aboutsummaryrefslogtreecommitdiff
path: root/base/plugins.cpp
blob: b8cd097683787bc47c9bb2f7a28e1acd9c42db5c (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
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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; either version 2
 * of the License, or (at your option) any later version.

 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "base/plugins.h"

#include "common/func.h"
#include "common/debug.h"
#include "common/config-manager.h"

#ifdef DYNAMIC_MODULES
#include "common/fs.h"
#endif

// Plugin versioning

int pluginTypeVersions[PLUGIN_TYPE_MAX] = {
	PLUGIN_TYPE_ENGINE_VERSION,
	PLUGIN_TYPE_MUSIC_VERSION,
};


// Abstract plugins

PluginType Plugin::getType() const {
	return _type;
}

const char *Plugin::getName() const {
	return _pluginObject->getName();
}

class StaticPlugin : public Plugin {
public:
	StaticPlugin(PluginObject *pluginobject, PluginType type) {
		assert(pluginobject);
		assert(type < PLUGIN_TYPE_MAX);
		_pluginObject = pluginobject;
		_type = type;
	}

	~StaticPlugin() {
		delete _pluginObject;
	}

	virtual bool loadPlugin()		{ return true; }
	virtual void unloadPlugin()		{}
};

class StaticPluginProvider : public PluginProvider {
public:
	StaticPluginProvider() {
	}

	~StaticPluginProvider() {
	}

	virtual PluginList getPlugins() {
		PluginList pl;

		#define LINK_PLUGIN(ID) \
			extern PluginType g_##ID##_type; \
			extern PluginObject *g_##ID##_getObject(); \
			pl.push_back(new StaticPlugin(g_##ID##_getObject(), g_##ID##_type));

		// "Loader" for the static plugins.
		// Iterate over all registered (static) plugins and load them.

		// Engine plugins
		#include "engines/plugins_table.h"

		// Music plugins
		// TODO: Use defines to disable or enable each MIDI driver as a
		// static/dynamic plugin, like it's done for the engines
		LINK_PLUGIN(AUTO)
		LINK_PLUGIN(NULL)
		#if defined(WIN32) && !defined(_WIN32_WCE) && !defined(__SYMBIAN32__)
		LINK_PLUGIN(WINDOWS)
		#endif
		#if defined(USE_ALSA)
		LINK_PLUGIN(ALSA)
		#endif
		#if defined(USE_SEQ_MIDI)
		LINK_PLUGIN(SEQ)
		#endif
		#if defined(USE_SNDIO)
		LINK_PLUGIN(SNDIO)
		#endif
		#if defined(__MINT__)
		LINK_PLUGIN(STMIDI)
		#endif
		#if defined(IRIX)
		LINK_PLUGIN(DMEDIA)
		#endif
		#if defined(__amigaos4__)
		LINK_PLUGIN(CAMD)
		#endif
		#if defined(MACOSX)
		LINK_PLUGIN(COREAUDIO)
		LINK_PLUGIN(COREMIDI)
		#endif
		#ifdef USE_FLUIDSYNTH
		LINK_PLUGIN(FLUIDSYNTH)
		#endif
		#ifdef USE_MT32EMU
		LINK_PLUGIN(MT32)
		#endif
		#if defined(__ANDROID__)
		LINK_PLUGIN(EAS)
		#endif
		LINK_PLUGIN(ADLIB)
		LINK_PLUGIN(PCSPK)
		LINK_PLUGIN(PCJR)
		LINK_PLUGIN(CMS)
		#ifndef DISABLE_SID
		LINK_PLUGIN(C64)
		#endif
		LINK_PLUGIN(AMIGA)
		LINK_PLUGIN(APPLEIIGS)
		LINK_PLUGIN(TOWNS)
		LINK_PLUGIN(PC98)
		#if defined(USE_TIMIDITY)
		LINK_PLUGIN(TIMIDITY)
		#endif

		return pl;
	}
};

#ifdef DYNAMIC_MODULES

PluginList FilePluginProvider::getPlugins() {
	PluginList pl;

	// Prepare the list of directories to search
	Common::FSList pluginDirs;

