Eina 3x3 Matrix
Since 1.22
struct @extern Eina.Matrix3 { xx: double; xy: double; xz: double; yx: double; yy: double; yz: double; zx: double; zy: double; zz: double; }
typedef struct _Eina_Matrix3 { double xx; double xy; double xz; double yx; double yy; double yz; double zx; double zy; double zz; } Eina_Matrix3;