[Bug 109113] KHR-GL43.compute_shader.resource-texture fails with MCS fast clears disabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109113

--- Comment #2 from Nanley Chery <nanleychery at gmail.com> ---
(In reply to Kenneth Graunke from comment #1)
> Sagar also noted that hacking intel_miptree_alloc_aux to set memset_value =
> 0 instead of memset_value = 0xFF also makes the test pass.  (I also
> discovered 1/2/3 work, so basically any slice - just not "clear"...)
> 
> That was pretty surprising to me.

I wonder if we need to follow the restriction we assumed was only for CCS:

If Software wants to enable Color Compression without Fast clear, Software
needs to initialize MCS with zeros.

That restriction goes all the way back to HSW at least (before single sample
compression). Is this the only test that fails with fast clears disabled on CMS
surfaces?

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