# source410 — literal reconstruction of the missing BT 4.10 game source

**Everything in this directory is RECONSTRUCTED, not recovered.** The authentic surviving
source lives in `CODE/` and is never mixed with this tree. The goal here is an
archival-grade recreation of the `d:\tesla_bt\` translation units that exist only inside
`BTL4OPT.EXE` (the shipped 4.10 binary), written in the 1995 VWE house style against the
1995 MUNGA/MUNGA_L4 engine headers that DID survive.

## Ground rules
1. **Never copy a reconstructed file into `CODE/`** — the assembled buildable tree
   (originals + reconstructions) is produced by a script into a build directory, so
   provenance stays unambiguous file-by-file.
2. **Every `.CPP` here has a `.NOTES.md` sidecar** carrying the evidence: the binary
   address map, decomp references, which sibling sources supplied each idiom, and every
   judgment call with its tier ([T1] decomp-proven … [T4] style guess). The `.CPP` itself
   stays clean 1995 style — no modern annotations inside.
3. **Assert line numbers are constraints.** The binary's `Fail()` sites record the original
   file+line (`BTL4APP.CPP:400` etc.); reconstructed files are shaped so those calls land on
   their recorded lines. A file that can't meet its line constraints yet says so in the
   sidecar.
4. **Layout mirrors the original tree**: `BT/` (bt.lib, 36 TUs) and `BT_L4/` (btl4.lib,
   13 TUs + BTL4.CPP), matching the surviving `BT.MAK`/`BTL4.MAK`.

## What drives the work
- The per-TU manifest: `C:\VWE\BT411\reference\BT410_SOURCE_MANIFEST.md`
  (tool `tools/manifest410.py`; method log `phases/phase-03-bt410-source-manifest.md`).
- The decomp: `C:\VWE\BT411\reference\decomp\all\part_*.c` (+ `section_dump.txt` strings).
- The port's semantic reconstructions: `C:\VWE\BT411\game\reconstructed\` (WinTesla-hosted;
  each literal file here re-hosts one back onto the 1995 engine APIs).
- Style/idiom exemplars: surviving `CODE/BT/*.CPP`, `CODE/RP/RP_L4/*.CPP`,
  `CODE/RP/MUNGA*/**` (the 1995 engine source itself).

## Status (2026-07-19)
**Compile verification is LIVE: `./compile410.sh --sweep`** (BC4.52 + the authentic OPT.MAK
flags; the period compiler is the reviewer). `backdate.py` mechanizes WinTesla→1995 header
back-dating (donors: `C:\VWE\BT412\engine\MUNGA\*.h`).

| item | state |
|---|---|
| **THE WHOLE TREE COMPILES (2026-07-19)** | ✅ **11/11: all 10 surviving originals + the BTL4APP.CPP pilot build clean under BC4.52 + authentic OPT flags** (`./compile410.sh --sweep`) |
| BT/BTCNSL.HPP + BT/BTSCNRL.HPP | ✅ reconstructed — **console wire IDs recovered from the binary** (Killed=9, Damaged=10, ScoreUpdate=13, DeathWithoutHonor=15 [T1]; TeamScore=12 [T4 GUESS — verify]); see BTCNSL.NOTES.md |
| BT_L4/BTL4APP.CPP (pilot reconstruction) | ✅ compiles (18.5KB obj); 12/12 functions, Fail() at recorded line 400 |
| Staged header family (13: mech/mechsub/heat/powersub/mechweap/emitter/mechmppr/btplayer/projtile/missile + btl4mppr/btl4vid) | ✅ [T3] interface-proven by every surviving consumer; layouts parked in reserved[] blocks — see STAGED-HEADERS.NOTES.md + MECH-LAYOUT.md |
| MUNGA backfills (VDATA, ROTATION, VECTOR2D, AUDREND, APP, LAMP, GAUGREND, GAUGE) | ✅ compile-proven (BACKFILLS.NOTES.md) |

