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Repost missed Presents with low priority

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This commit is contained in:
Zach Pomerantz 2016-05-11 18:27:32 -07:00
parent 2d4fd783bd
commit 25deaf5bda
1 changed files with 18 additions and 3 deletions
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21
interface/src/Application.cpp
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@ -1786,14 +1786,29 @@ bool Application::event(QEvent* event) {
return false;
}
static bool justPresented = false;
if ((int)event->type() == (int)Present) {
if (justPresented) {
justPresented = false;
// If presentation is hogging the main thread, repost as low priority to avoid hanging the GUI.
// This has the effect of allowing presentation to exceed the paint budget by X times and
// only dropping every (1/X) frames, instead of every ceil(X) frames.
// (e.g. at a 60FPS target, painting for 17us would fall to 58.82FPS instead of 30FPS).
removePostedEvents(this, Present);
postEvent(this, new QEvent(static_cast<QEvent::Type>(Present)), Qt::LowEventPriority);
return true;
}
idle();
removePostedEvents(this, Present); // clear pending presents so we don't clog the pipes
return true;
} else if ((int)event->type() == (int)Paint) {
justPresented = true;
paintGL();
return true;
} else if ((int)event->type() == (int)Lambda) {
}
if ((int)event->type() == (int)Lambda) {
static_cast<LambdaEvent*>(event)->call();
return true;
}
@ -2605,7 +2620,7 @@ void Application::idle() {
_renderedFrameIndex = displayPlugin->presentCount();
// Request a paint ASAP
postEvent(this, new QEvent(static_cast<QEvent::Type>(Paint)), Qt::HighEventPriority);
postEvent(this, new QEvent(static_cast<QEvent::Type>(Paint)), Qt::HighEventPriority + 1);
// Update the deadlock watchdog
updateHeartbeat();