First Window

Was able to render a window using sdl2. Needs to be broken out
into it's own separate components and abstracted away. This should
take care of the requirements for issue #12.

src/main.rs

@@ -1,11 +1,31 @@
+extern crate sdl2;
+
+use sdl2::event::Event;
+use sdl2::keyboard::Keycode;
+use sdl2::pixels::Color;
+use std::time::Duration;
+
 mod doomlevel;
 mod wadfile;
 
 use doomlevel::DoomLevel;
 use wadfile::WADFile;
 
-fn main() {
-    let wad_file = WADFile::from_path("WADs/doom1.wad").unwrap();
+static WIDTH: u32 = 320;
+static HEIGHT: u32 = 200;
+static SCALING: u32 = 4;
+
+fn find_sdl_gl_driver() -> Option<u32> {
+    for (index, item) in sdl2::render::drivers().enumerate() {
+        if item.name == "opengl" {
+            return Some(index as u32);
+        }
+    }
+    None
+}
+
+fn main() -> Result<(), &'static str> {
+    let wad_file = WADFile::from_path("WADs/doom1.wad")?;
     let level = DoomLevel::load_level(&wad_file, wad_file.get_index_from_name("e1m1").unwrap());
 
     println!(
@@ -84,4 +104,49 @@ Flags:
         level.linedefs[test_linedef].never_automap(),
         level.linedefs[test_linedef].always_automap()
     );
+
+    let sdl_context = sdl2::init().unwrap();
+    let video_subsystem = sdl_context.video().unwrap();
+
+    let window = video_subsystem
+        .window("Doom - Oxidized", WIDTH * SCALING, HEIGHT * SCALING)
+        .position_centered()
+        .opengl()
+        .build()
+        .unwrap();
+
+    let mut canvas = window
+        .into_canvas()
+        .index(find_sdl_gl_driver().unwrap())
+        .build()
+        .unwrap();
+
+    canvas.set_draw_color(Color::RGB(0, 255, 255));
+    canvas.clear();
+    canvas.present();
+
+    let mut event_pump = sdl_context.event_pump().unwrap();
+
+    let mut i = 0;
+    'running: loop {
+        i = (i + 1) % 255;
+        canvas.set_draw_color(Color::RGB(i, 64, 255 - i));
+        canvas.clear();
+
+        for event in event_pump.poll_iter() {
+            match event {
+                Event::Quit { .. }
+                | Event::KeyDown {
+                    keycode: Some(Keycode::Escape),
+                    ..
+                } => break 'running,
+                _ => {}
+            }
+        }
+
+        canvas.present();
+        ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 30));
+    }
+
+    Ok(())
 }