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oscillator.h
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//
// oscillator.h
//
// General purpose oscillator
//
// MiniSynth Pi - A virtual analogue synthesizer for Raspberry Pi
// Copyright (C) 2017-2022 R. Stange <[email protected]>
//
// 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/>.
//
#ifndef _oscillator_h
#define _oscillator_h
#include "synthmodule.h"
enum TWaveform
{
WaveformSine,
WaveformSquare,
WaveformSawtooth,
WaveformTriangle,
WaveformPulse12,
WaveformPulse25,
WaveformNoise,
WaveformUnknown
};
class COscillator : public CSynthModule
{
public:
COscillator (CSynthModule *pModulator = 0);
~COscillator (void);
void SetWaveform (TWaveform Waveform);
void SetFrequency (float fFrequency); // in Hz
void SetModulationVolume (float fVolume); // [0.0, 1.0]
void NextSample (void);
float GetOutputLevel (void) const; // returns [-1.0, 1.0]
private:
int GetRandom (void);
static const int RandomMax = 32767;
private:
CSynthModule *m_pModulator;
TWaveform m_Waveform;
float m_fFrequency;
float m_fModulationVolume;
unsigned m_nSampleCount;
float m_fOutputLevel;
unsigned long m_ulRandomNext;
static float s_SineTable[];
};
#endif