1#ifndef _DERANDOM_H
2#define _DERANDOM_H
3/*-------------------------------------------------------------------------
4 * drawElements Base Portability Library
5 * -------------------------------------
6 *
7 * Copyright 2014 The Android Open Source Project
8 *
9 * Licensed under the Apache License, Version 2.0 (the "License");
10 * you may not use this file except in compliance with the License.
11 * You may obtain a copy of the License at
12 *
13 *      http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 *
21 *//*!
22 * \file
23 * \brief Random number generation.
24 *//*--------------------------------------------------------------------*/
25
26#include "deDefs.h"
27
28DE_BEGIN_EXTERN_C
29
30/*--------------------------------------------------------------------*//*!
31 * \brief Random number generator.
32 *
33 * Uses the Xorshift algorithm for producing pseudo-random numbers. The
34 * values are generated based on an initial seed and the same seed always
35 * produces the same sequence of numbers.
36 *
37 * See: http://en.wikipedia.org/wiki/Xorshift
38 *//*--------------------------------------------------------------------*/
39typedef struct deRandom_s
40{
41	deUint32	x;		/*!< Current random state.		*/
42	deUint32	y;
43	deUint32	z;
44	deUint32	w;
45} deRandom;
46
47void		deRandom_init			(deRandom* rnd, deUint32 seed);
48deUint32	deRandom_getUint32		(deRandom* rnd);
49deUint64	deRandom_getUint64		(deRandom* rnd);
50float		deRandom_getFloat		(deRandom* rnd);
51double		deRandom_getDouble		(deRandom* rnd);
52deBool		deRandom_getBool		(deRandom* rnd);
53
54DE_END_EXTERN_C
55
56#endif /* _DERANDOM_H */
57