const LogicSegment::MipMapLevel &m0 = s.mip_map_[0];
BOOST_CHECK_EQUAL(m0.length, 1);
BOOST_CHECK_EQUAL(m0.data_length, LogicSegment::MipMapDataUnit);
const LogicSegment::MipMapLevel &m0 = s.mip_map_[0];
BOOST_CHECK_EQUAL(m0.length, 1);
BOOST_CHECK_EQUAL(m0.data_length, LogicSegment::MipMapDataUnit);