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/*
Fractals.cc
Copyright 2002-13 Tim Goetze <tim@quitte.de>
http://quitte.de/dsp/
Lorenz and Roessler attractors made audible.
*/
/*
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 3
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 "Fractals.h"
#include "Descriptor.h"
void
Fractal::init()
{
lorenz.init (h = .001, 0.1*frandom());
roessler.init (h = .001, frandom());
gain = 1;
}
void
Fractal::activate()
{
gain = getport(6);
hp.reset();
}
template <yield_func_t F>
void
Fractal::cycle (uint frames)
{
float mode = getport(1);
if (mode < .5)
subcycle<F,0> (frames);
else
subcycle<F,1> (frames);
}
template <yield_func_t yield, int Mode>
void
Fractal::subcycle (uint frames)
{
float r = 2.268e-05*fs*getport(0);
lorenz.set_rate(r);
roessler.set_rate(r);
float f = getport(5);
if (f) hp.set_f (f*200*over_fs);
else hp.identity();
float _gain = getport(6);
float g = _gain*_gain;
g = (gain == g) ? 1 : pow (g/gain, 1./(double)frames);
sample_t * d = ports[7];
sample_t sx=getport(2), sy=getport(3), sz=getport(4);
for (uint i = 0; i < frames; ++i)
{
sample_t x;
if (Mode == 0)
{
lorenz.step();
x = sx*lorenz.get_x() + sy*lorenz.get_y() + sz*lorenz.get_z();
}
else /* Mode == 1 */
{
roessler.step();
x = sx*roessler.get_x() + sy*roessler.get_y() + sz*roessler.get_z();
}
x = hp.process (x + normal);
yield (d, i, gain*x, adding_gain);
gain *= g;
}
gain = _gain;
}
/* //////////////////////////////////////////////////////////////////////// */
PortInfo
Fractal::port_info [] =
{
{ "rate", CTRL_IN, {DEFAULT_LOW, 0, 1} },
{ "mode", CTRL_IN, {DEFAULT_0 | INTEGER, 0, 1},
"{0:'lorenz',1:'roessler'}" },
{ "x", CTRL_IN | GROUP, {DEFAULT_1, 0, 1} },
{ "y", CTRL_IN, {DEFAULT_0, 0, 1} },
{ "z", CTRL_IN, {DEFAULT_MID, 0, 1} },
{ "hp", CTRL_IN | GROUP, {DEFAULT_MID, 0, 1} },
{ "volume", CTRL_IN, {DEFAULT_MID, MIN_GAIN, 1} },
{ "out", OUTPUT | AUDIO }
};
template <> void
Descriptor<Fractal>::setup()
{
Label = "Fractal";
Name = CAPS "Fractal - Audio stream from deterministic chaos";
Maker = "Tim Goetze <tim@quitte.de>";
Copyright = "2004-13";
/* fill port info and vtable */
autogen();
}
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