/*
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SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
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FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.  
COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
*/
/*
 * $Source: f:/miner/source/main/rcs/physics.h $
 * $Revision: 2.0 $
 * $Author: john $
 * $Date: 1995/02/27 11:33:06 $
 * 
 * Headers for physics functions and data
 * 
 * $Log: physics.h $
 * Revision 2.0  1995/02/27  11:33:06  john
 * New version 2.0, which has no anonymous unions, builds with
 * Watcom 10.0, and doesn't require parsing BITMAPS.TBL.
 * 
 * Revision 1.29  1995/02/06  19:47:18  matt
 * New function (untested), set_thrust_from_velocity()
 * 
 * Revision 1.28  1994/12/04  22:14:20  mike
 * apply instantaneous rotation to an object due to a force blow.
 * 
 * Revision 1.27  1994/08/01  13:29:42  matt
 * Made fvi() check holes in transparent walls, and changed fvi() calling
 * parms to take all input data in query structure.
 * 
 * Revision 1.26  1994/07/28  12:35:22  matt
 * Added prototype
 * 
 * Revision 1.25  1994/07/13  21:48:05  matt
 * FVI() and physics now keep lists of segments passed through which the
 * trigger code uses.
 * 
 * Revision 1.24  1994/06/30  19:01:55  matt
 * Moved flying controls code from physics.c to controls.c
 * 
 * Revision 1.23  1994/06/16  14:14:20  mike
 * Change physics_lookahead to return hit_info.
 * 
 * Revision 1.22  1994/06/09  09:58:43  matt
 * Moved find_vector_intersection() from physics.c to new file fvi.c
 * 
 * Revision 1.21  1994/05/20  16:11:07  matt
 * Added new parm, ignore_obj, to find_vector_intersection()
 * 
 * Revision 1.20  1994/05/20  15:16:58  matt
 * Added new fvi return type; took out some troublesome (and troubling) asserts
 * 
 * 
 * 
 */

#ifndef _PHYSICS_H
#define _PHYSICS_H

#include "vecmat.h"
#include "fvi.h"

//#define FL_NORMAL  0
//#define FL_TURBO   1
//#define FL_HOVER   2
//#define FL_REVERSE 3

//these global vars are set after a call to do_physics_sim().  Ugly, I know.
//list of segments went through
extern int phys_seglist[MAX_FVI_SEGS],n_phys_segs;

// Read contrls and set physics vars
void read_flying_controls( object * obj );

//Simulate a physics object for this frame
do_physics_sim(object *obj);

//tell us what the given object will do (as far as hiting walls) in
//the given time (in seconds) t.  Igores acceleration (sorry) 
//if check_objects is set, check with objects, else just with walls
//returns fate, fills in hit time.  If fate==HIT_NONE, hit_time undefined
//	Stuff hit_info with fvi data as set by find_vector_intersection.
//for fvi_flags, refer to fvi.h for the fvi query flags
int physics_lookahead(object *obj,fix t,int fvi_flags,fix *hit_time, fvi_info *hit_info);

//Applies an instantaneous force on an object, resulting in an instantaneous
//change in velocity.
phys_apply_force(object *obj,vms_vector *force_vec);
phys_apply_rot(object *obj,vms_vector *force_vec);

//this routine will set the thrust for an object to a value that will
//(hopefully) maintain the object's current velocity
set_thrust_from_velocity(object *obj);

#endif