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(svn r10765) -Documentation [FS#1100]: of rail.h. Based on a patch by Progman.

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pull/155/head
rubidium 17 years ago
parent 7cd5c2d860
commit c9c2cd8d2e
1 changed files with 343 additions and 122 deletions
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465
src/rail.h
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@ -9,14 +9,19 @@
#include "direction.h"
#include "tile.h"
/**
* Enumeration for all possible railtypes.
*
* This enumeration defines all 4 possible railtypes.
*/
enum RailType {
RAILTYPE_BEGIN = 0,
RAILTYPE_RAIL = 0,
RAILTYPE_ELECTRIC = 1,
RAILTYPE_MONO = 2,
RAILTYPE_MAGLEV = 3,
RAILTYPE_END,
INVALID_RAILTYPE = 0xFF
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
};
typedef byte RailTypeMask;
@ -28,18 +33,20 @@ template <> struct EnumPropsT<RailType> : MakeEnumPropsT<RailType, byte, RAILTYP
typedef TinyEnumT<RailType> RailTypeByte;
/** These are used to specify a single track.
* Can be translated to a trackbit with TrackToTrackbit */
/**
* These are used to specify a single track.
* Can be translated to a trackbit with TrackToTrackbit
*/
enum Track {
TRACK_BEGIN = 0,
TRACK_X = 0,
TRACK_Y = 1,
TRACK_UPPER = 2,
TRACK_LOWER = 3,
TRACK_LEFT = 4,
TRACK_RIGHT = 5,
TRACK_END,
INVALID_TRACK = 0xFF
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
};
/** Allow incrementing of Track variables */
@ -49,10 +56,14 @@ template <> struct EnumPropsT<Track> : MakeEnumPropsT<Track, byte, TRACK_BEGIN,
typedef TinyEnumT<Track> TrackByte;
/** Convert an Axis to the corresponding Track
/**
* Convert an Axis to the corresponding Track
* AXIS_X -> TRACK_X
* AXIS_Y -> TRACK_Y
* Uses the fact that they share the same internal encoding
*
* @param a the axis to convert
* @return the track corresponding to the axis
*/
static inline Track AxisToTrack(Axis a)
{
@ -62,25 +73,25 @@ static inline Track AxisToTrack(Axis a)
/** Bitfield corresponding to Track */
enum TrackBits {
TRACK_BIT_NONE = 0U,
TRACK_BIT_X = 1U << TRACK_X,
TRACK_BIT_Y = 1U << TRACK_Y,
TRACK_BIT_UPPER = 1U << TRACK_UPPER,
TRACK_BIT_LOWER = 1U << TRACK_LOWER,
TRACK_BIT_LEFT = 1U << TRACK_LEFT,
TRACK_BIT_RIGHT = 1U << TRACK_RIGHT,
TRACK_BIT_CROSS = TRACK_BIT_X | TRACK_BIT_Y,
TRACK_BIT_HORZ = TRACK_BIT_UPPER | TRACK_BIT_LOWER,
TRACK_BIT_VERT = TRACK_BIT_LEFT | TRACK_BIT_RIGHT,
TRACK_BIT_3WAY_NE = TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
TRACK_BIT_3WAY_SE = TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
TRACK_BIT_3WAY_SW = TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
TRACK_BIT_3WAY_NW = TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
TRACK_BIT_ALL = TRACK_BIT_CROSS | TRACK_BIT_HORZ | TRACK_BIT_VERT,
TRACK_BIT_MASK = 0x3FU,
TRACK_BIT_WORMHOLE = 0x40U,
TRACK_BIT_DEPOT = 0x80U,
INVALID_TRACK_BIT = 0xFF
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
};
/** Define basic enum properties */
@ -91,70 +102,83 @@ DECLARE_ENUM_AS_BIT_SET(TrackBits);
/**
* Maps a Track to the corresponding TrackBits value
* @param track the track to convert
* @return the converted TrackBits value of the track
*/
static inline TrackBits TrackToTrackBits(Track track)
{
return (TrackBits)(1 << track);
}
/**
* Maps an Axis to the corresponding TrackBits value
* @param a the axis to convert
* @return the converted TrackBits value of the axis
*/
static inline TrackBits AxisToTrackBits(Axis a)
{
return TrackToTrackBits(AxisToTrack(a));
}
/** These are a combination of tracks and directions. Values are 0-5 in one
/**
* Enumeration for tracks and directions.
