6263686841
The publisher shape check covered one element on one screen, which I flagged: a port applying one screen-wide ramp to everything would have passed it. developer_logos declares gamearts/seta flat across 15..30 and anima decaying 17% over the same interval. Same screen, same frames, same clock -- the two flat elements are the control for the third, and any phase or rate error hits all three alike. Pre-registered, then filmed. Flat ones flat to five decimals (+0.00000), anima decays. Fitted scale-free against declared curves: each element matches its own at 0.49/0.50/2.18% max error and the OTHER shape at 8.1-8.8% -- 4-17x, both directions. Establishes the ramp is per-element, not just correctly shaped.
161 lines
6.5 KiB
Markdown
161 lines
6.5 KiB
Markdown
# The splash: frozen, then fixed, and now checked for SHAPE as well as motion
|
||
|
||
**Status:** ✅ **animates, and the ramp matches the declared curve.** Written
|
||
2026-09-02 by the Port; HANDOFF on this branch answers `9ca1eb5`.
|
||
|
||
The 2026-09-02 play-test found the splash frozen. The cause and the fix are in
|
||
the commit history; this page is the part that comes after — **is the animation
|
||
now the right animation?** `motion-census` says explicitly that it cannot answer
|
||
that: *"a wrong ramp that moves every frame passes here."*
|
||
|
||
## Pre-registered (R2)
|
||
|
||
`palogo_sqex_eff` declares `0:a=0 → 15:a=255 → 30:a=212 → 45:a=0` — three
|
||
segments, three gradients:
|
||
|
||
| segment | declared |
|
||
|---|---|
|
||
| 0 → 15 | **+17.0** per unit |
|
||
| 15 → 30 | **−2.87** per unit |
|
||
| 30 → 45 | **−14.13** per unit |
|
||
|
||
> So a film should show three straight runs with breakpoints at **15** and
|
||
> **30**, the middle slope about **1/5** the magnitude of the last, and the rise
|
||
> about **1.2×** the last.
|
||
|
||
## Measured, from a film of a real boot
|
||
|
||
Region: `686x11+299+319` — the companion's top strip, which **no other element
|
||
overlaps**, so the number is that element's own alpha and not a composite.
|
||
|
||
| view units | strip mean | slope/unit |
|
||
|---|---|---|
|
||
| 5.58 | 0.02809 | |
|
||
| 10.00 | 0.05086 | **+0.00515** |
|
||
| 13.04 | 0.06611 | **+0.00503** |
|
||
| 16.12 | 0.07530 | +0.00298 ← crossing the breakpoint |
|
||
| 19.21 | 0.07260 | **−0.00087** |
|
||
| 25.38 | 0.06695 | **−0.00092** |
|
||
| 28.39 | 0.06482 | −0.00071 |
|
||
| 31.39 | 0.05719 | −0.00254 ← crossing the breakpoint |
|
||
| 34.39 | 0.04471 | **−0.00416** |
|
||
| 40.39 | 0.01910 | **−0.00428** |
|
||
| 43.39 | 0.00655 | −0.00418 |
|
||
| 46.39 | 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 | declared | measured |
|
||
|---|---|---|
|
||
| middle : last | 0.203 | **0.213** |
|
||
| rise : last | 1.20 | **1.20** |
|
||
|
||
Within 5 % and exact respectively. **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 whatever the sprite's own pixels are; its absolute value carries the
|
||
texture. A ratio between segments divides that out, which is why the shape is
|
||
checkable from a composite at all. Anyone quoting 0.00515 as an alpha is
|
||
misreading it.
|
||
|
||
## What this still does not establish
|
||
|
||
* That it **looks** right. Three instruments have now agreed with a picture a
|
||
human called wrong, and the fourth agreeing does not change the standing of
|
||
the fifth. A play-test is the check.
|
||
* ~~Anything about the **developer** splash's three logo/companion pairs. One
|
||
element, one screen.~~ ✅ **Closed below, and the developer splash turned out to
|
||
be the far better test.**
|
||
* The **absolute** alpha. The shape matches; whether the port's alpha equals the
|
||
game's at a given unit is `verify-capture`'s question, and it answers 0.01 %
|
||
at the settled pose only.
