@@ -22,7 +22,16 @@ set(BUILD_QT OFF PARENT_SCOPE)
 	return()
 endif()
 
-set(SOURCE_FILES AudioDevice.cpp AudioProcessor.cpp Display.cpp GameController.cpp Window.cpp)
+set(SOURCE_FILES
+	AudioDevice.cpp
+	AudioProcessor.cpp
+	Display.cpp
+	GameController.cpp
+	LogView.cpp
+	Window.cpp)
+
+qt5_wrap_ui(UI_FILES
+	LogView.ui)
 
 if(USE_GDB_STUB)
 	set(SOURCE_FILES ${PLATFORM_SRC} ${SOURCE_FILES} GDBController.cpp GDBWindow.cpp)
@@ -31,7 +40,7 @@ set(MACOSX_BUNDLE_ICON_FILE mgba.icns)
 set(MACOSX_BUNDLE_BUNDLE_VERSION ${LIB_VERSION_STRING})
 set_source_files_properties(${CMAKE_SOURCE_DIR}/res/mgba.icns PROPERTIES MACOSX_PACKAGE_LOCATION Resources)
 
-add_executable(mGBA WIN32 MACOSX_BUNDLE main.cpp ${CMAKE_SOURCE_DIR}/res/mgba.icns ${SOURCE_FILES})
+add_executable(mGBA WIN32 MACOSX_BUNDLE main.cpp ${CMAKE_SOURCE_DIR}/res/mgba.icns ${SOURCE_FILES} ${UI_FILES})
 
 qt5_use_modules(mGBA Widgets Multimedia OpenGL)
 target_link_libraries(mGBA ${PLATFORM_LIBRARY} ${OPENGL_LIBRARY} ${BINARY_NAME} Qt5::Widgets)

@@ -32,7 +32,8 @@ .frameskip = 0,
 		.bios = 0,
 		.renderer = &m_renderer->d,
 		.userData = this,
-		.rewindBufferCapacity = 0
+		.rewindBufferCapacity = 0,
+		.logLevel = -1,
 	};
 
 	GBAInputMapInit(&m_threadContext.inputMap);
@@ -65,6 +66,11 @@ controller->gamePaused(&controller->m_threadContext);
 		}
 		controller->m_pauseMutex.unlock();
 		controller->frameAvailable(controller->m_drawContext);
+	};
+
+	m_threadContext.logHandler = [] (GBAThread* context, enum GBALogLevel level, const char* format, va_list args) {
+		GameController* controller = static_cast<GameController*>(context->userData);
+		controller->postLog(level, QString().vsprintf(format, args));
 	};
 
 	m_audioThread->start();

@@ -46,6 +46,8 @@ void gameStopped(GBAThread*);
 	void gamePaused(GBAThread*);
 	void gameUnpaused(GBAThread*);
 
+	void postLog(int level, const QString& log);
+
 public slots:
 	void loadGame(const QString& path);
 	void closeGame();

