1689831 - [mesa/i965 11.2.2] Webrender - Bad rendering

Status: RESOLVED INCOMPLETE

(Core :: Graphics: WebRender, defect, P3)

Description

[newsmails]

Attachment: WebrenderBoxAroundTextEdit.png

User Agent: Mozilla/5.0 (X11; Linux i686; rv:85.0) Gecko/20100101 Firefox/85.0

Steps to reproduce:

Here are 2 tests to reproduce :
1/ on Firefox default page
2/ on this page : https://refactoring.guru/

My config :
Linux 5.10.11 32 bit
i686 Intel(R) Core(TM) i3-6100H CPU @ 2.70GHz GenuineIntel

Actual results:

1/ there is a box border around the text edits.
With this rendering, some pages are unreadable...

2/ the text in the left column is unreadable

See the attaches images Webrender*.png

Expected results:

1/ No box around the edits

2/ Texts readable !

See attaches images Opengl*.png

Comment 1

[newsmails]

Attachment: WebrenderBadRendering.png

Comment 2

[newsmails]

Attachment: OpenGlNoBoxAroundEdit.png

Comment 3

[newsmails]

Attachment: OpenGlCorrectRendering.png

Comment 4

[newsmails]

Attachment: about:support

Comment 5

[newsmails]

I activated webrender by setting gfx.webrender.all and gfx.webrender.enabled to true.
By default Opengl render is activated.

Comment 6

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

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 7

[Emilio Cobos Álvarez (:emilio)]

Does gfx.webrender.software=true fix this for you?

I think by default you shouldn't get OpenGL acceleration but (non-WebRender) software rendering. Can you attach your about:support information when stuff works? Thank you!

Comment 8

[newsmails]

Yes, it works fine with gfx.webrender.software=true

Sorry, you are right : OpenGL is not the default.

These 3 configs works : Default (Basic), Opengl, Webrender Software.
I attach the about:support files.

Only WebRender enabled by gfx.webrender.enabled=true does not work.

Comment 9

[newsmails]

Attachment: Ok_DefaultConfig.txt - Default config works fine

Comment 10

[newsmails]

Attachment: Ok_OpenGlConfig.txt - OpenGl config works fine

Comment 11

[newsmails]

Attachment: Ok_WebRenderSoftware.txt - Software WebRender config works fine

Comment 12

[Andrew Osmond [:aosmond] (he/him)]

The fact that it works in Software WebRender suggests that it might be driver related -- the glyph rasterization shouldn't be different. That is a fairly old Mesa. We currently only have it on for Mesa 18+ in release, and are trying 17+ in nightly now. Are you able to try something more recent to see?

Comment 13

[newsmails]

Sorry I cannot : I use the Slackware 14.2 and we are waiting for version 15 for a long time.
As OpenGL works I thought that it was not a driver problem.

Comment 14

[Andrew Osmond [:aosmond] (he/him)]

(In reply to newsmails from comment #13)

Sorry I cannot : I use the Slackware 14.2 and we are waiting for version 15 for a long time.
As OpenGL works I thought that it was not a driver problem.

When we use OpenGL compositing, we exercise a lot less of the driver code, so it is possible for that to work.

How about setting LIBGL_ALWAYS_SOFTWARE=1 in the environment when running Firefox to force llvmpipe? Do you still see the problem? Thanks!

Comment 15

[newsmails]

If LIBGL_ALWAYS_SOFTWARE exists (with =0 or =1) firefox crashs at start.
https://crash-stats.mozilla.org/report/index/97efb312-12c0-4bf2-87dc-806650210203

Comment 16

[Darkspirit]

(In reply to newsmails from comment #0)
Does this problem still occur with latest https://nightly.mozilla.org/ ?

Comment 17

[newsmails]

I had to upgrade my system so I can't test anymore. Sorry.

Comment 18

[Robert Mader [:rmader]]

Thanks.