1756929 - Rendering glitches on https://codepen.io/amit_sheen/pen/VwrMPgM (with mix-blend-mode: difference;)

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, defect)

Description

[Mayank Bansal]

use the build from here : https://hg.mozilla.org/integration/autoland/rev/fc2b3d6448bcc3575fffb1abc923e7e703aeef54

Go to https://codepen.io/amit_sheen/pen/VwrMPgM

Zoom on the page using pinch-to-zoom OR using the usual zoom method OR drag the code slider to resize the demo area

AR: glitches on the ball in the middle. (The glitches look cool, but its still a glitch :) )

Comment 1

[Mayank Bansal]

Attachment: about:support

Comment 2

[Mayank Bansal]

Attachment: bandicam 2022-02-24 11-30-50-329.mp4

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1749380

Comment 4

[Mayank Bansal]

Attachment: reduced_testcase.html

Comment 5

[Mayank Bansal]

A similar effect can be seen on https://codepen.io/amit_sheen/pen/YzxbwOx .

Comment 6

[Glenn Watson [:gw]]

When I try to load https://codepen.io/amit_sheen/pen/VwrMPgM I can't see any texture on the sphere, but only with latest m-c build (it works on a release build). I wonder if something else is broken in current m-c preventing me from seeing it.

I didn't see anything specifically wrong on https://codepen.io/amit_sheen/pen/YzxbwOx yet. I didn't repro on the reduced test case yet either, but maybe that relies specifically on pinch-zoom rather than page zoom?

Comment 7

[Mayank Bansal]

Attachment: bandicam 2022-02-25 07-26-55-652.mp4

Comment 8

[Mayank Bansal]

(In reply to Glenn Watson [:gw] from comment #6)

When I try to load https://codepen.io/amit_sheen/pen/VwrMPgM I can't see any texture on the sphere, but only with latest m-c build (it works on a release build). I wonder if something else is broken in current m-c preventing me from seeing it.

Not sure... I can see the textures on the latest Nightly, (maybe bug 1757045 ?)

I didn't see anything specifically wrong on https://codepen.io/amit_sheen/pen/YzxbwOx yet. I didn't repro on the reduced test case yet either, but maybe that relies specifically on pinch-zoom rather than page zoom?

You are right, that the latest nightly doesnt repro this.

Comment 9

[Glenn Watson [:gw]]

I still can't see that sphere texture, very odd - I'll see if it's fixed in the next merge to m-c, otherwise I'll dig a bit deeper.

In the mean time, there is a try build [1] with a regression fix that might be worth trying to see if it fixes the bug here (I don't think they're the same issue, but hard to say for sure at this stage).

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1757019#c12

Comment 10

[Mayank Bansal]

can also be seen on https://codepen.io/thebabydino/pen/eYEwodL .... either drag the code sliders horizontally, OR try to pinch-zoom OR zoom-out using "Ctrl"+"-"

Comment 11

[Glenn Watson [:gw]]

The link in https://codepen.io/thebabydino/pen/eYEwodL doesn't seem to render correctly for me at all even on load - no need to zoom or anything. I just see a flat shaded quad which is clearly wrong, so looks like a good test case, thanks.

Comment 12

[Glenn Watson [:gw]]

Attachment: mb1.html

Reduced test case of the mix-blend mode glitch from comment 10.

Comment 13

[Glenn Watson [:gw]]

Could you test if setting gfx.webrender.debug.force-picture-invalidation in about:config stops the issues for you locally (not a fix, just would narrow down where the bug is)?

Comment 14

[Mayank Bansal]

(In reply to Glenn Watson [:gw] from comment #13)

Could you test if setting gfx.webrender.debug.force-picture-invalidation in about:config stops the issues for you locally (not a fix, just would narrow down where the bug is)?

I could still repro the bug on all the example codepens when I set gfx.webrender.debug.force-picture-invalidation = False (and restarted nightly)

Comment 15

[Glenn Watson [:gw]]

I added a fix for a similar problem in https://bugzilla.mozilla.org/show_bug.cgi?id=1757201. Try build in https://treeherder.mozilla.org/jobs?repo=try&revision=422897f59ab4bb22f71da5d2c68426ebb86ab467 will have build artifacts if you want to test locally. Otherwise, that should land in nightly within a day or so and we'll see if it also resolves this bug.

Comment 16

[Mayank Bansal]

(In reply to Glenn Watson [:gw] from comment #15)

I added a fix for a similar problem in https://bugzilla.mozilla.org/show_bug.cgi?id=1757201. Try build in https://treeherder.mozilla.org/jobs?repo=try&revision=422897f59ab4bb22f71da5d2c68426ebb86ab467 will have build artifacts if you want to test locally. Otherwise, that should land in nightly within a day or so and we'll see if it also resolves this bug.

This build fixes all the codepen demos i had posted, and the testcase from bug 1757201. Thanks!

Comment 17

[Mayank Bansal]

This is fixed by bug 1757201

Comment 18

[Monica Chiorean]

I can not reproduce the issue on Win10 using build 99.0a1(20220223190530), I tried all 3 of the links and zoom is correct.
Can you please check if the issue is still reproducing on latest Beta 99.0b4 (https://archive.mozilla.org/pub/firefox/candidates/99.0b4-candidates/build1/win64/en-US/), thank you.

Comment 19

[Mayank Bansal]

this bug was filed for nightly, and was fixed in nightly. I dont use Beta, so cant test.

Comment 20

[Monica Chiorean]

(In reply to Mayank Bansal from comment #19)

this bug was filed for nightly, and was fixed in nightly. I dont use Beta, so cant test.

I will mark issue as verified on 100, based on your comment. Thank you.