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Two more emulator runs close two of the three reach limits on the blend page. THE TITLE (entries 4 + 2 composited). Everything alpha-over except the two rotated sweep strips and -- the finding -- ptbtn00f, the PRESS (A) plate's focused variant, which is ADDITIVE while its own base ptbtn00 is not. That is what the documented plate pulse is made of, and a port drawing both alpha-over cannot reach the pulse's peak by any pacing. And ptlogo_back2 / ptlogo_back2eff are ALPHA-OVER. They are frame-shaped, large, dark and 94 %/87 % transparent -- every surface property the menu's ptframe* have -- so 'frame-shaped and mostly transparent implies additive' is refuted on the one screen that could test it. THE MENU replicates draw for draw in two further sessions; the one-session caveat is retired. THE VERTEX CAP was 8 = two quads, so a batched draw reported its first two elements and dropped the rest. Raised to 64. This is why ptframe4, pteff21, pteff22 and pteff23 looked like elements the game never draws: EXTRAS' 24-index additive draw holds six quads and the log printed two. THE SWEEPS are on screen on the main menu in every captured frame, stepping ~0.03 NDC per frame in opposite directions with their vertex alpha ramping, at different phases in two sessions. The leaf group runs on the menu. What that does not say is how much they contribute. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
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.