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lib/glm/gtx/vector_angle.hpp

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+/// @ref gtx_vector_angle
+/// @file glm/gtx/vector_angle.hpp
+///
+/// @see core (dependence)
+/// @see gtx_quaternion (dependence)
+/// @see gtx_epsilon (dependence)
+///
+/// @defgroup gtx_vector_angle GLM_GTX_vector_angle
+/// @ingroup gtx
+///
+/// @brief Compute angle between vectors
+///
+/// <glm/gtx/vector_angle.hpp> need to be included to use these functionalities.
+
+#pragma once
+
+// Dependency:
+#include "../glm.hpp"
+#include "../gtc/epsilon.hpp"
+#include "../gtx/quaternion.hpp"
+#include "../gtx/rotate_vector.hpp"
+
+#if GLM_MESSAGES == GLM_MESSAGES_ENABLED && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_GTX_vector_angle extension included")
+#endif
+
+namespace glm
+{
+	/// @addtogroup gtx_vector_angle
+	/// @{
+
+	//! Returns the absolute angle between two vectors.
+	//! Parameters need to be normalized.
+	/// @see gtx_vector_angle extension.
+	template <typename vecType>
+	GLM_FUNC_DECL typename vecType::value_type angle(
+		vecType const & x, 
+		vecType const & y);
+
+	//! Returns the oriented angle between two 2d vectors.
+	//! Parameters need to be normalized.
+	/// @see gtx_vector_angle extension.
+	template <typename T, precision P>
+	GLM_FUNC_DECL T orientedAngle(
+		tvec2<T, P> const & x,
+		tvec2<T, P> const & y);
+
+	//! Returns the oriented angle between two 3d vectors based from a reference axis.
+	//! Parameters need to be normalized.
+	/// @see gtx_vector_angle extension.
+	template <typename T, precision P>
+	GLM_FUNC_DECL T orientedAngle(
+		tvec3<T, P> const & x,
+		tvec3<T, P> const & y,
+		tvec3<T, P> const & ref);
+
+	/// @}
+}// namespace glm
+
+#include "vector_angle.inl"