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+/* sc4pd
+ HPZ2~
+
+ 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: William Parker: Compassion Seizes Bed-Stuy
+
+*/
+
+#include "sc4pd.hpp"
+
+/* ------------------------ HPZ2~ -------------------------------*/
+
+class HPZ2_ar:
+ public sc4pd_dsp
+{
+ FLEXT_HEADER(HPZ2_ar,sc4pd_dsp);
+
+public:
+ HPZ2_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)
+ {
+ mFilterLoops=sc_filterloops();
+ mFilterRemain=sc_filterremain();
+ }
+
+private:
+ float m_x1, m_x2;
+ int mFilterLoops, mFilterRemain;
+};
+
+FLEXT_LIB_DSP_V("HPZ2~",HPZ2_ar);
+
+HPZ2_ar::HPZ2_ar(int argc, t_atom *argv)
+{
+ AddOutSignal();
+
+ m_x1=0;
+ m_x2=0;
+}
+
+void HPZ2_ar::m_signal(int n, t_sample *const *in,
+ t_sample *const *out)
+{
+ t_sample *nin = *in;
+ t_sample *nout = *out;
+
+ float x0;
+ float x1 = m_x1;
+ float x2 = m_x2;
+
+ for (int i = 0; i!=mFilterLoops ;++i)
+ {
+ x0 = ZXP(nin);
+ ZXP(nout) = (x0 - 2.f * x1 + x2) * 0.25f;
+ x2 = ZXP(nin);
+ ZXP(nout) = (x2 - 2.f * x0 + x1) * 0.25f;
+ x1 = ZXP(nin);
+ ZXP(nout) = (x1 - 2.f * x2 + x0) * 0.25f;
+ }
+
+ for (int i = 0; i!= mFilterRemain;++i)
+ {
+ x0 = ZXP(nin);
+ ZXP(nout) = (x0 - 2.f * x1 + x2) * 0.25f;
+ x2 = x1;
+ x1 = x0;
+ }
+ m_x1 = x1;
+ m_x2 = x2;
+}
+
+/* ------------------------ HPZ2 -------------------------------*/
+
+class HPZ2_kr:
+ public flext_base
+{
+ FLEXT_HEADER(HPZ2_kr,flext_base);
+
+public:
+ HPZ2_kr(int argc, t_atom *argv);
+
+protected:
+ void m_perform (float f);
+
+private:
+ float m_x1;
+ float m_x2;
+ FLEXT_CALLBACK_F(m_perform);
+};
+
+FLEXT_LIB_V("HPZ2",HPZ2_kr);
+
+HPZ2_kr::HPZ2_kr(int argc, t_atom *argv)
+{
+ FLEXT_ADDMETHOD(0,m_perform);
+
+ AddOutFloat();
+
+ m_x2 = m_x1 = 0;
+}
+
+void HPZ2_kr::m_perform(float f)
+{
+ ToOutFloat(0,(f - 2.f * m_x1 + m_x2) * 0.25f);
+ m_x2=m_x1;
+ m_x1=f;
+}
+