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+checksum = "541b12c998c5b56aa2b4e6f18f03664eef9a4fd0a246a55594efae6cc2d964b5"
diff --git a/Cargo.toml b/Cargo.toml
index 8f5f30e..09f7e9d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,14 @@
 [package]
 name = "rustenstein"
 version = "0.1.0"
+edition = "2021"
 authors = ["Fabien Freling <public@ffreling.com>"]
 
 [dependencies]
-piston_window = "0.107.0"
+minifb = "0.19.3"
+
+# From https://fasterthanli.me/articles/my-ideal-rust-workflow#advice-start
+[profile.release]
+debug = 1
+incremental = true
+lto = "off"
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..bb75080
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "1.56.1"
+components = [ "rustfmt", "clippy" ]
diff --git a/src/engine.rs b/src/engine.rs
index a3690d4..811db3f 100644
--- a/src/engine.rs
+++ b/src/engine.rs
@@ -1,5 +1,5 @@
-extern crate piston_window;
-use piston_window::*;
+// extern crate piston_window;
+// use piston_window::*;
 
 use std::f64::consts::*;
 
@@ -24,12 +24,12 @@ type Radian = f64;
 
 #[derive(Debug)]
 struct Player {
-   pos: Position,
-   angle: Degree,
+    pos: Position,
+    angle: Degree,
 }
 
 impl Player {
-    pub fn player_space_distance(&self, other: Position) ->f64 {
+    pub fn player_space_distance(&self, other: Position) -> f64 {
         let rad = self.angle.to_radians();
         let dx = other.x - self.pos.x;
         let dy = other.y - self.pos.y;
@@ -42,7 +42,6 @@ impl Player {
     }
 }
 
-
 #[derive(Debug, Copy, Clone, PartialEq)]
 pub enum Tile {
     Empty,
@@ -159,10 +158,10 @@ pub struct Engine {
 }
 
 impl Engine {
-    pub fn new(size: Size) -> Engine {
+    pub fn new(width: usize, height: usize) -> Engine {
         Engine {
-            w: size.width as f64,
-            h: size.height as f64,
+            w: width as f64,
+            h: height as f64,
             horiz_fov: 90.,
             player: Player {
                 pos: Position { x: 1.5, y: 2. },
@@ -177,22 +176,26 @@ impl Engine {
         }
     }
 
-    pub fn render(&mut self, context: Context, graphics: &mut G2d) {
-        clear([1.0; 4], graphics);
+    pub fn render(&mut self, buffer: &mut Vec<u32>) {
+        // clear([1.0; 4], graphics);
 
-        // Ceiling
-        let ceiling_color = [0.3, 0.3, 0.3, 1.0];
-        rectangle(ceiling_color,
-                  [0.0, 0.0, self.w, self.h / 2.0],
-                  context.transform,
-                  graphics);
+        // // Ceiling
+        // let ceiling_color = [0.3, 0.3, 0.3, 1.0];
+        // rectangle(
+        //     ceiling_color,
+        //     [0.0, 0.0, self.w, self.h / 2.0],
+        //     context.transform,
+        //     graphics,
+        // );
 
-        // Floor
-        let floor_color = [0.5, 0.5, 0.5, 1.0];
-        rectangle(floor_color,
-                  [0.0, self.h / 2.0, self.w, self.h / 2.0],
-                  context.transform,
-                  graphics);
+        // // Floor
+        // let floor_color = [0.5, 0.5, 0.5, 1.0];
+        // rectangle(
+        //     floor_color,
+        //     [0.0, self.h / 2.0, self.w, self.h / 2.0],
+        //     context.transform,
+        //     graphics,
+        // );
 
         let left = self.player.angle + (self.horiz_fov / 2.0);
         let step = self.horiz_fov / self.w;
@@ -211,11 +214,16 @@ impl Engine {
                     p if (p.x.trunc() + p.y.trunc()) % 4.0 == 3.0 => [0.7, 0.3, 0.9, 1.0],
                     _ => [1.0, 0.0, 0.0, 1.0],
                 };
-                println!("ray: {}, angle: {}, wall at {:?}, distance: {}", n, ray_angle, pos, distance);
-                rectangle(wall_color,
-                          [n as f64, (self.h - wall_height) / 2.0, 1.0, wall_height],
-                          context.transform,
-                          graphics);
+                println!(
+                    "ray: {}, angle: {}, wall at {:?}, distance: {}",
+                    n, ray_angle, pos, distance
+                );
+                // rectangle(
+                //     wall_color,
+                //     [n as f64, (self.h - wall_height) / 2.0, 1.0, wall_height],
+                //     context.transform,
+                //     graphics,
+                // );
             };
         }
 
