In some rare cases like L4D IIRC. However it's highly unlikely for the simple reason that most of Linux GPU drivers are inferior to Window's.
This was not using WINE.
It's possible they were playing L4D under wine before the "native" linux client was released.
(the native client still uses a DX -> GL translator for shaders IIRC. Valve open-sourced it.)
yes, toGL - but it's not actively developed anymore. It was Richard Geldreich's project if I recall correctly.
> It's possible they were playing L4D under wine before the "native" linux client was released.
I did play it under WINE before the native client was released, but the native one was faster.