Norman Vine writes:

 > Which is the FAST lane to the underlying video in that the Win32
 > Windowing manager is bypassed for this window < ie all the region
 > clipping code etc. > so the speedup is not a driver bug !

Under X11, DRI's approach seems to be to allow the window manager to
recalculate clipping only every few seconds.  If you obscure part of
the 3D window, then move the obscuring window, there is a noticable
lag before the part that had been obscured is redrawn.  This works
fine most of the time, unless a pop-up dialog from another app hits
the 3D window.


All the best,


David

-- 
David Megginson
[EMAIL PROTECTED]


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