On 03/02/2013 07:00 AM, Christoph Bumiller wrote:
On 02.03.2013 00:14, Ian Romanick wrote:
Since last September I've been gradually working on an extension to
let applications query information about the renderer before (and
after) creating a context. I've talked it over with a few ISVs and
with various other folks. I also gathered some input from folks at
FOSDEM after my talk there. After going through several iterations of
review and modification, I think it's finally ready for wider input.
Some of the earliest feedback that I got was that many ISVs really
like the interface that fills this niche on Mac OS. It's a pretty
nice API, and this API is modeled after it. There are, however, some
differences.
I've pasted the spec below so that people can provide in-line
comments. I've also pushed a branch with the spec and the initial
implementation. There are a few things potentially provided by the
spec that are not included in the initial implementation. I've
implemented a couple unit tests, and I have some piglit tests
in-progress.
http://cgit.freedesktop.org/~idr/mesa/log/?h=query-renderer
I'm mostly looking for input on the specification itself. Once this
is good, I will also add EGL support.
...
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
...
5) How can applications tell the difference between different
hardware
renderers for the same device? For example, whether the renderer
is the
open-source driver or the closed-source driver.
RESOLVED. Assuming this extension is ever implemented outside
Mesa,
applications can query GLX_RENDERER_VENDOR_ID_MESA from
glXQueryRendererStringMESA. This will almost certainly return
different strings for open-source and closed-source drivers.
Why would the "PCI ID of the device vendor" change with the driver ?
Hopefully the PCI ID wouldn't change, but the resolution of this issue
only applies to the string version of the query.
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).
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