[Bug 83510] Graphical glitches in Unreal Engine 4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83510

Marek Olšák <maraeo at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #16 from Marek Olšák <maraeo at gmail.com> ---
(In reply to Henri Verbeet from comment #11)
> (In reply to Marek Olšák from comment #10)
> > However, Tonga and later hardware doesn't have the legacy dx9 opcodes for
> > MUL, MAD, RCP, RSQ, and LOG and they must be emulated with a comparison (or
> > V_CLASS_F32 that returns whether it's NaN/+-Inf/Denorm/+-0/etc) +
> > conditional assignment. It's better to do the conditional assignment after
> > every RCP than after every MUL.
> 
> Interesting, I wonder how that works out for Direct3D 9 applications. I
> don't suppose there's a global switch instead like (at least some) Intel and
> NVIDIA hardware has?

Yes, there is. See the commit.

Fixed by Mesa commit 2150db4d5daad3781876254d2b440367afd756cd. Closing.

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