*
* 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.
* 6, 7, 14 and 15 are used to encode the reversing of road vehicles. Those
* reversing track dirs are not considered to be 'valid' except in a small
* corner in the road vehicle controller.
*/
enum Trackdir {
TRACKDIR_BEGIN = 0,
TRACKDIR_X_NE = 0,
TRACKDIR_Y_SE = 1,
TRACKDIR_UPPER_E = 2,
TRACKDIR_LOWER_E = 3,
TRACKDIR_LEFT_S = 4,
TRACKDIR_RIGHT_S = 5,
TRACKDIR_RVREV_NE = 6,
TRACKDIR_RVREV_SE = 7,
TRACKDIR_X_SW = 8,
TRACKDIR_Y_NW = 9,
TRACKDIR_UPPER_W = 10,
TRACKDIR_LOWER_W = 11,
TRACKDIR_LEFT_N = 12,
TRACKDIR_RIGHT_N = 13,
TRACKDIR_RVREV_SW = 14,
TRACKDIR_RVREV_NW = 15,
TRACKDIR_END,
INVALID_TRACKDIR = 0xFF,
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
};
/** Define basic enum properties */
template <> struct EnumPropsT<Trackdir> : MakeEnumPropsT<Trackdir, byte, TRACKDIR_BEGIN, TRACKDIR_END, INVALID_TRACKDIR> {};
typedef TinyEnumT<Trackdir> TrackdirByte;
/** 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. */
/**
* 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.
*/
enum TrackdirBits {
TRACKDIR_BIT_NONE = 0x0000,
TRACKDIR_BIT_X_NE = 0x0001,
TRACKDIR_BIT_Y_SE = 0x0002,
TRACKDIR_BIT_UPPER_E = 0x0004,
TRACKDIR_BIT_LOWER_E = 0x0008,
TRACKDIR_BIT_LEFT_S = 0x0010,
TRACKDIR_BIT_RIGHT_S = 0x0020,
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
/* Again, note the two missing values here. This enables trackdir -> track conversion by doing (trackdir & 0xFF) */
TRACKDIR_BIT_X_SW = 0x0100,
TRACKDIR_BIT_Y_NW = 0x0200,
TRACKDIR_BIT_UPPER_W = 0x0400,
TRACKDIR_BIT_LOWER_W = 0x0800,
TRACKDIR_BIT_LEFT_N = 0x1000,
TRACKDIR_BIT_RIGHT_N = 0x2000,
TRACKDIR_BIT_MASK = 0x3F3F,
INVALID_TRACKDIR_BIT = 0xFFFF,
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
};
/** Define basic enum properties */
@ -195,14 +219,14 @@ struct RailtypeInfo {
} gui_sprites;
struct {
CursorID rail_ns;
CursorID rail_swne;
CursorID rail_ew;
CursorID rail_nwse;
CursorID autorail;
CursorID depot;
CursorID tunnel;
CursorID convert;
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
} cursor;
struct {
@ -248,12 +272,28 @@ enum {
/**
* Maps a Trackdir to the corresponding TrackdirBits value
* @param trackdir the track direction to convert
* @return the converted TrackdirBits value
*/
static inline TrackdirBits TrackdirToTrackdirBits(Trackdir trackdir) { return (TrackdirBits)(1 << trackdir); }
static inline TrackdirBits TrackdirToTrackdirBits(Trackdir trackdir)
{
return (TrackdirBits)(1 << trackdir);
}
/**
* Removes first Track from TrackBits and returns it
*/
* Removes first Track from TrackBits and returns it
*
* 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
*/
static inline Track RemoveFirstTrack(TrackBits *tracks)
{
if (*tracks != TRACK_BIT_NONE && *tracks != INVALID_TRACK_BIT) {
@ -265,8 +305,19 @@ static inline Track RemoveFirstTrack(TrackBits *tracks)
}
/**
* Removes first Trackdir from TrackdirBits and returns it
*/
* Removes first Trackdir from TrackdirBits and returns it
*
* 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
*/
static inline Trackdir RemoveFirstTrackdir(TrackdirBits *trackdirs)
{
if (*trackdirs != TRACKDIR_BIT_NONE && *trackdirs != INVALID_TRACKDIR_BIT) {
@ -278,16 +329,31 @@ static inline Trackdir RemoveFirstTrackdir(TrackdirBits *trackdirs)
}
/**
* Returns first Track from TrackBits or INVALID_TRACK
*/
* Returns first Track from TrackBits or INVALID_TRACK
*
* 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
*/
static inline Track FindFirstTrack(TrackBits tracks)
{
return (tracks != TRACK_BIT_NONE && tracks != INVALID_TRACK_BIT) ? (Track)FIND_FIRST_BIT(tracks) : INVALID_TRACK;
}
/**
* Converts TrackBits to Track. TrackBits must contain just one Track or INVALID_TRACK_BIT!
