pub unsafe extern "C" fn graphene_point3d_cross(
a: *const graphene_point3d_t,
b: *const graphene_point3d_t,
res: *mut graphene_point3d_t,
)
pub unsafe extern "C" fn graphene_point3d_cross(
a: *const graphene_point3d_t,
b: *const graphene_point3d_t,
res: *mut graphene_point3d_t,
)