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Rework session initialization to return to the Qt event loop while connecting

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We also display multiple launch warnings at the same time
This commit is contained in:
Cameron Gutman
2025-11-22 16:51:45 -06:00
parent 6313129603
commit 54283ce0a1
3 changed files with 84 additions and 143 deletions
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141
app/streaming/session.cpp
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@@ -52,9 +52,12 @@
#include <QImage>
#include <QGuiApplication>
#include <QCursor>
#include <QWindow>
#include <QScreen>
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
#include <QQuickOpenGLUtils>
#endif
#define CONN_TEST_SERVER "qt.conntest.moonlight-stream.org"
CONNECTION_LISTENER_CALLBACKS Session::k_ConnCallbacks = {
@@ -595,8 +598,10 @@ Session::~Session()
SDL_DestroyMutex(m_DecoderLock);
}
bool Session::initialize()
bool Session::initialize(QQuickWindow* qtWindow)
{
m_QtWindow = qtWindow;
#ifdef Q_OS_DARWIN
if (qEnvironmentVariableIntValue("I_WANT_BUGGY_FULLSCREEN") == 0) {
// If we have a notch and the user specified one of the two native display modes
@@ -937,37 +942,16 @@ bool Session::initialize()
return false;
}
if (m_Preferences->configurationWarnings) {
// Display launch warnings in Qt only after destroying SDL's window.
// This avoids conflicts between the windows on display subsystems
// such as KMSDRM that only support a single window.
for (const auto &text : m_LaunchWarnings) {
// Emit the warning to the UI
emit displayLaunchWarning(text);
// Wait a little bit so the user can actually read what we just said.
// This wait is a little longer than the actual toast timeout (3 seconds)
// to allow it to transition off the screen before continuing.
uint32_t start = SDL_GetTicks();
while (!SDL_TICKS_PASSED(SDL_GetTicks(), start + 3500)) {
SDL_Delay(5);
if (!m_ThreadedExec) {
// Pump the UI loop while we wait if we're on the main thread
QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
QCoreApplication::sendPostedEvents();
}
}
}
}
return true;
}
void Session::emitLaunchWarning(QString text)
{
// Queue this launch warning to be displayed after validation
m_LaunchWarnings.append(text);
if (m_Preferences->configurationWarnings) {
// Queue this launch warning to be displayed after validation
m_LaunchWarnings.append(text);
emit launchWarningsChanged();
}
}
bool Session::validateLaunch(SDL_Window* testWindow)
@@ -1717,72 +1701,8 @@ void Session::setShouldExitAfterQuit()
m_ShouldExitAfterQuit = true;
}
class ExecThread : public QThread
void Session::start()
{
public:
ExecThread(Session* session) :
QThread(nullptr),
m_Session(session)
{
setObjectName("Session Exec");
}
void run() override
{
m_Session->execInternal();
}
Session* m_Session;
};
void Session::exec(QWindow* qtWindow)
{
m_QtWindow = qtWindow;
// Use a separate thread for the streaming session on X11 or Wayland
// to ensure we don't stomp on Qt's GL context. This breaks when using
// the Qt EGLFS backend, so we will restrict this to X11
m_ThreadedExec = WMUtils::isRunningX11() || WMUtils::isRunningWayland();
if (m_ThreadedExec) {
// Run the streaming session on a separate thread for Linux/BSD
ExecThread execThread(this);
execThread.start();
// Until the SDL streaming window is created, we should continue
// to update the Qt UI to allow warning messages to display and
// make sure that the Qt window can hide itself.
while (!execThread.wait(10) && m_Window == nullptr) {
QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
QCoreApplication::sendPostedEvents();
}
QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
QCoreApplication::sendPostedEvents();
// SDL is in charge now. Wait until the streaming thread exits
// to further update the Qt window.
execThread.wait();
}
else {
// Run the streaming session on the main thread for Windows and macOS
execInternal();
}
}
void Session::execInternal()
{
// Complete initialization in this deferred context to avoid
// calling expensive functions in the constructor (during the
// process of loading the StreamSegue).
//
// NB: This initializes the SDL video subsystem, so it must be
// called on the main thread.
if (!initialize()) {
emit sessionFinished(0);
emit readyForDeletion();
return;
}
// Wait for any old session to finish cleanup
s_ActiveSessionSemaphore.acquire();
@@ -1793,27 +1713,15 @@ void Session::execInternal()
// NB: m_InputHandler must be initialize before starting the connection.
m_InputHandler = new SdlInputHandler(*m_Preferences, m_StreamConfig.width, m_StreamConfig.height);
AsyncConnectionStartThread asyncConnThread(this);
if (!m_ThreadedExec) {
// Kick off the async connection thread while we sit here and pump the event loop
asyncConnThread.start();
while (!asyncConnThread.wait(10)) {
QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
QCoreApplication::sendPostedEvents();
}
// Pump the event loop one last time to ensure we pick up any events from
// the thread that happened while it was in the final successful QThread::wait().
QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
QCoreApplication::sendPostedEvents();
}
else {
// We're already in a separate thread so run the connection operations
// synchronously and don't pump the event loop. The main thread is already
// pumping the event loop for us.
asyncConnThread.run();
}
// Kick off the async connection thread then return to the caller to pump the event loop
auto thread = new AsyncConnectionStartThread(this);
QObject::connect(thread, &QThread::finished, this, &Session::exec);
QObject::connect(thread, &QThread::finished, thread, &QThread::deleteLater);
thread->start();
}
void Session::exec()
{
// If the connection failed, clean up and abort the connection.
if (!m_AsyncConnectionSuccess) {
delete m_InputHandler;
@@ -2434,6 +2342,13 @@ DispatchDeferredCleanup:
SDL_QuitSubSystem(SDL_INIT_VIDEO);
// Reset this thread's OpenGL state back to what Qt expects
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
QQuickOpenGLUtils::resetOpenGLState();
#else
m_QtWindow->resetOpenGLState();
#endif
// Cleanup can take a while, so dispatch it to a worker thread.
// When it is complete, it will release our s_ActiveSessionSemaphore
// reference.