quick_hull.h

/*************************************************************************/
/*  quick_hull.h                                                         */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* 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.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
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/*************************************************************************/
#ifndef QUICK_HULL_H
#define QUICK_HULL_H

#include "aabb.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