43a57379f1
Two results, one of which corrects me. 1. The R1-re-opened 'declared keyframe timeline reproduces the captured splash' resolves in FAVOUR of the declared timeline. Instrument is a disc keyframe table against the guest's vertex stream -- no renderer in the chain, which is what the 'our-reader' tag demanded. Calibration-free test: is each captured alpha an exact member of the declared piecewise-linear value set at integer t? 39/50 exact under truncation, 30/50 under rounding, and the worst error under either rule is ONE alpha level in 255. All 11 non-exact samples are low by exactly 1 and all are on falling segments. The old refutation rested on 'still at a=255 nine frames after its declared a=32' -- under the fixed layout a=32 is at t=206, four units from the end of a 210-unit timeline. That was the off-by-one association. 2. The unit->seconds rate is PER-GAMEPART, which corrects what I told the port an hour ago. Title ~57 units/guest-second; splash ~35-40. The splash figure is confirmed two ways that share no algebra: a 15-unit ramp (T read off the disc, not borrowed) and a 160-unit HOLD, which is a declared duration with no T, no alpha slope and no interpolation in it. And my 'the borrowed T=15 does not apply' was wrong in the other direction: the disc says T=15 plainly. What failed was the premise of a single global rate, not the T. Noted at the foot of that page rather than by editing it. The trap worth recording: all four elements give 650-679 alpha/s, agreeing to 2%, which reads exactly like one clock. It is a coincidence -- T differs 22 vs 15 and the rates differ 57 vs 37, and the ratios nearly cancel. A quantity that looks constant across screens is not evidence of one clock when the thing that would vary is inside it. The hold breaks the tie. For the port: a single keyframe_units_per_second cannot be right, and a splash played at 60 runs 1.5-1.7x too fast -- shorter, sharper fades than the game's, which is the direction the play-test reported.
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.