#16005: webgl.min_capability_mode might be too minimal
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Reporter: | Owner: mikeperry
mikeperry | Status: assigned
Type: defect | Milestone:
Priority: normal | Version:
Component: Tor | Keywords: tbb-fingerprinting, tbb-usability-
Browser | website, ff38-esr, tbb-5.0a-highrisk,
Resolution: | GeorgKoppen201506R, TorBrowserTeam201507R,
Actual Points: | MikePerry201507
Points: | Parent ID:
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Changes (by gk):
* status: needs_review => assigned
Comment:
Replying to [comment:17 mikeperry]:
> Replying to [comment:15 gk]:
> > 1) I am a bit worried about not disabling the highp precision. Are we
sure that all GPUs support it? It seems to be optional:
https://community.arm.com/groups/arm-mali-graphics/blog/2013/05/29
/benchmarking-floating-point-precision-in-mobile-gpus (while this post is
mobile specific it might apply to the desktop world as well).
>
> Unfortunately highp precision seems to be required for this game to
avoid the flickering. On my mobile and desktop CPUs,
https://www.browserleaks.com/webgl lists the "Best Float Precision" for
both vertex and fragment shaders as [-2^27^, 2^27^] (23). I am not sure if
this is a function of highp or not, though. The browserleaks result didn't
seem to change for me when toggling the pref or with the patch. Does it
for you?
I get the same results (that is [-2^127^, 2^127^] (23)) on all of my
machines. We might actually be good with Tor Browser on desktop at least
but who knows. I opened #16473 to get some solid data.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16005#comment:23>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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