	// Add the default directories
	pluginDirs.push_back(Common::FSNode("."));
	pluginDirs.push_back(Common::FSNode("plugins"));

	// Add the provider's custom directories
	addCustomDirectories(pluginDirs);

	// Add the user specified directory
	Common::String pluginsPath(ConfMan.get("pluginspath"));
	if (!pluginsPath.empty())
		pluginDirs.push_back(Common::FSNode(pluginsPath));

	Common::FSList::const_iterator dir;
	for (dir = pluginDirs.begin(); dir != pluginDirs.end(); ++dir) {
		// Load all plugins.
		// Scan for all plugins in this directory
		Common::FSList files;
		if (!dir->getChildren(files, Common::FSNode::kListFilesOnly)) {
			debug(1, "Couldn't open plugin directory '%s'", dir->getPath().c_str());
			continue;
		} else {
			debug(1, "Reading plugins from plugin directory '%s'", dir->getPath().c_str());
		}

		for (Common::FSList::const_iterator i = files.begin(); i != files.end(); ++i) {
			if (isPluginFilename(*i)) {
				pl.push_back(createPlugin(*i));
			}
		}
	}

	return pl;
}

bool FilePluginProvider::isPluginFilename(const Common::FSNode &node) const {
	Common::String filename = node.getName();

#ifdef PLUGIN_PREFIX
	// Check the plugin prefix
	if (!filename.hasPrefix(PLUGIN_PREFIX))
		return false;
#endif

#ifdef PLUGIN_SUFFIX
	// Check the plugin suffix
	if (!filename.hasSuffix(PLUGIN_SUFFIX))
		return false;
#endif

	return true;
}

void FilePluginProvider::addCustomDirectories(Common::FSList &dirs) const {
#ifdef PLUGIN_DIRECTORY
	dirs.push_back(Common::FSNode(PLUGIN_DIRECTORY));
#endif
}

#endif // DYNAMIC_MODULES

#pragma mark -

PluginManager *PluginManager::_instance = NULL;

PluginManager &PluginManager::instance() {
	if (_instance)
		return *_instance;

#if defined(UNCACHED_PLUGINS) && defined(DYNAMIC_MODULES)
		_instance = new PluginManagerUncached();
#else
		_instance = new PluginManager();
#endif
	return *_instance;
}

PluginManager::PluginManager() {
	// Always add the static plugin provider.
	addPluginProvider(new StaticPluginProvider());
}

PluginManager::~PluginManager() {
	// Explicitly unload all loaded plugins
	unloadAllPlugins();

	// Delete the plugin providers
	for (ProviderList::iterator pp = _providers.begin();
	                            pp != _providers.end();
	                            ++pp) {
		delete *pp;
	}
}

void PluginManager::addPluginProvider(PluginProvider *pp) {
	_providers.push_back(pp);
}

/**
 * This should only be called once by main()
 **/
void PluginManagerUncached::init() {
	unloadAllPlugins();
	_allEnginePlugins.clear();

	unloadPluginsExcept(PLUGIN_TYPE_ENGINE, NULL, false);	// empty the engine plugins

	for (ProviderList::iterator pp = _providers.begin();
	                            pp != _providers.end();
	                            ++pp) {
		PluginList pl((*pp)->getPlugins());

		for (PluginList::iterator p = pl.begin(); p != pl.end(); ++p) {
			// This is a 'hack' based on the assumption that we have no sound
			// file plugins. Currently this is the case. If it changes, we
			// should find a fast way of detecting whether a plugin is a
			// music or an engine plugin.
			if ((*pp)->isFilePluginProvider()) {
				_allEnginePlugins.push_back(*p);
			} else if ((*p)->loadPlugin()) { // and this is the proper method
				if ((*p)->getType() == PLUGIN_TYPE_ENGINE) {
					(*p)->unloadPlugin();
					_allEnginePlugins.push_back(*p);
				} else {	// add non-engine plugins to the 'in-memory' list
							// these won't ever get unloaded
					addToPluginsInMemList(*p);
				}
			}
 		}
 	}
}

