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James Dansereau
978306d14f
D73 (root cause of old D72.3): GE's sinf/cosf build their double
constants through the du bit-union with big-endian word pairs {hi,lo};
on LE PC the .d read has the words swapped (rpi.d ~ 2^733), range
reduction overflows, and FTOFIX32 saturates to -32768 for every
sin/cos entry of guMtxF2L — so the Rareware logo's rotation matrix was
garbage and all its triangles projected off-screen. Fix: DVAL() macro
in src/libultra/gu/guint.h (PORT-only; #else branch is the original
expression) re-packing hi/lo into the correct LE double; sinf.c/cosf.c
.d reads replaced. N64 build untouched.
D74 (texture side, three port-layer bugs in fast3d):
- import_texture's fallback condition (rdp.tex_lod && tile >=
first+detail) overwrote valid gDPLoadBlock tmem data with
line*tile.height: letter mip chains 2744B -> 2048B (mips 1-5 dropped),
D_02005FF0 32x32 -> 32x3 (stale tile.height from gsDPSetTileSize).
Now falls back only when the tmem slot was never written.
- TextureCacheKey gains size_bytes so a truncated first import cannot
poison later full imports of the same address.
- VBO UV path now wraps by TILE size for WRAP sub-tiles (N64 semantics);
the logo's 20x3 tile at offset (11.5,29) was sampling row 0 instead
of rows 29-31. Per-vertex pre-wrap; known limits: half-texel edge
bleed, mirror sub-tiles unhandled.
Verified: clean runs reach frame ~2100 then hit the D69 load_bg_file
fault (unchanged — still the milestone blocker); PPM frame ~555 shows
the four gold RARE letters on the dark-blue plate (final pixel-perfect
check vs N64 footage left as a low-priority task). All env-gated probes
from this session (GE_DBGUV/DBGTRI/DBGTALL/DBGMAT/D74IMP/D74DUMP/
GE_DBGLOAD) stripped; previously committed TEMP D63 blocks + GE_D71LOG
remain on the HANDOFF strip list.
Docs: PCPortResearch.md §F D73/D74 entries, §G/§H status updated;
HANDOFF.md rewritten for Session I (D69 primary); AGENTS.md phase line.