tron@10032: /* $Id$ */
tron@10032: 
tron@10032: #ifndef BRIDGE_MAP_H
tron@10032: #define BRIDGE_MAP_H
tron@10032: 
tron@10032: #include "direction.h"
tron@10032: #include "macros.h"
tron@10032: #include "map.h"
tron@10032: #include "rail.h"
tron@10032: #include "tile.h"
tron@10032: 
tron@10032: 
tron@10032: static inline bool IsBridge(TileIndex t)
tron@10032: {
tron@10032: 	assert(IsTileType(t, MP_TUNNELBRIDGE));
tron@10032: 	return HASBIT(_m[t].m5, 7);
tron@10032: }
tron@10032: 
tron@10032: static inline bool IsBridgeTile(TileIndex t)
tron@10032: {
tron@10032: 	return IsTileType(t, MP_TUNNELBRIDGE) && IsBridge(t);
tron@10032: }
tron@10032: 
tron@10032: 
tron@10032: static inline bool IsBridgeRamp(TileIndex t)
tron@10032: {
tron@10032: 	assert(IsBridgeTile(t));
tron@10032: 	return !HASBIT(_m[t].m5, 6);
tron@10032: }
tron@10032: 
tron@10032: static inline bool IsBridgeMiddle(TileIndex t)
tron@10032: {
tron@10032: 	assert(IsBridgeTile(t));
tron@10032: 	return HASBIT(_m[t].m5, 6);
tron@10032: }
tron@10032: 
tron@10032: 
tron@10032: /**
tron@10032:  * Get the direction pointing onto the bridge
tron@10032:  */
tron@10032: static inline DiagDirection GetBridgeRampDirection(TileIndex t)
tron@10032: {
tron@10032: 	assert(IsBridgeRamp(t));
tron@10032: 	/* Heavy wizardry to convert the X/Y (bit 0) + N/S (bit 5) encoding of
tron@10032: 	 * bridges to a DiagDirection
tron@10032: 	 */
tron@10032: 	return (DiagDirection)((6 - (_m[t].m5 >> 4 & 2) - (_m[t].m5 & 1)) % 4);
tron@10032: }
tron@10032: 
tron@10032: 
tron@10032: static inline Axis GetBridgeAxis(TileIndex t)
tron@10032: {
tron@10032: 	assert(IsBridgeMiddle(t));
tron@10032: 	return (Axis)GB(_m[t].m5, 0, 1);
tron@10032: }
tron@10032: 
tron@10032: 
tron@10032: static inline bool IsTransportUnderBridge(TileIndex t)
tron@10032: {
tron@10032: 	assert(IsBridgeMiddle(t));
tron@10032: 	return HASBIT(_m[t].m5, 5);
tron@10032: }
tron@10032: 
tron@10032: #endif