rubidium@9724: /* $Id$ */
rubidium@9724: 
rubidium@9724: /** @file signal.cpp functions related to rail signals updating */
rubidium@9724: 
rubidium@9724: #include "stdafx.h"
rubidium@9724: #include "openttd.h"
rubidium@9724: #include "debug.h"
rubidium@9724: #include "tile_cmd.h"
rubidium@9724: #include "rail_map.h"
rubidium@9724: #include "road_map.h"
rubidium@9724: #include "station_map.h"
rubidium@9724: #include "tunnelbridge_map.h"
rubidium@9724: #include "vehicle_func.h"
rubidium@9724: #include "train.h"
rubidium@9724: #include "newgrf_station.h"
rubidium@9724: #include "functions.h"
rubidium@9724: #include "track_type.h"
rubidium@9724: #include "track_func.h"
rubidium@9724: #include "signal_func.h"
rubidium@9724: #include "player_func.h"
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /** these are the maximums used for updating signal blocks */
rubidium@9724: enum {
rubidium@9724: 	SIG_TBU_SIZE    =  64, ///< number of signals entering to block
rubidium@9724: 	SIG_TBD_SIZE    = 256, ///< number of intersections - open nodes in current block
rubidium@9724: 	SIG_GLOB_SIZE   = 128, ///< number of open blocks (block can be opened more times until detected)
rubidium@9724: 	SIG_GLOB_UPDATE =  64, ///< how many items need to be in _globset to force update
rubidium@9724: };
rubidium@9724: 
rubidium@9724: /* need to typecast to compile with MorphOS */
rubidium@9724: assert_compile((int)SIG_GLOB_UPDATE <= (int)SIG_GLOB_SIZE);
rubidium@9724: 
rubidium@9724: /** incidating trackbits with given enterdir */
rubidium@9724: static const TrackBitsByte _enterdir_to_trackbits[DIAGDIR_END] = {
rubidium@9724: 	{TRACK_BIT_3WAY_NE},
rubidium@9724: 	{TRACK_BIT_3WAY_SE},
rubidium@9724: 	{TRACK_BIT_3WAY_SW},
rubidium@9724: 	{TRACK_BIT_3WAY_NW}
rubidium@9724: };
rubidium@9724: 
rubidium@9724: /** incidating trackdirbits with given enterdir */
rubidium@9724: static const TrackdirBitsShort _enterdir_to_trackdirbits[DIAGDIR_END] = {
rubidium@9724: 	{TRACKDIR_BIT_X_SW | TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_RIGHT_S},
rubidium@9724: 	{TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_RIGHT_N},
rubidium@9724: 	{TRACKDIR_BIT_X_NE | TRACKDIR_BIT_LOWER_E | TRACKDIR_BIT_LEFT_N},
rubidium@9724: 	{TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E | TRACKDIR_BIT_LEFT_S}
rubidium@9724: };
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Set containing 'items' items of 'tile and Tdir'
rubidium@9724:  * No tree structure is used because it would cause
rubidium@9724:  * slowdowns in most usual cases
rubidium@9724:  */
rubidium@9724: template <typename Tdir, uint items>
rubidium@9724: struct SmallSet {
rubidium@9724: private:
rubidium@9724: 	uint n;           // actual number of units
rubidium@9724: 	bool overflowed;  // did we try to oveflow the set?
rubidium@9724: 	const char *name; // name, used for debugging purposes...
rubidium@9724: 
rubidium@9724: 	/** Element of set */
rubidium@9724: 	struct SSdata {
rubidium@9724: 		TileIndex tile;
rubidium@9724: 		Tdir dir;
rubidium@9724: 	} data[items];
rubidium@9724: 
rubidium@9724: public:
rubidium@9724: 	/** Constructor - just set default values and 'name' */
rubidium@9724: 	SmallSet(const char *name) : n(0), overflowed(false), name(name) { }
rubidium@9724: 
rubidium@9724: 	/** Reset variables to default values */
rubidium@9724: 	void Reset()
rubidium@9724: 	{
rubidium@9724: 		this->n = 0;
rubidium@9724: 		this->overflowed = false;
rubidium@9724: 	}
rubidium@9724: 
rubidium@9724: 	/**
rubidium@9724: 	 * Returns value of 'oveflowed'
rubidium@9724: 	 * @return did we try to overflow the set?
