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/* sc4pd
Logistic, Logistic~
Copyright (c) 2004 Tim Blechmann.
This code is derived from:
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.com
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.
Based on:
PureData by Miller Puckette and others.
http://www.crca.ucsd.edu/~msp/software.html
FLEXT by Thomas Grill
http://www.parasitaere-kapazitaeten.net/ext
SuperCollider by James McCartney
http://www.audiosynth.com
Coded while listening to: Fred Frith: Gravity
*/
#include "sc4pd.hpp"
/* ------------------------ Logistic~ -------------------------------*/
class Logistic_ar:
public sc4pd_dsp
{
FLEXT_HEADER(Logistic_ar,sc4pd_dsp);
public:
Logistic_ar(int argc, t_atom *argv);
protected:
virtual void m_signal(int n, t_sample *const *in, t_sample *const *out);
virtual void m_dsp(int n, t_sample *const *in, t_sample *const *out);
void m_set(float f)
{
m_freq = sc_min(f,m_sr);
}
void m_param(float f)
{
m_paramf = f;
}
private:
int m_freq;
float m_paramf;
int m_sr;
double m_y1;
int m_counter;
FLEXT_CALLBACK_F(m_set);
FLEXT_CALLBACK_F(m_param);
};
FLEXT_LIB_DSP_V("Logistic~",Logistic_ar);
Logistic_ar::Logistic_ar(int argc, t_atom *argv)
{
FLEXT_ADDMETHOD_(0,"set",m_set);
FLEXT_ADDMETHOD_(0,"parameter",m_set);
//parse arguments
AtomList Args(argc,argv);
m_freq = sc_getfloatarg(Args,0);
m_paramf = sc_getfloatarg(Args,1);
m_y1 = sc_getfloatarg(Args,2);
m_sr=48000; // this is just a guess (i'll think about this later)
AddOutSignal();
}
void Logistic_ar::m_dsp(int n, t_sample *const *in,
t_sample *const *out)
{
m_sr = Samplerate();
m_paramf = sc_min(m_paramf,m_sr);
}
void Logistic_ar::m_signal(int n, t_sample *const *in,
t_sample *const *out)
{
t_sample *nout = *out;
if(m_sr == m_paramf)
{
/* it might be possible to implement this without the branch */
double y1 = m_y1;
double paramf = m_paramf;
for (int i = 0; i!= n;++i)
{
(*(nout)++)= y1 = paramf * y1 * (1.0 - y1);
}
m_y1 = y1;
}
else
{
double y1 = m_y1;
double paramf = m_paramf;
int counter = m_counter;
int remain = n;
do
{
if (counter<=0)
{
counter = (int)(m_sr / sc_max(m_freq, .001f));
counter = sc_max(1, counter);
y1 = paramf * y1 * (1.0 - y1);
}
int nsmps = sc_min(remain, counter);
remain -= nsmps;
counter -= nsmps;
for (int i = 0; i!= nsmps;++i)
{
(*(nout)++)=y1;
}
}
while(remain);
m_y1 = y1;
m_counter = counter;
}
}
/* ------------------------ Logistic ---------------------------------*/
class Logistic_kr:
public flext_base
{
FLEXT_HEADER(Logistic_kr,flext_base);
public:
Logistic_kr(int argc, t_atom *argv);
protected:
void m_perform();
void m_param(float f)
{
m_paramf = f;
}
private:
float m_paramf;
double m_y1;
FLEXT_CALLBACK(m_perform);
FLEXT_CALLBACK_F(m_param);
};
FLEXT_LIB_V("Logistic",Logistic_kr);
Logistic_kr::Logistic_kr(int argc, t_atom *argv)
{
FLEXT_ADDMETHOD_(0,"parameter",m_param);
FLEXT_ADDBANG(0,m_perform);
//parse arguments
AtomList Args(argc,argv);
m_paramf = sc_getfloatarg(Args,0);
m_y1 = sc_getfloatarg(Args,1);
AddOutFloat();
}
void Logistic_kr::m_perform()
{
m_y1 = m_paramf * m_y1 * (1.0 - m_y1);
ToOutFloat(0,m_y1);
}
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