libtcod
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random.h
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1/* BSD 3-Clause License
2 *
3 * Copyright © 2008-2026, Jice and the libtcod contributors.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
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19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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31 */
34#pragma once
35#ifndef LIBTCOD_RANDOM_H_
36#define LIBTCOD_RANDOM_H_
37#include <stdint.h>
38
39#include "config.h"
40
41#ifdef __cplusplus
42extern "C" {
43#endif // __cplusplus
54static inline uint64_t TCOD_rng_splitmix64_next(uint64_t* state) {
55 // Based on http://xoshiro.di.unimi.it/splitmix64.c
56 uint64_t z = (*state += 0x9e3779b97f4a7c15);
57 z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
58 z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
59 return z ^ (z >> 31);
60}
61#ifdef __cplusplus
62} // extern "C"
63#endif // __cplusplus
64#endif // LIBTCOD_RANDOM_H_
config.h
Libtcod config header.
TCOD_rng_splitmix64_next
static uint64_t TCOD_rng_splitmix64_next(uint64_t *state)
Return the next random uint64_t from a SplitMix64 generator.
Definition random.h:54