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      1 /*
      2 Copyright (C) 1996-1997 Id Software, Inc.
      3 
      4 This program is free software; you can redistribute it and/or
      5 modify it under the terms of the GNU General Public License
      6 as published by the Free Software Foundation; either version 2
      7 of the License, or (at your option) any later version.
      8 
      9 This program is distributed in the hope that it will be useful,
     10 but WITHOUT ANY WARRANTY; without even the implied warranty of
     11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
     12 
     13 See the GNU General Public License for more details.
     14 
     15 You should have received a copy of the GNU General Public License
     16 along with this program; if not, write to the Free Software
     17 Foundation, 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 
     24 cvar_t	chase_back = CVAR2("chase_back", "100");
     25 cvar_t	chase_up = CVAR2("chase_up", "16");
     26 cvar_t	chase_right = CVAR2("chase_right", "0");
     27 cvar_t	chase_active = CVAR2("chase_active", "0");
     28 
     29 vec3_t	chase_pos;
     30 vec3_t	chase_angles;
     31 
     32 vec3_t	chase_dest;
     33 vec3_t	chase_dest_angles;
     34 
     35 
     36 void 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 
     44 void Chase_Reset (void)
     45 {
     46 	// for respawning and teleporting
     47 //	start position 12 units behind head
     48 }
     49 
     50 void 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 
     60 void 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