(svn r11802) -Fix [FS#716]: do not crash trains when leaving depot to a very long track
-Codechange: use dedicated pathfinder for signal updating, resulting in better performance and possible future improvementspull/155/head
parent
c004cc1fd9
commit
bc4ed3eafd
@ -0,0 +1,582 @@
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/* $Id$ */
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/** @file signal.cpp functions related to rail signals updating */
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#include "stdafx.h"
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#include "openttd.h"
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#include "debug.h"
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#include "tile_cmd.h"
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#include "rail_map.h"
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#include "road_map.h"
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#include "station_map.h"
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#include "tunnelbridge_map.h"
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#include "vehicle_func.h"
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#include "train.h"
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#include "newgrf_station.h"
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#include "functions.h"
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#include "track_type.h"
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#include "track_func.h"
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#include "signal_func.h"
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#include "player.h"
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/** these are the maximums used for updating signal blocks */
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enum {
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SIG_TBU_SIZE = 64, ///< number of signals entering to block
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SIG_TBD_SIZE = 256, ///< number of intersections - open nodes in current block
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SIG_GLOB_SIZE = 64, ///< number of open blocks (block can be opened more times until detected)
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};
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/** incidating trackbits with given enterdir */
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static const TrackBitsByte _enterdir_to_trackbits[DIAGDIR_END] = {
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{TRACK_BIT_3WAY_NE},
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{TRACK_BIT_3WAY_SE},
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{TRACK_BIT_3WAY_SW},
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{TRACK_BIT_3WAY_NW}
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};
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/** incidating trackdirbits with given enterdir */
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static const TrackdirBitsShort _enterdir_to_trackdirbits[DIAGDIR_END] = {
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{TRACKDIR_BIT_X_SW | TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_RIGHT_S},
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{TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_RIGHT_N},
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{TRACKDIR_BIT_X_NE | TRACKDIR_BIT_LOWER_E | TRACKDIR_BIT_LEFT_N},
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{TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_UPPER_E | TRACKDIR_BIT_LEFT_S}
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};
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/**
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* Set containing 'items' items of 'tile and Tdir'
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* No tree structure is used because it would cause
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* slowdowns in most usual cases
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*/
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template <typename Tdir, uint items>
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struct SmallSet {
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private:
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uint n; // actual number of units
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bool overflowed; // did we try to oveflow the set?
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const char *name; // name, used for debugging purposes...
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/** Element of set */
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struct SSdata {
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TileIndex tile;
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Tdir dir;
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} data[items];
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public:
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/** Constructor - just set default values and 'name' */
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SmallSet(const char *name) : n(0), overflowed(false), name(name) { }
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/** Reset variables to default values */
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void Reset()
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{
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this->n = 0;
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this->overflowed = false;
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}
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/**
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* Returns value of 'oveflowed'
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* @return did we try to overflow the set?
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*/
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bool Overflowed()
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{
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return this->overflowed;
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}
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/**
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* Checks for empty set
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* @return is the set empty?
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*/
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bool IsEmpty()
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{
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return this->n == 0;
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}
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/**
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* Checks for full set
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* @return is the set full?
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*/
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bool IsFull()
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{
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return this->n == lengthof(data);
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}
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/**
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* Tries to remove first instance of given tile and dir
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* @param tile tile
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* @param dir and dir to remove
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* @return element was found and removed
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*/
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bool Remove(TileIndex tile, Tdir dir)
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{
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for (uint i = 0; i < this->n; i++) {
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if (this->data[i].tile == tile && this->data[i].dir == dir) {
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this->data[i] = this->data[--this->n];
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return true;
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}
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}
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return false;
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}
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/**
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* Tries to find given tile and dir in the set
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* @param tile tile
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* @param dir and dir to find
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* @return true iff the tile & dir elemnt was found
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*/
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bool IsIn(TileIndex tile, Tdir dir)
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{
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for (uint i = 0; i < this->n; i++) {
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if (this->data[i].tile == tile && this->data[i].dir == dir) return true;
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}
