--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/road_map.h	Tue Jan 02 19:19:48 2007 +0000
@@ -0,0 +1,213 @@
+/* $Id$ */
+
+#ifndef ROAD_MAP_H
+#define ROAD_MAP_H
+
+#include "macros.h"
+#include "rail.h"
+#include "road.h"
+#include "tile.h"
+
+
+typedef enum RoadTileType {
+	ROAD_TILE_NORMAL,
+	ROAD_TILE_CROSSING,
+	ROAD_TILE_DEPOT
+} RoadTileType;
+
+static inline RoadTileType GetRoadTileType(TileIndex t)
+{
+	assert(IsTileType(t, MP_STREET));
+	return (RoadTileType)GB(_m[t].m5, 4, 4);
+}
+
+static inline bool IsLevelCrossing(TileIndex t)
+{
+	return GetRoadTileType(t) == ROAD_TILE_CROSSING;
+}
+
+static inline bool IsLevelCrossingTile(TileIndex t)
+{
+	return IsTileType(t, MP_STREET) && IsLevelCrossing(t);
+}
+
+static inline RoadBits GetRoadBits(TileIndex t)
+{
+	assert(GetRoadTileType(t) == ROAD_TILE_NORMAL);
+	return (RoadBits)GB(_m[t].m5, 0, 4);
+}
+
+static inline void SetRoadBits(TileIndex t, RoadBits r)
+{
+	assert(GetRoadTileType(t) == ROAD_TILE_NORMAL); // XXX incomplete
+	SB(_m[t].m5, 0, 4, r);
+}
+
+
+static inline Axis GetCrossingRoadAxis(TileIndex t)
+{
+	assert(GetRoadTileType(t) == ROAD_TILE_CROSSING);
+	return (Axis)GB(_m[t].m5, 3, 1);
+}
+
+static inline RoadBits GetCrossingRoadBits(TileIndex tile)
+{
+	return GetCrossingRoadAxis(tile) == AXIS_X ? ROAD_X : ROAD_Y;
+}
+
+static inline TrackBits GetCrossingRailBits(TileIndex tile)
+{
+	return AxisToTrackBits(OtherAxis(GetCrossingRoadAxis(tile)));
+}
+
+
+// TODO swap owner of road and rail
+static inline Owner GetCrossingRoadOwner(TileIndex t)
+{
+	assert(GetRoadTileType(t) == ROAD_TILE_CROSSING);
+	return (Owner)_m[t].m3;
+}
+
+static inline void SetCrossingRoadOwner(TileIndex t, Owner o)
+{
+	assert(GetRoadTileType(t) == ROAD_TILE_CROSSING);
+	_m[t].m3 = o;
+}
+
+static inline void UnbarCrossing(TileIndex t)
+{
+	assert(GetRoadTileType(t) == ROAD_TILE_CROSSING);
+	CLRBIT(_m[t].m5, 2);
+}
+
+static inline void BarCrossing(TileIndex t)
+{
+	assert(GetRoadTileType(t) == ROAD_TILE_CROSSING);
+	SETBIT(_m[t].m5, 2);
+}
+
+static inline bool IsCrossingBarred(TileIndex t)
+{
+	assert(GetRoadTileType(t) == ROAD_TILE_CROSSING);
+	return HASBIT(_m[t].m5, 2);
+}
+
+#define IsOnDesert IsOnSnow
+static inline bool IsOnSnow(TileIndex t)
+{
+	return HASBIT(_m[t].m4, 7);
+}
+
+#define ToggleDesert ToggleSnow
+static inline void ToggleSnow(TileIndex t)
+{
+	TOGGLEBIT(_m[t].m4, 7);
+}
+
+
+typedef enum Roadside {
+	ROADSIDE_BARREN           = 0,
+	ROADSIDE_GRASS            = 1,
+	ROADSIDE_PAVED            = 2,
