OpenGL fix Mesa/DRI regression (resubmit)

[Roderick Colenbrander]

This is a resubmit with the proper patch attached. The last email contained 
one of my previous patches.

Regards,
Roderick Colenbrander

On Friday 25 August 2006 22:50, Roderick Colenbrander wrote:
> Hi,
>
> Yesterday I submitted a patch which fixed support for the closed source ATI
> drivers. The patch was tested on the ati drivers, the nvidia drivers and
> using plain mesa (without dri).
>
> The patch itself was correct but it still caused a regression in case of
> using Mesa + DRI. As I mentioned yesterday the GLX client version should be
> used in case of direct rendering. The client libGL then needs to implement
> the functions for the version it advertises. This is how it should work in
> theory.
>
> In case of Mesa + DRI the advertised client libGL version is 1.3 or 1.4 and
> the server version is 1.2. In case of the DRI regression the problem is the
> function glXQueryDrawable. This function is part of GLX 1.3 but Mesa
> implements it using a GLX Xserver request. Because the server version isn't
> 1.3 this fails. This is what caused a regression.
>
> The patch changes the way glXQueryDrawable is used. We now only dynamicly
> load it when the Xserver speaks GLX 1.3 or higher. The function is only
> used in a few lines of debugging related code, so it is not very critical.
> The function in question already checked if the function pointer was null
> and what the glx version was. I removed the glx version check as it isn't
> usefull because it can be the client glx version aswell.
>
> Regards
> Roderick Colenbrander
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