1 files changed, 142 insertions, 0 deletions
diff --git a/sc4pd/source/sc-.cpp b/sc4pd/source/sc-.cpp
new file mode 100644
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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;
+	    }
+	}
+    }
+}
+