tron@3069: /* $Id$ */
tron@3069: 
tron@3518: #ifndef ROAD_H
tron@3518: #define ROAD_H
tron@3069: 
rubidium@5838: #include "helpers.hpp"
rubidium@5838: 
rubidium@6574: enum RoadBits {
rubidium@5838: 	ROAD_NONE = 0U,
peter1138@3795: 	ROAD_NW  = 1U,
peter1138@3795: 	ROAD_SW  = 2U,
peter1138@3795: 	ROAD_SE  = 4U,
peter1138@3795: 	ROAD_NE  = 8U,
tron@3069: 	ROAD_X   = ROAD_SW | ROAD_NE,
tron@3069: 	ROAD_Y   = ROAD_NW | ROAD_SE,
tron@3069: 	ROAD_ALL = ROAD_X  | ROAD_Y
rubidium@6574: };
tron@3069: 
rubidium@5838: DECLARE_ENUM_AS_BIT_SET(RoadBits);
rubidium@5838: 
tron@3103: static inline RoadBits ComplementRoadBits(RoadBits r)
tron@3103: {
KUDr@3900: 	return (RoadBits)(ROAD_ALL ^ r);
tron@3103: }
tron@3103: 
tron@3146: static inline RoadBits DiagDirToRoadBits(DiagDirection d)
tron@3146: {
KUDr@3900: 	return (RoadBits)(1U << (3 ^ d));
tron@3146: }
tron@3146: 
rubidium@6335: /** Checks whether the trackdir means that we are reversing */
rubidium@6335: static inline bool IsReversingRoadTrackdir(Trackdir dir)
rubidium@6335: {
rubidium@6335: 	return (dir & 0x07) >= 6;
rubidium@6335: }
rubidium@6335: 
rubidium@6335: /** Checks whether the given trackdir is a straight road */
rubidium@6335: static inline bool IsStraightRoadTrackdir(Trackdir dir)
rubidium@6335: {
rubidium@6335: 	return (dir & 0x06) == 0;
rubidium@6335: }
rubidium@6335: 
rubidium@6442: /**
rubidium@6442:  * Is it allowed to remove the given road bits from the given tile?
rubidium@6442:  * @param tile      the tile to remove the road from
rubidium@6442:  * @param remove    the roadbits that are going to be removed
rubidium@6442:  * @param owner     the actual owner of the roadbits of the tile
rubidium@6442:  * @param edge_road are the removed bits from a town?
rubidium@6442:  * @return true when it is allowed to remove the road bits
rubidium@6442:  */
rubidium@6442: bool CheckAllowRemoveRoad(TileIndex tile, RoadBits remove, Owner owner, bool *edge_road);
rubidium@6442: 
peter1138@4666: #endif /* ROAD_H */