#ifndef __PHYSICS_MODELS_H
#define __PHYSICS_MODELS_H

/*
PHYSICS_MODELS.H

	Copyright (C) 1991-2001 and beyond by Bungie Studios, Inc.
	and the "Aleph One" developers.
 
	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program 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.

	This license is contained in the file "COPYING",
	which is included with this source code; it is available online at
	http://www.gnu.org/licenses/gpl.html

Tuesday, May 31, 1994 5:18:35 PM
*/

/* ---------- constants */

enum /* models */
{
	_model_game_walking,
	_model_game_running,
	NUMBER_OF_PHYSICS_MODELS
};

/* ---------- structures */

struct physics_constants
{
	_fixed maximum_forward_velocity, maximum_backward_velocity, maximum_perpendicular_velocity;
	_fixed acceleration, deceleration, airborne_deceleration; /* forward, backward and perpendicular */
	_fixed gravitational_acceleration, climbing_acceleration, terminal_velocity;
	_fixed external_deceleration;
	
	_fixed angular_acceleration, angular_deceleration, maximum_angular_velocity, angular_recentering_velocity;
	_fixed fast_angular_velocity, fast_angular_maximum; /* for head movements */
	_fixed maximum_elevation; /* positive and negative */
	_fixed external_angular_deceleration;
	
	/* step_length is distance between adjacent nodes in the actorÕs phase */
	_fixed step_delta, step_amplitude;
	_fixed radius, height, dead_height, camera_height, splash_height;
	
	_fixed half_camera_separation;
};

/* ---------- globals */

static struct physics_constants physics_models[NUMBER_OF_PHYSICS_MODELS];
const struct physics_constants original_physics_models[NUMBER_OF_PHYSICS_MODELS]=
{
	/* game walking */
	{
		FIXED_ONE/14, FIXED_ONE/17, FIXED_ONE/20, /* max forward, backward and perpendicular velocity */
		FIXED_ONE/200, FIXED_ONE/100, FIXED_ONE/180, /* acceleration, deceleration, airborne deceleration */
		FIXED_ONE/400, FIXED_ONE/300, FIXED_ONE/7, /* gravity, normal acceleration, terminal velocity */
		FIXED_ONE/200, /* external deceleration */
	
		(5*FIXED_ONE)/8, (5*FIXED_ONE)/4, 6*FIXED_ONE, (3*FIXED_ONE)/4, /* angular acceleration, deceleration, max */
		QUARTER_CIRCLE*FIXED_ONE/6, QUARTER_CIRCLE*FIXED_ONE, /* fast angular v, max */
		QUARTER_CIRCLE*FIXED_ONE/3, /* maximum elevation */
		FIXED_ONE/3, /* external angular deceleration */
	
		FIXED_ONE/20, FIXED_ONE/10, /* step delta, step amplitude */
		FIXED_ONE/4, (4*FIXED_ONE)/5, FIXED_ONE/4, (1*FIXED_ONE)/5, /* radius, height, dead height, viewpoint height */
		FIXED_ONE/2, /* splash height */
		FIXED_ONE/32 /* camera separation */
	},

	/* game running */
	{
		FIXED_ONE/8, FIXED_ONE/12, FIXED_ONE/13, /* max forward, backward and perpendicular velocity */
		FIXED_ONE/100, FIXED_ONE/50, FIXED_ONE/180, /* acceleration, deceleration, airborne deceleration */
		FIXED_ONE/400, FIXED_ONE/200, FIXED_ONE/7, /* gravity, normal acceleration, terminal velocity */
		FIXED_ONE/200, /* external deceleration */
	
		(5*FIXED_ONE)/4, (5*FIXED_ONE)/2, 10*FIXED_ONE, (3*FIXED_ONE)/2, /* angular acceleration, deceleration, max */
		QUARTER_CIRCLE*FIXED_ONE/6, QUARTER_CIRCLE*FIXED_ONE, /* fast angular v, max */
		QUARTER_CIRCLE*FIXED_ONE/3, /* maximum elevation */
		FIXED_ONE/3, /* external angular deceleration */
	
		FIXED_ONE/20, FIXED_ONE/10, /* step delta, step amplitude */
		FIXED_ONE/4, (4*FIXED_ONE)/5, FIXED_ONE/4, (1*FIXED_ONE)/5, /* radius, height, dead height, viewpoint height */
		FIXED_ONE/2, /* splash height */
		FIXED_ONE/32 /* camera separation */
	},
};

// Added for the convenience of the 1-2-3 Converter
uint8 *unpack_physics_constants(uint8 *Stream, physics_constants *Objects, size_t Count);
uint8 *pack_physics_constants(uint8 *Stream, physics_constants *Objects, size_t Count);
void init_physics_constants();

#endif
