Makes sure the timer really, really is on a different thread.

Thereby allows me substantially to reduce audio latency.

OSBindings/Qt/.gitignore

@@ -0,0 +1,73 @@
+# This file is used to ignore files which are generated
+# ----------------------------------------------------------------------------
+
+*~
+*.autosave
+*.a
+*.core
+*.moc
+*.o
+*.obj
+*.orig
+*.rej
+*.so
+*.so.*
+*_pch.h.cpp
+*_resource.rc
+*.qm
+.#*
+*.*#
+core
+!core/
+tags
+.DS_Store
+.directory
+*.debug
+Makefile*
+*.prl
+*.app
+moc_*.cpp
+ui_*.h
+qrc_*.cpp
+Thumbs.db
+*.res
+*.rc
+/.qmake.cache
+/.qmake.stash
+
+# qtcreator generated files
+*.pro.user*
+
+# xemacs temporary files
+*.flc
+
+# Vim temporary files
+.*.swp
+
+# Visual Studio generated files
+*.ib_pdb_index
+*.idb
+*.ilk
+*.pdb
+*.sln
+*.suo
+*.vcproj
+*vcproj.*.*.user
+*.ncb
+*.sdf
+*.opensdf
+*.vcxproj
+*vcxproj.*
+
+# MinGW generated files
+*.Debug
+*.Release
+
+# Python byte code
+*.pyc
+
+# Binaries
+# --------
+*.dll
+*.exe
+

OSBindings/Qt/ClockSignal.pro

@@ -1,4 +1,4 @@
-QT       += core gui multimedia quickwidgets
+QT       += core gui multimedia
 
 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 

OSBindings/Qt/mainwindow.cpp

@@ -63,7 +63,15 @@ void MainWindow::open() {
 }
 
 MainWindow::~MainWindow() {
-	// Stop the timer
+	// Stop the audio output, and its thread.
+	if(audioOutput) {
+		audioOutput->stop();
+
+		audioThread.quit();
+		while(audioThread.isRunning());
+	}
+
+	// Stop the timer.
 	timer.reset();
 }
 
@@ -142,7 +150,7 @@ void MainWindow::launchMachine() {
 			// Install audio output if required.
 			const auto audio_producer = machine->audio_producer();
 			if(audio_producer) {
-				static constexpr size_t samplesPerBuffer = 2048;	// TODO: select this dynamically; it's very high.
+				static constexpr size_t samplesPerBuffer = 256;	// TODO: select this dynamically.
 				const auto speaker = audio_producer->get_speaker();
 				if(speaker) {
 					const QAudioDeviceInfo &defaultDeviceInfo = QAudioDeviceInfo::defaultOutputDevice();
@@ -175,8 +183,7 @@ void MainWindow::launchMachine() {
 			// If this is a timed machine, start up the timer.
 			const auto timedMachine = machine->timed_machine();
 			if(timedMachine) {
-				timer->setMachine(timedMachine, &machineMutex);
-				timer->start();
+				timer->startWithMachine(timedMachine, &machineMutex);
 			}
 
 		} break;

OSBindings/Qt/timer.cpp

@@ -6,21 +6,23 @@
 #include <QDebug>
 
 Timer::Timer(QObject *parent) : QObject(parent) {
-	// Set up the emulation timer. Bluffer's guide: the QTimer will post an
-	// event to an event loop. QThread is a thread with an event loop.
-	// My class, Timer, will be wired up to receive the QTimer's events.
-	timer = std::make_unique<QTimer>(this);
-	timer->setInterval(1);
+	thread.setFunction([this] {
+		// Set up the emulation timer. Bluffer's guide: the QTimer will post an
+		// event to an event loop. QThread is a thread with an event loop.
+		// My class, Timer, will be wired up to receive the QTimer's events.
+		timer = std::make_unique<QTimer>(&thread);
+		timer->setInterval(1);
 
-	thread = std::make_unique<QThread>(this);
-
-	moveToThread(thread.get());
-	connect(timer.get(), SIGNAL(timeout()), this, SLOT(tick()));
+		connect(timer.get(), SIGNAL(timeout()), this, SLOT(tick()), Qt::DirectConnection);
+		timer->start();
+	});
 }
 
-void Timer::setMachine(MachineTypes::TimedMachine *machine, std::mutex *machineMutex) {
+void Timer::startWithMachine(MachineTypes::TimedMachine *machine, std::mutex *machineMutex) {
 	this->machine = machine;
 	this->machineMutex = machineMutex;
+
+	thread.start();
 }
 
 void Timer::tick() {
@@ -33,14 +35,9 @@ void Timer::tick() {
 	machine->run_for(double(duration) / 1e9);
 }
 
-void Timer::start() {
-	thread->start();
-	timer->start();
-}
-
 Timer::~Timer() {
 	// Stop the timer, then ask the QThread to exit and wait for it to do so.
 	timer->stop();
-	thread->exit();
-	while(thread->isRunning());
+	thread.exit();
+	while(thread.isRunning());
 }

OSBindings/Qt/timer.h

@@ -8,6 +8,7 @@
 #include <QTimer>
 
 #include "../../Machines/Utility/MachineForTarget.hpp"
+#include "functionthread.h"
 
 class Timer : public QObject
 {
@@ -17,8 +18,7 @@ class Timer : public QObject
 		explicit Timer(QObject *parent = nullptr);
 		~Timer();
 
-		void setMachine(MachineTypes::TimedMachine *machine, std::mutex *machineMutex);
-		void start();
+		void startWithMachine(MachineTypes::TimedMachine *machine, std::mutex *machineMutex);
 
 	public slots:
 		void tick();
@@ -27,7 +27,7 @@ class Timer : public QObject
 		MachineTypes::TimedMachine *machine = nullptr;
 		std::mutex *machineMutex = nullptr;
 		int64_t lastTickNanos = 0;
-		std::unique_ptr<QThread> thread;
+		FunctionThread thread;
 		std::unique_ptr<QTimer> timer;
 };