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Lorenz.cc

/*
      Lorenz.cc
      
      Copyright 2002-4 Tim Goetze <tim@quitte.de>
      
      http://quitte.de/dsp/

      the sound of a Lorenz attractor.

*/
/*
      This program is free software; you can redistribute it and/or
      modify it under the terms of the GNU General Public License
      as published by the Free Software Foundation; either version 2
      of the License, or (at your option) any later version.

      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software
      Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
      02111-1307, USA or point your web browser to http://www.gnu.org.
*/

#include <stdlib.h>

#include "basics.h"

#include "Lorenz.h"
#include "Descriptor.h"

void
Lorenz::init (double _fs)
{
      fs = _fs;
      lorenz.init (h = .001, 0.1 * frandom());
      gain = 0;
}

template <sample_func_t F>
void
Lorenz::one_cycle (int frames)
{
      lorenz.set_rate (*ports[0]);

      double g = (gain == *ports[4]) ? 
            1 : pow (*ports[4] / gain, 1. / (double) frames);

      d_sample * d = ports[5];

      d_sample x, sx = *ports[1], sy = *ports[2], sz = *ports[3];
      
      for (int i = 0; i < frames; ++i)
      {
            lorenz.step();

            x = sx * lorenz.get_x() + sy * lorenz.get_y() + sz * lorenz.get_z();

            F (d, i, gain * x, adding_gain);
            gain *= g;
      }

      gain = *ports[4];
}

/* //////////////////////////////////////////////////////////////////////// */

PortInfo
Lorenz::port_info [] =
{
      {
            "h",
            INPUT | CONTROL,
            {BOUNDED, 0, 1}
      }, {
            "x",
            INPUT | CONTROL,
            {BOUNDED | DEFAULT_1, 0, 1}
      }, {
            "y",
            INPUT | CONTROL,
            {BOUNDED | DEFAULT_0, 0, 1}
      }, {
            "z",
            INPUT | CONTROL,
            {BOUNDED | DEFAULT_0, 0, 1}
      }, {
            "volume",
            INPUT | CONTROL,
            {BOUNDED | DEFAULT_MID, MIN_GAIN, 1}
      }, {
            "out",
            OUTPUT | AUDIO,
            {0}
      }
};

Descriptor<Lorenz>::Descriptor<Lorenz>()
{
      UniqueID = 1774;
      Label = "Lorenz";
      Properties = HARD_RT;

      Name = "The sound of a Lorenz attractor";
      Maker = "Tim Goetze <tim@quitte.de>";
      Copyright = "GPL, 2004";

      /* fill port info and vtable */
      autogen();
}


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