rubidium@9724: 	 */
rubidium@9724: 	bool Overflowed()
rubidium@9724: 	{
rubidium@9724: 		return this->overflowed;
rubidium@9724: 	}
rubidium@9724: 
rubidium@9724: 	/**
rubidium@9724: 	 * Checks for empty set
rubidium@9724: 	 * @return is the set empty?
rubidium@9724: 	 */
rubidium@9724: 	bool IsEmpty()
rubidium@9724: 	{
rubidium@9724: 		return this->n == 0;
rubidium@9724: 	}
rubidium@9724: 
rubidium@9724: 	/**
rubidium@9724: 	 * Checks for full set
rubidium@9724: 	 * @return is the set full?
rubidium@9724: 	 */
rubidium@9724: 	bool IsFull()
rubidium@9724: 	{
rubidium@9724: 		return this->n == lengthof(data);
rubidium@9724: 	}
rubidium@9724: 
rubidium@9724: 	/**
rubidium@9724: 	 * Reads the number of items
rubidium@9724: 	 * @return current number of items
rubidium@9724: 	 */
rubidium@9724: 	uint Items()
rubidium@9724: 	{
rubidium@9724: 		return this->n;
rubidium@9724: 	}
rubidium@9724: 
rubidium@9724: 
rubidium@9724: 	/**
rubidium@9724: 	 * Tries to remove first instance of given tile and dir
rubidium@9724: 	 * @param tile tile
rubidium@9724: 	 * @param dir and dir to remove
rubidium@9724: 	 * @return element was found and removed
rubidium@9724: 	 */
rubidium@9724: 	bool Remove(TileIndex tile, Tdir dir)
rubidium@9724: 	{
rubidium@9724: 		for (uint i = 0; i < this->n; i++) {
rubidium@9724: 			if (this->data[i].tile == tile && this->data[i].dir == dir) {
rubidium@9724: 				this->data[i] = this->data[--this->n];
rubidium@9724: 				return true;
rubidium@9724: 			}
rubidium@9724: 		}
rubidium@9724: 
rubidium@9724: 		return false;
rubidium@9724: 	}
rubidium@9724: 
rubidium@9724: 	/**
rubidium@9724: 	 * Tries to find given tile and dir in the set
rubidium@9724: 	 * @param tile tile
rubidium@9724: 	 * @param dir and dir to find
rubidium@9724: 	 * @return true iff the tile & dir elemnt was found
rubidium@9724: 	 */
rubidium@9724: 	bool IsIn(TileIndex tile, Tdir dir)
rubidium@9724: 	{
rubidium@9724: 		for (uint i = 0; i < this->n; i++) {
rubidium@9724: 			if (this->data[i].tile == tile && this->data[i].dir == dir) return true;
rubidium@9724: 		}
rubidium@9724: 
rubidium@9724: 		return false;
rubidium@9724: 	}
rubidium@9724: 
rubidium@9724: 	/**
rubidium@9724: 	 * Adds tile & dir into the set, checks for full set
rubidium@9724: 	 * Sets the 'overflowed' flag if the set was full
rubidium@9724: 	 * @param tile tile
rubidium@9724: 	 * @param dir and dir to add
rubidium@9724: 	 * @return true iff the item could be added (set wasn't full)
rubidium@9724: 	 */
rubidium@9724: 	bool Add(TileIndex tile, Tdir dir)
rubidium@9724: 	{
rubidium@9724: 		if (this->IsFull()) {
rubidium@9724: 			overflowed = true;
rubidium@9724: 			DEBUG(misc, 0, "SignalSegment too complex. Set %s is full (maximum %d)", name, items);
rubidium@9724: 			return false; // set is full
rubidium@9724: 		}
rubidium@9724: 
rubidium@9724: 		this->data[this->n].tile = tile;
rubidium@9724: 		this->data[this->n].dir = dir;
rubidium@9724: 		this->n++;
rubidium@9724: 
rubidium@9724: 		return true;
rubidium@9724: 	}
rubidium@9724: 
rubidium@9724: 	/**
rubidium@9724: 	 * Reads the last added element into the set
rubidium@9724: 	 * @param tile pointer where tile is written to
rubidium@9724: 	 * @param dir pointer where dir is written to
rubidium@9724: 	 * @return false iff the set was empty
rubidium@9724: 	 */
rubidium@9724: 	bool Get(TileIndex *tile, Tdir *dir)
rubidium@9724: 	{
rubidium@9724: 		if (this->n == 0) return false;
rubidium@9724: 
rubidium@9724: 		this->n--;
rubidium@9724: 		*tile = this->data[this->n].tile;
rubidium@9724: 		*dir = this->data[this->n].dir;
rubidium@9724: 
rubidium@9724: 		return true;
rubidium@9724: 	}
rubidium@9724: };
rubidium@9724: 
rubidium@9724: static SmallSet<Trackdir, SIG_TBU_SIZE> _tbuset("_tbuset");         ///< set of signals that will be updated
rubidium@9724: static SmallSet<DiagDirection, SIG_TBD_SIZE> _tbdset("_tbdset");    ///< set of open nodes in current signal block
rubidium@9724: static SmallSet<DiagDirection, SIG_GLOB_SIZE> _globset("_globset"); ///< set of places to be updated in following runs
