[Bug 93594] Flickering Shadows in The Talos Principle

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Feb 17 16:51:46 UTC 2016


--- Comment #10 from Marek Olšák <maraeo at gmail.com> ---
(In reply to Michel Dänzer from comment #9)
> Note that AFAIK using things like derivatives in non-uniform control flow
> isn't supported by GLSL. What's the original GLSL shader?


The GLSL shader is using discard followed by fwidth. This is undefined

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.

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