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return false;
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}
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/**
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* Adds tile & dir into the set, checks for full set
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* Sets the 'overflowed' flag if the set was full
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* @param tile tile
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* @param dir and dir to add
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* @return true iff the item could be added (set wasn't full)
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*/
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bool Add(TileIndex tile, Tdir dir)
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{
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if (this->IsFull()) {
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overflowed = true;
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DEBUG(misc, 0, "SignalSegment too complex. Set %s is full (maximum %d)", name, items);
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return false; // set is full
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}
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this->data[this->n].tile = tile;
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this->data[this->n].dir = dir;
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this->n++;
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return true;
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}
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/**
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* Reads the last added element into the set
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* @param tile pointer where tile is written to
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* @param dir pointer where dir is written to
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* @return false iff the set was empty
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*/
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bool Get(TileIndex *tile, Tdir *dir)
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{
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if (this->n == 0) return false;
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this->n--;
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*tile = this->data[this->n].tile;
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*dir = this->data[this->n].dir;
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return true;
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}
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};
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static SmallSet<Trackdir, SIG_TBU_SIZE> _tbuset("_tbuset"); ///< set of signals that will be updated
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static SmallSet<DiagDirection, SIG_TBD_SIZE> _tbdset("_tbdset"); ///< set of open nodes in current signal block
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static SmallSet<DiagDirection, SIG_GLOB_SIZE> _globset("_globset"); ///< set of places to be updated in following runs
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/** Check whether there is a train on rail, not in a depot */
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static void *TrainOnTileEnum(Vehicle *v, void *)
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{
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if (v->type != VEH_TRAIN || v->u.rail.track == TRACK_BIT_DEPOT) return NULL;
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return v;
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}
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/**
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* Perform some operations before adding data into Todo set
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* The new and reverse direction is removed from _globset, because we are sure
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* it doesn't need to be checked again
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* Also, remove reverse direction from _tbdset
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* This is the 'core' part so the graph seaching won't enter any tile twice
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*
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* @param t1 tile we are entering
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* @param d1 direction (tile side) we are entering
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* @param t2 tile we are leaving
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* @param d2 direction (tile side) we are leaving
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* @return false iff reverse direction was in Todo set
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*/
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static inline bool CheckAddToTodoSet(TileIndex t1, DiagDirection d1, TileIndex t2, DiagDirection d2)
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{
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_globset.Remove(t1, d1); // it can be in Global but not in Todo
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_globset.Remove(t2, d2); // remove in all cases
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assert(!_tbdset.IsIn(t1, d1)); // it really shouldn't be there already
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if (_tbdset.Remove(t2, d2)) return false;
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return true;
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}
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/**
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* Perform some operations before adding data into Todo set
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* The new and reverse direction is removed from Global set, because we are sure
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* it doesn't need to be checked again
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* Also, remove reverse direction from Todo set
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* This is the 'core' part so the graph seaching won't enter any tile twice
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*
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* @param t1 tile we are entering
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* @param d1 direction (tile side) we are entering
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* @param t2 tile we are leaving
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* @param d2 direction (tile side) we are leaving
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* @return false iff the Todo buffer would be overrun
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*/
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static inline bool MaybeAddToTodoSet(TileIndex t1, DiagDirection d1, TileIndex t2, DiagDirection d2)
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{
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if (!CheckAddToTodoSet(t1, d1, t2, d2)) return true;
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return _tbdset.Add(t1, d1);
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}
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/** Current signal block state flags */
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enum SigFlags {
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SF_NONE = 0,
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SF_TRAIN = 1 << 0, ///< train found in segment
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SF_EXIT = 1 << 1, ///< exitsignal found
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SF_EXIT2 = 1 << 2, ///< two or more exits found
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SF_GREEN = 1 << 3, ///< green exitsignal found
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SF_GREEN2 = 1 << 4, ///< two or more green exits found
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SF_FULL = 1 << 5, ///< some of buffers was full, do not continue
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};
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DECLARE_ENUM_AS_BIT_SET(SigFlags)
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/**
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* Search signal block
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*
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* @param owner owner whose signals we are updating
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* @return SigFlags
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*/
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static SigFlags ExploreSegment(Owner owner)
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{
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SigFlags flags = SF_NONE;
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while (!_tbdset.IsEmpty()) {
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TileIndex tile;
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DiagDirection enterdir;
