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re: the decoder eras DO change pixels -- 7 of 16 bundles, and title_jp is one

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The reach test I deferred twice. sylpheed-port tested three screens across the
stale and fixed ui_layout.rs eras, found 0 differing pixels, and concluded the
eras explain nothing. Built both eras from source and rendered EVERY composable
GP_TITLE bundle through each.

7 of 16 differ. Entries 0-6, 8 and 9 are byte-identical -- which includes title
(4), main_menu (5) and extras (6), so the port's result reproduces for the
screens they picked. Entry 7 (title_jp) differs by 74 507 px, RMSE 12.409; the
two loading bundles by 49 771 px, RMSE 10.078; the four splashes by 23-33k px at
RMSE 0.94-1.78.

So "the eras explain nothing" is true for three screens and false for the
archive. It is specifically false for title_jp, which is one of the two rows
their check-all now allows BY NAME with the reason "rest-pose sparkles". Their
measurement of that screen was 0 and mine is 74 507; recorded with exact flags as
a disagreement for them to check, not adjudicated. Noted that their branch's
ui_layout.rs is the stale one (20 ins / 488 del against the pin), so a binary
built from their workspace HEAD is the stale era.

Two controls, both run first. The binaries genuinely embody the eras: build 5's
pteff00.prm reads `rest t=70 [12 70 80 -]` stale against `rest t=12 [0 12 70 80]`
fixed. And the renderer is deterministic: same binary, same flags, twice, 0
differing pixels on entries 7 and 12 -- without which every number is noise.

Mechanism on entry 7 is a single element, ptlogo_eff3.t32, rest (108,72) ->
(98,42). That is the element MISSION.md and ui-resting-pose.md already name as
THE plateau-less rest() discriminator, so the era difference on the JP title is
our existing open question surfacing rather than a new one.

And a trap: entries 10-15 differ by up to 49 771 px with NO rest position change.
The rest selection moves to a keyframe at the same (x,y) with a different scale
and alpha. My first extraction compared only the rest (x,y) column and would have
reported a difference with no cause. A pose is position and scale and alpha.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
This commit is contained in:
sylph-decoder
2026-08-30 14:42:29 +00:00
parent e803930e88
commit 82ce9dbaaa
3 changed files with 155 additions and 3 deletions
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46
docs/re/data/decoder-eras-all-16-builds.txt Normal file
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@@ -0,0 +1,46 @@
# The two decoder eras, rendered: all 16 composable bundles of GP_TITLE.
# 2026-08-30.
#
# STALE era = origin/main (ui_layout.rs: "Keyframe time, or None for the
# group's last frame" -- a pose's time read from the NEXT record)
# FIXED era = formats-pin-2026-08-30 == this branch (a pose's time PRECEDES it)
#
# Both built from source; renders are `screen render --all --build N --primitives`.
#
# CONTROL 1 -- the two binaries really do embody the two eras:
# stale rest (0,0) t=70 [12:0,0 70:0,0 80:0,0 -:0,0]
# fixed rest (0,0) t=12 [0:0,0 12:0,0 70:0,0 80:0,0] (build 5, pteff00.prm)
# CONTROL 2 -- the renderer is deterministic: same binary, same flags, twice,
# entry 7 -> 0 differing px, entry 12 -> 0 differing px.
entry what differing px RMSE max|d|
0 loading 0 0.000 0
1 loading 0 0.000 0
2 plate 0 0.000 0
3 plate 0 0.000 0
4 title 0 0.000 0
5 main_menu 0 0.000 0
6 extras 0 0.000 0
7 title_jp 74507 12.409 233 <-- DIFFERS
8 main_menu_jp 0 0.000 0
9 extras_jp 0 0.000 0
10 splash publisher 32842 1.767 35 <-- DIFFERS
11 splash developer 23201 0.942 31 <-- DIFFERS
12 loading (dressed) 49771 10.078 229 <-- DIFFERS
13 splash publisher twin 31708 1.782 35 <-- DIFFERS
14 splash developer twin 23201 0.942 31 <-- DIFFERS
15 loading twin 49771 10.078 229 <-- DIFFERS
7 of 16 bundles differ between the eras; 16-7 are byte-identical.
# MECHANISM, entry 7 (title_jp): exactly ONE element's rest POSITION moves.
# stale 8 ptlogo_eff3.t32 ... rest (108,72)
# fixed 8 ptlogo_eff3.t32 ... rest (98,42)
# ptlogo_eff3.t32 is the element MISSION.md and ui-resting-pose.md already
# name as THE plateau-less rest() discriminator. 74 507 px, RMSE 12.4.
# MECHANISM, entries 10-15: NO rest position changes at all. The rest
# SELECTION moves to a different keyframe which happens to sit at the same
# (x,y) with a different SCALE and ALPHA -- e.g. pgloading_delta.t32 holds
# (120,560) at 0%,0% a=0 / 75%,75% a=128 / 96%,96% a=192. Comparing the
# 'rest (x,y)' column alone says nothing changed; the pixels say otherwise.

