SFML2 - Blinking window

[Ekinox]

Hello !

I'm coming here because a very simple code is not working.

I simply print a graphic window, filled with red. At each display, it switchs black and red ...

The code :

Code: [Select]


sf::RenderWindow Win(sf::VideoMode::GetFullscreenModes()[0], "SFML Test");
Win.SetFramerateLimit(10);
Win.Clear(sf::Color::Red);
while (!Win.GetInput().IsKeyDown(sf::Key::Escape)) {
Win.Display();
}


Moreover, I'm not able to quit the main loop with the escape key, using this code.

What should I do ?
(I downloaded SFML2 snapshot yesterday - or the day before - and built it using CMake, and I use Visual Studio 9 2008 express edition.)

Thanks in advance,
Equinoxe

[Nexus]

You need to clear the window and process the occurred events (using sf::RenderWindow::PollEvent) in each frame of your main loop.

[Ekinox]

Thanks !

Btw that's strange, that a window has 1 frame on 2 black if the application is not cleared (I tried changing the framerate). I thought Clear was to be used only if we wanted some sprites to be removed from the window.

The same goes for Input needing PollEvent (which it btw called GetEvent in the doc), as far as SFML could maintain its own version of the event queue.

[Laurent]

Btw that's strange, that a window has 1 frame on 2 black if the application is not cleared (I tried changing the framerate).

SFML uses double-bufferring, so if you only clear one buffer the other remains uninitialized, and you see it one frame on two (Display() swaps the buffers).

I thought Clear was to be used only if we wanted some sprites to be removed from the window.

Nop, Clear() must be used to restart every new frame. Real-time rendering is about rendering the whole stuff every frame, nothing is persistent in the window.

The same goes for Input needing PollEvent (which it btw called GetEvent in the doc), as far as SFML could maintain its own version of the event queue.

Yes, that's what sf::Input is for: storing events attributes so that they can be accessed at any time.

[Ekinox]

Thanks for these precisions.