mirror of https://github.com/badvision/jace.git
82 lines
2.7 KiB
Java
82 lines
2.7 KiB
Java
/*
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* Copyright (C) 2012 Brendan Robert (BLuRry) brendan.robert@gmail.com.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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package jace.hardware.mockingboard;
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import jace.hardware.CardMockingboard;
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/**
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* Square-wave generator used in the PSG sound chip.
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* Created on April 18, 2006, 5:48 PM
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* @author Brendan Robert (BLuRry) brendan.robert@gmail.com
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*/
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public class SoundGenerator extends TimedGenerator {
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int amplitude;
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boolean useEnvGen;
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boolean active;
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boolean noiseActive;
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boolean inverted;
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public SoundGenerator(int _clock, int _sampleRate) {
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super(_clock, _sampleRate);
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}
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@Override
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public int stepsPerCycle() {
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return 8;
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}
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public void setAmplitude(int _amp) {
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amplitude = (_amp & 0x0F);
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useEnvGen = (_amp & 0x010) != 0;
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}
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public void setActive(boolean _active) {
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active = _active;
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}
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public void setNoiseActive(boolean _active) {
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noiseActive = _active;
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}
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@Override
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public void setPeriod(int _period) {
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super.setPeriod(_period);
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}
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public int step(NoiseGenerator noiseGen, EnvelopeGenerator envGen) {
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int stateChanges = updateCounter();
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if (((stateChanges & 1) == 1)) inverted = !inverted;
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if (amplitude == 0 && !useEnvGen) return 0;
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if (!active && !noiseActive) return 0;
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boolean invert = false;
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int vol = useEnvGen ? envGen.getAmplitude() : amplitude;
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if (active) {
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invert = noiseActive && noiseGen.isOn() ? false : inverted;
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} else {
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invert = noiseActive && !noiseGen.isOn();
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}
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return invert ? -CardMockingboard.VolTable[vol] : CardMockingboard.VolTable[vol];
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}
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@Override
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public void reset() {
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super.reset();
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amplitude = 0;
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useEnvGen = false;
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active = false;
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noiseActive = false;
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inverted = false;
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}
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}; |