2 files changed, 25 insertions, 14 deletions

diff --git a/src/math/mat4.cpp b/src/math/mat4.cpp
index f1f28b7..b9dff15 100644
--- a/src/math/mat4.cpp
+++ b/src/math/mat4.cpp
@@ -22,6 +22,7 @@ Matrix4 Matrix4::translate(Vector3 v) {
         0.f, 0.f, 0.f, 1.f,
     };
 }
+
 Matrix4 Matrix4::scale(float fac) {
     return {
         fac, 0.f, 0.f, 0.f,
@@ -31,6 +32,15 @@ Matrix4 Matrix4::scale(float fac) {
     };
 }
 
+Matrix4 Matrix4::scale(Vector3 facs) {
+    return {
+        facs.x,    0.f,    0.f, 0.f,
+           0.f, facs.y,    0.f, 0.f,
+           0.f,    0.f, facs.z, 0.f,
+           0.f,    0.f,    0.f, 1.f,
+    };
+}
+
 Matrix4 Matrix4::rot_x(float a) {
     float c = std::cos(a);
     float s = std::sin(a);
@@ -73,11 +83,11 @@ Matrix4 Matrix4::projection(float aspect_ratio, float min_z, float max_z) {
     }};
 }
 
-Matrix4 Matrix4::operator+() {
+Matrix4 Matrix4::operator+() const {
     return *this;
 }
 
-Matrix4 Matrix4::operator-() {
+Matrix4 Matrix4::operator-() const {
     return {
         -values[ 0], -values[ 1], -values[ 2], -values[ 3],
         -values[ 4], -values[ 5], -values[ 6], -values[ 7],
@@ -86,7 +96,7 @@ Matrix4 Matrix4::operator-() {
     };
 }
 
-Matrix4 Matrix4::operator+(Matrix4 m) {
+Matrix4 Matrix4::operator+(Matrix4 m) const {
     return {
         values[ 0] + m.values[ 0], values[ 1] + m.values[ 1], values[ 2] + m.values[ 2], values[ 3] + m.values[ 3],
         values[ 4] + m.values[ 4], values[ 5] + m.values[ 5], values[ 6] + m.values[ 6], values[ 7] + m.values[ 7],
@@ -95,11 +105,11 @@ Matrix4 Matrix4::operator+(Matrix4 m) {
     };
 }
 
-Matrix4 Matrix4::operator-(Matrix4 m) {
+Matrix4 Matrix4::operator-(Matrix4 m) const {
     return *this + (-m);
 }
 
-Matrix4 Matrix4::operator*(Matrix4 m) {
+Matrix4 Matrix4::operator*(Matrix4 m) const {
     Matrix4 ret;
     for (int i = 0; i < 4; i++) {
         for (int j = 0; j < 4; j++) {
@@ -111,7 +121,7 @@ Matrix4 Matrix4::operator*(Matrix4 m) {
     return ret;
 }
 
-Vector4 Matrix4::operator*(Vector4 v) {
+Vector4 Matrix4::operator*(Vector4 v) const {
     return {
         values[ 0] * v.x + values[ 1] * v.y + values[ 2] * v.z + values[ 3] * v.w,
         values[ 4] * v.x + values[ 5] * v.y + values[ 6] * v.z + values[ 7] * v.w,
@@ -120,7 +130,7 @@ Vector4 Matrix4::operator*(Vector4 v) {
     };
 }
 
-std::array<Vector4, 4> Matrix4::to_vecs() {
+std::array<Vector4, 4> Matrix4::to_vecs() const {
     return {{
         { values[ 0], values[ 4], values[ 8], values[12] },
         { values[ 1], values[ 5], values[ 9], values[13] },
diff --git a/src/math/mat4.h b/src/math/mat4.h
index 66d6cd2..35b1ad2 100644
--- a/src/math/mat4.h
+++ b/src/math/mat4.h
@@ -11,6 +11,7 @@ class Matrix4 {
         static Matrix4 idty();
         static Matrix4 translate(Vector3 v);
         static Matrix4 scale(float fac);
+        static Matrix4 scale(Vector3 facs);
         static Matrix4 rot_x(float a);
         static Matrix4 rot_y(float a);
         static Matrix4 rot_z(float a);
@@ -18,13 +19,13 @@ class Matrix4 {
 
         std::array<float, 16> values;
 
-        Matrix4 operator+();
-        Matrix4 operator-();
-        Matrix4 operator+(Matrix4 m);
-        Matrix4 operator-(Matrix4 m);
-        Matrix4 operator*(Matrix4 m);
-        Vector4 operator*(Vector4 v);
-        std::array<Vector4, 4> to_vecs();
+        Matrix4 operator+() const;
+        Matrix4 operator-() const;
+        Matrix4 operator+(Matrix4 m) const;
+        Matrix4 operator-(Matrix4 m) const;
+        Matrix4 operator*(Matrix4 m) const;
+        Vector4 operator*(Vector4 v) const;
+        std::array<Vector4, 4> to_vecs() const;
 };
 
 Matrix4 operator*(float fac, Matrix4 m);