1 files changed, 115 insertions, 0 deletions
diff --git a/random1~.c b/random1~.c
new file mode 100644
index 0000000..0c03fd7
--- /dev/null
+++ b/random1~.c
@@ -0,0 +1,115 @@
+/*
+  (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_random1(int);
+
+static int makeseed(void)
+{
+    static unsigned int random1_nextseed = 1489853723;
+    random1_nextseed = random1_nextseed * 435898247 + 938284287;
+    return (random1_nextseed & 0x7fffffff);
+}
+
+/* -------------------------- random1 ------------------------------ */
+/* linear congruential generator.  Generator x[n+1] = a * x[n] mod m */
+static int rand_random1(seed)
+{
+  int state;
+  
+  //unsigned int a = 1588635695, m = 4294967291U, q = 2, r = 1117695901;
+  //  unsigned int a = 1588635695, m = (RAND_MAX * 2), q = 2, r = 1117695901;
+  
+  /* static unsigned int a = 1223106847, m = 4294967291U, q = 3, r = 625646750;*/
+  /* static unsigned int a = 279470273, m = 4294967291U, q = 15, r = 102913196;*/
+  //static unsigned int a = 1583458089, m = 2147483647, q = 1, r = 564025558;
+  static unsigned int a = 784588716, m = 2147483647, q = 2, r = 578306215;
+  /* static unsigned int a = 16807, m = 2147483647, q = 127773, r = 2836;      */
+  /* static unsigned int a = 950706376, m = 2147483647, q = 2, r = 246070895;  */
+  
+  //state = (seed) ? seed : makeseed();
+  state = seed;
+  state = a*(state % q) - r*(state / q);
+  return (state);
+}
+
+/* -------------------------- random1 ------------------------------ */
+/* linear congruential generator.  Generator x[n+1] = a * x[n] mod m */
+
+static t_class *random1_class;
+
+typedef struct _random1
+{
+  t_object x_obj;
+  t_float x_f; // lower limit
+  t_float x_g; // upper limit
+  unsigned int x_state; // current seed
+} t_random1;
+
+/* -------------------------- random1 ------------------------------ */
+/* linear congruential generator.  Generator x[n+1] = a * x[n] mod m */
+/* signal version */
+
+static t_class *random1_tilde_class;
+
+typedef struct _random1_tilde
+{
+  t_object x_obj;
+  unsigned int x_state; // current seed
+} t_random1_tilde;
+
+static void *random1_tilde_new()
+{
+    t_random1_tilde *x = (t_random1_tilde *)pd_new(random1_tilde_class);
+    x->x_state = makeseed();
+    outlet_new(&x->x_obj, gensym("signal"));
+    return (x);
+}
+
+static void random1_tilde_seed(t_random1_tilde *x, float f, float glob)
+{
+    x->x_state = f;
+}
+
+static t_int *random1_tilde_perform(t_int *w)
+{
+  t_random1_tilde *x = (t_random1_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_random1(x->x_state);
+    *out++ = (t_float)x->x_state / RAND_MAX - 1;
+  }
+
+  return (w+4);
+}
+
+static void random1_tilde_dsp(t_random1_tilde *x, t_signal **sp)
+{
+  dsp_add(random1_tilde_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
+}
+
+void random1_tilde_setup(void)
+{
+  random1_tilde_class = class_new(gensym("random1~"),
+				  (t_newmethod)random1_tilde_new,
+				  0, sizeof(t_random1_tilde), 0, 0);
+  class_addmethod(random1_tilde_class, (t_method)random1_tilde_seed,gensym("seed"), A_FLOAT, 0);
+  class_addmethod(random1_tilde_class, (t_method)random1_tilde_dsp, gensym("dsp"), 0);
+}