[cairo] problem regarding cairo-gl

[Yogesh Gole]

> > Hi,
> >
> > I am using cairo-gl from
> > http://cgit.freedesktop.org/~anholt/cairo/tree/?h=gl<http://cgit.freedesktop.org/%7Eanholt/cairo/tree/?h=gl>
> ,
> >
> > and i tried to run cairo-perf, but while calling glGenFramebuffersEXT
> > (all gl extensions functions),
> >
> > It gives following error message and continues
> >
> > Mesa 7.0.3-rc2 implementation error: User called no-op dispatch
> > function (an unsupported extension function?)
> > Please report at bugzilla.freedesktop.org
>
> Sorry about that!  It's one of the things I noted before that needs to
> be fixed before it sees serious use -- the cairo-gl backend currently
> doesn't check for OpenGL extensions it uses.  My plan is to use GLEW, a
> nice[1] library that hides the pain of OpenGL extension handling.
>
> So, you need EXT_framebuffer_object and ARB_texture_non_power_of_two to
> use cairo-gl currently.  If you're using the Intel graphics driver,
> you'll get EXT_framebuffer_object once you update your kernel, 2D
> driver, and Mesa to something recent (I'd recommend 2.6.29.2, 2.7.0, and
> 7.4 respectively), and it'll be coming to Radeon with the KMS
> development by Dave Airlie and Jerome Glisse.
>
> The ARB_texture_non_power_of_two requirement could be relaxed with some
> minor work, and would let cairo-gl work on pre-915 hardware.
>
> [1] OK, GLEW is almost nice, except that it lacks a pkgconfig file.  So
> it's ugly to build against, but the C API you get in the end is what you
> always wished using OpenGL was like.  And I'll forgive just about
> anything to get that.
>
> --
> Eric Anholt
> eric at anholt.net                         eric.anholt at intel.com
>
>
>
Thanks for replying,
Now, it is working properly,

i ran cairo-perf and found that cairo-gl is slower than cairo-xrender/xlib
or cairo-glitz backend.

but i read from following link that cairo-gl backend is faster than
cairo-xrender.

http://lists.cairographics.org/archives/cairo/2009-March/016709.html

i am confused, please reply.

Yogesh G.
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