Switch to layer matrix instead of layer list

lib/src/atomics.rs

@@ -0,0 +1,28 @@
+use atomic_polyfill::{AtomicU32, Ordering};
+
+pub struct AtomicCoord {
+    inner: AtomicU32,
+}
+
+impl AtomicCoord {
+    pub const fn new() -> Self {
+        AtomicCoord {
+            inner: AtomicU32::new(0),
+        }
+    }
+
+    pub fn load(&self, ordering: Ordering) -> (u16, u16) {
+        let [a, b, c, d] = self.inner.load(ordering).to_ne_bytes();
+        let x = u16::from_ne_bytes([a, b]);
+        let y = u16::from_ne_bytes([c, d]);
+
+        (x, y)
+    }
+
+    pub fn store(&self, x: u16, y: u16, ordering: Ordering) {
+        let [a, b] = x.to_ne_bytes();
+        let [c, d] = y.to_ne_bytes();
+        let xy = u32::from_ne_bytes([a, b, c, d]);
+        self.inner.store(xy, ordering);
+    }
+}