But Pickelsworth is right, OpenGL is the best graphics API, why would someone use an API which works only on Windows, since a big number of people would never use Windows. And Windows has really nothing which would give it the right to be the one-and-only operating system, although Microsoft seems to want us to believe so, since they make basically no effort to write software for Linux and Mac.
Good question ... perhaps because Linux will never get the drivers to see unified shader support at an acceptable speed until they understand two things? :-)
1. Intel does not, I repeat, NOT create 3D cards. Until recently they sent vertex shader stuff through bus to the CPU to emulate hell. So the fact that they offer opensource drivers actually means nothing to "3D support"
2. Until the dispute on binary drivers is fully resolved within the "rule maker teams", the chances that AMD or NV will feature a highly opted driver isn't that likely. Both offer some drivers but lets face the truth, the best of their unix drivers is actually not downloadable but fixed to some specific product series.
(ok there is still Mac which most likely will outrule Desktop Linux usage in the forseable future thanks to the KDE4 project for OSX as they will be able to have the best of both worlds which includes working 3d drivers actually.
Linux just tries to be too much like Windows and OSX without giving the needed stuff to compete with them on the productivity level *I've had to learn that once again when tryting to get Ubuntu 7.04 connecting to my D-LINK WPA2 wireless network which just won't work. XP SP2 does without any problems*)