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+/* sc4pd
+ Lag2~, Lag2
+
+ 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: DKV Trio: Baraka
+
+*/
+
+#include "sc4pd.hpp"
+
+/* ------------------------ Lag2~ -----------------------------*/
+
+class Lag2_ar
+ :public sc4pd_dsp
+{
+ FLEXT_HEADER(Lag2_ar,sc4pd_dsp);
+
+public:
+ Lag2_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);
+ void m_set(float f);
+
+private:
+ FLEXT_CALLBACK_F(m_set);
+ float m_b1, n_b1;
+ float m_y1a, m_y1b;
+ float m_lag;
+ bool changed;
+};
+
+FLEXT_LIB_DSP_V("Lag2~",Lag2_ar);
+
+Lag2_ar::Lag2_ar(int argc,t_atom * argv)
+{
+ FLEXT_ADDMETHOD_(0,"lagTime",m_set);
+
+ AtomList Args(argc,argv);
+
+ m_lag = sc_getfloatarg(Args,0);
+
+ AddOutSignal();
+
+ m_b1 = 0.f;
+ m_y1a = 0.f;
+ m_y1b = 0.f;
+}
+
+void Lag2_ar::m_dsp(int n, t_sample *const *in,
+ t_sample *const *out)
+{
+ changed = false;
+ m_b1 = m_lag == 0.f ? 0.f : exp(log001 / (m_lag * Samplerate()));
+}
+
+void Lag2_ar::m_signal(int n, t_sample *const *in,
+ t_sample *const *out)
+{
+ t_sample *nout = *out;
+ t_sample *nin = *in;
+
+ float y1a = m_y1a;
+ float y1b = m_y1b;
+ float b1 = m_b1;
+
+ if (changed)
+ {
+ float b1_slope = CALCSLOPE(m_b1, n_b1);
+ m_b1 = n_b1;
+ for (int i = 0; i!= n;++i)
+ {
+ float y0a = ZXP(nin);
+ y1a = y0a + b1 * (y1a - y0a);
+ y1b = y1a + b1 * (y1b - y1a);
+ ZXP(nout) = y1b;
+ b1 += b1_slope;
+ }
+ changed = false;
+ }
+ else
+ {
+ for (int i = 0; i!= n;++i)
+ {
+ float y0a = ZXP(nin);
+ y1a = y0a + b1 * (y1a - y0a);
+ y1b = y1a + b1 * (y1b - y1a);
+ ZXP(nout) = y1b;
+ }
+ }
+ m_y1a = zapgremlins(y1a);
+ m_y1b = zapgremlins(y1b);
+}
+
+void Lag2_ar::m_set(float f)
+{
+ m_lag = f;
+ n_b1 = m_lag == 0.f ? 0.f : exp(log001 / (m_lag * Samplerate()));
+ changed = true;
+}
+
+/* todo: does a control rate Lag2 make sense? */