4226505222
The Decoder's finding, applied. `rest()` returns each element's last hold keyframe chosen independently of every other element: right for anything that ends the screen settled, exactly wrong for a transient. The title's ptlogo_back2eff1 is a two-frame flash (0 until t52, 255 at t54-56, 0 by t58), so its last hold IS the flash peak and rest() left it burning -- five of them, drawn at once. The settled instant is the longest interval containing no keyframe time, over a bundle's TOP-LEVEL elements. Reproduced here before adopting: title [160, 236], midpoint 198, the Decoder's number to the unit. The top-level restriction is what makes it match -- including the ptloop leaves gives [269, 540]. AGAINST THE ORACLE: title 20.92 RMSE 1.81% -> 14.61 RMSE 0.26% publisher_logo 9.05 0.75% -> 2.17 0.01% developer_logos 8.86 0.33% -> 3.05 0.01% main_menu 0.08% -> 0.08% window too narrow extras 0.19% -> 0.19% window too narrow Seven times fewer differing pixels on the title, seventy-five times fewer on the publisher splash, whose differing region is now a 13x18 box. The largest correctness gain this port has had, and none of it is mine -- it is a decode computed from the keyframe table with no reference to any capture. APPLIED ONLY WHERE THE WINDOW IS WIDE, and the bar is not invented. This export's widths split with nothing in between: 214, 190, 145, 76, then 12, 12, 8, 4. The bar is 30 units -- the Decoder's disc-wide census puts the knee there (30% of bundles >= 30, 42% under 10, the latter mostly loop* fragments meant to be in motion) and this export's screens sit 4x either side with nothing between 12 and 46. Two independent populations agreeing on where to cut. Checked unbroken: boot pacing unmoved, scripted walk runs end to end with focus restored. Also recorded: my "34 focus-record elements, only 2 varying" is right for GP_TITLE and reads as a fact about the format -- disc-wide it is 210 varying, 202 with rest() at the peak, concentrated in the paks a wider port reaches next. And their sharper framing, which I have adopted: a pulsing element has no resting pose at all, so rest() is MALFORMED rather than mis-answered on one. 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.