/**

 * Enumeration for all possible railtypes.

 *

 * This enumeration defines all 4 possible railtypes.

 */

	RAILTYPE_BEGIN    = 0,          ///< Used for iterations

	RAILTYPE_RAIL     = 0,          ///< Standard non-electric rails

	RAILTYPE_ELECTRIC = 1,          ///< Electric rails

	RAILTYPE_MONO     = 2,          ///< Monorail

	RAILTYPE_MAGLEV   = 3,          ///< Maglev

	RAILTYPE_END,                   ///< Used for iterations

	INVALID_RAILTYPE  = 0xFF        ///< Flag for invalid railtype

/**

 * These are used to specify a single track.

 * Can be translated to a trackbit with TrackToTrackbit

 */

	TRACK_BEGIN = 0,        ///< Used for iterations

	TRACK_X     = 0,        ///< Track along the x-axis (north-east to south-west)

	TRACK_Y     = 1,        ///< Track along the y-axis (north-west to south-east)

	TRACK_UPPER = 2,        ///< Track in the upper corner of the tile (north)

	TRACK_LOWER = 3,        ///< Track in the lower corner of the tile (south)

	TRACK_LEFT  = 4,        ///< Track in the left corner of the tile (west)

	TRACK_RIGHT = 5,        ///< Track in the right corner of the tile (east)

	TRACK_END,              ///< Used for iterations

	INVALID_TRACK = 0xFF    ///< Flag for an invalid track

/**

 * Convert an Axis to the corresponding Track

 *

 * @param a the axis to convert

 * @return the track corresponding to the axis

	TRACK_BIT_NONE    = 0U,                                                 ///< No track

	TRACK_BIT_X       = 1U << TRACK_X,                                      ///< X-axis track

	TRACK_BIT_Y       = 1U << TRACK_Y,                                      ///< Y-axis track

	TRACK_BIT_UPPER   = 1U << TRACK_UPPER,                                  ///< Upper track

	TRACK_BIT_LOWER   = 1U << TRACK_LOWER,                                  ///< Lower track

	TRACK_BIT_LEFT    = 1U << TRACK_LEFT,                                   ///< Left track

	TRACK_BIT_RIGHT   = 1U << TRACK_RIGHT,                                  ///< Right track

	TRACK_BIT_CROSS   = TRACK_BIT_X     | TRACK_BIT_Y,                      ///< X-Y-axis cross

	TRACK_BIT_HORZ    = TRACK_BIT_UPPER | TRACK_BIT_LOWER,                  ///< Upper and lower track

	TRACK_BIT_VERT    = TRACK_BIT_LEFT  | TRACK_BIT_RIGHT,                  ///< Left and right track

	TRACK_BIT_3WAY_NE = TRACK_BIT_X     | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,///< "Arrow" to the north-east

	TRACK_BIT_3WAY_SE = TRACK_BIT_Y     | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,///< "Arrow" to the south-east

	TRACK_BIT_3WAY_SW = TRACK_BIT_X     | TRACK_BIT_LOWER | TRACK_BIT_LEFT, ///< "Arrow" to the south-west

	TRACK_BIT_3WAY_NW = TRACK_BIT_Y     | TRACK_BIT_UPPER | TRACK_BIT_LEFT, ///< "Arrow" to the north-west

	TRACK_BIT_ALL     = TRACK_BIT_CROSS | TRACK_BIT_HORZ  | TRACK_BIT_VERT, ///< All possible tracks

	TRACK_BIT_MASK    = 0x3FU,                                              ///< Bitmask for the first 6 bits

	TRACK_BIT_WORMHOLE = 0x40U,                                             ///< Bitflag for a wormhole (used for tunnels)

	TRACK_BIT_DEPOT   = 0x80U,                                              ///< Bitflag for a depot

	INVALID_TRACK_BIT = 0xFF                                                ///< Flag for an invalid trackbits value

 * @param track the track to convert

 * @return the converted TrackBits value of the track

/**

 * Maps an Axis to the corresponding TrackBits value

 * @param a the axis to convert

 * @return the converted TrackBits value of the axis

 */

/**

 * Enumeration for tracks and directions.

