summaryrefslogtreecommitdiff
path: root/src/saveload/linkgraph_sl.cpp
blob: 7000946daf4a5a1e6ae29074b4408bf13a2647dd (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
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
/*
 * 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 linkgraph_sl.cpp Code handling saving and loading of link graphs */

#include "../stdafx.h"
#include "../linkgraph/linkgraph.h"
#include "../linkgraph/linkgraphjob.h"
#include "../linkgraph/linkgraphschedule.h"
#include "../network/network.h"
#include "../settings_internal.h"
#include "saveload.h"

#include "../safeguards.h"

typedef LinkGraph::BaseNode Node;
typedef LinkGraph::BaseEdge Edge;

static uint16 _num_nodes;
static LinkGraph *_linkgraph; ///< Contains the current linkgraph being saved/loaded.
static NodeID _linkgraph_from; ///< Contains the current "from" node being saved/loaded.

class SlLinkgraphEdge : public DefaultSaveLoadHandler<SlLinkgraphEdge, Node> {
public:
	inline static const SaveLoad description[] = {
		SLE_CONDNULL(4, SL_MIN_VERSION, SLV_191), // distance
		    SLE_VAR(Edge, capacity,                 SLE_UINT32),
		    SLE_VAR(Edge, usage,                    SLE_UINT32),
		    SLE_VAR(Edge, last_unrestricted_update, SLE_INT32),
		SLE_CONDVAR(Edge, last_restricted_update,   SLE_INT32, SLV_187, SL_MAX_VERSION),
		    SLE_VAR(Edge, next_edge,                SLE_UINT16),
	};

	void Save(Node *bn) const override
	{
		uint16 size = 0;
		for (NodeID to = _linkgraph_from; to != INVALID_NODE; to = _linkgraph->edges[_linkgraph_from][to].next_edge) {
			size++;
		}

		SlSetStructListLength(size);
		for (NodeID to = _linkgraph_from; to != INVALID_NODE; to = _linkgraph->edges[_linkgraph_from][to].next_edge) {
			SlObject(&_linkgraph->edges[_linkgraph_from][to], this->GetDescription());
		}
	}

	void Load(Node *bn) const override
	{
		uint16 max_size = _linkgraph->Size();

		if (IsSavegameVersionBefore(SLV_191)) {
			/* We used to save the full matrix ... */
			for (NodeID to = 0; to < max_size; ++to) {
				SlObject(&_linkgraph->edges[_linkgraph_from][to], this->GetDescription());
			}
			return;
		}

		size_t used_size = IsSavegameVersionBefore(SLV_SAVELOAD_LIST_LENGTH) ? max_size : SlGetStructListLength(UINT16_MAX);

		/* ... but as that wasted a lot of space we save a sparse matrix now. */
		for (NodeID to = _linkgraph_from; to != INVALID_NODE; to = _linkgraph->edges[_linkgraph_from][to].next_edge) {
			if (used_size == 0) SlErrorCorrupt("Link graph structure overflow");
			used_size--;

			if (to >= max_size) SlErrorCorrupt("Link graph structure overflow");
			SlObject(&_linkgraph->edges[_linkgraph_from][to], this->GetDescription());
		}

		if (!IsSavegameVersionBefore(SLV_SAVELOAD_LIST_LENGTH) && used_size > 0) SlErrorCorrupt("Corrupted link graph");
	}
};

class SlLinkgraphNode : public DefaultSaveLoadHandler<SlLinkgraphNode, LinkGraph> {
public:
	inline static const SaveLoad description[] = {
		SLE_CONDVAR(Node, xy,          SLE_UINT32, SLV_191, SL_MAX_VERSION),
		    SLE_VAR(Node, supply,      SLE_UINT32),
		    SLE_VAR(Node, demand,      SLE_UINT32),
		    SLE_VAR(Node, station,     SLE_UINT16),
		    SLE_VAR(Node, last_update, SLE_INT32),
		SLEG_STRUCTLIST(SlLinkgraphEdge),
	};

	void Save(LinkGraph *lg) const override
	{
		_linkgraph = lg;

