ddidderr
9e74745fde
Document the Wine-backed original start and charged-launch captures, the matching deterministic Rust states, and the remaining boundary that a chosen claw terminal was not forced in the live original. Test Plan: - Launch original/TDKPIN.EXE with Wine 11.15 staging - Send keypad plus, hold Down for 1.1 seconds, release, and inspect captures - Compare original started state with Rust launcher step zero - git diff --cached --check
81 lines
6.1 KiB
Markdown
81 lines
6.1 KiB
Markdown
# Reconstruction ledger
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## Source artifacts
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The reconstruction was derived from the preserved files under `../original/`.
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The primary program fingerprint is:
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```text
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a9022f1894e3e6e21fc42e8f6c932f7c549ca77f63aaa0c488bb9d55d9d0174c TDKPIN.EXE
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f1d9ac980c7bfba5dc53eaa9e7cb2c3cd9b82f879ee8962ad40bf863d641bb49 MMTIMER.DLL
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```
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The Ghidra recovery covers all 301 named NE exports plus 62 internal function
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entries. Its raw output and coverage tables remain beside the binary, so later
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work can be checked against the same evidence rather than against this Rust
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implementation.
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## Coverage by subsystem
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| Subsystem | Rust status | Evidence and boundary |
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| --- | --- | --- |
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| Artwork | Exact | All 34 custom DIB images, three standard bitmaps, icon, and palette derivatives are preserved in `assets/original/`. The game uses the original 640x460 table, loading, help, ball, wheel, robot, plunger, media, and diamond frames. |
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| Audio | Exact samples | All 16 mono PCM WAV resources are embedded unchanged. Their trigger roles were recovered from resource use and gameplay context. |
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| Help and languages | Exact | Original resource images 1001-1005 are displayed directly. |
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| Playfield collision layout | Recovered | All 109 active type-2 line objects and 40 static active type-1 circles are transcribed from the original 175-object registration table. The registration routine converts its sideways inputs with `screen = (y, x - 20)` and accumulates explicitly relative objects. Its circle sizes are complete center-contact extents, so the rendered ball radius is not added a second time. Object 174 is omitted because the original overwrites it with the live ball every frame. Moving flippers use equivalent native Rust bodies. |
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| Ball launcher | Recovered | The initial 32-bit fixed-point coordinates decode to `(325, 413)` in the right shooter lane. Scan code `0x50` compresses the eleven frames in resource 901 while Down is held; the key-release routine activates the ball with the accumulated vertical launch velocity. |
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| Physics arithmetic | Reimplemented | The Win16 fixed-point/timer engine is replaced by deterministic fixed-step floating-point integration. Restitution and impulses are tuned to the recovered table but are not instruction-for-instruction equivalents. |
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| Rules | Partly recovered | Player count, controls, wheel holes, magnetic saves, four-position ball lock, target banks, increasing bumper value, nine-part TDK diamond, permanent double scoring for a completed diamond, KByte media progression, and media extra balls follow the original help and code paths. The claw state machine has now been recovered in readable form, but its raw release-coordinate projection is still being decoded before the Rust behavior can claim parity. |
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| Numeric scoring | Partly inferred | Visible 2000-6000 target values and recovered registration values are preserved. Some bumper, bank-completion, robot, wheel, lock, and media thresholds are best-evidence reconstructions because the decompiler did not recover meaningful names or a clean rule table. |
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| High scores | Compatible import | The original 276-byte table is decoded as ten `IWIK`-XOR-obfuscated little-endian scores plus ten 22-byte names, sorted, then migrated to portable JSON. |
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| Configuration | Behaviorally compatible | Sound, language, and five detail levels are retained. Storage moves from a local Win16 INI file to the platform user-data directory. |
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| Windows UI shell | Deliberately modernized | Win16 menus, modal dialogs, GDI blitting, and multimedia timers are replaced by an aspect-correct 960x690 native window with keyboard overlays. The visible game and original help remain at 640x460 logical pixels. |
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## Extracted asset inventory
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`assets/original/` contains 69 files used or preserved by the modern project:
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- 40 image files, including all gameplay frames and five localized help pages;
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- 16 original WAV resources;
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- six decoded dialog descriptions;
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- the original icon in ICO and PNG form;
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- palette and version metadata;
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- the original high-score table and INI configuration sample.
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The parent `original/assets/` directory remains the lossless extraction record,
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including raw resource blobs and the extraction manifest. The Rust copy is the
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decoded, build-ready subset; it does not replace that evidence archive.
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## Validation levels
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- Static coverage: all intended decoded visual/audio resources are preserved;
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the recovered static collision layout is represented in Rust.
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- Build coverage: `cargo check`, unit tests, and strict Clippy complete on the
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host. Cross-target checks pass for `x86_64-pc-windows-gnu` and
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`x86_64-apple-darwin`; CI is configured to build and test natively on Linux,
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macOS, and Windows.
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- Runtime coverage: the Linux executable was launched through the real window
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backend, the attract screen was inspected, a game was started, a ball was
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launched, collision scoring was observed, and a rendered frame was captured.
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- Original-runtime comparison: Wine 11.15 staging ran the preserved Win16 NE
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executable; keypad `+`, a 1.1-second Down hold, release, and the resulting
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launch were captured and compared with deterministic Rust states. A chosen
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original claw terminal was not forced live, so claw evidence is static code,
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decoded numeric constants, original assets, and Rust state/frame traces.
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- Deterministic mechanics coverage: named launcher, flipper, and all four claw
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terminal scenarios advance at exact 120 Hz steps, record JSON state/event
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traces, and can export the logical 640x460 render target at any requested
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step for visual inspection.
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- Semantic boundary: no claim is made that every trajectory or score tick is
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bit-identical to the 16-bit executable. Remaining numeric inference is listed
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above instead of being presented as proven parity.
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## Architecture
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- `app.rs`: screen flow, controls, rendering, audio dispatch, and overlays;
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- `assets.rs`: compile-time original asset embedding;
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- `game.rs`: fixed-step game state, recovered walls, rules, and scoring;
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- `geometry.rs`: segment/circle collision primitives;
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- `table.rs`: source-traceable collision objects recovered from the Win16 table;
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- `persistence.rs`: platform paths, settings, high scores, and legacy import.
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