575 lines
20 KiB
C++
575 lines
20 KiB
C++
/* $Id$ */
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/** @file yapf_costrail.hpp Cost determination for rails. */
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#ifndef YAPF_COSTRAIL_HPP
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#define YAPF_COSTRAIL_HPP
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#include "../pbs.h"
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template <class Types>
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class CYapfCostRailT
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: public CYapfCostBase
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, public CostRailSettings
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{
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public:
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typedef typename Types::Tpf Tpf; ///< the pathfinder class (derived from THIS class)
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typedef typename Types::TrackFollower TrackFollower;
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typedef typename Types::NodeList::Titem Node; ///< this will be our node type
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typedef typename Node::Key Key; ///< key to hash tables
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typedef typename Node::CachedData CachedData;
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protected:
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/* Structure used inside PfCalcCost() to keep basic tile information. */
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struct TILE {
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TileIndex tile;
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Trackdir td;
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TileType tile_type;
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RailType rail_type;
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TILE()
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{
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tile = INVALID_TILE;
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td = INVALID_TRACKDIR;
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tile_type = MP_VOID;
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rail_type = INVALID_RAILTYPE;
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}
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TILE(TileIndex tile, Trackdir td)
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{
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this->tile = tile;
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this->td = td;
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this->tile_type = GetTileType(tile);
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this->rail_type = GetTileRailType(tile);
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}
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TILE(const TILE &src)
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{
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tile = src.tile;
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td = src.td;
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tile_type = src.tile_type;
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rail_type = src.rail_type;
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}
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};
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protected:
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int m_max_cost;
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CBlobT<int> m_sig_look_ahead_costs;
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bool m_disable_cache;
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public:
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bool m_stopped_on_first_two_way_signal;
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protected:
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static const int s_max_segment_cost = 10000;
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CYapfCostRailT()
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: m_max_cost(0)
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, m_disable_cache(false)
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, m_stopped_on_first_two_way_signal(false)
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{
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// pre-compute look-ahead penalties into array
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int p0 = Yapf().PfGetSettings().rail_look_ahead_signal_p0;
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int p1 = Yapf().PfGetSettings().rail_look_ahead_signal_p1;
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int p2 = Yapf().PfGetSettings().rail_look_ahead_signal_p2;
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int *pen = m_sig_look_ahead_costs.GrowSizeNC(Yapf().PfGetSettings().rail_look_ahead_max_signals);
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for (uint i = 0; i < Yapf().PfGetSettings().rail_look_ahead_max_signals; i++)
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pen[i] = p0 + i * (p1 + i * p2);
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}
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/// to access inherited path finder
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Tpf& Yapf() {return *static_cast<Tpf*>(this);}
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public:
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FORCEINLINE int SlopeCost(TileIndex tile, Trackdir td)
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{
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CPerfStart perf_cost(Yapf().m_perf_slope_cost);
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if (!stSlopeCost(tile, td)) return 0;
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return Yapf().PfGetSettings().rail_slope_penalty;
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}
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FORCEINLINE int CurveCost(Trackdir td1, Trackdir td2)
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{
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assert(IsValidTrackdir(td1));
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assert(IsValidTrackdir(td2));
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int cost = 0;
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if (TrackFollower::Allow90degTurns()
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&& ((TrackdirToTrackdirBits(td2) & (TrackdirBits)TrackdirCrossesTrackdirs(td1)) != 0)) {
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// 90-deg curve penalty
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cost += Yapf().PfGetSettings().rail_curve90_penalty;
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} else if (td2 != NextTrackdir(td1)) {
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// 45-deg curve penalty
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cost += Yapf().PfGetSettings().rail_curve45_penalty;
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}
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return cost;
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}
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FORCEINLINE int SwitchCost(TileIndex tile1, TileIndex tile2, DiagDirection exitdir)
