[Webkit-unassigned] [Bug 237906] After 15.4, WebGL renders to offscreen buffer, then back to on-screen, are super broken (strobing, flashing, wrong textures)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237906

--- Comment #15 from Kenneth Russell <kbr at google.com> ---
Thank you Tim Schaub for the minimal reproduction case.

I wasn't able to reproduce the flickering problem with https://play.skyweaver.net , even with Safari 15.4 on an M1 MacBook Pro; maybe a workaround was put in place in the game.

However - the suggested patch to gl-scissor-fbo-test.html definitely catches the bug, which is still present in both Safari 15.4 and Safari Technology Preview 141. It's fixed in top-of-tree ANGLE, which we'll try rolling into WebKit ASAP.

Integrating that improvement to the test in https://github.com/KhronosGroup/WebGL/pull/3393 .

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