# source:trunk/src/numeric.h@2279Tweet

Last change on this file since 2279 was 2279, checked in by touky, 7 years ago

Small fix in template lerp

File size: 1.4 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
8//   http://www.wtfpl.net/ for more details.
9//
10
11//
12// The Matrix classes
13// ------------------
14//
15
16#if !defined __LOL_NUMERIC_H__
17#define __LOL_NUMERIC_H__
18
19#include <cstdlib>
20#include <stdint.h>
21
22namespace lol
23{
24
25/* Random float value */
26static inline float RandF()
27{
28    using namespace std;
29    return (float)rand() / RAND_MAX;
30}
31
32static inline float RandF(float val)
33{
34    return RandF() * val;
35}
36
37static inline float RandF(float min, float max)
38{
39    return min + RandF() * (max - min);
40}
41
42/* Next power of two. */
43template <typename T> static inline T PotUp(T val)
44{
45    val = val - 1;
46    if (sizeof(val) > 4) val = val | ((uint64_t)val >> 32);
47    if (sizeof(val) > 2) val = val | ((uint64_t)val >> 16);
48    if (sizeof(val) > 1) val = val | ((uint64_t)val >> 8);
49    val = val | ((uint64_t)val >> 4);
50    val = val | ((uint64_t)val >> 2);
51    val = val | ((uint64_t)val >> 1);
52    return val + 1;
53}
54
55//Damp for float
56template <typename T1, typename T2, typename Tf> static inline T1 damp(const T1 &a, const T2 &b, const Tf &x, const Tf &dt)
57{
58    if (dt <= .0f)
59        return a;
60    return lol::lerp(a, b, dt / (dt + x));
61}
62
63} /* namespace lol */
64
65#endif // __LOL_NUMERIC_H__
66
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