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /** Check whether there is a train on rail, not in a depot */
rubidium@9724: static void *TrainOnTileEnum(Vehicle *v, void *)
rubidium@9724: {
rubidium@9724: 	if (v->type != VEH_TRAIN || v->u.rail.track == TRACK_BIT_DEPOT) return NULL;
rubidium@9724: 
rubidium@9724: 	return v;
rubidium@9724: }
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Perform some operations before adding data into Todo set
rubidium@9724:  * The new and reverse direction is removed from _globset, because we are sure
rubidium@9724:  * it doesn't need to be checked again
rubidium@9724:  * Also, remove reverse direction from _tbdset
rubidium@9724:  * This is the 'core' part so the graph seaching won't enter any tile twice
rubidium@9724:  *
rubidium@9724:  * @param t1 tile we are entering
rubidium@9724:  * @param d1 direction (tile side) we are entering
rubidium@9724:  * @param t2 tile we are leaving
rubidium@9724:  * @param d2 direction (tile side) we are leaving
rubidium@9724:  * @return false iff reverse direction was in Todo set
rubidium@9724:  */
rubidium@9724: static inline bool CheckAddToTodoSet(TileIndex t1, DiagDirection d1, TileIndex t2, DiagDirection d2)
rubidium@9724: {
rubidium@9724: 	_globset.Remove(t1, d1); // it can be in Global but not in Todo
rubidium@9724: 	_globset.Remove(t2, d2); // remove in all cases
rubidium@9724: 
rubidium@9724: 	assert(!_tbdset.IsIn(t1, d1)); // it really shouldn't be there already
rubidium@9724: 
rubidium@9724: 	if (_tbdset.Remove(t2, d2)) return false;
rubidium@9724: 
rubidium@9724: 	return true;
rubidium@9724: }
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Perform some operations before adding data into Todo set
rubidium@9724:  * The new and reverse direction is removed from Global set, because we are sure
rubidium@9724:  * it doesn't need to be checked again
rubidium@9724:  * Also, remove reverse direction from Todo set
rubidium@9724:  * This is the 'core' part so the graph seaching won't enter any tile twice
rubidium@9724:  *
rubidium@9724:  * @param t1 tile we are entering
rubidium@9724:  * @param d1 direction (tile side) we are entering
rubidium@9724:  * @param t2 tile we are leaving
rubidium@9724:  * @param d2 direction (tile side) we are leaving
rubidium@9724:  * @return false iff the Todo buffer would be overrun
rubidium@9724:  */
rubidium@9724: static inline bool MaybeAddToTodoSet(TileIndex t1, DiagDirection d1, TileIndex t2, DiagDirection d2)
rubidium@9724: {
rubidium@9724: 	if (!CheckAddToTodoSet(t1, d1, t2, d2)) return true;
rubidium@9724: 
rubidium@9724: 	return _tbdset.Add(t1, d1);
rubidium@9724: }
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /** Current signal block state flags */
rubidium@9724: enum SigFlags {
rubidium@9724: 	SF_NONE   = 0,
rubidium@9724: 	SF_TRAIN  = 1 << 0, ///< train found in segment
rubidium@9724: 	SF_EXIT   = 1 << 1, ///< exitsignal found
rubidium@9724: 	SF_EXIT2  = 1 << 2, ///< two or more exits found
rubidium@9724: 	SF_GREEN  = 1 << 3, ///< green exitsignal found
rubidium@9724: 	SF_GREEN2 = 1 << 4, ///< two or more green exits found
rubidium@9724: 	SF_FULL   = 1 << 5, ///< some of buffers was full, do not continue
rubidium@9724: };
rubidium@9724: 
rubidium@9724: DECLARE_ENUM_AS_BIT_SET(SigFlags)
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Search signal block
rubidium@9724:  *
rubidium@9724:  * @param owner owner whose signals we are updating
rubidium@9724:  * @return SigFlags
rubidium@9724:  */
rubidium@9724: static SigFlags ExploreSegment(Owner owner)
rubidium@9724: {
rubidium@9724: 	SigFlags flags = SF_NONE;
rubidium@9724: 
rubidium@9724: 	TileIndex tile;
rubidium@9724: 	DiagDirection enterdir;
rubidium@9724: 
rubidium@9724: 	while (_tbdset.Get(&tile, &enterdir)) {
rubidium@9724: 		TileIndex oldtile = tile; // tile we are leaving
rubidium@9724: 		DiagDirection exitdir = enterdir == INVALID_DIAGDIR ? INVALID_DIAGDIR : ReverseDiagDir(enterdir); // expected new exit direction (for straight line)
rubidium@9724: 
rubidium@9724: 		switch (GetTileType(tile)) {
