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FLOATING-POINT INSTRUCTIONS
viewer. One array contains distances that correspond to points that are to be drawn; the
other contains distances that correspond to points that have already been drawn (a
Z-buffer). The instructions compare the distances of the points to be drawn against the
values in the Z-buffer and set bits of PM to indicate which distances are smaller than
those in the Z-buffer. Previously calculated bits in PM are shifted right so that consecu-
tive
fzchks or fzchkl
instructions accumulate their results in PM. Subsequent
pst.d
instructions use the bits of PM to determine which pixels to update.
6-31
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