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#ifndef __CGLA_MAT4X4_H__

#define __CGLA_MAT4X4_H__

#include "ExceptionStandard.h"

#include "CGLA.h"

#include "Vec3f.h"

#include "Vec3Hf.h"

#include "Vec4f.h"

#include "ArithSqMat4x4Float.h"

namespace CGLA {

	/** Four by four float matrix.

			This class is useful for transformations such as perspective projections 

			or translation where 3x3 matrices do not suffice. */

	class Mat4x4f: public ArithSqMat4x4Float<Vec4f, Mat4x4f>

	{

	public:

		/// Construct a Mat4x4f from four Vec4f vectors

		Mat4x4f(Vec4f _a, Vec4f _b, Vec4f _c, Vec4f _d): 

			ArithSqMat4x4Float<Vec4f, Mat4x4f> (_a,_b,_c,_d) {}

		/// Construct the NaN matrix

		Mat4x4f() {}

		/// Construct a matrix with identical elements.

		Mat4x4f(float a): 

			ArithSqMat4x4Float<Vec4f, Mat4x4f> (a) {}

		/// Construct from a pointed to array of 16 floats.

		explicit Mat4x4f(const float* sa): 

			ArithSqMat4x4Float<Vec4f, Mat4x4f> (sa) {}

	};

	/// Create a rotation _matrix. Rotates about one of the major axes.

	Mat4x4f rotation_Mat4x4f(CGLA::Axis axis, float angle);

	/// Create a translation matrix

	Mat4x4f translation_Mat4x4f(const Vec3f&);

	/// Create a scaling matrix.

	Mat4x4f scaling_Mat4x4f(const Vec3f&);

	/// Create an identity matrix.

	inline Mat4x4f identity_Mat4x4f()

	{

		return Mat4x4f(Vec4f(1,0,0,0), 

									 Vec4f(0,1,0,0), 

									 Vec4f(0,0,1,0), 

									 Vec4f(0,0,0,1));

	}

	/** Create a perspective matrix. Assumes the eye is at the origin and

			that we are looking down the negative z axis.

			ACTUALLY THE EYE IS NOT AT THE ORIGIN BUT BEHIND IT. CHECK UP ON

			THIS ONE */

	Mat4x4f perspective_Mat4x4f(float d);

}

#endif