*/
* 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
*/
static inline Track TrackBitsToTrack(TrackBits tracks)
{
assert(tracks == INVALID_TRACK_BIT || (tracks != TRACK_BIT_NONE && KILL_FIRST_BIT(tracks & TRACK_BIT_MASK) == 0));
@ -295,8 +361,17 @@ static inline Track TrackBitsToTrack(TrackBits tracks)
}
/**
* Returns first Trackdir from TrackdirBits or INVALID_TRACKDIR
*/
* Returns first Trackdir from TrackdirBits or INVALID_TRACKDIR
*
* 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
*/
static inline Trackdir FindFirstTrackdir(TrackdirBits trackdirs)
{
assert((trackdirs & ~TRACKDIR_BIT_MASK) == TRACKDIR_BIT_NONE);
@ -304,13 +379,30 @@ static inline Trackdir FindFirstTrackdir(TrackdirBits trackdirs)
}
/**
* These functions check the validity of Tracks and Trackdirs. assert against
* them when convenient.
* 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; }
static inline bool IsValidTrackdir(Trackdir trackdir) { return (TrackdirToTrackdirBits(trackdir) & TRACKDIR_BIT_MASK) != 0; }
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;
}
/*
* Functions to map tracks to the corresponding bits in the signal
* presence/status bytes in the map. You should not use these directly, but
* wrapper functions below instead. XXX: Which are these?
@ -354,6 +446,13 @@ static inline byte SignalOnTrack(Track track)
/**
* Maps a trackdir to the reverse trackdir.
*
* 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
*/
static inline Trackdir ReverseTrackdir(Trackdir trackdir)
{
@ -363,20 +462,42 @@ static inline Trackdir ReverseTrackdir(Trackdir trackdir)
/**
* Returns the Track that a given Trackdir represents
*
* 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); }
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
* 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
* in the future.
*
* @param track The given Track
* @return The Trackdir from the given Track
*/
static inline Trackdir TrackToTrackdir(Track track) { return (Trackdir)track; }
static inline Trackdir TrackToTrackdir(Track track)
{
return (Trackdir)track;
}
/**
* Returns a TrackdirBit mask that contains the two TrackdirBits that
* Returns a TrackdirBit mask from a given Track
*
* The TrackdirBit mask contains the two TrackdirBits that
* correspond with the given Track (one for each direction).
*
* @param track The track to get the TrackdirBits from
* @return The TrackdirBits which the selected tracks
*/
static inline TrackdirBits TrackToTrackdirBits(Track track)
{
@ -385,8 +506,12 @@ static inline TrackdirBits TrackToTrackdirBits(Track track)
}
/**
* Discards all directional information from the given TrackdirBits. Any
* Track which is present in either direction will be present in the result.
* 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
*/
static inline TrackBits TrackdirBitsToTrackBits(TrackdirBits bits)
{
@ -395,8 +520,13 @@ static inline TrackBits TrackdirBitsToTrackBits(TrackdirBits bits)
/**
* Maps a trackdir to the trackdir that you will end up on if you go straight
* ahead. This will be the same trackdir for diagonal trackdirs, but a
* ahead.
*
* This will be the same trackdir for diagonal trackdirs, but a
* different (alternating) one for straight trackdirs
*
* @param trackdir The given trackdir
* @return The next Trackdir value of the next tile.
*/
static inline Trackdir NextTrackdir(Trackdir trackdir)
{
@ -406,6 +536,13 @@ static inline Trackdir NextTrackdir(Trackdir trackdir)
/**
* Maps a track to all tracks that make 90 deg turns with it.
*
* 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.
