Mastodawn

oh no...
I'm not sure I can actually do the NV12 planar output using 2 color attachments, because the UV part is half the height of of the Y part, does vulkan require color attachments to have the same size? I'd assume so since there is only one viewport...

maybe i gotta use multiple passes...

using nv12 as the output format is just a little insane like come on game *pokes it with a stick*

rk: could be an enum 14h ago

Okay so…you’re doing planar output. And Vulkan. And YUV color space?

This is very confusing to me. Especially the planar part.

@rk yes…

the YUV color space is the smallest problem, i can just convert between rgb and yuv easily, the problem is really the planar format

if a 4x4 RGB image is this:

8R8G8B 8R8G8B 8R8G8B 8R8G8B
8R8G8B 8R8G8B 8R8G8B 8R8G8B
8R8G8B 8R8G8B 8R8G8B 8R8G8B
8R8G8B 8R8G8B 8R8G8B 8R8G8B

a 4x4 NV12 image is like this:

8Y 8Y 8Y 8Y 
8Y 8Y 8Y 8Y 
8Y 8Y 8Y 8Y 
8Y 8Y 8Y 8Y
4U4V 4U4V 4U4V 4U4V
4U4V 4U4V 4U4V 4U4V

where each UV value corresponds to two vertically adjacent Y values

initially i missed this fact and thought it was a 1:1 UV <-> Y correspondence, which is why i considered multiple color attachments

rk: could be an enum 13h ago

So…I guess I missed the overarching context here. What are you doing that has planar graphics?

@rk it’s… related to the video processor MFT, which is a windows api to convert images (or streams of images, for deinterlacing, but that’s not relevant here) between different formats and/or crop, rotate etc. them… it’s a bit like imagemagick on crack

I’m dealing with a game that wants the output to be NV12

Video Processor MFT (Camerauicontrol.h) - Win32 apps

The video processor MFT is a Microsoft Media Foundation transform (MFT) that performs colorspace conversion, video resizing, deinterlacing, frame rate conversion, rotation, cropping, spatial left and right view unpacking, and mirroring.

rk: could be an enum 13h ago

Ah. You’re well beyond my expertise in this area then. If you were needing to deal with planar modes on an Amiga or with ILBMs (which I guess could actually be relevant?) I could help, but otherwise I’m well out of my bitdepth.

@rk i only learned this stuff yesterday

blobfoxupsidedown

(well, the entire planar stuff at least, i've been hacking on video processor mft for a while now, but never really had to touch dxvk/vulkan code for it)

rk: could be an enum 13h ago

Ah. You and I are about forty years out of sync. I definitely need to catch up but, if you’re interested in how we dealt with memory bandwidth limitations the original planar modes on the Amiga (and similarly vintaged systems) some spelunking might be fun.

rk: could be an enum 13h ago

Also there’s a signal synching joke just waiting to be made here.

@rk im really interested in that yea
i've also watched a bunch of videos about the N64 where the membus is very limited while the cpu is very powerful, so often it's better write smaller, less cpu-efficient code - not unrolling loops etc.
it also has to share the membus with the gpu

rk: could be an enum 13h ago

I am only casually interested in the N64, but it comes from an era where these sorts of things really mattered because you were designing your own bus/architecture.

Also, randomly, do you know @mothcompute ? If not, lemme introduce y’all. You’re both way smarter than I am at these sorts of low-level details and I would enjoy watching y’all nerd out.

@rk (pinging @mothcompute since the ping broke and editing posts doesn't change pings)

@rk (computers can be a bitch sometimes)

rk: could be an enum 13h ago

Computers were a mistake in general yes.

genius osdev 🏳️‍⚧️13h ago

@rk @lizzy i actually got a nintendo 64 a couple weeks back and im honestly so excited to write some mips iii for it once im done with my current project

rk: could be an enum 13h ago

@mothcompute @lizzy

(Obligatory “See MIPS Run” is the best CPU architecture book ever comment.)

rk: could be an enum 13h ago

@mothcompute @lizzy

(You both need to nerd out *here*. I’ve already done the Twitter migration. I’m not going to BlueSky too. I’m too old and tired.)

@rk @mothcompute i'm not going to bluesky either it's a VC funded centralized corpo algorithm platform (but painted in "woke" colors or whatever, idk why people fall for that), not sure what I'd want there

Amber (KittyGPT6.9)13h ago

@lizzy@social.vlhl.dev @rk @mothcompute i have a bsky but i use it exclusively to follow sex workers and porn artists. i follow some fedi people there but everyone's mostly inactive. the tech threads i see are deeply uninteresting to me and unlike here with my 100,000 character limit i am restricted and forced to split my paragraphs into like 5 individual replies. it stiffens my discussion because i have to focus on beginning and end sentences actually making sense as it transitions between replies. made a short post about a stephen king novel i have been reading and enjoyed the accuracy of minor details on... https://bsky.app/profile/puppygirlhornypost.bsky.zoner.work/post/3lniix5anj22c ended up feeling clunky and awkward no matter how much i tried to condense it

Amber (@puppygirlhornypost.bsky.zoner.work)

Never heard of KYO but kfor.com behaves similarly. At my hs anytime something "big" would happen like the time my friend passed out doing pull ups and had a seizure... they'd somehow immediately swarm campus alongside www.news9.com. so spot on the nose there. 2/2 https://www.news9.com/

Bluesky Social

@puppygirlhornypost2 @mothcompute @rk

unlike here with my 100,000 character limit i am restricted and forced to split my paragraphs into like 5 individual replies

the funny thing is I am anti character limit but you’re one of the few people who sometimes makes me consider that it could be a good idea

Amber (KittyGPT6.9)13h ago

@lizzy@social.vlhl.dev @mothcompute @rk reddit's 10k character limit is fine. hell? 5k is too.

