[Mesa-dev] [PATCH] st/dri: Default ALLOW_RGB10_CONFIGS to false on gallium as well.

[Mario Kleiner]

On 01/17/2018 05:49 AM, Marek Olšák wrote:
> On Wed, Jan 17, 2018 at 3:21 AM, Mario Kleiner
> <mario.kleiner.de at gmail.com> wrote:
>> On 01/16/2018 11:47 PM, Marek Olšák wrote:
>>>
>>> Why?
>>
>>
>> Because the bug reports i've seen so far seem to be not caused by something
>> specific to the i965 implementation, but by some other client application or
>> compositor being incompatible. Therefore i'd expect the same problems in
>> clients/compositors to happen with gallium drivers.
>>
>> E.g., the gnome-shell bugs happen on all 10 bit drivers. So it would make
>> sense for rgb10 to be off by default consistently on all drivers, but with
>> the ability to switch it on via drirc.
> 
> If we re-enable this in the future, current and older gnome shell will
> be broken, so is it even useful to disable it?
> 
> Marek
> 

I don't know what the right approach is here. It just felt right to make 
the default consistent across Mesa's drivers, regardless if that default 
is on or off, as far as i'm concerned. Without enabled by default 
there's no trigger for projects to fix their code. With it enabled we 
will get probably lots of bug reports from incompatible software that 
won't get fixed quickly. I wouldn't be surprised if most basic Wayland 
compositors apart from Weston would have trouble. Or much stuff that 
runs on new X-Server 1.19.6 or master with all those new 32 bpp 
compositing visuals exposed. I will do some testing on that sometime in 
the coming days.

We could also ship an updated drirc which sets it globally on and is 
easily user editable for debugging/working around stuff, and add app 
specific workarounds for applications we know already to be broken.

We should get that other patch, that you and Tapani already reviewed, 
into master before Mesa 18-rc1 is branched, so one can enable i965 rgb10 
support again via drirc for testing on Intel, also to simplify testing 
via the oibaf or padoka ppa's.

-mario