summaryrefslogtreecommitdiffstats
path: root/misc/random.h
blob: 9a3bef2fbcf2e88e1320fba19c41d6585c7dcf3a (plain)
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
/*
 * Implementation of non-cryptographic pseudo-random number
 * generator algorithm known as xoshiro.
 *
 * This file is part of mpv.
 *
 * mpv is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * mpv 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <stdint.h>

/*
 * Initialize the pseudo-random number generator's state with
 * the given 64-bit seed.
 */
void mp_rand_seed(uint64_t seed);

/*
 * Return the next 64-bit psuedo-random integer, and update the state
 * accordingly.
 */
uint64_t mp_rand_next(void);

/*
 * Return a double value in the range of [0.0, 1.0) with uniform
 * distribution, and update the state accordingly.
 */
double mp_rand_next_double(void);