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+///////////////////////////////////////////////////////////////////////////////////
+/// 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.hpp
+/// @date 2006-01-04 / 2011-06-07
+/// @author Christophe Riccio
+///
+/// @see core (dependence)
+///
+/// @defgroup gtx_fast_square_root GLM_GTX_fast_square_root
+/// @ingroup gtx
+/// 
+/// @brief 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
+/// 
+/// <glm/gtx/fast_square_root.hpp> need to be included to use these functionalities.
+///////////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+// Dependency:
+#include "../common.hpp"
+#include "../exponential.hpp"
+#include "../geometric.hpp"
+
+#if(defined(GLM_MESSAGES) && !defined(GLM_EXT_INCLUDED))
+#	pragma message("GLM: GLM_GTX_fast_square_root extension included")
+#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 <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_DECL vecType<T, P> fastSqrt(vecType<T, P> 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 <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_DECL vecType<T, P> fastInverseSqrt(vecType<T, P> 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 <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_DECL T fastLength(vecType<T, P> 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 <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_DECL T fastDistance(vecType<T, P> const & x, vecType<T, P> 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"