1 files changed, 92 insertions, 0 deletions

diff --git a/apps/plugins/sdl/progs/quake/chase.c b/apps/plugins/sdl/progs/quake/chase.c
new file mode 100644
index 0000000000..23061e341a
--- /dev/null
+++ b/apps/plugins/sdl/progs/quake/chase.c
@@ -0,0 +1,92 @@
+/*
+Copyright (C) 1996-1997 Id Software, Inc.
+
+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_t  chase_up = {"chase_up", "16"};
+cvar_t  chase_right = {"chase_right", "0"};
+cvar_t  chase_active = {"chase_active", "0"};
+
+vec3_t  chase_pos;
+vec3_t  chase_angles;
+
+vec3_t  chase_dest;
+vec3_t  chase_dest_angles;
+
+
+void Chase_Init (void)
+{
+        Cvar_RegisterVariable (&chase_back);
+        Cvar_RegisterVariable (&chase_up);
+        Cvar_RegisterVariable (&chase_right);
+        Cvar_RegisterVariable (&chase_active);
+}
+
+void Chase_Reset (void)
+{
+        // for respawning and teleporting
+//      start position 12 units behind head
+}
+
+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);
+}
+
+void Chase_Update (void)
+{
+        int             i;
+        float   dist;
+        vec3_t  forward, up, right;
+        vec3_t  dest, stop;
+
+
+        // if can't see player, reset
+        AngleVectors (cl.viewangles, forward, right, up);
+
+        // calc exact destination
+        for (i=0 ; i<3 ; i++)
+                chase_dest[i] = r_refdef.vieworg[i] 
+                - forward[i]*chase_back.value
+                - right[i]*chase_right.value;
+        chase_dest[2] = r_refdef.vieworg[2] + chase_up.value;
+
+        // find the spot the player is looking at
+        VectorMA (r_refdef.vieworg, 4096, forward, dest);
+        TraceLine (r_refdef.vieworg, dest, stop);
+
+        // calculate pitch to look at the same spot from camera
+        VectorSubtract (stop, r_refdef.vieworg, stop);
+        dist = DotProduct (stop, forward);
+        if (dist < 1)
+                dist = 1;
+        r_refdef.viewangles[PITCH] = -atan(stop[2] / dist) / M_PI * 180;
+
+        // move towards destination
+        VectorCopy (chase_dest, r_refdef.vieworg);
+}
+