rubidium@9724: 			case MP_RAILWAY: {
rubidium@9724: 				if (GetTileOwner(tile) != owner) continue; // do not propagate signals on others' tiles (remove for tracksharing)
rubidium@9724: 
rubidium@9724: 				if (IsRailDepot(tile)) {
rubidium@9724: 					if (enterdir == INVALID_DIAGDIR) { // from 'inside' - train just entered or left the depot
rubidium@9724: 						if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
rubidium@9724: 						exitdir = GetRailDepotDirection(tile);
rubidium@9724: 						tile += TileOffsByDiagDir(exitdir);
rubidium@9724: 						enterdir = ReverseDiagDir(exitdir);
rubidium@9724: 						break;
rubidium@9724: 					} else if (enterdir == GetRailDepotDirection(tile)) { // entered a depot
rubidium@9724: 						if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
rubidium@9724: 						continue;
rubidium@9724: 					} else {
rubidium@9724: 						continue;
rubidium@9724: 					}
rubidium@9724: 				}
rubidium@9724: 
rubidium@9724: 				if (GetRailTileType(tile) == RAIL_TILE_WAYPOINT) {
rubidium@9724: 					if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
rubidium@9724: 					tile += TileOffsByDiagDir(exitdir);
rubidium@9724: 					/* enterdir and exitdir stay the same */
rubidium@9724: 					break;
rubidium@9724: 				}
rubidium@9724: 
rubidium@9724: 				TrackBits tracks = GetTrackBits(tile); // trackbits of tile
rubidium@9724: 				TrackBits tracks_masked = (TrackBits)(tracks & _enterdir_to_trackbits[enterdir]); // only incidating trackbits
rubidium@9724: 
rubidium@9724: 				if (tracks == TRACK_BIT_HORZ || tracks == TRACK_BIT_VERT) { // there is exactly one incidating track, no need to check
rubidium@9724: 					tracks = tracks_masked;
rubidium@9724: 					if (!(flags & SF_TRAIN) && VehicleFromPos(tile, &tracks, &EnsureNoTrainOnTrackProc)) flags |= SF_TRAIN;
rubidium@9724: 				} else {
rubidium@9724: 					if (tracks_masked == TRACK_BIT_NONE) continue; // no incidating track
rubidium@9724: 					if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
rubidium@9724: 				}
rubidium@9724: 
rubidium@9724: 				if (HasSignals(tile)) { // there is exactly one track - not zero, because there is exit from this tile
rubidium@9724: 					Track track = TrackBitsToTrack(tracks_masked); // mask TRACK_BIT_X and Y too
rubidium@9724: 					if (HasSignalOnTrack(tile, track)) { // now check whole track, not trackdir
rubidium@9724: 						SignalType sig = GetSignalType(tile, track);
rubidium@9724: 						Trackdir trackdir = (Trackdir)FindFirstBit((tracks * 0x101) & _enterdir_to_trackdirbits[enterdir]);
rubidium@9724: 						Trackdir reversedir = ReverseTrackdir(trackdir);
rubidium@9724: 						/* add (tile, reversetrackdir) to 'to-be-updated' set when there is
rubidium@9724: 						 * ANY signal in REVERSE direction
rubidium@9724: 						 * (if it is a presignal EXIT and it changes, it will be added to 'to-be-done' set later) */
rubidium@9724: 						if (HasSignalOnTrackdir(tile, reversedir)) {
rubidium@9724: 							if (!_tbuset.Add(tile, reversedir)) return flags | SF_FULL;
rubidium@9724: 						}
rubidium@9724: 						/* if it is a presignal EXIT in OUR direction and we haven't found 2 green exits yes, do special check */
rubidium@9724: 						if (!(flags & SF_GREEN2) && (sig & SIGTYPE_EXIT) && HasSignalOnTrackdir(tile, trackdir)) { // found presignal exit
rubidium@9724: 							if (flags & SF_EXIT) flags |= SF_EXIT2; // found two (or more) exits
rubidium@9724: 							flags |= SF_EXIT; // found at least one exit - allow for compiler optimizations
rubidium@9724: 							if (GetSignalStateByTrackdir(tile, trackdir) == SIGNAL_STATE_GREEN) { // found green presignal exit
rubidium@9724: 								if (flags & SF_GREEN) flags |= SF_GREEN2;
rubidium@9724: 								flags |= SF_GREEN;
rubidium@9724: 							}
rubidium@9724: 						}
rubidium@9724: 						continue;
rubidium@9724: 					}
rubidium@9724: 				}
rubidium@9724: 
rubidium@9724: 				for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) { // test all possible exit directions
rubidium@9724: 					if (dir != enterdir && tracks & _enterdir_to_trackbits[dir]) { // any track incidating?
