1 files changed, 18 insertions, 2 deletions
diff --git a/src/main.rs b/src/main.rs
index 4c47172..a49fa6f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,12 +4,20 @@ use sdl2::pixels::Color;
 use sdl2::event::Event;
 use sdl2::keyboard::Keycode;
 use std::time::Duration;
-use sdl2::rect::Rect;
 use chip8::Chip;
+use std::env;
 
 
 pub fn main() {
+    //new chip struct
+    let args: Vec<String> = env::args().collect();
+    if args.len() != 2 { panic!("Incorrect format; please pass a single rom file as a parameter"); }
     let mut chip = Chip::new();
+    chip.init();
+    chip.read_rom(args[1].as_str());
+
+
+    //SDL initalizationa and window creation
     let sdl_context = sdl2::init().unwrap();
     let video_subsystem = sdl_context.video().unwrap();
     let window = video_subsystem.window("CHIP-8", chip8::WIDTH * chip8::SCALE, chip8::HEIGHT * chip8::SCALE)
@@ -17,9 +25,12 @@ pub fn main() {
         .build()
         .unwrap();
 
+    //Canvas to interact with
     let mut canvas = window.into_canvas().build().unwrap();
 
+    //Keyboard input handler
     let mut event_pump = sdl_context.event_pump().unwrap();
+    //Main loop called 'running', checks for keyboard input and renders the display grid
     'running: loop {
         for event in event_pump.poll_iter() {
             match event {
@@ -31,10 +42,15 @@ pub fn main() {
             }
         }
         // The rest of the game loop goes here...
+        //Draw black bg
         canvas.set_draw_color(Color::RGB(0, 0, 0));
+        //clear the screen with black bg
         canvas.clear();
+        //choose white color 
         canvas.set_draw_color(Color::RGB(255, 255, 255));
-        canvas.fill_rects(chip.render());
+        //render all the rectangles as white pixels on the canvas
+        canvas.fill_rects(chip.render()).unwrap();
+        //display canvas
         canvas.present();
 
         std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 60));