--- a/Makefile	Mon Jan 31 11:03:23 2005 +0000
+++ b/Makefile	Mon Jan 31 11:23:10 2005 +0000
@@ -595,6 +595,7 @@
 C_SOURCES += network_server.c
 C_SOURCES += network_udp.c
 C_SOURCES += news_gui.c
+C_SOURCES += npf.c
 C_SOURCES += oldloader.c
 C_SOURCES += order_cmd.c
 C_SOURCES += order_gui.c

--- a/functions.h	Mon Jan 31 11:03:23 2005 +0000
+++ b/functions.h	Mon Jan 31 11:23:10 2005 +0000
@@ -26,11 +26,6 @@
 void GetTileDesc(uint tile, TileDesc *td);
 void DrawTile(TileInfo *ti);
 
-uint TileAddWrap(TileIndex tile, int addx, int addy);
-enum {
-	TILE_WRAPPED = (uint)-1
-};
-
 bool IsValidTile(uint tile);
 
 static inline Point RemapCoords(int x, int y, int z)

--- a/industry_cmd.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/industry_cmd.c	Mon Jan 31 11:23:10 2005 +0000
@@ -978,7 +978,7 @@
 		int x = (i->width>>1) + Random() % 31 - 16;
 		int y = (i->height>>1) + Random() % 31 - 16;
 		tile = TileAddWrap(i->xy, x, y);
-		if (tile != TILE_WRAPPED)
+		if (tile != INVALID_TILE)
 			PlantFarmField(tile);
 	}
 }
@@ -1496,7 +1496,7 @@
 			int x = Random() % 31 - 16;
 			int y = Random() % 31 - 16;
 			uint new_tile = TileAddWrap(tile, x, y);
-			if (new_tile != TILE_WRAPPED)
+			if (new_tile != INVALID_TILE)
 				PlantFarmField(new_tile);
 		}
 	}

--- a/landscape.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/landscape.c	Mon Jan 31 11:23:10 2005 +0000
@@ -721,25 +721,6 @@
 	));
 }
 
-// This function checks if we add addx/addy to tile, if we
-//  do wrap around the edges. For example, tile = (10,2) and
-//  addx = +3 and addy = -4. This function will now return
-//  TILE_WRAPPED, because the y is wrapped. This is needed in
-//  for example, farmland. When the tile is not wrapped,
-//  the result will be tile + TILE_XY(addx, addy)
-uint TileAddWrap(TileIndex tile, int addx, int addy)
-{
-	uint x, y;
-	x = TileX(tile) + addx;
-	y = TileY(tile) + addy;
-
-	// Are we about to wrap?
-	if (x < MapMaxX() && y < MapMaxY())
-		return tile + TILE_XY(addx, addy);
-
-	return TILE_WRAPPED;
-}
-
 bool IsValidTile(uint tile)
 {
 	return (tile < MapSizeX() * MapMaxY() && TileX(tile) != MapMaxX());

--- a/lang/english.txt	Mon Jan 31 11:03:23 2005 +0000
+++ b/lang/english.txt	Mon Jan 31 11:23:10 2005 +0000
@@ -973,8 +973,8 @@
 STR_AIRCRAFT_AUTORENEW_FAILED					:{WHITE}Autorenew failed on aircraft {COMMA16} (money limit)
 
 STR_CONFIG_PATCHES						:{BLACK}Configure Patches
-STR_CONFIG_PATCHES_TIP						:{BLACK}Configure the patches
-STR_CONFIG_PATCHES_CAPTION					:{WHITE}Configure Patches
+STR_CONFIG_PATCHES_TIP									:{BLACK}Configure the patches
+STR_CONFIG_PATCHES_CAPTION							:{WHITE}Configure Patches
 
 STR_CONFIG_PATCHES_OFF						:Off
 STR_CONFIG_PATCHES_ON						:On
@@ -984,6 +984,7 @@
 STR_CONFIG_PATCHES_EXTRADYNAMITE				:{LTBLUE}Allow removal of more town-owned roads, bridges, etc: {ORANGE}{STRING}
 STR_CONFIG_PATCHES_MAMMOTHTRAINS				:{LTBLUE}Enable building very long trains: {ORANGE}{STRING}
 STR_CONFIG_PATCHES_REALISTICACCEL				:{LTBLUE}Enable realistic acceleration for trains: {ORANGE}{STRING}
+STR_CONFIG_PATCHES_FORBID_90_DEG				:{LTBLUE}Forbid trains and ships to make 90 deg turns: {ORANGE}{STRING} {LTBLUE} (requires NPF)
 STR_CONFIG_PATCHES_JOINSTATIONS					:{LTBLUE}Join train stations built next to each other: {ORANGE}{STRING}
 STR_CONFIG_PATCHES_FULLLOADANY					:{LTBLUE}Leave station when any cargo is full, if 'full load': {ORANGE}{STRING}
 STR_CONFIG_PATCHES_IMPROVEDLOAD					:{LTBLUE}Use improved loading algorithm: {ORANGE}{STRING}
@@ -1003,7 +1004,8 @@
 STR_CONFIG_PATCHES_BRIBE					:{LTBLUE}Allow bribing of the local authority: {ORANGE}{STRING}
 STR_CONFIG_PATCHES_NEW_DEPOT_FINDING				:{LTBLUE}New depot finding: {ORANGE}{STRING}
 STR_CONFIG_PATCHES_NONUNIFORM_STATIONS				:{LTBLUE}Nonuniform stations: {ORANGE}{STRING}
-STR_CONFIG_PATCHES_NEW_TRAIN_PATHFIND				:{LTBLUE}New algorithm for train pathfinding: {ORANGE}{STRING}
+STR_CONFIG_PATCHES_NEW_TRAIN_PATHFIND				:{LTBLUE}New algorithm for train pathfinding (NTP): {ORANGE}{STRING}
+STR_CONFIG_PATCHES_NEW_PATHFINDING_ALL				:{LTBLUE}New global pathfinding (NPF, overrides NTP): {ORANGE}{STRING}
 
 STR_CONFIG_PATCHES_SMALL_AIRPORTS				:{LTBLUE}Always allow small airports: {ORANGE}{STRING}
 

--- a/macros.h	Mon Jan 31 11:03:23 2005 +0000
+++ b/macros.h	Mon Jan 31 11:23:10 2005 +0000
@@ -110,14 +110,32 @@
 
 static inline int FindFirstBit2x64(int value)
 {
+/*
 	int i = 0;
 	if ( (byte) value == 0) {
 		i += 8;
 		value >>= 8;
 	}
 	return i + FIND_FIRST_BIT(value & 0x3F);
+
+Faster ( or at least cleaner ) implementation below?
+*/
+	if ( (byte) value == 0) {
+		return FIND_FIRST_BIT((value >> 8) & 0x3F) + 8;
+	} else {
+		return FIND_FIRST_BIT(value & 0x3F);
+	}
+
 }
 
+static inline int KillFirstBit2x64(int value)
+{
+	if ( (byte) value == 0) {
+		return KILL_FIRST_BIT((value >> 8) & 0x3F) << 8;
+	} else {
+		return value & (KILL_FIRST_BIT(value & 0x3F)|0x3F00);
+	}
+}
 
 /* [min,max), strictly less than */
 #define IS_BYTE_INSIDE(a,min,max) ((byte)((a)-(min)) < (byte)((max)-(min)))

--- a/map.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/map.c	Mon Jan 31 11:23:10 2005 +0000
@@ -108,6 +108,32 @@
 }
 
 
+// This function checks if we add addx/addy to tile, if we
+//  do wrap around the edges. For example, tile = (10,2) and
+//  addx = +3 and addy = -4. This function will now return
+//  INVALID_TILE, because the y is wrapped. This is needed in
+//  for example, farmland. When the tile is not wrapped,
+//  the result will be tile + TILE_XY(addx, addy)
+uint TileAddWrap(TileIndex tile, int addx, int addy)
+{
+	uint x, y;
+	x = TileX(tile) + addx;
+	y = TileY(tile) + addy;
+
+	// Are we about to wrap?
+		if (x < MapMaxX() && y < MapMaxY())
+		return tile + TILE_XY(addx, addy);
+
+	return INVALID_TILE;
+}
+
+const TileIndexDiffC _tileoffs_by_dir[] = {
+	{-1,  0},
+	{ 0,  1},
+	{ 1,  0},
+	{ 0, -1}
+};
+
 uint DistanceManhattan(TileIndex t0, TileIndex t1)
 {
 	return
@@ -151,10 +177,3 @@
 	return minl < minh ? minl : minh;
 }
 
-
-const TileIndexDiffC _tileoffs_by_dir[] = {
-	{-1,  0},
-	{ 0,  1},
-	{ 1,  0},
-	{ 0, -1}
-};

--- a/map.h	Mon Jan 31 11:03:23 2005 +0000
+++ b/map.h	Mon Jan 31 11:23:10 2005 +0000
@@ -35,7 +35,9 @@
 uint ScaleByMapSize1D(uint); // Scale relative to the circumference of the map
 
 typedef uint32 TileIndex;
-
+enum {
+	INVALID_TILE = (uint32) -1
+};
 
 static inline uint TileX(TileIndex tile)
 {
@@ -71,6 +73,24 @@
 
 #define TILE_ADDXY(tile, x, y) TILE_ADD(tile, TILE_XY(x, y))
 
+uint TileAddWrap(TileIndex tile, int addx, int addy);
+
+static inline TileIndexDiffC TileIndexDiffCByDir(uint dir) {
+	extern const TileIndexDiffC _tileoffs_by_dir[4];
+	return _tileoffs_by_dir[dir];
+}
+
+/* Returns tile + the diff given in diff. If the result tile would end up
+ * outside of the map, INVALID_TILE is returned instead.
+ */
+static inline TileIndex AddTileIndexDiffCWrap(TileIndex tile, TileIndexDiffC diff) {
+	int x = TileX(tile) + diff.x;
+	int y = TileY(tile) + diff.y;
+	if (x < 0 || y < 0 || x > (int)MapMaxX() || y > (int)MapMaxY())
+		return INVALID_TILE;
+	else
+		return TILE_XY(x, y);
+}
 
 // Functions to calculate distances
 uint DistanceManhattan(TileIndex, TileIndex); // also known as L1-Norm

--- a/misc.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/misc.c	Mon Jan 31 11:23:10 2005 +0000
@@ -173,6 +173,7 @@
 static void InitializeNameMgr(void);
 void InitializePlayers(void);
 static void InitializeCheats(void);
+void InitializeNPF(void);
 
 void GenerateLandscape(void);
 void GenerateClearTile(void);
@@ -235,6 +236,7 @@
 	InitializeNameMgr();
 	InitializeVehiclesGuiList();
 	InitializeTrains();
+	InitializeNPF();
 
 	InitializePlayers();
 	InitializeCheats();

