[Webkit-unassigned] [Bug 270465] New: Vision Pro incorrectly applies gamma in WebXR session

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=270465

            Bug ID: 270465
           Summary: Vision Pro incorrectly applies gamma in WebXR session
           Product: WebKit
           Version: Safari 17
          Hardware: Vision Pro
                OS: visionOS
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebXR
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nb at 8thwall.com

Created attachment 470163

  --> https://bugs.webkit.org/attachment.cgi?id=470163&action=review

Non-immersive and immersive colors differ with the same shader.

When entering a WebXR session on vision pro, the colors appear washed out, and transparent objects are not transparent enough.

This can be corrected with code like:

`color = pow(color, vec4(2.2, 2.2, 2.2, 2.2))`

Note that it's important to correct the alpha channel in addition to the other color channels to get correct results.

You can see the effect in the attached screenshots. Before entering a webXR session, the colors look too dark (because of the inverse gamma corretion), but they look correct now in the WebXR view using the same shaders.

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