Joe DiPrimaandClaude Fable 5
a5fb96ae96
The whole critical-hit pipeline was dark, three layers deep, and one of those
layers had fooled us into a false conclusion about the 1995 binary itself.
LAYER 1 -- the trigger, recovered from the un-exported gap. The Mech MESSAGE
TABLE at 0x50bdf8 ({id, name, handler} rows) names the real
Mech::TakeDamageMessageHandler at 0x4a0230 -- message 0x12 "TakeDamage" --
plus seven sibling handlers (PlayerLink, RealMaxSpeed, BalanceCoolant,
Set/ClearBurningState, EjectPilot, DuckRequest). Inside it, the crit chance
at 0x4a0164: p = clamp(0.7 * damageLevel^2 + 0.01, 0..1), gated on the
player's simLive flag (+0x25c -- novice never crits), rolled PER BURST on the
current zone, skipping a zone already burning. Chance is ~1% on fresh armour,
~18% at half-stripped, ~58% at 90% -- crits arrive exactly as armour fails.
The handler's application loop replaces the engine base's single call, which
ignored burstCount entirely (multi-burst damage under-applied (burst-1)x).
Faithful shape: per burst, crit-roll -> CriticalHit @0049ccc4 (which routes
half the amount through the armour internally and picks ONE critical
subsystem by criticalWeight) else zone->TakeDamage -- then RE-RUN the
cylinder lottery from the impact point for the next burst, stopping early
once the mech is disabled. Multi-burst damage sprays across zones by design.
LAYER 2 -- the sink. MechSubsystem::TakeDamage was an empty btstubs stand-in;
the real body is at 0x4ac0bc (CLASSMAP had that address mislabeled
"HandleMessage"): zone damage, then on level >= 1.0 the Destroyed alarm, the
PrintState gate, the 1.0 pin, and -- for a vital subsystem -- the owner
mech's graphicAlarm to level 9, the same fall/death level the leg path
raises. That is the #28 vital-subsystem kill machinery, now real.
LAYER 3 -- the one that rewrites yesterday. The subsystem ctor DID copy
armour points + per-type scales into the private zone -- through the
ReconDamageZone PROXY, whose fields sit at struct offsets +4/+8, not the
binary's +0x140/+0x144. The floats landed on the engine object's header and
the real damageScale[] stayed zero. The 2026-07-28 experiment that "proved"
subsystem zones cannot be damaged -- and that the Myomers un-powered
self-repair was dead code in the original -- was measuring exactly this port
bug. Both verdicts reversed: the binary ctor (0x4ac7bb) initializes the zone
from the resource keys WeaponDamagePoints (required) + CriticalHitScoreBonus
(required) + Collision/Ballistic/Explosive/Laser/EnergyDamagePoints, none of
which the CSS parsed. Now parsed (with the binary's own error strings), and
the ctor writes the engine's NAMED members -- layout-parity holds, so they
land on +0x140/+0x144 faithfully. The Myomers repair branch is LIVE, in 1995
and here. KB corrected and swept (combat-damage, subsystems WAVE 6,
myomers.cpp, CLASSMAP).
Live-verified twice: [subarmor] prints real parsed scales for every subsystem
at spawn (HeatSink pts=10 scale=0.1x5, Condensers pts=5 scale=0.2x5, ...);
[critroll] landed full-chain crits in both runs (zone -> weighted pick ->
subsystem's own zone driven to 1.0 -> Destroyed); mech death/respawn and the
ammo gates un-regressed; zero crashes/asserts. Honest gaps: burst>1 spraying
is transcribed but not yet exercised live (self-damage fires burst=1), the
damageType==0 COLLISION divert (@0x49ffcc) is documented-not-reconstructed,
and the id-0x16 damage/kill report messages to the players (the authentic
stats plumbing, decoded to field level in the KB) are deferred to the #45
work.
