SDL2/OpenGl in Rust

cargo.toml

[package]
name = "chapter-01"
version = "0.1.0"
authors = ["Matthew J. Berger <matthewberger@nevada.unr.edu>"]

[dependencies]
gl = "0.10.0"

[dependencies.sdl2]
version = "0.31.0"
features = ["bundled", "static-link"]

main.rs

extern crate sdl2;
extern crate gl;

fn main() {
    let sdl = sdl2::init().unwrap();
    let video_subsystem = sdl.video().unwrap();
    let window = video_subsystem
        .window("Game", 900, 700)
        .opengl()
        .resizable()
        .build()
        .unwrap();

    let _gl_context = window.gl_create_context().unwrap();
    let _gl = gl::load_with(|s| video_subsystem.gl_get_proc_address(s) as *const std::os::raw::c_void);

    unsafe {
        gl::ClearColor(0.3, 0.3, 0.5, 1.0);
    }

    let mut event_pump = sdl.event_pump().unwrap();
    'main: loop {
        for event in event_pump.poll_iter() {
            match event {
                sdl2::event::Event::Quit {..} => break 'main,
                _ => {},
            }
        }

        unsafe {
            gl::Clear(gl::COLOR_BUFFER_BIT);
        }

        window.gl_swap_window();
    }
}