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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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
/*
* Based on OPL emulation code of DOSBox
* Copyright (C) 2002-2009 The DOSBox Team
* Licensed under GPLv2+
* http://www.dosbox.com
*/
#ifndef AUDIO_SOFTSYNTH_OPL_DOSBOX_H
#define AUDIO_SOFTSYNTH_OPL_DOSBOX_H
#ifndef DISABLE_DOSBOX_OPL
#include "audio/fmopl.h"
namespace OPL {
namespace DOSBox {
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();
};
namespace DBOPL {
struct Chip;
} // end of namespace DBOPL
class OPL : public ::OPL::OPL, public Audio::EmulatedChip {
private:
Config::OplType _type;
uint _rate;
DBOPL::Chip *_emulator;
::OPL::DOSBox::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();
void reset();
void write(int a, int v);
void writeReg(int r, int v);
bool isStereo() const { return _type != Config::kOpl2; }
protected:
void generateSamples(int16 *buffer, int length);
};
} // End of namespace DOSBox
} // End of namespace OPL
#endif // !DISABLE_DOSBOX_OPL
#endif
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