af1d69ed4b
The human listed pulsation as first-class and the port drew nothing: the plate's focus record `ptbtn00f` was never reached, because press_start has no `buttons` and nothing is focused. That it LOOPS is measured -- the corpus timed the period four times (2.12 / 2.19 / 2.34 / 2.31 s) and you cannot measure a period unless the thing repeats. THE RULE I WAS GOING TO WRITE DIED IN THE CENSUS. The spinning ring is a rule in the renderer because it has a disc-wide check: 16 of 212 elements match its shape and all 16 are focus rings. The analogous shape for a pulse -- keyframes varying only in alpha, first alpha equal to last -- matches 82 OF 212, including ptcopyright, palogo_sqex, ptmsg and every _eff fade. A renderer rule on it would make the copyright notice pulse. Narrowed to focus records it matches exactly one distinct element, and a rule justified by n=1 is a special case wearing a rule's clothes. So it is a LOOKUP in authored/timing.json keyed <screen>/<element>, with the census recorded beside it so nobody widens it later. The period is 129 units -- the element's own group under the port's existing model: last timed keyframe t=105 plus the authored exit_ramp_units of 24. No new constant. 2.150 s at 60 units/s, 2.295 s at the ~28.1 fps the emulator presents, against measurements of 2.12-2.34. IT IS A CHOICE AND THE ALTERNATIVE IS STATED: restarting at the group's first keyframe (t=6) instead of 0 gives 123 units = 2.050 / 2.189 s, also inside the measured spread. Nothing separates them. t=0 is taken because it is where every other group starts -- consistency, not evidence. Verified the way the ring was, by bit-identity one period apart. 20 periods is 43.00 s = exactly 172 film frames: frames N and N+172 differ by 0-1/255, while the control a quarter-second off (43.25 s) differs by 58.7/255. On the held boot title the glow-box mean swings 26.0 <-> 37.7. 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.