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/npf.c	Mon Jan 31 11:23:10 2005 +0000
@@ -0,0 +1,776 @@
+#include "stdafx.h"
+#include "ttd.h"
+#include "npf.h"
+#include "aystar.h"
+#include "macros.h"
+#include "pathfind.h"
+#include "station.h"
+#include "tile.h"
+
+AyStar _train_find_station;
+AyStar _train_find_depot;
+AyStar _road_find_station;
+AyStar _road_find_depot;
+AyStar _npf_aystar;
+
+/* Maps a trackdir to the bit that stores its status in the map arrays, in the
+ * direction along with the trackdir */
+const byte _signal_along_trackdir[14] = {
+	0x80, 0x80, 0x80, 0x20, 0x40, 0x10, 0, 0,
+	0x40, 0x40, 0x40, 0x10, 0x80, 0x20
+};
+
+/* Maps a trackdir to the bit that stores its status in the map arrays, in the
+ * direction against the trackdir */
+const byte _signal_against_trackdir[14] = {
+	0x40, 0x40, 0x40, 0x10, 0x80, 0x20, 0, 0,
+	0x80, 0x80, 0x80, 0x20, 0x40, 0x10
+};
+
+/* Maps a trackdir to the trackdirs that can be reached from it (ie, when
+ * entering the next tile */
+const uint16 _trackdir_reaches_trackdirs[14] = {
+0x1009, 0x0016, 0x1009, 0x0016, 0x0520, 0x0016, 0, 0,
+0x0520, 0x2A00, 0x2A00, 0x0520, 0x2A00, 0x1009
+};
+
+/* Maps a trackdir to all trackdirs that make 90 deg turns with it. */
+const uint16 _trackdir_crosses_trackdirs[14] = {
+0x0202, 0x0101, 0x3030, 0x3030, 0x0C0C, 0x0C0C, 0, 0,
+0x0202, 0x0101, 0x3030, 0x3030, 0x0C0C, 0x0C0C
+};
+
+/* Maps a track to all tracks that make 90 deg turns with it. */
+const byte _track_crosses_tracks[6] = {
+	0x2, /* Track 1 -> Track 2 */
+	0x1, /* Track 2 -> Track 1 */
+	0x30, /* Upper -> Left | Right */
+	0x30, /* Lower -> Left | Right */
+	0x0C, /* Left -> Upper | Lower */
+	0x0C, /* Right -> Upper | Lower */
+};
+
+/* Maps a trackdir to the (4-way) direction the tile is exited when following
+ * that trackdir */
+const byte _trackdir_to_exitdir[14] = {
+	0,1,0,1,2,1, 0,0,
+	2,3,3,2,3,0,
+};
+
+const byte _track_exitdir_to_trackdir[6][4] = {
+	{0,    0xff, 8,    0xff},
+	{0xff, 1,    0xff, 9},
+	{2,    0xff, 0xff, 10},
+	{0xff, 3,    11,   0xf},
+	{0xff, 0xff, 4,    12},
+	{13,   5,    0xff, 0xff}
+};
+
+const byte _track_direction_to_trackdir[6][8] = {
+	{0xff, 0,    0xff, 0xff, 0xff, 8,    0xff, 0xff},
+	{0xff, 0xff, 0xff, 1,    0xff, 0xff, 0xff, 9},
+	{0xff, 0xff, 2,    0xff, 0xff, 0xff, 10,   0xff},
+	{0xff, 0xff, 3,    0xff, 0xff, 0xff, 11,   0xff},
+	{12,   0xff, 0xff, 0xff, 4,    0xff, 0xff, 0xff},
+	{13,   0xff, 0xff, 0xff, 5,    0xff, 0xff, 0xff}
+};
+
+const byte _dir_to_diag_trackdir[4] = {
+	0, 1, 8, 9,
+};
+
+const byte _reverse_dir[4] = {
+	2, 3, 0, 1
+};
+
+const byte _reverse_trackdir[14] = {
+	8, 9, 10, 11, 12, 13, 0xFF, 0xFF,
+	0, 1, 2,  3,  4,  5
+};
+
+/* The cost of each trackdir. A diagonal piece is the full NPF_TILE_LENGTH,
+ * the shorter piece is sqrt(2)/2*NPF_TILE_LENGTH =~ 0.7071
+ */
+#define NPF_STRAIGHT_LENGTH (uint)(NPF_TILE_LENGTH * 0.7071)
+static const uint _trackdir_length[14] = {
+NPF_TILE_LENGTH, NPF_TILE_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH, 0, 0,
+NPF_TILE_LENGTH, NPF_TILE_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH
+};
+
+uint NTPHash(uint key1, uint key2)
+{
+	return PATHFIND_HASH_TILE(key1);
+}
+
+int32 NPFCalcZero(AyStar* as, AyStarNode* current, OpenListNode* parent) {
+	return 0;
+}
+
+/* Calcs the heuristic to the target station (using NPFFindStationOrTileData). After
+ * will save the heuristic into NPFFoundTargetData if it is the smallest until
+ * now. It will then also save AyStarNode.user_data[NPF_TRACKDIR_CHOICE] in
+ * best_trackdir
+ */
+int32 NPFCalcStationOrTileHeuristic(AyStar* as, AyStarNode* current, OpenListNode* parent) {
+	NPFFindStationOrTileData* fstd = (NPFFindStationOrTileData*)as->user_target;
+	NPFFoundTargetData* ftd = (NPFFoundTargetData*)as->user_path;
+	TileIndex from = current->tile;
+	TileIndex to = fstd->dest_coords;
+	uint dist = DistanceManhattan(from, to) * NPF_TILE_LENGTH;
+
+	if (dist < ftd->best_bird_dist) {
+		ftd->best_bird_dist = dist;
+		ftd->best_trackdir = current->user_data[NPF_TRACKDIR_CHOICE];
+	}
+	#ifdef NPF_DEBUG
+	debug("Calculating H for: (%d, %d). Result: %d", TileX(current->tile), TileY(current->tile), dist);
+	#endif
+	return dist;
+}
+
+/* Fills AyStarNode.user_data[NPF_TRACKDIRCHOICE] with the chosen direction to
+ * get here, either getting it from the current choice or from the parent's
+ * choice */
+void NPFFillTrackdirChoice(AyStarNode* current, OpenListNode* parent)
+{
+	if (parent->path.parent == NULL) {
+		byte trackdir = current->direction;
+		/* This is a first order decision, so we'd better save the
+		 * direction we chose */
+		current->user_data[NPF_TRACKDIR_CHOICE] = trackdir;
+		#ifdef NPF_DEBUG
+		debug("Saving trackdir: %#x", trackdir);
+		#endif
+	} else {
+		/* We've already made the decision, so just save our parent's
+		 * decision */
+		current->user_data[NPF_TRACKDIR_CHOICE] = parent->path.node.user_data[NPF_TRACKDIR_CHOICE];
+	}
+
+}
+
+/* Will return the cost of the tunnel. If it is an entry, it will return the
+ * cost of that tile. If the tile is an exit, it will return the tunnel length
+ * including the exit tile. Requires that this is a Tunnel tile */
+uint NPFTunnelCost(AyStarNode* current) {
+	byte exitdir = _trackdir_to_exitdir[current->direction];
+	TileIndex tile = current->tile;
+	if ( (uint)(_map5[tile] & 3) == _reverse_dir[exitdir]) {
+		/* We just popped out if this tunnel, since were
+		 * facing the tunnel exit */
+		FindLengthOfTunnelResult flotr;
+		flotr = FindLengthOfTunnel(tile, _reverse_dir[exitdir]);
+		return flotr.length * NPF_TILE_LENGTH;
+		//TODO: Penalty for tunnels?
+	} else {
+		/* We are entering the tunnel, the enter tile is just a
+		 * straight track */
+		return NPF_TILE_LENGTH;
+	}
+}
+
+uint NPFSlopeCost(AyStarNode* current) {
+	TileIndex next = current->tile + TileOffsByDir(_trackdir_to_exitdir[current->direction]);
+	if (GetTileZ(next) > GetTileZ(current->tile)) {
+		/* Slope up */
+		return _patches.npf_rail_slope_penalty;
+	}
+	return 0;
+	/* Should we give a bonus for slope down? Probably not, we
+	 * could just substract that bonus from the penalty, because
+	 * there is only one level of steepness... */
+}
+
+void NPFMarkTile(TileIndex tile) {
+	switch(GetTileType(tile)) {
+		case MP_RAILWAY:
+		case MP_STREET:
+			/* DEBUG: mark visited tiles by mowing the grass under them
+			 * ;-) */
+			_map2[tile] &= ~15;
+			MarkTileDirtyByTile(tile);
+			break;
+		default:
+			break;
+	}
+}
+
+int32 NPFWaterPathCost(AyStar* as, AyStarNode* current, OpenListNode* parent) {
+	//TileIndex tile = current->tile;
+	int32 cost = 0;
+	byte trackdir = current->direction;
+
+	cost = _trackdir_length[trackdir]; /* Should be different for diagonal tracks */
+
+	/* TODO Penalties? */
+
+	return cost;
+}
+
+/* Determine the cost of this node, for road tracks */
+int32 NPFRoadPathCost(AyStar* as, AyStarNode* current, OpenListNode* parent) {
+	TileIndex tile = current->tile;
+	int32 cost = 0;
+	/* Determine base length */
+	switch (GetTileType(tile)) {
+		case MP_TUNNELBRIDGE:
+			if ((_map5[tile] & 0xF0)==0) {
+				cost = NPFTunnelCost(current);
+				break;
+			}
+			/* Fall through if above if is false, it is a bridge
+			 * then. We treat that as ordinary rail */
+		case MP_STREET:
+			cost = NPF_TILE_LENGTH;
+			break;
+		default:
+			break;
+	}
+
+	/* Determine extra costs */
+
+	/* Check for slope */
+	cost += NPFSlopeCost(current);
+
+	/* Check for turns */
+	//TODO
+
+	#ifdef NPF_MARKROUTE
+	NPFMarkTile(tile);
+	#endif
+	#ifdef NPF_DEBUG
+	debug("Calculating G for: (%d, %d). Result: %d", TileX(current->tile), TileY(current->tile), cost);
+	#endif
+	return cost;
+}
+
+
+/* Determine the cost of this node, for railway tracks */
+int32 NPFRailPathCost(AyStar* as, AyStarNode* current, OpenListNode* parent) {
+	TileIndex tile = current->tile;
+	byte trackdir = current->direction;
+	int32 cost = 0;
+	/* Determine base length */
+	switch (GetTileType(tile)) {
+		case MP_TUNNELBRIDGE:
+			if ((_map5[tile] & 0xF0)==0) {
+				cost = NPFTunnelCost(current);
+				break;
+			}
+			/* Fall through if above if is false, it is a bridge
+			 * then. We treat that as ordinary rail */
+		case MP_RAILWAY:
+			cost = _trackdir_length[trackdir]; /* Should be different for diagonal tracks */
+			break;
+		case MP_STREET: /* Railway crossing */
+			cost = NPF_TILE_LENGTH;
+			break;
+		default:
+			break;
+	}
+
+	/* Determine extra costs */
+
+	/* Ordinary track with signals */
+	if (IsTileType(tile, MP_RAILWAY) && (_map5[tile] & 0xC0) == 0x40) {
+		if ((_map2[tile] & _signal_along_trackdir[trackdir]) == 0) {
+			/* Signal facing us is red */
+			if (!(current->user_data[NPF_NODE_FLAGS] & NPF_FLAG_SEEN_SIGNAL)) {
+				/* Penalize the first signal we
+				 * encounter, if it is red */
+				cost += _patches.npf_rail_firstred_penalty;
+			}
+		}
+		current->user_data[NPF_NODE_FLAGS] |= NPF_FLAG_SEEN_SIGNAL;
+	}
+
+	/* Check for slope */
+	cost += NPFSlopeCost(current);
+
+	/* Check for turns */
+	//TODO
+
+	/* Check for occupied track */
+	//TODO
+
+	/* Check for station tiles */
+	if (IsTileType(tile, MP_STATION)) {
+		/* We give a station tile a penalty. Logically we would only
+		 * want to give station tiles that are not our destination
+		 * this penalty. This would discourage trains to drive through
+		 * busy stations. But, we can just give any station tile a
+		 * penalty, because every possible route will get this penalty
+		 * exactly once, on its end tile (if it's a station) and it
+		 * will therefore not make a difference. */
+		cost += _patches.npf_rail_station_penalty;
+	}
+
+	#ifdef NPF_MARKROUTE
+	NPFMarkTile(tile);
+	#endif
+	#ifdef NPF_DEBUG
+	debug("Calculating G for: (%d, %d). Result: %d", TileX(current->tile), TileY(current->tile), cost);
+	#endif
+	return cost;
+}
+
+/* Will find any depot */
+int32 NPFFindDepot(AyStar* as, OpenListNode *current) {
+	TileIndex tile = current->path.node.tile;
+	bool isDepot;
+	switch(GetTileType(tile)) {
+		case MP_RAILWAY:
+			/* Check if this is a rail depot */
+			isDepot = IsTrainDepotTile(tile);
+			break;
+		case MP_STREET:
+			/* Check if this is a road depot */
+			isDepot = IsRoadDepotTile(tile);
+			break;
+		case MP_WATER:
+			isDepot = IsShipDepotTile(tile);
+			break;
+		default:
+			isDepot = false;
+			break;
+	}
+	if (isDepot)
+		return AYSTAR_FOUND_END_NODE;
+	else
+		return AYSTAR_DONE;
+}
+
+/* Will find a station identified using the NPFFindStationOrTileData */
+int32 NPFFindStationOrTile(AyStar* as, OpenListNode *current) {
