https://bugs.freedesktop.org/show_bug.cgi?id=83510
--- Comment #9 from Henri Verbeet hverbeet@gmail.com --- (In reply to Marek Olšák from comment #8)
(In reply to Christoph Haag from comment #7)
I think in the new "Lightroom Interior" the blackness glitch is visible in a more interesting way: https://www.youtube.com/watch?v=R9N-srsF_Fg
I think I've tracked down what's causing the blackness in all Unreal Engine demos: Division by zero.
I didn't debug this of course, but it seems suspicious that this would depend on division be zero returning zero instead of infinity. I don't think any other driver for current hardware does that with GLSL. Are you sure there's not a subsequent multiplication by zero that depends on INF * 0 returning 0 instead of NAN?