From 0c2491e3c9082f5d2b57e9d88c786dcbb52c6b6e Mon Sep 17 00:00:00 2001 From: "Owen W. Taylor" Date: Mon, 12 Nov 2012 13:39:59 -0500 Subject: [PATCH] Use clutter_stage_set_sync_delay() Using a "sync delay" where we wait for 2 ms after the vblank before starting to draw the next frame provides for much more predictable latency for applications. An application can know that if it completes a frame any time between 8ms before the vblank to the vblank, it will reliably be drawn on the following vblank period, rather than having an unpredictable latency depending on whether the compositor is currently busy drawing a frame or not. https://bugzilla.gnome.org/show_bug.cgi?id=685463 --- src/compositor/compositor.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c index b53e418ee..d0c40e66c 100644 --- a/src/compositor/compositor.c +++ b/src/compositor/compositor.c @@ -549,6 +549,9 @@ meta_compositor_manage_screen (MetaCompositor *compositor, g_signal_connect_after (info->stage, "paint", G_CALLBACK (after_stage_paint), info); + /* Wait 6-ms after vblank before starting to draw next frame */ + clutter_stage_set_sync_delay (CLUTTER_STAGE (info->stage), 2); + meta_screen_get_size (screen, &width, &height); clutter_actor_realize (info->stage);