Re: [GtkGLExt] off-screen rendering

[Stephane Popinet <s popinet niwa co nz>]

Hi,

> Hmm, this looks like the code I use. It works fine with nvidia cards (my
> two machines have nvidia cards), but crashes with others, apparently,
> see http://bugs.debian.org/452939.
>
> Thanks for the answer. I think I'll use OSMesa instead.

Yes, same problem here, although in my case it does not work with an
nvidia card with the nv driver (Ubuntu 6.06 LTS driver) but works with
the nvidia binary driver.

This is all really annoying, all the more since none of the calls return
an error message. The pixmap produced just looks like a weird screen
dump (with seemingly random windows being displayed). Since no error
message is returned there is no way to know whether the pixmap rendering
was successful or not (aside from looking at the pixmap).

So my question: is there a reliable way to check whether this offscreen
rendering is supported by the graphics card/driver or not?

I am also using osmesa which tends to show similar issues depending on
which version of the opengl library it is linked to.

So question number 2: Is there any way to get portable opengl offscreen
rendering working reliably?

Any thoughts on this will be greatly appreciated,

cheers

Stephane