|
||
|
||
|
||
---
|
||
|
||
# ✅ The developer splash: three elements, TWO declared shapes, on one screen
|
||
|
||
The publisher check above had a structural weakness I named at the time: one
|
||
element, one screen, one shape. If the port applied *some* single ramp to
|
||
everything, that check would pass.
|
||
|
||
**The developer splash cannot be fooled that way, because it declares two
|
||
different shapes at once:**
|
||
|
||
| element | declared alpha | middle segment |
|
||
|---|---|---|
|
||
| `palogo_gamearts_eff` | `0:0 15:255 30:255 45:0` | **flat** |
|
||
| `palogo_seta_eff` | `0:0 15:255 30:255 45:0` | **flat** |
|
||
| `palogo_anima_eff` | `0:0 15:255 30:212 45:0` | **decays 17 %** |
|
||
|
||
Same screen, same frames, same clock, same code path. The two flat elements are
|
||
the control for the one that is not — no second run, no second renderer, and
|
||
nothing for a phase or rate error to hide behind, because any such error hits all
|
||
three identically.
|
||
|
||
## Pre-registered, before the film was read
|
||
|
||
> In units 15→30, `gamearts` and `seta` hold flat while `anima` falls gently.
|
||
> All three fall steeply 30→45.
|
||
|
||
## Measured, off a real filmed boot
|
||
|
||
Companion-only strips (each companion's rectangle minus the logo sitting inside
|
||
it), mean luma, `--film-interval=0.03`:
|
||
|
||
```
|
||
segment units 16-29 units 31-44
|
||
gamearts +0.00000 -0.00101
|
||
seta +0.00000 -0.00151
|
||
anima -0.00001 -0.00003
|
||
```
|
||
|
||
**The two flat ones are flat to five decimals. The decaying one decays.** And all
|
||
three fall over 31–44, so the flatness is not a dead element.
|
||
|
||
## The quantitative version, and the falsification arm
|
||
|
||
Each trace normalised by a **single solved gain** — one scalar per element, not a
|
||
per-point fit — against the declared curve, over the whole `t=0..45` ramp:
|
||
|
||
| element | fitted against | max err | rms err |
|
||
|---|---|---|---|
|
||
| `gamearts` | **its own (flat)** | **0.49 %** | 0.23 % |
|
||
| `seta` | **its own (flat)** | **0.50 %** | 0.27 % |
|
||
| `anima` | **its own (decay)** | **2.18 %** | 1.19 % |
|
||
| `gamearts` | anima's decay | 8.32 % | 4.80 % |
|
||
| `seta` | anima's decay | 8.08 % | 4.86 % |
|
||
| `anima` | flat | 8.82 % | 4.94 % |
|
||
|
||
**Both directions.** Every element fits its own declared shape 4–17× better than
|
||
it fits the other one available on the same screen. A port that drew one ramp for
|
||
all three would sit at ~8 % on at least one row; none does.
|
||
|
||
`anima`'s 2.18 % is the loosest row and the reason is its signal: its
|
||
companion-only strip means ~0.0005 against gamearts's ~0.015, thirty times
|
||
dimmer, so its noise floor is thirty times higher in these units. It still
|
||
separates from the wrong curve by 4×.
|
||
|
||
## What this adds over the publisher check
|
||
|
||
The publisher check established that the ramp has the declared *breakpoints and
|
||
slope ratios*. This establishes that the ramp is **per-element** — that the port
|
||
reads each element's own keyframes rather than applying a screen-wide curve. That
|
||
is a different failure mode, and it is the one that would have survived the
|
||
publisher check unnoticed.
|
||
|
||
## What it still does not establish
|
||
|
||
* That it **looks** right. This is instrument five. The standing of a human's
|
||
eyes is unchanged by it.
|
||
* The **absolute** alpha, for the same reason as above — a solved gain is
|
||
deliberately scale-free, so this is a shape result and says nothing about
|
||
whether the port's alpha equals the game's at a given unit.
|
||
* Anything about the **logo** elements. Both checks measure the pre-blurred
|
||
*companions*, because those are the strips that can be isolated from the sharp
|
||
logo underneath them.
|