1 files changed, 131 insertions, 0 deletions
diff --git a/sc4pd/source/difsqr.cpp b/sc4pd/source/difsqr.cpp
new file mode 100644
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+++ b/sc4pd/source/difsqr.cpp
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+/* sc4pd 
+   difsqr, difsqr~
+
+   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: Evan Parker & Keith Rowe: Dark Rags
+   
+*/
+
+#include "sc4pd.hpp"
+
+
+inline float sc_difsqr (float a, float b)
+{
+    return a*a-b*b;
+}
+
+
+/* ------------------------ difsqr~ -----------------------------*/
+
+class difsqr_ar
+    :public sc4pd_dsp
+{
+    FLEXT_HEADER(difsqr_ar,sc4pd_dsp);
+
+public:
+    difsqr_ar(int argc,t_atom * argv);
+
+protected:
+    virtual void m_signal(int n, t_sample *const *in, t_sample *const *out);
+
+private:
+    
+};
+
+FLEXT_LIB_DSP_V("difsqr~",difsqr_ar);
+
+difsqr_ar::difsqr_ar(int argc,t_atom * argv)
+{
+    AddInSignal();
+    AddInSignal();
+    AddOutSignal();
+}
+
+void difsqr_ar::m_signal(int n, t_sample *const *in, 
+				t_sample *const *out)
+{
+    t_sample *nout = *out;
+    t_sample *nin1 = *in;
+    t_sample *nin2 = *(in+1);
+
+    for (int i = 0; i!= n;++i)
+    {
+	if( *nin2 > 0)
+	    (*(nout)++) = sc_difsqr( (*(nin1)++), (*(nin2)++) );
+    }
+}
+
+
+
+/* ------------------------ difsqr ------------------------------*/
+
+class difsqr_kr
+    :public flext_base
+{
+    FLEXT_HEADER(difsqr_kr,flext_base);
+
+public:
+    difsqr_kr(int argc,t_atom * argv);
+
+protected:
+    void m_perform(float f);
+    void m_set(float f);
+    
+private:
+    float b;
+    FLEXT_CALLBACK_F(m_perform);
+    FLEXT_CALLBACK_F(m_set);
+};
+
+FLEXT_LIB_V("difsqr",difsqr_kr);
+
+difsqr_kr::difsqr_kr(int argc,t_atom * argv)
+    :b(0)
+{
+
+    AddInFloat();
+    AddInFloat();
+    AddOutFloat();
+
+    FLEXT_ADDMETHOD(0,m_perform);
+    FLEXT_ADDMETHOD(1,m_set);
+}
+
+void difsqr_kr::m_perform(float f)
+{
+    ToOutFloat(0,sc_difsqr(f,b));
+}
+
+void difsqr_kr::m_set(float f)
+{
+    b=f;
+}