+	/* If GetNeighbours said we could get here, we assume the station type
+	 * is correct */
+	NPFFindStationOrTileData* fstd = (NPFFindStationOrTileData*)as->user_target;
+	TileIndex tile = current->path.node.tile;
+	if (	(fstd->station_index == -1 && tile == fstd->dest_coords) || /* We've found the tile, or */
+		(IsTileType(tile, MP_STATION) && _map2[tile] == fstd->station_index) /* the station */
+	   )
+			return AYSTAR_FOUND_END_NODE;
+	else
+		return AYSTAR_DONE;
+}
+
+/* To be called when current contains the (shortest route to) the target node.
+ * Will fill the contents of the NPFFoundTargetData using
+ * AyStarNode[NPF_TRACKDIR_CHOICE].
+ */
+void NPFSaveTargetData(AyStar* as, OpenListNode* current) {
+	NPFFoundTargetData* ftd = (NPFFoundTargetData*)as->user_path;
+	ftd->best_trackdir = current->path.node.user_data[NPF_TRACKDIR_CHOICE];
+	ftd->best_path_dist = current->g;
+	ftd->best_bird_dist = 0;
+	ftd->node = current->path.node;
+}
+
+/* Will just follow the results of GetTileTrackStatus concerning where we can
+ * go and where not. Uses AyStar.user_data[NPF_TYPE] as the transport type and
+ * an argument to GetTileTrackStatus. Will skip tunnels, meaning that the
+ * entry and exit are neighbours. Will fill AyStarNode.user_data[NPF_TRACKDIR_CHOICE] with an
+ * appropriate value, and copy AyStarNode.user_data[NPF_NODE_FLAGS] from the
+ * parent */
+void NPFFollowTrack(AyStar* aystar, OpenListNode* current) {
+	byte src_trackdir = current->path.node.direction;
+	TileIndex src_tile = current->path.node.tile;
+	byte src_exitdir = _trackdir_to_exitdir[src_trackdir];
+	FindLengthOfTunnelResult flotr;
+	TileIndex dst_tile;
+	int i = 0;
+	uint trackdirs, ts;
+	TransportType type = aystar->user_data[NPF_TYPE];
+	/* Initialize to 0, so we can jump out (return) somewhere an have no neighbours */
+	aystar->num_neighbours = 0;
+	#ifdef NPF_DEBUG
+	debug("Expanding: (%d, %d, %d) [%d]", TileX(src_tile), TileY(src_tile), src_trackdir, src_tile);
+	#endif
+
+	/* Find dest tile */
+	if (IsTileType(src_tile, MP_TUNNELBRIDGE) && (_map5[src_tile] & 0xF0)==0 && (_map5[src_tile] & 3) == src_exitdir) {
+		/* This is a tunnel. We know this tunnel is our type,
+		 * otherwise we wouldn't have got here. It is also facing us,
+		 * so we should skip it's body */
+		flotr = FindLengthOfTunnel(src_tile, src_exitdir);
+		dst_tile = flotr.tile;
+	} else {
+		if (
+			(type == TRANSPORT_ROAD && IsRoadStationTile(src_tile))
+			|| (type == TRANSPORT_ROAD && IsRoadDepotTile(src_tile))
+			|| (type == TRANSPORT_RAIL && IsTrainDepotTile(src_tile))
+			){
+			/* This is a road station or a train or road depot. We can enter and exit
+			 * those from one side only. Trackdirs don't support that (yet), so we'll
+			 * do this here. */
+
+			byte exitdir;
+			/* Find out the exit direction first */
+			if (IsRoadStationTile(src_tile))
+				exitdir = GetRoadStationDir(src_tile);
+			else /* Train or road depot. Direction is stored the same for both, in map5 */
+				exitdir = _map5[src_tile] & 3; /* Extract the direction from the map */
+
+			/* Let's see if were headed the right way */
+			if (src_trackdir != _dir_to_diag_trackdir[exitdir])
+				/* Not going out of the station/depot through the exit, but the back. No
+				 * neighbours then. */
+				return;
+		}
+		/* This a normal tile, a bridge, a tunnel exit, etc. */
+		dst_tile = AddTileIndexDiffCWrap(src_tile, TileIndexDiffCByDir(_trackdir_to_exitdir[src_trackdir]));
+		if (dst_tile == INVALID_TILE) {
+			/* We reached the border of the map */
+			/* TODO Nicer control flow for this */
+			return;
+		}
+	}
+
+	// TODO: check correct rail type (mono, maglev, etc)
+	// TODO: check tile owner
+
+	/* Determine available tracks */
+	if (type == TRANSPORT_ROAD && (IsRoadStationTile(dst_tile) || IsRoadDepotTile(dst_tile))){
+		byte exitdir;
+		/* Road stations and depots return 0 on GTTS, so we have to do this by hand... */
+			if (IsRoadStationTile(dst_tile))
+				exitdir = GetRoadStationDir(dst_tile);
+			else /* Road depot */
+				exitdir = _map5[dst_tile] & 3; /* Extract the direction from the map */
+			ts = (1 << _dir_to_diag_trackdir[exitdir]) |
+					(1 << _dir_to_diag_trackdir[_reverse_dir[exitdir]]);
+					/* Find the trackdirs that are available for a station with this orientation. They are in both directions */
+	} else {
+		ts = GetTileTrackStatus(dst_tile, type);
+	}
+	trackdirs = ts & 0x3F3F; /* Filter out signal status and the unused bits */
+
+	#ifdef NPF_DEBUG
+	debug("Next node: (%d, %d) [%d], possible trackdirs: %#x", TileX(dst_tile), TileY(dst_tile), dst_tile, trackdirs);
+	#endif
+	/* Select only trackdirs we can reach from our current trackdir */
+	trackdirs &= _trackdir_reaches_trackdirs[src_trackdir];
+	if (_patches.forbid_90_deg && (type == TRANSPORT_RAIL || type == TRANSPORT_WATER)) /* Filter out trackdirs that would make 90 deg turns for trains */
+		trackdirs &= ~_trackdir_crosses_trackdirs[src_trackdir];
+	#ifdef NPF_DEBUG
+	debug("After filtering: (%d, %d), possible trackdirs: %#x", TileX(dst_tile), TileY(dst_tile), trackdirs);
+	#endif
+
+	/* Enumerate possible track */
+	while (trackdirs != 0) {
+		byte dst_trackdir;
+		dst_trackdir =  FindFirstBit2x64(trackdirs);
+		trackdirs = KillFirstBit2x64(trackdirs);
+		#ifdef NPF_DEBUG
+		debug("Expanded into trackdir: %d, remaining trackdirs: %#x", dst_trackdir, trackdirs);
+		#endif
+
+		/* Check for oneway signal against us */
+		if (IsTileType(dst_tile, MP_RAILWAY) && (_map5[dst_tile]&0xC0) == 0x40) {
+			// the tile has a signal
+			byte signal_present = _map3_lo[dst_tile];
+			if (!(signal_present & _signal_along_trackdir[dst_trackdir])) {
+				// if one way signal not pointing towards us, stop going in this direction.
+				if (signal_present & _signal_against_trackdir[dst_trackdir])
+					break;
+			}
+		}
+		{
+			/* We've found ourselves a neighbour :-) */
+			AyStarNode* neighbour = &aystar->neighbours[i];
+			neighbour->tile = dst_tile;
+			neighbour->direction = dst_trackdir;
+			/* Save user data */
+			neighbour->user_data[NPF_NODE_FLAGS] = current->path.node.user_data[NPF_NODE_FLAGS];
+			NPFFillTrackdirChoice(neighbour, current);
+		}
+		i++;
+	}
+	aystar->num_neighbours = i;
+}
+
+/*
+ * Plan a route to the specified target (which is checked by target_proc),
+ * from start1 and if not NULL, from start2 as well. The type of transport we
+ * are checking is in type.
+ * When we are looking for one specific target (optionally multiple tiles), we
+ * should use a good heuristic to perform aystar search. When we search for
+ * multiple targets that are spread around, we should perform a breadth first
+ * search by specifiying CalcZero as our heuristic.
+ */
+NPFFoundTargetData NPFRouteInternal(AyStarNode* start1, AyStarNode* start2, NPFFindStationOrTileData* target, AyStar_EndNodeCheck target_proc, AyStar_CalculateH heuristic_proc, TransportType type) {
+	int r;
+	NPFFoundTargetData result;
+
+	/* Initialize procs */
+	_npf_aystar.CalculateH = heuristic_proc;
+	_npf_aystar.EndNodeCheck = target_proc;
+	_npf_aystar.FoundEndNode = NPFSaveTargetData;
+	_npf_aystar.GetNeighbours = NPFFollowTrack;
+	if (type == TRANSPORT_RAIL)
+		_npf_aystar.CalculateG = NPFRailPathCost;
+	else if (type == TRANSPORT_ROAD)
+		_npf_aystar.CalculateG = NPFRoadPathCost;
+	else if (type == TRANSPORT_WATER)
+		_npf_aystar.CalculateG = NPFWaterPathCost;
+	else
+		assert(0);
+
+	/* Initialize Start Node(s) */
+	start1->user_data[NPF_TRACKDIR_CHOICE] = 0xff;
+	start1->user_data[NPF_NODE_FLAGS] = 0;
+	_npf_aystar.addstart(&_npf_aystar, start1);
+	if (start2) {
+		start2->user_data[NPF_TRACKDIR_CHOICE] = 0xff;
+		start2->user_data[NPF_NODE_FLAGS] = NPF_FLAG_REVERSE;
+		_npf_aystar.addstart(&_npf_aystar, start2);
+	}
+
+	/* Initialize result */
+	result.best_bird_dist = (uint)-1;
+	result.best_path_dist = (uint)-1;
+	result.best_trackdir = 0xff;
+	_npf_aystar.user_path = &result;
+
+	/* Initialize target */
+	_npf_aystar.user_target = target;
+
+	/* Initialize user_data */
+	_npf_aystar.user_data[NPF_TYPE] = type;
+
+	/* GO! */
+	r = AyStarMain_Main(&_npf_aystar);
+	assert(r != AYSTAR_STILL_BUSY);
+
+	if (result.best_bird_dist != 0) {
+		if (target) {
+			DEBUG(misc, 1) ("NPF: Could not find route to 0x%x from 0x%x.", target->dest_coords, start1->tile);
+		} else {
+			/* Assumption: target == NULL, so we are looking for a depot */
+			DEBUG(misc, 1) ("NPF: Could not find route to a depot from 0x%x.", start1->tile);
+		}
+
+	}
+	return result;
+}
+
+NPFFoundTargetData NPFRouteToStationOrTileTwoWay(TileIndex tile1, byte trackdir1, TileIndex tile2, byte trackdir2, NPFFindStationOrTileData* target, TransportType type) {
+	AyStarNode start1;
+	AyStarNode start2;
+
+	start1.tile = tile1;
+	start2.tile = tile2;
+	start1.direction = trackdir1;
+	start2.direction = trackdir2;
+
+	return NPFRouteInternal(&start1, &start2, target, NPFFindStationOrTile, NPFCalcStationOrTileHeuristic, type);
+}
+
+NPFFoundTargetData NPFRouteToStationOrTile(TileIndex tile, byte trackdir, NPFFindStationOrTileData* target, TransportType type) {
+	AyStarNode start;
+
+	assert(tile != 0);
+
+	start.tile = tile;
+	start.direction = trackdir;
+	/* We set this in case the target is also the start tile, we will just
+	 * return a not found then */
+	start.user_data[NPF_TRACKDIR_CHOICE] = 0xff;
+
+	return NPFRouteInternal(&start, NULL, target, NPFFindStationOrTile, NPFCalcStationOrTileHeuristic, type);
+}
+
+NPFFoundTargetData NPFRouteToDepotBreadthFirst(TileIndex tile, byte trackdir, TransportType type) {
+	AyStarNode start;
+
+	start.tile = tile;
+	start.direction = trackdir;
+	/* We set this in case the target is also the start tile, we will just
+	 * return a not found then */
+	start.user_data[NPF_TRACKDIR_CHOICE] = 0xff;
+
+	/* perform a breadth first search. Target is NULL,
+	 * since we are just looking for any depot...*/
+	return NPFRouteInternal(&start, NULL, NULL, NPFFindDepot, NPFCalcZero, type);
+}
+
+NPFFoundTargetData NPFRouteToDepotTrialError(TileIndex tile, byte trackdir, TransportType type) {
+	/* Okay, what we're gonna do. First, we look at all depots, calculate
+	 * the manhatten distance to get to each depot. We then sort them by
+	 * distance. We start by trying to plan a route to the closest, then
+	 * the next closest, etc. We stop when the best route we have found so
+	 * far, is shorter than the manhattan distance. This will obviously
+	 * always find the closest depot. It will probably be most efficient
+	 * for ships, since the heuristic will not be to far off then. I hope.
+	 */
+	Queue depots;
+	uint i;
+	TileType tiletype = 0;
+	int r;
