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/* sc4pd
sc-~
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: Phil Minton & Veryan Weston: Ways
*/
#include "sc4pd.hpp"
/* ------------------------ sc-~ -------------------------------*/
class scsub_ar:
public sc4pd_dsp
{
FLEXT_HEADER(scsub_ar,sc4pd_dsp);
public:
scsub_ar(int argc, t_atom *argv);
protected:
virtual void m_signal(int n, t_sample *const *in, t_sample *const *out);
void m_set(float f)
{
m_nextsubtrahend = f;
changed = true;
}
float m_nextsubtrahend, m_subtrahend;
bool changed;
bool invert;
private:
FLEXT_CALLBACK_1(m_set,float);
};
FLEXT_LIB_DSP_V("sc-~",scsub_ar);
scsub_ar::scsub_ar(int argc, t_atom *argv)
{
FLEXT_ADDMETHOD(1,m_set);
//parse arguments
AtomList Args(argc,argv);
m_subtrahend = sc_getfloatarg(Args,0);
invert = sc_inv(Args);
AddInSignal("signal");
AddInFloat("scalar");
AddOutSignal();
changed = false;
}
void scsub_ar::m_signal(int n, t_sample *const *in,
t_sample *const *out)
{
t_sample *nin = *in;
t_sample *nout = *out;
if (invert)
{
if (changed)
{
float xb = m_nextsubtrahend;
float slope = CALCSLOPE(xb, m_subtrahend);
for (int i = 0; i!=n; ++i)
{
ZXP(nout) = xb - ZXP(nin);
xb += slope;
}
m_subtrahend = xb;
changed = false;
}
else
{
float xb = m_subtrahend;
for (int i = 0; i!=n; ++i)
{
ZXP(nout) = xb - ZXP(nin);
}
}
}
else
{
if (changed)
{
float xb = m_nextsubtrahend;
float slope = CALCSLOPE(xb, m_subtrahend);
for (int i = 0; i!=n; ++i)
{
ZXP(nout) = ZXP(nin) - xb;
xb += slope;
}
m_subtrahend = xb;
changed = false;
}
else
{
float xb = m_subtrahend;
for (int i = 0; i!=n; ++i)
{
ZXP(nout) = ZXP(nin) - xb;
}
}
}
}
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