Laggy rendering.

[Veritas]

I updated my nvidia drivers and everything works. I have one issue with vertical sync though, it seems to cap rendering to 40 fps. As a result of this I get some stuttering. Does anyone have any idea how to fix this?

[eXpl0it3r]

I have one issue with vertical sync though, it seems to cap rendering to 40 fps. As a result of this I get some stuttering. Does anyone have any idea how to fix this?

What's the refresh rate of your screen?
Do you run it in window mode?

[Veritas]

Screen's refresh rate is 60 hz.
Yes I run it window mode.

In case I am not measuring the frames correctly here is the testing loop:

        sf::RenderWindow window(sf::VideoMode(1024, 768), "Testing");
                window.setVerticalSyncEnabled(true);
        sf::Clock clock;
        sf::Event event;
        float elapsed;
        while(window.isOpen())
        {
                elapsed += clock.restart().asSeconds();
                std::cout << 1.f/elapsed << std::endl;
                while(elapsed > 1.f/60.f)
                {
                        while(window.pollEvent(event))
                        {
                                if (event.type == sf::Event::Closed || event.key.code == sf::Keyboard::Escape)
                                {
                                        window.close();
                                }
                        }
                        elapsed -= 1.f/60.f;
                }
                window.clear();
                window.display();
        }

What happens is that it starts at 50 fps, goes up to 60 something and then falls down to 30 and starts incrementing again.

[eXpl0it3r]

You can just do

std::cout << 1.f/clock.resetart().asSeconds() << std::endl;

But it's probably more a driver thing, some drivers change the refresh rate in window mode. Not sure, but there might be an option in your driver settings.

[Veritas]

It seems that the same happens in fullscreen mode too.
I reinstall the driver but the problem persists. I am also concerned about the 40-500 fps rate range when not using vsync.

[Veritas]

Fixed. I needed to use an extra variable to correctly keep track of the frames. Simply using the elapsed variable didn't cut it. I will now test some more and notify you about the performance.