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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Flickering Shadows in The Talos Principle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93594#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Flickering Shadows in The Talos Principle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93594">bug 93594</a>
from <span class="vcard"><a class="email" href="mailto:maraeo@gmail.com" title="Marek Olšák <maraeo@gmail.com>"> <span class="fn">Marek Olšák</span></a>
</span></b>
<pre>(In reply to Michel Dänzer from <a href="show_bug.cgi?id=93594#c9">comment #9</a>)
<span class="quote">> Note that AFAIK using things like derivatives in non-uniform control flow
> isn't supported by GLSL. What's the original GLSL shader?</span >
True.
The GLSL shader is using discard followed by fwidth. This is undefined
behavior.
Therefore, it's an application bug.
The easy workaround would be to disable register allocation in st/mesa to get a
quasi-SSA form and trivially move KILL_IF to the end of the shader if the app
is detected to be Talos Principle.</pre>
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