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Diffstat (limited to '3rdparty/include/glm/gtx/fast_square_root.inl')
| -rw-r--r-- | 3rdparty/include/glm/gtx/fast_square_root.inl | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/3rdparty/include/glm/gtx/fast_square_root.inl b/3rdparty/include/glm/gtx/fast_square_root.inl new file mode 100644 index 0000000..9db769d --- /dev/null +++ b/3rdparty/include/glm/gtx/fast_square_root.inl @@ -0,0 +1,110 @@ +/////////////////////////////////////////////////////////////////////////////////// +/// OpenGL Mathematics (glm.g-truc.net) +/// +/// Copyright (c) 2005 - 2015 G-Truc Creation (www.g-truc.net) +/// Permission is hereby granted, free of charge, to any person obtaining a copy +/// of this software and associated documentation files (the "Software"), to deal +/// in the Software without restriction, including without limitation the rights +/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +/// copies of the Software, and to permit persons to whom the Software is +/// furnished to do so, subject to the following conditions: +/// +/// The above copyright notice and this permission notice shall be included in +/// all copies or substantial portions of the Software. +/// +/// Restrictions: +/// By making use of the Software for military purposes, you choose to make +/// a Bunny unhappy. +/// +/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +/// THE SOFTWARE. +/// +/// @ref gtx_fast_square_root +/// @file glm/gtx/fast_square_root.inl +/// @date 2006-01-04 / 2011-06-07 +/// @author Christophe Riccio +/////////////////////////////////////////////////////////////////////////////////////////////////// + +namespace glm +{ + // fastSqrt + template <typename genType> + GLM_FUNC_QUALIFIER genType fastSqrt(genType x) + { + GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'fastSqrt' only accept floating-point input"); + + return genType(1) / fastInverseSqrt(x); + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> fastSqrt(vecType<T, P> const & x) + { + return detail::functor1<T, T, P, vecType>::call(fastSqrt, x); + } + + // fastInversesqrt + template <typename genType> + GLM_FUNC_QUALIFIER genType fastInverseSqrt(genType x) + { +# ifdef __CUDACC__ // Wordaround for a CUDA compiler bug up to CUDA6 + tvec1<T, P> tmp(detail::compute_inversesqrt<tvec1, genType, lowp>::call(tvec1<genType, lowp>(x))); + return tmp.x; +# else + return detail::compute_inversesqrt<tvec1, genType, lowp>::call(tvec1<genType, lowp>(x)).x; +# endif + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> fastInverseSqrt(vecType<T, P> const & x) + { + return detail::compute_inversesqrt<vecType, T, P>::call(x); + } + + // fastLength + template <typename genType> + GLM_FUNC_QUALIFIER genType fastLength(genType x) + { + GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'fastLength' only accept floating-point inputs"); + + return abs(x); + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER T fastLength(vecType<T, P> const & x) + { + GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'fastLength' only accept floating-point inputs"); + + return fastSqrt(dot(x, x)); + } + + // fastDistance + template <typename genType> + GLM_FUNC_QUALIFIER genType fastDistance(genType x, genType y) + { + return fastLength(y - x); + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER T fastDistance(vecType<T, P> const & x, vecType<T, P> const & y) + { + return fastLength(y - x); + } + + // fastNormalize + template <typename genType> + GLM_FUNC_QUALIFIER genType fastNormalize(genType x) + { + return x > genType(0) ? genType(1) : -genType(1); + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> fastNormalize(vecType<T, P> const & x) + { + return x * fastInverseSqrt(dot(x, x)); + } +}//namespace glm |