From c0922efdf70ce2e830178e41b39d7424ed727d84 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sun, 13 Sep 2026 17:10:52 +0200
Subject: feat(engine): add naive matrix multiplication by ref fns

---
 engine/src/data_types/matrix.rs | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

(limited to 'engine')

diff --git a/engine/src/data_types/matrix.rs b/engine/src/data_types/matrix.rs
index e28c73f..a1e9bb6 100644
--- a/engine/src/data_types/matrix.rs
+++ b/engine/src/data_types/matrix.rs
@@ -292,6 +292,45 @@ where
     type Output = Matrix<Value, ROWS, RHS_COLUMNS>;
 
     fn mul(self, rhs: Matrix<Value, ROWS, RHS_COLUMNS>) -> Self::Output
+    {
+        &self * &rhs
+    }
+}
+
+impl<Value, const ROWS: usize, const COLUMNS: usize, const RHS_COLUMNS: usize>
+    Mul<&Matrix<Value, ROWS, RHS_COLUMNS>> for Matrix<Value, ROWS, COLUMNS>
+where
+    Value: Mul<Output = Value> + Add<Output = Value> + Default + Copy,
+{
+    type Output = Matrix<Value, ROWS, RHS_COLUMNS>;
+
+    fn mul(self, rhs: &Matrix<Value, ROWS, RHS_COLUMNS>) -> Self::Output
+    {
+        &self * rhs
+    }
+}
+
+impl<Value, const ROWS: usize, const COLUMNS: usize, const RHS_COLUMNS: usize>
+    Mul<Matrix<Value, ROWS, RHS_COLUMNS>> for &Matrix<Value, ROWS, COLUMNS>
+where
+    Value: Mul<Output = Value> + Add<Output = Value> + Default + Copy,
+{
+    type Output = Matrix<Value, ROWS, RHS_COLUMNS>;
+
+    fn mul(self, rhs: Matrix<Value, ROWS, RHS_COLUMNS>) -> Self::Output
+    {
+        self * &rhs
+    }
+}
+
+impl<Value, const ROWS: usize, const COLUMNS: usize, const RHS_COLUMNS: usize>
+    Mul<&Matrix<Value, ROWS, RHS_COLUMNS>> for &Matrix<Value, ROWS, COLUMNS>
+where
+    Value: Mul<Output = Value> + Add<Output = Value> + Default + Copy,
+{
+    type Output = Matrix<Value, ROWS, RHS_COLUMNS>;
+
+    fn mul(self, rhs: &Matrix<Value, ROWS, RHS_COLUMNS>) -> Self::Output
     {
         // https://en.wikipedia.org/wiki/Matrix_multiplication
 
-- 
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