/*
** FamiTracker - NES/Famicom sound tracker
** Copyright (C) 2005-2012  Jonathan Liss
**
** 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 
** Library General Public License for more details.  To obtain a 
** copy of the GNU Library General Public License, write to the Free 
** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
** Any permitted reproduction of these routines, in whole or in part,
** must bear this legend.
*/

/*
 * Square wave
 *
 */

#ifndef _SQUARE_H_
#define _SQUARE_H_

#include "channel.h"

class CSquare : public CChannel {
public:
	CSquare(CMixer *pMixer, int ID, int Chip);
	~CSquare();

	void	Reset();
	void	Write(uint16 Address, uint8 Value);
	void	WriteControl(uint8 Value);
	uint8	ReadControl();
	void	Process(uint32 Time);

	void	LengthCounterUpdate();
	void	SweepUpdate(int Diff);
	void	EnvelopeUpdate();

public:
	static const uint8 DUTY_TABLE[4][16];

private:
	uint8	m_iDutyLength, m_iDutyCycle;

	uint8	m_iLooping, m_iEnvelopeFix, m_iEnvelopeSpeed;
	uint8	m_iEnvelopeVolume, m_iFixedVolume;
	int8	m_iEnvelopeCounter;

	uint8	m_iSweepEnabled, m_iSweepPeriod, m_iSweepMode, m_iSweepShift;
	int16	m_iSweepCounter, m_iSweepResult;
	bool	m_bSweepWritten;
};

#endif /* _SQUARE_H_ */