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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_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(int 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);
}
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