[Mesa-dev] Request to revert commit [3d81e11b49366b5636b8524ba0f8c7076e3fdf34] mesa: remove, unnecessary, 'sort by year' for the GL extensions

Ian Romanick idr at freedesktop.org
Fri Sep 21 11:56:02 UTC 2018

On 09/20/2018 04:42 PM, Timothy Arceri wrote:
> On 20/9/18 11:09 pm, Ian Romanick wrote:
>> On 09/19/2018 11:36 PM, Federico Dossena wrote:
>>> As most of you are probably aware of, id2 and id3 games store GL
>>> extensions in a buffer that's too small for modern systems. This usually
>>> leads to a crash when MESA_EXTENSION_MAX_YEAR is not set, but what the
>>> creator of this commit didn't know is that some id3 games (the more
>>> "recent" ones) don't crash, they just truncate the string. As a result
>>> of this commit, these games can't detect some extensions and therefore
>>> don't work properly.
>> It sounds like the problem is still that MESA_EXTENSION_MAX_YEAR is not
>> set, so why not just set it?  Doesn't that fix the problem?
> There is no driconfig option for this currently. Personally I'd rather
> just sort the extensions (even if it was only for 32bit builds of Mesa)
> rather than adding a bunch of code and extra entry's into driconfig.
> Or are you saying you would prefer we do nothing and people should use
> MESA_EXTENSION_MAX_YEAR be required to use?

I was mostly trying to feel out the current (and possible future) extent
of the problem space.  I've never been fond of the by-year sorting, but
I don't hate it either.  My biggest annoyance is that it feels like
we've made a bunch of changes to this area over the years without really
thinking it through... and now we're back here.  I don't want to be back
here in another 2 years. :)

>>> I discovered this while trying to figure out why dynamic lights in Star
>>> Trek Voyager Elite Force (2000) suddenly broke with Mesa 18. I discussed
>>> this with Ronald Scheidegger, who's been very helpful and helped me
>>> figure out what was going on.
>>> Personally, I see nothing wrong with reverting this commit and keeping
>>> the extensions sorted by year, it doesn't impact performance and it
>>> doesn't break anything modern. What do you think about it?
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