 *

 * These are a combination of tracks and directions. Values are 0-5 in one

	TRACKDIR_BEGIN    =  0,         ///< Used for iterations

	TRACKDIR_X_NE     =  0,         ///< X-axis and direction to north-east

	TRACKDIR_Y_SE     =  1,         ///< Y-axis and direction to south-east

	TRACKDIR_UPPER_E  =  2,         ///< Upper track and direction to east

	TRACKDIR_LOWER_E  =  3,         ///< Lower track and direction to east

	TRACKDIR_LEFT_S   =  4,         ///< Left track and direction to south

	TRACKDIR_RIGHT_S  =  5,         ///< Right track and direction to south

	TRACKDIR_RVREV_NE =  6,         ///< (Road vehicle) reverse direction north-east

	TRACKDIR_RVREV_SE =  7,         ///< (Road vehicle) reverse direction south-east

	TRACKDIR_X_SW     =  8,         ///< X-axis and direction to south-west

	TRACKDIR_Y_NW     =  9,         ///< Y-axis and direction to north-west

	TRACKDIR_UPPER_W  = 10,         ///< Upper track and direction to west

	TRACKDIR_LOWER_W  = 11,         ///< Lower track and direction to west

	TRACKDIR_LEFT_N   = 12,         ///< Left track and direction to north

	TRACKDIR_RIGHT_N  = 13,         ///< Right track and direction to north

	TRACKDIR_RVREV_SW = 14,         ///< (Road vehicle) reverse direction south-west

	TRACKDIR_RVREV_NW = 15,         ///< (Road vehicle) reverse direction north-west

	TRACKDIR_END,                   ///< Used for iterations

	INVALID_TRACKDIR  = 0xFF,       ///< Flag for an invalid trackdir

/**

 * Enumeration of bitmasks for the TrackDirs

 *

 * These are a combination of tracks and directions. Values are 0-5 in one

 * direction (corresponding to the Track enum) and 8-13 in the other direction.

 */

	TRACKDIR_BIT_NONE     = 0x0000, ///< No track build

	TRACKDIR_BIT_X_NE     = 0x0001, ///< Track x-axis, direction north-east

	TRACKDIR_BIT_Y_SE     = 0x0002, ///< Track y-axis, direction south-east

	TRACKDIR_BIT_UPPER_E  = 0x0004, ///< Track upper, direction east

	TRACKDIR_BIT_LOWER_E  = 0x0008, ///< Track lower, direction east

	TRACKDIR_BIT_LEFT_S   = 0x0010, ///< Track left, direction south

	TRACKDIR_BIT_RIGHT_S  = 0x0020, ///< Track right, direction south

	TRACKDIR_BIT_X_SW     = 0x0100, ///< Track x-axis, direction south-west

	TRACKDIR_BIT_Y_NW     = 0x0200, ///< Track y-axis, direction north-west

	TRACKDIR_BIT_UPPER_W  = 0x0400, ///< Track upper, direction west

	TRACKDIR_BIT_LOWER_W  = 0x0800, ///< Track lower, direction west

	TRACKDIR_BIT_LEFT_N   = 0x1000, ///< Track left, direction north

	TRACKDIR_BIT_RIGHT_N  = 0x2000, ///< Track right, direction north

	TRACKDIR_BIT_MASK     = 0x3F3F, ///< Bitmask for bit-operations

	INVALID_TRACKDIR_BIT  = 0xFFFF, ///< Flag for an invalid trackdirbit value

		CursorID rail_ns;    ///< Cursor for building rail in N-S direction

		CursorID rail_swne;  ///< Cursor for building rail in X direction

		CursorID rail_ew;    ///< Cursor for building rail in E-W direction

		CursorID rail_nwse;  ///< Cursor for building rail in Y direction

		CursorID autorail;   ///< Cursor for autorail tool

		CursorID depot;      ///< Cursor for building a depot

		CursorID tunnel;     ///< Cursor for building a tunnel

		CursorID convert;    ///< Cursor for converting track

 * @param trackdir the track direction to convert

 * @return the converted TrackdirBits value

static inline TrackdirBits TrackdirToTrackdirBits(Trackdir trackdir)

{

	return (TrackdirBits)(1 << trackdir);

}

 *

 * This function searchs for the first bit in the TrackBits,

 * remove this bit from the parameter and returns the found

 * bit as Track value. It returns INVALID_TRACK if the

 * parameter was TRACK_BIT_NONE or INVALID_TRACK_BIT. This

 * is basically used in while-loops to get up to 6 possible

 * tracks on a tile until the parameter becomes TRACK_BIT_NONE.