+	ROADSIDE_STREET_LIGHTS    = 3,
+	ROADSIDE_TREES            = 5,
+	ROADSIDE_GRASS_ROAD_WORKS = 6,
+	ROADSIDE_PAVED_ROAD_WORKS = 7
+} Roadside;
+
+static inline Roadside GetRoadside(TileIndex tile)
+{
+	return (Roadside)GB(_m[tile].m4, 4, 3);
+}
+
+static inline void SetRoadside(TileIndex tile, Roadside s)
+{
+	SB(_m[tile].m4, 4, 3, s);
+}
+
+static inline bool HasRoadWorks(TileIndex t)
+{
+	return GetRoadside(t) >= ROADSIDE_GRASS_ROAD_WORKS;
+}
+
+static inline bool IncreaseRoadWorksCounter(TileIndex t)
+{
+	AB(_m[t].m4, 0, 4, 1);
+
+	return GB(_m[t].m4, 0, 4) == 15;
+}
+
+static inline void StartRoadWorks(TileIndex t)
+{
+	assert(!HasRoadWorks(t));
+	/* Remove any trees or lamps in case or roadwork */
+	switch (GetRoadside(t)) {
+		case ROADSIDE_BARREN:
+		case ROADSIDE_GRASS:  SetRoadside(t, ROADSIDE_GRASS_ROAD_WORKS); break;
+		default:              SetRoadside(t, ROADSIDE_PAVED_ROAD_WORKS); break;
+	}
+}
+
+static inline void TerminateRoadWorks(TileIndex t)
+{
+	assert(HasRoadWorks(t));
+	SetRoadside(t, (Roadside)(GetRoadside(t) - ROADSIDE_GRASS_ROAD_WORKS + ROADSIDE_GRASS));
+	/* Stop the counter */
+	SB(_m[t].m4, 0, 4, 0);
+}
+
+
+static inline DiagDirection GetRoadDepotDirection(TileIndex t)
+{
+	assert(GetRoadTileType(t) == ROAD_TILE_DEPOT);
+	return (DiagDirection)GB(_m[t].m5, 0, 2);
+}
+
+
+/**
+ * Returns the RoadBits on an arbitrary tile
+ * Special behavior:
+ * - road depots: entrance is treated as road piece
+ * - road tunnels: entrance is treated as road piece
+ * - bridge ramps: start of the ramp is treated as road piece
+ * - bridge middle parts: bridge itself is ignored
+ */
+RoadBits GetAnyRoadBits(TileIndex);
+
+
+TrackBits GetAnyRoadTrackBits(TileIndex tile);
+
+
+static inline void MakeRoadNormal(TileIndex t, Owner owner, RoadBits bits, TownID town)
+{
+	SetTileType(t, MP_STREET);
+	SetTileOwner(t, owner);
+	_m[t].m2 = town;
+	_m[t].m3 = 0;
+	_m[t].m4 = 0 << 7 | 0 << 4 | 0;
+	_m[t].m5 = ROAD_TILE_NORMAL << 4 | bits;
+}
+
+
+static inline void MakeRoadCrossing(TileIndex t, Owner road, Owner rail, Axis roaddir, RailType rt, uint town)
+{
+	SetTileType(t, MP_STREET);
+	SetTileOwner(t, rail);
+	_m[t].m2 = town;
+	_m[t].m3 = road;
+	_m[t].m4 = 0 << 7 | 0 << 4 | rt;
+	_m[t].m5 = ROAD_TILE_CROSSING << 4 | roaddir << 3 | 0 << 2;
+}
+
+
+static inline void MakeRoadDepot(TileIndex t, Owner owner, DiagDirection dir)
+{
+	SetTileType(t, MP_STREET);
+	SetTileOwner(t, owner);
+	_m[t].m2 = 0;
+	_m[t].m3 = 0;
+	_m[t].m4 = 0;
+	_m[t].m5 = ROAD_TILE_DEPOT << 4 | dir;
+}
+
+#endif /* ROAD_MAP_H */