+	NPFFoundTargetData best_result;
+	NPFFoundTargetData result;
+	NPFFindStationOrTileData target;
+	AyStarNode start;
+	Depot* current;
+
+
+	/* This is a little ugly, but it works :-S */
+	if (type == TRANSPORT_ROAD)
+		tiletype = MP_STREET;
+	else if (type == TRANSPORT_RAIL)
+		tiletype = MP_RAILWAY;
+	else if (type == TRANSPORT_WATER)
+		tiletype = MP_WATER;
+	else
+		assert(0);
+
+	init_InsSort(&depots);
+	/* Okay, let's find all depots that we can use first */
+	for (i=0;i<lengthof(_depots);i++) {
+		int depot_tile = _depots[i].xy;
+		if (IsTileType(depot_tile, tiletype))
+			depots.push(&depots, &_depots[i], DistanceManhattan(tile, depot_tile));
+
+	}
+
+	/* Now, let's initialise the aystar */
+
+	/* Initialize procs */
+	_npf_aystar.CalculateH = NPFCalcStationOrTileHeuristic;
+	_npf_aystar.EndNodeCheck = NPFFindStationOrTile;
+	_npf_aystar.FoundEndNode = NPFSaveTargetData;
+	_npf_aystar.GetNeighbours = NPFFollowTrack;
+	if (type == TRANSPORT_RAIL)
+		_npf_aystar.CalculateG = NPFRailPathCost;
+	else if (type == TRANSPORT_ROAD)
+		_npf_aystar.CalculateG = NPFRoadPathCost;
+	else if (type == TRANSPORT_WATER)
+		_npf_aystar.CalculateG = NPFWaterPathCost;
+	else
+		assert(0);
+
+	/* Initialize target */
+	target.station_index = -1; /* We will initialize dest_coords inside the loop below */
+	_npf_aystar.user_target = &target;
+
+	/* Initialize user_data */
+	_npf_aystar.user_data[NPF_TYPE] = type;
+
+	/* Initialize Start Node */
+	start.tile = tile;
+	start.direction = trackdir; /* We will initialize user_data inside the loop below */
+
+	/* Initialize Result */
+	_npf_aystar.user_path = &result;
+	best_result.best_path_dist = (uint)-1;
+
+	/* Just iterate the depots in order of increasing distance */
+	while ((current = depots.pop(&depots))) {
+		/* Check to see if we already have a path shorter than this
+		 * depot's manhattan distance. Hack: We call DistanceManhattan
+		 * again, we should probably modify the queue to give us that
+		 * value... */
+		if ( DistanceManhattan(tile, current->xy * NPF_TILE_LENGTH) > best_result.best_path_dist)
+			break;
+
+		/* Initialize Start Node */
+		/* We set this in case the target is also the start tile, we will just
+		 * return a not found then */
+		start.user_data[NPF_TRACKDIR_CHOICE] = 0xff;
+		start.user_data[NPF_NODE_FLAGS] = 0;
+		_npf_aystar.addstart(&_npf_aystar, &start);
+
+		/* Initialize result */
+		result.best_bird_dist = (uint)-1;
+		result.best_path_dist = (uint)-1;
+		result.best_trackdir = 0xff;
+
+		/* Initialize target */
+		target.dest_coords = current->xy;
+
+		/* GO! */
+		r = AyStarMain_Main(&_npf_aystar);
+		assert(r != AYSTAR_STILL_BUSY);
+
+		/* This depot is closer */
+		if (result.best_path_dist < best_result.best_path_dist)
+			best_result = result;
+	}
+	if (result.best_bird_dist != 0) {
+		DEBUG(misc, 1) ("NPF: Could not find route to any depot from 0x%x.", tile);
+	}
+	return best_result;
+}
+
+void InitializeNPF(void)
+{
+		init_AyStar(&_npf_aystar, NTPHash, 1024);
+		_npf_aystar.loops_per_tick = 0;
+		_npf_aystar.max_path_cost = 0;
+		_npf_aystar.max_search_nodes = 0;
+		/*
+		init_AyStar(&_train_find_station, NTPHash, 1024);
+		init_AyStar(&_train_find_depot, NTPHash, 1024);
+		init_AyStar(&_road_find_station, NTPHash, 1024);
+		init_AyStar(&_road_find_depot, NTPHash, 1024);
+
+		_train_find_station.loops_per_tick = 0;
+		_train_find_depot.loops_per_tick = 0;
+		_road_find_station.loops_per_tick = 0;
+		_road_find_depot.loops_per_tick = 0;
+
+		_train_find_station.max_path_cost = 0;
+		_train_find_depot.max_path_cost = 0;
+		_road_find_station.max_path_cost = 0;
+		_road_find_depot.max_path_cost = 0;
+
+		_train_find_station.max_search_nodes = 0;
+		_train_find_depot.max_search_nodes = 0;
+		_road_find_station.max_search_nodes = 0;
+		_road_find_depot.max_search_nodes = 0;
+
+		_train_find_station.CalculateG = NPFRailPathCost;
+		_train_find_depot.CalculateG = NPFRailPathCost;
+		_road_find_station.CalculateG = NPFRoadPathCost;
+		_road_find_depot.CalculateG = NPFRoadPathCost;
+
+		_train_find_station.CalculateH = NPFCalcStationHeuristic;
+		_train_find_depot.CalculateH = NPFCalcStationHeuristic;
+		_road_find_station.CalculateH = NPFCalcStationHeuristic;
+		_road_find_depot.CalculateH = NPFCalcStationHeuristic;
+
+		_train_find_station.EndNodeCheck = NPFFindStationOrTile;
+		_train_find_depot.EndNodeCheck = NPFFindStationOrTile;
+		_road_find_station.EndNodeCheck = NPFFindStationOrTile;
+		_road_find_depot.EndNodeCheck = NPFFindStationOrTile;
+
+		_train_find_station.FoundEndNode = NPFSaveTargetData;
+		_train_find_depot.FoundEndNode = NPFSaveTargetData;
+		_road_find_station.FoundEndNode = NPFSaveTargetData;
+		_road_find_depot.FoundEndNode = NPFSaveTargetData;
+
+		_train_find_station.GetNeighbours = NPFFollowTrack;
+		_train_find_depot.GetNeighbours = NPFFollowTrack;
+		_road_find_station.GetNeighbours = NPFFollowTrack;
+		_road_find_depot.GetNeighbours = NPFFollowTrack;
+		*/
+}
+
+void NPFFillWithOrderData(NPFFindStationOrTileData* fstd, Vehicle* v) {
+	/* Ships don't really reach their stations, but the tile in front. So don't
+	 * save the station id for ships. For roadvehs we don't store it either,
+	 * because multistop depends on vehicles actually reaching the exact
+	 * dest_tile, not just any stop of that station.
+	 * So only for train orders to stations we fill fstd->station_index, for all
+	 * others only dest_coords */
+	if ((v->current_order.type) == OT_GOTO_STATION && v->type == VEH_Train) {
+		fstd->station_index = v->current_order.station;
+		/* Let's take the center of the station as our target tile for trains */
+		Station* st = GetStation(v->current_order.station);
+		TileIndexDiffC center = {st->trainst_w/2, st->trainst_h/2};
+		fstd->dest_coords = TILE_ADD(st->train_tile, ToTileIndexDiff(center));
+	} else {
+		fstd->dest_coords = v->dest_tile;
+		fstd->station_index = -1;
+	}
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/npf.h	Mon Jan 31 11:23:10 2005 +0000
@@ -0,0 +1,128 @@
+#ifndef NPF_H
+#define NPF_H
+
+#include "ttd.h"
+#include "aystar.h"
+#include "vehicle.h"
+
+//#define NPF_DEBUG
+//#define NPF_MARKROUTE //Mark the routes considered by the pathfinder by
+//mowing grass
+
+typedef struct NPFFindStationOrTileData { /* Meant to be stored in AyStar.targetdata */
+	TileIndex dest_coords; /* An indication of where the station is, for heuristic purposes, or the target tile */
+	int station_index; /* station index we're heading for, or -1 when we're heading for a tile */
+} NPFFindStationOrTileData;
+
+enum { /* Indices into AyStar.userdata[] */
+	NPF_TYPE = 0, /* Contains an TransportTypes value */
+};
+
+enum { /* Indices into AyStarNode.userdata[] */
+	NPF_TRACKDIR_CHOICE = 0, /* The trackdir chosen to get here */
+	NPF_NODE_FLAGS,
+};
+enum { /* Flags for AyStarNode.userdata[NPF_NODE_FLAGS]*/
+	NPF_FLAG_SEEN_SIGNAL = 1, /* Used to mark that a signal was seen on the way, for rail only */
+	NPF_FLAG_REVERSE = 2, /* Used to mark that this node was reached from the second start node, if applicable */
+};
+
+typedef struct NPFFoundTargetData { /* Meant to be stored in AyStar.userpath */
+	uint best_bird_dist; /* The best heuristic found. Is 0 if the target was found */
+	uint best_path_dist; /* The shortest path. Is (uint)-1 if no path is found */
+	byte best_trackdir; /* The trackdir that leads to the shortes path/closest birds dist */
+	AyStarNode node; /* The node within the target the search led us to */
+} NPFFoundTargetData;
+
+/* These functions below are _not_ re-entrant, in favor of speed! */
+
+/* Will search from the given tile and direction, for a route to the given
+ * station for the given transport type. See the declaration of
+ * NPFFoundTargetData above for the meaning of the result. */
+NPFFoundTargetData NPFRouteToStationOrTile(TileIndex tile, byte trackdir, NPFFindStationOrTileData* target, TransportType type);
+/* Will search as above, but with two start nodes, the second being the
+ * reverse. Look at the NPF_NODE_REVERSE flag in the result node to see which
+ * direction was taken */
+NPFFoundTargetData NPFRouteToStationOrTileTwoWay(TileIndex tile1, byte trackdir1, TileIndex tile2, byte trackdir2, NPFFindStationOrTileData* target, TransportType type);
+
+/* Will search a route to the closest depot. */
+
+/* Search using breadth first. Good for little track choice and inaccurate
+ * heuristic, such as railway/road */
+NPFFoundTargetData NPFRouteToDepotBreadthFirst(TileIndex tile, byte trackdir, TransportType type);
+/* Search by trying each depot in order of Manhattan Distance. Good for lots
+ * of choices and accurate heuristics, such as water */
+NPFFoundTargetData NPFRouteToDepotTrialError(TileIndex tile, byte trackdir, TransportType type);
+
+void NPFFillWithOrderData(NPFFindStationOrTileData* fstd, Vehicle* v);
+
+/*
+ * Some tables considering tracks, directions and signals.
+ * XXX: Better place to but these?
+ */
+
+/**
+ * Maps a trackdir to the bit that stores its status in the map arrays, in the
+ * direction along with the trackdir.
+ */
+const byte _signal_along_trackdir[14];
+
+/**
+ * Maps a trackdir to the bit that stores its status in the map arrays, in the
+ * direction against the trackdir.
+ */
+const byte _signal_against_trackdir[14];
+
+/**
+ * Maps a trackdir to the trackdirs that can be reached from it (ie, when
+ * entering the next tile.
+ */
+const uint16 _trackdir_reaches_trackdirs[14];
+
+/**
+ * Maps a trackdir to all trackdirs that make 90 deg turns with it.
+ */
+const uint16 _trackdir_crosses_trackdirs[14];
+
+/**
+ * Maps a track to all tracks that make 90 deg turns with it.
+ */
+const byte _track_crosses_tracks[6];
+
+/**
+ * Maps a trackdir to the (4-way) direction the tile is exited when following
+ * that trackdir.
+ */
+const byte _trackdir_to_exitdir[14];
+
+/**
+ * Maps a track and an (4-way) dir to the trackdir that represents the track
+ * with the exit in the given direction.
+ */
+const byte _track_exitdir_to_trackdir[6][4];
+
+/**
+ * Maps a track and a full (8-way) direction to the trackdir that represents
+ * the track running in the given direction.
+ */
+const byte _track_direction_to_trackdir[6][8];
+
+/**
+ * Maps a (4-way) direction to the diagonal track that runs in that
+ * direction.
+ */
+const byte _dir_to_diag_trackdir[4];
+
+/**
+ * Maps a (4-way) direction to the reverse.
+ */
+const byte _reverse_dir[4];
+
+/**
+ * Maps a trackdir to the reverse trackdir.
+ */
+const byte _reverse_trackdir[14];
+
+#define REVERSE_TRACKDIR(trackdir) (trackdir ^ 0x8)
+
+#endif // NPF_H

