etnaviv: rework ZSA into a derived state
The ZSA state is not fully self contained, as other states (mostly shader using discard or writing depth information) have an influence on whether we can use early Z test/write. Rework the ZSA state into a derived state that gets updated whenever a new ZSA or SHADER state is bound. This way we can automatically enable/disable early Z as needed. Signed-off-by:Lucas Stach <l.stach@pengutronix.de> Reviewed-by:
Christian Gmeiner <christian.gmeiner@gmail.com> Part-of: <!7396>
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