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/*
* Copyright 2009 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.unitgen;
/**
* Simple triangle wave oscillator.
*
* @author Phil Burk (C) 2009 Mobileer Inc
*/
public class TriangleOscillator extends UnitOscillator {
int frame;
public TriangleOscillator() {
super();
phase.setValue(-0.5);
}
@Override
public void generate(int start, int limit) {
double[] frequencies = frequency.getValues();
double[] amplitudes = amplitude.getValues();
double[] outputs = output.getValues();
// Variables have a single value.
double currentPhase = phase.getValue();
for (int i = start; i < limit; i++) {
/* Generate sawtooth phasor to provide phase for triangle generation. */
double phaseIncrement = convertFrequencyToPhaseIncrement(frequencies[i]);
currentPhase = incrementWrapPhase(currentPhase, phaseIncrement);
/* Map phase to triangle waveform. */
/* 0 - 0.999 => 0.5-p => +0.5 - -0.5 */
/* -1.0 - 0.0 => 0.5+p => -0.5 - +0.5 */
double triangle = (currentPhase >= 0.0) ? (0.5 - currentPhase) : (0.5 + currentPhase);
outputs[i] = triangle * 2.0 * amplitudes[i];
}
// Value needs to be saved for next time.
phase.setValue(currentPhase);
}
}
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