source: trunk/src/real.h @ 1017

Last change on this file since 1017 was 1017, checked in by sam, 9 years ago

core: fix an accuracy error in real::re() and real::sqrt() introduced in
the 16-to-32-bit refactoring.

File size: 3.0 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 Real class
13// --------------
14//
15
16#if !defined __LOL_REAL_H__
17#define __LOL_REAL_H__
18
19#include <stdint.h>
20
21namespace lol
22{
23
24class real
25{
26public:
27    inline real() { }
28
29    real(float f);
30    real(double f);
31    real(int i);
32    real(unsigned int i);
33
34    operator float() const;
35    operator double() const;
36    operator int() const;
37    operator unsigned int() const;
38
39    real operator +() const;
40    real operator -() const;
41    real operator +(real const &x) const;
42    real operator -(real const &x) const;
43    real operator *(real const &x) const;
44    real operator /(real const &x) const;
45    real &operator +=(real const &x);
46    real &operator -=(real const &x);
47    real &operator *=(real const &x);
48    real &operator /=(real const &x);
49
50    real operator <<(int x) const;
51    real operator >>(int x) const;
52    real &operator <<=(int x);
53    real &operator >>=(int x);
54
55    bool operator ==(real const &x) const;
56    bool operator !=(real const &x) const;
57    bool operator <(real const &x) const;
58    bool operator >(real const &x) const;
59    bool operator <=(real const &x) const;
60    bool operator >=(real const &x) const;
61
62    bool operator !() const;
63    operator bool() const;
64
65    friend real fabs(real const &x);
66
67    friend real re(real const &x);
68    friend real sqrt(real const &x);
69    friend real log(real const &x);
70    friend real exp(real const &x);
71
72    friend real floor(real const &x);
73    friend real ceil(real const &x);
74    friend real round(real const &x);
75    friend real fmod(real const &x, real const &y);
76
77    friend real sin(real const &x);
78    friend real cos(real const &x);
79    friend real asin(real const &x);
80    friend real acos(real const &x);
81    friend real atan(real const &x);
82
83    void print(int ndigits = 150) const;
84
85    static real const R_0;
86    static real const R_1;
87    static real const R_2;
88    static real const R_3;
89    static real const R_10;
90
91    static real const R_E;
92    static real const R_LOG2E;
93    static real const R_LOG10E;
94    static real const R_LN2;
95    static real const R_LN10;
96    static real const R_PI;
97    static real const R_PI_2;
98    static real const R_PI_3;
99    static real const R_PI_4;
100    static real const R_1_PI;
101    static real const R_2_PI;
102    static real const R_2_SQRTPI;
103    static real const R_SQRT2;
104    static real const R_SQRT3;
105    static real const R_SQRT1_2;
106
107    /* XXX: changing this requires tuning real::fres (the number of
108     * Newton-Raphson iterations) and real::print (the number of printed
109     * digits) */
110    static int const BIGITS = 16;
111    static int const BIGIT_BITS = 32;
112
113private:
114    uint32_t m_size;
115    uint32_t m_signexp;
116    uint32_t m_mantissa[BIGITS];
117};
118
119} /* namespace lol */
120
121#endif // __LOL_REAL_H__
122
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