1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/// @ref gtx_fast_square_root
/// @file glm/gtx/fast_square_root.hpp
///
/// @see core (dependence)
///
/// @defgroup gtx_fast_square_root GLM_GTX_fast_square_root
/// @ingroup gtx
///
/// Include <glm/gtx/fast_square_root.hpp> to use the features of this extension.
///
/// Fast but less accurate implementations of square root based functions.
/// - Sqrt optimisation based on Newton's method,
/// www.gamedev.net/community/forums/topic.asp?topic id=139956
#pragma once
// Dependency:
#include "../common.hpp"
#include "../exponential.hpp"
#include "../geometric.hpp"
#if GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)
# ifndef GLM_ENABLE_EXPERIMENTAL
# pragma message("GLM: GLM_GTX_fast_square_root is an experimental extension and may change in the future. Use #define GLM_ENABLE_EXPERIMENTAL before including it, if you really want to use it.")
# else
# pragma message("GLM: GLM_GTX_fast_square_root extension included")
# endif
#endif
namespace glm
{
/// @addtogroup gtx_fast_square_root
/// @{
/// Faster than the common sqrt function but less accurate.
///
/// @see gtx_fast_square_root extension.
template<typename genType>
GLM_FUNC_DECL genType fastSqrt(genType x);
/// Faster than the common sqrt function but less accurate.
///
/// @see gtx_fast_square_root extension.
template<length_t L, typename T, qualifier Q>
GLM_FUNC_DECL vec<L, T, Q> fastSqrt(vec<L, T, Q> const& x);
/// Faster than the common inversesqrt function but less accurate.
///
/// @see gtx_fast_square_root extension.
template<typename genType>
GLM_FUNC_DECL genType fastInverseSqrt(genType x);
/// Faster than the common inversesqrt function but less accurate.
///
/// @see gtx_fast_square_root extension.
template<length_t L, typename T, qualifier Q>
GLM_FUNC_DECL vec<L, T, Q> fastInverseSqrt(vec<L, T, Q> const& x);
/// Faster than the common length function but less accurate.
///
/// @see gtx_fast_square_root extension.
template<typename genType>
GLM_FUNC_DECL genType fastLength(genType x);
/// Faster than the common length function but less accurate.
///
/// @see gtx_fast_square_root extension.
template<length_t L, typename T, qualifier Q>
GLM_FUNC_DECL T fastLength(vec<L, T, Q> const& x);
/// Faster than the common distance function but less accurate.
///
/// @see gtx_fast_square_root extension.
template<typename genType>
GLM_FUNC_DECL genType fastDistance(genType x, genType y);
/// Faster than the common distance function but less accurate.
///
/// @see gtx_fast_square_root extension.
template<length_t L, typename T, qualifier Q>
GLM_FUNC_DECL T fastDistance(vec<L, T, Q> const& x, vec<L, T, Q> const& y);
/// Faster than the common normalize function but less accurate.
///
/// @see gtx_fast_square_root extension.
template<typename genType>
GLM_FUNC_DECL genType fastNormalize(genType const& x);
/// @}
}// namespace glm
#include "fast_square_root.inl"
|