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{
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if (IsTileType(tile1, MP_RAILWAY) && IsTileType(tile2, MP_RAILWAY)) {
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bool t1 = KillFirstBit(GetTrackBits(tile1) & DiagdirReachesTracks(ReverseDiagDir(exitdir))) != TRACK_BIT_NONE;
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bool t2 = KillFirstBit(GetTrackBits(tile2) & DiagdirReachesTracks(exitdir)) != TRACK_BIT_NONE;
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if (t1 && t2) return Yapf().PfGetSettings().rail_doubleslip_penalty;
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}
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return 0;
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}
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/** Return one tile cost (base cost + level crossing penalty). */
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FORCEINLINE int OneTileCost(TileIndex& tile, Trackdir trackdir)
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{
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int cost = 0;
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// set base cost
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if (IsDiagonalTrackdir(trackdir)) {
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cost += YAPF_TILE_LENGTH;
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switch (GetTileType(tile)) {
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case MP_ROAD:
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/* Increase the cost for level crossings */
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if (IsLevelCrossing(tile))
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cost += Yapf().PfGetSettings().rail_crossing_penalty;
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break;
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default:
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break;
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}
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} else {
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// non-diagonal trackdir
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cost = YAPF_TILE_CORNER_LENGTH;
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}
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return cost;
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}
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/** Check for a reserved station platform. */
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FORCEINLINE bool IsAnyStationTileReserved(TileIndex tile, Trackdir trackdir, int skipped)
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{
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TileIndexDiff diff = TileOffsByDiagDir(TrackdirToExitdir(ReverseTrackdir(trackdir)));
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for (; skipped >= 0; skipped--, tile += diff) {
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if (GetRailwayStationReservation(tile)) return true;
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}
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return false;
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}
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/** The cost for reserved tiles, including skipped ones. */
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FORCEINLINE int ReservationCost(Node& n, TileIndex tile, Trackdir trackdir, int skipped)
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{
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if (n.m_num_signals_passed >= m_sig_look_ahead_costs.Size() / 2) return 0;
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if (IsRailwayStationTile(tile) && IsAnyStationTileReserved(tile, trackdir, skipped)) {
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return Yapf().PfGetSettings().rail_pbs_station_penalty * (skipped + 1);
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} else if (TrackOverlapsTracks(GetReservedTrackbits(tile), TrackdirToTrack(trackdir))) {
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int cost = Yapf().PfGetSettings().rail_pbs_cross_penalty;
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if (!IsDiagonalTrackdir(trackdir)) cost = (cost * YAPF_TILE_CORNER_LENGTH) / YAPF_TILE_LENGTH;
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return cost * (skipped + 1);
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}
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return 0;
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}
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int SignalCost(Node& n, TileIndex tile, Trackdir trackdir)
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{
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int cost = 0;
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// if there is one-way signal in the opposite direction, then it is not our way
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CPerfStart perf_cost(Yapf().m_perf_other_cost);
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if (IsTileType(tile, MP_RAILWAY)) {
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bool has_signal_against = HasSignalOnTrackdir(tile, ReverseTrackdir(trackdir));
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bool has_signal_along = HasSignalOnTrackdir(tile, trackdir);
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if (has_signal_against && !has_signal_along && IsOnewaySignal(tile, TrackdirToTrack(trackdir))) {
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// one-way signal in opposite direction
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n.m_segment->m_end_segment_reason |= ESRB_DEAD_END;
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} else {
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if (has_signal_along) {
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SignalState sig_state = GetSignalStateByTrackdir(tile, trackdir);
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// cache the look-ahead polynomial constant only if we didn't pass more signals than the look-ahead limit is
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int look_ahead_cost = (n.m_num_signals_passed < m_sig_look_ahead_costs.Size()) ? m_sig_look_ahead_costs.Data()[n.m_num_signals_passed] : 0;
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if (sig_state != SIGNAL_STATE_RED) {
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// green signal
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n.flags_u.flags_s.m_last_signal_was_red = false;
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// negative look-ahead red-signal penalties would cause problems later, so use them as positive penalties for green signal
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if (look_ahead_cost < 0) {
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// add its negation to the cost
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cost -= look_ahead_cost;
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}
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} else {
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SignalType sig_type = GetSignalType(tile, TrackdirToTrack(trackdir));
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// we have a red signal in our direction
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// was it first signal which is two-way?
