yapf_node_rail.hpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef YAPF_NODE_RAIL_HPP
#define YAPF_NODE_RAIL_HPP
 
#include "../../misc/dbg_helpers.h"
#include "../../train.h"
#include "nodelist.hpp"
#include "yapf_node.hpp"
#include "yapf_type.hpp"
 
struct CYapfRailSegmentKey {
  uint32_t value;
 
  inline CYapfRailSegmentKey(const CYapfNodeKeyTrackDir &node_key)
  {
    this->Set(node_key);
  }
 
  inline void Set(const CYapfRailSegmentKey &src)
  {
    this->value = src.value;
  }
 
  inline void Set(const CYapfNodeKeyTrackDir &node_key)
  {
    this->value = (node_key.tile.base() << 4) | node_key.td;
  }
 
  inline int32_t CalcHash() const
  {
    return this->value;
  }
 
  inline TileIndex GetTile() const
  {
    return (TileIndex)(this->value >> 4);
  }
 
  inline Trackdir GetTrackdir() const
  {
    return (Trackdir)(this->value & 0x0F);
  }
 
  inline bool operator==(const CYapfRailSegmentKey &other) const
  {
    return this->value == other.value;
  }
 
  void Dump(DumpTarget &dmp) const
  {
    dmp.WriteTile("tile", this->GetTile());
    dmp.WriteEnumT("td", this->GetTrackdir());
  }
};
 
struct CYapfRailSegment {
  typedef CYapfRailSegmentKey Key;
 
  CYapfRailSegmentKey key;
  TileIndex last_tile = INVALID_TILE;
  Trackdir last_td = INVALID_TRACKDIR;
  int cost = -1;
  TileIndex last_signal_tile = INVALID_TILE;
  Trackdir last_signal_td = INVALID_TRACKDIR;
  EndSegmentReasons end_segment_reason{};
  CYapfRailSegment *hash_next = nullptr;
 
  inline CYapfRailSegment(const CYapfRailSegmentKey &key) : key(key) {}
 
  inline const Key &GetKey() const
  {
    return this->key;
  }
 
  inline TileIndex GetTile() const
  {
    return this->key.GetTile();
  }
 
  inline CYapfRailSegment *GetHashNext()
  {
    return this->hash_next;
  }
 
  inline void SetHashNext(CYapfRailSegment *next)
  {
    this->hash_next = next;
  }
 
  void Dump(DumpTarget &dmp) const
  {
    dmp.WriteStructT("key", &this->key);
    dmp.WriteTile("last_tile", this->last_tile);
    dmp.WriteEnumT("last_td", this->last_td);
    dmp.WriteValue("cost", this->cost);
    dmp.WriteTile("last_signal_tile", this->last_signal_tile);
    dmp.WriteEnumT("last_signal_td", this->last_signal_td);
    dmp.WriteEnumT("end_segment_reason", this->end_segment_reason);
  }
};
 
struct CYapfRailNode : CYapfNodeT<CYapfNodeKeyTrackDir, CYapfRailNode> {
  typedef CYapfNodeT<CYapfNodeKeyTrackDir, CYapfRailNode> base;
  typedef CYapfRailSegment CachedData;
 
  CYapfRailSegment *segment;
  uint16_t num_signals_passed;
  union {
    uint32_t inherited_flags;
    struct {
      bool target_seen;
      bool choice_seen;
      bool last_signal_was_red;
    } flags_s;
  } flags_u;
  SignalType last_red_signal_type;
  SignalType last_signal_type;
 
  inline void Set(CYapfRailNode *parent, TileIndex tile, Trackdir td, bool is_choice)
  {
    this->base::Set(parent, tile, td, is_choice);
    this->segment = nullptr;
    if (parent == nullptr) {
      this->num_signals_passed      = 0;
      this->flags_u.inherited_flags = 0;
      this->last_red_signal_type    = SIGTYPE_BLOCK;
      /* We use PBS as initial signal type because if we are in
       * a PBS section and need to route, i.e. we're at a safe
       * waiting point of a station, we need to account for the
       * reservation costs. If we are in a normal block then we
       * should be alone in there and as such the reservation
       * costs should be 0 anyway. If there would be another
       * train in the block, i.e. passing signals at danger
       * then avoiding that train with help of the reservation
       * costs is not a bad thing, actually it would probably
       * be a good thing to do. */
      this->last_signal_type        = SIGTYPE_PBS;
    } else {
      this->num_signals_passed      = parent->num_signals_passed;
      this->flags_u.inherited_flags = parent->flags_u.inherited_flags;
      this->last_red_signal_type    = parent->last_red_signal_type;
      this->last_signal_type        = parent->last_signal_type;
    }
    this->flags_u.flags_s.choice_seen |= is_choice;
  }
 
  inline TileIndex GetLastTile() const
  {
    assert(this->segment != nullptr);
    return this->segment->last_tile;
  }
 
  inline Trackdir GetLastTrackdir() const
  {
    assert(this->segment != nullptr);
    return this->segment->last_td;
  }
 
  inline void SetLastTileTrackdir(TileIndex tile, Trackdir td)
  {
    assert(this->segment != nullptr);
    this->segment->last_tile = tile;
    this->segment->last_td = td;
  }
 
  template <class Tbase, class Tfunc, class Tpf>
  bool IterateTiles(const Train *v, Tpf &yapf, Tbase &obj, bool (Tfunc::*func)(TileIndex, Trackdir)) const
  {
    typename Tbase::TrackFollower ft(v, yapf.GetCompatibleRailTypes());
    TileIndex cur = this->base::GetTile();
    Trackdir  cur_td = this->base::GetTrackdir();
 
    while (cur != this->GetLastTile() || cur_td != this->GetLastTrackdir()) {
      if (!((obj.*func)(cur, cur_td))) return false;
 
      if (!ft.Follow(cur, cur_td)) break;
      cur = ft.new_tile;
      assert(KillFirstBit(ft.new_td_bits) == TRACKDIR_BIT_NONE);
      cur_td = FindFirstTrackdir(ft.new_td_bits);
    }
 
    return (obj.*func)(cur, cur_td);
  }
 
  void Dump(DumpTarget &dmp) const
  {
    this->base::Dump(dmp);
    dmp.WriteStructT("segment", this->segment);
    dmp.WriteValue("num_signals_passed", this->num_signals_passed);
    dmp.WriteValue("target_seen", this->flags_u.flags_s.target_seen ? "Yes" : "No");
    dmp.WriteValue("choice_seen", this->flags_u.flags_s.choice_seen ? "Yes" : "No");
    dmp.WriteValue("last_signal_was_red", this->flags_u.flags_s.last_signal_was_red ? "Yes" : "No");
    dmp.WriteEnumT("last_red_signal_type", this->last_red_signal_type);
  }
};
 
typedef NodeList<CYapfRailNode, 8, 10> CRailNodeList;
 
#endif /* YAPF_NODE_RAIL_HPP */