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/*
(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);
}
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