[Bug 13225] Sacrifice Demo: black square behind the mouse

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=13225





--- Comment #9 from Alexander Dorofeyev <alexd4 at inbox.lv>  2008-05-23 16:42:16 ---
Can someone confirm the hack is working, especially if so on non-nvidia
hardware? 

The frustrating thing about this bug is that as far as I can tell this hack
shouldn't make any difference by OpenGL 2.1 specs, because specification
suggests that alpha reference and fragment alpha are rounded to integers for
the purpose of comparison. I could understand the difference if it was doing
something like floor(), but if it's rounded then 1/255 and 1/255 + some very
small value shouldn't make difference. But it does, on my machine at least. I
would otherwise say it's a driver bug, but it's happening on nvidia, which
usually has a very correct opengl and also on other hardware, so maybe I'm not
reading specs right.

Another strange thing about it is I can't reproduce it in a test. The basic
functionality usually seems to work, but there must be something else in the
program that triggers it.


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