godot/core/math/quick_hull.h

/*************************************************************************/
/*  quick_hull.h                                                         */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
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/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
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/* the following conditions:                                             */
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/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/*************************************************************************/
#ifndef QUICK_HULL_H
#define QUICK_HULL_H

#include "rect3.h"
#include "set.h"
#include "list.h"
#include "geometry.h"

class QuickHull {

public:


	struct Edge {

		union {
			uint32_t vertices[2];
			uint64_t id;
		};


		bool operator<(const Edge& p_edge) const {
			return id < p_edge.id;
		}

		Edge(int p_vtx_a=0,int p_vtx_b=0) {

			if (p_vtx_a>p_vtx_b) {
				SWAP(p_vtx_a,p_vtx_b);
			}

			vertices[0]=p_vtx_a;
			vertices[1]=p_vtx_b;
		}
	};

	struct Face {

		Plane plane;
		int vertices[3];
		Vector<int> points_over;

		bool operator<(const Face& p_face) const {

			return points_over.size() < p_face.points_over.size();
		}

	};
private:

	struct FaceConnect {
		List<Face>::Element *left,*right;
		FaceConnect() { left=NULL; right=NULL; }
	};
	struct RetFaceConnect {
		List<Geometry::MeshData::Face>::Element *left,*right;
		RetFaceConnect() { left=NULL; right=NULL; }
	};

public:

	static uint32_t debug_stop_after;
	static Error build(const Vector<Vector3>& p_points,Geometry::MeshData& r_mesh);

};

#endif // QUICK_HULL_H