[Webkit-unassigned] [Bug 172969] Changes to a WebGL canvas and to layer transforms are not always synchronized

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172969

nate <deuces9ers at outlook.com> changed:

           What    |Removed                     |Added
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                 CC|                            |deuces9ers at outlook.com

--- Comment #11 from nate <deuces9ers at outlook.com> ---
(In reply to Manuel Baclet from comment #0)
> Created attachment 312066 [details]
> Video showing display artefacts
> 
> On https://manubb.github.io/Leaflet.PixiOverlay/ios.html , flicker occurs on
> the circle and the triangle with iOS 9.3.5 (iPhone 4S) and iOS 10.3.2 (iPad
> Air 2) when rendered in WebGL. 
> 
> The problem is not present on:
> - Fedora 25 (Chrome, Firefox, Opera)
> - MacOS 10.11 and 10.12 (Chrome, Firefox, Opera, Safari)
> - Chrome book with last Chrome version
> 
> The problem does not occur when using a canvas renderer as in:
> https://manubb.github.io/Leaflet.PixiOverlay/ios-canvas.html
> 
> A video showing the display artefacts is attached. 
>  
> (During a move, the WebGL canvas is translated and never refreshed. At the
> end of a move, its position is reset and its content is refreshed so that
> the geometries appear at their right places. Somehow, the canvas refreshing
> is not synchronized with the position update.)

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