rust-gamedev/src/main.rs

use sdl2::pixels::Color;
use sdl2::event::Event;
use sdl2::keyboard::Keycode;
use sdl2::render::WindowCanvas;
use std::time::Duration;

fn render(canvas: &mut WindowCanvas, color: Color) {
    canvas.set_draw_color(color);
    canvas.clear();
    canvas.present();
}

fn main() -> Result<(), String> {
    let sdl_context = sdl2::init()?;
    let video_subsystem = sdl_context.video()?;

    let window = video_subsystem.window("game tutorial", 800, 600)
        .position_centered()
        .build()
        .expect("could not initialize video subsystem");

    let mut canvas =  window.into_canvas().build()
        .expect("could not make a canvas");
    
    let mut event_pump = sdl_context.event_pump()?;
    let mut i = 0;
    'running: loop {
        for event in event_pump.poll_iter() {
            match event {
                Event::Quit {..} |
                Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
                    break 'running;
                },
                _ => {}
            }
        }

        i = (i + 1) % 255;

        render(&mut canvas, Color::RGB(i, 64, 255-i));

        ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 60));
    }

    Ok(())
}