yapf_common.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 <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#ifndef YAPF_COMMON_HPP
#define YAPF_COMMON_HPP
 
#include "../../core/bitmath_func.hpp"
#include "../../tile_type.h"
#include "../../track_type.h"

template <class Types>
class CYapfOriginTileT {
public:
  typedef typename Types::Tpf Tpf; 
  typedef typename Types::NodeList::Item Node; 
  typedef typename Node::Key Key; 
 
protected:
  inline Tpf &Yapf()
  {
    return *static_cast<Tpf *>(this);
  }
 
public:
  void SetOrigin(TileIndex tile, TrackdirBits trackdirs)
  {
    bool is_choice = trackdirs.Count() > 1;
    for (Trackdir td : trackdirs) {
      Node &node = Yapf().CreateNewNode();
      node.Set(nullptr, tile, td, is_choice);
      Yapf().AddStartupNode(node);
    }
  }
};

template <class Types>
class CYapfOriginTileTwoWayT {
public:
  typedef typename Types::Tpf Tpf; 
  typedef typename Types::NodeList::Item Node; 
  typedef typename Node::Key Key; 
 
protected:
  inline Tpf &Yapf()
  {
    return *static_cast<Tpf *>(this);
  }
 
public:
  void SetOrigin(TileIndex forward_tile, Trackdir forward_td, TileIndex reverse_tile = INVALID_TILE,
      Trackdir reverse_td = Trackdir::Invalid, int reverse_penalty = 0)
  {
    if (forward_tile != INVALID_TILE && forward_td != Trackdir::Invalid) {
      Node &node = Yapf().CreateNewNode();
      node.Set(nullptr, forward_tile, forward_td, false);
      Yapf().AddStartupNode(node);
    }
    if (reverse_tile != INVALID_TILE && reverse_td != Trackdir::Invalid) {
      Node &node = Yapf().CreateNewNode();
      node.Set(nullptr, reverse_tile, reverse_td, false);
      node.cost = reverse_penalty;
      Yapf().AddStartupNode(node);
    }
  }
};

template <class Ttypes>
class CYapfT
  : public Ttypes::PfBase         
  , public Ttypes::PfCost         
  , public Ttypes::PfCache        
  , public Ttypes::PfOrigin       
  , public Ttypes::PfDestination  
  , public Ttypes::PfFollow       
{
};

inline int OctileDistanceCost(TileIndex start_tile, Trackdir start_td, TileIndex destination_tile)
{
  static constexpr int dg_dir_to_x_offs[] = {-1, 0, 1, 0};
  static constexpr int dg_dir_to_y_offs[] = {0, 1, 0, -1};
 
  const DiagDirection exitdir = TrackdirToExitdir(start_td);
 
  const int x1 = 2 * TileX(start_tile) + dg_dir_to_x_offs[static_cast<int>(exitdir)];
  const int y1 = 2 * TileY(start_tile) + dg_dir_to_y_offs[static_cast<int>(exitdir)];
  const int x2 = 2 * TileX(destination_tile);
  const int y2 = 2 * TileY(destination_tile);
  const int dx = abs(x1 - x2);
  const int dy = abs(y1 - y2);
  const int dmin = std::min(dx, dy);
  const int dxy = abs(dx - dy);
 
  return dmin * YAPF_TILE_CORNER_LENGTH + (dxy - 1) * (YAPF_TILE_LENGTH / 2);
}
 
#endif /* YAPF_COMMON_HPP */