signal.cpp File Reference

functions related to rail signals updating More...

#include "stdafx.h"
#include "debug.h"
#include "station_map.h"
#include "tunnelbridge_map.h"
#include "vehicle_func.h"
#include "viewport_func.h"
#include "train.h"
#include "company_base.h"
#include "pbs.h"
#include "safeguards.h"

Go to the source code of this file.

Data Structures
struct	SmallSet< Tdir, items >
	Set containing 'items' items of 'tile and Tdir' No tree structure is used because it would cause slowdowns in most usual cases. More...
struct	SmallSet< Tdir, items >::SSdata
	Element of set. More...

Enumerations
enum	SigFlags {   SF_NONE = 0 , SF_TRAIN = 1 << 0 , SF_EXIT = 1 << 1 , SF_EXIT2 = 1 << 2 ,   SF_GREEN = 1 << 3 , SF_GREEN2 = 1 << 4 , SF_FULL = 1 << 5 , SF_PBS = 1 << 6 ,   SF_SPLIT = 1 << 7 , SF_ENTER = 1 << 8 , SF_ENTER2 = 1 << 9 }
	Current signal block state flags. More...

Functions
static Vehicle *	TrainOnTileEnum (Vehicle *v, void *)
	Check whether there is a train on rail, not in a depot.
static bool	CheckAddToTodoSet (TileIndex t1, DiagDirection d1, TileIndex t2, DiagDirection d2)
	Perform some operations before adding data into Todo set The new and reverse direction is removed from _globset, because we are sure it doesn't need to be checked again Also, remove reverse direction from _tbdset This is the 'core' part so the graph searching won't enter any tile twice. More...
static bool	MaybeAddToTodoSet (TileIndex t1, DiagDirection d1, TileIndex t2, DiagDirection d2)
	Perform some operations before adding data into Todo set The new and reverse direction is removed from Global set, because we are sure it doesn't need to be checked again Also, remove reverse direction from Todo set This is the 'core' part so the graph searching won't enter any tile twice. More...
static SigFlags	ExploreSegment (Owner owner)
	Search signal block. More...
static void	UpdateSignalsAroundSegment (SigFlags flags)
	Update signals around segment in _tbuset. More...
static void	ResetSets ()
	Reset all sets after one set overflowed.
static SigSegState	UpdateSignalsInBuffer (Owner owner)
	Updates blocks in _globset buffer. More...
void	UpdateSignalsInBuffer ()
	Update signals in buffer Called from 'outside'.
void	AddTrackToSignalBuffer (TileIndex tile, Track track, Owner owner)
	Add track to signal update buffer. More...
void	AddSideToSignalBuffer (TileIndex tile, DiagDirection side, Owner owner)
	Add side of tile to signal update buffer. More...
SigSegState	UpdateSignalsOnSegment (TileIndex tile, DiagDirection side, Owner owner)
	Update signals, starting at one side of a tile Will check tile next to this at opposite side too. More...
void	SetSignalsOnBothDir (TileIndex tile, Track track, Owner owner)
	Update signals at segments that are at both ends of given (existent or non-existent) track. More...

Variables
static const uint	SIG_TBU_SIZE = 64
	these are the maximums used for updating signal blocks More...
static const uint	SIG_TBD_SIZE = 256
	number of intersections - open nodes in current block
static const uint	SIG_GLOB_SIZE = 128
	number of open blocks (block can be opened more times until detected)
static const uint	SIG_GLOB_UPDATE = 64
	how many items need to be in _globset to force update
static const TrackBits	_enterdir_to_trackbits [DIAGDIR_END]
	incidating trackbits with given enterdir More...
static const TrackdirBits	_enterdir_to_trackdirbits [DIAGDIR_END]
	incidating trackdirbits with given enterdir More...
static SmallSet< Trackdir, SIG_TBU_SIZE >	_tbuset ("_tbuset")
	set of signals that will be updated
static SmallSet< DiagDirection, SIG_TBD_SIZE >	_tbdset ("_tbdset")
	set of open nodes in current signal block
static SmallSet< DiagDirection, SIG_GLOB_SIZE >	_globset ("_globset")
	set of places to be updated in following runs
static Owner	_last_owner = INVALID_OWNER
	last owner whose track was put into _globset

Detailed Description

functions related to rail signals updating

Definition in file signal.cpp.

