[sldev] Meaning of RequestImage DiscardLevel field?

[John Hurliman]

I know that the DiscardLevel field in the RequestImage packet is used to
request different quality levels (not different texture sizes as the
protocol documentation states, SL uses LRCP ordered JPEG2000 files), but i
can't figure out what the values correspond to. In a typical texture
download I'll see values ranging from -1 to 5. Is -1 a special value? Is
there an upper limit? Does a larger number mean a lower quality layer?

John
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