1/*
2Copyright (C) 1996-1997 Id Software, Inc.
3
4This program is free software; you can redistribute it and/or
5modify it under the terms of the GNU General Public License
6as published by the Free Software Foundation; either version 2
7of the License, or (at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12
13See the GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program; if not, write to the Free Software
17Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
18
19*/
20// chase.c -- chase camera code
21
22#include "quakedef.h"
23
24cvar_t	chase_back = CVAR2("chase_back", "100");
25cvar_t	chase_up = CVAR2("chase_up", "16");
26cvar_t	chase_right = CVAR2("chase_right", "0");
27cvar_t	chase_active = CVAR2("chase_active", "0");
28
29vec3_t	chase_pos;
30vec3_t	chase_angles;
31
32vec3_t	chase_dest;
33vec3_t	chase_dest_angles;
34
35
36void Chase_Init (void)
37{
38	Cvar_RegisterVariable (&chase_back);
39	Cvar_RegisterVariable (&chase_up);
40	Cvar_RegisterVariable (&chase_right);
41	Cvar_RegisterVariable (&chase_active);
42}
43
44void Chase_Reset (void)
45{
46	// for respawning and teleporting
47//	start position 12 units behind head
48}
49
50void TraceLine (vec3_t start, vec3_t end, vec3_t impact)
51{
52	trace_t	trace;
53
54	memset (&trace, 0, sizeof(trace));
55	SV_RecursiveHullCheck (cl.worldmodel->hulls, 0, 0, 1, start, end, &trace);
56
57	VectorCopy (trace.endpos, impact);
58}
59
60void Chase_Update (void)
61{
62	int		i;
63	float	dist;
64	vec3_t	forward, up, right;
65	vec3_t	dest, stop;
66
67
68	// if can't see player, reset
69	AngleVectors (cl.viewangles, forward, right, up);
70
71	// calc exact destination
72	for (i=0 ; i<3 ; i++)
73		chase_dest[i] = r_refdef.vieworg[i]
74		- forward[i]*chase_back.value
75		- right[i]*chase_right.value;
76	chase_dest[2] = r_refdef.vieworg[2] + chase_up.value;
77
78	// find the spot the player is looking at
79	VectorMA (r_refdef.vieworg, 4096, forward, dest);
80	TraceLine (r_refdef.vieworg, dest, stop);
81
82	// calculate pitch to look at the same spot from camera
83	VectorSubtract (stop, r_refdef.vieworg, stop);
84	dist = DotProduct (stop, forward);
85	if (dist < 1)
86		dist = 1;
87	r_refdef.viewangles[PITCH] = -atan(stop[2] / dist) / M_PI * 180;
88
89	// move towards destination
90	VectorCopy (chase_dest, r_refdef.vieworg);
91}
92
93