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#ifndef __TRIANGLE_H
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#define __TRIANGLE_H
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#include "CGLA/Vec2f.h"
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#include "CGLA/Vec3f.h"
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#include "CGLA/Mat3x3f.h"
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#define COMPUTE_SIGN
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class Triangle
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{
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	CGLA::Vec3f vert[3];
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	CGLA::Vec3f edge[3];
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#ifdef COMPUTE_SIGN
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	CGLA::Vec3f vert_norm[3];
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	CGLA::Vec3f edge_norm[3];
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#endif
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	CGLA::Vec3f face_norm;
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	CGLA::Vec3f tri_plane_edge_norm[3];
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	float edge_len[3];
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 public:
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	Triangle() {}
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	Triangle(const CGLA::Vec3f& _v0,
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					 const CGLA::Vec3f& _v1,
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					 const CGLA::Vec3f& _v2,
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					 const CGLA::Vec3f& _vn0,
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					 const CGLA::Vec3f& _vn1,
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					 const CGLA::Vec3f& _vn2,
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					 const CGLA::Vec3f& _en0,
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					 const CGLA::Vec3f& _en1,
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					 const CGLA::Vec3f& _en2);
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	bool intersect(const CGLA::Vec3f&, const CGLA::Vec3f&, float&) const;
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	const CGLA::Vec3f get_pmin() const
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	{
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		return v_min(vert[0],v_min(vert[1],vert[2]));
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	}
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	const CGLA::Vec3f get_pmax() const
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	{
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		return v_max(vert[0],v_max(vert[1],vert[2]));
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	}
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	const CGLA::Vec3f centre() const
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		{
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			return (vert[0]+vert[1]+vert[2])/3.0f;
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		}
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	const float area() const
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		{
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			return 0.5 * (cross(edge[0],-edge[2])).length();
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		}
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	const CGLA::Vec3f get_centre() const
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	{
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		CGLA::Vec3f pmin = get_pmin();
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		CGLA::Vec3f pmax = get_pmax();
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		return (pmax-pmin)/2.0f+pmin;
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	}
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	bool signed_distance(const CGLA::Vec3f& p, float& sq_dist, float& sgn) const;
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	CGLA::Vec3f get_v0() const {return vert[0];}
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	CGLA::Vec3f get_v1() const {return vert[1];}
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	CGLA::Vec3f get_v2() const {return vert[2];}
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	const CGLA::Vec3f& get_edge(int i) const {return edge[i];}
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};
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#endif