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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.
*
* $URL$
* $Id$
*/
/*
* 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 "sound/fmopl.h"
namespace OPL {
namespace DOSBox {
class Handler;
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);
};
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();
};
class Handler {
public:
virtual ~Handler() {}
// Write an address to a chip, returns the address the chip sets
virtual uint32 writeAddr(uint32 port, uint8 val) = 0;
// Write to a specific register in the chip
virtual void writeReg(uint32 addr, uint8 val) = 0;
// Generate a certain amount of samples
virtual void generate(int16 *chan, uint samples) = 0;
// Initialize at a specific sample rate and mode
virtual void init(uint rate) = 0;
};
class OPL : public ::OPL::OPL {
private:
Config::OplType _type;
uint _rate;
Handler *_handler;
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);
bool isStereo() const { return _type != Config::kOpl2; }
};
} // End of namespace DOSBox
} // End of namespace OPL
#endif // !DISABLE_DOSBOX_OPL
#endif
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