53
docs/re/main-is-the-stale-era.md
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@@ -55,10 +55,57 @@ which is easy to read as *"I am current"* when it means *"main has nothing"*.
fix moves **times**, not pixels. Same signature as the `.tbm` finding and the
stale-`sylpheed-cli` finding.
## 🔴 The eras DO change pixels — on 7 of 16 bundles
**Done 2026-08-30**, after being deferred twice.
[`data/decoder-eras-all-16-builds.txt`](data/decoder-eras-all-16-builds.txt).
Both eras built from source and every composable `GP_TITLE` bundle rendered
through each.
| entry | what | differing px | RMSE |
|---|---|---|---|
| 0–6, 8, 9 | loading, plate, **title**, **main_menu**, **extras**, the JP menu pair | **0** | 0.000 |
| **7** | **`title_jp`** | **74 507** | **12.409** |
| 10, 13 | publisher splash + twin | ~32 000 | 1.77 |
| 11, 14 | developer splash + twin | 23 201 | 0.942 |
| 12, 15 | dressed loading + twin | 49 771 | 10.078 |
⚠️ **`sylpheed-port` tested `title`, `main_menu` and `title_jp` and found 0
differing pixels.** Two of those three (4 and 5) are in the identical nine, so
their result is reproduced. **`title_jp` is not** — I measure 74 507 pixels and
RMSE 12.4 under `screen render --all --build 7 --primitives`. That is a real
disagreement, not a rounding one, and it matters because `title_jp` is one of the
two rows their `check-all` now allows **by name**. Either the render flags differ
or one of the two binaries was not what it was believed to be — the second is a
trap this corpus has hit three times. It is theirs to check; I am recording the
number and the flags, not adjudicating their tree.
**Controls, both run before believing any of it:**
* the two binaries genuinely embody the two eras — build 5's `pteff00.prm` reads
`rest t=70 [12 70 80 -]` stale against `rest t=12 [0 12 70 80]` fixed;
* the renderer is **deterministic** — same binary, same flags, twice, 0 differing
pixels on entries 7 and 12. Without that, every number above is noise.
### The mechanism, and a trap inside it
On **entry 7** exactly one element moves: `ptlogo_eff3.t32`, rest `(108,72)` →
`(98,42)`. That is the element [`MISSION.md`](../port/MISSION.md) and
[`ui-resting-pose.md`](structures/ui-resting-pose.md) already name as **the**
plateau-less `rest()` discriminator — so the era difference on the JP title is
precisely the open question, not a second unrelated one.
⚠️ On **entries 10–15 no rest position changes at all**, yet they differ by up to
49 771 pixels. The rest *selection* moves to a different keyframe that sits at the
**same (x,y) with a different scale and alpha** — `pgloading_delta.t32` holds
`(120,560)` at `0%,0% a=0`, `75%,75% a=128`, `96%,96% a=192`. **Comparing the
`rest (x,y)` column says nothing changed.** My first extraction did exactly that
and would have reported a difference with no cause. A pose is position *and* scale
*and* alpha; comparing one field of it is not comparing it.
## What this does not settle
* **Whether the two eras render identically beyond three screens.** I set out to
test that disc-wide and stopped when the ref check turned up something larger; a
build-and-compare across all 12 `GP_TITLE` builds is still not done.
* **Why the `title_jp` measurement disagrees with the port's.** Recorded above with
the exact flags; not chased into their tree.
* **Why 171 commits are unmerged**, and whether that is deliberate. Merging is a
human's call — this page only records that the state exists and what it costs.