LibGfx: Add some missing operators to Vector3 Vector4 and Matrix4x4

1 files changed, 19 insertions, 0 deletions

diff --git a/Userland/Libraries/LibGfx/Matrix4x4.h b/Userland/Libraries/LibGfx/Matrix4x4.h
index 16f927d3ce..c1ebdfaaa5 100644
--- a/Userland/Libraries/LibGfx/Matrix4x4.h
+++ b/Userland/Libraries/LibGfx/Matrix4x4.h
@@ -8,6 +8,7 @@
 
 #include <LibGfx/Matrix.h>
 #include <LibGfx/Vector3.h>
+#include <LibGfx/Vector4.h>
 #include <math.h>
 
 namespace Gfx {
@@ -46,6 +47,15 @@ public:
         return product;
     }
 
+    Vector4<T> operator*(const Vector4<T>& v) const
+    {
+        return Vector4<T>(
+            v.x() * m_elements[0][0] + v.y() * m_elements[1][0] + v.z() * m_elements[2][0] + v.w() * m_elements[3][0],
+            v.x() * m_elements[0][1] + v.y() * m_elements[1][1] + v.z() * m_elements[2][1] + v.w() * m_elements[3][1],
+            v.x() * m_elements[0][2] + v.y() * m_elements[1][2] + v.z() * m_elements[2][2] + v.w() * m_elements[3][2],
+            v.x() * m_elements[0][3] + v.y() * m_elements[1][3] + v.z() * m_elements[2][3] + v.w() * m_elements[3][3]);
+    }
+    
     Vector3<T> transform_point(const Vector3<T>& p) const
     {
         return Vector3<T>(
@@ -54,6 +64,15 @@ public:
             p.x() * m_elements[0][2] + p.y() * m_elements[1][2] + p.z() * m_elements[2][2] + m_elements[3][2]);
     }
 
+    static Matrix4x4 identity()
+    {
+        return Matrix4x4(
+            1, 0, 0, 0,
+            0, 1, 0, 0,
+            0, 0, 1, 0,
+            0, 0, 0, 1);
+    }
+
     static Matrix4x4 translate(const Vector3<T>& p)
     {
         return Matrix4x4(