Bug 218282

Summary:

rendering to an offscreen framebuffer alterates canvas display

Product:

WebKit

Reporter:

zebontheweb

Component:

WebGL

Assignee:

Kimmo Kinnunen <kkinnunen>

Status:

RESOLVED DUPLICATE

Severity:

Blocker

CC:

dino, jdarpinian, kbr, kkinnunen, smoley

Priority:

Keywords:

DoNotImportToRadar

Version:

Safari 14

Hardware:

iPhone / iPad

OS:

Other

Bug Depends on:

218177

Bug Blocks:

Attachments:

Description	Flags
sample reproducing the pb	none

zebontheweb

Reported 2020-10-28 05:45:12 PDT

Created attachment 412522 [details] sample reproducing the pb See attached sample. 1/ create a canvas 2/ create an webgl context 3/ clear with black color 4/ create an offscreen framebuffer to render to a texture 5/ clear with black color in a setTimeout callback Result : the canvas switch to transparent Expected result : the canvas should remain black Maybe similar to https://bugs.webkit.org/show_bug.cgi?id=218177 or related bugs

Attachments
sample reproducing the pb (2.06 KB, text/html) 2020-10-28 05:45 PDT, zebontheweb	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Smoley

Comment 1 2020-10-28 10:54:15 PDT

I can reproduce this on an iPad running iOS 14 GM, but this appears to be fixed on the iOS 14.2 Beta https://developer.apple.com/news/releases/?id=10132020b Are you able to reproduce this on the latest beta build as well?

Kenneth Russell

Comment 2 2020-10-28 11:01:33 PDT

I think this is a duplicate of Bug 218177 which Kimmo just fixed. Kimmo, can you confirm?

zebontheweb

Comment 3 2020-10-28 15:05:49 PDT

(In reply to Smoley from comment #1) > I can reproduce this on an iPad running iOS 14 GM, but this appears to be > fixed on the iOS 14.2 Beta > https://developer.apple.com/news/releases/?id=10132020b > > Are you able to reproduce this on the latest beta build as well? I will give it a try on the real scenario failing, give me some time, we have a restricted number of iOS devices. Thanks.

Kimmo Kinnunen

Comment 4 2020-10-29 01:14:58 PDT

Thanks for the report. With tip of the tree, the canvas is showing black on screen. Yes, this should be fixed by the fix in bug 218177. *** This bug has been marked as a duplicate of bug 218177 ***

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