From d962ed33f6b5fe3040cfbd798f63ab9aa36d1f9e Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <eighthave@users.sourceforge.net>
Date: Thu, 25 May 2006 16:40:19 +0000
Subject: renamed files to match their class names

svn path=/trunk/externals/creb/; revision=5127
---
 modules/cheby~.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 modules/cheby~.c

(limited to 'modules/cheby~.c')

diff --git a/modules/cheby~.c b/modules/cheby~.c
new file mode 100644
index 0000000..6774028
--- /dev/null
+++ b/modules/cheby~.c
@@ -0,0 +1,138 @@
+/*
+ *   cheby.c  - chebyshev polynomial evaluation 
+ *   Copyright (c) 2000-2003 by Tom Schouten
+ *
+ *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "m_pd.h"
+#include <math.h>
+
+
+#define MAX_ORDER 1024
+#define DEFAULT_ORDER 4
+
+typedef struct chebyctl
+{
+  t_float c_gain[MAX_ORDER];
+  t_int c_order;
+} t_chebyctl;
+
+typedef struct cheby
+{
+  t_object x_obj;
+  t_float x_f;
+  t_chebyctl x_ctl;
+} t_cheby;
+
+static void cheby_bang(t_cheby *x)
+{
+
+}
+
+static void cheby_coef(t_cheby *x, t_floatarg coef, t_floatarg f)
+{
+  int i = (int)coef;
+  if ((i > 0) && (i < x->x_ctl.c_order + 1)){
+    x->x_ctl.c_gain[i-1] = f;
+  /*   post("cheby: harmonic %d set to %f", i, f); */
+  }
+}
+
+
+static t_int *cheby_perform(t_int *w)
+{
+
+
+  t_float *in    = (float *)(w[3]);
+  t_float *out    = (float *)(w[4]);
+  t_chebyctl *ctl  = (t_chebyctl *)(w[1]);
+  t_float *gain  = ctl->c_gain;
+  t_int i;
+  t_int n = (t_int)(w[2]), k;
+  t_float x,y,t1,t2,t,acc;
+
+    
+  for (i = 0; i < n; i++) 
+    {
+      x = *in++;
+      
+      gain = ctl->c_gain;
+      t2 = 1;                      /* T_0 */
+      t1 = x;                      /* T_1 */
+      
+      acc = *gain++ * x;           /* a_1 T_1 */
+      for (k=2; k<=ctl->c_order; k++){
+	t = 2*x*t1 - t2;           /* T_k = 2 x T_{k-1} - T_{k-2} */
+	acc += *gain++ * t;        /* a_k T_k */
+	t2 = t1;
+	t1 = t;
+      }
+
+      *out++ = acc;
+      
+    }
+  
+    
+  return (w+5);
+}
+
+static void cheby_dsp(t_cheby *x, t_signal **sp)
+{
+    dsp_add(cheby_perform, 4, &x->x_ctl, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
+
+}                                  
+static void cheby_free(void)
+{
+
+}
+
+t_class *cheby_class;
+
+static void *cheby_new(t_floatarg order_f)
+{
+  int i;
+  int order = (int)order_f;
+
+    t_cheby *x = (t_cheby *)pd_new(cheby_class);
+    outlet_new(&x->x_obj, gensym("signal")); 
+
+    if (order < 1)         order = DEFAULT_ORDER;  /* default */
+    if (order > MAX_ORDER) order = MAX_ORDER;      /* maximum */
+
+
+    //post("cheby: order = %d", order);
+
+    x->x_ctl.c_order = order;
+    cheby_coef(x, 1, 1);
+    for (i=2; i<order+1; i++){
+      cheby_coef(x, 0, i);
+    }
+
+    return (void *)x;
+}
+
+void cheby_tilde_setup(void)
+{
+  //post("cheby~ v0.1");
+    cheby_class = class_new(gensym("cheby~"), (t_newmethod)cheby_new,
+    	(t_method)cheby_free, sizeof(t_cheby), 0, A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(cheby_class, t_cheby, x_f); 
+    class_addmethod(cheby_class, (t_method)cheby_bang, gensym("bang"), 0);
+    class_addmethod(cheby_class, (t_method)cheby_dsp, gensym("dsp"), 0); 
+    class_addmethod(cheby_class, (t_method)cheby_coef, gensym("coef"), A_DEFFLOAT, A_DEFFLOAT, 0); 
+
+}
+
-- 
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