[Mesa-dev] [PATCH V2 10/11] genX/cmd_buffer: Enable fast depth clears

[Chad Versace]

On Tue 27 Sep 2016, Nanley Chery wrote:
> On Tue, Sep 27, 2016 at 11:00:21AM -0700, Chad Versace wrote:

> > As a consequence of that reasoning, we should set 3DSTATE_CLEAR_PARAMS.DepthClearValueValid = 1 
> > whenever hiz is enabled, even if we don't care about the actual clear value.
> 
> In the V3, I plan to emit that packet once at device initialization time
> HSW+, and to always emit it (in the expected location) for IVB/BYT. Only
> the latter platforms have the restriction that it must always be
> programmed with the other depth/stencil commands.

Is there any benefit to emitting it multiple times on ivb/byt? Does
emitting once during initialization, as for hsw, also work for ivb/byt?
If so, the code is cleaner if the two gens share the same workaround
code.