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System / Ending thread causes fullscreen window to flicker

« on: March 05, 2013, 04:07:53 pm »

Hi.

First of, thanks for a very well made library. It's easy to use, well documented and fast to get used to.

I have however run into a small problem I can't seem to solve by myself:
If I run my application in fullscreen mode and create a secondary thread, the render window will flicker quickly when the thread ends. This does not occur however if I alt-tab to show the console ontop of the render window, or if I choose to run the application in windowed mode.

I'm guessing it has something to do with accessing OpenGL functions in the secondary thread but how can I load OpenGL resources in a background thread without creating the annoying flicker.

Here is some minimal code to recreate the event:

#include <SFML\System.hpp>
#include <SFML\Window.hpp>
#include <SFML\Graphics.hpp>

void threadFunc(){
        sf::Clock clock;
        sf::Time time = sf::seconds(2);

        sf::RenderTexture t;
        while(clock.getElapsedTime().asSeconds() < time.asSeconds() )
        {
        }
}

int main(){
    sf::RenderWindow window(sf::VideoMode(1920,1080), "Test", sf::Style::Fullscreen );
       
        sf::Thread thread(threadFunc); 
        thread.launch();

    while (window.isOpen())
    {
                if(sf::Keyboard::isKeyPressed(sf::Keyboard::Escape) )
                        window.close();

        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
        }

        window.clear(sf::Color::Blue);
        window.display();
    }

    return 0;

}

Hope someone can assist me.

Thanks // Simon (aka. Gikkman)