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Riding horses, hacking computers, phones and smartwatch.
pavel

Pavel Machek

Reply to @fell@ma.fellr.net
@fell @zaunz @postmarketOS Which camera is that? I was told mainline on 6T only supports macro camera and selfie...?
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pavel

Pavel Machek

Reply to @dos@librem.one
@dos But you only hexdumped first few pixels, right?

Is that buffer uncached or something?

I pushed current code to https://gitlab.com/tui/debayer-gpu .

Yes, with memcpy(), I'm getting same results as before. If I get rid of the memcpy(), and attempt to fwrite() the buffer directly, things actually slow down.

I can't easily connect gstreamer to that, I'm going through ramdisk for now. I'm using time ./ocam.py debayer for testing -- https://gitlab.com/tui/tui/-/blob/master/ucam/ocam.py?ref_type=heads
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pavel

Pavel Machek

Reply to @dos@librem.one
@dos Thanks for a patch. And yes, it makes the loop faster.. if you don't actually use the data. When used for loading/saving 720 images from the ramdisk, speed went from ~16 sec to ~21 sec.
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pavel

Pavel Machek

OnePlus 6 ma tri fotaky, 2 vzadu a jeden selfie. #oneplus6 #linuxphone #oneplus6t Ty dva vzadu maji dost podobny parametry, jeden z nich na mainlinu funguje, druhy bohuzel ne, selfie funguje taky; tak proc neni podpora v Megapixels a internet plny fotek? No, protoze ten co funguje je makro kamerka ktera neumi fotit na dalku. Aha. Zahada vyresena.

OnePlus 6 has three cameras – two on the back and one selfie camera.
#oneplus6 #linuxphone #oneplus6t
The two rear cameras have quite similar specs. One of them works on mainline, the other unfortunately doesn't. The selfie camera works too.
So why isn't there support in Megapixels and why isn't the internet full of photos?
Well, because the one that works is the macro camera, which can't focus at a distance.
Ah. Mystery solved.
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pavel

Pavel Machek

Reply to @jimmac@mastodon.social
@jimmac @jamesh Sounds quite useful as a timer :-).
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pavel

Pavel Machek

Opravuju ADSL modem... ten, co to schytal pri bource. Zatim jsem na opravu pouzil kondenzator z GME.cz (jeste jednou diky za trpelivost!), a papirovou karticku. Nechtelo se mi pajet, takze kondenzator je nasazen na nozicky toho vybuchleho. A ja bych mel brat sazky: Bude to fungovat?
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pavel

Pavel Machek

Reply to @MOOMANiBE@mastodon.social
@MOOMANiBE Ok, let's say that was an "interesting" hardware. And they probably had 'unlimited' ROM, so... yep, nice trick, but not even too crazy.
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pavel

Pavel Machek

Reply to @mkyral@mastodonczech.cz
@mkyral Na radaru vidim vodu na zapadni hranici a vic vody v nemecku. Horko bych si v tuto chvili neodvazil predpovidat. Teplomer zatim ukazuje nejakych 23C, coz odpovida datum z intenetu (21C).

pavel@duo:/data/l/k$ weather lkpr
Current conditions at Praha / Ruzyne, Czech Republic (LKPR) 50-06N 014-15E 365M
Last updated Jul 03, 2025 - 03:30 AM EDT / 2025.07.03 0730 UTC
Temperature: 77 F (25 C)
Relative Humidity: 47%
Wind: from the N (360 degrees) at 12 MPH (10 KT)

Muj odhad je ze dneska nebude tak silene vedro -- diky te vode.
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pavel

Pavel Machek

Reply to @dos@librem.one
@dos Thanks. That really looks like black magic on the first look. On second look, maybe it is not that bad. Let me take another look tommorow.
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pavel

Pavel Machek

Reply to @datenwolf@chaos.social
@datenwolf I believe I'm limited to OpenGL ES 2.0. Presumably hardware can do more but our current drivers can not, so we are stuck there.

On the other hand... #librem5 main sensor can not do 10bpp at the moment, due to missing drivers. So maybe we can focus on 8bpp, first. Probably ineffecient conversion is "good enough" too, as GPU is a bit overpowered for this job.
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pavel

Pavel Machek

Reply to @datenwolf@chaos.social
@datenwolf So linearization should be doable with functions, too. Small trouble is that it is sensor-dependent but ... we have enough mathematical tools to deal with that. Actual functions can be seen here: https://blog.brixit.nl/fixing-the-megapixels-sensor-linearization/
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pavel

Pavel Machek

Reply to @dos@librem.one
Yep, recent bwtest shows that (extremely simple) debayer is feasible, and possibly more. So far I integrated debayer-gpu + gstreamer, and I'm meeting the deadlines.
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pavel

Pavel Machek

Reply to @dos@librem.one
@dos Sorry, hero, that's dark magic behind my understanding. I see the words but don't understand the sentences. :-(

I'd need working example here. I got surprisingly far vibecoding this, but even robots have their limits.
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pavel

Pavel Machek

I, once again, believe that GPU on Librem 5 can be useful for debayering. #librem5 #linuxphone https://gitlab.com/tui/debayer-gpu/-/tree/master/bwtest?ref_type=heads
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pavel

Pavel Machek

Reply to @dos@librem.one
@dos If you have example of that, that would be welcome :-). That's not how megapixels work, at least.
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pavel

Pavel Machek

Reply to @mkyral@mastodonczech.cz
@mkyral @Creep73 Jo jo, protoze chyba "kernel muze havarovat kdyz mu dojde pamet ktera dojit nemuze" je stejne zavazna jako "remote root diky chybe v parsovani IP". To dava smysl!
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pavel

Pavel Machek

Reply to @mkyral@mastodonczech.cz
@mkyral @Creep73 A tak jasne, security je uzasna vymluva proc nekoho sikanovat.

Z duvodu bezpecnosti musite (dosadte zde). Napr. kdyz vas chcem spehovat, tak z duvodu bezpecnosti musite mit nasi aplikaci.

Mimochodem, vedeli jste ze CVE na kernel jsou generovane copy&paste a v podstate je to spam? :-(
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pavel

Pavel Machek

Reply to @mkyral@mastodonczech.cz
@mkyral @Creep73 O "security" se mluvi. Je potreba ji porad zduraznovat... ale doopravdy se bezpecnost moc nedela. Takze mluvi o bezpecnosti, a pak pouzivaji Windows. Plna huba bezpecnosti, a pak posilaji cast mailu podepsanou, a cast ne. (mbank napr.)
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pavel

Pavel Machek

Reply to @dos@librem.one
@dos It seems that ignoring half of green pixels is right thing to do at the moment: https://gitlab.com/tui/debayer-gpu/-/tree/master/bwtest?ref_type=heads "Normal" debayer is 40% too slow. (That's better than 5 times too slow, but still not good enough). If you can can get it to 24 loops in second, you'll become a hero :-).
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pavel

Pavel Machek

Reply to @robertfoss@mastodon.social
@robertfoss I know about that one, see gitlab.com:tui/debayer-gpu.git . I could not get that to anywhere near the required performance.
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