@@ -241,7 +249,7 @@ impl Engine {
                 Movement::Backward => {
                     self.player.pos.x -= self.player.angle.to_radians().cos() * dt;
                     self.player.pos.y -= self.player.angle.to_radians().sin() * dt;
-                },
+                }
                 Movement::TurnLeft => {
                     self.player.angle += 90.0 * dt;
                     self.player.angle = (self.player.angle + 360.0) % 360.0;
@@ -251,8 +259,14 @@ impl Engine {
                     self.player.angle = (self.player.angle + 360.0) % 360.0;
                 }
             }
-            if !self.level.contains(self.player.pos) || self.level.tile_at(self.player.pos) == Tile::Wall {
-                println!("Invalid position {:?}, tile = {:?}", self.player.pos, self.level.tile_at(self.player.pos));
+            if !self.level.contains(self.player.pos)
+                || self.level.tile_at(self.player.pos) == Tile::Wall
+            {
+                println!(
+                    "Invalid position {:?}, tile = {:?}",
+                    self.player.pos,
+                    self.level.tile_at(self.player.pos)
+                );
                 self.player.pos = previous;
             }
         }
@@ -278,31 +292,71 @@ mod tests {
             angle: 0.,
         };
 
-        fcmp(player.player_space_distance(super::Position { x: 4., y: 1. }), 2.);
-        fcmp(player.player_space_distance(super::Position { x: 4., y: 2. }), 2.);
-        fcmp(player.player_space_distance(super::Position { x: 4., y: 3. }), 2.);
+        fcmp(
+            player.player_space_distance(super::Position { x: 4., y: 1. }),
+            2.,
+        );
+        fcmp(
+            player.player_space_distance(super::Position { x: 4., y: 2. }),
+            2.,
+        );
+        fcmp(
+            player.player_space_distance(super::Position { x: 4., y: 3. }),
+            2.,
+        );
 
         player.angle = 90.;
-        fcmp(player.player_space_distance(super::Position { x: 1., y: 4. }), 2.);
-        fcmp(player.player_space_distance(super::Position { x: 2., y: 4. }), 2.);
-        fcmp(player.player_space_distance(super::Position { x: 3., y: 4. }), 2.);
+        fcmp(
+            player.player_space_distance(super::Position { x: 1., y: 4. }),
+            2.,
+        );
+        fcmp(
+            player.player_space_distance(super::Position { x: 2., y: 4. }),
+            2.,
+        );
+        fcmp(
+            player.player_space_distance(super::Position { x: 3., y: 4. }),
+            2.,
+        );
 
         player.angle = 135.;
-        fcmp(player.player_space_distance(super::Position { x: 0., y: 2. }), 2.);
+        fcmp(
+            player.player_space_distance(super::Position { x: 0., y: 2. }),
+            2.,
+        );
 
         player.angle = 180.;
-        fcmp(player.player_space_distance(super::Position { x: 0., y: 1. }), 2.);
-        fcmp(player.player_space_distance(super::Position { x: 0., y: 2. }), 2.);
-        fcmp(player.player_space_distance(super::Position { x: 0., y: 3. }), 2.);
+        fcmp(
+            player.player_space_distance(super::Position { x: 0., y: 1. }),
+            2.,
+        );
+        fcmp(
+            player.player_space_distance(super::Position { x: 0., y: 2. }),
+            2.,
+        );
+        fcmp(
+            player.player_space_distance(super::Position { x: 0., y: 3. }),
+            2.,
+        );
 
         player.angle = 270.;
-        fcmp(player.player_space_distance(super::Position { x: 1., y: 0. }), 2.);
-        fcmp(player.player_space_distance(super::Position { x: 2., y: 0. }), 2.);
-        fcmp(player.player_space_distance(super::Position { x: 3., y: 0. }), 2.);
+        fcmp(
+            player.player_space_distance(super::Position { x: 1., y: 0. }),
+            2.,
+        );
+        fcmp(
+            player.player_space_distance(super::Position { x: 2., y: 0. }),
+            2.,
+        );
+        fcmp(
+            player.player_space_distance(super::Position { x: 3., y: 0. }),
+            2.,
+        );
     }
 
     #[test]
     fn tile_at() {
+        #[rustfmt::skip]
         let tiles = vec![
             Tile::Wall, Tile::Wall, Tile::Wall, Tile::Wall, Tile::Wall,
             Tile::Wall, Tile::Empty, Tile::Empty, Tile::Empty, Tile::Wall,
@@ -313,9 +367,12 @@ mod tests {
         let level = Level {
             width: 5,
             height: 5,
-            tiles
+            tiles,
         };
-        assert_eq!(level.tile_at(super::Position { x: 2.0, y: 2.0 }), Tile::Empty);
+        assert_eq!(
+            level.tile_at(super::Position { x: 2.0, y: 2.0 }),
+            Tile::Empty
+        );
     }
 
