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Quake/chase.c

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+/*
+Copyright (C) 1996-2001 Id Software, Inc.
+Copyright (C) 2002-2009 John Fitzgibbons and others
+Copyright (C) 2010-2014 QuakeSpasm 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.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+// chase.c -- chase camera code
+
+#include "quakedef.h"
+
+cvar_t	chase_back = {"chase_back", "100", CVAR_NONE};
+cvar_t	chase_up = {"chase_up", "16", CVAR_NONE};
+cvar_t	chase_right = {"chase_right", "0", CVAR_NONE};
+cvar_t	chase_active = {"chase_active", "0", CVAR_NONE};
+
+/*
+==============
+Chase_Init
+==============
+*/
+void Chase_Init (void)
+{
+	Cvar_RegisterVariable (&chase_back);
+	Cvar_RegisterVariable (&chase_up);
+	Cvar_RegisterVariable (&chase_right);
+	Cvar_RegisterVariable (&chase_active);
+}
+
+/*
+==============
+TraceLine
+
+TODO: impact on bmodels, monsters
+==============
+*/
+void TraceLine (vec3_t start, vec3_t end, vec3_t impact)
+{
+	trace_t	trace;
+
+	memset (&trace, 0, sizeof(trace));
+	SV_RecursiveHullCheck (cl.worldmodel->hulls, 0, 0, 1, start, end, &trace);
+
+	VectorCopy (trace.endpos, impact);
+}
+
+/*
+==============
+Chase_UpdateForClient -- johnfitz -- orient client based on camera. called after input
+==============
+*/
+void Chase_UpdateForClient (void)
+{
+	//place camera
+
+	//assign client angles to camera
+
+	//see where camera points
+
+	//adjust client angles to point at the same place
+}
+
+/*
+==============
+Chase_UpdateForDrawing -- johnfitz -- orient camera based on client. called before drawing
+
+TODO: stay at least 8 units away from all walls in this leaf
+==============
+*/
+void Chase_UpdateForDrawing (void)
+{
+	int		i;
+	vec3_t	forward, up, right;
+	vec3_t	ideal, crosshair, temp;
+
+	AngleVectors (cl.viewangles, forward, right, up);
+
+	// calc ideal camera location before checking for walls
+	for (i=0 ; i<3 ; i++)
+		ideal[i] = cl.viewent.origin[i]
+		- forward[i]*chase_back.value
+		+ right[i]*chase_right.value;
+		//+ up[i]*chase_up.value;
+	ideal[2] = cl.viewent.origin[2] + chase_up.value;
+
+	// make sure camera is not in or behind a wall
+	TraceLine(r_refdef.vieworg, ideal, temp);
+	if (VectorLength(temp) != 0)
+		VectorCopy(temp, ideal);
+
+	// place camera
+	VectorCopy (ideal, r_refdef.vieworg);
+
+	// find the spot the player is looking at
+	VectorMA (cl.viewent.origin, 1<<20, forward, temp);
+	TraceLine (cl.viewent.origin, temp, crosshair);
+
+	// calculate camera angles to look at the same spot
+	VectorSubtract (crosshair, r_refdef.vieworg, temp);
+	VectorAngles (temp, r_refdef.viewangles);
+	if (r_refdef.viewangles[PITCH] == 90 || r_refdef.viewangles[PITCH] == -90)
+		r_refdef.viewangles[YAW] = cl.viewangles[YAW];
+}
+