[gentoo-user] Xgl and direct rendering

[gentoo-user] Xgl and direct rendering

[Jan Stępień]

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Hi everyone,

I've been using Xgl for quite a long time without any serious problems.
Recently I've tried to launch America's Army (emerged one, version
2.5.0) on my box, but...

~ armyops
Xlib:  extension "XFree86-DRI" missing on display ":1.0".
Cheat protection disabled
open /dev/[sound/]mixer: No such file or directory
WARNING: ALC_EXT_capture is subject to change!
Either GL_EXT_bgra or glDrawRangeElements not supported- bailing out.
History:
Exiting due to error

Being quite disappointed I verified the first line of the output above
with glxinfo. And so...

~ glxinfo
name of display: :1.0
Xlib:  extension "XFree86-DRI" missing on display ":1.0".
display: :1  screen: 0
direct rendering: No
<snip>

It sounds rather unbelievably. I've got running Xgl with Beryl's
dazzling animations and I'm informed that despite having over 4000 FPS
on glxgears I have not got direct rendering. What the...?

Few days later I've accidentally launched Xorg (using startx script)
instead of my Xgl. When I entered my old, two-dimension desktop I
thought that trying America's Army over here, without Xgl, could tell me
something more (i.e. that something's wrong with my configuration or
whatever else). So I typed armyops in the terminal... And surprisingly
enough the game has started. Furthermore, the framerate was quite
satisfactory.

After this quite long introduction I'll finally get to the point. I have
got two questions.

1. Is it possible to enable somehow direct rendering on Xgl, therefore
allowing OpenGL apps to work as ought to.

2. If the answer to the first questions is "NO", then is there a method
of choosing which Xserver to use? Can I choose whether I'd like to
launch Xorg or Xgl? Or maybe I can even enable such choice in GDM login
screen?

If you need any further information regarding by box please don't
hesitate to ask. Any support would be highly appreciated.

Best regards,
Jan Stępień

-- 
Mail 	jan at stepien com pl
Jabber 	jano at jabber aster pl
GG 	1894343
Web	http://stepien.com.pl


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Re: [gentoo-user] Xgl and direct rendering

[Richard Fish]

On 1/18/07, Jan Stępień <jan@stepien.com.pl> wrote:
> 1. Is it possible to enable somehow direct rendering on Xgl, therefore
> allowing OpenGL apps to work as ought to.

No...Xgl is always indirect.

What graphics hardware are you using?  If it is anything but ATI, you
should be able to use the aiglx extensions in current (7.1) versions
of x.org to get beryl working nicely with direct rendering and video
overlays.

> 2. If the answer to the first questions is "NO", then is there a method
> of choosing which Xserver to use? Can I choose whether I'd like to
> launch Xorg or Xgl? Or maybe I can even enable such choice in GDM login
> screen?

I don't know how to do this with GDM, but the easiest way to
accomplish this would be to have gdm manage two separate X sessions,
one with XGL and the other without, to run on two virtual consoles.
You could then switch between them with Ctrl-Alt-Fn sequence.

Note that logging in to any display manager doesn't restart the X
server, it just starts a session on whatever server the display
manager itself is displayed on.  So there isn't really any way to
change what X server is running from the display manager.

-Richard

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Re: [gentoo-user] Xgl and direct rendering

[Richard Fish]

On 1/19/07, Richard Fish <bigfish@asmallpond.org> wrote:
> On 1/18/07, Jan Stępień <jan@stepien.com.pl> wrote:
> > 1. Is it possible to enable somehow direct rendering on Xgl, therefore
> > allowing OpenGL apps to work as ought to.
>
> No...

Bah, apologies for silly answer already provided by others.  This
showed up as a separate thread in my gmail inbox.... :-(

-Richard

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Re: [gentoo-user] Xgl and direct rendering

[Hemmann, Volker Armin]

On Friday 19 January 2007 16:52, Richard Fish wrote:
> On 1/19/07, Richard Fish <bigfish@asmallpond.org> wrote:
> > On 1/18/07, Jan Stępień <jan@stepien.com.pl> wrote:
> > > 1. Is it possible to enable somehow direct rendering on Xgl, therefore
> > > allowing OpenGL apps to work as ought to.
> >
> > No...
>
> Bah, apologies for silly answer already provided by others.  This
> showed up as a separate thread in my gmail inbox.... :-(
>

it is a seperate thread ;)

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