/*
 * Copyright (C) 2002  Terence M. Welsh
 * Ported to Linux by Tugrul Galatali <tugrul@galatali.com>
 *
 * Implicit is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as 
 * published by the Free Software Foundation.
 *
 * Implicit is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef IMPCUBETABLE_H
#define IMPCUBETABLE_H

/****************************************

OpenGL coordinate system

         Y
         |
         |
         |
         |
         |
         /--------X
        /
       /
	  Z

Indices for vertices and edge on cube

          2-----6-----6
         /|          /|
        3 |        11 |
       /  1        /  9
      3-----7-----7   |
      |   |       |   |
      |   0-----4-|---4
      2  /       10  /
      | 0         | 8
      |/          |/
      1-----5-----5

*****************************************/

// corners
// left-right-bottom-top-far-near notation
#define LBF 0x01
#define LBN 0x02
#define LTF 0x04
#define LTN 0x08
#define RBF 0x10
#define RBN 0x20
#define RTF 0x40
#define RTN 0x80

class impCubeTable {
      public:
	// This table describes the sequence of edges to visit
	// in order to build triangle strips in a cube  There are
	// a maximum of 16 integers that can result from a cube
	// configuration.  We have 17 integers in each row so that
	// each row can end with a 0.  The zero signifies the end
	// of the data in each row.
	int **cubetable;
	// 256 x 6 array of true/false values.  For each of the 256
	// entries in the cubetable, this table indicates which
	// neighboring cubes will also contain parts of the surface.
	bool **crawltable;

	  impCubeTable ();
	 ~impCubeTable () {
	};

      private:
	// edge connectivity
	// This array defines which vertices are connected by each edge.
	int ec[12][2];

	// vertex connectivity
	// This array defines which edges extend from each vertex.
	int vc[8][3];

	int nextedge (int vertex, int edge);
	void addtotable (int row, int edgecount, int *edgelist);
	void makecubetable ();
	void makecrawltable ();
};

#endif
