[Mesa-dev] [PATCH-RFC] autoconf: add --enable-{dri,glx,osmesa}

[Chia-I Wu]

On Tue, Jun 28, 2011 at 6:00 AM, Kenneth Graunke <kenneth at whitecape.org> wrote:
> On 06/27/2011 12:17 PM, Dan Nicholson wrote:
>>
>> On Sun, Jun 26, 2011 at 6:39 AM, Chia-I Wu<olvaffe at gmail.com>  wrote:
>>>
>>> From: Chia-I Wu<olv at lunarg.com>
>>>
>>> The idea is that DRI driver, libGL and libOSMesa are libraries that can
>>> be independently enabled, yet --with-driver does not allow us to easily
>>> do that, if not impossible.  This also matches what
>>> --enable-{egl,xorg,d3d1x} do for the respective libraries.
>>
>> I haven't read this in any detail, but I definitely like the idea.
>> When I originally wrote all this, I struggled to coordinate DRI vs.
>> GLX, and I didn't really bother with the EGL code that was mostly
>> experimental. This is much more coherently structured.
>>
>>> There are two libGL providers: Xlib-based and DRI-based.  They cannot
>>> coexist.  To be able to choose between them, --enable-xlib-glx is also
>>> added.
>>
>> This is the only part that kind of bugs me. It seems to me that the
>> --enable-dri and --enable-xlib-glx options aren't really symmetric. I
>> believe you'd need this to be --enable-dri-glx to really act as a
>> provider. I can see why you didn't do that since dri is a "provider"
>> to many of the APIs and would require a lot more hacking of
>> configure.ac. Is my understanding of that correct? I'm not as familiar
>> with the newer non-GL Mesa components.
>
> How does --enable-xcb ("use XCB for GLX") fit in?  I've been using that for
> ages.  Why isn't it the default these days?  XCB isn't exactly cutting edge,
> and I believe we already use it for some DRI2 stuff.  Is there some
> Xlib-based stuff that still needs to be converted?  Can we just kill
> Xlib-GLX entirely?
Xlib-based GLX (sources under $mesa/src/mesa/drivers/glx) is the faked
GLX, emulated with only core protocol.  I was not clear.  I just
thought that fake GLX sounded scary.

So --enable-xcb enables the use of XCB in DRI-based GLX
($mesa/src/glx).  It is relevant when GLX is enabled and DRI-based GLX
is chosen.

> I'm probably not understanding any of this...sorry :)
>
> --Kenneth
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