[Webkit-unassigned] [Bug 222790] WebGL2: Red flickering when using copyTexImage2D()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222790

--- Comment #1 from Kenneth Russell <kbr at google.com> ---
On my machine (2017 15" MacBook Pro, Intel HD 630 / AMD Radeon 560), the sprite flickers to black while hovering over the links on the left.

The texture copying code looks correct - it's doing the copy inside the requestAnimationFrame callback. Otherwise I might have guessed it was relying on undefined behavior, if preserveDrawingBuffer is set to the default false (haven't checked).

The behavior is quite strange. I don't know how other rendering work the browser is doing could interfere with the WebGL rendering in this way.

Could this have something to do with how the WebGLLayer publishes its textures to the compositor? Kimmo, can you reproduce?

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