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GS/TC: cross-version probe for the texture-hash divergence (diagnostic)

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The two builds ask for disjoint TEX0 hashes for the same on-screen font -- nine
values on 2.6.6, eight now, no overlap, same palette hash, same PSMT4. Every
function feeding the hash is byte-identical between them, so what differs is the
DATA, and HashCacheKey records only the region's width and height: never where it
starts, never which address it came from, never whether mips were folded in.

Print exactly what the key discards -- TBP0, TBW, TW/TH, the full region rect
including its origin, whether lod was present, and the first bytes actually
hashed -- so two logs can be diffed instead of theorised about.
This commit is contained in:
jpolo1224
2026-08-21 20:40:17 -04:00
parent 7573a3e41f
commit 6375594405
1 changed files with 25 additions and 0 deletions
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pcsx2/GS/Renderers/HW/GSTextureCache.cpp
+25
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@@ -9459,6 +9459,31 @@ GSTextureCache::HashCacheKey GSTextureCache::HashCacheKey::Create(const GIFRegTE
ret.TEX0Hash = FinishBlockHash(hash_st);
// ★ CROSS-VERSION PROBE (diagnostic builds only).
//
// Two builds ask for completely disjoint TEX0 hashes for the same on-screen font: nine values
// on 2.6.6, eight now, no overlap, same palette hash, same 32x32 PSMT4. Every hashing function
// involved is byte-identical between them, so the DATA being hashed differs -- and the key
// records only the region's width and height, never where it starts or which address it came
// from. Print the things the key throws away, so the two logs can be diffed directly instead
// of guessed at.
if (psm.pal != 0) // any paletted texture; the cap below keeps the volume sane
{
static u32 probes = 0;
if (probes < 12)
{
probes++;
Console.WriteLnFmt("TCPROBE tex0hash={:016x} clut={:016x} TBP0={:05x} TBW={} PSM={} TW={} TH={} "
"region=({},{})-({},{}) lod={} first={:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}",
ret.TEX0Hash, ret.CLUTHash, static_cast<u32>(TEX0.TBP0), static_cast<u32>(TEX0.TBW),
static_cast<u32>(TEX0.PSM), static_cast<u32>(TEX0.TW), static_cast<u32>(TEX0.TH),
region.GetMinX(), region.GetMinY(), region.GetMaxX(), region.GetMaxY(),
lod ? 1 : 0,
s_unswizzle_buffer[0], s_unswizzle_buffer[1], s_unswizzle_buffer[2], s_unswizzle_buffer[3],
s_unswizzle_buffer[4], s_unswizzle_buffer[5], s_unswizzle_buffer[6], s_unswizzle_buffer[7]);
}
}
return ret;
}