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Viewing changes to plugins/ladspa_effect/caps/dsp/Roessler.h

  • Committer: Bazaar Package Importer
  • Author(s): Tobias Doerffel
  • Date: 2007-09-17 15:00:24 UTC
  • mfrom: (1.1.4 upstream)
  • Revision ID: james.westby@ubuntu.com-20070917150024-mo0zk4ks81jawqii
Tags: 0.3.0-1ubuntu1
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* Resynchronized with Debian (LP: #139759, LP: #90806, LP: #102639,
  LP: #113447, LP: #121172, LP: #124890)
* reverted changes from 0.2.1-1.1ubuntu1 as upstream merged/included them

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plugins/ladspa_effect/caps/dsp/Roessler.h
 
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/*
 
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        dsp/Roessler.h
 
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        Copyright 2003-4 Tim Goetze <tim@quitte.de>
 
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        http://quitte.de/dsp/
 
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        Roessler fractal.
 
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*/
 
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/*
 
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        This program is free software; you can redistribute it and/or
 
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        modify it under the terms of the GNU General Public License
 
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        as published by the Free Software Foundation; either version 2
 
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        of the License, or (at your option) any later version.
 
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        This program 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
 
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        GNU General Public License for more details.
 
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        You should have received a copy of the GNU General Public License
 
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        along with this program; if not, write to the Free Software
 
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        Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 
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        02111-1307, USA or point your web browser to http://www.gnu.org.
 
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*/
 
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#ifndef _DSP_ROESSLER_H_
 
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#define _DSP_ROESSLER_H_
 
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namespace DSP {
 
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class Roessler
 
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{
 
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        public:
 
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                double x[2], y[2], z[2];        
 
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                double h, a, b, c;
 
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                int I;
 
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        public:
 
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                Roessler()
 
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                        {
 
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                                h = 0.001;
 
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                                a = .2;
 
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                                b = .2;
 
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                                c = 5.7;
 
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                        }
 
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                /* rate is normalized (0 .. 1) */
 
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                void set_rate (double r)
 
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                        {
 
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                                h = max (.000001, r * .096);
 
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                        }
 
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                void init (double _h = .001, double seed = .0)
 
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                        {
 
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                                h = _h;
 
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                                I = 0;
 
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                                x[0] = .0001 + .0001 * seed;
 
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                                y[0] = .0001;
 
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                                z[0] = .0001;
 
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                                for (int i = 0; i < 5000; ++i)
 
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                                        get();
 
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                        }
 
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                d_sample get()
 
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                        {
 
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                                int J = I ^ 1;
 
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                                x[J] = x[I] + h * (- y[I] - z[I]);
 
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                                y[J] = y[I] + h * (x[I] + a * y[I]);
 
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                                z[J] = z[I] + h * (b + z[I] * (x[I] - c));
 
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                                I = J;
 
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                                return x[I] * .01725 + z[I] * .015;
 
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                        }
 
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                double get_x()
 
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                        {
 
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                                return x[I];
 
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                        }
 
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                double get_y()
 
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                        {
 
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                                return y[I];
 
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                        }
 
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                double get_z()
 
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                        {
 
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                                return z[I];
 
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                        }
 
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};
 
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} /* namespace DSP */
 
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#endif /* _DSP_ROESSLER_H_ */