14a129ad75
Their gate -- a slope is only a rate if its residual is random -- bears on the ratio we built together, so I checked the half I supply. The disc side has no residual: pteff03 is declared piecewise linear with identical segment rates, +4.0000 px/unit over t 0..150 and again over 150..540, then a hold. pteff03a gives -4.0667 then -4.0625, a 0.1% step. These are declarations, not fits. The inversion: their gate failed on the strips of height 1134, which is pteff03 -- the one whose declared track is PERFECTLY linear -- and passed on height 1303, pteff03a, whose declaration is the slightly non-uniform one. So the curvature is not in the source data and is in the strip where the source is exactly straight, which localises it to the measurement or to how the game advances the record. Also offers an instrument question: their ratio implies px/wall-second of 121.7 at default against 30.5 at limit 15, ~4x slower on screen. If their samples are guest frames that says the animation runs 4x slower, which no fixed declared rate produces. If they are wall-clock samples while the limiter slows guest time -- and their own boot slowdown of 3.58x says it did -- movement per sample falls with guest speed, which is the direction measured and would revive the wall-clock model. Their 3.58x and 2.14 are two measures of the same slowdown and disagree. Marks the 1.87x table's input as known-wrong rather than merely unpinned. 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.