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_tbdset.Get(&tile, &enterdir);
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TileIndex oldtile = tile; // tile we are leaving
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DiagDirection exitdir = enterdir == INVALID_DIAGDIR ? INVALID_DIAGDIR : ReverseDiagDir(enterdir); // expected new exit direction (for straight line)
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switch (GetTileType(tile)) {
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case MP_RAILWAY: {
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if (GetTileOwner(tile) != owner) continue; // do not propagate signals on others' tiles (remove for tracksharing)
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if (IsRailDepot(tile)) {
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if (enterdir == INVALID_DIAGDIR) { // from 'inside' - train just entered or left the depot
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if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
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exitdir = GetRailDepotDirection(tile);
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tile += TileOffsByDiagDir(exitdir);
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enterdir = ReverseDiagDir(exitdir);
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break;
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} else if (enterdir == GetRailDepotDirection(tile)) { // entered a depot
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if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
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continue;
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} else {
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continue;
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}
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}
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if (GetRailTileType(tile) == RAIL_TILE_WAYPOINT) {
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if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
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tile += TileOffsByDiagDir(exitdir);
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/* enterdir and exitdir stay the same */
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break;
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}
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TrackBits tracks = GetTrackBits(tile); // trackbits of tile
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TrackBits tracks_masked = (TrackBits)(tracks & _enterdir_to_trackbits[enterdir]); // only incidating trackbits
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if (tracks == TRACK_BIT_HORZ || tracks == TRACK_BIT_VERT) { // there is exactly one incidating track, no need to check
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tracks = tracks_masked;
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if (!(flags & SF_TRAIN) && VehicleFromPos(tile, &tracks, &EnsureNoTrainOnTrackProc)) flags |= SF_TRAIN;
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} else {
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if (tracks_masked == TRACK_BIT_NONE) continue; // no incidating track
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if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
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}
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if (HasSignals(tile)) { // there is exactly one track - not zero, because there is exit from this tile
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Track track = TrackBitsToTrack(tracks_masked); // mask TRACK_BIT_X and Y too
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if (HasSignalOnTrack(tile, track)) { // now check whole track, not trackdir
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SignalType sig = GetSignalType(tile, track);
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Trackdir trackdir = (Trackdir)FindFirstBit((tracks * 0x101) & _enterdir_to_trackdirbits[enterdir]);
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Trackdir reversedir = ReverseTrackdir(trackdir);
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/* add (tile, reversetrackdir) to 'to-be-updated' set when there is
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* ANY signal in REVERSE direction
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* (if it is a presignal EXIT and it changes, it will be added to 'to-be-done' set later) */
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if (HasSignalOnTrackdir(tile, reversedir)) {
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if (!_tbuset.Add(tile, reversedir)) return flags | SF_FULL;
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}
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/* if it is a presignal EXIT in OUR direction and we haven't found 2 green exits yes, do special check */
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if (!(flags & SF_GREEN2) && (sig & SIGTYPE_EXIT) && HasSignalOnTrackdir(tile, trackdir)) { // found presignal exit
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if (flags & SF_EXIT) flags |= SF_EXIT2; // found two (or more) exits
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flags |= SF_EXIT; // found at least one exit - allow for compiler optimizations
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if (GetSignalStateByTrackdir(tile, trackdir) == SIGNAL_STATE_GREEN) { // found green presignal exit
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if (flags & SF_GREEN) flags |= SF_GREEN2;
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flags |= SF_GREEN;
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}
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}
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continue;
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}
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}
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for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) { // test all possible exit directions
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if (dir != enterdir && tracks & _enterdir_to_trackbits[dir]) { // any track incidating?
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TileIndex newtile = tile + TileOffsByDiagDir(dir); // new tile to check
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DiagDirection newdir = ReverseDiagDir(dir); // direction we are entering from
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if (!MaybeAddToTodoSet(newtile, newdir, tile, dir)) return flags | SF_FULL;
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}
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}
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continue; // continue the while() loop
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}
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case MP_STATION:
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if (!IsRailwayStation(tile)) continue;
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if (GetTileOwner(tile) != owner) continue;
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if (DiagDirToAxis(enterdir) != GetRailStationAxis(tile)) continue; // different axis
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if (IsStationTileBlocked(tile)) continue; // 'eye-candy' station tile
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if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
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tile += TileOffsByDiagDir(exitdir);
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break;
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case MP_ROAD:
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if (!IsLevelCrossing(tile)) continue;
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if (GetTileOwner(tile) != owner) continue;
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if (DiagDirToAxis(enterdir) == GetCrossingRoadAxis(tile)) continue; // different axis
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if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
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tile += TileOffsByDiagDir(exitdir);
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break;
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case MP_TUNNELBRIDGE: {
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if (GetTileOwner(tile) != owner) continue;
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if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) continue;
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DiagDirection dir = GetTunnelBridgeDirection(tile);
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if (enterdir == INVALID_DIAGDIR) { // incoming from the wormhole
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if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
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enterdir = dir;
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exitdir = ReverseDiagDir(dir);
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tile += TileOffsByDiagDir(exitdir); // just skip to next tile
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} else { // NOT incoming from the wormhole!
