[Webkit-unassigned] [Bug 172969] New: Flickers when refreshing and moving a WebGL canvas

[bugzilla-daemon at webkit.org]

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

            Bug ID: 172969
           Summary: Flickers when refreshing and moving a WebGL canvas
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 10
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mbaclet at gmail.com
                CC: dino at apple.com

Created attachment 312066

  --> https://bugs.webkit.org/attachment.cgi?id=312066&action=review

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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