m[t].m5 = TRANSPORT_ROAD << 2 | d;

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}

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/**

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 * Makes a rail tunnel entrance

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 * @param t the entrance of the tunnel

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 * @param o the owner of the entrance

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 * @param d the direction facing out of the tunnel

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 * @param r the rail type used in the tunnel

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 */

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static inline void MakeRailTunnel(TileIndex t, Owner o, DiagDirection d, RailType r)

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{

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	SetTileType(t, MP_TUNNELBRIDGE);

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	SetTileOwner(t, o);

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	_m[t].m2 = 0;

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	_m[t].m3 = r;

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	_m[t].m4 = 0;

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	_m[t].m5 = TRANSPORT_RAIL << 2 | d;

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}

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#endif /* TUNNEL_MAP_H */