93a587b7c0
sylpheed-port found their main_menu row drifting 13.25-13.30 across runs on a free-running spin clock, and made the general point that a margin only means something against the noise it sits on. My --at plateau measures the RENDER axis; it says nothing about how much the score moves between two CAPTURES of the same screen, which is what a single JP grab is exposed to. Measured from two independent captures of the settled EN title at different phases of its free-running plate pulse, scored against one render: whole frame peak 31.302 trough 28.463 spread 2.839 inside the box peak 21.230 trough 21.230 spread 0.000 The zero carries its control: the two captures differ by 83 496 px whole-frame (max |d| 174), so they are genuinely different grabs, and by 0 inside the box -- the screen's free-running element is the plate, which lies outside the logo region the adjudication uses. Margins re-stated: stale-vs-fixed 16.7 is 14x the render noise and >=5.9x the whole-frame capture noise, so the era result survives on both axes. And the settle-vs-rest negative is STRONGER than first stated: 1.5 is not merely inside the render plateau's 1.2 flatness, it is below the whole-frame capture spread of 2.8 as well. Reach recorded: this transfers the EN title's capture noise to the JP title's box, and build 7 carries ptloop01/02.rat which may animate inside that region where the EN plate does not. A second JP capture would settle it and has not been taken. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
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.