added [tabread4~~] for higher-precision tabread

svn path=/trunk/externals/zexy/; revision=8914

1 files changed, 164 insertions, 0 deletions

diff --git a/src/tabread4~~.c b/src/tabread4~~.c
new file mode 100644
index 0000000..dbcf4bf
--- /dev/null
+++ b/src/tabread4~~.c
@@ -0,0 +1,164 @@
+/******************************************************
+ *
+ * zexy - implementation file
+ *
+ * copyleft (c) IOhannes m zm-bölnig-A
+ *
+ *   1999:forum::f-bür::umläute:2007-A
+ *
+ *   institute of electronic music and acoustics (iem)
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ *
+ ******************************************************/
+
+/* based on tabread4~ which is part of pd */
+
+#include "zexy.h"
+
+/******************** tabread4~~ ***********************/
+
+
+static t_class *tabread4_tilde_class;
+
+#ifdef Z_USE_WORD_ARRAYS
+# define zarray_t t_word
+# define zarray_getarray garray_getfloatwords
+# define zarray_getfloat(pointer, index) (pointer[index].w_float)
+#else
+# define zarray_t t_float
+# define zarray_getarray garray_getfloatarray
+# define zarray_getfloat(pointer, index) (pointer[index])
+#endif
+
+
+typedef struct _tabread4_tilde
+{
+  t_object x_obj;
+  int x_npoints;
+  zarray_t *x_vec;
+  t_symbol *x_arrayname;
+  t_float x_f;
+} t_tabread4_tilde;
+
+static void *tabread4_tilde_new(t_symbol *s)
+{
+  t_tabread4_tilde *x = (t_tabread4_tilde *)pd_new(tabread4_tilde_class);
+  x->x_arrayname = s;
+  x->x_vec = 0;
+  x->x_npoints=0;
+
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_f = 0;
+  return (x);
+}
+
+static t_int *tabread4_tilde_perform(t_int *w)
+{
+  t_tabread4_tilde *x = (t_tabread4_tilde *)(w[1]);
+  t_sample *in = (t_sample *)(w[2]);
+  t_sample *in1 = (t_sample *)(w[3]);
+  t_sample *out = (t_sample *)(w[4]);
+  int n = (int)(w[5]);    
+  int maxindex;
+  zarray_t *buf = x->x_vec, *wp;
+  int i;
+    
+  maxindex = x->x_npoints - 3;
+  if (!buf){
+    while (n--) *out++ = 0;
+    return (w+6);
+  }
+  //  post("xxx");
+  for (i = 0; i < n; i++)
+    {
+      t_sample in0_s=*in++;
+      t_sample in1_s=*in1++;
+      double findex = (double)in0_s + (double)in1_s;
+      long int index = findex;
+      double frac;
+      t_sample a,  b,  c,  d, cminusb;
+      if (index < 1)
+        index = 1, frac = 0;
+      else if (index > maxindex)
+        index = maxindex, frac = 1;
+      else frac = findex - index;
+
+      //post("%f + %f = %f", in0_s, in1_s, findex);
+      //  post("%f - %f = %d", findex, frac, index);
+
+      wp = buf + index;
+
+      a = zarray_getfloat(wp,-1);
+      b = zarray_getfloat(wp, 0);
+      c = zarray_getfloat(wp, 1);
+      d = zarray_getfloat(wp, 2);
+
+      cminusb = c-b;
+      *out++ = b + frac * (
+                           cminusb - 0.1666667f * (1.-frac) * (
+                                                               (d - a - 3.0f * cminusb) * frac + (d + 2.0f*a - 3.0f*b)
+                                                               )
+                           );
+    }
+  return (w+6);
+}
+
+static void tabread4_tilde_set(t_tabread4_tilde *x, t_symbol *s)
+{
+  t_garray *a;
+    
+  x->x_arrayname = s;
+  if (!(a = (t_garray *)pd_findbyclass(x->x_arrayname, garray_class)))
+    {
+      if (*s->s_name)
+        pd_error(x, "tabread4~~: %s: no such array", x->x_arrayname->s_name);
+      x->x_vec = 0;
+    }
+  else if (!zarray_getarray(a, &x->x_npoints, &x->x_vec))
+    {
+      pd_error(x, "%s: bad template for tabread4~~", x->x_arrayname->s_name);
+      x->x_vec = 0;
+    }
+  else garray_usedindsp(a);
+}
+
+static void tabread4_tilde_dsp(t_tabread4_tilde *x, t_signal **sp)
+{
+  tabread4_tilde_set(x, x->x_arrayname);
+
+  dsp_add(tabread4_tilde_perform, 5, x,
+          sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n);
+
+}
+
+static void tabread4_tilde_free(t_tabread4_tilde *x)
+{
+}
+
+void tabread4_tilde_tilde_setup(void)
+{
+  tabread4_tilde_class = class_new(gensym("tabread4~~"),
+                                   (t_newmethod)tabread4_tilde_new, (t_method)tabread4_tilde_free,
+                                   sizeof(t_tabread4_tilde), 0, A_DEFSYM, 0);
+  CLASS_MAINSIGNALIN(tabread4_tilde_class, t_tabread4_tilde, x_f);
+  class_addmethod(tabread4_tilde_class, (t_method)tabread4_tilde_dsp,
+                  gensym("dsp"), 0);
+  class_addmethod(tabread4_tilde_class, (t_method)tabread4_tilde_set,
+                  gensym("set"), A_SYMBOL, 0);
+
+  zexy_register("tabread4~~");
+}
+
+void setup_tabread40x7e_tilde(void)
+{
+  tabread4_tilde_tilde_setup();
+}
+
+void setup_tabread40x7e0x7e(void)
+{
+  tabread4_tilde_tilde_setup();
+}