@@ -0,0 +1,98 @@
+#include "LogView.h"
+
+using namespace QGBA;
+
+LogView::LogView(QWidget* parent)
+	: QWidget(parent)
+{
+	m_ui.setupUi(this);
+	connect(m_ui.levelDebug, SIGNAL(toggled(bool)), this, SLOT(setLevelDebug(bool)));
+	connect(m_ui.levelStub, SIGNAL(toggled(bool)), this, SLOT(setLevelStub(bool)));
+	connect(m_ui.levelInfo, SIGNAL(toggled(bool)), this, SLOT(setLevelInfo(bool)));
+	connect(m_ui.levelWarn, SIGNAL(toggled(bool)), this, SLOT(setLevelWarn(bool)));
+	connect(m_ui.levelError, SIGNAL(toggled(bool)), this, SLOT(setLevelError(bool)));
+	connect(m_ui.levelFatal, SIGNAL(toggled(bool)), this, SLOT(setLevelFatal(bool)));
+	connect(m_ui.levelGameError, SIGNAL(toggled(bool)), this, SLOT(setLevelGameError(bool)));
+	m_logLevel = -1;
+}
+
+void LogView::postLog(int level, const QString& log) {
+	if (!(level & m_logLevel)) {
+		return;
+	}
+	m_ui.view->appendPlainText(QString("%1:\t%2").arg(toString(level)).arg(log));
+}
+
+void LogView::clear() {
+	m_ui.view->clear();
+}
+
+void LogView::setLevelDebug(bool set) {
+	if (set) {
+		setLevel(GBA_LOG_DEBUG);
+	} else {
+		clearLevel(GBA_LOG_DEBUG);
+	}
+}
+void LogView::setLevelStub(bool set) {
+	if (set) {
+		setLevel(GBA_LOG_STUB);
+	} else {
+		clearLevel(GBA_LOG_STUB);
+	}
+}
+void LogView::setLevelInfo(bool set) {
+	if (set) {
+		setLevel(GBA_LOG_INFO);
+	} else {
+		clearLevel(GBA_LOG_INFO);
+	}
+}
+void LogView::setLevelWarn(bool set) {
+	if (set) {
+		setLevel(GBA_LOG_WARN);
+	} else {
+		clearLevel(GBA_LOG_WARN);
+	}
+}
+void LogView::setLevelError(bool set) {
+	if (set) {
+		setLevel(GBA_LOG_ERROR);
+	} else {
+		clearLevel(GBA_LOG_ERROR);
+	}
+}
+void LogView::setLevelFatal(bool set) {
+	if (set) {
+		setLevel(GBA_LOG_FATAL);
+	} else {
+		clearLevel(GBA_LOG_FATAL);
+	}
+}
+void LogView::setLevelGameError(bool set) {
+	if (set) {
+		setLevel(GBA_LOG_GAME_ERROR);
+	} else {
+		clearLevel(GBA_LOG_GAME_ERROR);
+	}
+}
+
+QString LogView::toString(int level) {
+	switch (level) {
+	case GBA_LOG_DEBUG:
+		return tr("DEBUG");
+	case GBA_LOG_STUB:
+		return tr("STUB");
+	case GBA_LOG_INFO:
+		return tr("INFO");
+	case GBA_LOG_WARN:
+		return tr("WARN");
+	case GBA_LOG_ERROR:
+		return tr("ERROR");
+	case GBA_LOG_FATAL:
+		return tr("FATAL");
+	case GBA_LOG_GAME_ERROR:
+		return tr("GAME ERROR");
+	}
+	return QString();
+}

@@ -0,0 +1,44 @@
+#ifndef QGBA_LOG_VIEW
+#define QGBA_LOG_VIEW
+
+#include <QWidget>
+
+#include "ui_LogView.h"
+
+extern "C" {
+#include "gba-thread.h"
+}
+
+namespace QGBA {
+
+class LogView : public QWidget {
+Q_OBJECT
+
+public:
+	LogView(QWidget* parent = nullptr);
+
+public slots:
+	void postLog(int level, const QString& log);
+	void clear();
+
+private slots:
+	void setLevelDebug(bool);
+	void setLevelStub(bool);
+	void setLevelInfo(bool);
+	void setLevelWarn(bool);
+	void setLevelError(bool);
+	void setLevelFatal(bool);
+	void setLevelGameError(bool);
+
+private:
+	Ui::LogView m_ui;
+	int m_logLevel;
+
+	static QString toString(int level);
+	void setLevel(int level) { m_logLevel |= level; }
+	void clearLevel(int level) { m_logLevel &= ~level; }
+};
+
+}
+
+#endif

