[Bug 33825] Splinter Cell: Conviction - glsl shaders error

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=33825

Henri Verbeet <hverbeet at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |UPSTREAM

--- Comment #11 from Henri Verbeet <hverbeet at gmail.com> 2013-06-25 06:09:39 CDT ---
(In reply to comment #9)
> Maybe the error message is not very accurate e.g. it's trying to use 3
> temporary registers in a single instruction which doesn't support it. Just
> random guesses since I don't know the details of that GPU.
> It might very well be a driver bug. Make sure your 32-bit drivers are up to
> date, if you're on a 64-bit distro.
> 
It's a driver bug. I looked into it for Split Second at some point, and IIRC
the compiler basically seemed to run out of "condition registers" for CMOV-like
instructions. It could be avoided by using explicit "if {} else {}" flow for
instructions like cnd and cmp, of course at the cost of generating worse code.
I wrote a testcase to reproduce it and submit to nvidia at the time, but nobody
cared. I could probably dig it somewhere out of my email archive if anyone
wants to try again, but I'm not holding my breath.

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