mirror of
https://github.com/HarbourMasters/Shipwright
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briaguya
9c29824f38
Unblocks the rest of the migration. soh.o2r is produced by ZAPD via OTRExporter/extract_assets.py, both of which this migration deletes; its replacement is a small in-tree packer that has to reproduce ZAPD's texture quantisation exactly. Rather than block Phases 2/3/5 on that packer, check the archive in and make GenerateSohOtr a copy. The archive doubles as Phase 4's acceptance oracle -- the packer is correct when its output matches this entry-for-entry -- which is strictly more useful than Gate E's planned manifest of hashes of it. Generation turns out to be content-deterministic but NOT byte- deterministic: two runs give identical payloads for all 1,042 entries but different file hashes, because zip stores per-entry timestamps. So the Phase 4 comparison must be entry-wise; whole-file would fail even on a correct archive. Recorded in prebuilt/README.md. Adds a configure-time guard on the baked-in portVersion. OTRGlobals.cpp :283 requires exact major.minor.patch equality and RunExtract exit(1)s with "soh.o2r is outdated", which is an opaque symptom for a stale checked-in file; verified the guard fires by building against 9.2.4. ExtractAssets, CI and copy-existing-otrs.cmake are deliberately untouched -- ExtractAssets still generates a correct archive while ZAPD exists, and the CI job keeps working since it just builds this target.
88 lines
4.2 KiB
Markdown
88 lines
4.2 KiB
Markdown
# Prebuilt `soh.o2r` — **temporary**
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This directory exists to unblock the Torch migration and is **meant to be deleted**.
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`soh.o2r` is the port's own asset archive: fonts, textures, presets, translations, shaders —
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everything under `soh/assets/custom/`, plus a `portVersion` stamp. It is built by
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`GenerateSohOtr`, which today drives ZAPD through `OTRExporter/extract_assets.py`. The migration
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deletes ZAPDTR and OTRExporter, so that producer goes away and its replacement — a small in-tree
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packer (Phase 4 of `torch-migration/PLAN.md`) — has to reproduce it byte-for-byte, including
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ZAPD's specific texture quantisation.
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Rather than block every other phase on that packer, the archive is checked in here and
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`GenerateSohOtr` just copies it into place. **Phases 2, 3 and 5 become testable without the
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packer existing.**
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This file also serves as Phase 4's acceptance oracle: the packer is correct when its output
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matches this archive entry-for-entry. That replaces Gate E's planned sha256 manifest — the
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artifact is strictly more useful than a list of hashes of it.
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## Provenance
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| Generated | 2026-07-25 |
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| Shipwright branch | `torch-migration` @ `fe2f52248` |
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| `develop` at the time | `c4e92a70f` (inputs verified identical — `git diff develop HEAD -- soh/assets/custom libultraship CMakeLists.txt` was empty) |
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| libultraship submodule | `c57da1b4` |
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| `CMAKE_PROJECT_VERSION` | `9.2.3` |
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| Producer | `cmake --build build --target GenerateSohOtr` (ZAPD `botr -se OTR --norom`) |
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| Size / entries | 4,414,957 bytes / 1,042 entries (1,038 checked-in assets + 3 LUS shaders + `portVersion`) |
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| sha256 | `1d23b582fbc29cebf803b6ee54856089d0978e5496e6d4b1dbcde876e13cf13c` |
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| sha256 of inputs | `de8ba0b5167bec6956258dd0445d01ac0f6daac84aff091c678d951cc72598f6` |
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The input hash covers every file under `soh/assets/custom/` except `shaders/`, which is not
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checked in — it is copied out of `libultraship/src/fast/shaders/` at generation time. Recompute it
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with:
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```sh
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find soh/assets/custom -type f -not -path '*/shaders/*' -print0 | sort -z \
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| xargs -0 sha256sum | sha256sum
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```
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(`-print0`/`sort -z` are required: several preset filenames contain spaces.)
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## Generation is content-deterministic, not byte-deterministic
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Two consecutive runs produce archives with **identical payloads for all 1,042 entries** but
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**different whole-file hashes** — the zip stores a modification timestamp per entry. So:
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- The sha256 above identifies *this* file, not "any correct archive".
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- **Phase 4's acceptance test must compare entry-by-entry**, never whole-file. A byte-identical
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archive is not achievable and not the goal.
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## What this pins
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The archive freezes three inputs. If any changes while this workaround is in place, the checked-in
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copy is stale and **nothing will tell you at runtime** except missing or wrong assets:
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1. **`soh/assets/custom/`** — edit an asset and your change is silently ignored. Compare the input
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hash above.
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2. **libultraship's shaders** — `libultraship/src/fast/shaders/` is copied in at generation time,
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so a LUS submodule bump can drift the three shaders inside this archive.
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3. **The project version.** `portVersion` here is `9.2.3`. `OTRGlobals.cpp:283` requires exact
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`major.minor.patch` equality against the build's version, and `RunExtract` calls `exit(1)` with
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"soh.o2r is outdated" if it fails. A configure-time check in the root `CMakeLists.txt` catches
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this and tells you to regenerate, because the runtime symptom is not obvious.
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## Regenerating
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From a tree where ZAPDTR/OTRExporter still build (i.e. `develop`):
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```sh
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cmake --build build --target GenerateSohOtr
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cp soh.o2r prebuilt/soh.o2r
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```
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Then update the provenance table above.
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## Removing this
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When Phase 4's packer lands and its output matches this archive entry-for-entry, delete this
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directory, drop the `!prebuilt/soh.o2r` negation from `.gitignore`, and restore `GenerateSohOtr`
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to a real build step (including the libultraship shader copy, which the copy-only version skips).
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**Delete it before the migration PR merges** if at all possible. It is a 4.4 MB binary, and a blob
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that reaches `develop` is in the history permanently; removed in the final tree and squash-merged,
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it never lands there at all.
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