[Mesa-dev] [PATCH 15/18] docs: Import extension spec for GLX_MESA_query_renderer

[Stéphane Marchesin]

On Thu, Nov 7, 2013 at 1:22 PM, Dave Airlie <airlied at gmail.com> wrote:

> On Sat, Oct 12, 2013 at 8:10 AM, Ian Romanick <idr at freedesktop.org> wrote:
> > From: Ian Romanick <ian.d.romanick at intel.com>
> >
> > The enumerated values are currently allocated from Intel's range.
>
> Some highlevel comments below,
>
>
> > +    GLX renderer attribute         number     description
> > +                                  of values
> > +    ----------------------        ---------   -----------
> > +    GLX_RENDERER_VENDOR_ID_MESA   1           PCI ID of the device
> vendor
> > +    GLX_RENDERER_DEVICE_ID_MESA   1           PCI ID of the device
>
> Okay PCI IDs might seem useful but we have a lot of situations where
> they aren't available,
>

I was thinking the same, but then noticed that it's an int, and a pci
device or vendor id is 16 bit, so you could implement this by returning the
pciid if you have it, or something > 0xFFFF if you don't have it (and sort
of make sure that those don't overlap).

Stéphane


> a) ARM devices generally don't have them
> b) nvidia generally espouse using PCI IDs in favour of a chip family
> ID they bake into the GPUs,
> nouveau doesn't even know the actual PCI IDs in userspace, we could
> find them but it does take a bit more work, like new kernel interface.
>
> > +
> > +    GLX renderer attribute        description
> > +    ----------------------        -----------
> > +    GLX_RENDERER_VENDOR_ID_MESA   Name of the renderer provider.  This
> may
> > +                                  differ from the vendor name of the
> > +                                  underlying hardware.
> > +    GLX_RENDERER_DEVICE_ID_MESA   Name of the renderer.  This may
> differ from
> > +                                  the name of the underlying hardware
> (e.g.,
> > +                                  for a software renderer).
> > +
> > +    If <attribute> is not a recognized value, NULL is returned, but no
> GLX
> > +    error is generated.
> > +
> > +    The string returned for GLX_RENDERER_VENDOR_ID_MESA will have the
> same
> > +    format as the string that would be returned by glGetString of
> GL_VENDOR.
> > +    It may, however, have a different value.
>
> Any reason for the value to be different here? Like a use case?
> > +    14) Why not make the queries from issue #14 GL functions (instead
> of GLX)?
> > +
>
> from issue 14? this is issue 14
>
> Dave.
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