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/* ------------------------------- urn -------------------------------------- */
/* */
/* urn - urn selection model (random numbers without repetition). */
/* Written by Olaf Matthes (olaf.matthes@gmx.de) */
/* Based on code found in Dodge/Jerse "Computer Music" */
/* Get source at http://www.akustische-kunst.org/puredata/maxlib/ */
/* */
/* 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, write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* */
/* Based on PureData by Miller Puckette and others. */
/* */
/* ---------------------------------------------------------------------------- */
#include "m_pd.h"
#include <stdlib.h>
#include <time.h>
#include <math.h>
static char *version = "urn v0.1, urn selection model\n"
" written by Olaf Matthes <olaf.matthes@gmx.de>";
/* -------------------------- urn ------------------------------ */
static t_class *urn_class;
typedef struct _urn
{
t_object x_obj;
t_outlet *x_numberout;
t_outlet *x_notify;
t_float x_f; /* number of numbers in urn */
t_int x_numbers; /* numbers left in urn */
t_int *x_selected;
unsigned int x_state;
} t_urn;
static int makeseed(void)
{
static unsigned int random_nextseed = 1489853723;
random_nextseed = random_nextseed * 435898247 + 938284287;
return (random_nextseed & 0x7fffffff);
}
static void *urn_new(t_floatarg f)
{
t_urn *x = (t_urn *)pd_new(urn_class);
srand( (unsigned)time( NULL ) );
x->x_numbers = x->x_f = f;
if(x->x_f < 0)x->x_f = 0;
x->x_selected = getbytes(((t_int)x->x_f+1)*sizeof(t_int));
x->x_state = makeseed();
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("f"));
x->x_numberout = outlet_new(&x->x_obj, &s_float);
x->x_notify = outlet_new(&x->x_obj, &s_bang);
return (x);
}
/* set new size of urn */
static void urn_f(t_urn *x, t_floatarg f)
{
int i;
if(f < 0)
f = 0;
freebytes(x->x_selected, ((t_int)x->x_f+1)*sizeof(t_int));
x->x_numbers = x->x_f = f;
x->x_selected = getbytes(((t_int)x->x_f+1)*sizeof(t_int));
for(i = 0; i <= x->x_f; i++)
x->x_selected[i] = 0;
}
/* clear (refill) urn */
static void urn_clear(t_urn *x)
{
int i;
x->x_numbers = x->x_f;
for(i = 0; i <= x->x_f; i++)
x->x_selected[i] = 0;
}
static void urn_seed(t_urn *x, float f, float glob)
{
x->x_state = f;
}
/* choose from urn */
static void urn_bang(t_urn *x)
{
int n = x->x_f, nval;
int range = (n < 1 ? 1 : n);
unsigned int randval = x->x_state;
if(x->x_numbers == 0)
goto notify;
do
{
x->x_state = randval = randval * 472940017 + 832416023;
nval = ((double)range) * ((double)randval)
* (1./4294967296.);
if (nval >= range) nval = range-1;
}
while(x->x_selected[nval]);
x->x_selected[nval] = 1;
outlet_float(x->x_numberout, nval);
if(--x->x_numbers == 0) /* urn is now empty */
goto notify;
return;
notify:
outlet_bang(x->x_notify);
}
#ifndef MAXLIB
void urn_setup(void)
{
urn_class = class_new(gensym("urn"), (t_newmethod)urn_new, 0,
sizeof(t_urn), 0, A_DEFFLOAT, 0);
#else
void maxlib_urn_setup(void)
{
urn_class = class_new(gensym("maxlib_urn"), (t_newmethod)urn_new, 0,
sizeof(t_urn), 0, A_DEFFLOAT, 0);
class_addcreator((t_newmethod)urn_new, gensym("urn"), A_DEFFLOAT, 0);
#endif
class_addbang(urn_class, urn_bang);
class_addmethod(urn_class, (t_method)urn_f, gensym("f"), A_FLOAT, 0);
class_addmethod(urn_class, (t_method)urn_clear, gensym("clear"), 0);
class_addmethod(urn_class, (t_method)urn_seed, gensym("seed"), A_FLOAT, 0);
#ifndef MAXLIB
post(version);
#else
class_sethelpsymbol(urn_class, gensym("maxlib/urn-help.pd"));
#endif
}
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