[Xcb] GLX

[Jeremy Kolb]

Jamey Sharp wrote:
> On Mon, Jan 17, 2005 at 09:54:44PM -0500, Patrick Guimond wrote:
> 
>>Jeremy Kolb wrote:
>>| I've decided to sit down and XCBify GLX.
>>
>>If you can make your current XCB-XML file and API code available on a
>>repository, I'll do my part on helping to port GLX to XCB.
> 
> 
> On Mon, Jan 17, 2005 at 10:19:21PM -0800, Barton C Massey wrote:
> 
>>Presumably the next piece is to wire the Mesa API to call
>>into this stuff instead of Xlib?
> 
> 
> So this evening I sat down for a while with Eric Anholt, who knows a lot
> more about 3D than I do, and we looked at how to re-write libGL to use
> XCB instead of Xlib. There are some straight-forward changes that both
> make the code a lot shorter and clearer, and make an XCB port easy. We
> were kind of amazed.
> 
> The big thing is that the Mesa folks have been moving toward doing code
> generation from an XML description of the GL protocol. Gee... Where have
> we seen *that* strategy before? Apparently this code generation so far
> has only been applied to the X server implementation, but it looks
> complete enough for a client-side libGL implementation too. (So far
> they've been using Python scripts to process the XML, which might not be
> a bad precedent to follow.)
> 
> That aside, re-factoring the Xlib macro invocations in libGL down to a
> small set of XCB-like functions would lead to a patch that I'd expect
> the Mesa developers to accept without too much argument; and of course
> the XCB port would be really easy then.
> 
> So Patrick and Jeremy: If you want a libGL on XCB, the first step is to
> grab the Mesa source from
> 	http://mesa3d.org/cvs_access.html
> and look at src/glx/x11 and src/mesa/glapi. Joining the mesa3d-dev list
> 	http://mesa3d.org/lists.html
> might not be a bad idea either. (I guess "idr" is the person responsible
> for the XML GL descriptions, for what it's worth.) Josh, obviously
> there's a lot you could contribute to this effort; I hope you could be
> available to answer questions, at least.
> 
> With great anticipation,
> --Jamey
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I spoke to idr when I was first looking at the GLX proto and checked out 
the python stuff.  I'm not entirely sure what you want us to do.  Would 
it be possible to meet on irc or something and discuss this? It is 
definitely something I would like to figure out.

Also, even if glx is broken (we have no way of testing yet so it doesn't 
really matter), should we still get it committed? It would make this 
easier I think.

Jeremy