Add SDL "Hello, world"

src/main.rs

@@ -1,3 +1,42 @@
-fn main() {
-    println!("Hello, world!");
+use sdl2::pixels::Color;
+use sdl2::event::Event;
+use sdl2::keyboard::Keycode;
+use sdl2::rect::Rect;
+
+fn main() -> Result<(), String> {
+  let sdl_context = sdl2::init()?;
+  let video_subsystem = sdl_context.video()?;
+
+  let window = video_subsystem.window("Rust CHIP-8", 640, 320)
+    .position_centered().build()
+    .expect("could not initialize video subsystem");
+
+  let mut canvas = window.into_canvas().build().expect("could not make a canvas");
+
+  canvas.set_draw_color(Color::RGB(0, 0, 0));
+  canvas.clear();
+
+  let mut event_pump = sdl_context.event_pump()?;
+  let mut i = 0;
+
+  'mainloop: loop {
+    i = (i + 1) % 255;
+    canvas.set_draw_color(Color::RGB(i, 64, 255 - i));
+    canvas.fill_rect(Rect::new(10, 10, 620, 300))?;
+
+    for event in event_pump.poll_iter() {
+      match event {
+        Event::Quit {..} |
+          Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
+            break 'mainloop;
+          },
+        _ => {}
+      }
+    }
+
+    canvas.present();
+    ::std::thread::sleep(::std::time::Duration::new(0, 1_000_000_000u32 / 60));
+  }
+
+  Ok(())
 }