Diags: BT_CRIT_LOG ([subarmor] + [critroll]), the existing BT_DMG_LOG.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
211 lines
17 KiB
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211 lines
17 KiB
Markdown
---
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id: subsystems
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title: "Subsystems — the factory + the reconstruction waves"
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status: established
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source_sections: "PROGRESS_LOG.md §10d; docs/SUBSYS_PLAN.md; docs/VEHICLE_SUBSYSTEMS.md; docs/RESOURCE_AUDIT.md"
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related_topics: [decomp-reference, reconstruction-gotchas, combat-damage, gauges-hud]
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key_terms: [subsystem, factory, ClassID, subsystem-roster, PoweredSubsystem, bridge]
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open_questions:
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- "Myomers coupling (gates on owning-player @mech+0x190); factory capability-roster loops 2-4 still dead (SubProxy stub)"
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---
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# Subsystems
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The mech's components (heat/power/weapons/sensor/gyro/torso/myomers/…), built by the Mech-ctor
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factory. Full per-family plan: `docs/SUBSYS_PLAN.md`; the engineering-cluster panels:
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`docs/VEHICLE_SUBSYSTEMS.md`; the layout audit: `docs/RESOURCE_AUDIT.md`. ClassID map:
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[[decomp-reference]] §2.
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## The factory
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The Mech ctor switches on the resource ClassID to build each subsystem into the [[subsystem-roster]]
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(`subsystemArray@0x128`). **The `case <Name>ClassID` LABELS are systematically MISLABELED** — the
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real class is the `// FUN_004xxxxx` ctor-address comment reconciled via `CLASSMAP.md`, not the case
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name (e.g. 0xBBE case="Sensor" is actually AggregateHeatSink). Each real class is wired via a
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`Create<Class>Subsystem(Mech*,int,void*)` **bridge** in the class's own `.cpp` (do NOT `#include` the
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real subsystem headers into mech.cpp — the local stubs collide). Keep the alloc SIZE + special-cache.
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[T2]
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## Class hierarchy (two branches, shared only at MechSubsystem)
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- **Heat leaf:** `PoweredSubsystem : HeatSink : HeatableSubsystem : MechSubsystem`. Emitter/PPC/
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Sensor/Myomers/ProjectileWeapon/MissileLauncher/GaussRifle chain here. Uses 0xC `SubsystemConnection`
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+ 0x54 `GaugeAlarm54` (alarm level at +0x14). [T1]
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- **Watcher branch:** `Torso/Gyroscope/Searchlight/ThermalSight/HUD : PowerWatcher : HeatWatcher :
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MechSubsystem`; `AmmoBin : HeatWatcher`. Uses a 0xC `WatchedConnection` + 0x54 `WatcherGaugeAlarm`. [T1]
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Making a base byte-exact GROWS every subclass — they must be re-based TOGETHER in one build, each
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`static_assert`-locked (the P7 alarm-unification: HeatSink 0x1D0 → PoweredSubsystem 0x31C → MechWeapon
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0x3F0 → Emitter 0x478). [T2]
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## Reconstruction waves (state: ALL 20 factory cases wired to real classes — 0xBD3 = the real SubsystemMessageManager since task #7, 2026-07-11; the mapper lives in roster slot 0)
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- **WAVE 1** — HeatableSubsystem re-based onto MechSubsystem (de-shadow cascade).
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- **WAVE 2** — heat family (Condenser/AggregateHeatSink/Reservoir) + HUD + MechTech (un-swap).
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- **WAVE 3** — power bus (Generator/PoweredSubsystem) + Emitter/PPC fire-path (end-to-end fire; heat
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conducts to the central sink via the linked-sink roster).
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- **WAVE 4** — standalone readouts: Sensor/Searchlight/ThermalSight/AmmoBin (de-shim, gate fixes).
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- ✅ **Searchlight + ThermalSight buttons WIRED 2026-07-25 (#61)** — both classes' handler sets were
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default-constructed blackholes (systemic cause #1, `docs/INPUT_PATH_AUDIT.md`). Each now chains
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`PowerWatcher::GetMessageHandlers()` with its own id-3 `ToggleLamp`. **Verified live**: pad `0x14`
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→ `requestedOn 0→1` → `lightState 0→1`; pad `0x12` → `requestedOn 0→1` → `thermalActive 0→1`.
