/*
Open Asset Import Library (ASSIMP)
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  following disclaimer.

* Redistributions in binary form must reproduce the above
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  following disclaimer in the documentation and/or other
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* Neither the name of the ASSIMP team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/

/** @file aiQuaternion.h
 *  @brief Quaternion structure, including operators when compiling in C++
 */
#ifndef AI_QUATERNION_H_INC
#define AI_QUATERNION_H_INC

#ifdef __cplusplus

template <typename TReal> class aiVector3t;
template <typename TReal> class aiMatrix3x3t;

// ---------------------------------------------------------------------------
/** Represents a quaternion in a 4D vector. */
template <typename TReal>
class aiQuaterniont
{
public:
	aiQuaterniont() : w(), x(), y(), z() {}
	aiQuaterniont(TReal w, TReal x, TReal y, TReal z) 
		: w(w), x(x), y(y), z(z) {}

	/** Construct from rotation matrix. Result is undefined if the matrix is not orthonormal. */
	aiQuaterniont( const aiMatrix3x3t<TReal>& pRotMatrix);

	/** Construct from euler angles */
	aiQuaterniont( TReal rotx, TReal roty, TReal rotz);

	/** Construct from an axis-angle pair */
	aiQuaterniont( aiVector3t<TReal> axis, TReal angle);

	/** Construct from a normalized quaternion stored in a vec3 */
	aiQuaterniont( aiVector3t<TReal> normalized);

	/** Returns a matrix representation of the quaternion */
	aiMatrix3x3t<TReal> GetMatrix() const;

public:

	bool operator== (const aiQuaterniont& o) const;
	bool operator!= (const aiQuaterniont& o) const;

public:

	/** Normalize the quaternion */
	aiQuaterniont& Normalize();

	/** Compute quaternion conjugate */
	aiQuaterniont& Conjugate ();

	/** Rotate a point by this quaternion */
	aiVector3t<TReal> Rotate (const aiVector3t<TReal>& in);

	/** Multiply two quaternions */
	aiQuaterniont operator* (const aiQuaterniont& two) const;

public:

	/** Performs a spherical interpolation between two quaternions and writes the result into the third.
	 * @param pOut Target object to received the interpolated rotation.
	 * @param pStart Start rotation of the interpolation at factor == 0.
	 * @param pEnd End rotation, factor == 1.
	 * @param pFactor Interpolation factor between 0 and 1. Values outside of this range yield undefined results.
	 */
	static void Interpolate( aiQuaterniont& pOut, const aiQuaterniont& pStart, 
		const aiQuaterniont& pEnd, TReal pFactor);

public:

	//! w,x,y,z components of the quaternion
	TReal w, x, y, z;	
} ;

typedef aiQuaterniont<float> aiQuaternion;

#else

struct aiQuaternion {
	float w, x, y, z;	
};

#endif


#endif // AI_QUATERNION_H_INC