///////////////////////////////////////////////////////////////////////////////////

/// OpenGL Mathematics (glm.g-truc.net)

///

/// Copyright (c) 2005 - 2012 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.

/// 

/// 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,

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/// 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: Fast square root functions

/// @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.

///////////////////////////////////////////////////////////////////////////////////



#ifndef GLM_GTX_fast_square_root

#define GLM_GTX_fast_square_root GLM_VERSION



// Dependency:

#include "../glm.hpp"



#if(defined(GLM_MESSAGES) && !defined(glm_ext))

#	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.

	//! From GLM_GTX_fast_square_root extension.

	template <typename genType> 

	genType fastSqrt(genType const & x);



	//! Faster than the common inversesqrt function but less accurate.

	//! From GLM_GTX_fast_square_root extension.

	template <typename genType> 

	genType fastInverseSqrt(genType const & x);

		

	//! Faster than the common length function but less accurate.

	//! From GLM_GTX_fast_square_root extension.

	template <typename genType> 

	typename genType::value_type fastLength(genType const & x);



	//! Faster than the common distance function but less accurate.

	//! From GLM_GTX_fast_square_root extension.

	template <typename genType> 

	typename genType::value_type fastDistance(genType const & x, genType const & y);



	//! Faster than the common normalize function but less accurate.

	//! From GLM_GTX_fast_square_root extension.

	template <typename genType> 

	genType fastNormalize(genType const & x);



	/// @}

}// namespace glm



#include "fast_square_root.inl"



#endif//GLM_GTX_fast_square_root