--- a/order_cmd.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/order_cmd.c	Mon Jan 31 11:23:10 2005 +0000
@@ -136,9 +136,11 @@
 	if (v->num_orders >= 40)
 		return_cmd_error(STR_8832_TOO_MANY_ORDERS);
 
-	/* For ships, make sure that the station is not too far away from the previous destination. */
+	/* For ships, make sure that the station is not too far away from the
+	 * previous destination, for human players with new pathfinding disabled */
 	if (v->type == VEH_Ship && IS_HUMAN_PLAYER(v->owner) &&
-		sel != 0 && GetVehicleOrder(v, sel - 1)->type == OT_GOTO_STATION) {
+		sel != 0 && GetVehicleOrder(v, sel - 1)->type == OT_GOTO_STATION
+		&& !_patches.new_pathfinding_all) {
 
 		int dist = DistanceManhattan(
 			GetStation(GetVehicleOrder(v, sel - 1)->station)->xy,

--- a/pathfind.h	Mon Jan 31 11:03:23 2005 +0000
+++ b/pathfind.h	Mon Jan 31 11:23:10 2005 +0000
@@ -1,6 +1,9 @@
 #ifndef PATHFIND_H
 #define PATHFIND_H
 
+//#define PF_BENCH // perform simple benchmarks on the train pathfinder (not
+//supported on all archs)
+
 typedef struct TrackPathFinder TrackPathFinder;
 typedef bool TPFEnumProc(uint tile, void *data, int track, uint length, byte *state);
 typedef void TPFAfterProc(TrackPathFinder *tpf);

--- a/queue.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/queue.c	Mon Jan 31 11:23:10 2005 +0000
@@ -420,7 +420,7 @@
 	q->data.binaryheap.size = 0;
 	// We malloc memory in block of BINARY_HEAP_BLOCKSIZE
 	//   It autosizes when it runs out of memory
-	q->data.binaryheap.elements = calloc(1, ((max_size - 1) / BINARY_HEAP_BLOCKSIZE) + 1);
+	q->data.binaryheap.elements = calloc(1, ((max_size - 1) / BINARY_HEAP_BLOCKSIZE*sizeof(BinaryHeapNode)) + 1);
 	q->data.binaryheap.elements[0] = malloc(BINARY_HEAP_BLOCKSIZE * sizeof(BinaryHeapNode));
 	q->data.binaryheap.blocks = 1;
 	q->freeq = false;

--- a/rail_cmd.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/rail_cmd.c	Mon Jan 31 11:23:10 2005 +0000
@@ -2168,7 +2168,6 @@
 		ret = (m5 << 8) + m5;
 	} else
 		return 0;
-
 	return ret;
 }
 

--- a/road_cmd.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/road_cmd.c	Mon Jan 31 11:23:10 2005 +0000
@@ -9,7 +9,7 @@
 #include "player.h"
 #include "town.h"
 #include "gfx.h"
-#include "table/directions.h"
+#include "npf.h"
 #include "sound.h"
 
 /* When true, GetTrackStatus for roads will treat roads under reconstruction

--- a/roadveh_cmd.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/roadveh_cmd.c	Mon Jan 31 11:23:10 2005 +0000
@@ -10,6 +10,7 @@
 #include "news.h"
 #include "gfx.h"
 #include "pathfind.h"
+#include "npf.h"
 #include "player.h"
 #include "sound.h"
 
@@ -287,21 +288,33 @@
 {
 	uint tile = v->tile;
 	int i;
-	RoadFindDepotData rfdd;
 
 	if (v->u.road.state == 255) { tile = GetVehicleOutOfTunnelTile(v); }
 
-	rfdd.owner = v->owner;
-	rfdd.best_length = (uint)-1;
+	if (_patches.new_pathfinding_all) {
+		NPFFoundTargetData ftd;
+		/* See where we are now */
+		byte trackdir = _dir_to_diag_trackdir[(v->direction>>1)&3];
+		ftd = NPFRouteToDepotBreadthFirst(v->tile, trackdir, TRANSPORT_ROAD);
+		if (ftd.best_bird_dist == 0)
+			return GetDepotByTile(ftd.node.tile); /* Target found */
+		else
+			return -1; /* Target not found */
+		/* We do not search in two directions here, why should we? We can't reverse right now can we? */
+	} else {
+		RoadFindDepotData rfdd;
+		rfdd.owner = v->owner;
+		rfdd.best_length = (uint)-1;
 
-	/* search in all directions */
-	for(i=0; i!=4; i++)
-		FollowTrack(tile, 0x2000 | TRANSPORT_ROAD, i, (TPFEnumProc*)EnumRoadSignalFindDepot, NULL, &rfdd);
+		/* search in all directions */
+		for(i=0; i!=4; i++)
+			FollowTrack(tile, 0x2000 | TRANSPORT_ROAD, i, (TPFEnumProc*)EnumRoadSignalFindDepot, NULL, &rfdd);
 
-	if (rfdd.best_length == (uint)-1)
-		return -1;
+		if (rfdd.best_length == (uint)-1)
+			return -1;
 
-	return GetDepotByTile(rfdd.tile);
+		return GetDepotByTile(rfdd.tile);
+	}
 }
 
 /*  Send a road vehicle to the nearest depot
@@ -1011,7 +1024,7 @@
 
 // Returns direction to choose
 // or -1 if the direction is currently blocked
-static int RoadFindPathToDest(Vehicle *v, uint tile, int direction)
+static int RoadFindPathToDest(Vehicle *v, uint tile, int enterdir)
 {
 #define return_track(x) {best_track = x; goto found_best_track; }
 
@@ -1055,66 +1068,95 @@
 	 */
 
 	/* remove unreachable tracks */
-	bitmask &= _road_veh_fp_ax_and[direction];
+	bitmask &= _road_veh_fp_ax_and[enterdir];
 	if (bitmask == 0) {
-		// reverse
-		return_track(_road_reverse_table[direction]);
+		/* No reachable tracks, so we'll reverse */
+		return_track(_road_reverse_table[enterdir]);
 	}
 
 	if (v->u.road.reverse_ctr != 0) {
+		/* What happens here?? */
 		v->u.road.reverse_ctr = 0;
 		if (v->tile != (TileIndex)tile) {
-			return_track(_road_reverse_table[direction]);
+			return_track(_road_reverse_table[enterdir]);
 		}
 	}
 
 	desttile = v->dest_tile;
 	if (desttile == 0) {
-		// Pick a random direction
+		// Pick a random track
 		return_track(PickRandomBit(bitmask));
 	}
 
-	// Only one direction to choose between?
-	if (!(bitmask & (bitmask - 1))) {
+	// Only one track to choose between?
+	if (!(KillFirstBit2x64(bitmask))) {
 		return_track(FindFirstBit2x64(bitmask));
 	}
 
-	if (IsTileType(desttile, MP_STREET)) {
-		m5 = _map5[desttile];
-		if ((m5&0xF0) == 0x20)
-			goto do_it;
-	} else if (IsTileType(desttile, MP_STATION)) {
-		m5 = _map5[desttile];
-		if (IS_BYTE_INSIDE(m5, 0x43, 0x4B)) {
-			m5 -= 0x43;
+	if (_patches.new_pathfinding_all) {
+		NPFFindStationOrTileData fstd;
+		NPFFoundTargetData ftd;
+		byte trackdir;
+
+		NPFFillWithOrderData(&fstd, v);
+		trackdir = _dir_to_diag_trackdir[enterdir];
+		//debug("Finding path. Enterdir: %d, Trackdir: %d", enterdir, trackdir);
+
+		ftd = NPFRouteToStationOrTile(tile - TileOffsByDir(enterdir), trackdir, &fstd, TRANSPORT_ROAD);
+		if (ftd.best_bird_dist != 0 || ftd.best_trackdir == 0xff) {
+			/* Not found, just do something, or we are already there */
+			//TODO: maybe display error?
+			//TODO: go straight ahead if possible?
+			return_track(FindFirstBit2x64(bitmask));
+		} else {
+			return_track(ftd.best_trackdir);
+		}
+	} else {
+		if (IsTileType(desttile, MP_STREET)) {
+			m5 = _map5[desttile];
+			if ((m5&0xF0) == 0x20)
+				/* We are heading for a Depot */
+				goto do_it;
+		} else if (IsTileType(desttile, MP_STATION)) {
+			m5 = _map5[desttile];
+			if (IS_BYTE_INSIDE(m5, 0x43, 0x4B)) {
+				/* We are heading for a station */
+				m5 -= 0x43;
 do_it:;
-			desttile += TileOffsByDir(m5 & 3);
-			if (desttile == tile && bitmask&_road_pf_table_3[m5&3]) {
-				return_track(FindFirstBit2x64(bitmask&_road_pf_table_3[m5&3]));
+				/* When we are heading for a depot or station, we just
+				 * pretend we are heading for the tile in front, we'll
+				 * see from there */
+				desttile += TileOffsByDir(m5 & 3);
+				if (desttile == tile && bitmask&_road_pf_table_3[m5&3]) {
+					/* If we are already in front of the
+					 * station/depot and we can get in from here,
+					 * we enter */
+					return_track(FindFirstBit2x64(bitmask&_road_pf_table_3[m5&3]));
+				}
 			}
 		}
-	}
-	// do pathfind
-	frd.dest = desttile;
+		// do pathfind
+		frd.dest = desttile;
 
-	best_track = -1;
-	best_dist = (uint)-1;
-	best_maxlen = (uint)-1;
-	i = 0;
-	do {
-		if (bitmask & 1) {
-			if (best_track == -1) best_track = i; // in case we don't find the path, just pick a direction
-			frd.maxtracklen = (uint)-1;
-			frd.mindist = (uint)-1;
-			FollowTrack(tile, 0x3000 | TRANSPORT_ROAD, _road_pf_directions[i], (TPFEnumProc*)EnumRoadTrackFindDist, NULL, &frd);
+		best_track = -1;
+		best_dist = (uint)-1;
+		best_maxlen = (uint)-1;
+		i = 0;
+		do {
+			if (bitmask & 1) {
+				if (best_track == -1) best_track = i; // in case we don't find the path, just pick a track
+				frd.maxtracklen = (uint)-1;
+				frd.mindist = (uint)-1;
+				FollowTrack(tile, 0x3000 | TRANSPORT_ROAD, _road_pf_directions[i], (TPFEnumProc*)EnumRoadTrackFindDist, NULL, &frd);
 
-			if (frd.mindist < best_dist || (frd.mindist==best_dist && frd.maxtracklen < best_maxlen)) {
-				best_dist = frd.mindist;
-				best_maxlen = frd.maxtracklen;
-				best_track = i;
+				if (frd.mindist < best_dist || (frd.mindist==best_dist && frd.maxtracklen < best_maxlen)) {
+					best_dist = frd.mindist;
+					best_maxlen = frd.maxtracklen;
+					best_track = i;
+				}
 			}
-		}
-	} while (++i,(bitmask>>=1) != 0);
+		} while (++i,(bitmask>>=1) != 0);
+	}
 
 found_best_track:;
 
@@ -1301,6 +1343,7 @@
 
 again:
 		if ((dir & 7) >= 6) {
+			/* Turning around */
 			tile = v->tile;
 		}
 

--- a/settings.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/settings.c	Mon Jan 31 11:23:10 2005 +0000
@@ -823,6 +823,33 @@
 
 	{"window_snap_radius",  SDT_UINT8,  (void*)10,    &_patches.window_snap_radius,   NULL},
 