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if (!IsPbsSignal(sig_type) && Yapf().TreatFirstRedTwoWaySignalAsEOL() && n.flags_u.flags_s.m_choice_seen && has_signal_against && n.m_num_signals_passed == 0) {
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// yes, the first signal is two-way red signal => DEAD END
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n.m_segment->m_end_segment_reason |= ESRB_DEAD_END;
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Yapf().m_stopped_on_first_two_way_signal = true;
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return -1;
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}
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n.m_last_red_signal_type = sig_type;
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n.flags_u.flags_s.m_last_signal_was_red = true;
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// look-ahead signal penalty
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if (!IsPbsSignal(sig_type) && look_ahead_cost > 0) {
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// add the look ahead penalty only if it is positive
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cost += look_ahead_cost;
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}
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// special signal penalties
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if (n.m_num_signals_passed == 0) {
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switch (sig_type) {
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case SIGTYPE_COMBO:
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case SIGTYPE_EXIT: cost += Yapf().PfGetSettings().rail_firstred_exit_penalty; break; // first signal is red pre-signal-exit
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case SIGTYPE_NORMAL:
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case SIGTYPE_ENTRY: cost += Yapf().PfGetSettings().rail_firstred_penalty; break;
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default: break;
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};
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}
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}
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n.m_num_signals_passed++;
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n.m_segment->m_last_signal_tile = tile;
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n.m_segment->m_last_signal_td = trackdir;
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}
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if (has_signal_against && IsPbsSignal(GetSignalType(tile, TrackdirToTrack(trackdir)))) {
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cost += n.m_num_signals_passed < Yapf().PfGetSettings().rail_look_ahead_max_signals ? Yapf().PfGetSettings().rail_pbs_signal_back_penalty : 0;
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}
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}
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}
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return cost;
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}
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FORCEINLINE int PlatformLengthPenalty(int platform_length)
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{
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int cost = 0;
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const Vehicle *v = Yapf().GetVehicle();
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assert(v != NULL);
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assert(v->type == VEH_TRAIN);
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assert(v->u.rail.cached_total_length != 0);
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int needed_platform_length = (v->u.rail.cached_total_length + TILE_SIZE - 1) / TILE_SIZE;
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if (platform_length > needed_platform_length) {
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// apply penalty for longer platform than needed
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cost += Yapf().PfGetSettings().rail_longer_platform_penalty;
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} else if (needed_platform_length > platform_length) {
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// apply penalty for shorter platform than needed
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cost += Yapf().PfGetSettings().rail_shorter_platform_penalty;
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}
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return cost;
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}
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public:
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FORCEINLINE void SetMaxCost(int max_cost) {m_max_cost = max_cost;}
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/** Called by YAPF to calculate the cost from the origin to the given node.
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* Calculates only the cost of given node, adds it to the parent node cost
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* and stores the result into Node::m_cost member */
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FORCEINLINE bool PfCalcCost(Node &n, const TrackFollower *tf)
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{
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assert(!n.flags_u.flags_s.m_targed_seen);
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assert(tf->m_new_tile == n.m_key.m_tile);
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assert((TrackdirToTrackdirBits(n.m_key.m_td) & tf->m_new_td_bits) != TRACKDIR_BIT_NONE);
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CPerfStart perf_cost(Yapf().m_perf_cost);
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/* Does the node have some parent node? */
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bool has_parent = (n.m_parent != NULL);
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/* Do we already have a cached segment? */
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CachedData &segment = *n.m_segment;
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bool is_cached_segment = (segment.m_cost >= 0);
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int parent_cost = has_parent ? n.m_parent->m_cost : 0;
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/* Each node cost contains 2 or 3 main components:
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* 1. Transition cost - cost of the move from previous node (tile):
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* - curve cost (or zero for straight move)
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* 2. Tile cost:
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* - base tile cost
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* - YAPF_TILE_LENGTH for diagonal tiles
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* - YAPF_TILE_CORNER_LENGTH for non-diagonal tiles
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* - tile penalties
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* - tile slope penalty (upward slopes)
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* - red signal penalty
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* - level crossing penalty
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* - speed-limit penalty (bridges)
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* - station platform penalty
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* - penalty for reversing in the depot
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* - etc.
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* 3. Extra cost (applies to the last node only)
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* - last red signal penalty
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* - penalty for too long or too short platform on the destination station
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*/
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int transition_cost = 0;
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int extra_cost = 0;
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/* Segment: one or more tiles connected by contiguous tracks of the same type.
