source: trunk/src/numeric.h @ 293

Last change on this file since 293 was 293, checked in by sam, 9 years ago

Add pseudorandom functions for floats.

File size: 1.2 KB
Line 
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
16#if !defined __DH_NUMERIC_H__
17#define __DH_NUMERIC_H__
18
19#include <cmath>
20#include <cstdlib>
21
22/* Random float value */
23static inline float RandF()
24{
25    return (float)rand() / RAND_MAX;
26}
27
28static inline float RandF(float val)
29{
30    return RandF() * val;
31}
32
33static inline float RandF(float min, float max)
34{
35    return min + RandF() * (max - min);
36}
37
38/* Next power of two. */
39template <typename T> static inline T PotUp(T val)
40{
41    val = val - 1;
42    if (sizeof(val) > 4) val = val | ((uint64_t)val >> 32);
43    if (sizeof(val) > 2) val = val | ((uint64_t)val >> 16);
44    if (sizeof(val) > 1) val = val | ((uint64_t)val >> 8);
45    val = val | ((uint64_t)val >> 4);
46    val = val | ((uint64_t)val >> 2);
47    val = val | ((uint64_t)val >> 1);
48    return val + 1;
49}
50
51#endif // __DH_NUMERIC_H__
52
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