[DllImport(DLL_NAME, EntryPoint = "Mat2Multiply")] public extern static Mat2 Multiply(Mat2 a, Mat2 b);
 [DllImport(DLL_NAME, EntryPoint = "Mat2MultiplyF")] public extern static Mat2 Multiply(Mat2 a, float v);
 [DllImport(DLL_NAME, EntryPoint = "Mat2Subtract")] public extern static Mat2 Subtract(Mat2 a, Mat2 b);