795117 - Visible clipping on Toroid WebGL demo

Status: RESOLVED FIXED

(Core :: Graphics: CanvasWebGL, defect)

Description

[Loic]

Open Toroid demo: http://www.cs.cmu.edu/~rjhall/webgl/toroid_6.html
When the torus is animating, the animation clipping is visible with white pixels.
Uncheck 'Transmittance' and 'Reflectance' boxes to emphasize the issue.

Disabling HWA doesn't fix the issue.

m-c
good=2012-07-25
bad=2012-07-26
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=ef20925bc2a5&tochange=20db7c6d82cc

I suspect ANGLE r1242 update (Bug 774755) or Bug 776001.

Comment 1

[(mostly gone) XtC4UaLL [:xtc4uall]]

FWIW, less but still present Pixels are also visible without ANGLE 1267 using Native (webgl.prefer-native-gl;true) and they are also visible using ANGLE 1275 in Google Chrome Canary.

Comment 2

[Alice0775 White]

In local build
Last Good: e5e8d176ac96
First bad: 39c6cd95de25

Regressed by Bug 774755

Comment 3

[Alex Keybl [:akeybl]]

Tracking for now, but if this isn't a prevalent issue, we'll untrack for release.

Comment 4

[Alex Keybl [:akeybl]]

(In reply to Alex Keybl [:akeybl] from comment #3)
> Tracking for now, but if this isn't a prevalent issue, we'll untrack for
> release.

No dupes thus far. Benoit - are you concerned that this will be a major issues with MapsGL/Games?

Comment 5

[Benoit Jacob [:bjacob] (mostly away)]

Sorry, I didn't realize that this bug could affect MapsGL. What is the concern here?

Comment 6

[Benoit Jacob [:bjacob] (mostly away)]

So as far as I can tell, all what we know is that some page used to draw what it wanted to, and doesn't anymore.

We don't know if this is a regression, or if it's that the page is incorrect and the newer ANGLE is more strict.

If we did know that it was a ANGLE regression (i.e. that the page is correct), the good next step would be to file a ANGLE bug.

I still don't see any impact for any known-correct page, or any 'famous' page like MapsGL.

No need to track this.

Comment 7

[Alex Keybl [:akeybl]]

(In reply to Benoit Jacob [:bjacob] from comment #6)
> I still don't see any impact for any known-correct page, or any 'famous'
> page like MapsGL.

Yep - comment 4 was more of a question than a statement. Glad to hear this won't have any major user impact.

Comment 8

[Paul Pasca[Away. Please needinfo? Paul Oiegas [:pauloiegasSV]]]

User Agent: Mozilla/5.0 (Windows NT 6.1; rv:45.0) Gecko/20100101 Firefox/45.0
Build ID: 20160407164938

I have tested your issue on latest FF release (45.0.2), latest Nightly build (20160421030302) and managed to reproduce it. Chrome and IE have the same white pixels on the animation.

Comment 9

[Kelsey Gilbert [:jgilbert]]

(In reply to Paul Pasca[:PoollyMcklayn] from comment #8)
> User Agent: Mozilla/5.0 (Windows NT 6.1; rv:45.0) Gecko/20100101 Firefox/45.0
> Build ID: 20160407164938
> 
> I have tested your issue on latest FF release (45.0.2), latest Nightly build
> (20160421030302) and managed to reproduce it. Chrome and IE have the same
> white pixels on the animation.

Please post your about:support, and a screenshot of the artifacts if you can.

I cannot reproduce on Nightly Win10 w/NV.

Comment 10

[Paul Pasca[Away. Please needinfo? Paul Oiegas [:pauloiegasSV]]]

Attachment: Untitled.png

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Comment 11

[Loic]

A screenshot of the issue would be nice, I don't remember how the clipping was.

Comment 12

[Alice0775 White]

Attachment: screenshot what I saw on Firefox17.0a1

I can reproduce on the bad build(17.0a1).

However, It seems improved.
 * I almost imperceptible on Beta46 and later.
 * And It is much less than Chrome51 dev.

Comment 13

[Kelsey Gilbert [:jgilbert]]

I'm closing this unless it gets worse/is still bad.

Comment 14

[Paul Pasca[Away. Please needinfo? Paul Oiegas [:pauloiegasSV]]]

I've tested this on the latest release(45.0.2) and latest Nightly(48.0a1). The print screen was captured from 45.0.2 release and it is still reproducible. Is better that Chrome, but still an issue in Firefox. I don't believe that we should close this, until the issue is completely gone.