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/* 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"
class Engine;
class FSList;
class MetaEngine;
class OSystem;
/**
* Abstract base class for the plugin system.
* Subclasses for this can be used to wrap both static and dynamic
* plugins.
*/
class Plugin {
public:
virtual ~Plugin() {}
virtual bool loadPlugin() = 0;
virtual void unloadPlugin() = 0;
virtual const char *getName() const = 0;
virtual const char *getCopyright() const = 0;
// virtual int getVersion() const { return 0; } // TODO!
virtual GameList getSupportedGames() const = 0;
virtual GameDescriptor findGame(const char *gameid) const = 0;
virtual GameList detectGames(const FSList &fslist) const = 0;
virtual PluginError createInstance(OSystem *syst, Engine **engine) const = 0;
};
/**
* 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.
*/
#ifndef DYNAMIC_MODULES
#define REGISTER_PLUGIN(ID,METAENGINE) \
MetaEngine *g_##ID##_MetaEngine_alloc() { \
return new METAENGINE(); \
} \
void dummyFuncToAllowTrailingSemicolon()
#else
#define REGISTER_PLUGIN(ID,METAENGINE) \
extern "C" { \
PLUGIN_EXPORT MetaEngine *PLUGIN_MetaEngine_alloc() { \
return new METAENGINE(); \
} \
} \
void dummyFuncToAllowTrailingSemicolon()
#endif
/** 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;
};
/**
* 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
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