mirror of https://github.com/badvision/jace.git
48 lines
1.7 KiB
Java
48 lines
1.7 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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/**
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* Noise generator of the PSG sound chip.
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* Created on April 18, 2006, 5:47 PM
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* @author Brendan Robert (BLuRry) brendan.robert@gmail.com
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*/
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public class NoiseGenerator extends TimedGenerator {
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int rng = 0x003333;
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public NoiseGenerator(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 step() {
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int stateChanges = updateCounter();
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for (int i=0; i < stateChanges; i++)
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updateRng();
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}
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public static final int bit17 = 0x010000;
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public void updateRng() {
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int newBit17 = (rng & 0x04) > 0 == (rng & 0x01) > 0 ? bit17 : 0;
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rng = newBit17 + (rng >> 1);
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}
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public boolean isOn() {
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return ((rng & 1) == 1);
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}
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} |