1653595 - GLX partial present: Incorrect invalidation after video played once.

Status: RESOLVED DUPLICATE of bug 1640858

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

Description

[Darkspirit]

Attachment: Bildschirmvideo von 17.07.2020 16:47:59.webm

Gnome XWayland, Debian Testing, Intel HD Graphics 630 (KBL GT2)
mozregression --launch 20200717093907 --pref gfx.webrender.all:true gfx.webrender.max-partial-present-rects:1 -a https://www.youtube.com/watch?v=14yRFz8_iL8

1. Scroll down, click on "view replies", they are correctly shown.
2. Scroll up, play the video, scroll down, click on "view replies": Glitch. You need to scroll a bit to make them appear.
3. Scroll up, stop the video, scroll down, click on "view replies". Still a glitch.

Comment 1

[Darkspirit]

WebRender doesn't correctly report the invalidated region. You can clearly see the red area ends above the "View replies" button I'm clicking:
https://www.youtube.com/watch?v=Swosh3e4FYY (GLX/XWayland)
With steps from bug 1648872 comment 0 I enabled this partial present debug view on Gnome Wayland.
(On Gnome X11 this debug view doesn't seem to be as precise as on Wayland.)

Comment 2

[Darkspirit]

It seems to happen with elements you scroll into the viewport.

Comment 3

[Jan Alexander Steffens [:heftig]]

I suspect this might be the same underlying problem as bug 1640858.

Comment 4

[Darkspirit]

Attachment: Bildschirmvideo von 20.07.2020 21:17:48.webm

Screencast (Ctrl+Alt+Shift+R): Gnome Xwayland, Debian Testing
mozregression --launch 2020-07-20 --pref gfx.webrender.all:true gfx.webrender.max-partial-present-rects:1 -a https://docs.gitlab.com/ee/ci/yaml/README.html

GLX partial present:

1. Scroll the page a bit down, then scroll the right navigation down and up.
2. Bottom tiles are not updated. Only a part of the navigation scrolls.

Comment 5

[Robert Mader [:rmader]]

GLX partial present was removed again, so closing this.