Merge branchesHEADsvn2git-headmaster

- abstractions/tb
- externals/tb

1 files changed, 167 insertions, 0 deletions

diff --git a/sc4pd/source/TwoPole.cpp b/sc4pd/source/TwoPole.cpp
new file mode 100644
index 0000000..b37d17f
--- /dev/null
+++ b/sc4pd/source/TwoPole.cpp
@@ -0,0 +1,167 @@
+/* sc4pd 
+   TwoPole~
+
+   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: VA: Insight
+   
+*/
+
+#include "sc4pd.hpp"
+
+/* ------------------------ TwoPole~ -------------------------------*/
+
+class TwoPole_ar:
+    public sc4pd_dsp
+{
+    FLEXT_HEADER(TwoPole_ar,sc4pd_dsp);
+    
+public:
+    TwoPole_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)
+    {
+	mRadiansPerSample = sc_radianspersample();
+	mFilterSlope = sc_filterslope();
+	mFilterLoops = sc_filterloops();
+	mFilterRemain = sc_filterremain();
+    }
+
+    void m_set_freq(float f)
+    {
+	m_freq=f;
+	changed = true;
+    }
+
+    void m_set_radius(float f)
+    {
+	m_reson=f;
+	changed = true;
+    }
+    
+    
+private:
+    float m_b1, m_b2, m_y1, m_y2, m_freq, m_reson;
+    bool changed;
+    float mRadiansPerSample, mFilterSlope;
+    int mFilterLoops, mFilterRemain; 
+    
+    FLEXT_CALLBACK_F(m_set_freq);
+    FLEXT_CALLBACK_F(m_set_radius);
+};
+
+FLEXT_LIB_DSP_V("TwoPole~",TwoPole_ar);
+
+TwoPole_ar::TwoPole_ar(int argc, t_atom *argv)
+{
+    FLEXT_ADDMETHOD_(0,"kfreq",m_set_freq);
+    FLEXT_ADDMETHOD_(0,"kradius",m_set_radius);
+
+    //parse arguments
+    AtomList Args(argc,argv);
+    
+    m_freq = sc_getfloatarg(Args,0);
+    m_reson = sc_getfloatarg(Args,1);
+    changed = false;
+    
+    AddOutSignal();
+    
+    m_b1 = 0.f;
+    m_b2 = 0.f;
+    m_y1 = 0.f;
+    m_y2 = 0.f;
+}
+
+void TwoPole_ar::m_signal(int n, t_sample *const *in, 
+			  t_sample *const *out)
+{
+    t_sample *nin = *in;
+    t_sample *nout = *out;
+    
+    float y0;
+    float y1 = m_y1;
+    float y2 = m_y2;
+
+    if (changed)
+    {
+	float b1 = m_b1;
+	float b2 = m_b2;
+	float b1_next = 2.f * m_reson * cos(m_freq * mRadiansPerSample);
+	float b2_next = -(m_reson * m_reson);
+	float b1_slope = (b1_next - b1) * mFilterSlope;
+	float b2_slope = (b2_next - b2) * mFilterSlope;
+	
+	for (int i = 0; i!= mFilterLoops;++i)
+	{
+	    ZXP(nout) = y0 = ZXP(nin) + b1 * y1 + b2 * y2;
+	    ZXP(nout) = y2 = ZXP(nin) + b1 * y0 + b2 * y1;
+	    ZXP(nout) = y1 = ZXP(nin) + b1 * y2 + b2 * y0;
+	    
+	    b1 += b1_slope; 
+	    b2 += b2_slope;
+	}
+	
+	for (int i = 0; i!= mFilterRemain;++i)
+	{
+	    ZXP(nout) = y0 = ZXP(nin) + b1 * y1 + b2 * y2;
+	    y2 = y1; 
+	    y1 = y0;
+	}
+
+	m_b1 = b1;
+	m_b2 = b2;
+	changed = false;
+    }
+    else
+    {
+	float b1 = m_b1;
+	float b2 = m_b2;
+
+	for (int i = 0; i!= mFilterLoops;++i)
+	{
+	    ZXP(nout) = y0 = ZXP(nin) + b1 * y1 + b2 * y2;
+	    ZXP(nout) = y2 = ZXP(nin) + b1 * y0 + b2 * y1;
+	    ZXP(nout) = y1 = ZXP(nin) + b1 * y2 + b2 * y0;
+	}
+	for (int i = 0; i!= mFilterRemain;++i)
+	{
+	    ZXP(nout) = y0 = ZXP(nin) + b1 * y1 + b2 * y2;
+	    y2 = y1; 
+	    y1 = y0;
+	}
+    }
+    m_y1 = zapgremlins(y1);
+    m_y2 = zapgremlins(y2);
+}
+
+/* no control rate two pole filter */