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64 lines
1.6 KiB
64 lines
1.6 KiB
/*
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Copyright (C) 2000 Stefan Westerfeld
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stefan@space.twc.de
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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 Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include <stdlib.h>
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#include "artsmodulessynth.h"
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#include "stdsynthmodule.h"
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using namespace Arts;
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namespace Arts {
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#define NOISE_SIZE 8192
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class Synth_NOISE_impl : virtual public Synth_NOISE_skel,
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virtual public StdSynthModule
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{
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static float noise[NOISE_SIZE];
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static bool noiseInit;
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unsigned long pos;
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public:
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Synth_NOISE_impl()
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{
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if(!noiseInit)
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{
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for(unsigned long i=0;i<NOISE_SIZE;i++)
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noise[i] = ((float)rand()/(float)RAND_MAX)*2.0-1.0;
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noiseInit = true;
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}
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}
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void calculateBlock(unsigned long samples)
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{
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unsigned long i;
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pos = rand();
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for(i=0;i<samples;i++) outvalue[i] = noise[pos++ & (NOISE_SIZE-1)];
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}
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};
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float Synth_NOISE_impl::noise[8192];
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bool Synth_NOISE_impl::noiseInit = false;
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REGISTER_IMPLEMENTATION(Synth_NOISE_impl);
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}
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