/glm/gtx/fast_square_root.hpp
C++ Header | 85 lines | 21 code | 12 blank | 52 comment | 1 complexity | b0cb184be27e1e2df882df88c62abd09 MD5 | raw file
1///////////////////////////////////////////////////////////////////////////////////
2/// OpenGL Mathematics (glm.g-truc.net)
3///
4/// Copyright (c) 2005 - 2012 G-Truc Creation (www.g-truc.net)
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9/// copies of the Software, and to permit persons to whom the Software is
10/// furnished to do so, subject to the following conditions:
11///
12/// The above copyright notice and this permission notice shall be included in
13/// all copies or substantial portions of the Software.
14///
15/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21/// THE SOFTWARE.
22///
23/// @ref gtx_fast_square_root
24/// @file glm/gtx/fast_square_root.hpp
25/// @date 2006-01-04 / 2011-06-07
26/// @author Christophe Riccio
27///
28/// @see core (dependence)
29///
30/// @defgroup gtx_fast_square_root GLM_GTX_fast_square_root: Fast square root functions
31/// @ingroup gtx
32///
33/// @brief Fast but less accurate implementations of square root based functions.
34/// - Sqrt optimisation based on Newton's method,
35/// www.gamedev.net/community/forums/topic.asp?topic id=139956
36///
37/// <glm/gtx/fast_square_root.hpp> need to be included to use these functionalities.
38///////////////////////////////////////////////////////////////////////////////////
39
40#ifndef GLM_GTX_fast_square_root
41#define GLM_GTX_fast_square_root GLM_VERSION
42
43// Dependency:
44#include "../glm.hpp"
45
46#if(defined(GLM_MESSAGES) && !defined(glm_ext))
47# pragma message("GLM: GLM_GTX_fast_square_root extension included")
48#endif
49
50namespace glm
51{
52 /// @addtogroup gtx_fast_square_root
53 /// @{
54
55 //! Faster than the common sqrt function but less accurate.
56 //! From GLM_GTX_fast_square_root extension.
57 template <typename genType>
58 genType fastSqrt(genType const & x);
59
60 //! Faster than the common inversesqrt function but less accurate.
61 //! From GLM_GTX_fast_square_root extension.
62 template <typename genType>
63 genType fastInverseSqrt(genType const & x);
64
65 //! Faster than the common length function but less accurate.
66 //! From GLM_GTX_fast_square_root extension.
67 template <typename genType>
68 typename genType::value_type fastLength(genType const & x);
69
70 //! Faster than the common distance function but less accurate.
71 //! From GLM_GTX_fast_square_root extension.
72 template <typename genType>
73 typename genType::value_type fastDistance(genType const & x, genType const & y);
74
75 //! Faster than the common normalize function but less accurate.
76 //! From GLM_GTX_fast_square_root extension.
77 template <typename genType>
78 genType fastNormalize(genType const & x);
79
80 /// @}
81}// namespace glm
82
83#include "fast_square_root.inl"
84
85#endif//GLM_GTX_fast_square_root