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/* $Id$ */

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/** @file tunnel_map.h */

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#ifndef TUNNEL_MAP_H

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#define TUNNEL_MAP_H

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#include "direction.h"

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#include "macros.h"

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#include "map.h"

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#include "rail.h"

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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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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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static inline DiagDirection GetTunnelDirection(TileIndex t)

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{

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	assert(IsTunnelTile(t));

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	return (DiagDirection)GB(_m[t].m5, 0, 2);

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}

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static inline TransportType GetTunnelTransportType(TileIndex t)

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{

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	assert(IsTunnelTile(t));

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	return (TransportType)GB(_m[t].m5, 2, 2);

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}

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static inline bool HasTunnelSnowOrDesert(TileIndex t)

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{

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	assert(IsTunnelTile(t));

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	return HASBIT(_m[t].m4, 7);

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}

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static inline void SetTunnelSnowOrDesert(TileIndex t, bool snow_or_desert)

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{

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	assert(IsTunnelTile(t));

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	SB(_m[t].m4, 7, 1, snow_or_desert);

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}

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TileIndex GetOtherTunnelEnd(TileIndex);

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bool IsTunnelInWay(TileIndex, uint z);

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

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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 = 0;

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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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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 */