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- ❌ **RETRACTED: the "ORIGINAL 1995 latent bug" (old task #63) NEVER EXISTED.** It was an artifact of
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a **swapped table attribution**: the claim compared Searchlight's Performance (@004b841c, reads
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`requestedOn`@0x1E0) against **ThermalSight's** `ToggleLamp` (@004b860c, toggles `0x1DC`) and
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concluded "no 0x1DC→0x1E0 bridge, so the lamp can never light". @004b860c is not Searchlight's.
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Searchlight's own handler is **@004b838c** (table @0x51117C) and — like every sibling — toggles the
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field its OWN Performance reads, `requestedOn`@0x1E0. Each class is internally self-consistent.
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[T1 throughout. Attribution: un-pooled `"ToggleLamp"` strings adjacent to their own class names,
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`section_dump.txt:69661-69711`. Body: @004b838c is a Ghidra EXPORT GAP (#60) but was **recovered by
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raw disasm** of `content/BTL4OPT.EXE` (`scratchpad/dis838c.py`) — it toggles 0x1E0, raises
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`updateModel` (+0x18) unconditionally, and has **NO novice gate** (ThermalSight-only).] Consequence: the searchlight→fog swap was **NOT** inert in the arcade, and
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making it work in the port is FAITHFUL, not a designer-intent deviation. See [[open-questions]] +
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[[rendering]] fog, both corrected.
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- ⚠ Still open on Searchlight: `commandedOn`@0x1DC (ctor-seeded from subsystem resource +0x28,
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@004b84dc) has **no identified role** — it is neither the toggle target nor read by @004b841c, and
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it measured **21** live (not a boolean), which hints our SubsystemResource +0x28 ≠ the binary's.
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- ⚠ ThermalSight's published attributes are mis-named: we publish `"LightState"→thermalActive@0x1D8`,
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but the binary's table @0x511268 has **`"LightOn"`(id 3)→0x1D8** and `"LightState"`(id 4)→**0x1E0**
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(the alarm). A gauge binding `ThermalSight/LightOn` currently misses. Not yet changed (gauge-binding
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change needs its own verification pass).
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- **WAVE 5** — Torso (aim twist/elevation; joint-I/O reconstructed; the BLH record disables torso →
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faithfully no visible twist).
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- **WAVE 6** — Myomers (mover-coupled; structural un-stub is INERT — no live mover/heat coupling).
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⚠ **The registered Performance is the WRAPPER @004b8b9c, not the inner integrator @004b8d18**
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[T1, fixed 2026-07-28]. The ctor @004b8fec stores `[0x511620]` into activePerformance, and that
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pointer resolves to `0x4b8b9c`, whose first instruction is `call 0x4b0bd0` =
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`PoweredSubsystem::PoweredSubsystemSimulation`; @004b8d18 is the drive-heat integrator it then
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runs. The port had registered the INNER function, so Myomers never advanced its own electrical
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state machine — and since that machine is the only thing that both enters `NoVoltage`
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(`source == 0`) and walks it back (`NoVoltage → Starting → Ready`), a Myomers that lost power in
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the death/reset window stayed there **forever**. The Torso is a PowerWatcher that MIRRORS its
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watched subsystem, so `torso.cpp:570` held `effectiveTwistRate` at 0 = **Gitea #70, "torso twist
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stops working after a death/respawn."** Measured: 2 dead windows per respawn before, 0 after;
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pristine missions never showed it. **Order is load-bearing** — the base call precedes the
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heat-model gate, and gating first also denied the electrical machine to every non-expert pilot
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(`OwnerAdvancedDamage()` is the +0x260 flag, off below veteran).
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**General rule this establishes:** when a subsystem's Performance address in a `PTR_LAB_*` slot
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does not match the function you reconstructed, check whether the real target is a wrapper that
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chains the base sim — the whole family does (`Generator`/`PoweredSubsystem` lead with
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`HeatSink::HeatSinkSimulation`; the Torso's own perf @004b5cf0 leads with `UpdateWatch`).
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**The full wrapper is now reconstructed** [T1/T2, 2026-07-28] — five blocks in binary order:
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`@004b8bab` chain `PoweredSubsystemSimulation`; `@004b8bb9` the un-powered self-repair (see below);
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`@004b8c1e` republish `outputVoltage@0x344` from the resolved source when the alarm is Ready;
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`@004b8c5a` republish `speedEffect@0x31C` = `AvailableOutput(clamped V) / OwnerBaseSpeed()` — the
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Mech base speed CANCELS, so `speedEffect` is a **0..1 fraction** of full drive carrying gear ratio,
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thermal curve and zone damage; `@004b8ceb` run the inner integrator **only when `outputVoltage > 0`**.
