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/*
* urn : "generate random numbers without duplicates" (very max-like)
*
* (c) 1999-2011 IOhannes m zmölnig, forum::für::umläute, institute of electronic music and acoustics (iem)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "zexy.h"
/* ------------------------- urn ------------------------------- */
static t_class *urn_class;
typedef struct _urn
{
t_object x_obj;
unsigned int x_seed; /* the seed of the generator */
unsigned int x_range; /* max. random-number + 1 */
unsigned int x_count; /* how many random numbers have we generated ? */
char *x_state; /* has this number been generated already ? */
t_outlet *x_floatout, *x_bangout;
char x_noauto;
} t_urn;
static int makeseed(void)
{
static unsigned int random_nextseed = 1489853723;
random_nextseed = random_nextseed * 435898247 + 938284287;
return (random_nextseed & 0x7fffffff);
}
static void makestate(t_urn *x, unsigned int newrange)
{
if (x->x_range == newrange)return;
if (x->x_range && x->x_state) {
freebytes(x->x_state, sizeof(char)*x->x_range);
x->x_state=0;
}
x->x_range=newrange;
x->x_state=getbytes(sizeof(char)*x->x_range);
}
static void urn_clear(t_urn *x)
{
unsigned int i=x->x_range;
char *dummy=x->x_state;
if (!dummy || !i)return;
while(i--)*dummy++=0;
x->x_count=0;
}
static void urn_bang(t_urn *x)
{
unsigned int range = (x->x_range<1?1:x->x_range);
unsigned int randval = x->x_seed;
unsigned int nval=0, used=1;
if (x->x_count>=range){
outlet_bang(x->x_bangout);
if (x->x_noauto)return;
urn_clear(x);
}
while (used) {
randval = randval * 472940017 + 832416023;
nval = ((double)range) * ((double)randval)
* (1./4294967296.);
if (nval >= range) nval = range-1;
used=x->x_state[nval];
}
x->x_count++;
x->x_state[nval]=1;
x->x_seed = randval;
outlet_float(x->x_floatout, nval);
}
static void urn_flt2(t_urn *x, t_float f)
{
unsigned int range = (f<1)?1:f;
makestate(x, range);
urn_clear(x);
}
static void urn_seed(t_urn *x, t_float f)
{
x->x_seed = f;
}
static void *urn_new(t_symbol* UNUSED(s), int argc, t_atom *argv)
{
t_urn *x = (t_urn *)pd_new(urn_class);
t_float f=0.;
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym(""));
x->x_floatout=outlet_new(&x->x_obj, gensym("float"));
x->x_bangout =outlet_new(&x->x_obj, gensym("bang"));
x->x_seed = makeseed();
x->x_noauto = 0;
while(argc--){
if (argv->a_type==A_SYMBOL) {
if (atom_getsymbol(argv)==gensym("no_auto")) {
x->x_noauto=1;
}
} else f = atom_getfloat(argv);
argv++;
}
if (f<1.0)f=1.0;
makestate(x, f);
x->x_range = f;
urn_clear(x);
return (x);
}
static void urn_help(t_urn*x)
{
post("\n"HEARTSYMBOL" urn\t\t:: generate randum numbers without repetition");
}
void urn_setup(void)
{
urn_class = class_new(gensym("urn"), (t_newmethod)urn_new,
0, sizeof(t_urn), 0, A_GIMME, 0);
class_addbang (urn_class, urn_bang);
class_addmethod(urn_class, (t_method)urn_clear, gensym("clear"), 0);
class_addmethod(urn_class, (t_method)urn_flt2, gensym(""), A_DEFFLOAT, 0);
class_addmethod(urn_class, (t_method)urn_seed, gensym("seed"), A_DEFFLOAT, 0);
class_addmethod(urn_class, (t_method)urn_help, gensym("help"), A_NULL);
zexy_register("urn");
}
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