aboutsummaryrefslogtreecommitdiff
path: root/base/plugins.cpp
blob: 7ccd99ce34aaadab321c60e3b3783ddccd278b78 (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
/* 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.
 *
 * $URL$
 * $Id$
 *
 */

#include "base/plugins.h"
#include "common/util.h"


#ifndef DYNAMIC_MODULES
class StaticPlugin : public Plugin {
	PluginRegistrator *_plugin;
public:
	StaticPlugin(PluginRegistrator *plugin)
		: _plugin(plugin) {
		assert(_plugin);
	}

	~StaticPlugin() {
		delete _plugin;
	}

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

	const char *getName() const { return _plugin->_name; }
	const char *getCopyright() const { return _plugin->_copyright; }

	PluginError createInstance(OSystem *syst, Engine **engine) const {
		assert(_plugin->_ef);
		return (*_plugin->_ef)(syst, engine);
	}

	GameList getSupportedGames() const { return _plugin->_games; }

	GameDescriptor findGame(const char *gameid) const {
		assert(_plugin->_qf);
		return (*_plugin->_qf)(gameid);
	}

	GameList detectGames(const FSList &fslist) const {
		assert(_plugin->_df);
		return (*_plugin->_df)(fslist);
	}
};

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

	~StaticPluginProvider() {
	}

	virtual PluginList getPlugins() {
		PluginList pl;

		#define LINK_PLUGIN(ID) \
			extern PluginRegistrator *g_##ID##_PluginReg; \
			extern void g_##ID##_PluginReg_alloc(); \
			g_##ID##_PluginReg_alloc(); \
			plugin = g_##ID##_PluginReg; \
			pl.push_back(new StaticPlugin(plugin));

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

		#ifndef DISABLE_SCUMM
		LINK_PLUGIN(SCUMM)
		#endif
		#ifndef DISABLE_AGI
		LINK_PLUGIN(AGI)
		#endif
		#ifndef DISABLE_AGOS
		LINK_PLUGIN(AGOS)
		#endif
		#ifndef DISABLE_CINE
		LINK_PLUGIN(CINE)
		#endif
		#ifndef DISABLE_CRUISE
		LINK_PLUGIN(CRUISE)
		#endif
		#ifndef DISABLE_DRASCULA
		LINK_PLUGIN(DRASCULA)
		#endif
		#ifndef DISABLE_GOB
		LINK_PLUGIN(GOB)
		#endif
		#ifndef DISABLE_IGOR
		LINK_PLUGIN(IGOR)
		#endif
		#ifndef DISABLE_KYRA
		LINK_PLUGIN(KYRA)
		#endif
		#ifndef DISABLE_LURE
		LINK_PLUGIN(LURE)
		#endif
		#ifndef DISABLE_PARALLACTION
		LINK_PLUGIN(PARALLACTION)
		#endif
		#ifndef DISABLE_QUEEN
		LINK_PLUGIN(QUEEN)
		#endif
		#ifndef DISABLE_SAGA
		LINK_PLUGIN(SAGA)
		#endif
		#ifndef DISABLE_SKY
		LINK_PLUGIN(SKY)
		#endif
		#ifndef DISABLE_SWORD1
		LINK_PLUGIN(SWORD1)
		#endif
		#ifndef DISABLE_SWORD2
		LINK_PLUGIN(SWORD2)
		#endif
		#ifndef DISABLE_TOUCHE
		LINK_PLUGIN(TOUCHE)
		#endif

		return pl;
	}
};


#endif

#pragma mark -

DECLARE_SINGLETON(PluginManager);

PluginManager::PluginManager() {
#ifndef DYNAMIC_MODULES
	// Add the static plugin provider if we do not build with dynamic
	// plugins.
	addPluginProvider(new StaticPluginProvider());
#endif
}

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

	// 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);
}

void PluginManager::loadPlugins() {
	for (ProviderList::iterator pp = _providers.begin();
	                            pp != _providers.end();
	                            ++pp) {
		PluginList pl((**pp).getPlugins());
		for (PluginList::iterator plugin = pl.begin(); plugin != pl.end(); ++plugin) {
			tryLoadPlugin(*plugin);
		}
	}

}

void PluginManager::unloadPlugins() {
	unloadPluginsExcept(NULL);
}

void PluginManager::unloadPluginsExcept(const Plugin *plugin) {
	Plugin *found = NULL;
	for (PluginList::iterator p = _plugins.begin(); p != _plugins.end(); ++p) {
		if (*p == plugin) {
			found = *p;
		} else {
			(**p).unloadPlugin();
			delete *p;
		}
	}
	_plugins.clear();
	if (found != NULL) {
		_plugins.push_back(found);
	}
}

bool PluginManager::tryLoadPlugin(Plugin *plugin) {
	assert(plugin);
	// Try to load the plugin
	if (plugin->loadPlugin()) {
		// If successful, add it to the list of known plugins and return.
		_plugins.push_back(plugin);

		// TODO/FIXME: We should perform some additional checks here:
		// * Check for some kind of "API version" (possibly derived from the
		//   SVN tree revision?)
		// * If two plugins provide the same engine, we should only load one.
		//   To detect this situation, we could just compare the plugin name.
		//   To handle it, simply prefer modules loaded earlier to those coming.
		//   Or vice versa... to be determined... :-)

		return true;
	} else {
		// Failed to load the plugin
		delete plugin;
		return false;
	}
}

GameList PluginManager::detectGames(const FSList &fslist) const {
	GameList candidates;

	// Iterate over all known games and for each check if it might be
	// the game in the presented directory.
	PluginList::const_iterator iter;
	for (iter = _plugins.begin(); iter != _plugins.end(); ++iter) {
		candidates.push_back((*iter)->detectGames(fslist));
	}

	return candidates;
}