XGL and NVIDIA

TuffSoundinName · Posted: Tue Feb 28, 2006 6:38 am Post subject:

Hi. I recently tried compiling xgl also and it completely bombed out with the following error:

aidy · l33t Joined: 07 Apr 2005 Posts: 915

YAYAYAYAYAYAY!
OK, post me the output of "emerge glproto mesa glitz xgl -pv"

Tiger683 · Posted: Tue Feb 28, 2006 10:43 am Post subject:

TuffSoundinName · Posted: Tue Feb 28, 2006 12:47 pm Post subject:

Oops...must have missed that...LordMyth, here's the output of emerge -pv glproto mesa glitz xgl:

aidy · l33t Joined: 07 Apr 2005 Posts: 915

OK you just need to unmask all those packages.

Tiger683 · Posted: Tue Feb 28, 2006 12:55 pm Post subject:

TuffSoundinName:
Hanno's overlay is broken atm, use CoffeeBuzz ovrelay, that will enable you to update glproto to 1.4.5-r1, which solves your problem...
BTW. You'll have to rebuild mesa cairo xgl etc. after that
:sigh:
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huijar · n00b Joined: 03 Feb 2005 Posts: 10

Everything working perfect except for direct rendering. First I compiled everything with dri use flag, but didn't work though. Then I read from Hanno's blog that nvidia users should have -dri because the nvidia drivers have dri support of their own. Well, I recompiled xorg-server and xorg-x11 with -dri and re-emerged xf86-video-nv and nvidia-glx, but still not working. Do I have to recompile something else with -dri, or where is the problem?

aidy · l33t Joined: 07 Apr 2005 Posts: 915

you don't need xf86-video-nv, you need nvidia-kernel! And in your xorg.conf driver nvidia.

huijar · n00b Joined: 03 Feb 2005 Posts: 10

I already had nvidia-kernel, but I ended up trying to uninstall xf86-video-nv and reinstall nvidia-kernel and nvidia-glx. Still it doesn't work. I started to read the Xgl (part 2) thread, and there people are saying that Xgl doesn't even have dri support. So, is the dri part in the wiki just plain crap? Do I still have to struggle without my daily StepMania doses?

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TuffSoundinName · Posted: Tue Feb 28, 2006 7:47 pm Post subject:

Probably an obvious answer to this, but I couldn't find it. Can anyone tell me how to get CoffeeBuzz's overlay?

huijar · n00b Joined: 03 Feb 2005 Posts: 10

Checkout it from svn:

TuffSoundinName · Posted: Tue Feb 28, 2006 7:55 pm Post subject:

great, thanks.

aidy · l33t Joined: 07 Apr 2005 Posts: 915

Read teh wiki

huijar · n00b Joined: 03 Feb 2005 Posts: 10

Oh darn. The Xgl howto doesn't say anything about dri, it was the modular Xorg howto that had a note about the dri use flag. So is it true that Xgl does not have dri support? It would be a shame, for Xgl is really cool but I need direct rendering!
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TuffSoundinName · Posted: Tue Feb 28, 2006 8:25 pm Post subject:

huijar, I believe it's been said before (I may be wrong) but the nvidia drivers automagically provide DRI support, that's why you don't have to enable DRI in xorg.conf on regular xorg-x11, as it will do absolutely nothing. As for ATI cards and drivers, sorry folks!

huijar · n00b Joined: 03 Feb 2005 Posts: 10

But how come I've managed to get it off, if it should work automagically?

/me is confused
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aidy · l33t Joined: 07 Apr 2005 Posts: 915

have you enabled the glx module in your xorg.conf?

huijar · n00b Joined: 03 Feb 2005 Posts: 10

Yep

TuffSoundinName · Posted: Tue Feb 28, 2006 8:43 pm Post subject:

That was my second guess. Yes, enabling GLX in xorg.conf did it for me. Also, you need to do:

huijar · n00b Joined: 03 Feb 2005 Posts: 10

And yes, I use the nvidia opengl interface... What the hell could be wrong...
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aidy · l33t Joined: 07 Apr 2005 Posts: 915

Heh, now that you bring it up, I infact don't have any direct rendering either. I don't think it's possible with Xgl if you use nvidia drivers.

huijar · n00b Joined: 03 Feb 2005 Posts: 10

If I understood anything about one guy's explanation in IRC, Xgl supports direct rendering on nvidia, because nvidia drivers have an implementation of direct rendering of their own. So Xgl is direct rendered, but running applications that think that they can only go direct isn't possible. For example an opengl "dancing" game stepmania wants direct rendering, because before it was the only accelerated rendering method. In Xgl also indirect rendering is accelerated, so in theory the applications don't need direct rendering anymore, but they still insist it... In conclusion, everything is accelerated in Xgl when using nvidia drivers, but some applications just don't know it and keep asking for direct rendering. (Or that's what I understood, correct me if I'm wrong)
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CoffeeBuzz · Posted: Tue Feb 28, 2006 9:53 pm Post subject:

You won't get direct rendering with nvidia until they implement GLX_texture_from_pixmap extension in their driver ... I think.

But don't get me to explain indirect/direct vs accel/nonaccel ... it makes my head spin thinking about it

I've started compiling information to start an FAQ, less one exists thats non-technical enough for the lay-person.
Every 10 seconds its discussed in #xgl on freenode too so just stop by there and say something with the word "indirect" or "accelerated" in the sentance and i'm sure someone will pipe up with an explaination (i make no gauruntees it will be right however heh)

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TuffSoundinName · Posted: Tue Feb 28, 2006 10:04 pm Post subject:

EDIT: Never mind. In that case, shouldn't applications be able to use either? I mean, they'll have to, once Xgl goes mainstream and replaces the old and, in my opinion, deprecated Xserver. I guess developers are going to have some work to do...

Correct me if I'm mistaken, but basically, huijar, are you saying that direct rendering is enabled, but most applications that require it and only it cannot see it?