Re: How do I sync output changes to vertical retrace?

On Mon, 13 Feb 2006, Barry Scott wrote:

> I have a text scrolling app that is not playing smoothly.
>
> Attempting to update the windows on a timer is not keeping my changes in
> sync with the monitors refresh. This is causing visual glitches.
>
> What mechanisms can I use to lock my changes to the monitor refresh rate?

  The only mechanism I know of is OpenGL.  Most OpenGL drivers have
a mechanism to allow buffer swapping at vblank.

> If I use DBE is it going to change the screen in the vertical blanking
> interval?
>

   No, it won't.  At least not in the XFree86/X.org implementations.


		Mark.