apps/plugins/pdbox/PDa/intern/cos~.c

   1
   2 #include "../src/m_pd.h"
   3 #include <../src/m_fixed.h>
   4 #include "cos_table.h"
   5
   6 /* ------------------------ cos~ ----------------------------- */
   7 #define FRAC ((1<<(fix1-ILOGCOSTABSIZE))-1)
   8
   9 static t_class *cos_class;
  10
  11 typedef struct _cos
  12 {
  13     t_object x_obj;
  14     float x_f;
  15 } t_cos;
  16
  17 static void *cos_new(void)
  18 {
  19     t_cos *x = (t_cos *)pd_new(cos_class);
  20     outlet_new(&x->x_obj, gensym("signal"));
  21     x->x_f = 0;
  22     return (x);
  23 }
  24
  25 static t_int *cos_perform(t_int *w)
  26 {
  27     t_sample *in = (t_sample *)(w[1]);
  28     t_sample *out = (t_sample *)(w[2]);
  29     int n = (int)(w[3]);
  30     t_sample *tab = cos_table;
  31     int off;
  32     int frac;
  33     unsigned int phase;
  34
  35     while (n--) {
  36          phase = *in++;
  37          phase &= ((1<<fix1)-1);
  38          off =  fixtoi((long long)phase<<ILOGCOSTABSIZE);
  39
  40          frac = phase&(itofix(1)-1);
  41          *out = mult(*(tab + off),itofix(1) - frac) +
  42               mult(*(tab + off + 1),frac);
  43          out++;
  44     }
  45     return (w+4);
  46 }
  47
  48 static void cos_dsp(t_cos *x, t_signal **sp)
  49 {
  50 #ifdef ROCKBOX
  51     (void) x;
  52 #endif
  53     dsp_add(cos_perform, 3, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
  54 }
  55
  56
  57 void cos_tilde_setup(void)
  58 {
  59     cos_class = class_new(gensym("cos~"), (t_newmethod)cos_new, 0,
  60         sizeof(t_cos), 0, A_DEFFLOAT, 0);
  61     CLASS_MAINSIGNALIN(cos_class, t_cos, x_f);
  62     class_addmethod(cos_class, (t_method)cos_dsp, gensym("dsp"), 0);
  63     class_sethelpsymbol(cos_class, gensym("osc~-help.pd"));
  64 }
  65