mirror of
https://github.com/libretro/scummvm.git
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128 lines
3.2 KiB
C++
128 lines
3.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#ifndef BACKENDS_PLUGINS_DYNAMICPLUGIN_H
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#define BACKENDS_PLUGINS_DYNAMICPLUGIN_H
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#include "base/plugins.h"
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/** Type of factory functions which make new Engine objects. */
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typedef PluginError (*EngineFactory)(OSystem *syst, Engine **engine);
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typedef const char *(*NameFunc)();
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typedef GameDescriptor (*GameIDQueryFunc)(const char *gameid);
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typedef GameList (*GameIDListFunc)();
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typedef GameList (*DetectFunc)(const FSList &fslist);
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class DynamicPlugin : public Plugin {
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protected:
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typedef void (*VoidFunc)();
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Common::String _name;
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Common::String _copyright;
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GameIDQueryFunc _qf;
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EngineFactory _ef;
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DetectFunc _df;
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GameList _games;
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virtual VoidFunc findSymbol(const char *symbol) = 0;
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public:
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DynamicPlugin() : _qf(0), _ef(0), _df(0), _games() {}
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const char *getName() const { return _name.c_str(); }
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const char *getCopyright() const { return _copyright.c_str(); }
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PluginError createInstance(OSystem *syst, Engine **engine) const {
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assert(_ef);
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return (*_ef)(syst, engine);
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}
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GameList getSupportedGames() const { return _games; }
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GameDescriptor findGame(const char *gameid) const {
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assert(_qf);
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return (*_qf)(gameid);
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}
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GameList detectGames(const FSList &fslist) const {
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assert(_df);
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return (*_df)(fslist);
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}
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virtual bool loadPlugin() {
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// Query the plugin's name
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NameFunc nameFunc = (NameFunc)findSymbol("PLUGIN_name");
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if (!nameFunc) {
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unloadPlugin();
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return false;
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}
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_name = nameFunc();
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// Query the plugin's copyright
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nameFunc = (NameFunc)findSymbol("PLUGIN_copyright");
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if (!nameFunc) {
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unloadPlugin();
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return false;
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}
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_copyright = nameFunc();
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// Query the plugin for the game ids it supports
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GameIDListFunc gameListFunc = (GameIDListFunc)findSymbol("PLUGIN_gameIDList");
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if (!gameListFunc) {
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unloadPlugin();
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return false;
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}
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_games = gameListFunc();
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// Retrieve the gameid query function
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_qf = (GameIDQueryFunc)findSymbol("PLUGIN_findGameID");
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if (!_qf) {
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unloadPlugin();
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return false;
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}
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// Retrieve the factory function
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_ef = (EngineFactory)findSymbol("PLUGIN_createEngine");
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if (!_ef) {
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unloadPlugin();
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return false;
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}
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// Retrieve the detector function
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_df = (DetectFunc)findSymbol("PLUGIN_detectGames");
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if (!_df) {
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unloadPlugin();
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return false;
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}
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return true;
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}
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};
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#endif
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