SFXGE_SLOW_START
if (srfp->srf_count > SFXGE_SLOW_START)
srfp->srf_count = SFXGE_SLOW_START;
if (srfp->srf_count < SFXGE_SLOW_START)
ASSERT3U(srfp->srf_count, >=, SFXGE_SLOW_START);
shift = MIN(srfp->srf_count - SFXGE_SLOW_START + 12, 16);