**Next work package — the mech-family, REVISED (round-3 finding, 2026-07-19):** the plan to
"reconstruct mech.hpp first" was the wrong order. A full read of the port's mech.hpp shows
it is a hybrid (1995 skeleton + Recon proxies + port-only members + relocated fields), and
substantial regions of the binary's 0x854-byte Mech object remain UNMAPPED — the port
declares "the remaining members up to sizeof==0x854" in its mech2-4 slices. A literal
MECH.HPP that precedes those TU reconstructions would be fiction. Corrected order:
1. **MECH.HPP is the CAPSTONE, grown incrementally** with each mech-family TU
   reconstruction (mech.cpp → mech2-4 → subsystem TUs), starting as an interface +
   known-ordered members with explicit `reserved[]` filler for unmapped regions
   (sidecar-tracked), tightened as each TU pins its slice.
2. The dependent headers (`mechsub`, `mechmppr`, `btl4mppr`, `emitter`+`mechweap`,
   `btplayer`, `projtile`, `missile`) ship WITH their TUs against the staged MECH.HPP.
3. The blocked originals (BTTOOL, GAUSS, PPC, BTREG) and the BTL4APP pilot compile
   green as those land — BTREG last (it includes the whole game-header world).
Offset oracles for every stage: BT411 CLASSMAP.md, decomp-reference.md §3, and the port
headers' static_assert-locked members.

## Toolchain — IN HAND (2026-07-19)
**Borland C++ 4.52**, archived at `../../BORLAND/BC45/`, chosen by byte-match: the fleet's own
`CODE/RP/CW32.LIB` is identical to 4.52's (and not 4.5's). BCC32/TLINK32/TLIB/MAKE run natively
on Win11. The shipped `BTL4OPT.EXE` recipe is `CODE/BT/OPT.MAK` (plain `bcc32`,
`-DLBE4;DEBUG_LEVEL=0;DEBUG_STREAM=cout`, `-5 -a4 -ff -k- -V -Jg -x- -RT-` + the full `-O` set,
PCH `btopt.csm`; link `-Tpe -ax` with `c0x32.obj + dpmi32.lib + cw32.lib` = Borland PowerPack
DPMI32, not Phar Lap TNT). Compile verification of reconstructed TUs is therefore possible
file-by-file; the current blocker for full closure is the 1995 engine header gap (`vdata.hpp`
first — only the drifted WinTesla `VDATA.h` survives, in BT412/engine). Include order for
builds: `CODE/BT/*` over `CODE/RP/*`, `-DNO_PRECOMPILED_HEADERS` until the mech-family headers
are reconstructed. Remaining gap: TASM32 (JOYSTICK.ASM only).

## Link campaign (build410, 2026-07-19)
`source410/build410.sh` assembles BTL4OPT.EXE: merged-engine mass compile (**152/152 green**
— the ENTIRE surviving engine compiles), BT TUs (11/11), tlib libs (munga 1.25MB / mungal4
with the prebuilt-1995 objs / bt / btl4), then the authentic tlink32 link rooted by a probe
main (build scaffold). First true link run: **52 unresolved externals**
(`UNRESOLVED-LEDGER.txt`) = the measured remaining gap. Kill-lists: l4gauge.cpp back-date
(14 widget statics), the missing-engine-body back-date wave (~24: rotation, player, team,
l4app, explode, dropzone, terrain, cultural, subsystm-statics, netclient...), the prebuilt
RANDOM.obj fold, and the staged game-TU statics blocks (MECH.CPP et al. — each TU file opens
with its binary-evidenced Derivation/SharedData statics and grows into the full body).
Link-lib arbitration: SOS = SOSDBXC+SOSMBXC (the 32-bit Borland-flat variants; SOSMW*=16-bit),
WATTCP excluded (it belongs to the 16-bit NetNub TSR — the game talks to it via shared
memory), filestrm = the RP-era pair (BT-tree pair is post-4.10 drift; override layer).