[Bug 7284] Max Payne 2 light reflections on people are too bright and blocky

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=7284





--- Comment #28 from Alexander Dorofeyev <alexd4 at inbox.lv>  2009-03-28 17:34:41 ---
Created an attachment (id=20174)
 --> (http://bugs.winehq.org/attachment.cgi?id=20174)
rcp of 0 testcase

A while ago I spent some time debugging this, and as far as I can tell the
problem originates in the vertex shader, and it has something to do with taking
a reciprocal of zero (supposed to produce infinity afaik) then multiplying it
by zero. On windows this seems to result in a black color (i.e. zero) on wine -
white. And least this contributes a part of the problem, I believe.
Unfortunately I got busy / lazy and never finished fixing this. I'm trying to
look into it again now, put together a testcase for this. Renders a black quad
on windows and white quad on wine, on my machine. But this needs to be tested
on non-nvidia machines. This stuff with divide by zero - I'm not sure it's
well-defined behavior at all.


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