connect(m_screen_gpu_rendering, SIGNAL(triggered()), this, SLOT(SetGPURendering()));
connect(m_screen_cpu_rendering, SIGNAL(triggered()), this, SLOT(SetCPURendering()));
connect(m_screen_gpu_rendering, SIGNAL(triggered()), this, SLOT(SetGPURendering()));
connect(m_screen_cpu_rendering, SIGNAL(triggered()), this, SLOT(SetCPURendering()));