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From-scratch reimplementation of the Sword of the Stars (2006) engine. Clean-room; engine code only — bring your own game copy. Planning/RE evidence live in sots-re.
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alex 165478592a shim: fix cbpin's wrapped header and six unnamed hooks; add a config check 
Lane BP found both defects while copying cbpin for a determinism probe, and its own
first draft reproduced the comment wrap -- which is what a trap looks like. The
header ran on past the comment and left a stray aiseed.values ahead of the real one,
and six registered hooks went unnamed, so under hooks=trace the config ran six more
detours than it claimed.

The check enforces the two syntax defects everywhere and exhaustiveness only where a
template opts in with '# exhaustive'. hooks=trace legitimately means 'trace all but
these', so a global exhaustiveness rule would be a rule about a style nobody agreed
to; it matters only for a minimal-hook determinism probe.
2026-09-09 02:01:58 -04:00
cmake m0: binkw32 proxy shim, minhook, trace hook on Application::Initialize; build/deploy tooling 2026-09-07 17:22:15 -04:00
docs rng: model chance(), the only entry point that can cost zero words 2026-09-08 22:32:14 -04:00
include/generated regenerate addresses header: lane AG's gate-indexed audit fragment (1269 entries) 2026-09-08 22:29:08 -04:00
src shim: fix cbpin's wrapped header and six unnamed hooks; add a config check 2026-09-09 02:01:58 -04:00
tests rng: model chance(), the only entry point that can cost zero words 2026-09-08 22:32:14 -04:00
third_party mars/vfs: gob ZIP reader + native override, miniz 3.1.2; oracle-verified 8352+2035 entries 2026-09-07 17:40:51 -04:00
tools shim: fix cbpin's wrapped header and six unnamed hooks; add a config check 2026-09-09 02:01:58 -04:00
.gitignore init commit 2026-09-07 17:07:54 -04:00
CMakeLists.txt PAR: roll parity -- the AI's per-turn RNG word count is NOT fixed, at any scope 2026-09-08 19:32:19 -04:00
CMakePresets.json m0: binkw32 proxy shim, minhook, trace hook on Application::Initialize; build/deploy tooling 2026-09-07 17:22:15 -04:00
CONTRIBUTING.md CONTRIBUTING: note uv tool install cmake as the local workaround 2026-09-08 09:07:47 -04:00
LICENSE init commit 2026-09-07 17:07:54 -04:00
README.md src/app: the standalone -- load a save, run a turn, write a save 2026-09-08 10:35:45 -04:00

README.md

sots-engine

A from-scratch, functional reimplementation of the engine behind Sword of the Stars (2006). Not a byte-for-byte decompilation: behavior-equivalent code, built up one verified piece at a time (OpenRCT2-style) until the tree can build the whole application on its own.

Bring your own game. This repository contains engine code only. Game data, assets, saves, and the original binaries are never included; tests and tools read an owner-supplied copy via $SOTS_DATA_DIR. See CONTRIBUTING.md for the clean-room rules.

Status

Phase 2. M0 done — the shim frontend (src/shim/, a proxy binkw32.dll the original game loads) builds, deploys, hooks, and logs from a real game launch. Engine code accrues under src/mars/ and src/game/; each module is oracle-verified against the owner's game data before merge:

  • mars/parse — brace-block + .effect readers (1,531/1,531 files agree with the reference)
  • mars/text — flat key/value tables, id manifests, CSV (64/64 files agree)
  • game/sim — strategic formulas (economy, research, colonies, movement) as pure functions; 356 hand-computed checks
  • mars/vfs — .gob (ZIP) archive reader + loose-file override; entry counts and bytes verified against unzip
  • mars/stream — the game's self-describing save/serialization format (reader, writer, typed shapes) + gzip; three real saves round-trip byte-identical
  • mars/rng — MT19937 with save-state load/store; layout confirmed against real saves, draw mappings read off the binary (docs/mars-rng.md)
  • game/data — typed catalogs (weapons, ship sections, turrets, id registries, tech tree, strings) with cross-reference checks; 229k values agree with the reference
  • game/design — ship-design assembly/fit/tech-gating rules and derived stats; validates all 127 stock designs from real saves
  • app — the standalone: sots_turn loads a save, runs one strategic turn over the published phase order of all three turn drivers, and writes a save. 14 of the 44 turn-driver phases are modelled; every phase that is not appears in the run log as a named no-op. How far it is from the byte-match, and what stands in the way, is in docs/S-standalone.md

Build: cmake --preset host && cmake --build --preset host && ctest --preset host (Linux); tools/sync-build.sh cross-builds the shim on the lab box and stages it for deployment.

Layout (grows with the work)

  • src/shim/ — binkw32 proxy + hooks + old-vs-new compare harness (frontend #1)
  • src/mars/, src/game/ — the engine and game reimplementation (accruing)
  • src/app/ — the standalone turn driver (frontend #2): load a save, run a turn, write a save
  • include/generated/sots_addresses.h — binary facts (RVAs/prototypes), generated from the RE repo
  • tests/ — host tests; real-data tests skip unless $SOTS_DATA_DIR is set
  • tools/ — build (MinGW i686 cross) and deploy scripts

Planning, findings, and verification evidence are tracked in the private RE repo (sots-re).