/*
 * Portions of this file are copyright Rebirth contributors and licensed as
 * described in COPYING.txt.
 * Portions of this file are copyright Parallax Software and licensed
 * according to the Parallax license below.
 * See COPYING.txt for license details.

THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
*/

/*
 *
 * Lighting system prototypes, structures, etc.
 *
 */


#ifndef _LIGHTING_H
#define _LIGHTING_H

#include "maths.h"
#include "segment.h"

#ifdef __cplusplus

struct g3s_lrgb;
struct object;

#define MAX_LIGHT       0x10000     // max value

#define MIN_LIGHT_DIST  (F1_0*4)

extern fix Beam_brightness;
extern g3s_lrgb Dynamic_light[MAX_VERTICES];
extern object *old_viewer;

extern void set_dynamic_light(void);

// Compute the lighting from the headlight for a given vertex on a face.
// Takes:
//  point - the 3d coords of the point
//  face_light - a scale factor derived from the surface normal of the face
// If no surface normal effect is wanted, pass F1_0 for face_light
fix compute_headlight_light(vms_vector *point,fix face_light);

// compute the average dynamic light in a segment.  Takes the segment number
g3s_lrgb compute_seg_dynamic_light(int segnum);

// compute the lighting for an object.  Takes a pointer to the object,
// and possibly a rotated 3d point.  If the point isn't specified, the
// object's center point is rotated.
g3s_lrgb compute_object_light(objptridx_t obj,vms_vector *rotated_pnt);

// turn headlight boost on & off
void toggle_headlight_active(void);
void start_lighting_frame(struct object *viewer);

#endif

#endif /* _LIGHTING_H */