text: ///////////////////////////////////////////////////////////////////////////////////
  /// OpenGL Mathematics (glm.g-truc.net)
  ///
  /// Copyright (c) 2005 - 2014 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,
  /// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  /// THE SOFTWARE.
  ///
  /// @ref gtx_fast_exponential
  /// @file glm/gtx/fast_exponential.hpp
  /// @date 2006-01-09 / 2011-06-07
  /// @author Christophe Riccio
  ///
  /// @see core (dependence)
  /// @see gtx_half_float (dependence)
  ///
  /// @defgroup gtx_fast_exponential GLM_GTX_fast_exponential
  /// @ingroup gtx
  ///
  /// @brief Fast but less accurate implementations of exponential based functions.
  ///
  /// <glm/gtx/fast_exponential.hpp> need to be included to use these functionalities.
  ///////////////////////////////////////////////////////////////////////////////////
  
  #ifndef GLM_GTX_fast_exponential
  #define GLM_GTX_fast_exponential
  
  // Dependency:
  #include "../glm.hpp"
  
  #if(defined(GLM_MESSAGES) && !defined(GLM_EXT_INCLUDED))
  #	pragma message("GLM: GLM_GTX_fast_exponential extension included")
  #endif
  
  namespace glm
  {
  	/// @addtogroup gtx_fast_exponential
  	/// @{
  
  	/// Faster than the common pow function but less accurate.
  	/// @see gtx_fast_exponential
  	template <typename genType>
  	GLM_FUNC_DECL genType fastPow(
  		genType const & x,
  		genType const & y);
  
  	/// Faster than the common pow function but less accurate.
  	/// @see gtx_fast_exponential
  	template <typename genTypeT, typename genTypeU>
  	GLM_FUNC_DECL genTypeT fastPow(
  		genTypeT const & x,
  		genTypeU const & y);
  
  	/// Faster than the common exp function but less accurate.
  	/// @see gtx_fast_exponential
  	template <typename T>
  	GLM_FUNC_DECL T fastExp(const T& x);
  
  	/// Faster than the common log function but less accurate.
  	/// @see gtx_fast_exponential
  	template <typename T>
  	GLM_FUNC_DECL T fastLog(const T& x);
  
  	/// Faster than the common exp2 function but less accurate.
  	/// @see gtx_fast_exponential
  	template <typename T>
  	GLM_FUNC_DECL T fastExp2(const T& x);
  
  	/// Faster than the common log2 function but less accurate.
  	/// @see gtx_fast_exponential
  	template <typename T>
  	GLM_FUNC_DECL T fastLog2(const T& x);
  
  	/// Faster than the common ln function but less accurate.
  	/// @see gtx_fast_exponential
  	template <typename T>
  	GLM_FUNC_DECL T fastLn(const T& x);
  
  	/// @}
  }//namespace glm
  
  #include "fast_exponential.inl"
  
  #endif//GLM_GTX_fast_exponential
  