From 4693e9ac0b6792e8a6d2af2e46499158bf6b2509 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sun, 15 Mar 2020 14:33:12 +0100
Subject: X11: Read from server if necessary in puglDispatchEvents()
This reduces input lag. The previous approach was an over-optimization: what's
important here is to keep the iteration bounded by not continually flushing,
but we do want to read everything to be as up to date as possible.
---
pugl/detail/x11.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/pugl/detail/x11.c b/pugl/detail/x11.c
index 7b83b38..4747f64 100644
--- a/pugl/detail/x11.c
+++ b/pugl/detail/x11.c
@@ -744,14 +744,14 @@ puglDispatchEvents(PuglWorld* world)
{
const PuglX11Atoms* const atoms = &world->impl->atoms;
- // Flush just once at the start to fill event queue
+ // Flush output to the server once at the start
Display* display = world->impl->display;
XFlush(display);
world->impl->dispatchingEvents = true;
- // Process all queued events (locally, without flushing or reading)
- while (XEventsQueued(display, QueuedAlready) > 0) {
+ // Process all queued events (without further flushing)
+ while (XEventsQueued(display, QueuedAfterReading) > 0) {
XEvent xevent;
XNextEvent(display, &xevent);
--
cgit v1.2.1