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*                                                                         *
*           	Edward Garemo and Mattia Montanari  					  *
*					  University of Oxford 2019             			  *
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*                                                                         *
* This is the header file for the openGJK.c file. It defines the openGJK  *
*	function and it two important structures: bd and simplex.  	          *
*                                                                         *
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#ifndef __OPENGJK_H__ 
#define __OPENGJK_H__

#include <stdio.h>
#include <stdlib.h>
#include "math.h"

/**
* @brief Structure of a body.
*/
struct bd {
  int numpoints;    	/**< Number of points defining the body.            */
  double  s[3];    		/**< Support mapping computed last.                 */
  double  **coord;  	/**< Pointer to pointer to the points' coordinates. */
};


/**
* @brief Structure for a simplex.
*/
struct simplex {
  int    nvrtx;       	/**< Number of simplex's vertices. 					*/
  double vrtx[4][3];  	/**< Coordinates of simplex's vertices. 			*/
  int    wids[4];       /**< Label of the simplex's vertices. 			    */
  double lambdas[4];    /**< Barycentric coordiantes for each vertex.       */
};

/**
 * @brief The GJK algorithm which returns the minimum distance between
 * two bodies.
 */
extern double gjk(struct bd, struct bd, struct simplex *);

#endif