[Xcb] Double buffering ...

[Lars Segerlund]

 Thanks, you already helped me, I had another look yesterday and it
turns out it's actually MIT-Shm that barfs ....

 And the compilation problems are related to Xproto.h and dbeproto.h ,
there seem's to have been an X11 reorganisation which I was aware of
but still didn't account for.

 I am aiming to rewrite the software to use xcb however, and I have
the simple question to the list if there is support for this, and if
not  what is the preffered method for using double buffering with xcb
?

 Also any pointers to example, file or any reference material would be
much appreciated, I had a bit of a hard time yesterday trying to
update my build system ... it seems a lot has changed in X.

 / regards, Lars Segerlund.

2010/8/3 Josh Triplett <josh at joshtriplett.org>:
> On Tue, Aug 03, 2010 at 09:30:50AM +0200, Lars Segerlund wrote:
>>  I am just qurious , I have some programs using double buffering, and
>> they all seem to have stopped working in later X11 releases .. is the
>> double buffer support broken ?
>>
>>  Double buffering is the only way I have found to do smooth updates on
>> old ISA hardware .... which I have in some systems.
>>
>>  Any idea on an alternative path to double buffering ? If it's going
>> deprecated I would like to rewrite in a compliant manner.
>
> You probably want to ask this question on the xorg mailing list.  Unless
> the programs in question attempt to use the XCB library for
> double-buffering. :)
>
> To partially answer your question, though: in general, to do smooth
> updates, you want to sync with vertical retrace ("vsync").  Double
> buffering provides one way to do that: save updates in a back buffer,
> then swap the buffers at vsync.  Other mechanisms exist, though they
> usually amount to the same general concept.  To know why your programs
> stopped working, we'd need to know exactly *how* they try to do
> double-buffering.
>
> - Josh Triplett
>