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dosbox.h

/* 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.
 *
 * $URL$
 * $Id$
 */

/*
 * Based on OPL emulation code of DOSBox
 * Copyright (C) 2002-2009  The DOSBox Team
 * Licensed under GPLv2+
 * http://www.dosbox.com
 */

#ifndef SOUND_SOFTSYNTH_OPL_DOSBOX_H
#define SOUND_SOFTSYNTH_OPL_DOSBOX_H

#ifndef DISABLE_DOSBOX_OPL

#include "audio/fmopl.h"

namespace OPL {
namespace DOSBox {

00042 struct Timer {
      double startTime;
      double delay;
      bool enabled, overflow, masked;
      uint8 counter;

      Timer();

      //Call update before making any further changes
      void update(double time);

      //On a reset make sure the start is in sync with the next cycle
      void reset(double time);

      void stop();

      void start(double time, int scale);
};

00061 struct Chip {
      //Last selected register
      Timer timer[2];
      //Check for it being a write to the timer
      bool write(uint32 addr, uint8 val);
      //Read the current timer state, will use current double
      uint8 read();
};

namespace DBOPL {
struct Chip;
} // end of namespace DBOPL

00074 class OPL : public ::OPL::OPL {
private:
      Config::OplType _type;
      uint _rate;

      DBOPL::Chip *_emulator;
      Chip _chip[2];
      union {
            uint16 normal;
            uint8 dual[2];
      } _reg;

      void free();
      void dualWrite(uint8 index, uint8 reg, uint8 val);
public:
      OPL(Config::OplType type);
      ~OPL();

      bool init(int rate);
      void reset();

      void write(int a, int v);
      byte read(int a);

      void writeReg(int r, int v);

      void readBuffer(int16 *buffer, int length);
00101       bool isStereo() const { return _type != Config::kOpl2; }
};

} // End of namespace DOSBox
} // End of namespace OPL

#endif // !DISABLE_DOSBOX_OPL

#endif


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