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Verified live: healthy `outV=10000 speed=1`, un-powered `outV=0 speed=0`, and 96/96 torso samples at
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`elec=4` across two death/respawn cycles.
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✅ **CORRECTED 2026-07-29 (#80): `@004b8bb9` — the un-powered self-repair — is LIVE, in 1995 and
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now in the port.** The 2026-07-28 "dead code in the original too" verdict here was wrong about the
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original: the frozen-at-0.6 experiment was measuring a PORT bug (the subsystem ctor wrote the
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zone's armour/scales through the `ReconDamageZone` proxy at struct offsets +4/+8 instead of the
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engine members at +0x140/+0x144, so the real `damageScale[]` stayed zero). The binary ctor
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(`@0x4ac7bb`) initializes them from the resource keys `WeaponDamagePoints` + the five per-type
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`...DamagePoints`; the port now does the same through the engine's named members, and the CSS
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parses the keys. An un-powered, not-yet-destroyed myomer heals at `0.011 × damageScale[Explosive]`
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per tick. The retracted "cannot damage a subsystem's own zone" rule is superseded — see
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[[combat-damage]] §CORRECTED for the full mechanism (this also revived the crit sink, #80).
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Also un-stubbed here: `Myomers::DamageStructureLevel()` returned a hardcoded `0.0f`, which pinned
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`AvailableOutput`'s `(1 - damage)` factor at 1 — a shot-up myomer drove exactly as well as a fresh
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one. Now routed to the base bridge `GetSubsystemDamageLevel()`; measured `dmg=0.6 → speed=0.4`.
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- **WAVE 7** — projectile/missile weapons (byte-exact; flying projectiles are a PORT reconstruction —
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the 2007 Entity is 0x1BC vs the binary's 0x300, so raw base-offset reads fail).
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- **TASK #56 (2026-07-11)** — Gyroscope LIVE byte-exact (ctor @004b3778, sizeof 0x3D0 locked;
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integrators + `FUN_004b2980` damage fan-out; joint dispatch from the Mech performance tail
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@0x4aaf74/83; `BT_GYRO_LOG`/`BT_GYRO_TRACE`) — see [[cockpit-view]].
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- **✅ DONE (task #7, `afefaee`)** — SubsystemMessageManager 0xBD3 (a
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**damage/explosion consolidation hub** cached to `Mech[0x10d]`=0x434; the factory builds the REAL
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class and `mech.hpp` names the slot `messageManager` — the old `controlsMapper` mislabel is swept,
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the real mapper is roster slot 0. NOT the valve/heat-model gate — that's the owning **BTPlayer**
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@mech+0x190 carrying the EXPERIENCE-level flags, see [[experience-levels]]). [T2]
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## The watcher electrical chain (task #57, 2026-07-13 — the torso power gate)
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The Watcher branch is POWERED indirectly: a watcher WATCHES another roster subsystem and mirrors
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its electrical state. The full chain, byte-verified [T1]:
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- **Data:** the model entry `WatchedSubsystem=<name>` → segment index **+2** at resource+0xE4
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(`HeatWatcher::CreateStreamedSubsystem` @004aec54); the ctor @004aeb40 stores it at
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watcher+0x128 (`watchedSubsystem`).
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- **Bind (factory post-roster loop 1):** vtable slot 14 (+0x38) — `@004aee2c` (HeatWatcher) /
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`@004b1a40` (PowerWatcher/Torso override, byte-identical); **Ghidra missed both function
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starts** (recovered from raw bytes; the vtables.tsv rows have GAPS where the exporter skipped
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slots — dump the exe bytes at vtable+slot*4 when a slot looks missing). Master-gated
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(`(owner->simulationFlags & 0xC)==0 && (flags & 0x100)`); binds `watchedLink(+0x114).Add(
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owner->roster[+0x128][watchedSubsystem])`. Port: `BTWatcherWatchedIndex`/`BTWatcherBindTarget`
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bridges (heatfamily_reslice.cpp) called from the mech.cpp factory loop.
