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engine.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2006 The ScummVM project
 *
 * 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: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/base/engine.h $
 * $Id: engine.h 22199 2006-04-29 00:27:20Z fingolfin $
 */

#ifndef BASE_ENGINE_H
#define BASE_ENGINE_H

#include "common/stdafx.h"
#include "common/scummsys.h"
#include "common/str.h"

class OSystem;
namespace Audio {
      class Mixer;
}
namespace Common {
      class SaveFileManager;
      class Timer;
}

class Engine {
public:
      OSystem *_system;
      Audio::Mixer *_mixer;
      Common::Timer * _timer;

protected:
      const Common::String _targetName; // target name for saves
      const Common::String _gameDataPath;
      Common::SaveFileManager *_saveFileMan;

private:
      int _autosavePeriod;

public:
      Engine(OSystem *syst);
      virtual ~Engine();

      /**
       * Init the engine.
       * @return 0 for success, else an error code.
       */
      virtual int init() = 0;

      /**
       * Start the main engine loop.
       * The return value is not yet used, but could indicate whether the user
       * wants to return to the launch or to fully quit ScummVM.
       * @return a result code
       */
      virtual int go() = 0;

      /** Specific for each engine: prepare error string. */
      virtual void errorString(const char *buf_input, char *buf_output);

      void initCommonGFX(bool defaultTo1XScaler);

      /** On some systems, check if the game appears to be run from CD. */
      void checkCD();

      /* Indicate if an autosave should be performed. */
      bool shouldPerformAutoSave(int lastSaveTime);

      /** Initialized graphics and shows error message. */
      void GUIErrorMessage(const Common::String msg);
};

extern Engine *g_engine;

#endif

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