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/* $Id$ */

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/** @file tunnelbridge_map.h Functions that have tunnels and bridges in common */

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#ifndef TUNNELBRIDGE_MAP_H

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#define TUNNELBRIDGE_MAP_H

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#include "direction_func.h"

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#include "core/bitmath_func.hpp"  /* GB, HasBit, SB */

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#include "map.h"                  /* Tile, TileIndex */

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#include "tile.h"                 /* TileType, IsTileType */

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#include "openttd.h"              /* TransportType */

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/**

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 * Tunnel: Get the direction facing out of the tunnel

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 * Bridge: Get the direction pointing onto the bridge

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 * @param t The tile to analyze

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 * @pre IsTileType(t, MP_TUNNELBRIDGE)

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 * @return the above mentionned direction

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 */

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static inline DiagDirection GetTunnelBridgeDirection(TileIndex t)

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{

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	assert(IsTileType(t, MP_TUNNELBRIDGE));

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

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}

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/**

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 * Tunnel: Get the transport type of the tunnel (road or rail)

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 * Bridge: Get the transport type of the bridge's ramp

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 * @param t The tile to analyze

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 * @pre IsTileType(t, MP_TUNNELBRIDGE)

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 * @return the transport type in the tunnel/bridge

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 */

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static inline TransportType GetTunnelBridgeTransportType(TileIndex t)

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{

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	assert(IsTileType(t, MP_TUNNELBRIDGE));

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

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}

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/**

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 * Tunnel: Is this tunnel entrance in a snowy or desert area?

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 * Bridge: Does the bridge ramp lie in a snow or desert area?

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 * @param t The tile to analyze

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 * @pre IsTileType(t, MP_TUNNELBRIDGE)

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 * @return true if and only if the tile is in a snowy/desert area

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 */

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static inline bool HasTunnelBridgeSnowOrDesert(TileIndex t)

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{

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	assert(IsTileType(t, MP_TUNNELBRIDGE));

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

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}

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/**

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 * Tunnel: Places this tunnel entrance in a snowy or desert area, or takes it out of there.

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 * Bridge: Sets whether the bridge ramp lies in a snow or desert area.

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 * @param t the tunnel entrance / bridge ramp tile

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 * @param snow_or_desert is the entrance/ramp in snow or desert (true), when

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 *                       not in snow and not in desert false

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 * @pre IsTileType(t, MP_TUNNELBRIDGE)

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 */

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static inline void SetTunnelBridgeSnowOrDesert(TileIndex t, bool snow_or_desert)

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{

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	assert(IsTileType(t, MP_TUNNELBRIDGE));

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

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}

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#endif /* TUNNELBRIDGE_MAP_H */