RESOLVED WONTFIX254386
[ANGLE] Implement GL_ANGLE_metal_schedule extension 
https://bugs.webkit.org/show_bug.cgi?id=254386
Summary [ANGLE] Implement GL_ANGLE_metal_schedule extension
Dan Glastonbury
Reported 2023-03-23 18:13:47 PDT
In angleproject:7809 the default behavior of Flush() was changed to become a "no wait" instead of "wait for scheduled". This changes the semantics of Flush() on ANGLE compared to Apple OpenGL, meaning that Flush() can no longer to signal to the GPU the dependency of operations affecting IOSurfaces when working with multiple APIs, such as CoreGraphics. Instead of reverting the behavior change to Flush(), this change provides a way to ensure that all queued operations currently in the pipeline have had their resources readied and are waiting for the GPU to process them. Currently, Finish() is required to ensure these dependencies are met where Schedule() would suffice.
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Radar WebKit Bug Importer
Comment 1 2023-03-23 18:14:19 PDT
<rdar://problem/107163821>
Dan Glastonbury
Comment 2 2023-03-23 18:20:59 PDT
Pull request: https://github.com/WebKit/WebKit/pull/11899
Kenneth Russell
Comment 3 2023-03-29 17:01:52 PDT
As mentioned on the pull request, https://github.com/WebKit/WebKit/pull/11899 , unfortunately our teams collided on this needed feature. It's already been implemented in ANGLE as the EGL extension EGL_ANGLE_wait_until_work_scheduled in https://bugs.chromium.org/p/angleproject/issues/detail?id=7890 . I think WebKit's copy of ANGLE has already rolled forward to pick up this extension. Does it suit your needs?
Dan Glastonbury
Comment 4 2023-03-29 17:03:38 PDT
Yes, I've project my work on top of EGL_ANGLE_wait_until_work_scheduled. I'll close this bug and PR.
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