		SlSetStructListLength(lg->Size());
		for (NodeID from = 0; from < lg->Size(); ++from) {
			_linkgraph_from = from;
			SlObject(&lg->nodes[from], this->GetDescription());
		}
	}

	void Load(LinkGraph *lg) const override
	{
		_linkgraph = lg;

		uint16 length = IsSavegameVersionBefore(SLV_SAVELOAD_LIST_LENGTH) ? _num_nodes : (uint16)SlGetStructListLength(UINT16_MAX);
		lg->Init(length);
		for (NodeID from = 0; from < length; ++from) {
			_linkgraph_from = from;
			SlObject(&lg->nodes[from], this->GetDescription());
		}
	}
};

/**
 * Get a SaveLoad array for a link graph.
 * @return SaveLoad array for link graph.
 */
SaveLoadTable GetLinkGraphDesc()
{
	static const SaveLoad link_graph_desc[] = {
		 SLE_VAR(LinkGraph, last_compression, SLE_INT32),
		SLEG_CONDVAR(_num_nodes,              SLE_UINT16, SL_MIN_VERSION, SLV_SAVELOAD_LIST_LENGTH),
		 SLE_VAR(LinkGraph, cargo,            SLE_UINT8),
		SLEG_STRUCTLIST(SlLinkgraphNode),
	};
	return link_graph_desc;
}

/**
 * Proxy to reuse LinkGraph to save/load a LinkGraphJob.
 * One of the members of a LinkGraphJob is a LinkGraph, but SLEG_STRUCT()
 * doesn't allow us to select a member. So instead, we add a bit of glue to
 * accept a LinkGraphJob, get the LinkGraph, and use that to call the
 * save/load routines for a regular LinkGraph.
 */
class SlLinkgraphJobProxy : public DefaultSaveLoadHandler<SlLinkgraphJobProxy, LinkGraphJob> {
public:
	inline static const SaveLoad description[] = {{}}; // Needed to keep DefaultSaveLoadHandler happy.
	SaveLoadTable GetDescription() const override { return GetLinkGraphDesc(); }

	void Save(LinkGraphJob *lgj) const override
	{
		SlObject(const_cast<LinkGraph *>(&lgj->Graph()), GetLinkGraphDesc());
	}

	void Load(LinkGraphJob *lgj) const override
	{
		SlObject(const_cast<LinkGraph *>(&lgj->Graph()), GetLinkGraphDesc());
	}
};

/**
 * Get a SaveLoad array for a link graph job. The settings struct is derived from
 * the global settings saveload array. The exact entries are calculated when the function
 * is called the first time.
 * It's necessary to keep a copy of the settings for each link graph job so that you can
 * change the settings while in-game and still not mess with current link graph runs.
 * Of course the settings have to be saved and loaded, too, to avoid desyncs.
 * @return Array of SaveLoad structs.
 */
SaveLoadTable GetLinkGraphJobDesc()
{
	static std::vector<SaveLoad> saveloads;
	static const char *prefix = "linkgraph.";

	static const SaveLoad job_desc[] = {
		SLE_VAR(LinkGraphJob, join_date,        SLE_INT32),
		SLE_VAR(LinkGraphJob, link_graph.index, SLE_UINT16),
		SLEG_STRUCT(SlLinkgraphJobProxy),
	};

	/* The member offset arithmetic below is only valid if the types in question
	 * are standard layout types. Otherwise, it would be undefined behaviour. */
	static_assert(std::is_standard_layout<LinkGraphSettings>::value, "LinkGraphSettings needs to be a standard layout type");

	/* We store the offset of each member of the #LinkGraphSettings in the
	 * extra data of the saveload struct. Use it together with the address
	 * of the settings struct inside the job to find the final memory address. */
	static SaveLoadAddrProc * const proc = [](void *b, size_t extra) -> void * { return const_cast<void *>(static_cast<const void *>(reinterpret_cast<const char *>(std::addressof(static_cast<LinkGraphJob *>(b)->settings)) + extra)); };

