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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - WebGL: drawingBuffer problems with Ultra HD Resolutions"
href="https://bugs.webkit.org/show_bug.cgi?id=162604">162604</a>
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<th>Summary</th>
<td>WebGL: drawingBuffer problems with Ultra HD Resolutions
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>Safari 10
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<th>Hardware</th>
<td>Macintosh
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<th>OS</th>
<td>OS X 10.11
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>WebGL
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>michael.herzog@human-interactive.org
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<th>CC</th>
<td>dino@apple.com
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<pre>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 <a href="http://threejs.org/examples/webgl_interactive_cubes.html">http://threejs.org/examples/webgl_interactive_cubes.html</a>
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 <a href="https://bugs.chromium.org/p/chromium/issues/detail?id=445542">https://bugs.chromium.org/p/chromium/issues/detail?id=445542</a>)</pre>
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