[Webkit-unassigned] [Bug 264081] iPhone displays the image when alpha channel is 0 at runtime only, the screenshot is OK

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=264081

--- Comment #3 from Kimmo Kinnunen <kkinnunen at apple.com> ---
Thanks for the report. I can repro it.
On iPad the rendering is ok until tab in a tab bar is activated so that the tab menu pops up. Then the compositing changes and the hidden image comes visible.

Might be that the texture doesn't somehow get the rgb *= a correctly or precision problem.

To workaround, you could use expression like:

  texel = texel.a == 0 ? vec4(0.) : texel;

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