etnaviv: rs: fix slow/fast clear transitions

When a slow/fast/slow clear sequence is executed on a surface, the second
slow clear will not regenerate the clear command if the clear value of the
fast clear is the same as the one used for the second slow clear, as the
current stored surface clear value is the same as the new clear value.
The command generated on the first slow clear however may have used a
different clear value, which is now submitted unchanged to the hardware on
the second slow clear.

Fix this by only generating the clear command if there is no valid one
already. If we already have a valid clear command simply update the fill
value in that command with the new clear value. This has some marginal
overhead, but has been chosen over the alternative of adding more state by
remembering the last slow clear value.

Cc: mesa-stable
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34029>
1 file changed