From http://www.jwz.org/xscreensaver/xscreensaver-5.18.tar.gz

[xscreensaver] / hacks / glx / moebiusgears.c

diff --git a/hacks/glx/moebiusgears.c b/hacks/glx/moebiusgears.c
index bf38150cfe5e33d58073f4b3b44955cd71bedfeb..03381b70d6ae9b81849e34324230f0afadc2f77c 100644 (file)
--- a/hacks/glx/moebiusgears.c
+++ b/hacks/glx/moebiusgears.c
@@ -339,7 +339,10 @@ draw_mgears (ModeInfo *mi)
                   (y - 0.5) * 4,
                   (z - 0.5) * 7);
 
+    /* Do it twice because we don't track the device's orientation. */
+    glRotatef( current_device_rotation(), 0, 0, 1);
     gltrackball_rotate (bp->trackball);
+    glRotatef(-current_device_rotation(), 0, 0, 1);
 
     get_rotation (bp->rot, &x, &y, &z, !bp->button_down_p);