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

   1 #include "../src/m_pd.h"
   2 #include <../src/m_fixed.h>
   3
   4
   5 static t_class *noise_class;
   6
   7 typedef struct _noise
   8 {
   9     t_object x_obj;
  10     int x_val;
  11 } t_noise;
  12
  13 static void *noise_new(void)
  14 {
  15     t_noise *x = (t_noise *)pd_new(noise_class);
  16     static int init = 307;
  17     x->x_val = (init *= 1319);
  18     outlet_new(&x->x_obj, gensym("signal"));
  19     return (x);
  20 }
  21
  22 static t_int *noise_perform(t_int *w)
  23 {
  24     t_sample *out = (t_sample *)(w[1]);
  25     int *vp = (int *)(w[2]);
  26     int n = (int)(w[3]);
  27     int val = *vp;
  28     while (n--)
  29     {
  30 #ifndef FIXEDPOINT
  31          *out++ = ((t_sample)((val & 0x7fffffff) - 0x40000000)) *
  32              (t_sample)(1.0 / 0x40000000);
  33 #else
  34          *out++=val>>(32-fix1);
  35 #endif
  36          val = val * 435898247 + 382842987;
  37
  38     }
  39     *vp = val;
  40     return (w+4);
  41 }
  42
  43 static void noise_dsp(t_noise *x, t_signal **sp)
  44 {
  45     dsp_add(noise_perform, 3, sp[0]->s_vec, &x->x_val, sp[0]->s_n);
  46 }
  47
  48 void noise_tilde_setup(void)
  49 {
  50     noise_class = class_new(gensym("noise~"), (t_newmethod)noise_new, 0,
  51         sizeof(t_noise), 0, 0);
  52     class_addmethod(noise_class, (t_method)noise_dsp, gensym("dsp"), 0);
  53 }
  54