1 /////////////////////////////////////////////////////////////////////////////////// 2 /// OpenGL Mathematics (glm.g-truc.net) 3 /// 4 /// Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net) 5 /// Permission is hereby granted, free of charge, to any person obtaining a copy 6 /// of this software and associated documentation files (the "Software"), to deal 7 /// in the Software without restriction, including without limitation the rights 8 /// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 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 19 /// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 /// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 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 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 42 43 // Dependency: 44 #include "../glm.hpp" 45 46 #if(defined(GLM_MESSAGES) && !defined(GLM_EXT_INCLUDED)) 47 # pragma message("GLM: GLM_GTX_fast_square_root extension included") 48 #endif 49 50 namespace 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 GLM_FUNC_DECL 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 GLM_FUNC_DECL genType fastInverseSqrt(genType const & x); 64 65 //! Faster than the common inversesqrt function but less accurate. 66 //! From GLM_GTX_fast_square_root extension. 67 template <typename T, precision P, template <typename, precision> class vecType> 68 GLM_FUNC_DECL vecType<T, P> fastInverseSqrt(vecType<T, P> const & x); 69 70 //! Faster than the common length function but less accurate. 71 //! From GLM_GTX_fast_square_root extension. 72 template <typename genType> 73 GLM_FUNC_DECL typename genType::value_type fastLength(genType const & x); 74 75 //! Faster than the common distance function but less accurate. 76 //! From GLM_GTX_fast_square_root extension. 77 template <typename genType> 78 GLM_FUNC_DECL typename genType::value_type fastDistance(genType const & x, genType const & y); 79 80 //! Faster than the common normalize function but less accurate. 81 //! From GLM_GTX_fast_square_root extension. 82 template <typename genType> 83 GLM_FUNC_DECL genType fastNormalize(genType const & x); 84 85 /// @} 86 }// namespace glm 87 88 #include "fast_square_root.inl" 89 90 #endif//GLM_GTX_fast_square_root 91
