1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/* ------------------------------- 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);
}
void urn_setup(void)
{
urn_class = class_new(gensym("urn"), (t_newmethod)urn_new, 0,
sizeof(t_urn), 0, A_DEFFLOAT, 0);
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);
class_sethelpsymbol(urn_class, gensym("help-urn.pd"));
#else
class_sethelpsymbol(urn_class, gensym("maxlib/help-urn.pd"));
#endif
}
|
