/* -----------------------------------------------------------------------------
	GSFramework
	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
----------------------------------------------------------------------------- */


		#include "geometry/plane.h"
		#include "math/matrix4.h"

		using namespace GS;


//------------------------------------------------------------------------------
void		Plane::Set(const Vector4 *_p, const Vector4 &_n, const Matrix4 *mtx)
{
	if	(mtx)
	{
		if	(_p)
				mtx->Apply(&p, _p);
		else	p = mtx->GetRow(3);
		mtx->ApplyRotation(&n, &_n);
	}
	else
	{
		if	(_p)
				p = *_p;
		else	p.Set(0, 0, 0, 1);
		n = _n;
	}
	d = -p.Dot(n);
}
void		Plane::Set(const Vector4 _p[3], const Matrix4 *mtx)
{
	Vector4	_n = (_p[1] - _p[0]).Cross(_p[2] - _p[0]);
	Set(&_p[0], _n, mtx);
}
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
Plane::Plane()
{
	d = 0;
	p.Set();
	n.Set();
}
//------------------------------------------------------------------------------