Creating a window

The previous example created a window and drew into it. Now let's see how it did that!

Before going any further, we need to import the SDL2 crate, as follows:

    extern crate sdl2;

With this, we now have access to everything it contains.

Now that we've imported sdl2, we need to initialize an SDL context:

    let sdl_context = sdl2::init().expect("SDL initialization failed");

Once done, we need to get the video subsystem:

    let video_subsystem = sdl_context.video().expect("Couldn't get SDL 
      video subsystem");

We can now create the window:

    let window = video_subsystem.window("Tetris", 800, 600)
                            .position_centered()
                            .opengl()
                            .build()
                            .expect("Failed to create window");

A few notes on these methods:

• The parameters for the window method are title, width, height
• .position_centered() gets the window in the middle of the screen
• .opengl() makes the SDL use opengl to render...