Resolve a pass's requested playback detail (ViewState.ladderDepth) to a
loop bound for THIS ladder. A number goes through normalizeLadderDepth;
'auto' pins the first rung whose cumulative energy fraction e(k) reaches
energyThreshold (the energy_fraction_cum build stamps, one per rung, in
[0, 1], non-decreasing), or the whole ladder if none does; a ladder without
stamps cannot be judged and returns null (time-budgeted streaming). Shared
by the four geometry loaders so 'auto' means the same thing everywhere.
Resolve a pass's requested playback detail (
ViewState.ladderDepth) to a loop bound for THIS ladder. A number goes through normalizeLadderDepth;'auto'pins the first rung whose cumulative energy fraction e(k) reachesenergyThreshold(theenergy_fraction_cumbuild stamps, one per rung, in[0, 1], non-decreasing), or the whole ladder if none does; a ladder without stamps cannot be judged and returnsnull(time-budgeted streaming). Shared by the four geometry loaders so'auto'means the same thing everywhere.