/**
 * Try to load the plugin by searching in the ConfigManager for a matching
 * gameId under the domain 'plugin_files'.
 **/
bool PluginManagerUncached::loadPluginFromGameId(const Common::String &gameId) {
	Common::ConfigManager::Domain *domain = ConfMan.getDomain("plugin_files");

	if (domain) {
		if (domain->contains(gameId)) {
			Common::String filename = (*domain)[gameId];

		    if (loadPluginByFileName(filename)) {
				return true;
			}
		}
	}
	return false;
}

/**
 * Load a plugin with a filename taken from ConfigManager.
 **/
bool PluginManagerUncached::loadPluginByFileName(const Common::String &filename) {
	if (filename.empty())
		return false;

	unloadPluginsExcept(PLUGIN_TYPE_ENGINE, NULL, false);

	PluginList::iterator i;
	for (i = _allEnginePlugins.begin(); i != _allEnginePlugins.end(); ++i) {
		if (Common::String((*i)->getFileName()) == filename && (*i)->loadPlugin()) {
			addToPluginsInMemList(*i);
			_currentPlugin = i;
			return true;
		}
	}
	return false;
}

/**
 * Update the config manager with a plugin file name that we found can handle
 * the game.
 **/
void PluginManagerUncached::updateConfigWithFileName(const Common::String &gameId) {
	// Check if we have a filename for the current plugin
	if ((*_currentPlugin)->getFileName()) {
		if (!ConfMan.hasMiscDomain("plugin_files"))
			ConfMan.addMiscDomain("plugin_files");

		Common::ConfigManager::Domain *domain = ConfMan.getDomain("plugin_files");
		assert(domain);
		(*domain)[gameId] = (*_currentPlugin)->getFileName();

		ConfMan.flushToDisk();
	}
}

void PluginManagerUncached::loadFirstPlugin() {
	unloadPluginsExcept(PLUGIN_TYPE_ENGINE, NULL, false);

	// let's try to find one we can load
	for (_currentPlugin = _allEnginePlugins.begin(); _currentPlugin != _allEnginePlugins.end(); ++_currentPlugin) {
		if ((*_currentPlugin)->loadPlugin()) {
			addToPluginsInMemList(*_currentPlugin);
			break;
		}
	}
}

bool PluginManagerUncached::loadNextPlugin() {
	unloadPluginsExcept(PLUGIN_TYPE_ENGINE, NULL, false);

	for (++_currentPlugin; _currentPlugin != _allEnginePlugins.end(); ++_currentPlugin) {
		if ((*_currentPlugin)->loadPlugin()) {
			addToPluginsInMemList(*_currentPlugin);
			return true;
		}
	}
	return false;	// no more in list
}

/**
 * Used by only the cached plugin manager. The uncached manager can only have
 * one plugin in memory at a time.
 **/
void PluginManager::loadAllPlugins() {
	for (ProviderList::iterator pp = _providers.begin();
	                            pp != _providers.end();
	                            ++pp) {
		PluginList pl((*pp)->getPlugins());
		Common::for_each(pl.begin(), pl.end(), Common::bind1st(Common::mem_fun(&PluginManager::tryLoadPlugin), this));
	}
}

void PluginManager::unloadAllPlugins() {
	for (int i = 0; i < PLUGIN_TYPE_MAX; i++)
		unloadPluginsExcept((PluginType)i, NULL);
}

void PluginManager::unloadPluginsExcept(PluginType type, const Plugin *plugin, bool deletePlugin /*=true*/) {
	Plugin *found = NULL;
	for (PluginList::iterator p = _pluginsInMem[type].begin(); p != _pluginsInMem[type].end(); ++p) {
		if (*p == plugin) {
			found = *p;
		} else {
			(*p)->unloadPlugin();
			if (deletePlugin)
				delete *p;
		}
	}
	_pluginsInMem[type].clear();
	if (found != NULL) {
		_pluginsInMem[type].push_back(found);
	}
}

/*
 * Used only by the cached plugin manager since it deletes the plugin.
 */
bool PluginManager::tryLoadPlugin(Plugin *plugin) {
	assert(plugin);
	// Try to load the plugin
	if (plugin->loadPlugin()) {
		addToPluginsInMemList(plugin);
		return true;
	} else {
		// Failed to load the plugin
		delete plugin;
		return false;
	}
}

/**
 * Add to the list of plugins loaded in memory.
 */
void PluginManager::addToPluginsInMemList(Plugin *plugin) {
	bool found = false;
	// The plugin is valid, see if it provides the same module as an
	// already loaded one and should replace it.