rubidium@9724: 						TileIndex newtile = tile + TileOffsByDiagDir(dir);  // new tile to check
rubidium@9724: 						DiagDirection newdir = ReverseDiagDir(dir); // direction we are entering from
rubidium@9724: 						if (!MaybeAddToTodoSet(newtile, newdir, tile, dir)) return flags | SF_FULL;
rubidium@9724: 					}
rubidium@9724: 				}
rubidium@9724: 
rubidium@9724: 				continue; // continue the while() loop
rubidium@9724: 				}
rubidium@9724: 
rubidium@9724: 			case MP_STATION:
rubidium@9724: 				if (!IsRailwayStation(tile)) continue;
rubidium@9724: 				if (GetTileOwner(tile) != owner) continue;
rubidium@9724: 				if (DiagDirToAxis(enterdir) != GetRailStationAxis(tile)) continue; // different axis
rubidium@9724: 				if (IsStationTileBlocked(tile)) continue; // 'eye-candy' station tile
rubidium@9724: 
rubidium@9724: 				if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
rubidium@9724: 				tile += TileOffsByDiagDir(exitdir);
rubidium@9724: 				break;
rubidium@9724: 
rubidium@9724: 			case MP_ROAD:
rubidium@9724: 				if (!IsLevelCrossing(tile)) continue;
rubidium@9724: 				if (GetTileOwner(tile) != owner) continue;
rubidium@9724: 				if (DiagDirToAxis(enterdir) == GetCrossingRoadAxis(tile)) continue; // different axis
rubidium@9724: 
rubidium@9724: 				if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
rubidium@9724: 				tile += TileOffsByDiagDir(exitdir);
rubidium@9724: 				break;
rubidium@9724: 
rubidium@9724: 			case MP_TUNNELBRIDGE: {
rubidium@9724: 				if (GetTileOwner(tile) != owner) continue;
rubidium@9724: 				if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
rubidium@9724: 				DiagDirection dir = GetTunnelBridgeDirection(tile);
rubidium@9724: 
rubidium@9724: 				if (enterdir == INVALID_DIAGDIR) { // incoming from the wormhole
rubidium@9724: 					if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
rubidium@9724: 					enterdir = dir;
rubidium@9724: 					exitdir = ReverseDiagDir(dir);
rubidium@9724: 					tile += TileOffsByDiagDir(exitdir); // just skip to next tile
rubidium@9724: 				} else { // NOT incoming from the wormhole!
