1 files changed, 56 insertions, 0 deletions
diff --git a/azalea-core/src/math.rs b/azalea-core/src/math.rs
new file mode 100644
index 00000000..2e5e78f6
--- /dev/null
+++ b/azalea-core/src/math.rs
@@ -0,0 +1,56 @@
+// TODO: make this generic
+pub fn binary_search(mut min: i32, max: i32, predicate: &dyn Fn(i32) -> bool) -> i32 {
+    let mut diff = max - min;
+    while diff > 0 {
+        let diff_mid = diff / 2;
+        let mid = min + diff_mid;
+        if predicate(mid) {
+            diff = diff_mid;
+        } else {
+            min = mid + 1;
+            diff -= diff_mid + 1;
+        }
+    }
+
+    min
+}
+
+pub fn lcm(a: u32, b: u32) -> u64 {
+    let gcd = gcd(a, b);
+    (a as u64) * (b / gcd) as u64
+}
+pub fn gcd(mut a: u32, mut b: u32) -> u32 {
+    while b != 0 {
+        let t = b;
+        b = a % b;
+        a = t;
+    }
+    a
+}
+
+pub fn lerp<T: num_traits::Float>(amount: T, a: T, b: T) -> T {
+    a + amount * (b - a)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_gcd() {
+        assert_eq!(gcd(0, 0), 0);
+        assert_eq!(gcd(1, 1), 1);
+
+        assert_eq!(gcd(0, 1), 1);
+        assert_eq!(gcd(1, 0), 1);
+
+        assert_eq!(gcd(12, 8), 4);
+        assert_eq!(gcd(8, 12), 4);
+
+        assert_eq!(gcd(12, 9), 3);
+        assert_eq!(gcd(9, 12), 3);
+
+        assert_eq!(gcd(12, 7), 1);
+        assert_eq!(gcd(7, 12), 1);
+    }
+}