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diff --git a/external/include/glm/gtx/matrix_transform_2d.hpp b/external/include/glm/gtx/matrix_transform_2d.hpp
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+/// @ref gtx_matrix_transform_2d
+/// @file glm/gtx/matrix_transform_2d.hpp
+/// @author Miguel Ángel Pérez Martínez
+///
+/// @see core (dependence)
+///
+/// @defgroup gtx_matrix_transform_2d GLM_GTX_matrix_transform_2d
+/// @ingroup gtx
+///
+/// @brief Defines functions that generate common 2d transformation matrices.
+///
+/// <glm/gtx/matrix_transform_2d.hpp> need to be included to use these functionalities.
+
+#pragma once
+
+// Dependency:
+#include "../mat3x3.hpp"
+#include "../vec2.hpp"
+
+
+#if GLM_MESSAGES == GLM_MESSAGES_ENABLED && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_GTX_matrix_transform_2d extension included")
+#endif
+
+namespace glm
+{
+	/// @addtogroup gtx_matrix_transform_2d
+	/// @{
+	
+	/// Builds a translation 3 * 3 matrix created from a vector of 2 components.
+	///
+	/// @param m Input matrix multiplied by this translation matrix.
+	/// @param v Coordinates of a translation vector.		
+	template <typename T, precision P>
+	GLM_FUNC_QUALIFIER tmat3x3<T, P> translate(
+		tmat3x3<T, P> const & m,
+		tvec2<T, P> const & v);
+
+	/// Builds a rotation 3 * 3 matrix created from an angle. 
+	///
+	/// @param m Input matrix multiplied by this translation matrix.
+	/// @param angle Rotation angle expressed in radians if GLM_FORCE_RADIANS is defined or degrees otherwise.
+	template <typename T, precision P> 
+	GLM_FUNC_QUALIFIER tmat3x3<T, P> rotate(
+		tmat3x3<T, P> const & m,
+		T angle);
+
+	/// Builds a scale 3 * 3 matrix created from a vector of 2 components.
+	///
+	/// @param m Input matrix multiplied by this translation matrix.
+	/// @param v Coordinates of a scale vector.		
+	template <typename T, precision P> 
+	GLM_FUNC_QUALIFIER tmat3x3<T, P> scale(
+		tmat3x3<T, P> const & m,
+		tvec2<T, P> const & v);
+
+	/// Builds an horizontal (parallel to the x axis) shear 3 * 3 matrix. 
+	///
+	/// @param m Input matrix multiplied by this translation matrix.
+	/// @param y Shear factor.
+	template <typename T, precision P> 
+	GLM_FUNC_QUALIFIER tmat3x3<T, P> shearX(
+		tmat3x3<T, P> const & m,
+		T y);
+
+	/// Builds a vertical (parallel to the y axis) shear 3 * 3 matrix. 
+	///
+	/// @param m Input matrix multiplied by this translation matrix.
+	/// @param x Shear factor.
+	template <typename T, precision P> 
+	GLM_FUNC_QUALIFIER tmat3x3<T, P> shearY(
+		tmat3x3<T, P> const & m,
+		T x);
+
+	/// @}
+}//namespace glm
+
+#include "matrix_transform_2d.inl"