/*]  Copyright (c) 2009-2010, Charles McGarvey  [**************************
**]  All rights reserved.
*
* vi:ts=4 sw=4 tw=75
*
* Distributable under the terms and conditions of the 2-clause BSD license;
* see the file COPYING for a complete text of the license.
*
**************************************************************************/

#ifndef _MOOF_RAY_HH_
#define _MOOF_RAY_HH_

#include <Moof/Drawable.hh>
#include <Moof/Math.hh>
#include <Moof/OpenGL.hh>
#include <Moof/Texture.hh>


namespace Mf {


/**
 * A line that goes to infinity.
 */

template <int D>
struct Ray : public Drawable
{
	typedef cml::vector< Scalar, cml::fixed<D> >	Vector;

	// solution = point + t*direction
	Vector	point;
	Vector	direction;

	struct Contact
	{
		Scalar	distance;	// distance from the origin to the nearest point
		Vector	normal;		// surface normal at contact point

		bool operator < (const Contact& rhs)
		{
			return distance < rhs.distance;
		}
	};

	void solve(Vector& p, Scalar t) const
	{
		p = point + t*direction;
	}

	void draw(Scalar alpha = 0.0) const
	{
		Vector end = point + 1000.0 * direction;
		// FIXME this is kinda cheesy

		Mf::Texture::resetBind();
		glBegin(GL_LINES);
			glVertex(point);
			glVertex(end);
		glEnd();
	}

	void normalize()
	{
		direction.normalize();
	}
};


typedef Ray<2>	Ray2;
typedef Ray<3>	Ray3;


} // namespace Mf

#endif // _MOOF_RAY_HH_