+	/* New Path Finding */
+	{"new_pathfinding_all",	SDT_BOOL,		(void*)false, &_patches.new_pathfinding_all,	NULL},
+
+	/* When a red signal is encountered, a small detour can be made around
+	 * it. This specifically occurs when a track is doubled, in which case
+	 * the detour is typically 2 tiles. It is also often used at station
+	 * entrances, when there is a choice of multiple platforms. If we take
+	 * a typical 4 platform station, the detour is 4 tiles. To properly
+	 * support larger stations we increase this value.
+	 * We want to prevent that trains that want to leave at one side of a
+	 * station, leave through the other side, turn around, enter the
+	 * station on another platform and exit the station on the right side
+	 * again, just because the sign at the right side was red. If we take
+	 * a typical 5 length station, this detour is 10 or 11 tiles (not
+	 * sure), so we set the default penalty at 10 (the station tile
+	 * penalty will further prevent this */
+	{"npf_rail_firstred_penalty",		SDT_UINT32, (void*)(10 * NPF_TILE_LENGTH),	&_patches.npf_rail_firstred_penalty,		NULL},
+	/* When a train plans a route over a station tile, this penalty is
+	 * applied. We want that trains plan a route around a typical, 4x5
+	 * station, which means two tiles to the right, and two tiles back to
+	 * the left around it, or 5 tiles of station through it. If we assign
+	 * a penalty of 1 tile for every station tile passed, the route will
+	 * be around it.
+	 */
+	{"npf_rail_station_penalty",		SDT_UINT32, (void*)(1 * NPF_TILE_LENGTH),		&_patches.npf_rail_station_penalty, 		NULL},
+	{"npf_rail_slope_penalty",			SDT_UINT32, (void*)(1 * NPF_TILE_LENGTH),		&_patches.npf_rail_slope_penalty,				NULL},
+
 	{"autorenew",						SDT_BOOL,		(void*)false,	&_patches.autorenew,						NULL},
 	{"autorenew_months",		SDT_INT16,	(void*)-6,		&_patches.autorenew_months,			NULL},
 	{"autorenew_money",			SDT_INT32,	(void*)100000,&_patches.autorenew_money,			NULL},
@@ -864,6 +891,7 @@
 	{"nonuniform_stations",	SDT_BOOL,		(void*)true,	&_patches.nonuniform_stations,	NULL},
 	{"always_small_airport",SDT_BOOL,		(void*)false,	&_patches.always_small_airport,	NULL},
 	{"realistic_acceleration",SDT_BOOL, (void*)false,	&_patches.realistic_acceleration,	NULL},
+	{"forbid_90_deg",				SDT_BOOL, 	(void*)false, &_patches.forbid_90_deg,					NULL},
 	{"improved_load",				SDT_BOOL,		(void*)false,	&_patches.improved_load,				NULL},
 
 	{"max_trains",					SDT_UINT8,	(void*)80,		&_patches.max_trains,						NULL},

--- a/settings_gui.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/settings_gui.c	Mon Jan 31 11:23:10 2005 +0000
@@ -640,11 +640,13 @@
 
 static const PatchEntry _patches_vehicles[] = {
 	{PE_BOOL,		0, STR_CONFIG_PATCHES_REALISTICACCEL,		"realistic_acceleration", &_patches.realistic_acceleration,		0,  0,  0, NULL},
-	{PE_BOOL,		0, STR_CONFIG_PATCHES_MAMMOTHTRAINS,		"mammoth_trains", &_patches.mammoth_trains,						0,  0,  0, NULL},
-	{PE_BOOL,		0, STR_CONFIG_PATCHES_GOTODEPOT,				"goto_depot", &_patches.gotodepot,								0,  0,  0, NULL},
-	{PE_BOOL,		0, STR_CONFIG_PATCHES_ROADVEH_QUEUE,		"roadveh_queue", &_patches.roadveh_queue,						0,  0,  0, NULL},
-	{PE_BOOL,		0, STR_CONFIG_PATCHES_NEW_DEPOT_FINDING,"depot_finding", &_patches.new_depot_finding,				0,  0,  0, NULL},
+	{PE_BOOL,		0, STR_CONFIG_PATCHES_FORBID_90_DEG,		"forbid_90_deg", 		&_patches.forbid_90_deg,						0,  0,  0, NULL},
+	{PE_BOOL,		0, STR_CONFIG_PATCHES_MAMMOTHTRAINS,		"mammoth_trains", 	&_patches.mammoth_trains,						0,  0,  0, NULL},
+	{PE_BOOL,		0, STR_CONFIG_PATCHES_GOTODEPOT,				"goto_depot", 			&_patches.gotodepot,								0,  0,  0, NULL},
+	{PE_BOOL,		0, STR_CONFIG_PATCHES_ROADVEH_QUEUE,		"roadveh_queue", 		&_patches.roadveh_queue,						0,  0,  0, NULL},
+	{PE_BOOL,		0, STR_CONFIG_PATCHES_NEW_DEPOT_FINDING,"depot_finding", 		&_patches.new_depot_finding,				0,  0,  0, NULL},
 	{PE_BOOL,		0, STR_CONFIG_PATCHES_NEW_TRAIN_PATHFIND,"new_pathfinding", &_patches.new_pathfinding,	0,  0,  0, NULL},
+	{PE_BOOL,		0, STR_CONFIG_PATCHES_NEW_PATHFINDING_ALL, "new_pathfinding_all", &_patches.new_pathfinding_all,		0,  0,  0, NULL},
 
 	{PE_BOOL,		PF_PLAYERBASED, STR_CONFIG_PATCHES_WARN_INCOME_LESS, "train_income_warn", &_patches.train_income_warn,				0,  0,  0, NULL},
 	{PE_UINT8,	PF_MULTISTRING | PF_PLAYERBASED, STR_CONFIG_PATCHES_ORDER_REVIEW, "order_review_system", &_patches.order_review_system,0,2,  1, NULL},

--- a/ship_cmd.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/ship_cmd.c	Mon Jan 31 11:23:10 2005 +0000
@@ -13,6 +13,7 @@
 #include "gui.h"
 #include "player.h"
 #include "sound.h"
+#include "npf.h"
 
 static const uint16 _ship_sprites[] = {0x0E5D, 0x0E55, 0x0E65, 0x0E6D};
 static const byte _ship_sometracks[4] = {0x19, 0x16, 0x25, 0x2A};
@@ -70,17 +71,26 @@
 	byte owner = v->owner;
 	uint tile2 = v->tile;
 
-	for(i=0; i!=lengthof(_depots); i++) {
-		tile = _depots[i].xy;
-		if (IsTileType(tile, MP_WATER) && _map_owner[tile] == owner) {
-			dist = DistanceManhattan(tile, tile2);
-			if (dist < best_dist) {
-				best_dist = dist;
-				best_depot = i;
+	if (_patches.new_pathfinding_all) {
+		NPFFoundTargetData ftd;
+		byte trackdir = _track_direction_to_trackdir[FIND_FIRST_BIT(v->u.ship.state)][v->direction];
+		ftd = NPFRouteToDepotTrialError(v->tile, trackdir, TRANSPORT_ROAD);
+		if (ftd.best_bird_dist == 0)
+			best_depot = ftd.node.tile; /* Found target */
+		else
+			best_depot = -1; /* Did not find target */
+	} else {
+		for(i=0; i!=lengthof(_depots); i++) {
+			tile = _depots[i].xy;
+			if (IsTileType(tile, MP_WATER) && _map_owner[tile] == owner) {
+				dist = DistanceManhattan(tile, tile2);
+				if (dist < best_dist) {
+					best_dist = dist;
+					best_depot = i;
+				}
 			}
 		}
 	}
-
 	return best_depot;
 }
 
@@ -568,27 +578,55 @@
 	return best_bird_dist;
 }
 
-static int ChooseShipTrack(Vehicle *v, uint tile, int dir, uint tracks)
+/* returns the track to choose on the next tile, or -1 when it's better to
+ * reverse. The tile given is the tile we are about to enter, enterdir is the
+ * direction in which we are entering the tile */
+static int ChooseShipTrack(Vehicle *v, uint tile, int enterdir, uint tracks)
 {
-	uint b;
-	uint tot_dist, dist;
-	int track;
-	uint tile2;
+	assert(enterdir>=0 && enterdir<=3);
 
-	assert(dir>=0 && dir<=3);
-	tile2 = TILE_ADD(tile, -TileOffsByDir(dir));
-	dir ^= 2;
-	tot_dist = (uint)-1;
-	b = GetTileShipTrackStatus(tile2) & _ship_sometracks[dir] & v->u.ship.state;
-	if (b != 0) {
-		dist = FindShipTrack(v, tile2, dir, b, tile, &track);
-		if (dist != (uint)-1)
-			tot_dist = dist + 1;
+	if (_patches.new_pathfinding_all) {
+		NPFFindStationOrTileData fstd;
+		NPFFoundTargetData ftd;
+		uint src_tile = TILE_ADD(tile, TileOffsByDir(_reverse_dir[enterdir]));
+		byte track = FIND_FIRST_BIT(v->u.ship.state);
+		assert (KILL_FIRST_BIT(v->u.ship.state) == 0); /* Check that only one bit is set in state */
+		assert (v->u.ship.state != 0x80); /* Check that we are not in a depot */
+		assert (track < 6);
+
+		NPFFillWithOrderData(&fstd, v);
+
+		ftd = NPFRouteToStationOrTile(src_tile, _track_direction_to_trackdir[track][v->direction], &fstd, TRANSPORT_WATER);
+
+		if (ftd.best_bird_dist == 0 && ftd.best_trackdir != 0xff)
+			/* Found the target, and it is not our current tile */
+			return ftd.best_trackdir & 7; /* TODO: Wrapper function? */
+		else
+			return -1; /* Couldn't find target, reverse */
+			/* TODO: When the target is unreachable, the ship will keep reversing */
+	} else {
+		uint b;
+		uint tot_dist, dist;
+		int track;
+		uint tile2;
+
+		tile2 = TILE_ADD(tile, -TileOffsByDir(enterdir));
+		tot_dist = (uint)-1;
+
+		/* Let's find out how far it would be if we would reverse first */
+		b = GetTileShipTrackStatus(tile2) & _ship_sometracks[_reverse_dir[enterdir]] & v->u.ship.state;
+		if (b != 0) {
+			dist = FindShipTrack(v, tile2, _reverse_dir[enterdir], b, tile, &track);
+			if (dist != (uint)-1)
+				tot_dist = dist + 1;
+		}
+		/* And if we would not reverse? */
+		dist = FindShipTrack(v, tile, enterdir, tracks, 0, &track);
+		if (dist > tot_dist)
+			/* We could better reverse */
+			return -1;
+		return track;
 	}
-	dist = FindShipTrack(v, tile, dir^2, tracks, 0, &track);
-	if (dist > tot_dist)
-		return -1;
-	return track;
 }
 
 static const byte _new_vehicle_direction_table[11] = {

--- a/station.h	Mon Jan 31 11:03:23 2005 +0000
+++ b/station.h	Mon Jan 31 11:23:10 2005 +0000
@@ -2,6 +2,7 @@
 #define STATION_H
 
 #include "sprite.h"
+#include "tile.h"
 #include "vehicle.h"
 
 typedef struct GoodsEntry {
@@ -224,4 +225,19 @@
 RoadStop * GetPrimaryRoadStop(const Station *st, RoadStopType type);
 RoadStop * GetFirstFreeRoadStop( void );
 
+static inline bool IsTrainStationTile(uint tile) {
+	return IsTileType(tile, MP_STATION) && IS_BYTE_INSIDE(_map5[tile], 0, 8);
+}
+
+static inline bool IsRoadStationTile(uint tile) {
+	return IsTileType(tile, MP_STATION) && IS_BYTE_INSIDE(_map5[tile], 0x43, 0x4B);
+}
+
+/* Get's the direction the station exit points towards. Ie, returns 0 for a
+ * station with the exit NE. */
+static inline byte GetRoadStationDir(uint tile) {
+	assert(IsRoadStationTile(tile));
+	return (_map5[tile] - 0x43) & 3;
+}
+
 #endif /* STATION_H */

--- a/station_cmd.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/station_cmd.c	Mon Jan 31 11:23:10 2005 +0000
@@ -16,7 +16,7 @@
 #include "player.h"
 #include "airport.h"
 #include "sprite.h"
-#include "table/directions.h"
+#include "npf.h"
 
 // FIXME -- need to be embedded into Airport variable. Is dynamically
 // deducteable from graphics-tile array, so will not be needed
@@ -2277,10 +2277,6 @@
 	}
 }
 
-static inline bool IsTrainStationTile(uint tile) {
-	return IsTileType(tile, MP_STATION) && IS_BYTE_INSIDE(_map5[tile], 0, 8);
-}
-
 static const byte _enter_station_speedtable[12] = {
 	215, 195, 175, 155, 135, 115, 95, 75, 55, 35, 15, 0
 };

--- a/table/directions.h	Mon Jan 31 11:03:23 2005 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,8 +0,0 @@
-static const byte _dir_to_straight_trackdir[4] = {
-	0, 1, 8, 9,
-};
-
-static const byte _reverse_dir[4] = {
-//	3, 0, 1, 2
-	2, 3, 0, 1
-};