rubidium@9724: 					if (ReverseDiagDir(enterdir) != dir) continue;
rubidium@9724: 					if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
rubidium@9724: 					tile = GetOtherTunnelBridgeEnd(tile); // just skip to exit tile
rubidium@9724: 					enterdir = INVALID_DIAGDIR;
rubidium@9724: 					exitdir = INVALID_DIAGDIR;
rubidium@9724: 				}
rubidium@9724: 				}
rubidium@9724: 				break;
rubidium@9724: 
rubidium@9724: 			default:
rubidium@9724: 				continue; // continue the while() loop
rubidium@9724: 		}
rubidium@9724: 
rubidium@9724: 		if (!MaybeAddToTodoSet(tile, enterdir, oldtile, exitdir)) return flags | SF_FULL;
rubidium@9724: 	}
rubidium@9724: 
rubidium@9724: 	return flags;
rubidium@9724: }
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Update signals around segment in _tbuset
rubidium@9724:  *
rubidium@9724:  * @param flags info about segment
rubidium@9724:  */
rubidium@9724: static void UpdateSignalsAroundSegment(SigFlags flags)
rubidium@9724: {
rubidium@9724: 	TileIndex tile;
rubidium@9724: 	Trackdir trackdir;
rubidium@9724: 
rubidium@9724: 	while (_tbuset.Get(&tile, &trackdir)) {
rubidium@9724: 		assert(HasSignalOnTrackdir(tile, trackdir));
rubidium@9724: 
rubidium@9724: 		SignalType sig = GetSignalType(tile, TrackdirToTrack(trackdir));
rubidium@9724: 		SignalState newstate = SIGNAL_STATE_GREEN;
rubidium@9724: 
rubidium@9724: 		/* determine whether the new state is red */
rubidium@9724: 		if (flags & SF_TRAIN) {
rubidium@9724: 			/* train in the segment */
rubidium@9724: 			newstate = SIGNAL_STATE_RED;
rubidium@9724: 		} else {
rubidium@10249: 			/* is it a bidir combo? - then do not count its other signal direction as exit */
rubidium@9724: 			if (sig == SIGTYPE_COMBO && HasSignalOnTrackdir(tile, ReverseTrackdir(trackdir))) {
rubidium@9724: 				/* at least one more exit */
rubidium@9724: 				if (flags & SF_EXIT2 &&
rubidium@10249: 						/* no green exit */
rubidium@9724: 						(!(flags & SF_GREEN) ||
rubidium@9724: 						/* only one green exit, and it is this one - so all other exits are red */
rubidium@9724: 						(!(flags & SF_GREEN2) && GetSignalStateByTrackdir(tile, ReverseTrackdir(trackdir)) == SIGNAL_STATE_GREEN))) {
rubidium@9724: 					newstate = SIGNAL_STATE_RED;
rubidium@9724: 				}
rubidium@9724: 			} else { // entry, at least one exit, no green exit
rubidium@9724: 				if (sig & SIGTYPE_ENTRY && (flags & SF_EXIT && !(flags & SF_GREEN))) newstate = SIGNAL_STATE_RED;
rubidium@9724: 			}
rubidium@9724: 		}
rubidium@9724: 
rubidium@9724: 		/* only when the state changes */
rubidium@9724: 		if (newstate != GetSignalStateByTrackdir(tile, trackdir)) {
rubidium@9724: 			if (sig & SIGTYPE_EXIT) {
rubidium@9724: 				/* for pre-signal exits, add block to the global set */
rubidium@9724: 				DiagDirection exitdir = TrackdirToExitdir(ReverseTrackdir(trackdir));
rubidium@9724: 				_globset.Add(tile, exitdir); // do not check for full global set, first update all signals
rubidium@9724: 			}
rubidium@9724: 			SetSignalStateByTrackdir(tile, trackdir, newstate);
rubidium@9724: 			MarkTileDirtyByTile(tile);
rubidium@9724: 		}
rubidium@9724: 	}
rubidium@9724: 
rubidium@9724: }
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /** Reset all sets after one set overflowed */
rubidium@9724: static inline void ResetSets()
rubidium@9724: {
rubidium@9724: 	_tbuset.Reset();
rubidium@9724: 	_tbdset.Reset();
rubidium@9724: 	_globset.Reset();
rubidium@9724: }
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Updates blocks in _globset buffer
rubidium@9724:  *
rubidium@9724:  * @param owner player whose signals we are updating
rubidium@10715:  * @return state of the first block from _globset
rubidium@9724:  * @pre IsValidPlayer(owner)
rubidium@9724:  */
glx@10645: static SigSegState UpdateSignalsInBuffer(Owner owner)
rubidium@9724: {
rubidium@9724: 	assert(IsValidPlayer(owner));
rubidium@9724: 
rubidium@9724: 	bool first = true;  // first block?
glx@10645: 	SigSegState state = SIGSEG_FREE; // value to return
rubidium@9724: 
rubidium@9724: 	TileIndex tile;
rubidium@9724: 	DiagDirection dir;
rubidium@9724: 
rubidium@9724: 	while (_globset.Get(&tile, &dir)) {
rubidium@9724: 		assert(_tbuset.IsEmpty());
rubidium@9724: 		assert(_tbdset.IsEmpty());
rubidium@9724: 
rubidium@9724: 		/* After updating signal, data stored are always MP_RAILWAY with signals.
