Bug 216915

Summary:	Test WebGL draw video to canvas software path on iOS
Product:	WebKit	Reporter:	Kimmo Kinnunen <kkinnunen>
Component:	WebGL	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	dino, kbr, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Other
Hardware:	iPhone / iPad
OS:	iOS 13
See Also:	https://bugs.webkit.org/show_bug.cgi?id=205734
Bug Depends on:	218970, 215908, 218637
Bug Blocks:	198948, 218971

Description Kimmo Kinnunen 2020-09-23 23:40:41 PDT

Test WebGL draw video to canvas software path on iOS

In bug 215908 we had a regression where webgl texImage2D with video did not produce output.
The problem was that GPU YUV->RGB codepath had a bug.
However, the software conversion codepath should have taken effect, but in fact just produced transparent texture.
Interestingly normal "MP4" file worked, where as a HLS stream did not. It's unsure if this is a factor.

The problem should have been caught with simulator testing and/or real hardware testing.

Comment 1 Radar WebKit Bug Importer 2020-09-30 23:41:17 PDT

<rdar://problem/69824545>

Comment 2 Kimmo Kinnunen 2020-11-16 00:36:50 PST

In bug 218637 we had a regression where texImage2D with video did not produce output.
The problem was that the video decoder produced a frame in a format that was unexpected by yuv->rgb conversion codepath. However, the software conversion codepath should have taken effect, but in fact just produced transparent texture.

Comment 3 Kenneth Russell 2020-11-17 11:31:03 PST

On Bug 218971 I just suggested to see also Bug 205734. A couple of the existing layout tests seem to have videos that (maybe accidentally) go down the software decoding path at least on macOS. It would be great to add some internal method to the WebKitTestRunner to force the software decoded path for testing purposes.