Mittwoch, 24. September 2008

NVidia Driver Bug

Finally I was able to hunt down the bug that caused ugly artifacts with the new NVidia beta drivers, things like this:

It seems to be a race-condition in the driver, if we do something like this (however that would work, because we would use another, optimized code-path which doesn't trigger the bug):
g.setColor(yellow); g.fillRect(); g.setColor(red); g.fillRect();
It seems the driver doesn't make sure the setColor really finished before it starts with fillRect, so it could be that the second rect is not red, but also yellow.

http://www.nvnews.net/vbulletin/showthread.php?t=119910

Hopefully all that bug-hunting will soon lead to good drivers ;)

Update:

There were some doubts wether Xorg's software implementation is correct, as it differs with what the Intel driver currently does I filed a bug some time ago. Luckily the Intel driver will follow the software implementation, the Radeon driver already does as far as I know.
This change means that we can implement transformed blits a bit more efficiently, if no filtering is requested.

http://bugs.freedesktop.org/show_bug.cgi?id=16820

1 Kommentar:

Ronald hat gesagt…
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