Enumeration Type Documentation

SigFlags

enum SigFlags

Current signal block state flags.

Enumerator
SF_TRAIN	train found in segment
SF_EXIT	exitsignal found
SF_EXIT2	two or more exits found
SF_GREEN	green exitsignal found
SF_GREEN2	two or more green exits found
SF_FULL	some of buffers was full, do not continue
SF_PBS	pbs signal found
SF_SPLIT	track merge/split found
SF_ENTER	signal entering the block found
SF_ENTER2	two or more signals entering the block found

Definition at line 246 of file signal.cpp.

Function Documentation

AddSideToSignalBuffer()

void AddSideToSignalBuffer	(	TileIndex	tile,
		DiagDirection	side,
		Owner	owner
	)

Add side of tile to signal update buffer.

Parameters

tile	tile where we start
side	side of tile
owner	owner whose signals we will update

Definition at line 624 of file signal.cpp.

References _globset, _last_owner, INVALID_OWNER, SIG_GLOB_UPDATE, and UpdateSignalsInBuffer().

AddTrackToSignalBuffer()

void AddTrackToSignalBuffer	(	TileIndex	tile,
		Track	track,
		Owner	owner
	)

Add track to signal update buffer.

Parameters

tile	tile where we start
track	track at which ends we will update signals
owner	owner whose signals we will update

Definition at line 592 of file signal.cpp.

References _globset, _last_owner, DIAGDIR_NE, DIAGDIR_NW, DIAGDIR_SE, DIAGDIR_SW, INVALID_OWNER, SIG_GLOB_UPDATE, and UpdateSignalsInBuffer().

Referenced by SetSignalsOnBothDir().

CheckAddToTodoSet()

static bool CheckAddToTodoSet ( TileIndex  t1, DiagDirection  d1, TileIndex  t2, DiagDirection  d2  )

inlinestatic

Perform some operations before adding data into Todo set The new and reverse direction is removed from _globset, because we are sure it doesn't need to be checked again Also, remove reverse direction from _tbdset This is the 'core' part so the graph searching won't enter any tile twice.

Parameters

t1	tile we are entering
d1	direction (tile side) we are entering
t2	tile we are leaving
d2	direction (tile side) we are leaving

Returns

false iff reverse direction was in Todo set

Definition at line 213 of file signal.cpp.

References _globset, and _tbdset.

Referenced by MaybeAddToTodoSet().

ExploreSegment()

static SigFlags ExploreSegment ( Owner  owner )

static

Search signal block.

Parameters

owner

owner whose signals we are updating

Returns

SigFlags

Definition at line 269 of file signal.cpp.

Referenced by UpdateSignalsInBuffer().

MaybeAddToTodoSet()

static bool MaybeAddToTodoSet ( TileIndex  t1, DiagDirection  d1, TileIndex  t2, DiagDirection  d2  )

inlinestatic

Perform some operations before adding data into Todo set The new and reverse direction is removed from Global set, because we are sure it doesn't need to be checked again Also, remove reverse direction from Todo set This is the 'core' part so the graph searching won't enter any tile twice.

Parameters

t1	tile we are entering
d1	direction (tile side) we are entering
t2	tile we are leaving
d2	direction (tile side) we are leaving

Returns

false iff the Todo buffer would be overrun

Definition at line 237 of file signal.cpp.

References _tbdset, and CheckAddToTodoSet().

SetSignalsOnBothDir()

void SetSignalsOnBothDir	(	TileIndex	tile,
		Track	track,
		Owner	owner
	)

Update signals at segments that are at both ends of given (existent or non-existent) track.

