78328c5022
Measured in the title draw capture, re-read with the per-quad parser. GP_TITLE build 4 declares t = 0..269, about 120 presented frames at this run's pacing. The title dwell lasted ~1100. ptcopyright declares alpha >= 1 for 106 units (t=138..244) and is drawn for 1050 frames; ptlogo1 declares an exit at t=264 and is drawn for 1095. Both vanish within three frames of the dwell ending. So the top-level clock advances through the build-in, stops inside the settle window [160,236], and holds. The exit ramp is not played on a timer -- it plays when something makes the screen leave. That is ui-settle-time.md's decode seen from the other side and observed in the running game rather than inferred from the file. A nested record keeps looping on its own clock throughout. This closes the 114-vs-120 gap, and it was my arithmetic rather than a discrepancy in the decode. The 2.231 units/frame was regressed over BUILD-IN events -- the only stretch in which the top-level clock advances -- and applied to a period measured over the settled dwell, where that clock is frozen and only the plate's own record is running. Two different clocks. The declared 120 was never in doubt from the calibration-free dark-fraction test. The 51.158-frame period is now confirmed by a second independent estimator: autocorrelation returns lag 51 with clean harmonics at 102 and 154. Its FIRST version failed its control, returning 48 for a period known to be 51.158, because it indexed by sample position where the log's frame numbers have gaps. Recorded, because the failure is the reason the second version can be trusted. Not settled: the sweeps' period. The same validated estimator disagrees between two dwells of one screen -- 515 vs 452 frames for the same family -- and a 14% disagreement within one screen is not a period. The +0x08 field cannot settle it either, since ptloop01/ptloop02 have zero slack. Blocker recorded in CONTAINER-NOTES: a single A press on the title faults the guest. Three menu-capture attempts, two ending in register dumps of 223 MB and 519 MB, against three no-input runs in the same session that all completed. And a guest fault writes an UNBOUNDED register dump to stdout on a filesystem at 91%, so any scripted button press needs a size guard. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QsEPXWVaEpyfudtR6re1Pd
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.