0ba7542547
"Looks good! Cannot notice any obvious difference from the actual game.
Mark logos as done." -- 2026-09-02
Not "the check passes": a person compared the port against the real game and
could not tell them apart. That is the oracle, and it is the strongest result
this port has produced. The sole-focus order is lifted; both agents return to
their milestones.
The fix was one word -- pose_at ASSIGNED the settle instant instead of clamping
to it, so every query returned the settled pose whatever the clock said. The
same line manufactured the false green: the capture harness shoots after two
frames, so it was photographing t~=2 units, which looked settled only because
everything looked settled. The 0.01 % agreement that closed H2 was measured
through the accident. One bug produced the defect AND the evidence of its
absence.
Verified here before it went to the human, by film rather than by claim:
motion 16.4 % -> 27.7 %, distinct luma states 26 -> 43, the publisher ramp 6
steps -> 13 in one continuous run, and the developer splash's interrupting
0.50 s freeze gone. The publisher trajectory rises to a peak and settles back --
the crossfade signature.
The port then closed a gap motion-census names in its own header ("a wrong ramp
that moves every frame passes here") with a shape check pre-registered from the
disc, measured off a film, on a non-overlapped strip, in ratios so the texture
divides out: rise:last declared 1.20, measured 1.20 exact.
Kept as the standing lesson, because it is the fourth instance: an instrument
that sits below the thing under test cannot see it fail. Ask of any new check
what it would still report if the feature were entirely absent.
Explicitly NOT claimed: P5's gate is "a human clicks through it" and nobody has
said the milestone is met. The briefs say so, and say not to record it on the
human's behalf.
The decoder's end-to-end pipeline work returns to normal priority rather than
being dropped -- it is what decides whether the port's 60 units/s matches the
game. The ramp is now right in SHAPE and unverified in DURATION.
Sylpheed
A clean-room reverse engineering and port project for Project Sylpheed: Arc of Deception (Xbox 360, 2007).
Three things live here, in one repository so that a change spanning them lands as one commit:
| The decoders | crates/sylpheed-formats — the disc's formats, read and verified disc-wide |
| The port | port/ — a Godot 4 project, plus crates/sylpheed-export which converts a disc into the open asset tree it reads |
| The corpus | docs/re/ — what has been reverse engineered, with its evidence, its retractions and its dead ends |
You need your own copy of the game. No game content is in this repository and none ever will be. The exporter reads the disc you supply.
The oracle is the real game
sylpheed-cliand the Explorer are tools for verifying our decoding. They are hypotheses under test and they have been wrong. When something must be checked against the truth, the truth is the game running in Xenia Canary, captured — not any renderer of ours.
This is stated first because getting it backwards is the most expensive mistake this project has made.
Layout
crates/
sylpheed-formats/ the decoders. Disc-wide verified; the corpus is its spec
sylpheed-cli/ headless tools -- render a screen, dump a table, probe audio
sylpheed-viewer/ the Explorer: a human's window onto the disc. STATIC data only
sylpheed-export/ disc -> the open, moddable asset tree
port/ the Godot 4 project. Reads open formats ONLY
authored/ decisions that are NOT on the disc, each with its reason
data/
base/ generated by the exporter. Gitignored, never hand-edited
mods/ drop-in overrides. Yours
docs/
re/ the corpus: findings, refutations, method traps
game/ how the game is navigated -- menus, modals, flight
port/ the port's mission, its handoff contract, modding rules
agents/ how the agent team works together
tools/ capture harnesses, probes, the share tool
exchange/ transient inter-agent files. NOT in git
docker/ the agent containers
Where to start
docs/re/INDEX.md— what is decodeddocs/re/REFUTED.md— what has been tested and dieddocs/re/METHOD.md— traps this project has already paid fordocs/game/navigation.md— how the game is navigateddocs/port/MODDING.md— why the asset tree looks the way it does
Xenia Canary is a separate repository: it is a fork tracking upstream, and it carries our instrumentation.
Conventions
Confidence is per claim, never per document: ✅ CONFIRMED · 🟡 PROBABLE ·
❔ HYPOTHESIS · ❌ REFUTED. A withdrawn result is kept with its reasoning
rather than deleted — that is why the numbers here can be trusted.