[Mesa-dev] GL4.5 or bust...

Hi all, On 16 May 2016 at 01:32, Ilia Mirkin <imirkin at alum.mit.edu> wrote: > On Sun, May 15, 2016 at 8:25 PM, Martin Peres <martin.peres at free.fr> wrote: >> On 16/05/16 02:55, Jason Ekstrand wrote: >>> On May 15, 2016 2:01 PM, "Martin Peres" <martin.peres at free.fr >>> <mailto:martin.peres at free.fr>> wrote: >>> > >>> > On 15/05/16 23:54, Ilia Mirkin wrote: >>> >> >>> >> On Sun, May 15, 2016 at 4:32 PM, Dave Airlie <airlied at gmail.com >>> >> <mailto:airlied at gmail.com>> wrote: >>> >>> >>> >>> So I said this on irc over the weekend and it seemed like we had some >>> >>> consensus on holding off 12.0 until we could announce 4.5 on some >>> >>> hardware. This assumes the FP64 stuff is going in at least. >>> >>> >>> >>> So I decided to roll out the proposal here, which is that we finish >>> >>> GL4.5 features off for at least Skylake I think. >>> >>> >>> >>> So what is needed/missing: please add as you see fit. >>> >>> >>> >>> a) robustness - radeonsi has some bits of this. We need to get >>> >>> KHR_robustness bits, that I think Kayden has patches started for, and >>> >>> i965 needs to ensure it uses robust buffer stuff. I don't think this >>> >>> one in unobtainable. >>> >>> >>> >>> b) cull_distance - I merged something, it broke, I'll fix it today, >>> >>> job done. >>> >>> >>> >>> c) enhanced_layouts - So tarceri has posted patches, we know that to >>> >>> do it properly we probably need to rip up attribute packing and >>> >>> rewrite it, however if Kayden thinks what tarceri has done is >>> >>> functional enough for now, we could merge the final pieces and work on >>> >>> perfection later. >>> >>> >>> >>> d) SIMD32 for i965 compute shaders - this is probably the most unknown >>> >>> to me, curro says he's got some patches, that need to rebase onto FP64 >>> >>> when it lands, assuming he can do that, and reviewers can get on top >>> >>> of things, and we possibly only enable SIMD32 in the corner cases >>> >>> initially, it might be possible to get this landed. >>> >>> >>> >>> Have I missed anything? Should we go for it? >>> >> >>> >> The bugs that get triggered when you expose GL 4.3+ to UE4 games. Some >>> >> are ours, some are theirs. Someone needs to sign up for this work. >>> >> >>> >> Also, I'd like to mention that ES 3.2 is pretty close as well. But >>> >> probably not close enough to squeeze in here. Ian has started working >>> >> on the OES_shader_io_blocks bits of it (which IMO shouldn't be too bad >>> >> for someone who knows what all GLSL allows and what it doesn't), which >>> >> was the last remaining big chunk. I have preliminary patches for core >>> >> support of advanced blending, the rest should all be easy. >>> >> >>> >>> For radeonsi, I think the only other missing bit is qbo and >>> >>> clear_texture, which may or may not make it in time. >>> >> >>> >> I'm in favor of this plan. Nouveau should be ready for Fermi and >>> >> Kepler once Samuel's images patches for Fermi land (mostly reviewed, >>> >> had a couple of nits). Maxwell will be missing tess and images, and >>> >> it's unlikely that either of those will get done in a reasonable >>> >> period of time. I think we can just flip robustness on... probably not >>> >> meeting all the provisions of that spec, but ... meh. >>> >> >>> >> That said, we should put a cap on this timewise - if e.g. it becomes >>> >> clear that SIMD32 will take a long time (I think the biggest potential >>> >> issue of the batch), we should just cut a release. Maybe a 1 month >>> >> cap? >>> > >>> > >>> > Yeah, a cap of 1 month delay compared to the initial plan or 1 >>> > week after the driver reaching 4.5 in master, whatever happens >>> > first. >>> >>> I agree with a time limit if we're going to do this. Another suggestion >>> that had been made is to go ahead with the release and then plan to release >>> mesa 13 as soon as we get 4.5. I'm personally OK with either. >>> --Jason >>> >> Let's see if it would prevent some superstitious people from updating :p >> >> In any case, I agree with Jason. Mesa is released often-enough and things >> will get a little buggy as games suddenly start exercising mesa is funny >> ways. So, let's not rush it out if it cannot reach the quality needed and >> just release another major version when it is ready. > > Of course the way to discover that games/applications suddenly start > exercising mesa in funny ways is to do a release... a bit of a catch > 22, wouldn't you say? I don't think developers and the users of > mesa-git are really going to be enough to get all the kinks out. And > the RC period should be sufficient time to fix any major issues that > pop up. > Let's see if I can summarise: - People want to have a release with GL 4.5 capable driver(s) - Mesa releasing is on a time based model, not a feature one. - Saying "we must get these X things, no release until then, period" (GL 4.5 or bust) is just plain silly - If we amend ^^ to honour some timeline, than we may not reach the stated goad even with the imposed delay. - Parties interested in the original timeline, may miss, are too shy, etc. to say anything against this last minute change. How about we do the following: - Keep the plan as originally - As people are happy that we have 1-2 drivers covering GL version X, branch off/feature freeze and release a few weeks later. - Last but not least - let's try and bring up such discussions earlier, please ? If people have missed the earlier emails let me know we can improve on that. Don't just ignore them and shout at the last minute, please ? Thank you Emil