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List:       freedesktop-xorg
Subject:    Re: XRender With Vsync
From:       Ryan McClue <re.mcclue () protonmail ! com>
Date:       2021-09-24 8:43:29
Message-ID: Fv7hEJbX22P8uYpSAMpScjEvVeOqZdUeZTcqqjkxF-d1YhmXS87-dZ9QUVY2fyb-RFxNm3TXNKwZ3xABkxT-YQ6SdGelk8huzjZnyeHKx2M= () protonmail ! com
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I have solved the problem. It seems that XCheckTypedWindowEvent() does not return a \
GenericEvent. I found https://github.com/gnif/LookingGlass and \
https://github.com/xfce-mirror/xfwm4 as some examples to go by.

--
Ryan McClue, Sydney

------- Original Message -------

On Thursday, September 23rd, 2021 at 11:35 AM, Ryan McClue <re.mcclue@protonmail.com> \
wrote:

> I'm trying to use XPresent, however I seem unable to receive GenericEvent. I \
> initialize: 
> int present_op = 0, event = 0, error = 0;
> 
> XPresentQueryExtension(xlib_display, &present_op, &event, &error);
> 
> XPresentSelectInput(xlib_display, xlib_window, PresentCompleteNotifyMask);
> 
> In my event loop:
> 
> XEvent xlib_event = {};
> 
> while (XPending(xlib_display) > 0)
> 
> {
> 
> XNextEvent(xlib_display, &xlib_event);
> 
> switch (xlib_event.type)
> 
> {
> 
> case GenericEvent:
> 
> {
> 
> XGenericEventCookie *cookie = (XGenericEventCookie *)&xlib_event.xcookie;
> 
> if (cookie->extension == present_op)
> 
> {
> XGetEventData(xlib_display, cookie);
> if (cookie->evtype == PresentCompleteNotify)
> 
> {
> XRenderComposite(display, PictOpSrc, src_pict, 0, dst_pict,
> 0, 0, 0, 0, 0, 0,
> window_width, window_height);
> }
> XFreeEventData(xlib_display, cookie);
> } break;
> }
> 
> 
> }
> 
> I never receive any GenericEvent.
> 
> Am I doing something wrong?
> -----------------------------------------------------------------
> 
> Ryan McClue, Sydney
> 
> ------- Original Message -------
> 
> On Thursday, September 23rd, 2021 at 3:33 AM, Keith Packard keithp@keithp.com \
> wrote: 
> > Ryan McClue re.mcclue@protonmail.com writes:
> > 
> > > I want this to sync with the monitor's VBLANK, i.e. vsync.
> > > 
> > > How can this be achieved?
> > 
> > Draw to an offscreen pixmap and use the Present extension.
> > 
> > -keith


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