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/* $Id$ */

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#ifndef BRIDGE_MAP_H

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#define BRIDGE_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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#include "tile.h"

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/**

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 * Get the direction pointing onto the bridge

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 */

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static inline DiagDirection GetBridgeRampDirection(TileIndex t)

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{

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	/* Heavy wizardry to convert the X/Y (bit 0) + N/S (bit 5) encoding of

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	 * bridges to a DiagDirection

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	 */

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	return (DiagDirection)((6 - (_m[t].m5 >> 4 & 2) - (_m[t].m5 & 1)) % 4);

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}

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static inline void SetClearUnderBridge(TileIndex t)

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{

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	SetTileOwner(t, OWNER_NONE);

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	SB(_m[t].m5, 3, 3, 0 << 2 | 0);

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}

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static inline void SetWaterUnderBridge(TileIndex t)

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{

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	SetTileOwner(t, OWNER_WATER);

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	SB(_m[t].m5, 3, 3, 0 << 2 | 1);

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}

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static inline void SetRailUnderBridge(TileIndex t, Owner o, RailType r)

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{

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	SetTileOwner(t, o);

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	SB(_m[t].m5, 3, 3, 1 << 2 | TRANSPORT_RAIL);

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	SB(_m[t].m3, 0, 4, r);

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}

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static inline void SetRoadUnderBridge(TileIndex t, Owner o)

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{

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	SetTileOwner(t, o);

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	SB(_m[t].m5, 3, 3, 1 << 2 | TRANSPORT_ROAD);

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}

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#endif