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//
//
// chaos~
// Copyright (C) 2004 Tim Blechmann
//
// 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; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
#include "chaos_base.hpp"
template <class system> class chaos_dsp
: public flext_dsp
{
FLEXT_HEADER(chaos_dsp, flext_dsp);
public:
/* signal functions: */
/* for frequency = sr/2 */
void m_signal_(int n, t_sample *const *insigs,t_sample *const *outsigs);
/* sample & hold */
void m_signal_n(int n, t_sample *const *insigs,t_sample *const *outsigs);
/* linear interpolation */
void m_signal_l(int n, t_sample *const *insigs,t_sample *const *outsigs);
/* cubic interpolatio */
void m_signal_c(int n, t_sample *const *insigs,t_sample *const *outsigs);
virtual void m_signal(int n, t_sample *const *insigs,t_sample *const *outsigs)
{
(this->*m_routine)(n,insigs,outsigs);
}
virtual void m_dsp(int n, t_sample *const *insigs,t_sample *const *outsigs)
{
m_sr = Samplerate();
}
void (thisType::*m_routine)(int n, t_sample *const *insigs,t_sample *const *outsigs);
/* local data for system, output and interpolation */
system * m_system; /* the system */
t_sample * m_values; /* actual value */
t_sample * m_slopes; /* actual slope for cubic interpolation */
t_sample * m_nextvalues;
t_sample * m_nextmidpts;
t_sample * m_curves;
/* local data for signal functions */
float m_freq; /* frequency of oscillations */
float m_invfreq; /* inverse frequency */
int m_phase; /* phase counter */
float m_sr; /* sample rate */
int m_imethod; /* interpolation method */
void get_imethod(int &i)
{
i = m_imethod;
}
void set_imethod(int i)
{
int imethod = m_imethod;
if( (i >= 0) && (i <= 2) )
{
m_imethod = i;
switch (i)
{
case 0:
m_routine = &thisType::m_signal_n;
break;
case 1:
m_routine = &thisType::m_signal_l;
break;
case 2:
m_routine = &thisType::m_signal_c;
break;
}
}
else
{
post("interpolation method out of range");
return;
}
if (imethod == 0)
for (int j = 0; j != m_system->get_num_eq(); ++j)
{
m_values[j] = m_system->get_data(j);
m_slopes[j] = 0;
}
if( i == 2)
{
for (int j = 0; j != m_system->get_num_eq(); ++j)
{
m_phase = 0; /* reschedule to avoid click, find a better way later*/
m_nextvalues[j] = m_values[j];
m_nextmidpts[j] = m_values[j];
}
}
}
void get_freq(float &f)
{
f = m_freq;
}
void set_freq(float f)
{
if( (f >= 0) && (f <= m_sr*0.5) )
{
m_freq = f;
m_invfreq = 1.f / f;
}
else
post("frequency out of range");
}
FLEXT_CALLVAR_F(get_freq, set_freq);
FLEXT_CALLVAR_I(get_imethod, set_imethod);
};
/* create constructor / destructor */
#define CHAOS_DSP_INIT(SYSTEM, ATTRIBUTES) \
FLEXT_HEADER(SYSTEM##_dsp, chaos_dsp<SYSTEM>) \
\
SYSTEM##_dsp(int argc, t_atom* argv ) \
{ \
m_sr = 44100; /* assume default sampling rate */ \
m_system = new SYSTEM; \
\
int size = m_system->get_num_eq(); \
\
m_values = new t_float[size]; \
m_slopes = new t_float[size]; \
m_nextvalues = new t_float[size]; \
m_nextmidpts = new t_float[size]; \
m_curves = new t_float[size]; \
\
/* create inlets and zero arrays*/ \
for (int i = 0; i != size; ++i) \
{ \
