add maths utils

include/Defines.h

@@ -15,7 +15,6 @@ struct Vec2 {
 	};
 
 	constexpr Vec2(T X = 0, T Y = 0) : x(X), y(Y) {}
-
 };
 
 template<typename T>
@@ -48,6 +47,37 @@ inline bool operator==(const Vec3<T>& vec3, const Vec3<T>& other) {
 	return vec3.x == other.x && vec3.y == other.y && vec3.z == other.z;
 }
 
+template<typename T>
+struct Vec4 {
+	union {
+		T x;
+		T r;
+	};
+
+	union {
+		T y;
+		T g;
+	};
+
+	union {
+		T z;
+		T b;
+	};
+
+	union {
+		T w;
+		T a;
+	};
+
+	constexpr Vec4(Vec3<T> vec, T W = 1) : x(vec.x), y(vec.y), z(vec.z), w(W) {}
+	constexpr Vec4(T X = 0, T Y = 0, T Z = 0, T W = 0) : x(X), y(Y), z(Z), w(W) {}
+};
+
+template<typename T>
+inline bool operator==(const Vec4<T>& vec4, const Vec4<T>& other) {
+	return vec4.x == other.x && vec4.y == other.y && vec4.z == other.z && vec4.w = other.w;
+}
+
 using Vec2i = Vec2<int>;
 using Vec2u = Vec2<unsigned int>;
 using Vec2f = Vec2<float>;
@@ -58,6 +88,11 @@ using Vec3u = Vec3<unsigned int>;
 using Vec3f = Vec3<float>;
 using Vec3d = Vec3<double>;
 
+using Vec4i = Vec4<int>;
+using Vec4u = Vec4<unsigned int>;
+using Vec4f = Vec4<float>;
+using Vec4d = Vec4<double>;
+
 using Color = Vec3<unsigned char>;
 
 } // namespace td