	/* Build the SaveLoad array on first call and don't touch it later on */
	if (saveloads.size() == 0) {
		GetSettingSaveLoadByPrefix(prefix, saveloads);

		for (auto &sl : saveloads) {
			sl.address_proc = proc;
		}

		for (auto &sld : job_desc) {
			saveloads.push_back(sld);
		}
	}

	return saveloads;
}

/**
 * Get a SaveLoad array for the link graph schedule.
 * @return SaveLoad array for the link graph schedule.
 */
SaveLoadTable GetLinkGraphScheduleDesc()
{
	static const SaveLoad schedule_desc[] = {
		SLE_REFLIST(LinkGraphSchedule, schedule, REF_LINK_GRAPH),
		SLE_REFLIST(LinkGraphSchedule, running,  REF_LINK_GRAPH_JOB),
	};
	return schedule_desc;
}

/**
 * Spawn the threads for running link graph calculations.
 * Has to be done after loading as the cargo classes might have changed.
 */
void AfterLoadLinkGraphs()
{
	if (IsSavegameVersionBefore(SLV_191)) {
		for (LinkGraph *lg : LinkGraph::Iterate()) {
			for (NodeID node_id = 0; node_id < lg->Size(); ++node_id) {
				const Station *st = Station::GetIfValid((*lg)[node_id].Station());
				if (st != nullptr) (*lg)[node_id].UpdateLocation(st->xy);
			}
		}

		for (LinkGraphJob *lgj : LinkGraphJob::Iterate()) {
			LinkGraph *lg = &(const_cast<LinkGraph &>(lgj->Graph()));
			for (NodeID node_id = 0; node_id < lg->Size(); ++node_id) {
				const Station *st = Station::GetIfValid((*lg)[node_id].Station());
				if (st != nullptr) (*lg)[node_id].UpdateLocation(st->xy);
			}
		}
	}

	LinkGraphSchedule::instance.SpawnAll();

	if (!_networking || _network_server) {
		AfterLoad_LinkGraphPauseControl();
	}
}

/**
 * Save all link graphs.
 */
static void Save_LGRP()
{
	for (LinkGraph *lg : LinkGraph::Iterate()) {
		SlSetArrayIndex(lg->index);
		SlObject(lg, GetLinkGraphDesc());
	}
}

/**
 * Load all link graphs.
 */
static void Load_LGRP()
{
	int index;
	while ((index = SlIterateArray()) != -1) {
		LinkGraph *lg = new (index) LinkGraph();
		SlObject(lg, GetLinkGraphDesc());
	}
}

/**
 * Save all link graph jobs.
 */
static void Save_LGRJ()
{
	for (LinkGraphJob *lgj : LinkGraphJob::Iterate()) {
		SlSetArrayIndex(lgj->index);
		SlObject(lgj, GetLinkGraphJobDesc());
	}
}

/**
 * Load all link graph jobs.
 */
static void Load_LGRJ()
{
	int index;
	while ((index = SlIterateArray()) != -1) {
		LinkGraphJob *lgj = new (index) LinkGraphJob();
		SlObject(lgj, GetLinkGraphJobDesc());
	}
}

/**
 * Save the link graph schedule.
 */
static void Save_LGRS()
{
	SlSetArrayIndex(0);
	SlObject(&LinkGraphSchedule::instance, GetLinkGraphScheduleDesc());
}

/**
 * Load the link graph schedule.
 */
static void Load_LGRS()
{
	if (!IsSavegameVersionBefore(SLV_RIFF_TO_ARRAY) && SlIterateArray() == -1) return;
	SlObject(&LinkGraphSchedule::instance, GetLinkGraphScheduleDesc());
	if (!IsSavegameVersionBefore(SLV_RIFF_TO_ARRAY) && SlIterateArray() != -1) SlErrorCorrupt("Too many LGRS entries");
}

/**
 * Substitute pointers in link graph schedule.
 */
static void Ptrs_LGRS()
{
	SlObject(&LinkGraphSchedule::instance, GetLinkGraphScheduleDesc());
}

static const ChunkHandler linkgraph_chunk_handlers[] = {
	{ 'LGRP', Save_LGRP, Load_LGRP, nullptr,   nullptr, CH_ARRAY },
	{ 'LGRJ', Save_LGRJ, Load_LGRJ, nullptr,   nullptr, CH_ARRAY },
	{ 'LGRS', Save_LGRS, Load_LGRS, Ptrs_LGRS, nullptr, CH_ARRAY },
};

extern const ChunkHandlerTable _linkgraph_chunk_handlers(linkgraph_chunk_handlers);