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

[xscreensaver] / hacks / glx / dangerball.c

diff --git a/hacks/glx/dangerball.c b/hacks/glx/dangerball.c
index 621e70cdca9929b92adae478c304a16edeb2a058..7b709092580fd76e24434a116e7c3e3c59700194 100644 (file)
--- a/hacks/glx/dangerball.c
+++ b/hacks/glx/dangerball.c
@@ -336,7 +336,10 @@ draw_ball (ModeInfo *mi)
                  (y - 0.5) * 8,
                  (z - 0.5) * 15);
 
+    /* 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);
     glRotatef (x * 360, 1.0, 0.0, 0.0);