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if (ReverseDiagDir(enterdir) != dir) continue;
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if (!(flags & SF_TRAIN) && VehicleFromPos(tile, NULL, &TrainOnTileEnum)) flags |= SF_TRAIN;
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tile = GetOtherTunnelBridgeEnd(tile); // just skip to exit tile
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enterdir = INVALID_DIAGDIR;
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exitdir = INVALID_DIAGDIR;
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}
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}
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break;
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default:
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continue; // continue the while() loop
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}
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if (!MaybeAddToTodoSet(tile, enterdir, oldtile, exitdir)) return flags | SF_FULL;
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}
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return flags;
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}
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/**
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* Update signals around segment in _tbuset
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*
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* @param flags info about segment
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*/
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static void UpdateSignalsAroundSegment(SigFlags flags)
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{
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while (!_tbuset.IsEmpty()) {
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TileIndex tile;
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Trackdir trackdir;
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_tbuset.Get(&tile, &trackdir);
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assert(HasSignalOnTrackdir(tile, trackdir));
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SignalType sig = GetSignalType(tile, TrackdirToTrack(trackdir));
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SignalState newstate = SIGNAL_STATE_GREEN;
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/* determine whether the new state is red */
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if (flags & SF_TRAIN) {
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/* train in the segment */
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newstate = SIGNAL_STATE_RED;
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} else {
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/* is it a bidir combo? - then do not count its other signal direction as exit */
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if (sig == SIGTYPE_COMBO && HasSignalOnTrackdir(tile, ReverseTrackdir(trackdir))) {
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/* at least one more exit */
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if (flags & SF_EXIT2 &&
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/* no green exit */
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(!(flags & SF_GREEN) ||
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/* only one green exit, and it is this one - so all other exits are red */
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(!(flags & SF_GREEN2) && GetSignalStateByTrackdir(tile, ReverseTrackdir(trackdir)) == SIGNAL_STATE_GREEN))) {
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newstate = SIGNAL_STATE_RED;
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}
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} else { // entry, at least one exit, no green exit
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if (sig & SIGTYPE_ENTRY && (flags & SF_EXIT && !(flags & SF_GREEN))) newstate = SIGNAL_STATE_RED;
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}
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}
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/* only when the state changes */
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if (newstate != GetSignalStateByTrackdir(tile, trackdir)) {
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if (sig & SIGTYPE_EXIT) {
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/* for pre-signal exits, add block to the global set */
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DiagDirection exitdir = TrackdirToExitdir(ReverseTrackdir(trackdir));
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_globset.Add(tile, exitdir); // do not check for full global set, first update all signals
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}
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SetSignalStateByTrackdir(tile, trackdir, newstate);
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MarkTileDirtyByTile(tile);
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}
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}
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}
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/** Reset all sets after one set overflowed */
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static inline void ResetSets()
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{
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_tbuset.Reset();
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_tbdset.Reset();
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_globset.Reset();
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}
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/**
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* Updates blocks in _globset buffer
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*
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* @return false iff presignal entry would be green (needed for trains leaving depot)
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||||
*/
|
||||
static bool UpdateSignalsInBuffer()
|
||||
{
|
||||
bool first = true; // first block?
|
||||
bool state = false; // value to return
|
||||
|
||||
Owner owner = OWNER_NONE; // owner whose signals we are updating
|
||||
|
||||
while (!_globset.IsEmpty()) {
|
||||
assert(_tbuset.IsEmpty());
|
||||
assert(_tbdset.IsEmpty());
|
||||
|
||||
TileIndex tile;
|
||||
DiagDirection dir;
|
||||
|
||||
_globset.Get(&tile, &dir);
|
||||
|
||||
/* After updating signal, data stored are always MP_RAILWAY with signals.
|
||||
* Other situations happen when data are from outside functions -
|
||||
* modification of railbits (including both rail building and removal),
|
||||
* train entering/leaving block, train leaving depot...
