[Webkit-unassigned] [Bug 162604] New: WebGL: drawingBuffer problems with Ultra HD Resolutions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=162604

            Bug ID: 162604
           Summary: WebGL: drawingBuffer problems with Ultra HD
                    Resolutions
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: michael.herzog at human-interactive.org
                CC: dino at apple.com

Steps to reproduce the problem:

1. First you need a high resolution monitor (e.g. iMac 5K)
2. Start Safari and maximize your window
3. Go to http://threejs.org/examples/webgl_interactive_cubes.html

What is the expected behavior?

When you position your mouse exactly over a cube, it should be highlighted.

What went wrong?

On ultrad HD resolutions the application is not able to determine the correct cube. This problem only occurs when Safari exceeds a specific resolution. On smaller monitors (e.g.FullHD), everything works fine.

Did this work before? 

No 

Details:

I assume that Webkit must be limiting the maximum drawing buffer width/height which leads to incorrect canvas sizes.

My recommendation is to change the backbuffer limit from e.g. 4k per dimension to 4k x 4k total area like Blink does (see https://bugs.chromium.org/p/chromium/issues/detail?id=445542)

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