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Otherwise the next streamout operation will overwrite GDS. This can be improved by tracking if there is a streamout operation in flight. Currently the driver unconditionally flushes but that doesn't matter much as NGG streamout is disabled by default. Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>