See also

UpdateSignalsInBuffer()

Parameters

tile	tile where we start
track	track at which ends we will update signals
owner	owner whose signals we will update

Definition at line 668 of file signal.cpp.

References _globset, AddTrackToSignalBuffer(), and UpdateSignalsInBuffer().

UpdateSignalsAroundSegment()

static void UpdateSignalsAroundSegment ( SigFlags  flags )

static

Update signals around segment in _tbuset.

Parameters

flags

info about segment

Definition at line 413 of file signal.cpp.

References _tbuset, HasSignalOnTrackdir(), INVALID_TILE, INVALID_TRACKDIR, and TrackdirToTrack().

Referenced by UpdateSignalsInBuffer().

UpdateSignalsInBuffer()

static SigSegState UpdateSignalsInBuffer ( Owner  owner )

static

Updates blocks in _globset buffer.

Parameters

owner

company whose signals we are updating

Returns

state of the first block from _globset

Precondition

Company::IsValidID(owner)

Definition at line 482 of file signal.cpp.

References _enterdir_to_trackbits, _globset, _tbdset, _tbuset, ExploreSegment(), GetOtherTunnelBridgeEnd(), GetRailDepotDirection(), GetTileTrackStatus(), GetTileType(), GetTunnelBridgeDirection(), GetTunnelBridgeTransportType(), INVALID_DIAGDIR, INVALID_TILE, IsRailDepot(), Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem<&_company_pool >::IsValidID(), MP_RAILWAY, MP_ROAD, MP_STATION, MP_TUNNELBRIDGE, ResetSets(), ReverseDiagDir(), SF_EXIT, SF_FULL, SF_GREEN, SF_PBS, SF_TRAIN, SIGSEG_FREE, SIGSEG_FULL, SIGSEG_PBS, TileOffsByDiagDir(), TRACK_BIT_NONE, TrackStatusToTrackBits(), TRANSPORT_RAIL, and UpdateSignalsAroundSegment().

Referenced by AddSideToSignalBuffer(), AddTrackToSignalBuffer(), DoFloodTile(), CommandHelperBase::InternalExecuteProcessResult(), SetSignalsOnBothDir(), UpdateSignalsInBuffer(), and UpdateSignalsOnSegment().

UpdateSignalsOnSegment()

SigSegState UpdateSignalsOnSegment	(	TileIndex	tile,
		DiagDirection	side,
		Owner	owner
	)

Update signals, starting at one side of a tile Will check tile next to this at opposite side too.

See also

UpdateSignalsInBuffer()

Parameters

tile	tile where we start
side	side of tile
owner	owner whose signals we will update

Returns

the state of the signal segment

Definition at line 650 of file signal.cpp.

References _globset, and UpdateSignalsInBuffer().

Referenced by CheckTrainStayInDepot(), and VehicleEnterDepot().

Variable Documentation

_enterdir_to_trackbits

const TrackBits _enterdir_to_trackbits[DIAGDIR_END]

static

Initial value:

= {
  TRACK_BIT_3WAY_NE,
  TRACK_BIT_3WAY_SE,
  TRACK_BIT_3WAY_SW,
  TRACK_BIT_3WAY_NW
}

incidating trackbits with given enterdir

Definition at line 32 of file signal.cpp.

Referenced by UpdateSignalsInBuffer().

_enterdir_to_trackdirbits

const TrackdirBits _enterdir_to_trackdirbits[DIAGDIR_END]

static

Initial value:

= {
  TRACKDIR_BIT_X_SW | TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_RIGHT_S,
  TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_RIGHT_N,
  TRACKDIR_BIT_X_NE | TRACKDIR_BIT_LOWER_E | TRACKDIR_BIT_LEFT_N,
  TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E | TRACKDIR_BIT_LEFT_S
}

incidating trackdirbits with given enterdir

Definition at line 40 of file signal.cpp.

SIG_TBU_SIZE

const uint SIG_TBU_SIZE = 64

static

these are the maximums used for updating signal blocks

number of signals entering to block

Definition at line 24 of file signal.cpp.