--- a/train_cmd.c	Mon Jan 31 11:03:23 2005 +0000
+++ b/train_cmd.c	Mon Jan 31 11:23:10 2005 +0000
@@ -6,6 +6,7 @@
 #include "vehicle.h"
 #include "command.h"
 #include "pathfind.h"
+#include "npf.h"
 #include "station.h"
 #include "table/train_cmd.h"
 #include "gfx.h"
@@ -25,16 +26,9 @@
 static const byte _vehicle_initial_y_fract[4] = {8,4,8,10};
 static const byte _state_dir_table[4] = { 0x20, 8, 0x10, 4 };
 
-static const byte _signal_onedir[14] = {
-	0x80, 0x80, 0x80, 0x20, 0x40, 0x10, 0, 0,
-	0x40, 0x40, 0x40, 0x10, 0x80, 0x20
-};
-
-static const byte _signal_otherdir[14] = {
-	0x40, 0x40, 0x40, 0x10, 0x80, 0x20, 0, 0,
-	0x80, 0x80, 0x80, 0x20, 0x40, 0x10
-};
-
+
+/* These two arrays are used for realistic acceleration. XXX: How should they
+ * be interpreted? */
 static const byte _curve_neighbours45[8][2] = {
 	{7, 1},
 	{0, 2},
@@ -1301,7 +1295,7 @@
 
 		// make sure the train doesn't run against a oneway signal
 		if ((_map5[tile] & 0xC0) == 0x40) {
-			if (!(_map3_lo[tile] & _signal_onedir[track]) && _map3_lo[tile] & _signal_otherdir[track])
+			if (!(_map3_lo[tile] & _signal_along_trackdir[track]) && _map3_lo[tile] & _signal_against_trackdir[track])
 				return true;
 		}
 	}
@@ -1328,7 +1322,16 @@
 
 	if (v->u.rail.track == 0x40) { tile = GetVehicleOutOfTunnelTile(v); }
 
-	if (!_patches.new_depot_finding) {
+	if (_patches.new_pathfinding_all) {
+		NPFFoundTargetData ftd;
+		byte trackdir = _track_direction_to_trackdir[FIND_FIRST_BIT(v->u.rail.track)][v->direction];
+		ftd = NPFRouteToDepotBreadthFirst(v->tile, trackdir, TRANSPORT_RAIL);
+		if (ftd.best_bird_dist == 0) {
+			/* Found target */
+			tfdd.tile = ftd.node.tile;
+			tfdd.best_length = ftd.best_path_dist;
+		}
+	} else if (!_patches.new_depot_finding) {
 		// search in all directions
 		for(i=0; i!=4; i++)
 			NewTrainPathfind(tile, i, (TPFEnumProc*)TrainFindDepotEnumProc, &tfdd, NULL);
@@ -1547,6 +1550,7 @@
 	return false;
 }
 
+/* Check for station tiles */
 typedef struct TrainTrackFollowerData {
 	TileIndex dest_coords;
 	int station_index; // station index we're heading for
@@ -1559,14 +1563,14 @@
 	if (IsTileType(tile, MP_RAILWAY) && (_map5[tile]&0xC0) == 0x40) {
 		// the tile has a signal
 		byte m3 = _map3_lo[tile];
-		if (!(m3 & _signal_onedir[track])) {
+		if (!(m3 & _signal_along_trackdir[track])) {
 			// if one way signal not pointing towards us, stop going in this direction.
-			if (m3 & _signal_otherdir[track])
+			if (m3 & _signal_against_trackdir[track])
 				return true;
-		} else if (_map2[tile] & _signal_onedir[track]) {
+		} else if (_map2[tile] & _signal_along_trackdir[track]) {
 			// green signal in our direction. either one way or two way.
 			*state = true;
-		} else if (m3 & _signal_otherdir[track]) {
+		} else if (m3 & _signal_against_trackdir[track]) {
 			// two way signal. unless we passed another green signal on the way,
 			// stop going in this direction.
 			if (!*state) return true;
@@ -1643,97 +1647,132 @@
 };
 
 static const byte _pick_track_table[6] = {1, 3, 2, 2, 0, 0};
+#if PF_BENCHMARK
+unsigned int rdtsc()
+{
+     unsigned int high, low;
+
+     __asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high));
+     return low;
+}
+#endif
+
 
 /* choose a track */
-static byte ChooseTrainTrack(Vehicle *v, uint tile, int direction, byte trackbits)
+static byte ChooseTrainTrack(Vehicle *v, uint tile, int enterdir, byte trackbits)
 {
 	TrainTrackFollowerData fd;
 	int bits = trackbits;
 	uint best_track;
-#if 0
+#if PF_BENCHMARK
 	int time = rdtsc();
 	static float f;
 #endif
 
 	assert( (bits & ~0x3F) == 0);
 
-	/* quick return in case only one possible direction is available */
+	/* quick return in case only one possible track is available */
 	if (KILL_FIRST_BIT(bits) == 0)
 		return FIND_FIRST_BIT(bits);
 
-	FillWithStationData(&fd, v);
-
-	if (_patches.new_pathfinding) {
-		fd.best_bird_dist = (uint)-1;
-		fd.best_track_dist = (uint)-1;
-		fd.best_track = 0xFF;
-		NewTrainPathfind(tile - TileOffsByDir(direction), direction, (TPFEnumProc*)TrainTrackFollower, &fd, NULL);
-
-//		printf("Train %d %s\n", v->unitnumber, fd.best_track_dist == -1 ? "NOTFOUND" : "FOUND");
-
-		if (fd.best_track == 0xff) {
-			// blaha
+	if (_patches.new_pathfinding_all) { /* Use a new pathfinding for everything */
+		NPFFindStationOrTileData fstd;
+		NPFFoundTargetData ftd;
+		byte trackdir;
+
+		NPFFillWithOrderData(&fstd, v);
+		/* The enterdir for the new tile, is the exitdir for the old tile */
+		trackdir = _track_exitdir_to_trackdir[FIND_FIRST_BIT(v->u.rail.track)][enterdir];
+		assert(trackdir != 0xff);
+
+		ftd = NPFRouteToStationOrTile(tile - TileOffsByDir(enterdir), trackdir, &fstd, TRANSPORT_RAIL);
+		if (ftd.best_bird_dist != 0 || ftd.best_trackdir == 0xff) {
+			/* Not found, or we are already there. Just do something */
+			//TODO: maybe display error?
+			//TODO: go straight ahead if possible?
 			best_track = FIND_FIRST_BIT(bits);
 		} else {
-			best_track = fd.best_track & 7;
+			/* Discard enterdir information, making it a normal track */
+			best_track = ftd.best_trackdir & 7; /* TODO: Wrapper function? */
 		}
 	} else {
-		int i, r;
-		uint best_bird_dist  = 0;
-		uint best_track_dist = 0;
-		byte train_dir = v->direction & 3;
-
-
-		best_track = -1;
-
-		do {
-			i = FIND_FIRST_BIT(bits);
-			bits = KILL_FIRST_BIT(bits);
-
+
+		FillWithStationData(&fd, v);
+
+		if (_patches.new_pathfinding) {
+			/* New train pathfinding */
 			fd.best_bird_dist = (uint)-1;
 			fd.best_track_dist = (uint)-1;
-
-			NewTrainPathfind(tile, _search_directions[i][direction], (TPFEnumProc*)TrainTrackFollower, &fd, NULL);
-			if (best_track != (uint)-1) {
-				if (best_track_dist == (uint)-1) {
-					if (fd.best_track_dist == (uint)-1) {
-						/* neither reached the destination, pick the one with the smallest bird dist */
-						if (fd.best_bird_dist > best_bird_dist) goto bad;
-						if (fd.best_bird_dist < best_bird_dist) goto good;
+			fd.best_track = 0xFF;
+			NewTrainPathfind(tile - TileOffsByDir(enterdir), enterdir, (TPFEnumProc*)TrainTrackFollower, &fd, NULL);
+
+	//		printf("Train %d %s\n", v->unitnumber, fd.best_track_dist == -1 ? "NOTFOUND" : "FOUND");
+
+			if (fd.best_track == 0xff) {
+				// blaha
+				best_track = FIND_FIRST_BIT(bits);
+			} else {
+				best_track = fd.best_track & 7;
+			}
+		} else {
+			/* Original pathfinding */
+			int i, r;
+			uint best_bird_dist  = 0;
+			uint best_track_dist = 0;
+			byte train_dir = v->direction & 3;
+
+
+			best_track = (uint)-1;
+
+			do {
+				i = FIND_FIRST_BIT(bits);
+				bits = KILL_FIRST_BIT(bits);
+
+				fd.best_bird_dist = (uint)-1;
+				fd.best_track_dist = (uint)-1;
+
+				NewTrainPathfind(tile, _search_directions[i][enterdir], (TPFEnumProc*)TrainTrackFollower, &fd, NULL);
+				if (best_track != (uint)-1) {
+					if (best_track_dist == (uint)-1) {
+						if (fd.best_track_dist == (uint)-1) {
+							/* neither reached the destination, pick the one with the smallest bird dist */
+							if (fd.best_bird_dist > best_bird_dist) goto bad;
+							if (fd.best_bird_dist < best_bird_dist) goto good;
+						} else {
+							/* we found the destination for the first time */
+							goto good;
+						}
 					} else {
-						/* we found the destination for the first time */
-						goto good;
-					}
-				} else {
-					if (fd.best_track_dist == (uint)-1) {
-						/* didn't find destination, but we've found the destination previously */
-						goto bad;
-					} else {
-						/* both old & new reached the destination, compare track length */
-						if (fd.best_track_dist > best_track_dist) goto bad;
-						if (fd.best_track_dist < best_track_dist) goto good;
+						if (fd.best_track_dist == (uint)-1) {
+							/* didn't find destination, but we've found the destination previously */
+							goto bad;
+						} else {
+							/* both old & new reached the destination, compare track length */
+							if (fd.best_track_dist > best_track_dist) goto bad;
+							if (fd.best_track_dist < best_track_dist) goto good;
+						}
 					}
+
+					/* if we reach this position, there's two paths of equal value so far.
+					 * pick one randomly. */
+					r = (byte)Random();
+					if (_pick_track_table[i] == train_dir) r += 80;
+					if (_pick_track_table[best_track] == train_dir) r -= 80;
+
+					if (r <= 127) goto bad;
 				}
-
-				/* if we reach this position, there's two paths of equal value so far.
-				 * pick one randomly. */
-				r = (byte)Random();
-				if (_pick_track_table[i] == train_dir) r += 80;
-				if (_pick_track_table[best_track] == train_dir) r -= 80;
-
-				if (r <= 127) goto bad;
-			}
-	good:;
-			best_track = i;
-			best_bird_dist = fd.best_bird_dist;
-			best_track_dist = fd.best_track_dist;
-	bad:;
-		} while (bits != 0);
-//		printf("Train %d %s\n", v->unitnumber, best_track_dist == -1 ? "NOTFOUND" : "FOUND");
-		assert(best_track != (uint)-1);
+		good:;
+				best_track = i;
+				best_bird_dist = fd.best_bird_dist;
+				best_track_dist = fd.best_track_dist;
+		bad:;
+			} while (bits != 0);
+	//		printf("Train %d %s\n", v->unitnumber, best_track_dist == -1 ? "NOTFOUND" : "FOUND");
+			assert(best_track != (uint)-1);
+		}
 	}
 
-#if 0
+#if PF_BENCHMARK
 	time = rdtsc() - time;
 	f = f * 0.99 + 0.01 * time;
 	printf("PF time = %d %f\n", time, f);
@@ -1766,49 +1805,74 @@
 
 	i = _search_directions[FIND_FIRST_BIT(v->u.rail.track)][v->direction>>1];
 
