LMMS/plugins/Delay/Lfo.h

/*
 * lfo.h - declaration of Lfo class, a simple sine lfo
 *
 * Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
 *
 * This file is part of LMMS - https://lmms.io
 *
 * 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 (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */

#ifndef LFO_H
#define LFO_H

#include "lmms_math.h"

class Lfo
{
public:
	Lfo( int samplerate );
	~Lfo()
	{
	}




	inline void setFrequency( double frequency )
	{
		if( frequency < 0 || frequency > ( m_samplerate / 2.0 ) || frequency == m_frequency )
		{
			return;
		}
		m_frequency = frequency;
		m_increment = m_frequency * m_twoPiOverSr;

		if( m_phase >= F_2PI )
		{
			m_phase -= F_2PI;
		}
	}




	inline void setSampleRate ( int samplerate )
	{
		m_samplerate = samplerate;
		m_twoPiOverSr = F_2PI / samplerate;
		m_increment = m_frequency * m_twoPiOverSr;
	}




	float tick();

private:
	double m_frequency;
	double m_phase;
	double m_increment;
	double m_twoPiOverSr;
	int m_samplerate;
};

#endif // LFO_H