     #[test]
@@ -336,6 +393,7 @@ mod tests {
 
     #[test]
     fn closest_point() {
+        #[rustfmt::skip]
         let tiles = vec![
             Tile::Wall, Tile::Wall, Tile::Wall, Tile::Wall, Tile::Wall,
             Tile::Wall, Tile::Empty, Tile::Empty, Tile::Empty, Tile::Wall,
@@ -346,7 +404,7 @@ mod tests {
         let level = Level {
             width: 5,
             height: 5,
-            tiles
+            tiles,
         };
 
         let position = super::Position { x: 2.5, y: 2.0 };
@@ -377,7 +435,8 @@ mod tests {
 
             let right_ray_angle = ((-(n as f64) * step) + 360.0) % 360.0;
             let right_ray_radian = right_ray_angle.to_radians();
-            let (_right_tile, right_pos) = super::closest_point(&level, &position, right_ray_radian);
+            let (_right_tile, right_pos) =
+                super::closest_point(&level, &position, right_ray_radian);
 
             println!("left: {:?}, angle: {}", left_pos, left_ray_angle);
             println!("right: {:?}, angle: {}", right_pos, right_ray_angle);
diff --git a/src/main.rs b/src/main.rs
index 0694c71..e8f9c62 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,19 +1,30 @@
-extern crate piston_window;
-use piston_window::*;
+// extern crate piston_window;
+// use piston_window::*;
+
+extern crate minifb;
+use minifb::{Key, Window, WindowOptions};
 
 mod engine;
 use engine::Tile;
 
+const WIDTH: usize = 320;
+const HEIGHT: usize = 240;
+
 fn main() {
-    let mut window: PistonWindow =
-        WindowSettings::new("Rustenstein", [320, 240])
-        .exit_on_esc(true)
-        .resizable(false)
-        .build()
-        .unwrap_or_else(|e| { panic!("Failed to build PistonWindow: {}", e) });
+    let mut buffer: Vec<u32> = vec![0; WIDTH * HEIGHT];
 
-    let mut engine = engine::Engine::new(window.size());
+    let mut window = Window::new("Rustenstein", WIDTH, HEIGHT, WindowOptions::default())
+        .unwrap_or_else(|e| {
+            panic!("{}", e);
+        });
 
+    // Limit to max ~60 fps update rate
+    window.limit_update_rate(Some(std::time::Duration::from_micros(16600)));
+
+    let (width, height) = window.get_size();
+    let mut engine = engine::Engine::new(width, height);
+
+    #[rustfmt::skip]
     let tiles = vec![
         Tile::Wall, Tile::Wall, Tile::Wall, Tile::Wall, Tile::Wall,
         Tile::Wall, Tile::Empty, Tile::Empty, Tile::Empty, Tile::Wall,
@@ -24,27 +35,33 @@ fn main() {
     let level = engine::Level {
         width: 5,
         height: 5,
-        tiles
+        tiles,
     };
     engine.load_level(level);
 
-    while let Some(event) = window.next() {
-        if let Some(Button::Keyboard(key)) = event.press_args() {
-            match key {
-                Key::W | Key::Up => engine.add_movement(engine::Movement::Forward),
-                Key::S | Key::Down => engine.add_movement(engine::Movement::Backward),
-                Key::A | Key::Left => engine.add_movement(engine::Movement::TurnLeft),
-                Key::D | Key::Right => engine.add_movement(engine::Movement::TurnRight),
-                _ => (),
-            };
-        };
-
-        window.draw_2d(&event, |context, graphics, _device| {
-            engine.render(context, graphics);
-        });
-
-        if let Some(args) = event.update_args() {
-            engine.update(args.dt);
+    while window.is_open() && !window.is_key_down(Key::Escape) {
+        for i in buffer.iter_mut() {
+            *i = 0; // write something more funny here!
         }
+
+        // if let Some(Button::Keyboard(key)) = event.press_args() {
+        //     match key {
+        //         Key::W | Key::Up => engine.add_movement(engine::Movement::Forward),
+        //         Key::S | Key::Down => engine.add_movement(engine::Movement::Backward),
+        //         Key::A | Key::Left => engine.add_movement(engine::Movement::TurnLeft),
+        //         Key::D | Key::Right => engine.add_movement(engine::Movement::TurnRight),
+        //         _ => (),
+        //     };
+        // };
+
+        engine.render(&mut buffer);
+
+        // if let Some(args) = event.update_args() {
+        //     engine.update(args.dt);
+        // }
+
+        // We unwrap here as we want this code to exit if it fails.
+        // Real applications may want to handle this in a different way
+        window.update_with_buffer(&buffer, WIDTH, HEIGHT).unwrap();
     }
 }