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/* $Id$ */
/*
* 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/>.
*/
/** @file yapf_node.hpp Node in the pathfinder's graph. */
#ifndef YAPF_NODE_HPP
#define YAPF_NODE_HPP
/** Yapf Node Key that evaluates hash from (and compares) tile & exit dir. */
struct CYapfNodeKeyExitDir {
TileIndex m_tile;
Trackdir m_td;
DiagDirection m_exitdir;
inline void Set(TileIndex tile, Trackdir td)
{
m_tile = tile;
m_td = td;
m_exitdir = (m_td == INVALID_TRACKDIR) ? INVALID_DIAGDIR : TrackdirToExitdir(m_td);
}
inline int CalcHash() const {return m_exitdir | (m_tile << 2);}
inline bool operator == (const CYapfNodeKeyExitDir& other) const {return (m_tile == other.m_tile) && (m_exitdir == other.m_exitdir);}
void Dump(DumpTarget &dmp) const
{
dmp.WriteTile("m_tile", m_tile);
dmp.WriteEnumT("m_td", m_td);
dmp.WriteEnumT("m_exitdir", m_exitdir);
}
};
struct CYapfNodeKeyTrackDir : public CYapfNodeKeyExitDir
{
inline int CalcHash() const {return m_td | (m_tile << 4);}
inline bool operator == (const CYapfNodeKeyTrackDir& other) const {return (m_tile == other.m_tile) && (m_td == other.m_td);}
};
/** Yapf Node base */
template <class Tkey_, class Tnode>
struct CYapfNodeT {
typedef Tkey_ Key;
typedef Tnode Node;
Tkey_ m_key;
Node *m_hash_next;
Node *m_parent;
int m_cost;
int m_estimate;
inline void Set(Node *parent, TileIndex tile, Trackdir td, bool is_choice)
{
m_key.Set(tile, td);
m_hash_next = NULL;
m_parent = parent;
m_cost = 0;
m_estimate = 0;
}
inline Node *GetHashNext() {return m_hash_next;}
inline void SetHashNext(Node *pNext) {m_hash_next = pNext;}
inline TileIndex GetTile() const {return m_key.m_tile;}
inline Trackdir GetTrackdir() const {return m_key.m_td;}
inline const Tkey_& GetKey() const {return m_key;}
inline int GetCost() const {return m_cost;}
inline int GetCostEstimate() const {return m_estimate;}
inline bool operator < (const Node& other) const {return m_estimate < other.m_estimate;}
void Dump(DumpTarget &dmp) const
{
dmp.WriteStructT("m_key", &m_key);
dmp.WriteStructT("m_parent", m_parent);
dmp.WriteLine("m_cost = %d", m_cost);
dmp.WriteLine("m_estimate = %d", m_estimate);
}
};
#endif /* YAPF_NODE_HPP */
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