[Mesa-dev] [PATCH 1/3] dri3_glx.c: Pass NULL DRI drawables into driver for None GLX drawables

[Zhang, Xiong Y]

Hi, Emil:
> > On 25 March 2015 at 08:05, Xiong Zhang <xiong.y.zhang at intel.com> wrote:
> > > GLX_ARB_create_context spec says:
> > > If either <draw> or <read> are not a valid GLX drawable, a
> > > GLXBadDrawable error is generated, unless <draw> and <read> are both
> > > None and the OpenGL version supported by <ctx> is 3.0 or greater.
> > >
> > > So when both <draw> and <read> are None, it could pass NULL drawable
> > > into driver instead of returing GLXBadDrawable.
> > >
> > I'm a bit fresh in the area, but where do we check that the OpenGL
> > version supported is 3.0 or greater ? Is there an assumption that all
> > dri2/3 modules support it ?
> 
> [Zhang, Xiong Y] the patch lack of checking of OpenGL version >= 3.0, I will add it.

[Zhang, Xiong Y] Since GL version is determined by dri drivers like i965, swrast, how could I get GL version in glx code ? 
Could you give me an extension example that how to implement gl version check in glx / egl code ?

thanks
> >
> > Cheers
> > Emil