	PluginList::iterator pl = _pluginsInMem[plugin->getType()].begin();
	while (!found && pl != _pluginsInMem[plugin->getType()].end()) {
		if (!strcmp(plugin->getName(), (*pl)->getName())) {
			// Found a duplicated module. Replace the old one.
			found = true;
			delete *pl;
			*pl = plugin;
			debug(1, "Replaced the duplicated plugin: '%s'", plugin->getName());
		}
		pl++;
	}

	if (!found) {
		// If it provides a new module, just add it to the list of known plugins in memory.
		_pluginsInMem[plugin->getType()].push_back(plugin);
	}
}

// Engine plugins

#include "engines/metaengine.h"

namespace Common {
DECLARE_SINGLETON(EngineManager);
}

/**
 * This function works for both cached and uncached PluginManagers.
 * For the cached version, most of the logic here will short circuit.
 *
 * For the uncached version, we first try to find the plugin using the gameId
 * and only if we can't find it there, we loop through the plugins.
 **/
GameDescriptor EngineManager::findGame(const Common::String &gameName, const EnginePlugin **plugin) const {
	GameDescriptor result;

	// First look for the game using the plugins in memory. This is critical
	// for calls coming from inside games
	result = findGameInLoadedPlugins(gameName, plugin);
	if (!result.gameid().empty()) {
		return result;
	}

	// Now look for the game using the gameId. This is much faster than scanning plugin
	// by plugin
	if (PluginMan.loadPluginFromGameId(gameName))  {
		result = findGameInLoadedPlugins(gameName, plugin);
		if (!result.gameid().empty()) {
			return result;
		}
	}

	// We failed to find it using the gameid. Scan the list of plugins
	PluginMan.loadFirstPlugin();
	do {
		result = findGameInLoadedPlugins(gameName, plugin);
		if (!result.gameid().empty()) {
			// Update with new plugin file name
			PluginMan.updateConfigWithFileName(gameName);
			break;
		}
	} while (PluginMan.loadNextPlugin());

	return result;
}

/**
 * Find the game within the plugins loaded in memory
 **/
GameDescriptor EngineManager::findGameInLoadedPlugins(const Common::String &gameName, const EnginePlugin **plugin) const {
	// Find the GameDescriptor for this target
	const EnginePlugin::List &plugins = getPlugins();
	GameDescriptor result;

	if (plugin)
		*plugin = 0;

	EnginePlugin::List::const_iterator iter;

	for (iter = plugins.begin(); iter != plugins.end(); ++iter) {
		result = (**iter)->findGame(gameName.c_str());
		if (!result.gameid().empty()) {
			if (plugin)
				*plugin = *iter;
			return result;
		}
	}
	return result;
}

GameList EngineManager::detectGames(const Common::FSList &fslist) const {
	GameList candidates;
	EnginePlugin::List plugins;
	EnginePlugin::List::const_iterator iter;
	PluginManager::instance().loadFirstPlugin();
	do {
		plugins = getPlugins();
		// Iterate over all known games and for each check if it might be
		// the game in the presented directory.
		for (iter = plugins.begin(); iter != plugins.end(); ++iter) {
			candidates.push_back((**iter)->detectGames(fslist));
		}
	} while (PluginManager::instance().loadNextPlugin());
	return candidates;
}

const EnginePlugin::List &EngineManager::getPlugins() const {
	return (const EnginePlugin::List &)PluginManager::instance().getPlugins(PLUGIN_TYPE_ENGINE);
}


// Music plugins

#include "audio/musicplugin.h"

namespace Common {
DECLARE_SINGLETON(MusicManager);
}

const MusicPlugin::List &MusicManager::getPlugins() const {
	return (const MusicPlugin::List &)PluginManager::instance().getPlugins(PLUGIN_TYPE_MUSIC);
}