[Webkit-unassigned] [Bug 228298] New: powerPreference

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=228298

            Bug ID: 228298
           Summary: powerPreference
           Product: WebKit
           Version: WebKit Local 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, kbr at google.com, kkinnunen at apple.com,
                    kpiddington at apple.com, marcin.ignac at gmail.com
        Depends on: 220843

Marcin Ignac indicates on Bug 220843 that in the current Safari Technology Preview (Release 128 (Safari 15.0, WebKit 16612.1.22.11.3)), on a dual-GPU system running macOS 11.5, the powerPreference implementation may not be working correctly.

Attached is a test case. Switch which powerPreference line is picked in order to see the difference.

The system does still perform a graphics mux (legacy behavior, from OpenGL) when "powerPreference: 'high-performance'" is chosen. The mux shouldn't be necessary with ANGLE's Metal backend. However, WebKit's unmasked renderer string doesn't itself provide enough information to know whether the discrete GPU is actually used on a dual-GPU system.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=220843
[Bug 220843] WebGL power preference and discrete/internal gpu selection implemented incorrectly with ANGLE
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