-	while(true) {
-		fd.best_bird_dist = (uint)-1;
-		fd.best_track_dist = (uint)-1;
-
-		NewTrainPathfind(v->tile, reverse ^ i, (TPFEnumProc*)TrainTrackFollower, &fd, NULL);
-
-		if (best_track != -1) {
-			if (best_bird_dist != 0) {
-				if (fd.best_bird_dist != 0) {
-					/* neither reached the destination, pick the one with the smallest bird dist */
-					if (fd.best_bird_dist > best_bird_dist) goto bad;
-					if (fd.best_bird_dist < best_bird_dist) goto good;
-				} else {
-					/* we found the destination for the first time */
-					goto good;
-				}
-			} else {
-				if (fd.best_bird_dist != 0) {
-					/* didn't find destination, but we've found the destination previously */
-					goto bad;
+	if (_patches.new_pathfinding_all) { /* Use a new pathfinding for everything */
+		NPFFindStationOrTileData fstd;
+		NPFFoundTargetData ftd;
+		byte trackdir, trackdir_rev;
+		Vehicle* last = GetLastVehicleInChain(v);
+
+		NPFFillWithOrderData(&fstd, v);
+
+		trackdir = _track_direction_to_trackdir[FIND_FIRST_BIT(v->u.rail.track)][v->direction];
+		trackdir_rev = REVERSE_TRACKDIR(_track_direction_to_trackdir[FIND_FIRST_BIT(last->u.rail.track)][last->direction]);
+		assert(trackdir != 0xff);
+		assert(trackdir_rev != 0xff);
+
+		ftd = NPFRouteToStationOrTileTwoWay(v->tile, trackdir, last->tile, trackdir_rev, &fstd, TRANSPORT_RAIL);
+		if (ftd.best_bird_dist != 0) {
+			/* We didn't find anything, just keep on going straight ahead */
+			reverse_best = false;
+		} else {
+			if (ftd.node.user_data[NPF_NODE_FLAGS] & NPF_FLAG_REVERSE)
+				reverse_best = true;
+			else
+				reverse_best = false;
+		}
+	} else {
+		while(true) {
+			fd.best_bird_dist = (uint)-1;
+			fd.best_track_dist = (uint)-1;
+
+			NewTrainPathfind(v->tile, reverse ^ i, (TPFEnumProc*)TrainTrackFollower, &fd, NULL);
+
+			if (best_track != -1) {
+				if (best_bird_dist != 0) {
+					if (fd.best_bird_dist != 0) {
+						/* neither reached the destination, pick the one with the smallest bird dist */
+						if (fd.best_bird_dist > best_bird_dist) goto bad;
+						if (fd.best_bird_dist < best_bird_dist) goto good;
+					} else {
+						/* we found the destination for the first time */
+						goto good;
+					}
 				} else {
-					/* both old & new reached the destination, compare track length */
-					if (fd.best_track_dist > best_track_dist) goto bad;
-					if (fd.best_track_dist < best_track_dist) goto good;
+					if (fd.best_bird_dist != 0) {
+						/* didn't find destination, but we've found the destination previously */
+						goto bad;
+					} else {
+						/* both old & new reached the destination, compare track length */
+						if (fd.best_track_dist > best_track_dist) goto bad;
+						if (fd.best_track_dist < best_track_dist) goto good;
+					}
 				}
+
+				/* if we reach this position, there's two paths of equal value so far.
+				 * pick one randomly. */
+				r = (byte)Random();
+				if (_pick_track_table[i] == (v->direction & 3)) r += 80;
+				if (_pick_track_table[best_track] == (v->direction & 3)) r -= 80;
+				if (r <= 127) goto bad;
 			}
-
-			/* if we reach this position, there's two paths of equal value so far.
-			 * pick one randomly. */
-			r = (byte)Random();
-			if (_pick_track_table[i] == (v->direction & 3)) r += 80;
-			if (_pick_track_table[best_track] == (v->direction & 3)) r -= 80;
-			if (r <= 127) goto bad;
+good:;
+			best_track = i;
+			best_bird_dist = fd.best_bird_dist;
+			best_track_dist = fd.best_track_dist;
+			reverse_best = reverse;
+bad:;
+			if (reverse != 0)
+				break;
+			reverse = 2;
 		}
-good:;
-		best_track = i;
-		best_bird_dist = fd.best_bird_dist;
-		best_track_dist = fd.best_track_dist;
-		reverse_best = reverse;
-bad:;
-		if (reverse != 0)
-			break;
-		reverse = 2;
 	}
 
 	return reverse_best != 0;
@@ -2331,7 +2395,7 @@
 	Vehicle *prev = NULL;
 	GetNewVehiclePosResult gp;
 	uint32 r, tracks,ts;
-	int dir, i;
+	int i, enterdir, newdir, dir;
 	byte chosen_dir;
 	byte chosen_track;
 	byte old_z;
@@ -2355,8 +2419,10 @@
 						return;
 
 					r = VehicleEnterTile(v, gp.new_tile, gp.x, gp.y);
-					if (r & 0x8)
+					if (r & 0x8) {
+						//debug("%x & 0x8", r);
 						goto invalid_rail;
+					}
 					if (r & 0x2) {
 						TrainEnterStation(v, r >> 8);
 						return;
@@ -2371,30 +2437,43 @@
 			} else {
 				/* A new tile is about to be entered. */
 
+				byte bits;
 				/* Determine what direction we're entering the new tile from */
 				dir = GetNewVehicleDirectionByTile(gp.new_tile, gp.old_tile);
-				assert(dir==1 || dir==3 || dir==5 || dir==7);
+				enterdir = dir >> 1;
+				assert(enterdir==0 || enterdir==1 || enterdir==2 || enterdir==3);
 
 				/* Get the status of the tracks in the new tile and mask
 				 * away the bits that aren't reachable. */
-				ts = GetTileTrackStatus(gp.new_tile, TRANSPORT_RAIL) & _reachable_tracks[dir >> 1];
+				ts = GetTileTrackStatus(gp.new_tile, TRANSPORT_RAIL) & _reachable_tracks[enterdir];
 
 				/* Combine the from & to directions.
 				 * Now, the lower byte contains the track status, and the byte at bit 16 contains
 				 * the signal status. */
 				tracks = ts|(ts >> 8);
-				if ( (byte) tracks == 0)
+				bits = tracks & 0xFF;
+				if (_patches.new_pathfinding_all && _patches.forbid_90_deg && prev == NULL)
+					/* We allow wagons to make 90 deg turns, because forbid_90_deg
+					 * can be switched on halfway a turn */
+					bits &= ~_track_crosses_tracks[FIND_FIRST_BIT(v->u.rail.track)];
+
+				if ( bits == 0) {
+					//debug("%x == 0", bits);
 					goto invalid_rail;
+				}
 
 				/* Check if the new tile contrains tracks that are compatible
 				 * with the current train, if not, bail out. */
-				if (!CheckCompatibleRail(v, gp.new_tile))
+				if (!CheckCompatibleRail(v, gp.new_tile)) {
+					//debug("!CheckCompatibleRail(%p, %x)", v, gp.new_tile);
 					goto invalid_rail;
+				}
 
 				if (prev == NULL) {
 					/* Currently the locomotive is active. Determine which one of the
 					 * available tracks to choose */
-					chosen_track = 1 << ChooseTrainTrack(v, gp.new_tile, dir>>1, (byte)tracks);
+					chosen_track = 1 << ChooseTrainTrack(v, gp.new_tile, enterdir, bits);
+					assert(chosen_track & tracks);
 
 					/* Check if it's a red signal and that force proceed is not clicked. */
 					if ( (tracks>>16)&chosen_track && v->u.rail.force_proceed == 0) goto red_light;
@@ -2402,7 +2481,7 @@
 					static byte _matching_tracks[8] = {0x30, 1, 0xC, 2, 0x30, 1, 0xC, 2};
 
 					/* The wagon is active, simply follow the prev vehicle. */
-					chosen_track = (byte)(_matching_tracks[GetDirectionToVehicle(prev, gp.x, gp.y)] & tracks);
+					chosen_track = (byte)(_matching_tracks[GetDirectionToVehicle(prev, gp.x, gp.y)] & bits);
 				}
 
 				/* make sure chosen track is a valid track */
@@ -2410,7 +2489,7 @@
 
 				/* Update XY to reflect the entrance to the new tile, and select the direction to use */
 				{
-					const byte *b = _initial_tile_subcoord[FIND_FIRST_BIT(chosen_track)][dir>>1];
+					const byte *b = _initial_tile_subcoord[FIND_FIRST_BIT(chosen_track)][enterdir];
 					gp.x = (gp.x & ~0xF) | b[0];
 					gp.y = (gp.y & ~0xF) | b[1];
 					chosen_dir = b[2];
@@ -2418,8 +2497,10 @@
 
 				/* Call the landscape function and tell it that the vehicle entered the tile */
 				r = VehicleEnterTile(v, gp.new_tile, gp.x, gp.y);
-				if (r&0x8)
+				if (r&0x8){
+					//debug("%x & 0x8", r);
 					goto invalid_rail;
+				}
 
 				if (v->subtype == TS_Front_Engine) v->load_unload_time_rem = 0;
 
@@ -2429,12 +2510,12 @@
 				}
 
 				if (v->subtype == TS_Front_Engine)
-					TrainMovedChangeSignals(gp.new_tile, dir>>1);
+ 				TrainMovedChangeSignals(gp.new_tile, enterdir);
 
 				/* Signals can only change when the first
 				 * (above) or the last vehicle moves. */
 				if (v->next == NULL)
-					TrainMovedChangeSignals(gp.old_tile, (dir>>1) ^ 2);
+ 				TrainMovedChangeSignals(gp.old_tile, (enterdir) ^ 2);
 
 				if (prev == NULL) {
 					AffectSpeedByDirChange(v, chosen_dir);
@@ -2462,9 +2543,9 @@
 common:;
 
 		/* update image of train, as well as delta XY */
-		dir = GetNewVehicleDirection(v, gp.x, gp.y);
-		UpdateTrainDeltaXY(v, dir);
-		v->cur_image = GetTrainImage(v, dir);
+		newdir = GetNewVehicleDirection(v, gp.x, gp.y);
+		UpdateTrainDeltaXY(v, newdir);
+		v->cur_image = GetTrainImage(v, newdir);
 
 		v->x_pos = gp.x;
 		v->y_pos = gp.y;
@@ -2498,18 +2579,18 @@
 		 * FIND_FIRST_BIT only handles 6 bits at a time. */
 		i = FindFirstBit2x64(ts);
 
-		if (!(_map3_lo[gp.new_tile] & _signal_otherdir[i])) {
+		if (!(_map3_lo[gp.new_tile] & _signal_against_trackdir[i])) {
 			v->cur_speed = 0;
 			v->subspeed = 0;
 			v->progress = 255-100;
 			if (++v->load_unload_time_rem < _patches.wait_oneway_signal * 20)
 				return;
-		} else if (_map3_lo[gp.new_tile] & _signal_onedir[i]){
+		} else if (_map3_lo[gp.new_tile] & _signal_along_trackdir[i]){
 			v->cur_speed = 0;
 			v->subspeed = 0;
 			v->progress = 255-10;
 			if (++v->load_unload_time_rem < _patches.wait_twoway_signal * 73) {
-				uint o_tile = gp.new_tile + TileOffsByDir(dir >> 1);
+				uint o_tile = gp.new_tile + TileOffsByDir(enterdir);
 				/* check if a train is waiting on the other side */
 				if (VehicleFromPos(o_tile, (void*)( (o_tile<<8) | (dir^4)), (VehicleFromPosProc*)CheckVehicleAtSignal) == NULL)
 					return;

--- a/variables.h	Mon Jan 31 11:03:23 2005 +0000
+++ b/variables.h	Mon Jan 31 11:23:10 2005 +0000
@@ -128,6 +128,7 @@
 	bool nonuniform_stations;// allow nonuniform train stations
 	bool always_small_airport; // always allow small airports
 	bool realistic_acceleration; // realistic acceleration for trains
+	bool forbid_90_deg; // forbid trains to make 90 deg turns
 	bool invisible_trees; // don't show trees when buildings are transparent
 	bool no_servicing_if_no_breakdowns; // dont send vehicles to depot when breakdowns are disabled
 
@@ -186,6 +187,13 @@
 	byte drag_signals_density; // many signals density
 	bool ainew_active;  // Is the new AI active?
 
+	/* New Path Finding */
+	bool new_pathfinding_all; /* Use the newest pathfinding algorithm for all */
+
+	uint32 npf_rail_firstred_penalty; /* The penalty for when the first signal is red */
+	uint32 npf_rail_station_penalty; /* The penalty for station tiles */
+	uint32 npf_rail_slope_penalty; /* The penalty for sloping upwards */
+
 	bool population_in_label; // Show the population of a town in his label?
 } Patches;
 
@@ -434,6 +442,9 @@
 /* tunnelbridge */
 #define MAX_BRIDGES 13
 
+/* For new pathfinding. Define here so it is globally available */
+#define NPF_TILE_LENGTH 100
+
 /* Autoreplace vehicle stuff*/
 VARDEF byte _autoreplace_array[256];
 VARDEF uint16 _player_num_engines[256];