summaryrefslogtreecommitdiff
path: root/src/pathfinder/yapf/yapf_node_rail.hpp
blob: 9d33ab7a7a2e6558117516fed6a641173f3984de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
/*
 * 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 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(nullptr)
	{}

	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.WriteValue("m_cost", 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 = nullptr;
		if (parent == nullptr) {
			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 != nullptr);
		return m_segment->m_last_tile;
	}

	inline Trackdir GetLastTrackdir() const
	{
		assert(m_segment != nullptr);
		return m_segment->m_last_td;
	}

	inline void SetLastTileTrackdir(TileIndex tile, Trackdir td)
	{
		assert(m_segment != nullptr);
		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.WriteValue("m_num_signals_passed", m_num_signals_passed);
		dmp.WriteValue("m_targed_seen", flags_u.flags_s.m_targed_seen ? "Yes" : "No");
		dmp.WriteValue("m_choice_seen", flags_u.flags_s.m_choice_seen ? "Yes" : "No");
		dmp.WriteValue("m_last_signal_was_red", 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 */