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- **Tick:** `@004b181c` = the REAL `PowerWatcher` Performance (PTR @0050f5fc → 004b181c) =
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`UpdateWatch()`: heat mirror (FUN_004aeac4) + `watchdogAlarm.SetLevel(watched->electrical
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level @+0x278)` + brownout downgrade to 1 when `gen->outputVoltage(+0x1DC) <= minVoltage(+0x180)
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× gen->ratedVoltage(+0x1D8)`. The Torso sims (@004b5cf0/@004b65f8) call it first-line.
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(`@004b1804` is slot-10 **ResetToInitialState**, NOT the Simulation — old recon mislabel, fixed.)
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- **MinVoltageScale = 0.01** — a 10-byte x87 literal at 0x4b1924 (`0a d7 a3 70 3d 0a d7 a3 f8 3f`);
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the port had 1.0f, making minVoltage 100× too big → the brownout latched every watchdog at 1.
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- **PowerWatcher::GetClassDerivations chains HeatWatcher** (real base) — the old HeatableSubsystem
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stand-in broke `IsDerivedFrom(HeatWatcher)` for Torso/Searchlight/ThermalSight and silently
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skipped them in the connect pass.
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- **Effect:** `Torso::ElectricalStateLevel()==Ready(4)` un-gates `effectiveTwistRate` — the MadCat
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torso twists at its authored 50°/s (±140° limits, roster 17 watching 15 → generator @10000V);
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the BLH is authentically fixed (`horizontalEnabled=0`, limits ±0.01°). [T2 live-verified]
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- **STILL DEAD:** factory loops 2-4 (heatable/weapon/damageable capability rosters) go through the
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`SubProxy` stub whose `IsDerivedFrom` returns 0 — they add NOTHING. See [[open-questions]].
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## The coolant FLUSH (Gitea #7, 2026-07-19) — Reservoir InjectCoolant end-to-end [T2 live-verified]
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The manual-p24 coolant button (coolant MFD top-right; punch or HOLD): message id **4 "InjectCoolant"**
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on the Reservoir (handler table @**0x50e680**, one entry → @4aee70 — same per-receiver id space as the
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Condenser's MoveValve @0x50E52C). Handler @4aee70: novice-lockout gate (FUN_004ac9c8), press
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(data≥1) → `reservoirAlarm.SetLevel(1)` **gated on coolantLevel@0x12C > 0** (+300 decimal = 0x12C =
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coolantLevel — the old "currentTemperature" reading was a misdecode), release → level 0; ForceUpdate.
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While level==1 the CoolantSimulation Performance (@4aef78) runs **InjectCoolant @4aefa4** each frame:
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work list = condenser chain @+0x7cc + weapon chain @+0x7bc + heatable chain @+0x7ac + linkedSinks
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master (port walks the roster with the same membership tests — chains are SubProxy-dead; condensers/
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weapons/bank get the binary's duplicate-visit weighting; watcher-branch members are filtered to
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HeatSink [T2 guarded]); per sink with flowScale@0x15C≠0: move `squirtMass@0x224 × flowScale × dt`
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clamped to [-resLevel, 0] (reservoir drains → the coolant vertBar C `Reservoir/CoolantMass` drops),
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sink level clamped [0, capacity], and `pendingHeat@0x1C8 += -(sinkE×|Δ|/sinkLvl − resE×|Δ|/resLvl)`
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capped at `sinkMass@0x154 × res->startingTemperature@0x13C`, clamped ≤0 (only cools) — the heat
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relief rides the existing heat model. **Two ctor corrections surfaced:** (1) the master gate @4af408
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(and @4aeb40 HeatWatcher) reads `*(param_2+0x28)` = the **owner MECH's simulationFlags**, not the
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resource's subsystemFlags (the resource read left the Reservoir Performance unregistered → no drain);
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(2) `(float10)*(int*)(link+0x1d0)` is a **FILD of the bank's integer HeatSinkCount** — capacity =
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0.05 (`_DAT_004af518`) × heatSinkCount × streamed CoolantCapacity (BLH: 0.05×6×20 = 6), not a float
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reinterpret (which gave ~1e-44 → empty tank). Visual: the binary's mode-1 coolant-effect renderable
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(FUN_00456a68, built for classID 0xBC0 on the "ReservoirState" attr, part_014.c:5439; tick
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@part_007.c:8780) spawns **psfx 19 = FLUSH.PFX** ("Coolant flush", BTDPL.INI:1018, bluish smoke) on
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the state's 0→1 edge — port: `BTSpawnFlushCloud` (mech4.cpp) on the same alarm edge, attached emitter
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at torso height. Audio (CoolantDump layers) rides the ReservoirState watchers. Desktop input: **'H'
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HELD = Flush** (CONTROLS.MAP action; press+release dispatch). Diags: `BT_FLUSH_LOG` ([flush-tx]
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press/release, [flush] level drain, cloud spawn), `BT_FLUSH_TEST=<frame>` scripted ~2 s hold.