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* Each segment cost includes 'Tile cost' for all its tiles (including the first
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* and last), and the 'Transition cost' between its tiles. The first transition
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* cost of segment entry (move from the 'parent' node) is not included!
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*/
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int segment_entry_cost = 0;
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int segment_cost = 0;
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const Vehicle *v = Yapf().GetVehicle();
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// start at n.m_key.m_tile / n.m_key.m_td and walk to the end of segment
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TILE cur(n.m_key.m_tile, n.m_key.m_td);
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// the previous tile will be needed for transition cost calculations
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TILE prev = !has_parent ? TILE() : TILE(n.m_parent->GetLastTile(), n.m_parent->GetLastTrackdir());
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EndSegmentReasonBits end_segment_reason = ESRB_NONE;
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TrackFollower tf_local(v, Yapf().GetCompatibleRailTypes(), &Yapf().m_perf_ts_cost);
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if (!has_parent) {
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/* We will jump to the middle of the cost calculator assuming that segment cache is not used. */
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assert(!is_cached_segment);
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/* Skip the first transition cost calculation. */
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goto no_entry_cost;
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}
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for (;;) {
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/* Transition cost (cost of the move from previous tile) */
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transition_cost = Yapf().CurveCost(prev.td, cur.td);
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transition_cost += Yapf().SwitchCost(prev.tile, cur.tile, TrackdirToExitdir(prev.td));
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/* First transition cost counts against segment entry cost, other transitions
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* inside segment will come to segment cost (and will be cached) */
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if (segment_cost == 0) {
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/* We just entered the loop. First transition cost goes to segment entry cost)*/
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segment_entry_cost = transition_cost;
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transition_cost = 0;
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/* It is the right time now to look if we can reuse the cached segment cost. */
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if (is_cached_segment) {
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/* Yes, we already know the segment cost. */
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segment_cost = segment.m_cost;
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/* We know also the reason why the segment ends. */
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end_segment_reason = segment.m_end_segment_reason;
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/* We will need also some information about the last signal (if it was red). */
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if (segment.m_last_signal_tile != INVALID_TILE) {
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assert(HasSignalOnTrackdir(segment.m_last_signal_tile, segment.m_last_signal_td));
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SignalState sig_state = GetSignalStateByTrackdir(segment.m_last_signal_tile, segment.m_last_signal_td);
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bool is_red = (sig_state == SIGNAL_STATE_RED);
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n.flags_u.flags_s.m_last_signal_was_red = is_red;
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if (is_red) {
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n.m_last_red_signal_type = GetSignalType(segment.m_last_signal_tile, TrackdirToTrack(segment.m_last_signal_td));
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}
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}
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/* No further calculation needed. */
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cur = TILE(n.GetLastTile(), n.GetLastTrackdir());
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break;
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}
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} else {
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/* Other than first transition cost count as the regular segment cost. */
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segment_cost += transition_cost;
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}
