https://bugs.winehq.org/show_bug.cgi?id=38480
--- Comment #2 from Sebastian Lackner sebastian@fds-team.de --- (In reply to Matteo Bruni from comment #1)
Had another quick look and I confirm that it seems to be a driver bug in that the driver doesn't report GL_EXT_copy_texture while obviously supporting glCopyTexSubImage3DEXT().
Did anyone report the bug to Nvidia already?
No, I haven't reported it yet. I am also not sure if it makes much sense because its apparently nothing unusual that drivers do not report all supported extensions. When you search for "was not found, but has the entry point" you'll find various reports created with GLview ( http://www.realtech-vr.com/glview/download.php ) where users have similar problems with all kind of driver / graphic card combinations. Thats why I decided to just revert the patch in Wine Staging, its not one bug which has to be fixed, but more like hundred of bugs. ;)