Enabled v-sync in OpenGL and Pong examples (to make them smoother)

examples/opengl/OpenGL.cpp

@@ -15,6 +15,7 @@ int main()
 {
     // Create the main window
     sf::RenderWindow window(sf::VideoMode(800, 600), "SFML OpenGL", sf::Style::Default, sf::ContextSettings(32));
+    window.EnableVerticalSync(true);
 
     // Create a sprite for the background
     sf::Texture backgroundTexture;

examples/pong/Pong.cpp

@@ -28,6 +28,7 @@ int main()
 
     // Create the window of the application
     sf::RenderWindow window(sf::VideoMode(gameWidth, gameHeight, 32), "SFML Pong");
+    window.EnableVerticalSync(true);
 
     // Load the sounds used in the game
     sf::SoundBuffer ballSoundBuffer;