rubidium@9724: 		 * Other situations happen when data are from outside functions -
rubidium@9724: 		 * modification of railbits (including both rail building and removal),
rubidium@9724: 		 * train entering/leaving block, train leaving depot...
rubidium@9724: 		 */
rubidium@9724: 		switch (GetTileType(tile)) {
rubidium@9724: 			case MP_TUNNELBRIDGE:
rubidium@9724: 				/* 'optimization assert' - do not try to update signals when it is not needed */
rubidium@9724: 				assert(GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL);
rubidium@9724: 				assert(dir == INVALID_DIAGDIR || dir == ReverseDiagDir(GetTunnelBridgeDirection(tile)));
rubidium@9724: 				_tbdset.Add(tile, INVALID_DIAGDIR);  // we can safely start from wormhole centre
rubidium@9724: 				_tbdset.Add(GetOtherTunnelBridgeEnd(tile), INVALID_DIAGDIR);
rubidium@9724: 				break;
rubidium@9724: 
rubidium@9724: 			case MP_RAILWAY:
rubidium@9724: 				if (IsRailDepot(tile)) {
rubidium@9724: 					/* 'optimization assert' do not try to update signals in other cases */
rubidium@9724: 					assert(dir == INVALID_DIAGDIR || dir == GetRailDepotDirection(tile));
rubidium@9724: 					_tbdset.Add(tile, INVALID_DIAGDIR); // start from depot inside
rubidium@9724: 					break;
rubidium@9724: 				}
rubidium@9724: 				/* FALLTHROUGH */
rubidium@9724: 			case MP_STATION:
rubidium@9724: 			case MP_ROAD:
glx@9732: 				if ((TrackStatusToTrackBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0)) & _enterdir_to_trackbits[dir]) != TRACK_BIT_NONE) {
rubidium@10249: 					/* only add to set when there is some 'interesting' track */
rubidium@9724: 					_tbdset.Add(tile, dir);
rubidium@9724: 					_tbdset.Add(tile + TileOffsByDiagDir(dir), ReverseDiagDir(dir));
rubidium@9724: 					break;
rubidium@9724: 				}
rubidium@9724: 				/* FALLTHROUGH */
rubidium@9724: 			default:
rubidium@9724: 				/* jump to next tile */
rubidium@9724: 				tile = tile + TileOffsByDiagDir(dir);
rubidium@9724: 				dir = ReverseDiagDir(dir);
glx@9732: 				if ((TrackStatusToTrackBits(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0)) & _enterdir_to_trackbits[dir]) != TRACK_BIT_NONE) {
rubidium@9724: 					_tbdset.Add(tile, dir);
rubidium@9724: 					break;
rubidium@9724: 				}
rubidium@9724: 				/* happens when removing a rail that wasn't connected at one or both sides */
rubidium@9724: 				continue; // continue the while() loop
rubidium@9724: 		}
rubidium@9724: 
rubidium@9724: 		assert(!_tbdset.Overflowed()); // it really shouldn't overflow by these one or two items
rubidium@9724: 		assert(!_tbdset.IsEmpty()); // it wouldn't hurt anyone, but shouldn't happen too
rubidium@9724: 
rubidium@9724: 		SigFlags flags = ExploreSegment(owner);
rubidium@9724: 
rubidium@9724: 		if (first) {
rubidium@9724: 			first = false;
glx@10645: 			if ((flags & SF_TRAIN) || (flags & SF_EXIT && !(flags & SF_GREEN)) || (flags & SF_FULL)) {
glx@10645: 				/* SIGSEG_FREE is set by default */
glx@10645: 				state = SIGSEG_FULL;
glx@10645: 			}
rubidium@9724: 		}
rubidium@9724: 
rubidium@9724: 		/* do not do anything when some buffer was full */
rubidium@9724: 		if (flags & SF_FULL) {
rubidium@9724: 			ResetSets(); // free all sets
rubidium@9724: 			break;
rubidium@9724: 		}
rubidium@9724: 
rubidium@9724: 		UpdateSignalsAroundSegment(flags);
rubidium@9724: 	}
rubidium@9724: 
rubidium@9724: 	return state;
rubidium@9724: }
rubidium@9724: 
rubidium@9724: 
rubidium@9724: static Owner _last_owner = INVALID_OWNER; ///< last owner whose track was put into _globset
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Update signals in buffer
rubidium@9724:  * Called from 'outside'
rubidium@9724:  */
rubidium@9724: void UpdateSignalsInBuffer()
rubidium@9724: {
rubidium@9724: 	if (!_globset.IsEmpty()) {
rubidium@9724: 		UpdateSignalsInBuffer(_last_owner);