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no_entry_cost: // jump here at the beginning if the node has no parent (it is the first node)
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/* All other tile costs will be calculated here. */
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segment_cost += Yapf().OneTileCost(cur.tile, cur.td);
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/* If we skipped some tunnel/bridge/station tiles, add their base cost */
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segment_cost += YAPF_TILE_LENGTH * tf->m_tiles_skipped;
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/* Slope cost. */
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segment_cost += Yapf().SlopeCost(cur.tile, cur.td);
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/* Reserved tiles. */
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segment_cost += Yapf().ReservationCost(n, cur.tile, cur.td, tf->m_tiles_skipped);
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/* Signal cost (routine can modify segment data). */
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segment_cost += Yapf().SignalCost(n, cur.tile, cur.td);
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end_segment_reason = segment.m_end_segment_reason;
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/* Tests for 'potential target' reasons to close the segment. */
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if (cur.tile == prev.tile) {
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/* Penalty for reversing in a depot. */
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assert(IsRailDepot(cur.tile));
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segment_cost += Yapf().PfGetSettings().rail_depot_reverse_penalty;
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/* We will end in this pass (depot is possible target) */
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end_segment_reason |= ESRB_DEPOT;
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} else if (tf->m_is_station) {
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/* Station penalties. */
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uint platform_length = tf->m_tiles_skipped + 1;
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/* We don't know yet if the station is our target or not. Act like
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* if it is pass-through station (not our destination). */
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segment_cost += Yapf().PfGetSettings().rail_station_penalty * platform_length;
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/* We will end in this pass (station is possible target) */
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end_segment_reason |= ESRB_STATION;
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} else if (cur.tile_type == MP_RAILWAY && IsRailWaypoint(cur.tile)) {
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/* Waypoint is also a good reason to finish. */
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end_segment_reason |= ESRB_WAYPOINT;
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} else if (TrackFollower::DoTrackMasking() && cur.tile_type == MP_RAILWAY) {
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/* Searching for a safe tile? */
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if (HasSignalOnTrackdir(cur.tile, cur.td) && !IsPbsSignal(GetSignalType(cur.tile, TrackdirToTrack(cur.td)))) {
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end_segment_reason |= ESRB_SAFE_TILE;
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}
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}
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/* Apply min/max speed penalties only when inside the look-ahead radius. Otherwise
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* it would cause desync in MP. */
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if (n.m_num_signals_passed < m_sig_look_ahead_costs.Size())
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{
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int min_speed = 0;
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int max_speed = tf->GetSpeedLimit(&min_speed);
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if (max_speed < v->max_speed)
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extra_cost += YAPF_TILE_LENGTH * (v->max_speed - max_speed) * (4 + tf->m_tiles_skipped) / v->max_speed;
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if (min_speed > v->max_speed)
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extra_cost += YAPF_TILE_LENGTH * (min_speed - v->max_speed);
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}
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/* Finish if we already exceeded the maximum path cost (i.e. when
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* searching for the nearest depot). */
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if (m_max_cost > 0 && (parent_cost + segment_entry_cost + segment_cost) > m_max_cost) {
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end_segment_reason |= ESRB_PATH_TOO_LONG;
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}
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/* Move to the next tile/trackdir. */
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tf = &tf_local;