 *

 * @param tracks The value with the TrackBits

 * @return The first Track from the TrackBits value

 * @see FindFirstTrack

 *

 * This function searchs for the first bit in the TrackdirBits parameter,

 * remove this bit from the parameter and returns the fnound bit as

 * Trackdir value. It returns INVALID_TRACKDIR if the trackdirs is

 * TRACKDIR_BIT_NONE or INVALID_TRACKDIR_BIT. This is basically used in a

 * while-loop to get all track-directions step by step until the value

 * reaches TRACKDIR_BIT_NONE.

 *

 * @param trackdirs The value with the TrackdirBits

 * @return The first Trackdir from the TrackdirBits value

 * @see FindFirstTrackdir

 *

 * This function returns the first Track found in the TrackBits value as Track-value.

 * It returns INVALID_TRACK if the parameter is TRACK_BIT_NONE or INVALID_TRACK_BIT.

 *

 * @param tracks The TrackBits value

 * @return The first Track found or INVALID_TRACK

 * @see RemoveFirstTrack

 * Converts TrackBits to Track.

 *

 * This function converts a TrackBits value to a Track value. As it

 * is not possible to convert two or more tracks to one track the

 * parameter must contain only one track or be the INVALID_TRACK_BIT value.

 *

 * @param tracks The TrackBits value to convert

 * @return The Track from the value or INVALID_TRACK

 * @pre tracks must contains only one Track or be INVALID_TRACK_BIT

 *

 * This function returns the first Trackdir in the given TrackdirBits value or

 * INVALID_TRACKDIR if the value is TRACKDIR_BIT_NONE. The TrackdirBits must

 * not be INVALID_TRACKDIR_BIT.

 *

 * @param trackdirs The TrackdirBits value

 * @return The first Trackdir from the TrackdirBits or INVALID_TRACKDIR on TRACKDIR_BIT_NONE.

 * @pre trackdirs must not be INVALID_TRACKDIR_BIT

 * @see RemoveFirstTrackdir

 * Checks if a Track is valid.

 *

 * @param track The value to check

 * @return true if the given value is a valid track.

 * @note Use this in an assert()

static inline bool IsValidTrack(Track track)

{

	return track < TRACK_END;

}

 * Checks if a Trackdir is valid.

 *

 * @param trackdir The value to check

 * @return true if the given valie is a valid Trackdir

 * @note Use this in an assert()

 */

static inline bool IsValidTrackdir(Trackdir trackdir)

{

	return (TrackdirToTrackdirBits(trackdir) & TRACKDIR_BIT_MASK) != 0;

}

/*

 *

 * Returns the reverse trackdir of a Trackdir value. The reverse trackdir

 * is the same track with the other direction on it.

 *

 * @param trackdir The Trackdir value

 * @return The reverse trackdir

 * @pre trackdir must not be INVALID_TRACKDIR

 *

 * This function filters the Track which is used in the Trackdir value and

 * returns it as a Track value.

 *

 * @param trackdir The trackdir value

 * @return The Track which is used in the value

static inline Track TrackdirToTrack(Trackdir trackdir)

{

	return (Track)(trackdir & 0x7);

}

 * Returns a Trackdir for the given Track

 *

 * Since every Track corresponds to two Trackdirs, we choose the

 * one which points between NE and S. Note that the actual

 * implementation is quite futile, but this might change

 *

 * @param track The given Track

 * @return The Trackdir from the given Track

static inline Trackdir TrackToTrackdir(Track track)

{

	return (Trackdir)track;

}

 * Returns a TrackdirBit mask from a given Track

 *

 * The TrackdirBit mask contains the two TrackdirBits that

 *

 * @param track The track to get the TrackdirBits from

 * @return The TrackdirBits which the selected tracks

 * Discards all directional information from a TrackdirBits value

 *

 * Any Track which is present in either direction will be present in the result.

