pub unsafe extern "C" fn graphene_point3d_dot(
a: *const graphene_point3d_t,
b: *const graphene_point3d_t,
) -> c_float
pub unsafe extern "C" fn graphene_point3d_dot(
a: *const graphene_point3d_t,
b: *const graphene_point3d_t,
) -> c_float