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tf_local.Init(v, Yapf().GetCompatibleRailTypes(), &Yapf().m_perf_ts_cost);
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if (!tf_local.Follow(cur.tile, cur.td)) {
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assert(tf_local.m_err != TrackFollower::EC_NONE);
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/* Can't move to the next tile (EOL?). */
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if (tf_local.m_err == TrackFollower::EC_RAIL_TYPE) {
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end_segment_reason |= ESRB_RAIL_TYPE;
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} else {
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end_segment_reason |= ESRB_DEAD_END;
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}
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if (TrackFollower::DoTrackMasking() && tf_local.m_err != TrackFollower::EC_90DEG) {
|
|
if (!HasOnewaySignalBlockingTrackdir(cur.tile, cur.td)) end_segment_reason |= ESRB_SAFE_TILE;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Check if the next tile is not a choice. */
|
|
if (KillFirstBit(tf_local.m_new_td_bits) != TRACKDIR_BIT_NONE) {
|
|
/* More than one segment will follow. Close this one. */
|
|
end_segment_reason |= ESRB_CHOICE_FOLLOWS;
|
|
break;
|
|
}
|
|
|
|
/* Gather the next tile/trackdir/tile_type/rail_type. */
|
|
TILE next(tf_local.m_new_tile, (Trackdir)FindFirstBit2x64(tf_local.m_new_td_bits));
|
|
|
|
if (TrackFollower::DoTrackMasking() && HasPbsSignalOnTrackdir(next.tile, next.td)) {
|
|
/* Possible safe tile. */
|
|
end_segment_reason |= ESRB_SAFE_TILE;
|
|
}
|
|
|
|
/* Check the next tile for the rail type. */
|
|
if (next.rail_type != cur.rail_type) {
|
|
/* Segment must consist from the same rail_type tiles. */
|
|
end_segment_reason |= ESRB_RAIL_TYPE;
|
|
break;
|
|
}
|
|
|
|
/* Avoid infinite looping. */
|
|
if (next.tile == n.m_key.m_tile && next.td == n.m_key.m_td) {
|
|
end_segment_reason |= ESRB_INFINITE_LOOP;
|
|
break;
|
|
}
|
|
|
|
if (segment_cost > s_max_segment_cost) {
|
|
/* Potentially in the infinite loop (or only very long segment?). We should
|
|
* not force it to finish prematurely unless we are on a regular tile. */
|
|
if (IsTileType(tf->m_new_tile, MP_RAILWAY)) {
|
|
end_segment_reason |= ESRB_SEGMENT_TOO_LONG;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Any other reason bit set? */
|
|
if (end_segment_reason != ESRB_NONE) {
|
|
break;
|
|
}
|
|
|
|
/* For the next loop set new prev and cur tile info. */
|
|
prev = cur;
|
|
cur = next;
|
|
|
|
} // for (;;)
|
|
|
|
bool target_seen = false;
|
|
if ((end_segment_reason & ESRB_POSSIBLE_TARGET) != ESRB_NONE) {
|
|
/* Depot, station or waypoint. */
|
|
if (Yapf().PfDetectDestination(cur.tile, cur.td)) {
|
|
/* Destination found. */
|
|
target_seen = true;
|
|
}
|
|
}
|
|
|
|
/* Update the segment if needed. */
|
|
if (!is_cached_segment) {
|
|
/* Write back the segment information so it can be reused the next time. */
|
|
segment.m_cost = segment_cost;
|
|
segment.m_end_segment_reason = end_segment_reason & ESRB_CACHED_MASK;
|
|
/* Save end of segment back to the node. */
|
|
n.SetLastTileTrackdir(cur.tile, cur.td);
|
|
}
|
|
|
|
/* Do we have an excuse why not to continue pathfinding in this direction? */
|
|
if (!target_seen && (end_segment_reason & ESRB_ABORT_PF_MASK) != ESRB_NONE) {
|
|
/* Reason to not continue. Stop this PF branch. */
|
|
return false;
|
|
}
|
|
|
|
/* Special costs for the case we have reached our target. */
|
|
if (target_seen) {
|
|
n.flags_u.flags_s.m_targed_seen = true;
|
|
/* Last-red and last-red-exit penalties. */
|
|
if (n.flags_u.flags_s.m_last_signal_was_red) {
|
|
if (n.m_last_red_signal_type == SIGTYPE_EXIT) {
|
|
// last signal was red pre-signal-exit
|
|
extra_cost += Yapf().PfGetSettings().rail_lastred_exit_penalty;
|
|
} else {
|
|
// last signal was red, but not exit
|
|
extra_cost += Yapf().PfGetSettings().rail_lastred_penalty;
|
|
}
|
|
}
|
|
|
|
/* Station platform-length penalty. */
|
|
if ((end_segment_reason & ESRB_STATION) != ESRB_NONE) {
|
|
Station *st = GetStationByTile(n.GetLastTile());
|
|
assert(st != NULL);
|
|
uint platform_length = st->GetPlatformLength(n.GetLastTile(), ReverseDiagDir(TrackdirToExitdir(n.GetLastTrackdir())));
|
|
/* Reduce the extra cost caused by passing-station penalty (each station receives it in the segment cost). */
|
|
extra_cost -= Yapf().PfGetSettings().rail_station_penalty * platform_length;
|
|
/* Add penalty for the inappropriate platform length. */
|
|
extra_cost += PlatformLengthPenalty(platform_length);
|
|
}
|
|
}
|
|
|
|
// total node cost
|
|
n.m_cost = parent_cost + segment_entry_cost + segment_cost + extra_cost;
|
|
|
|
return true;
|
|
}
|
|
|
|
FORCEINLINE bool CanUseGlobalCache(Node& n) const
|
|
{
|
|
return !m_disable_cache
|
|
&& (n.m_parent != NULL)
|
|
&& (n.m_parent->m_num_signals_passed >= m_sig_look_ahead_costs.Size());
|
|
}
|
|
|
|
FORCEINLINE void ConnectNodeToCachedData(Node& n, CachedData& ci)
|
|
{
|
|
n.m_segment = &ci;
|
|
if (n.m_segment->m_cost < 0) {
|
|
n.m_segment->m_last_tile = n.m_key.m_tile;
|
|
n.m_segment->m_last_td = n.m_key.m_td;
|
|
}
|
|
}
|
|
|
|
void DisableCache(bool disable)
|
|
{
|
|
m_disable_cache = disable;
|
|
}
|
|
};
|
|
|
|
|
|
|
|
#endif /* YAPF_COSTRAIL_HPP */
|