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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;
import com.jsyn.engine.MultiTable;
import com.jsyn.ports.UnitInputPort;
/**
* Oscillator that can change its shape from sine to sawtooth to pulse.
*
* @author Phil Burk (C) 2016 Mobileer Inc
*/
public class MorphingOscillatorBL extends PulseOscillatorBL {
/**
* Controls the shape of the waveform.
* The shape varies continuously from a sine wave at -1.0,
* to a sawtooth at 0.0 to a pulse wave at 1.0.
*/
public UnitInputPort shape;
public MorphingOscillatorBL() {
addPort(shape = new UnitInputPort("Shape"));
shape.setMinimum(-1.0);
shape.setMaximum(1.0);
}
@Override
protected double generateBL(MultiTable multiTable, double currentPhase,
double positivePhaseIncrement, double flevel, int i) {
double[] shapes = shape.getValues();
double shape = shapes[i];
if (shape < 0.0) {
// Squeeze flevel towards the pure sine table.
flevel += flevel * shape;
return multiTable.calculateSawtooth(currentPhase, positivePhaseIncrement, flevel);
} else {
double[] widths = width.getValues();
double width = widths[i];
width = (width > 0.999) ? 0.999 : ((width < -0.999) ? -0.999 : width);
double val1 = multiTable.calculateSawtooth(currentPhase, positivePhaseIncrement, flevel);
// Generate second sawtooth so we can add them together.
double phase2 = currentPhase + 1.0 - width; // 180 degrees out of phase
if (phase2 >= 1.0) {
phase2 -= 2.0;
}
double val2 = multiTable.calculateSawtooth(phase2, positivePhaseIncrement, flevel);
/*
* Need to adjust amplitude based on positive phaseInc. little less than half at
* Nyquist/2.0!
*/
double scale = 1.0 - positivePhaseIncrement;
return scale * (val1 - ((val2 + width) * shape)); // apply shape morphing
}
}
}
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