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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 unsigned int random1_nextseed = 1489853723;
random1_nextseed = random1_nextseed * 435898247 + 938284287;
return (random1_nextseed & 0x7fffffff);
}
/* -------------------------- random_tw ------------------------------ */
/* Combination of three tausworth generators. Has parameters for two different generators. Fast and excellent. */
/* Combination of 3 tausworth generators -- assumes 32-bit integers */
static t_class *random_tw_class;
typedef struct _random_tw
{
t_object x_obj;
t_float x_f; // lower limit
t_float x_g; // upper limit
t_int x_s1;
t_int x_s2;
t_int x_s3;
t_int x_mask1;
t_int x_mask2;
t_int x_mask3;
t_int x_shft1;
t_int x_shft2;
t_int x_shft3;
t_int x_k1;
t_int x_k2;
t_int x_k3;
t_int x_q1;
t_int x_q2;
t_int x_q3;
t_int x_p1;
t_int x_p2;
t_int x_p3;
unsigned int x_state; // current seed
} t_random_tw;
void random_tw_rand_seed (t_random_tw *x, unsigned int a, unsigned int b, unsigned int c)
{
static unsigned int zf = 4294967295U;
x->x_shft1 = x->x_k1 - x->x_p1;
x->x_shft2=x->x_k2-x->x_p2;
x->x_shft3=x->x_k3-x->x_p3;
x->x_mask1 = zf << (32-x->x_k1);
x->x_mask2 = zf << (32-x->x_k2);
x->x_mask3 = zf << (32-x->x_k3);
if (a > (unsigned int)(1<<x->x_shft1)) x->x_s1 = a;
if (b > (unsigned int)(1<<x->x_shft2)) x->x_s2 = b;
if (c > (unsigned int)(1<<x->x_shft3)) x->x_s3 = c;
// rand();
}
static void *random_tw_new(t_floatarg f, t_floatarg g)
{
t_random_tw *x = (t_random_tw *)pd_new(random_tw_class);
x->x_f = (f) ? f : 0;
x->x_g = (g) ? g : RAND_MAX;
//post("cxc/randomix.c: lolim: %f - %f, uplim: %f - %f", x->x_f, f, x->x_g, g);
x->x_state = makeseed();
x->x_s1=390451501;
x->x_s2=613566701;
x->x_s3=858993401;
x->x_k1=31;
x->x_k2=29;
x->x_k3=28;
x->x_q1=13;
x->x_q2=2;
x->x_q3=3;
x->x_p1=12;
x->x_p2=4;
x->x_p3=17;
/* x->x_q1=3; */
/* x->x_q2=2; */
/* x->x_q3=13; */
/* x->x_p1=20; */
/* x->x_p2=16; */
/* x->x_p3=7; */
random_tw_rand_seed(x, makeseed(),makeseed(),makeseed());
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("fl1"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("fl2"));
outlet_new(&x->x_obj, &s_float);
return (x);
}
static void random_tw_bang(t_random_tw *x)
{
unsigned int b;
double nval;
static unsigned int zf = 4294967295U;
b = ((x->x_s1 << x->x_q1)^x->x_s1) >> x->x_shft1;
x->x_s1 = ((x->x_s1 & x->x_mask1) << x->x_p1) ^ b;
b = ((x->x_s2 << x->x_q2) ^ x->x_s2) >> x->x_shft2;
x->x_s2 = ((x->x_s2 & x->x_mask2) << x->x_p2) ^ b;
b = ((x->x_s3 << x->x_q3) ^ x->x_s3) >> x->x_shft3;
x->x_s3 = ((x->x_s3 & x->x_mask3) << x->x_p3) ^ b;
nval = (((double)(x->x_s1 ^ x->x_s2 ^ x->x_s3) / (double)(zf) + 0.5) * (double)(x->x_g - x->x_f) + (double)x->x_f);
//nval = ((x->x_state / (double)m) * (double)(x->x_g - x->x_f) + (double)x->x_f);
//post("cxc/randomix.c: current rand: %f", nval);
outlet_float(x->x_obj.ob_outlet, nval);
}
void random_tw_low(t_random_tw *x, t_floatarg f)
{
if(f >= x->x_g) {
post("cxc/randomix.c: lower larger than upper, setting to upper - %f = %f",
SMALLEST_RANGE,
x->x_g - SMALLEST_RANGE);
x->x_f = x->x_g - SMALLEST_RANGE;
} else x->x_f = f;
}
void random_tw_upp(t_random_tw *x, t_floatarg f)
{
if(f <= x->x_f) {
post("cxc/randomix.c: upper smaller than lower, setting to lower + %f = %f",
SMALLEST_RANGE,
x->x_f + SMALLEST_RANGE);
x->x_g = x->x_f + SMALLEST_RANGE;
} else x->x_g = f;
}
static void random_tw_seed(t_random_tw *x, float f, float glob)
{
//x->x_state = f;
// questionable .. dont quite get how this one's seeded ..
random_tw_rand_seed(x, (int)f, (int)(f*0.455777), (int)f);
}
static void random_tw_help(t_random_tw *x)
{
post("RAND_MAX: %d",RAND_MAX);
post("range: %f - %f", x->x_f, x->x_g);
}
void random_tw_setup(void)
{
random_tw_class = class_new(gensym("random_tw"), (t_newmethod)random_tw_new, 0,
sizeof(t_random_tw), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addbang(random_tw_class, random_tw_bang);
class_addmethod(random_tw_class, (t_method)random_tw_low, gensym("fl1"), A_FLOAT, 0);
class_addmethod(random_tw_class, (t_method)random_tw_upp, gensym("fl2"), A_FLOAT, 0);
class_addmethod(random_tw_class, (t_method)random_tw_seed,
gensym("seed"), A_FLOAT, 0);
class_addmethod(random_tw_class, (t_method)random_tw_help,
gensym("help"), 0, 0);
}
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