@@ -0,0 +1,164 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>LogView</class>
+ <widget class="QWidget" name="LogView">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>600</width>
+    <height>400</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Logs</string>
+  </property>
+  <layout class="QHBoxLayout" name="horizontalLayout">
+   <item>
+    <layout class="QVBoxLayout" name="verticalLayout_2">
+     <item>
+      <widget class="QGroupBox" name="groupBox">
+       <property name="title">
+        <string/>
+       </property>
+       <layout class="QVBoxLayout" name="verticalLayout">
+        <item>
+         <widget class="QCheckBox" name="levelDebug">
+          <property name="text">
+           <string>Debug</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QCheckBox" name="levelStub">
+          <property name="text">
+           <string>Stub</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QCheckBox" name="levelInfo">
+          <property name="text">
+           <string>Info</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QCheckBox" name="levelWarn">
+          <property name="text">
+           <string>Warning</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QCheckBox" name="levelError">
+          <property name="text">
+           <string>Error</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QCheckBox" name="levelFatal">
+          <property name="text">
+           <string>Fatal</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <spacer name="verticalSpacer">
+          <property name="orientation">
+           <enum>Qt::Vertical</enum>
+          </property>
+          <property name="sizeType">
+           <enum>QSizePolicy::Fixed</enum>
+          </property>
+          <property name="sizeHint" stdset="0">
+           <size>
+            <width>20</width>
+            <height>40</height>
+           </size>
+          </property>
+         </spacer>
+        </item>
+        <item>
+         <widget class="QCheckBox" name="levelGameError">
+          <property name="text">
+           <string>Game Error</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <spacer name="verticalSpacer_2">
+          <property name="orientation">
+           <enum>Qt::Vertical</enum>
+          </property>
+          <property name="sizeHint" stdset="0">
+           <size>
+            <width>20</width>
+            <height>40</height>
+           </size>
+          </property>
+         </spacer>
+        </item>
+       </layout>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="clear">
+       <property name="text">
+        <string>Clear</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QPlainTextEdit" name="view">
+     <property name="readOnly">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>clear</sender>
+   <signal>clicked()</signal>
+   <receiver>view</receiver>
+   <slot>clear()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>98</x>
+     <y>376</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>299</x>
+     <y>311</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

@@ -8,6 +8,7 @@
 #include "GameController.h"
 #include "GDBWindow.h"
 #include "GDBController.h"
+#include "LogView.h"
 
 using namespace QGBA;
 
@@ -21,17 +22,24 @@ setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 	setMinimumSize(240, 160);
 
 	m_controller = new GameController(this);
+	m_logView = new LogView();
 	m_display = new Display();
 	setCentralWidget(m_display);
 	connect(m_controller, SIGNAL(gameStarted(GBAThread*)), this, SLOT(gameStarted(GBAThread*)));
 	connect(m_controller, SIGNAL(gameStopped(GBAThread*)), m_display, SLOT(stopDrawing()));
 	connect(m_controller, SIGNAL(gameStopped(GBAThread*)), this, SLOT(gameStopped()));
+	connect(m_controller, SIGNAL(postLog(int, const QString&)), m_logView, SLOT(postLog(int, const QString&)));
 	connect(this, SIGNAL(startDrawing(const uint32_t*, GBAThread*)), m_display, SLOT(startDrawing(const uint32_t*, GBAThread*)), Qt::QueuedConnection);
 	connect(this, SIGNAL(shutdown()), m_display, SLOT(stopDrawing()));
+	connect(this, SIGNAL(shutdown()), m_controller, SLOT(closeGame()));
 	connect(this, SIGNAL(audioBufferSamplesChanged(int)), m_controller, SLOT(setAudioBufferSamples(int)));
 	connect(this, SIGNAL(fpsTargetChanged(float)), m_controller, SLOT(setFPSTarget(float)));
 
 	setupMenu(menuBar());
+}
+
+Window::~Window() {
+	delete m_logView;
 }
 
 GBAKey Window::mapKey(int qtKey) {
@@ -232,6 +240,9 @@ connect(setBuffer, &QAction::triggered, [this]() { emit audioBufferSamplesChanged(2048); });
 	buffersMenu->addAction(setBuffer);
 
 	QMenu* debuggingMenu = menubar->addMenu(tr("&Debugging"));
+	QAction* viewLogs = new QAction(tr("View &logs..."), nullptr);
+	connect(viewLogs, SIGNAL(triggered()), m_logView, SLOT(show()));
+	debuggingMenu->addAction(viewLogs);
 #ifdef USE_GDB_STUB
 	QAction* gdbWindow = new QAction(tr("Start &GDB server..."), nullptr);
 	connect(gdbWindow, SIGNAL(triggered()), this, SLOT(gdbOpen()));

@@ -14,12 +14,15 @@ namespace QGBA {
 
 class GameController;
 class GDBController;
+class LogView;
 
 class Window : public QMainWindow {
 Q_OBJECT
 
 public:
 	Window(QWidget* parent = nullptr);
+	virtual ~Window();
+
 	static GBAKey mapKey(int qtKey);
 
 signals:
@@ -51,6 +54,7 @@ void setupMenu(QMenuBar*);
 	GameController* m_controller;
 	Display* m_display;
 	QList<QAction*> m_gameActions;
+	LogView* m_logView;
 
 #ifdef USE_GDB_STUB
 	GDBController* m_gdbController;