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 #ifndef _GOOMTOOLS_H
20 #define _GOOMTOOLS_H
21
22 #include "goom_config.h"
23
24 /**
25 * Random number generator wrapper for faster random number.
26 */
27
28 #define GOOM_NB_RAND 0x10000
29
30 typedef struct _GOOM_RANDOM {
31 int array[GOOM_NB_RAND];
32 unsigned short pos;
33 } GoomRandom;
34
35 GoomRandom *goom_random_init(int i);
36 void goom_random_free(GoomRandom *grandom);
37
goom_random(GoomRandom * grandom)38 inline static int goom_random(GoomRandom *grandom) {
39
40 grandom->pos++; /* works because pos is an unsigned short */
41 return grandom->array[grandom->pos];
42 }
43
goom_irand(GoomRandom * grandom,int i)44 inline static int goom_irand(GoomRandom *grandom, int i) {
45
46 grandom->pos++;
47 return grandom->array[grandom->pos] % i;
48 }
49
50 /* called to change the specified number of value in the array, so that the array does not remain the same*/
51 void goom_random_update_array(GoomRandom *grandom, int numberOfValuesToChange);
52
53 #endif
54