http://bugs.winehq.org/show_bug.cgi?id=7585
--- Comment #21 from Andrew Charles Hurst a.hurst@shef.ac.uk 2008-03-08 13:03:20 --- Hi Timo, well since I filed this bug I've had discussions with Thunderbird: The problem is that pbo's are not implemented on older cards, because the current implementeation relies on GL_ARB_pixel_buffer_object.
Older cards (like my TNT2) do have GL_EXT_pixel_buffer_object, which does almost exaclty the same thing, but according to Roderick, with a little more housekeeping required. This would be the way to go.
Perhaps I should open another bug to explicitly state this, and pester Roderick/Stefan some more :)
See http://wiki.winehq.org/DirectDraw under 'Direct framebuffer access'.
Andy