1 files changed, 100 insertions, 0 deletions
diff --git a/random_fl~.c b/random_fl~.c
new file mode 100644
index 0000000..83b4347
--- /dev/null
+++ b/random_fl~.c
@@ -0,0 +1,100 @@
+/*
+  (c) 2002:cxc@web.fm
+  randomix: various PRNG's
+  code taken from: http://remus.rutgers.edu/%7Erhoads/Code/code.html
+  let's check it out
+ */
+
+#include <m_pd.h>
+#include <stdlib.h>
+#include <math.h>
+
+#define SMALLEST_RANGE .0001
+
+#ifndef RAND_MAX
+#define RAND_MAX 2147483647
+#endif
+
+static int makeseed(void);
+static int rand_random_fl(int);
+
+static int makeseed(void)
+{
+    static unsigned int random1_nextseed = 1489853723;
+    random1_nextseed = random1_nextseed * 435898247 + 938284287;
+    return (random1_nextseed & 0x7fffffff);
+}
+
+static int rand_random_fl(seed) {
+  int q;
+  double state;
+
+  /* The following parameters are recommended settings based on research
+     uncomment the one you want. */
+  
+  double a = 1389796, m = RAND_MAX;  
+  /* static double a = 950975,  m = 2147483647;  */
+  /* static double a = 3467255, m = 21474836472; */
+  /* static double a = 657618,  m = 4294967291;  */
+  /* static double a = 93167,   m = 4294967291;  */
+  /* static double a = 1345659, m = 4294967291;  */
+
+  state = seed;
+  state *= a;
+  q = state / m;
+  state -= q*m;
+  return state;
+}
+
+/* ------------------------------- random_fl signal version -------------------- */
+
+static t_class *random_fl_tilde_class;
+
+typedef struct _random_fl_tilde
+{
+  t_object x_obj;
+  unsigned int x_state; // current seed
+} t_random_fl_tilde;
+
+static void *random_fl_tilde_new()
+{
+    t_random_fl_tilde *x = (t_random_fl_tilde *)pd_new(random_fl_tilde_class);
+    x->x_state = makeseed();
+    outlet_new(&x->x_obj, gensym("signal"));
+    return (x);
+}
+
+static void random_fl_tilde_seed(t_random_fl_tilde *x, float f, float glob)
+{
+  x->x_state = f;
+}
+
+static t_int *random_fl_tilde_perform(t_int *w)
+{
+  t_random_fl_tilde *x = (t_random_fl_tilde *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  int n = (int)(w[3]);
+
+  while (n--) {
+    // generate new noise sample
+    x->x_state = rand_random_fl(x->x_state);
+    *out++ = (t_float)x->x_state / RAND_MAX * 2 - 1;
+  }
+
+  return (w+4);
+}
+
+static void random_fl_tilde_dsp(t_random_fl_tilde *x, t_signal **sp)
+{
+  dsp_add(random_fl_tilde_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
+}
+
+void random_fl_tilde_setup(void)
+{
+  random_fl_tilde_class = class_new(gensym("random_fl~"),
+				    (t_newmethod)random_fl_tilde_new, 0,
+				    sizeof(t_random_fl_tilde), 0, 0);
+  class_addmethod(random_fl_tilde_class, (t_method)random_fl_tilde_seed,
+		  gensym("seed"), A_FLOAT, 0);
+  class_addmethod(random_fl_tilde_class, (t_method)random_fl_tilde_dsp, gensym("dsp"), 0);
+}