Re: [gtk-vnc-devel] [PATCH] gtkgl based scaling

[Anthony Liguori <anthony codemonkey ws>]

Daniel P. Berrange wrote:
> On Sat, Feb 02, 2008 at 02:16:42PM -0600, Anthony Liguori wrote:
>   
> > I've just committed this patch (it's not in the 0.3.3 release).  Please 
> > try it out and let me know what you think.
> >
> > I've modified gvncviewer so that it has a Full Screen and OpenGL Scaling 
> > menu option.  The dependency on gtkglext is optional and there's also a 
> > new optional dependency on libview.  This is only used by gvncviewer 
> > though so I do not recommend that any distro packages make gtk-vnc 
> > depend on libview.
> >     
>
> The gtkglext stuff seems to be working prertty nicely - it even works on my
> r500 ATI card where I don't even have 3d X driver support, or even 2d accel!
>
> Sometimes though it does not refresh the screen properly. Asan exmaple, if 
> i'm using a xterm and say type 'pwd<enter>', i'll see the 'pwd' characters 
> typed, but not the newline and not the command output - until I type another
> character or move the mouse. So it seems the screen refreshs may be getting 
> delayed somehow.
>   

Yeah, that reminds me, I saw that on another machine with an ATI 
graphics card.  Since I can reproduce it, I'll figure out what the 
problem is.  It doesn't happen on my Intel laptop so I've forgotten 
about it :-)

> Given that it works at an acceptable speed even without an accelerated X
> driver I figure we ought to automatically enable it if the configure script
> finds the neccessary library.
>   

My only thinking was that I didn't want to break applications since the 
scaling is based on the widget size but you may be right.

FWIW, I did some benchmarking on my laptop.  Watching a dvd over VNC, 
scaling by almost double only increased cpu consumption from about 81% 
to 85% so I'm really happy with the accelerated performance.

Regards,

Anthony Liguori

> Regards,
> Dan.
>