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Verified live (FOGDAY): level 6→0 over ~0.6 s held (≈3-4 short punches to empty — matches the
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manual), bluish cloud screenshot-confirmed (scratchpad/flush_cloud.png). Replicant note: the state
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receive @4aeef8 sets the alarm from the state stream — the port's reservoir state replication is not
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wired, so remote clouds are deferred (solo/master path complete).
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## Valve boost A/B/C (2026-07-23, field "boosted loop still cooked" audit) [T2 measured]
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Blackhawk, sustained BT_AUTOFIRE, 150 s soaks, `[heat-t]` 5 s cadence. Valve shares are
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zero-sum (`valveState/Σ`); detent cycle per press = **1 → 5 → 50 → 0 (CLOSED) → 1** (@4ae464,
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one past max turns the loop OFF). SRM6s (+ GeneratorB + Avionics) are on **Condenser2**
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([heat-link] dump; the MFD loop readout matches the heatSinkIndex truth). Results, SRM6_1:
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- **boost 2 (share 0.91)**: plateau ~531, then COOLS under nonstop fire — never jams/fails.
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- **balanced (0.167)**: ~1162 @ 70 s and climbing (the jam band; field jams logged 1043-1469).
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- **starved (0.018)**: ~1440 @ 70 s, slope → the 2000 FailureHeat line.
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The valve mechanic is REAL and powerful; MoveValve reruns the redistribute on every press
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(not a placebo), veteran role passes the guard. The field double-failure with "loop 2
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boosted" is therefore a DETENT question — most likely one press past max (detent 0 = closed,
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share 0) — now diagnosable: valve presses log always-on (`[valve] ... -> detent N`, with a
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CLOSED warning). Solo clock shim verified the same day (60 s egg self-ends;
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`[mission] solo game clock expired`).
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## The four systemic checks (every subsystem)
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See [[reconstruction-gotchas]]: (1) shadowing (re-declared engine-base fields), (2) the `Wword` trap,
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(3) message-handler chaining, (4) entity validity. Plus resource-struct layout (must mirror the class
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hierarchy, byte-exact — the RESOURCE_AUDIT found 8 bugs) and object-layout (alias/phantom/interior
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fields). A `+0x128`-style owner offset is the ROSTER, not the segment table (the heat-link type
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confusion that caused a heap-corruption via OOB `ConductHeat` writes). [T2]
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## Engineering cluster panels (`vehicleSubSystems`)
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Not a widget — a per-subsystem FACTORY (`FUN_004cbaf0`) building a status CLUSTER onto one of 12 aux
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MFD positions, dispatching on classID → HeatSinkCluster/MyomerCluster/EnergyWeaponCluster/
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BallisticWeaponCluster. Reads `PoweredSubsystem::auxScreenNumber/Placement/Label` (res +0x104/8/C) via
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the `BTGetSubsystemAuxScreen` bridge. See `docs/VEHICLE_SUBSYSTEMS.md` + [[gauges-hud]]. [T2]
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## Key Relationships
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- Data: [[decomp-reference]] (ClassIDs/hierarchy). Bugs: [[reconstruction-gotchas]].
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- Feeds: [[combat-damage]] (weapons/damage), [[gauges-hud]] (attribute state).
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- Plan: `docs/SUBSYS_PLAN.md`.
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