955f5b0c02
The Decoder censused rest()'s dwell fallback from the file side: 2305 elements have no plateau, 1697 of those get a visible pose, and in GP_TITLE all four visible fires are on the splash screens this port ships. Confirmed in my export. Refinement to their description: they named the [0:a0 15:a255 30:a212 45:a0] shape, but palogo_gamearts_eff and palogo_seta_eff hold 255 through t=30, so their fallback lands on the flash PEAK rather than its decay. Same defect, worse pose. The port ships the right frame and there is now a number for it. Publisher splash against the committed oracle capture: timeline (shipped) RMSE 2.17 / 0.01% differing; --pose=rest 9.05 / 0.75% -- 75x the differing area on a screen I ship. So the rule added to verify-screen's header after the title_jp mistake generalises, and is demonstrated against an oracle rather than argued. What did need fixing: ScreenView logged '(transparent at rest)' for every skipped element whatever instant it posed, so it said that about palogo_sqex_eff, whose resting alpha is 212. That is the same rest-versus-posed-instant confusion that cost a wrong conclusion, pre-printed in the log. It now names the instant. Controlled both ways: timeline says 'at t=6' and skips the flash, --pose=rest still says 'at rest' and draws it. 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.