1 /* Goom Project
2 * Copyright (C) <2003> iOS-Software
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19 #include "goom_tools.h"
20 #include <stdlib.h>
21
22 GoomRandom *
goom_random_init(int i)23 goom_random_init (int i)
24 {
25 GoomRandom *grandom = (GoomRandom *) malloc (sizeof (GoomRandom));
26
27 srand (i);
28 grandom->pos = 1;
29 goom_random_update_array (grandom, GOOM_NB_RAND);
30 return grandom;
31 }
32
33 void
goom_random_free(GoomRandom * grandom)34 goom_random_free (GoomRandom * grandom)
35 {
36 free (grandom);
37 }
38
39 void
goom_random_update_array(GoomRandom * grandom,int numberOfValuesToChange)40 goom_random_update_array (GoomRandom * grandom, int numberOfValuesToChange)
41 {
42 while (numberOfValuesToChange > 0) {
43 #if RAND_MAX < 0x10000
44 grandom->array[grandom->pos++] = ((rand () << 16) + rand ()) / 127;
45 #else
46 grandom->array[grandom->pos++] = rand () / 127;
47 #endif
48 numberOfValuesToChange--;
49 }
50 }
51