If we can't clear all the buffers with pctx->clear() (say, for example,
because of ColorMask), push the buffers we *can* clear with pctx->clear()
first. Tilers want to see clears coming before draws to enable fast-
paths, and clearing one of the attachments with a quad-draw first
confuses that logic.
Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>