source: trunk/src/half.h @ 1041

Last change on this file since 1041 was 1041, checked in by sam, 9 years ago

core: new combinations of integer vectors (unsigned, 8-bit, etc.), dot and
cross product, normalize, etc.

  • Property svn:keywords set to Id
File size: 3.9 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 Half class
13// --------------
14//
15
16#if !defined __LOL_HALF_H__
17#define __LOL_HALF_H__
18
19#include <cstdio>
20#include <stdint.h>
21
22namespace lol
23{
24
25class half
26{
27public:
28    /* Constructors. Always inline so that the code can work in registers
29     * instead of calling routines with the hidden "this" parameter. */
30    inline half() { }
31    inline half(int f) { *this = makefast(f); }
32    inline half(float f) { *this = makefast(f); }
33    inline half(double f) { *this = makefast(f); }
34
35    inline int is_nan() const
36    {
37        return ((bits & 0x7c00u) == 0x7c00u) && (bits & 0x03ffu);
38    }
39
40    inline int is_finite() const
41    {
42        return (bits & 0x7c00u) != 0x7c00u;
43    }
44
45    inline int is_inf() const
46    {
47        return (uint16_t)(bits << 1) == (0x7c00u << 1);
48    }
49
50    inline int is_normal() const
51    {
52        return (is_finite() && (bits & 0x7c00u)) || ((bits & 0x7fffu) == 0);
53    }
54
55    /* Cast to other types -- always inline, see constructors */
56    inline half &operator =(int f) { return *this = makefast(f); }
57    inline half &operator =(float f) { return *this = makefast(f); }
58    inline half &operator =(double f) { return *this = makefast(f); }
59    inline operator int() const { return (int)tofloat(*this); }
60    inline operator float() const { return tofloat(*this); }
61
62    static float tofloat(half h);
63
64    /* Array conversions */
65    static size_t convert(half *dst, float const *src, size_t nelem);
66    static size_t convert(float *dst, half const *src, size_t nelem);
67
68    /* Operations */
69    inline half operator -() { return makebits(bits ^ 0x8000u); }
70    inline half &operator +=(float f) { return (*this = (half)(*this + f)); }
71    inline half &operator -=(float f) { return (*this = (half)(*this - f)); }
72    inline half &operator *=(float f) { return (*this = (half)(*this * f)); }
73    inline half &operator /=(float f) { return (*this = (half)(*this / f)); }
74    inline half &operator +=(half h) { return (*this = (half)(*this + h)); }
75    inline half &operator -=(half h) { return (*this = (half)(*this - h)); }
76    inline half &operator *=(half h) { return (*this = (half)(*this * h)); }
77    inline half &operator /=(half h) { return (*this = (half)(*this / h)); }
78
79    inline float operator +(float f) const { return (float)*this + f; }
80    inline float operator -(float f) const { return (float)*this - f; }
81    inline float operator *(float f) const { return (float)*this * f; }
82    inline float operator /(float f) const { return (float)*this / f; }
83    inline float operator +(half h) const { return (float)*this + (float)h; }
84    inline float operator -(half h) const { return (float)*this - (float)h; }
85    inline float operator *(half h) const { return (float)*this * (float)h; }
86    inline float operator /(half h) const { return (float)*this / (float)h; }
87
88    /* Factories */
89    static half makefast(float f);
90    static half makeaccurate(float f);
91    static inline half makebits(uint16_t x)
92    {
93        half ret;
94        ret.bits = x;
95        return ret;
96    }
97
98    /* Internal representation */
99    uint16_t bits;
100};
101
102inline float &operator +=(float &f, half h) { return f += (float)h; }
103inline float &operator -=(float &f, half h) { return f -= (float)h; }
104inline float &operator *=(float &f, half h) { return f *= (float)h; }
105inline float &operator /=(float &f, half h) { return f /= (float)h; }
106
107inline float operator +(float f, half h) { return f + (float)h; }
108inline float operator -(float f, half h) { return f - (float)h; }
109inline float operator *(float f, half h) { return f * (float)h; }
110inline float operator /(float f, half h) { return f / (float)h; }
111
112} /* namespace lol */
113
114#endif // __LOL_HALF_H__
115
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