Add glm 0.9.2

ExternalLibs/glm/gtx/fast_square_root.hpp

@@ -0,0 +1,68 @@
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2006-01-04
+// Updated : 2008-10-07
+// Licence : This source is under MIT License
+// File    : glm/gtx/fast_square_root.hpp
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Dependency:
+// - GLM core
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Note:
+// - Sqrt optimisation based on Newton's method, 
+// www.gamedev.net/community/forums/topic.asp?topic id=139956
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+#ifndef glm_gtx_fast_square_root
+#define glm_gtx_fast_square_root
+
+// Dependency:
+#include "../glm.hpp"
+
+#if(defined(GLM_MESSAGES) && !defined(glm_ext))
+#	pragma message("GLM: GLM_GTX_fast_square_root extension included")
+#endif
+
+namespace glm{
+namespace gtx{
+namespace fast_square_root 	///< GLM_GTX_fast_square_root extension: Fast but less accurate implementations of square root based functions.
+{
+	/// \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 fast_square_root
+}// namespace gtx
+}// namespace glm
+
+#include "fast_square_root.inl"
+
+namespace glm{using namespace gtx::fast_square_root;}
+
+#endif//glm_gtx_fast_square_root