*/
static inline TrackBits TrackCrossesTracks(Track track)
{
@ -416,6 +553,14 @@ static inline TrackBits TrackCrossesTracks(Track track)
/**
* Maps a trackdir to the (4-way) direction the tile is exited when following
* that trackdir.
*
* 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
*/
static inline DiagDirection TrackdirToExitdir(Trackdir trackdir)
{
@ -426,6 +571,17 @@ static inline DiagDirection TrackdirToExitdir(Trackdir trackdir)
/**
* Maps a track and an (4-way) dir to the trackdir that represents the track
* with the exit in the given direction.
*
* 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.
*/
static inline Trackdir TrackExitdirToTrackdir(Track track, DiagDirection diagdir)
{
@ -435,7 +591,20 @@ static inline Trackdir TrackExitdirToTrackdir(Track track, DiagDirection diagdir
/**
* Maps a track and an (4-way) dir to the trackdir that represents the track
* with the exit in the given direction.
* 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.
*/
static inline Trackdir TrackEnterdirToTrackdir(Track track, DiagDirection diagdir)
{
@ -456,6 +625,9 @@ static inline Trackdir TrackDirectionToTrackdir(Track track, Direction dir)
/**
* Maps a (4-way) direction to the diagonal trackdir that runs in that
* direction.
*
* @param diagdir The direction
* @return The resulting Trackdir direction
*/
static inline Trackdir DiagdirToDiagTrackdir(DiagDirection diagdir)
{
@ -465,8 +637,15 @@ static inline Trackdir DiagdirToDiagTrackdir(DiagDirection diagdir)
/**
* Returns all trackdirs that can be reached when entering a tile from a given
* (diagonal) direction. This will obviously include 90 degree turns, since no
* information is available about the exact angle of entering */
* (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
*/
static inline TrackdirBits DiagdirReachesTrackdirs(DiagDirection diagdir)
{
extern const TrackdirBits _exitdir_reaches_trackdirs[DIAGDIR_END];
@ -475,26 +654,46 @@ static inline TrackdirBits DiagdirReachesTrackdirs(DiagDirection diagdir)
/**
* Returns all tracks that can be reached when entering a tile from a given
* (diagonal) direction. This will obviously include 90 degree turns, since no
* information is available about the exact angle of entering */
* (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
*/
static inline TrackBits DiagdirReachesTracks(DiagDirection diagdir) { return TrackdirBitsToTrackBits(DiagdirReachesTrackdirs(diagdir)); }
/**
* Maps a trackdir to the trackdirs that can be reached from it (ie, when
* entering the next tile. This will include 90 degree turns!
* 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)
*/
static inline TrackdirBits TrackdirReachesTrackdirs(Trackdir trackdir)
{
extern const TrackdirBits _exitdir_reaches_trackdirs[DIAGDIR_END];
return _exitdir_reaches_trackdirs[TrackdirToExitdir(trackdir)];
}
/* Note that there is no direct table for this function (there used to be),
* but it uses two simpeler tables to achieve the result */
/**
* Maps a trackdir to all trackdirs that make 90 deg turns with it.
*
* 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.
*/
static inline TrackdirBits TrackdirCrossesTrackdirs(Trackdir trackdir)
{
@ -502,13 +701,27 @@ static inline TrackdirBits TrackdirCrossesTrackdirs(Trackdir trackdir)
return _track_crosses_trackdirs[TrackdirToTrack(trackdir)];
}
/**
* 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 Track is diagonal */
static inline bool IsDiagonalTrack(Track track) { return (track == TRACK_X) || (track == TRACK_Y); }
/* Checks if a given Trackdir is diagonal. */
static inline bool IsDiagonalTrackdir(Trackdir trackdir) { return IsDiagonalTrack(TrackdirToTrack(trackdir)); }
/**
* 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));
}
/**
* Returns a pointer to the Railtype information for a given railtype
@ -535,6 +748,14 @@ static inline bool IsCompatibleRail(RailType enginetype, RailType tiletype)
return HASBIT(GetRailTypeInfo(enginetype)->compatible_railtypes, tiletype);
}
/**
* 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.
*/
static inline bool HasPowerOnRail(RailType enginetype, RailType tiletype)
{
return HASBIT(GetRailTypeInfo(enginetype)->powered_railtypes, tiletype);

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