[Webkit-unassigned] [Bug 202835] New: Support eGPUs correctly in ANGLE backend

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202835

            Bug ID: 202835
           Summary: Support eGPUs correctly in ANGLE backend
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kbr at google.com
                CC: dino at apple.com, jdarpinian at gmail.com,
                    justin_fan at apple.com
            Blocks: 198948

WebKit's current WebGL implementation supports external GPUs (eGPUs) correctly, specifically when the browser window is moved from one screen to another driven by an eGPU. ANGLE doesn't currently contain the code required to let this work correctly (the associated CGLSetVirtualScreen calls, and others).

Investigation will be needed to understand how exactly to make this work. For example, should WebKit's code continue to register a CGDisplayRegisterReconfigurationCallback, and call into ANGLE via some new extension so ANGLE can set the CGL renderer ID of its internal CGLContextObj?

This is a blocker to switching to the ANGLE backend - it would be unfortunate to regress support for eGPUs.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=198948
[Bug 198948] Meta: use ANGLE as the backend for WebKit's WebGL implementation
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