#dri-devel on 2023-02-12 — irc logs at oftc.irclog.whitequark.org

2022-12-21 00:45 ChanServ changed the topic of #dri-devel to: <ajax> nothing involved with X should ever be unable to find a bar

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01:50 <alyssa> `(x + (x << 1)) << 3`

01:50 <alyssa> this sure is an interesting way of multiplying by 24 :p

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02:19 <alyssa> gfxstrand: Apparently AGX's bindless samplers are basically a heap with only 2048 entries (in general)

02:19 <alyssa> this seems sketchy. but https://www.gfxstrand.net/faith/blog/2022/08/descriptors-are-hard/ says that NVIDIA and Intel both do heap samplers so maybe it's not the end of the world

02:20 <alyssa> TexturesImagesSamplersBorder ColorsTyped buffersUBOsSSBOs

02:20 <alyssa> B/F B/F H/F B/F D D

02:21 <alyssa> ^ my current understanding of agx

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02:27 <alyssa> maxSamplerAllocationCount=2048 I guess

02:28 <alyssa> according to https://vulkan.gpuinfo.org/displaydevicelimit.php?name=maxSamplerAllocationCount&platform=all , 4000 is the popular value

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02:29 <alyssa> the lower limits are moltenvk

02:31 <alyssa> if we omit support for customBorderColor we could bump to 8192 potentially

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02:32 <alyssa> 2048 is the DX12 limit so I'm not too worried tbh

02:35 <alyssa> also unclear if we can do bindless writeable images, ugh

02:37 <alyssa> at least, Metal doesn't support it, and I'm not convinced the hardware does either. ugh

02:38 <alyssa> that one could be a real pickle.

02:38 <alyssa> We can read from images bindlessly, but I'm not convinced we can write.

02:38 <alyssa> obviously could lower to massive pile of address calculation + global store but that's not going to perform well

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02:49 <alyssa> no, I think there should be bindless image write support in here

02:50 <alyssa> if we can figure out the encoding anyway

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02:52 <jenatali> alyssa: We're actively bumping to 4000 because that's the min-required value for the Vulkan spec

02:52 <jenatali> If you look at the limits tables at the end of the spec

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02:53 <alyssa> jenatali: uff

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02:53 <jenatali> Custom border colors only need 32 though

02:54 <jenatali> IIRC

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02:55 * alyssa eyes

02:55 <alyssa> 4000 indeed, okay.

02:56 <jenatali> Yep

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02:56 <alyssa> how do people navigate the VK spec by the way?

02:56 <alyssa> neither the full pdf nor the hyperlinked web stuff seems to do it for me idk

02:57 <jenatali> The chunked html for me

02:57 <jenatali> The full spec is torture on a browser

02:58 <alyssa> like, https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VK_EXT_custom_border_color.html ?

02:58 <alyssa> oh https://registry.khronos.org/vulkan/specs/1.3-extensions/html/index.html ok

02:58 <jenatali> Yeah that

02:59 <alyssa> search feature doesn't seem to do full text there

02:59 <jenatali> Nope

02:59 <alyssa> vulkan is too big confirmed

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02:59 <jenatali> Yep

03:00 <alyssa> okay, so tentativelt we need to support 4000 regular samplers + 32 custom

03:00 <alyssa> ~33kb worth of samplers, that fits

03:01 <alyssa> (assuming I really do have the full 65k to work with)

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03:09 <zmike> I use pdf

03:09 <alyssa> what reader?

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03:09 <zmike> evince

03:09 * alyssa will give a try

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11:31 <DavidHeidelberg[m]> enunes: Hey! Does xwayland gets detected correctly for you on CI?

11:37 <DavidHeidelberg[m]> (for VK apps)

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12:45 <enunes> DavidHeidelberg[m]: Xwayland seems to work for me, although I don't use it for VK, and the only caveat I know is currently if you start both Xorg and weston/Xwayland, CI will use Xorg

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14:28 <DavidHeidelberg[m]> enunes: I tried locally on weston, it seems to be some ANGLE quirk

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16:02 <dj-death> is there a NIR pass in charge of gather identical constants?

16:03 <dj-death> I've introduced a new intrinsic and I see that 2 of them are not getting "merged" into one, and I'm guessing it's because one of the source is a constant and that points to 2 different identical values

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16:04 <alyssa> dj-death: Shouldn't nir_opt_cse take care of that?

16:05 <dj-death> alyssa: thanks a lot, that's probably what I'm missing

16:05 <alyssa> make sure your intrinsics are [CAN_REORDER, CAN_ELIMINATE]

16:05 <alyssa> otherwise it's not valid to reorder and eliminate them => CSE can't touch them

16:06 <dj-death> yep, I have those

16:06 <dj-death> nope that's not doing it

16:06 <dj-death> I think it's because the 2 things are in different branches

16:07 <dj-death> one in the first if() { .. } block

16:07 <alyssa> yes, CSE doesn't handle that

16:07 <dj-death> the other in the else

16:07 <alyssa> you need global code motion for that (i.e. nir_opt_gcm) but it's... probleematic

16:07 <alyssa> I think Kayden was working on this area, they'll know more than I do :)

16:09 <dj-death> thanks

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17:05 <alyssa> I don't see how draw_vbo is supposed to work with indirect draws + user index buffers

17:07 <alyssa> oh that's just impossible, got it

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19:54 <gfxstrand> alyssa: Same as NVIDIA

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20:02 <alyssa> \o/

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20:55 <Kayden> dj-death: global value numbering in opt_gcm could take care of that. right now it's pretty limited but it could easily be extended

20:56 <Kayden> (as in, we just said, don't be too aggro and only do this limited set of things. just include the new thing in that whitelist)

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21:09 <alyssa> Kayden: what was the issue with full GVN, blowing up register pressure?

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21:16 <Kayden> I believe so, yeah.

21:16 <Kayden> I recently extended it to handle the case of if () { ... value ... } else { ... value ... } because value is live in both blocks anyway

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