GLWidget and Worker thread. UI freezes for update rates greater 15 Hz

SaulGoodman

I have a Qt application with worker thread. The worker thread executes 2 functions void cWorker::updDynamics() and void cWorker::updGraphics() at different frequencies using 2 QTimer.

updGraphics() connects to a slot in a class GLWidget : public QGLWidget in the main thread, which simply invokes updateGL();

My problem is that my main window freezes (GL widget gets updated but I can't resize the window or click buttons) if my graphics update rate is > 15 Hz. Why is this happening and how can I avoid this problem? - I'd like to get 50Hz update at least.

@cWorker::cWorker()
{
m_vertex = 0.1;
}

void cWorker::init()
{
int upd_rate_dynamics = 1000; //Hz
int upd_rate_graphics = 15; //Hz

m_timer_dynamics = new QTimer(this);
connect(m_timer_dynamics, SIGNAL( timeout() ), this, SLOT( updDynamics() ));
m_timer_dynamics->start(1000.0/upd_rate_dynamics);

m_timer_graphics = new QTimer(this);
connect(m_timer_graphics, SIGNAL( timeout() ), this, SLOT( updGraphics() ));
m_timer_graphics->start(1000.0/upd_rate_graphics);

}

void cWorker::updDynamics()
{
std::cout << "cWorker::updDynamics()" << std::endl;
m_vertex += 0.0005;
}

void cWorker::updGraphics()
{
std::cout << "cWorker::updGraphics()" << std::endl;
emit requestRepaint();
}

int main(int argc, char *argv[])
{

cWorker* worker = new cWorker();
QThread* thread = new QThread;
worker->moveToThread(thread);

QObject::connect(thread, SIGNAL(started()), worker, SLOT(init()) );
thread->start();

QApplication a(argc, argv);
MainWindow w;

GLWidget *my_gl_widget = w.findChild<GLWidget*>("widget");
my_gl_widget->m_worker_ptr = worker;

QObject::connect(worker, SIGNAL( requestRepaint() ), my_gl_widget, SLOT( receiveRepaint() ));

w.show();
return a.exec&#40;&#41;;

}@