# Waiting on the RE agent

What this port cannot do until an answer lands in
[`/reborn/docs/port/HANDOFF.md`](https://git.mc02.dev/fabi/Syplheed-Reborn).
Recorded so it is not re-discovered every iteration.

**None of these may be guessed.** A value invented here is indistinguishable from
a decoded one a month from now. Where a milestone can proceed with a placeholder,
the placeholder goes in `authored/` with a `why` naming the question it stands in
for, so it is deleted rather than forgotten when the answer arrives.

Last reconciled against HANDOFF.md on **2026-08-28**, at `/reborn` HEAD `e81dcad`.

## Still open — these block work

| Milestone | Needs | HANDOFF | State |
|---|---|---|---|
| P6 audio | which cue fires on move / confirm / back | Q8 | ❔ open. The cue table is complete; the **event binding is not**. P6 cannot bind a sound to a keypress without inventing it. |
| P6 audio | which BGM the menu plays | Q10 | ❔ **not on the disc.** All 32 banks are named `BGM_001`…`BGM_109` with no semantic name anywhere. The port is choosing a track, and that choice is authored. |
| P6 looping | where a menu loop restarts | Q10 | ❔ `BGM_001` fades out at 167.663 s into 6.15 s of silence, and no loop-point field has been identified. A menu loop is authored. |
| P4/P7 video | whether Ⓐ skips a movie | Q9 | 🟡 unsettled — the corpus says Ⓐ skips every time, the boot harness never taps during a movie because it breaks the title. P4 can play the movie; it cannot yet say what a button press does during one. |
| P5 `NEW GAME` | what Ⓐ on `NEW GAME` opens | Q4 | ❔ untested: Ⓐ on it **hangs the emulator**. The other four destinations are measured. |
| P3 sequencing | what code decides to advance the boot sequence | Q6 | 🟡 the order is observed and the attract cycle timed (~8–10 s idle → fade → `ADV.wmv` in full → title). The *driver* is not decoded. P3 can reproduce the observed behaviour and must say it is reproducing an observation. |

## Answered since this file was last written — no longer blocking

Q1 (keyframe time unit — linear ramp, 2 units per rendered frame, 1 unit = 1/60 s
*measured*), Q2 (which build is which screen), Q3 (paint order — a `u16` layer key
at `+0x0A`, **decoded**), Q5 (navigation: ⬆⬇ wrap, ⬅➡ nothing, Ⓑ up with focus
restored), Q7 (transitions: a fade through black, fade-in decoded, ~0.4 s fade-out
measured), Q9 (`ADVERTISE_MOVIE` → `ADV.wmv` is boot intro *and* attract; `MS00A` →
`S00A.wmv` is the new-game intro), Q10 (a bank is two stems played **together** —
do not concatenate), S1 (Ready Room: no-go).

Three of those are **measured**, not decoded, and so are authored here rather
than exported:

| Authored because it is not on the disc | HANDOFF | Where it lives |
|---|---|---|
| `1 keyframe unit = 1/60 s` | Q1 | not yet written — P2 |
| initial menu focus (not stable across boots; pick one and say so) | Q5 | not yet written — P5 |
| the ~0.4 s fade-out and the 0.17–0.23 s black hold | Q7 | not yet written — P3 |

## Questions this port has raised

Not blocking anything today; raised because the port found them and a guess here
would be believed later.

### The pivot is not half the texture on `GP_TITLE`

`sylpheed-formats`'s `ui_layout::Element::pivot_x` is documented as "for a `.t32`
element this is exactly half the decoded texture's dimensions (verified 7/7 on
the tutorial bundle)". Counting it over the whole of `GP_TITLE` as exported:

* **55 of 93** sprite-bearing `.t32` elements match within ±1 px.
* **38 do not**, and several are not close: `ptlogo_back2` is 1118×262 with pivot
  (500, 117) where half is (559, 131); `ptmsg` is 223×38 with pivot (123, 19)
  where half is (111.5, 19) — the Y matches and the X does not.

This changes nothing today: the exporter emits the **declared** pivot and never
derives one, and the pivot only affects drawing when scale ≠ 100 %. But it does
matter, because scale is genuinely animated here — **177 keyframes** across
`GP_TITLE` are not 100 %, including on the title screen the port must draw at P1.

The question for the RE agent, when it is cheap to answer: **does the running
game anchor a scale to the declared pivot, or to half the texture?** The two
differ by up to 59 px on `ptlogo_back2`, which is visible. Until then the port
follows the decoders and uses the declared pivot, which is also what
`sylpheed-cli screen render` does — so a P1 diff cannot distinguish them, and
agreement between the two is not evidence.