http://ftp.ksu.edu.tw/FTP/FreeBSD/distfiles/xscreensaver-4.23.tar.gz

[xscreensaver] / hacks / glx / gltrackball.h

diff --git a/hacks/glx/gltrackball.h b/hacks/glx/gltrackball.h
index 3d8ef667bca1a3bd9948308f7ad7f5faafa43b24..966db04a688a8a8f469a2112b416119d76641351 100644 (file)
--- a/hacks/glx/gltrackball.h
+++ b/hacks/glx/gltrackball.h
@@ -45,5 +45,9 @@ extern void gltrackball_rotate (trackball_state *);
 void gltrackball_mousewheel (trackball_state *ts,
                              int button, int percent, int horizontal_p);
 
+/* Return the quaternion encapsulated by the trackball state.
+ */
+extern void gltrackball_get_quaternion (trackball_state *ts, float q[4]);
+
 #endif /* __GLTRACKBALL_H__ */