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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_rail.hpp Node tailored for rail pathfinding. */
#ifndef YAPF_NODE_RAIL_HPP
#define YAPF_NODE_RAIL_HPP
/** key for cached segment cost for rail YAPF */
struct CYapfRailSegmentKey
{
uint32 m_value;
inline CYapfRailSegmentKey(const CYapfRailSegmentKey& src) : m_value(src.m_value) {}
inline CYapfRailSegmentKey(const CYapfNodeKeyTrackDir& node_key)
{
Set(node_key);
}
inline void Set(const CYapfRailSegmentKey& src)
{
m_value = src.m_value;
}
inline void Set(const CYapfNodeKeyTrackDir& node_key)
{
m_value = (((int)node_key.m_tile) << 4) | node_key.m_td;
}
inline int32 CalcHash() const
{
return m_value;
}
inline TileIndex GetTile() const
{
return (TileIndex)(m_value >> 4);
}
inline Trackdir GetTrackdir() const
{
return (Trackdir)(m_value & 0x0F);
}
inline bool operator == (const CYapfRailSegmentKey& other) const
{
return m_value == other.m_value;
}
void Dump(DumpTarget &dmp) const
{
dmp.WriteTile("tile", GetTile());
dmp.WriteEnumT("td", GetTrackdir());
}
};
/** cached segment cost for rail YAPF */
struct CYapfRailSegment
{
typedef CYapfRailSegmentKey Key;
CYapfRailSegmentKey m_key;
TileIndex m_last_tile;
Trackdir m_last_td;
int m_cost;
TileIndex m_last_signal_tile;
Trackdir m_last_signal_td;
EndSegmentReasonBits m_end_segment_reason;
CYapfRailSegment *m_hash_next;
inline CYapfRailSegment(const CYapfRailSegmentKey& key)
: m_key(key)
, m_last_tile(INVALID_TILE)
, m_last_td(INVALID_TRACKDIR)
, m_cost(-1)
, m_last_signal_tile(INVALID_TILE)
, m_last_signal_td(INVALID_TRACKDIR)
, m_end_segment_reason(ESRB_NONE)
, m_hash_next(NULL)
{}
inline const Key& GetKey() const
{
return m_key;
}
inline TileIndex GetTile() const
{
return m_key.GetTile();
}
inline CYapfRailSegment *GetHashNext()
{
return m_hash_next;
}
inline void SetHashNext(CYapfRailSegment *next)
{
m_hash_next = next;
}
void Dump(DumpTarget &dmp) const
{
dmp.WriteStructT("m_key", &m_key);
dmp.WriteTile("m_last_tile", m_last_tile);
dmp.WriteEnumT("m_last_td", m_last_td);
dmp.WriteLine("m_cost = %d", m_cost);
dmp.WriteTile("m_last_signal_tile", m_last_signal_tile);
dmp.WriteEnumT("m_last_signal_td", m_last_signal_td);
dmp.WriteEnumT("m_end_segment_reason", m_end_segment_reason);
}
};
/** Yapf Node for rail YAPF */
template <class Tkey_>
struct CYapfRailNodeT
: CYapfNodeT<Tkey_, CYapfRailNodeT<Tkey_> >
{
typedef CYapfNodeT<Tkey_, CYapfRailNodeT<Tkey_> > base;
typedef CYapfRailSegment CachedData;
CYapfRailSegment *m_segment;
uint16 m_num_signals_passed;
union {
uint32 m_inherited_flags;
struct {
bool m_targed_seen : 1;
bool m_choice_seen : 1;
bool m_last_signal_was_red : 1;
} flags_s;
} flags_u;
SignalType m_last_red_signal_type;
SignalType m_last_signal_type;
inline void Set(CYapfRailNodeT *parent, TileIndex tile, Trackdir td, bool is_choice)
{
base::Set(parent, tile, td, is_choice);
m_segment = NULL;
if (parent == NULL) {
m_num_signals_passed = 0;
flags_u.m_inherited_flags = 0;
m_last_red_signal_type = SIGTYPE_NORMAL;
/* 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. */
m_last_signal_type = SIGTYPE_PBS;
} else {
m_num_signals_passed = parent->m_num_signals_passed;
flags_u.m_inherited_flags = parent->flags_u.m_inherited_flags;
m_last_red_signal_type = parent->m_last_red_signal_type;
m_last_signal_type = parent->m_last_signal_type;
}
flags_u.flags_s.m_choice_seen |= is_choice;
}
inline TileIndex GetLastTile() const
{
assert(m_segment != NULL);
return m_segment->m_last_tile;
}
inline Trackdir GetLastTrackdir() const
{
assert(m_segment != NULL);
return m_segment->m_last_td;
}
inline void SetLastTileTrackdir(TileIndex tile, Trackdir td)
{
assert(m_segment != NULL);
m_segment->m_last_tile = tile;
m_segment->m_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 = base::GetTile();
Trackdir cur_td = base::GetTrackdir();
while (cur != GetLastTile() || cur_td != GetLastTrackdir()) {
if (!((obj.*func)(cur, cur_td))) return false;
if (!ft.Follow(cur, cur_td)) break;
cur = ft.m_new_tile;
assert(KillFirstBit(ft.m_new_td_bits) == TRACKDIR_BIT_NONE);
cur_td = FindFirstTrackdir(ft.m_new_td_bits);
}
return (obj.*func)(cur, cur_td);
}
void Dump(DumpTarget &dmp) const
{
base::Dump(dmp);
dmp.WriteStructT("m_segment", m_segment);
dmp.WriteLine("m_num_signals_passed = %d", m_num_signals_passed);
dmp.WriteLine("m_targed_seen = %s", flags_u.flags_s.m_targed_seen ? "Yes" : "No");
dmp.WriteLine("m_choice_seen = %s", flags_u.flags_s.m_choice_seen ? "Yes" : "No");
dmp.WriteLine("m_last_signal_was_red = %s", flags_u.flags_s.m_last_signal_was_red ? "Yes" : "No");
dmp.WriteEnumT("m_last_red_signal_type", m_last_red_signal_type);
}
};
/* now define two major node types (that differ by key type) */
typedef CYapfRailNodeT<CYapfNodeKeyExitDir> CYapfRailNodeExitDir;
typedef CYapfRailNodeT<CYapfNodeKeyTrackDir> CYapfRailNodeTrackDir;
/* Default NodeList types */
typedef CNodeList_HashTableT<CYapfRailNodeExitDir , 8, 10> CRailNodeListExitDir;
typedef CNodeList_HashTableT<CYapfRailNodeTrackDir, 8, 10> CRailNodeListTrackDir;
#endif /* YAPF_NODE_RAIL_HPP */
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