The primary purpose of this patch is to serialise draws from multiple threads,
without the overhead of extra flushes that "StrictDrawOrdering" imposes.
With additional work, offloading state processing and driver overhead to a
separate thread may also allow for improved performance in some applications,
but that's not a goal of this patch.
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>