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null.cpp

/* 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 "backends/modular-backend.h"
#include "base/main.h"

#if defined(USE_NULL_DRIVER)
#include "backends/saves/default/default-saves.h"
#include "backends/timer/default/default-timer.h"
#include "audio/mixer_intern.h"
#include "common/scummsys.h"

/*
 * Include header files needed for the getFilesystemFactory() method.
 */
#if defined(__amigaos4__)
      #include "backends/fs/amigaos4/amigaos4-fs-factory.h"
#elif defined(UNIX)
      #include "backends/fs/posix/posix-fs-factory.h"
#elif defined(WIN32)
      #include "backends/fs/windows/windows-fs-factory.h"
#endif

class OSystem_NULL : public ModularBackend {
public:
      OSystem_NULL();
      virtual ~OSystem_NULL();

      virtual void initBackend();

      virtual bool pollEvent(Common::Event &event);

      virtual uint32 getMillis();
      virtual void delayMillis(uint msecs);
      virtual void getTimeAndDate(TimeDate &t) const {}

      virtual Common::SeekableReadStream *createConfigReadStream();
      virtual Common::WriteStream *createConfigWriteStream();
};

OSystem_NULL::OSystem_NULL() {
      #if defined(__amigaos4__)
            _fsFactory = new AmigaOSFilesystemFactory();
      #elif defined(UNIX)
            _fsFactory = new POSIXFilesystemFactory();
      #elif defined(WIN32)
            _fsFactory = new WindowsFilesystemFactory();
      #else
            #error Unknown and unsupported FS backend
      #endif
}

OSystem_NULL::~OSystem_NULL() {
}

void OSystem_NULL::initBackend() {
      _mutexManager = (MutexManager *)new NullMutexManager();
      _timerManager = new DefaultTimerManager();
      _eventManager = new DefaultEventManager(this);
      _savefileManager = new DefaultSaveFileManager();
      _graphicsManager = (GraphicsManager *)new NullGraphicsManager();
      _audiocdManager = (AudioCDManager *)new DefaultAudioCDManager();
      _mixer = new Audio::MixerImpl(this, 22050);

      ((Audio::MixerImpl *)_mixer)->setReady(false);

      // Note that both the mixer and the timer manager are useless
      // this way; they need to be hooked into the system somehow to
      // be functional. Of course, can't do that in a NULL backend :).

      OSystem::initBackend();
}

bool OSystem_NULL::pollEvent(Common::Event &event) {
      return false;
}

uint32 OSystem_NULL::getMillis() {
      return 0;
}

void OSystem_NULL::delayMillis(uint msecs) {
}

#define DEFAULT_CONFIG_FILE "scummvm.ini"

Common::SeekableReadStream *OSystem_NULL::createConfigReadStream() {
      Common::FSNode file(DEFAULT_CONFIG_FILE);
      return file.createReadStream();
}

Common::WriteStream *OSystem_NULL::createConfigWriteStream() {
      Common::FSNode file(DEFAULT_CONFIG_FILE);
      return file.createWriteStream();
}

OSystem *OSystem_NULL_create() {
      return new OSystem_NULL();
}

int main(int argc, char *argv[]) {
      g_system = OSystem_NULL_create();
      assert(g_system);

      // Invoke the actual ScummVM main entry point:
      int res = scummvm_main(argc, argv);
      delete (OSystem_NULL *)g_system;
      return res;
}

#else /* USE_NULL_DRIVER */

OSystem *OSystem_NULL_create() {
      return NULL;
}

#endif

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