glViewport(0, 0, 1, 1) 
	Error: GL_INVALID_OPERATION
	Context: 0x7f88a3021e00
	Virtual Screen:  0/2
	kCGLCPCurrentRendererID:  16915206 (0x01021b06)
	GL_RENDERER:  AMD Radeon HD 6750M OpenGL Engine
	GL_VENDOR:  ATI Technologies Inc.
	GL_VERSION:  4.1 ATI-1.24.38
	kCGLCPGPUFragmentProcessing:  GL_TRUE
	kCGLCPGPUVertexProcessing:  GL_TRUE
Function call stack: 
	0: 0x7fff97bbb94e in -[NSOpenGLContext(NSOpenGLContextInternal) _updateOpenGLViewport] in <AppKit> 
	1: 0x10438308f in QCocoaGLContext::makeCurrent(QPlatformSurface*) in <libqcocoa.dylib> 
	2: 0x10178858a in QOpenGLContext::makeCurrent(QSurface*) in <QtGui> 
	3: 0x1010f702e in QOpenGLWidgetPrivate::render() in <QtWidgets> 
	4: 0x1010d6c0b in QWidget::event(QEvent*) in <QtWidgets> 
	5: 0x10109732b in QApplicationPrivate::notify_helper(QObject*, QEvent*) in <QtWidgets> 
	6: 0x10109a648 in QApplication::notify(QObject*, QEvent*) in <QtWidgets> 
	7: 0x101f17d83 in QCoreApplication::notifyInternal(QObject*, QEvent*) in <QtCore> 
	8: 0x1010d0370 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) in <QtWidgets> 
	9: 0x1010d0c9a in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) in <QtWidgets> 
	10: 0x1010d0700 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) in <QtWidgets> 
	11: 0x1010a3d0f in QWidgetBackingStore::doSync() in <QtWidgets> 
	12: 0x1010a2cd6 in QWidgetBackingStore::sync(QWidget*, QRegion const&) in <QtWidgets> 
	13: 0x1010f0e58 in QWidgetWindow::event(QEvent*) in <QtWidgets> 
	14: 0x10109732b in QApplicationPrivate::notify_helper(QObject*, QEvent*) in <QtWidgets> 
	15: 0x10109a648 in QApplication::notify(QObject*, QEvent*) in <QtWidgets> 
	16: 0x101f17d83 in QCoreApplication::notifyInternal(QObject*, QEvent*) in <QtCore> 
	17: 0x10175132d in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) in <QtGui> 
	18: 0x10174d100 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) in <QtGui> 
	19: 0x10173a2da in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) in <QtGui> 
	20: 0x104357411 in QCocoaEventDispatcherPrivate::postedEventsSourceCallback(void*) in <libqcocoa.dylib> 
	21: 0x7fff8efab5b1 in _CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ in <CoreFoundation> 
	22: 0x7fff8ef9cc62 in _CFRunLoopDoSources0 in <CoreFoundation> 
	23: 0x7fff8ef9c3ef in _CFRunLoopRun in <CoreFoundation> 
	24: 0x7fff8ef9be75 in CFRunLoopRunSpecific in <CoreFoundation> 
	25: 0x7fff93e34a0d in RunCurrentEventLoopInMode in <HIToolbox> 
	26: 0x7fff93e347b7 in ReceiveNextEventCommon in <HIToolbox> 
	27: 0x7fff93e345bc in BlockUntilNextEventMatchingListInModeWithFilter in <HIToolbox> 
	28: 0x7fff9789b24e in DPSNextEvent in <AppKit> 
	29: 0x7fff9789a89b in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] in <AppKit> 
	30: 0x7fff9788e99c in -[NSApplication run] in <AppKit> 
	31: 0x1043562fd in QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) in <libqcocoa.dylib> 
	32: 0x101f1537d in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) in <QtCore> 
	33: 0x101f1835a in QCoreApplication::exec() in <QtCore> 
	34: 0x101059799 in main at main.cpp: 33 
	35: 0x101059344 in start in <OpenGLWidgetTest>