1879694 - [WebGPU] With dx12-no-readback enabled, flickering on a Babylon.js demo (https://playground.babylonjs.com/#BCU1XR#0)

Status: RESOLVED WORKSFORME

(Core :: Graphics: WebGPU, defect)

Description

[Mayank Bansal]

Use latest Nightly, enable webgpu
Enable the dx12-no-readback thingy
go to https://playground.babylonjs.com/#BCU1XR#0
From the top right, select "WEBGPU"

AR: The demo on the right flickers
ER: Not so

Comment 1

[Mayank Bansal]

Attachment: about:support

Comment 2

[Mayank Bansal]

Attachment: bandicam 2024-02-10 11-30-11-105.mp4

Comment 3

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

Set release status flags based on info from the regressing bug 1856787

:sotaro, since you are the author of the regressor, bug 1856787, could you take a look?

For more information, please visit BugBot documentation.

Comment 4

[Mayank Bansal]

Also repros with this demo : https://playground.babylonjs.com/#IQN716#9

Comment 5

[Sotaro Ikeda [:sotaro]]

With readback enabled, flickering did not happen. But rendering was not updated as expected.

Comment 6

[Sotaro Ikeda [:sotaro]]

(In reply to Sotaro Ikeda [:sotaro] from comment #5)

With readback enabled, flickering did not happen. But rendering was not updated as expected.

Created Bug 1880601 for it.

Comment 7

[Mayank Bansal]

Bug 1879692 has some crashes that repro on this page.

Comment 8

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

Set release status flags based on info from the regressing bug 1856787

Comment 9

[Sotaro Ikeda [:sotaro]]

With latest nightly, the problem is addressed for me.

Comment 10

[Sotaro Ikeda [:sotaro]]

Reopen by https://bugzilla.mozilla.org/show_bug.cgi?id=1880601#c2.

Comment 11

[Sotaro Ikeda [:sotaro]]

Attachment: patch - Disable recycling of remote texture

With the path, the flickering did not happen. At first, the model was rendered, then WebGPU rendering became just white.

Comment 12

[Sotaro Ikeda [:sotaro]]

Took Firefox Profiler during the flickering. The screenshots in the profiler seemed to show old obsoleted content.

https://share.firefox.dev/4ciDETW

Comment 13

[Sotaro Ikeda [:sotaro]]

As in Bug 1880601 comment 4, Babylon version 5.7.1.1 does not show the problem. Then the latest Babylon seemed to cause the problem when shader compile failed.

Comment 14

[Sotaro Ikeda [:sotaro]]

Finished investigation of the bug. Unassign myself from this bug.

Comment 15

[Erich Gubler [:ErichDonGubler] (he/him)]

This now works.