835acf930e
The previous entry scored verify-screen's title_jp frame against the oracle and concluded the port had moved away from the game. That frame is posed --pose=rest, which the port does not ship. Posed as it runs, the disputed block scores +0.9994 against the reference's +0.8727, and the whole surface +0.9652 against +0.9200 -- holding under gamma compensation and on the English control (+0.9946 vs +0.9560). The port is closer to the game than the reference on both title screens. Mechanism: ptlogo_back2eff1 is (0,0)(98,0)(100,255)(102,255)(104,0) -- a 4-unit sparkle whose rest.t is the peak of its own flash. Six of them stagger across the logo, so --pose=rest fires every sparkle at once. The 25.6% excess light was real and was in a frame nobody sees. verify-screen is not at fault: it poses rest deliberately, so that both renderers read one decoder and the run is a consistency check. I used a consistency-check frame for a correctness question. Its header now says its frames must never be scored against a capture. A second claim in that entry was also wrong -- both screens draw those layers under pose=rest; I had compared a --menu timeline log against a verify-screen rest log and read a mode difference as a screen difference. verify-capture takes a fifth per-row field, a capture crop, because this capture is a full display frame with the surface at +0+45 while the others are pre-cropped. With it title_jp reads RMSE 20.91 / 1.04%, beside title's 14.16 / 0.21%. The row prints 'no capture' until their branch merges. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N7FiFFFwbvG2uxdcEh8HyF
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.