2f9f21d7c1
motion-census says in its own header that it cannot do this: "a wrong ramp that moves every frame passes here." So having restored the motion, this checks the shape. Pre-registered from the disc. palogo_sqex_eff declares 0:0 -> 15:255 -> 30:212 -> 45:0, so three straight runs with breakpoints at 15 and 30, the middle slope ~1/5 the magnitude of the last, and the rise ~1.2x the last. Measured from a FILM of a real boot, on the companion's top strip (686x11+299+319) which no other element overlaps, so it is that element's own alpha rather than a composite: units 5.6-13.0 +0.00509 /unit rise units 16-28 -0.00090 /unit gentle fall units 31-43 -0.00423 /unit steep fall unit 46.4 0.00000 gone Breakpoints land where declared: the rise stops between 13.0 and 16.1, the gentle fall steepens between 28.4 and 31.4. ratio middle:last declared 0.203 measured 0.213 (within 5 %) ratio rise:last declared 1.20 measured 1.20 (exact) So the port interpolates piecewise-linearly across the declared segments, which is what the Decoder independently measured the game doing -- 28 distinct alphas over 28 consecutive presents, modal steps -3 and -14 against predicted -2.87 and -14.13. ⚠️ RATIOS, NOT ABSOLUTES, and deliberately. The strip mean is an alpha scaled by the sprite's own pixels; its absolute value carries the texture. A ratio between segments divides that out, which is the only reason the shape is checkable from a composite at all. What this does NOT establish, stated rather than implied: that it LOOKS right -- three instruments have now agreed with a picture a human called wrong, and a fourth agreeing does not change the standing of the fifth. Nor anything about the developer splash's three pairs. Nor the absolute alpha. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018AHUQvXGyNcKonSEWsgWcX
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
-- and RUNNING.md, which is how you actually start it
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.