@puppygirlhornypost2 @mothcompute @rk fun fact i got my gf to bump the character limit here twice so that I could post my lesbian vampire fics

but these days I just put them into a PDF on my website and link to it lol

Amber (KittyGPT6.9)12h ago

@lizzy@social.vlhl.dev @mothcompute @rk 300? when links are considered a fixed 32? im throwing hands

@puppygirlhornypost2 @mothcompute @rk it's the tiktokification of microblogging

genius osdev 🏳️‍⚧️12h ago

@lizzy @rk @puppygirlhornypost2 well to be fair its more that tiktok and vine before it are kind of the microblogging of youtube. microblogging in turn being the tiktokification of blogging

sodi, mallory, mira, olivia, em, luna, etc 12h ago

@lizzy@social.vlhl.dev @puppygirlhornypost2 @mothcompute @rk who else makes you consider character limits being a good idea

neocat_floof_cute

@sodiboo @mothcompute @rk @puppygirlhornypost2 i dunno but you definitely make me consider rate limits

sodi, mallory, mira, olivia, em, luna, etc 12h ago

@lizzy@social.vlhl.dev @mothcompute @rk @puppygirlhornypost2 HEY I ALREADY HIT MY OWN RATE LIMITS FREQUENTLY THANK YOU EVERY MUCH

@sodiboo @mothcompute @rk @puppygirlhornypost2 holy shit for real?

sodi, mallory, mira, olivia, em, luna, etc 12h ago

@lizzy@social.vlhl.dev @mothcompute @rk @puppygirlhornypost2 no I made it up lol I turned those to the lowest setting since forever the fuck ago.

though the default ratelimit would probably hate me

genius osdev 🏳️‍⚧️12h ago

@lizzy @sodiboo @rk @puppygirlhornypost2 i used to run into rate limits almost all the time until @lua i guess fixed it? i dont really know actually

lua 💫12h ago

@mothcompute @lizzy @sodiboo @rk @puppygirlhornypost2 i edited the rate limiting code and added many zeros for people who are my friends :3

@mothcompute @sodiboo @rk @puppygirlhornypost2 @lua this is now officially a hellthread btw

Amber (KittyGPT6.9)12h ago

@lizzy@social.vlhl.dev @mothcompute @sodiboo @rk @lua all my threads end up as a hell thread.

SPICY EVIL CAET🍬🍭🎄

@puppygirlhornypost2 @lua @mothcompute @sodiboo @rk @lizzy without ME?

blobfoxpleading

sodi, mallory, mira, olivia, em, luna, etc 12h ago

@CAETFOOD @puppygirlhornypost2 @lua @mothcompute @rk @lizzy@social.vlhl.dev HELLO CAETFOOD!!!!!

SPICY EVIL CAET🍬🍭🎄

@sodiboo @mothcompute @lua @rk @lizzy @puppygirlhornypost2 HIIIIIIIIIIIIIIII

SPICY EVIL CAET🍬🍭🎄

@sodiboo @mothcompute @lua @rk @lizzy @puppygirlhornypost2

@CAETFOOD @sodiboo @mothcompute @lua @rk @puppygirlhornypost2 @navi so what are yall up to this evening

sodi, mallory, mira, olivia, em, luna, etc 12h ago

@lizzy@social.vlhl.dev @mothcompute @rk @puppygirlhornypost2 @lua it's not a hellthread until add your oomfs from hell (LIZZY DO NOT)

sodi, mallory, mira, olivia, em, luna, etc 12h ago

@lizzy@social.vlhl.dev @mothcompute @rk @puppygirlhornypost2 @lua I'm never letting you live that down

Amber (KittyGPT6.9)12h ago

@sodiboo @lizzy@social.vlhl.dev @mothcompute @rk @lua bringing my oomf @navi@social.vlhl.dev

@puppygirlhornypost2 @lua @mothcompute @sodiboo @rk @navi oh gosh wifeyyy hiiiiii

@sodiboo @mothcompute @lua @rk @puppygirlhornypost2 this must be a core memory for you

sodi, mallory, mira, olivia, em, luna, etc 12h ago

@lizzy@social.vlhl.dev @mothcompute @lua @rk @puppygirlhornypost2 yes I'm traumatized

genius osdev 🏳️‍⚧️13h ago

@lizzy @rk as someone who actually is on bluesky yeah its not all that much. in my mind its just 2021 twitter for people who dont think 2021 twitter also sucked, minus even the saving graces like private accounts

genius osdev 🏳️‍⚧️12h ago

@lizzy @rk i think my posts that i bridge there keep showing up in the discover and custom 'tech' feeds because every now and then i get a reply from someone ive never seen before that sounds exactly like the stereotypical stackoverflow answer