Turns tfrag positions into drawable geometry. Every unpack in a patch's
VIF lists is now classified by format *and* destination VU address, using
the VU header at the head of the common list. That table is what tells
the strips from the indices from the parent arrays: they are all V4_8
and only the address distinguishes them.
Strip indices address the vertex-info array, not the position array.
Several vertex-info entries can share a position, so an index resolves
through vertex_info[i].vertex / 2 to reach a position. Vertex-info also
carries UVs and the LOD parent link.
A strip run of n vertices is a GS triangle strip of n - 2 triangles with
alternating winding. The vertex count is biased by -128 when negative,
and the first record of a list is always biased even when positive --
real patches open with -116 or -124, never a small positive number.
tri_count lives in the patch header and cannot be derived from the lists
without walking them, so reproducing it is a strong check: all 27 levels,
18,102 patches, 809,879 triangles, every patch matching its header, every
triangle index inside its LOD's vertex-info range.
Four wrong turns got there, each of which failed quietly rather than
loudly: reading the element size from the immediate instead of the
command, 2-byte payload padding instead of 4, ignoring the inline
payload of STROW/STCOL/STMASK/MPG/DIRECT, and banking strips by arrival
order instead of by LOD. Every one produced parseable, plausible geometry.
Only the header's own triangle count caught them.
Still open: ad-gif texture bindings, per-vertex RGBA and light records,
and the LOD switch and morph rules.
ReaperOfVeriod
9459f15329