concerns over wayland and need for wayland app display to X Server

Kristian Høgsberg krh at
Mon Feb 27 12:17:04 PST 2012

David, with this message form Daniel we end this thread.  You're
welcome to participate, but before you send emails about the sky
falling, you need to educate yourself a bit more on how things work in


On Mon, Feb 27, 2012 at 3:11 PM, Daniel Stone <daniel at> wrote:
> Hi,
> On 27 February 2012 20:06, David Jackson <djackson452 at> wrote:
>> On Mon, Feb 27, 2012 at 3:03 PM, David Jackson <djackson452 at>
>> wrote:
>>> So, I will be able to display wayland session, or did you mean individual
>>> wayland apps, onto an X server, over an X protocol connection, to a standard
>>> X server? If it is an entire wayland session tht can be displayed over X
>>> protocol to a standard X server, that would be sufficient, as long as the
>>> wayland session can be displayed only to the X server and does not have to
>>> be displayed to real hardware at the same time.
>> As an example, if I wanted to display an wayland session to an  Xvnc server
>> for instance, or an Xfree86 server running on another computer. its
>> possible, right?
>> Thanks for your help.
> Yes, that's completely correct.  You can also have an X session hosted
> inside your Wayland session hosted inside your X session which accepts
> remote connections, or any combination you can come up with.
> Another thing I should add to the list is that the graphics rendering
> is completely unchanged from X11.  The DRI (mid-late 1990s) and DRI2
> (mid-late 2000s) extensions are the model for Wayland's rendering; if
> you have an X app today, it will make GL calls which will go through
> the kernel (which performs basic security/sanity checks) and be
> processed directly by the graphics card.  Once rendering is completed,
> the client simply asks the X server to display the completed buffer,
> without ever having performed any actual rendering through GLX.  In
> fact, the server doesn't know the difference between a buffer which
> the client has rendered to with hardware-accelerated GL, or which the
> client has rendered to in software.
> So, in that sense, it's exactly the same as X11 has been since about 1997.
> Cheers,
> Daniel
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