Re: [gtk-vnc-devel] PATCH: 0/2: Replace gtkglext/opengl rendering with Cairo

[Anthony Liguori <anthony codemonkey ws>]

Daniel P. Berrange wrote:
> As you'll know the current scaling code uses OpenGL/GtkGlExt, while this
> works OK in terms of performance, there are unpleasant interactions if
> you have a desktop using OpenGL. ie Compiz. Alot of people like to use
> Compiz, and this means they're unable to take advantage of our scaling
> code in GTK-VNC. To work properly requires X + the driver to support
> redirected direct rendering / DRI2.
>
> Speaking to some of the X developers I work with at Red Hat, it seems
> while the Intel X driver will soon have this support (on by default for 
> Fedora 10), the Radeon driver is a long way off, and the NVidia driver is
> not even being thought about. One of our GTK developers then suggested
> that I try using Cairo instead of OpenGL, because it can use the Render
> extension to ensure that simple 2-d drawing operations will use hardware
> acceleration without needing full OpenGL.
>
> This patch series does just that. To make the patch easier to understand
> I did it in two parts. First I removed the existing OpenGL/GtkGlExt code,
> and then I added the cairo code. In my testing on a Fedora 9 host with the
> open source radeon driver the performance when scaling with Cairo is
> indistinguishable from that when non-scaled. So it appears to be working
> as advertized.
>   

You rock!  Let's do this.  Even if it's slower than OpenGL, it's so much 
nicer.

Regards,

Anthony Liguori

> Daniel
>