AddOutSignal(); \
m_values[i] = 0; \
m_slopes[i] = 0; \
m_nextvalues[i] = 0; \
m_nextmidpts[i] = 0; \
m_curves[i] = 0; \
} \
\
FLEXT_ADDATTR_VAR("frequency", get_freq, set_freq); \
FLEXT_ADDATTR_VAR("interpolation_method",get_imethod, set_imethod); \
\
if (argc > 0) \
{ \
CHAOS_SYS_INIT(freq, GetAInt(argv[0])); \
} \
else \
{ \
CHAOS_SYS_INIT(freq, 440); \
} \
\
if (argc > 1) \
{ \
CHAOS_SYS_INIT(imethod, GetAInt(argv[1])); \
} \
else \
{ \
CHAOS_SYS_INIT(imethod, 0); \
} \
\
m_phase = 0; \
\
ATTRIBUTES; \
} \
\
~SYSTEM##_dsp() \
{ \
delete m_system; \
delete m_values; \
delete m_slopes; \
delete m_nextvalues; \
delete m_nextmidpts; \
delete m_curves; \
} \
\
FLEXT_ATTRVAR_F(m_freq); \
FLEXT_ATTRVAR_I(m_imethod);
template <class system>
void chaos_dsp<system>::m_signal_(int n, t_sample *const *insigs,
t_sample *const *outsigs)
{
int outlets = m_system->get_num_eq();
for (int i = 0; i!=n; ++i)
{
m_system->m_perform();
for (int j = 0; j != outlets; ++j)
{
outsigs[j][i] = m_system->get_data(j);
}
}
}
template <class system>
void chaos_dsp<system>::m_signal_n(int n, t_sample *const *insigs,
t_sample *const *outsigs)
{
int outlets = m_system->get_num_eq();
int phase = m_phase;
int offset = 0;
while (n)
{
if (phase == 0)
{
m_system->m_perform();
phase = int (m_sr * m_invfreq);
}
int next = (phase < n) ? phase : n;
n -= next;
phase -=next;
for (int i = 0; i != outlets; ++i)
{
SetSamples(outsigs[i]+offset, next, m_system->get_data(i));
}
offset += next;
}
m_phase = phase;
}
/* linear and cubic interpolation adapted from supercollider by James McCartney */
template <class system>
void chaos_dsp<system>::m_signal_l(int n, t_sample *const *insigs,
t_sample *const *outsigs)
{
int outlets = m_system->get_num_eq();
int phase = m_phase;
int i = 0;
while (n)
{
if (phase == 0)
{
m_system->m_perform();
phase = int (m_sr * m_invfreq);
for (int j = 0; j != outlets; ++j)
m_slopes[j] = (m_system->get_data(j) - m_values[j]) / phase;
}
int next = (phase < n) ? phase : n;
n -= next;
phase -=next;
while (next--)
{
for (int j = 0; j != outlets; ++j)
{
outsigs[j][i] = m_values[j];
m_values[j]+=m_slopes[j];
}
++i;
}
}
m_phase = phase;
}
template <class system>
void chaos_dsp<system>::m_signal_c(int n, t_sample *const *insigs,
t_sample *const *outsigs)
{
int outlets = m_system->get_num_eq();
int phase = m_phase;
int i = 0;
while (n)
{
if (phase == 0)
{
m_system->m_perform();
phase = int (m_sr * m_invfreq);
phase = (phase > 2) ? phase : 2;
for (int j = 0; j != outlets; ++j)
{
t_sample value = m_nextvalues[j];
m_nextvalues[j]= m_system->get_data(j);
m_values[j] = m_nextmidpts[j];
m_nextmidpts[j] = (m_nextvalues[j] + value) * 0.5f;
float fseglen = (float)phase;
m_curves[j] = 2.f * (m_nextmidpts[j] - m_values[j] -
fseglen * m_slopes[j])
/ (fseglen * fseglen + fseglen);
}
}
int next = (phase < n) ? phase : n;
n -= next;
phase -=next;
while (next--)
{
for (int j = 0; j != outlets; ++j)
{
outsigs[j][i] = m_values[j];
m_slopes[j]+=m_curves[j];
m_values[j]+=m_slopes[j];
}
++i;
}
}
m_phase = phase;
}
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