/// @ref ext_quaternion_transform
/// @file glm/ext/quaternion_transform.hpp
///
/// @see core (dependence)
///
/// @defgroup ext_quaternion_transform GLM_EXT_quaternion_transform
/// @ingroup ext
///
/// Include <glm/ext/quaternion_transform.hpp> to use the features of this extension.
///
/// Defines a templated quaternion type and several quaternion operations.

#pragma once

// Dependency:
#include "../common.hpp"
#include "../trigonometric.hpp"
#include "../geometric.hpp"

#if GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)
#	pragma message("GLM: GLM_EXT_quaternion_transform extension included")
#endif

namespace glm
{
	/// @addtogroup ext_quaternion_transform
	/// @{

	/// Rotates a quaternion from a vector of 3 components axis and an angle.
	///
	/// @param q Source orientation
	/// @param angle Angle expressed in radians.
	/// @param axis Axis of the rotation
	///
	/// @tparam T Floating-point scalar types
	/// @tparam Q Value from qualifier enum
	///
	/// @see ext_quaternion_transform
	template<typename T, qualifier Q>
	GLM_FUNC_DECL qua<T, Q> rotate(qua<T, Q> const& q, T const& angle, vec<3, T, Q> const& axis);

	/// Build a look at quaternion based on the default handedness.
	///
	/// @param direction Desired forward direction. Needs to be normalized.
	/// @param up Up vector, how the camera is oriented. Typically (0, 1, 0).
	template<typename T, qualifier Q>
	GLM_FUNC_DECL qua<T, Q> quatLookAt(
		vec<3, T, Q> const& direction,
		vec<3, T, Q> const& up);

	/// Build a right-handed look at quaternion.
	///
	/// @param direction Desired forward direction onto which the -z-axis gets mapped. Needs to be normalized.
	/// @param up Up vector, how the camera is oriented. Typically (0, 1, 0).
	template<typename T, qualifier Q>
	GLM_FUNC_DECL qua<T, Q> quatLookAtRH(
		vec<3, T, Q> const& direction,
		vec<3, T, Q> const& up);

	/// Build a left-handed look at quaternion.
	///
	/// @param direction Desired forward direction onto which the +z-axis gets mapped. Needs to be normalized.
	/// @param up Up vector, how the camera is oriented. Typically (0, 1, 0).
	template<typename T, qualifier Q>
	GLM_FUNC_DECL qua<T, Q> quatLookAtLH(
		vec<3, T, Q> const& direction,
		vec<3, T, Q> const& up);
	/// @}
} //namespace glm

#include "quaternion_transform.inl"