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
|
/* 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.
*
* $URL$
* $Id$
*
*/
#ifndef BASE_PLUGINS_H
#define BASE_PLUGINS_H
#include "common/array.h"
#include "common/error.h"
#include "common/list.h"
#include "common/singleton.h"
#include "common/util.h"
#include "base/game.h"
/**
* Abstract base class for the plugin objects which handle plugins
* instantiation. Subclasses for this may be used for engine plugins
* and other types of plugins.
*/
class PluginObject {
public:
virtual ~PluginObject() {}
/** Returns the name of the plugin. */
virtual const char *getName() const = 0;
};
#include "engines/metaengine.h"
// Global Plugin API version
#define PLUGIN_VERSION 1
enum PluginType {
PLUGIN_TYPE_ENGINE = 0,
PLUGIN_TYPE_MAX
};
// TODO: Make the engine API version depend on ScummVM's version
// because of the backlinking
#define PLUGIN_TYPE_ENGINE_VERSION 1
extern int pluginTypeVersions[PLUGIN_TYPE_MAX];
class Engine;
class FSList;
class OSystem;
/**
* Abstract base class for the plugin system.
* Subclasses for this can be used to wrap both static and dynamic
* plugins.
*/
class Plugin {
protected:
PluginObject *_pluginObject;
PluginType _type;
public:
Plugin() : _pluginObject(0) {}
virtual ~Plugin() {
//if (isLoaded())
//unloadPlugin();
}
// virtual bool isLoaded() const = 0; // TODO
virtual bool loadPlugin() = 0; // TODO: Rename to load() ?
virtual void unloadPlugin() = 0; // TODO: Rename to unload() ?
PluginType getType() const;
const char *getName() const;
const char *getCopyright() const;
PluginError createInstance(OSystem *syst, Engine **engine) const;
GameList getSupportedGames() const;
GameDescriptor findGame(const char *gameid) const;
GameList detectGames(const FSList &fslist) const;
SaveStateList listSaves(const char *target) const;
};
#define STATIC_PLUGIN 1
#define DYNAMIC_PLUGIN 2
#define PLUGIN_ENABLED_STATIC(ID) \
(defined(ENABLE_##ID) && !PLUGIN_ENABLED_DYNAMIC(ID))
// HACK for MSVC
#if defined(_MSC_VER)
#undef PLUGIN_ENABLED_STATIC
#define PLUGIN_ENABLED_STATIC(ID) 1
#endif
#define PLUGIN_ENABLED_DYNAMIC(ID) \
(defined(ENABLE_##ID) && (ENABLE_##ID == DYNAMIC_PLUGIN) && defined(DYNAMIC_MODULES))
/**
* REGISTER_PLUGIN is a convenience macro meant to ease writing
* the plugin interface for our modules. In particular, using it
* makes it possible to compile the very same code in a module
* both as a static and a dynamic plugin.
*
* @todo add some means to query the plugin API version etc.
*/
#define REGISTER_PLUGIN_STATIC(ID,TYPE,PLUGINCLASS) \
PluginType g_##ID##_type = TYPE; \
PluginObject *g_##ID##_getObject() { \
return new PLUGINCLASS(); \
} \
void dummyFuncToAllowTrailingSemicolon()
#ifdef DYNAMIC_MODULES
#define REGISTER_PLUGIN_DYNAMIC(ID,TYPE,PLUGINCLASS) \
extern "C" { \
PLUGIN_EXPORT int32 PLUGIN_getVersion() { return PLUGIN_VERSION; } \
PLUGIN_EXPORT int32 PLUGIN_getType() { return TYPE; } \
PLUGIN_EXPORT int32 PLUGIN_getTypeVersion() { return TYPE##_VERSION; } \
PLUGIN_EXPORT PluginObject *PLUGIN_getObject() { \
return new PLUGINCLASS(); \
} \
} \
void dummyFuncToAllowTrailingSemicolon()
#endif // DYNAMIC_MODULES
/** List of plugins. */
typedef Common::Array<Plugin *> PluginList;
class PluginProvider {
public:
virtual ~PluginProvider() {}
/**
* Return a list of Plugin objects. The caller is responsible for actually
* loading/unloading them (by invoking the appropriate methods).
* Furthermore, the caller is responsible for deleting these objects
* eventually.
*/
virtual PluginList getPlugins() = 0;
};
class FilePluginProvider : public PluginProvider {
public:
virtual PluginList getPlugins();
protected:
virtual Plugin* createPlugin(const Common::String &filename) const = 0;
virtual const char* getPrefix() const;
virtual const char* getSuffix() const;
virtual void addCustomDirectories(Common::StringList &dirs) const;
};
/**
* Instances of this class manage all plugins, including loading them,
* making wrapper objects of class Plugin available, and unloading them.
*/
class PluginManager : public Common::Singleton<PluginManager> {
typedef Common::List<PluginProvider *> ProviderList;
private:
PluginList _plugins;
ProviderList _providers;
bool tryLoadPlugin(Plugin *plugin);
friend class Common::Singleton<SingletonBaseType>;
PluginManager();
public:
~PluginManager();
void addPluginProvider(PluginProvider *pp);
void loadPlugins();
void unloadPlugins();
void unloadPluginsExcept(const Plugin *plugin);
const PluginList &getPlugins() { return _plugins; }
GameList detectGames(const FSList &fslist) const;
};
#endif
|