|
||||
*/
|
||||
switch (GetTileType(tile)) {
|
||||
case MP_TUNNELBRIDGE:
|
||||
/* 'optimization assert' - do not try to update signals when it is not needed */
|
||||
assert(GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL);
|
||||
assert(dir == INVALID_DIAGDIR || dir == ReverseDiagDir(GetTunnelBridgeDirection(tile)));
|
||||
if (first) owner = GetTileOwner(tile);
|
||||
_tbdset.Add(tile, INVALID_DIAGDIR); // we can safely start from wormhole centre
|
||||
_tbdset.Add(GetOtherTunnelBridgeEnd(tile), INVALID_DIAGDIR);
|
||||
break;
|
||||
|
||||
case MP_RAILWAY:
|
||||
if (IsRailDepot(tile)) {
|
||||
/* 'optimization assert' do not try to update signals in other cases */
|
||||
assert(dir == INVALID_DIAGDIR || dir == GetRailDepotDirection(tile));
|
||||
if (first) owner = GetTileOwner(tile);
|
||||
_tbdset.Add(tile, INVALID_DIAGDIR); // start from depot inside
|
||||
break;
|
||||
}
|
||||
/* FALLTHROUGH */
|
||||
case MP_STATION:
|
||||
case MP_ROAD:
|
||||
if ((TrackBits)(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0) & _enterdir_to_trackbits[dir]) != TRACK_BIT_NONE) {
|
||||
/* only add to set when there is some 'interesting' track */
|
||||
if (first) owner = GetTileOwner(tile);
|
||||
_tbdset.Add(tile, dir);
|
||||
_tbdset.Add(tile + TileOffsByDiagDir(dir), ReverseDiagDir(dir));
|
||||
break;
|
||||
}
|
||||
/* FALLTHROUGH */
|
||||
default:
|
||||
/* jump to next tile */
|
||||
tile = tile + TileOffsByDiagDir(dir);
|
||||
dir = ReverseDiagDir(dir);
|
||||
if ((TrackBits)(GetTileTrackStatus(tile, TRANSPORT_RAIL, 0) & _enterdir_to_trackbits[dir]) != TRACK_BIT_NONE) {
|
||||
if (first) owner = GetTileOwner(tile);
|
||||
_tbdset.Add(tile, dir);
|
||||
break;
|
||||
}
|
||||
/* happens when removing a rail that wasn't connected at one or both sides */
|
||||
continue; // continue the while() loop
|
||||
}
|
||||
|
||||
assert(IsValidPlayer(owner));
|
||||
assert(!_tbdset.Overflowed()); // it really shouldn't overflow by these one or two items
|
||||
assert(!_tbdset.IsEmpty()); // it wouldn't hurt anyone, but shouldn't happen too
|
||||
|
||||
SigFlags flags = ExploreSegment(owner);
|
||||
|
||||
if (first) {
|
||||
first = false;
|
||||
state = (flags & SF_TRAIN) || (flags & SF_EXIT && !(flags & SF_GREEN)) || (flags & SF_FULL); // true iff train CAN'T leave the depot
|
||||
}
|
||||
|
||||
/* do not do anything when some buffer was full */
|
||||
if (flags & SF_FULL) break;
|
||||
|
||||
UpdateSignalsAroundSegment(flags);
|
||||
}
|
||||
|
||||
return state;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Update signals, starting at one side of a tile
|
||||
* Will check tile next to this at opposite side too
|
||||
*
|
||||
* @see UpdateSignalsInBuffer()
|
||||
* @param tile tile where we start
|
||||
* @param side side of tile
|
||||
* @return false iff train can leave depot
|
||||
*/
|
||||
bool UpdateSignalsOnSegment(TileIndex tile, DiagDirection side)
|
||||
{
|
||||
assert(_globset.IsEmpty());
|
||||
_globset.Add(tile, side);
|
||||
|
||||
return UpdateSignalsInBuffer();
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Update signals at segments that are at both ends of
|
||||
* given (existent or non-existent) track
|
||||
*
|
||||
* @see UpdateSignalsInBuffer()
|
||||
* @param tile tile where we start
|
||||
* @param track track at which ends we will update signals
|
||||
*/
|
||||
void SetSignalsOnBothDir(TileIndex tile, Track track)
|
||||
{
|
||||
static const DiagDirection _search_dir_1[] = {
|
||||
DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_SW, DIAGDIR_SE
|
||||
};
|
||||
static const DiagDirection _search_dir_2[] = {
|
||||
DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NE
|
||||
};
|
||||
|
||||
assert(_globset.IsEmpty());
|
||||
|
||||
_globset.Add(tile, _search_dir_1[track]);
|
||||
_globset.Add(tile, _search_dir_2[track]);
|
||||
UpdateSignalsInBuffer();
|
||||
}
|
Loading…
Reference in New Issue