 *

 * @param bits The TrackdirBits to get the TrackBits from

 * @return The TrackBits

 * ahead.

 *

 * This will be the same trackdir for diagonal trackdirs, but a

 *

 * @param trackdir The given trackdir

 * @return The next Trackdir value of the next tile.

 *

 * For the diagonal directions these are the complement of the

 * direction, for the straight directions these are the

 * two vertical or horizontal tracks, depend on the given direction

 *

 * @param track The given track

 * @return The TrackBits with the tracks marked which cross the given track by 90 deg.

 *

 * For the diagonal directions these are the same directions. For

 * the straight directions these are the directions from the imagined

 * base-tile to the bordering tile which will be joined if the given

 * straight direction is leaved from the base-tile.

 *

 * @param trackdir The given track direction

 * @return The direction which points to the resulting tile if following the Trackdir

 *

 * For the diagonal tracks the resulting track direction are clear for a given

 * DiagDirection. It either matches the direction or it returns INVALID_TRACKDIR,

 * as a TRACK_X cannot be applied with DIAG_SE.

 * For the straight tracks the resulting track direction will be the

 * direction which the DiagDirection is pointing. But this will be INVALID_TRACKDIR

 * if the DiagDirection is pointing 'away' the track.

 *

 * @param track The track to applie an direction on

 * @param diagdir The DiagDirection to applie on

 * @return The resulting track direction or INVALID_TRACKDIR if not possible.

 * with the entry in the given direction.

 *

 * For the diagonal tracks the return value is clear, its either the matching

 * track direction or INVALID_TRACKDIR.

 * For the straight tracks this returns the track direction which results if

 * you follow the DiagDirection and then turn by 45 deg left or right on the

 * next tile. The new direction on the new track will be the returning Trackdir

 * value. If the parameters makes no sense like the track TRACK_UPPER and the

 * diraction DIAGDIR_NE (target track cannot be reached) this function returns

 * INVALID_TRACKDIR.

 *

 * @param track The target track

 * @param diagdir The direction to "come from"

 * @return the resulting Trackdir or INVALID_TRACKDIR if not possible.

 *

 * @param diagdir The direction

 * @return The resulting Trackdir direction

 * (diagonal) direction.

 *

 * This will obviously include 90 degree turns, since no information is available

 * about the exact angle of entering

 *

 * @param diagdir The joining direction

 * @return The TrackdirBits which can be used from the given direction

 * @see DiagdirReachesTracks

 */

 * (diagonal) direction.

 *

 * This will obviously include 90 degree turns, since no

 * information is available about the exact angle of entering

 *

 * @param diagdir The joining irection

 * @return The tracks which can be used

 * @see DiagdirReachesTrackdirs

 */

 * entering the next tile.

 *

 * This will include 90 degree turns!

 *

 * @param trackdir The track direction which will be leaved

 * @return The track directions which can be used from this direction (in the next tile)

 *

 * For the diagonal tracks this returns the track direction bits

 * of the other axis in both directions, which cannot be joined by

 * the given track direction.

 * For the straight tracks this returns all possible 90 deg turns

 * either on the current tile (which no train can joined) or on the

 * bordering tiles.

 *

 * @param trackdir The track direction

 * @return The TrackdirBits which are (more or less) 90 deg turns.

/**

 * Checks if a given Track is diagonal

 *

 * @param track The given track to check

 * @return true if diagonal, else false

 */

static inline bool IsDiagonalTrack(Track track)

{

	return (track == TRACK_X) || (track == TRACK_Y);

}

/**

 * Checks if a given Trackdir is diagonal.

 *

 * @param trackdir The given trackdir

 * @return true if the trackdir use a diagonal track

 */

static inline bool IsDiagonalTrackdir(Trackdir trackdir)

{

	return IsDiagonalTrack(TrackdirToTrack(trackdir));

}

/**

 * Checks if an engine of the given RailType got power on a tile with a given

 * RailType. This would normally just be an equality check, but for electric

 * rails (which also support non-electric engines).

 * @return Whether the engine got power on this tile.

 * @param  enginetype The RailType of the engine we are considering.

 * @param  tiletype   The RailType of the tile we are considering.

 */