source: trunk/src/numeric.h @ 761

Last change on this file since 761 was 761, checked in by sam, 10 years ago

core: don't explicitly use std:: prefix when the platform may not
recognise it.

File size: 1.2 KB
RevLine 
[293]1//
2// Lol Engine
3//
4// Copyright: (c) 2010-2011 Sam Hocevar <sam@hocevar.net>
5//   This program is free software; you can redistribute it and/or
6//   modify it under the terms of the Do What The Fuck You Want To
7//   Public License, Version 2, as published by Sam Hocevar. See
8//   http://sam.zoy.org/projects/COPYING.WTFPL for more details.
9//
10
11//
12// The Matrix classes
13// ------------------
14//
15
[748]16#if !defined __LOL_NUMERIC_H__
17#define __LOL_NUMERIC_H__
[293]18
19#include <cmath>
20#include <cstdlib>
[296]21#include <stdint.h>
[293]22
[686]23namespace lol
24{
25
[293]26/* Random float value */
27static inline float RandF()
28{
[761]29    using namespace std;
30    return (float)rand() / RAND_MAX;
[293]31}
32
33static inline float RandF(float val)
34{
35    return RandF() * val;
36}
37
38static inline float RandF(float min, float max)
39{
40    return min + RandF() * (max - min);
41}
42
43/* Next power of two. */
44template <typename T> static inline T PotUp(T val)
45{
46    val = val - 1;
47    if (sizeof(val) > 4) val = val | ((uint64_t)val >> 32);
48    if (sizeof(val) > 2) val = val | ((uint64_t)val >> 16);
49    if (sizeof(val) > 1) val = val | ((uint64_t)val >> 8);
50    val = val | ((uint64_t)val >> 4);
51    val = val | ((uint64_t)val >> 2);
52    val = val | ((uint64_t)val >> 1);
53    return val + 1;
54}
55
[686]56} /* namespace lol */
57
[748]58#endif // __LOL_NUMERIC_H__
[293]59
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