Accelerated graphics questions (many!)

Rui T. C. Matos tiagomatos at
Sat Feb 18 01:19:31 GMT 2006

From: Jean-Eric Cuendet <jec at>

> Hi,
> Since Xgl is out, hardware accelerated is "the* topic out there!
> Would someone explain me exactly what is involved to get 3d acclerated?
> As I understand, there is OpenGL, which is a library (Mesa). It gives
> some 3d functions. Without 3d acceleration, the CPU do the hard job.
> But if we have a 3d card, then we need something to make that OpenGL
> fast. At this point things get harder to understand...
> There is first the DRI/DRM driver. What resides in kernel? DRM? Both?
> Is DRI only a shared library that is loaded by OpenGL? Or is it a kernel
> module?
> What is the GLX module? A wrapper around OpenGL/Mesa so it is accessible
> through X11?
> There are drm.ko and i915.ko modules in /lib/modules/... , what are they
> for? Is that the DRM or the DRI part of Intel 915 platform? Does that
> provide hardware accelerated for Intel GMA 915?

You desperately need to read this:

> What about integrating r200/r300 drivers in Ubuntu? They seem to provide
> accelerated 3d for ATI cards. Is there a non-free issue?

AFAIK they are free software. The problem I think is lack of stability, they are
pretty much hard edged code.

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