[Bug 52393] Sacred 2 Gold: Textures largely missing since 5.0-rc3

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52393

--- Comment #35 from Piotr Caban <piotr.caban at gmail.com> ---
(In reply to labre from comment #34)
> – Returning 0.0 instead of sign * 0.0 does not fix it.
The game still works for me when 0.0 is returned (even so it's incorrect).

> – Had the assumption, that the code flow might be changed by a floating
> exception, e.g. not returning 0.0, but unpatched always emits traces before
> and after the calculation. So I’m not sure, what the _control87 function
> does, even after looking up the Microsoft docs. Is there a way to catch
> occurring floating exceptions with gdb? I have no experience with it, but I
> could find some tutorials.
There are no floating point exceptions. First of all, 0.0 * (any integer)
should not cause any exceptions. Also the game is already masking all floating
point exceptions. The control87 call affects 2 things:
 - it may affect how compiler optimizes code
 - it changes precision mode

You can try checking following things:
 - maybe adding _control87(0, 0) call is enough to make the bug gone
 - instead of changing whole control word you can try setting only the
precision (_control87(_PC_64, _MCW_PC)), it's the only setting changed by the
game
 - please upload msvcr80.dll (or msvcr80.dll.so in case of non-mingw build)
from wine f99d307a3e1f9beb7fd9dc8892b5cfabbabf816b
 - change "return sign * 0.0" to "return sign==-1 ? -0.0 : 0.0"

Are you using any non-standard compilation options or CPU specific
optimizations?

-- 
Do not reply to this email, post in Bugzilla using the
above URL to reply.
You are receiving this mail because:
You are watching all bug changes.