rubidium@9724: 		_last_owner = INVALID_OWNER; // invalidate
rubidium@9724: 	}
rubidium@9724: }
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Add track to signal update buffer
rubidium@9724:  *
rubidium@9724:  * @param tile tile where we start
rubidium@9724:  * @param track track at which ends we will update signals
rubidium@9724:  * @param owner owner whose signals we will update
rubidium@9724:  */
rubidium@9724: void AddTrackToSignalBuffer(TileIndex tile, Track track, Owner owner)
rubidium@9724: {
rubidium@9724: 	static const DiagDirection _search_dir_1[] = {
rubidium@9724: 		DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_SW, DIAGDIR_SE
rubidium@9724: 	};
rubidium@9724: 	static const DiagDirection _search_dir_2[] = {
rubidium@9724: 		DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NE
rubidium@9724: 	};
rubidium@9724: 
rubidium@9724: 	/* do not allow signal updates for two players in one run */
rubidium@9724: 	assert(_globset.IsEmpty() || owner == _last_owner);
rubidium@9724: 
rubidium@9724: 	_last_owner = owner;
rubidium@9724: 
rubidium@9724: 	_globset.Add(tile, _search_dir_1[track]);
rubidium@9724: 	_globset.Add(tile, _search_dir_2[track]);
rubidium@9724: 
rubidium@9724: 	if (_globset.Items() >= SIG_GLOB_UPDATE) {
rubidium@9724: 		/* too many items, force update */
rubidium@9724: 		UpdateSignalsInBuffer(_last_owner);
rubidium@9724: 		_last_owner = INVALID_OWNER;
rubidium@9724: 	}
rubidium@9724: }
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Add side of tile to signal update buffer
rubidium@9724:  *
rubidium@9724:  * @param tile tile where we start
rubidium@9724:  * @param side side of tile
rubidium@9724:  * @param owner owner whose signals we will update
rubidium@9724:  */
rubidium@9724: void AddSideToSignalBuffer(TileIndex tile, DiagDirection side, Owner owner)
rubidium@9724: {
rubidium@9724: 	/* do not allow signal updates for two players in one run */
rubidium@9724: 	assert(_globset.IsEmpty() || owner == _last_owner);
rubidium@9724: 
rubidium@9724: 	_last_owner = owner;
rubidium@9724: 
rubidium@9724: 	_globset.Add(tile, side);
rubidium@9724: 
rubidium@9724: 	if (_globset.Items() >= SIG_GLOB_UPDATE) {
rubidium@9724: 		/* too many items, force update */
rubidium@9724: 		UpdateSignalsInBuffer(_last_owner);
rubidium@9724: 		_last_owner = INVALID_OWNER;
rubidium@9724: 	}
rubidium@9724: }
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Update signals, starting at one side of a tile
rubidium@9724:  * Will check tile next to this at opposite side too
rubidium@9724:  *
rubidium@9724:  * @see UpdateSignalsInBuffer()
rubidium@9724:  * @param tile tile where we start
rubidium@9724:  * @param side side of tile
rubidium@9724:  * @param owner owner whose signals we will update
rubidium@10715:  * @return the state of the signal segment
rubidium@9724:  */
glx@10645: SigSegState UpdateSignalsOnSegment(TileIndex tile, DiagDirection side, Owner owner)
rubidium@9724: {
rubidium@9724: 	assert(_globset.IsEmpty());
rubidium@9724: 	_globset.Add(tile, side);
rubidium@9724: 
rubidium@9724: 	return UpdateSignalsInBuffer(owner);
rubidium@9724: }
rubidium@9724: 
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Update signals at segments that are at both ends of
rubidium@9724:  * given (existent or non-existent) track
rubidium@9724:  *
rubidium@9724:  * @see UpdateSignalsInBuffer()
rubidium@9724:  * @param tile tile where we start
rubidium@9724:  * @param track track at which ends we will update signals
rubidium@9724:  * @param owner owner whose signals we will update
rubidium@9724:  */
rubidium@9724: void SetSignalsOnBothDir(TileIndex tile, Track track, Owner owner)
rubidium@9724: {
rubidium@9724: 	assert(_globset.IsEmpty());
rubidium@9724: 
rubidium@9724: 	AddTrackToSignalBuffer(tile, track, owner);
rubidium@9724: 	UpdateSignalsInBuffer(owner);
rubidium@9724: }