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BT412/game/reconstructed/sensor.cpp
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arcattackandClaude Opus 4.8 7b7d465e5e Initial commit: bt411 -- standalone Windows BattleTech (Tesla 4.10 port) 
Clean, self-contained extraction of the BattleTech-specific work from the
reverse-engineering workspace -- engine + game + content + build, with nothing
from Red Planet or the raw archive dumps. Builds green (Win32) and runs the
single-player drive->animate->target->fire->damage->destroy loop out of the box.

Layout:
  engine/   MUNGA + MUNGA_L4 shared 2007 engine, carrying our BT render/loader
            work (bgfload/L4D3D/L4VIDEO: BSL bit-slice decode, LOD/ground/shadow
            models) + image codec; the minimal rp/ headers the audio HAL needs
  game/     reconstructed BT logic + surviving-original BT source + fwd shims
            + WinMain launcher
  content/  full runtime tree (BTL4.RES, VIDEO/, GAUGE/, AUDIO/, eggs, BTDPL.INI)
  docs/     format specs + reconstruction ledgers
  reference/ raw Ghidra pseudocode (recon source-of-truth) + decomp exporter
  tools/    MP console emulator + map/resource scanners

One top-level CMake builds munga_engine lib + bt410_l4 game lib + btl4.exe.
All paths relativized (186 fwd shims + ~437 CMake abs paths -> repo-relative);
DXSDK is the one external, overridable via -DDXSDK. Verified: builds to a
byte-identical 2.27MB exe and runs combat (TARGET DESTROYED, 0 crashes) against
the bundled content.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-05 21:03:40 -05:00

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//===========================================================================//
// File: sensor.cpp //
// Project: BattleTech //
// Contents: Sensor subsystem -- radar/targeting effectiveness model //
//---------------------------------------------------------------------------//
// Date Who Modification //
// -------- --- ---------------------------------------------------------- //
// 8/10/95 GDU Initial coding. //
//---------------------------------------------------------------------------//
// Copyright (C) 1995, Virtual World Entertainment, Inc. All Rights reserved //
// PROPRIETARY AND CONFIDENTIAL //
//===========================================================================//
//
// RECONSTRUCTED from the shipped binary (Ghidra pseudo-C, recovered shards
// part_012.c / part_013.c) cross-referenced with the surviving SENSOR.HPP and
// the sibling subsystem sources (powersub.hpp/.cpp, heat.hpp/.cpp). Each
// non-trivial method cites the originating @ADDR. Hex float constants have
// been converted to decimal:
// 0x3f800000 = 1.0f 0x3f000000 = 0.5f
//
// ---------------------------------------------------------------------------
// HOW THE SENSOR WAS LOCATED (and a corrected class identification)
// ---------------------------------------------------------------------------
// The Mech ctor (mech.cpp @004a1674) streams one Subsystem per segment via a
// switch over the streamed ClassID (part_012.c @~0x9978). The slot the prior
// mech.cpp reconstruction named "sensorSubsystem" (this[0x1f7]) is filled by
// case 0xBBE -> ctor FUN_004ae8d0, allocation 0x1E4. That object is far too
// small to be a PoweredSubsystem-derived Sensor (PoweredSubsystem alone is
// 0x31C bytes), so 0xBBE / 4ae8d0 is NOT the SENSOR.HPP Sensor -- that label
// in mech.cpp is a mis-guess (the slot caches some smaller HeatSink-family
// subsystem).
//
// The real Sensor is case 0xBC3 -> ctor FUN_004b1d18, allocation 0x328
// (= PoweredSubsystem 0x31C + three Scalar/Logical members at 0x31C/0x320/
// 0x324). Proof:
// * The shipped string pool @0050fae0 reads "Sensor\0RadarPercent\0
// SelfTest\0BadVoltage\0".
// * The AttributePointers IndexEntry table @0050fa50 binds those three
// names to attribute IDs 0x12/0x13/0x14 at object offsets 0x31C/0x320/
// 0x324 -- exactly SENSOR.HPP's radarPercent / selfTest / badVoltage and
// its RadarPercent/SelfTest/BadVoltage AttributeIDs.
// * CreateStreamedSubsystem @004b1dcc stamps classID 0xBC3 and model size
// 0x190 and parses no extra fields -- matching the empty
// Sensor__SubsystemResource in SENSOR.HPP.
//
// The earlier powersub.cpp/CLASSMAP work labelled this same class "Myomers"
// (vtable 0050fb0c, ctor 4b1d18) with INFERRED members
// outputVoltage/powered/voltageAvailable -- there is no "Myomers"/
// "OutputVoltage" string evidence for those. The recovered strings settle
// it: vtable 0050fb0c / ctor 4b1d18 / classID 0xBC3 is Sensor.
//
// Helper-function name mapping (engine internals referenced by the decomp):
// FUN_004b0f74 PoweredSubsystem base constructor (powersub.cpp)
// FUN_004b0bd0 PoweredSubsystem::PoweredSubsystemSimulation
// FUN_004b0e6c PoweredSubsystem::ResetToInitialState(powered)
// FUN_004b0efc PoweredSubsystem::HandleMessage
// FUN_004b115c PoweredSubsystem destructor
// FUN_0041b9ec AlarmIndicator(levels)
// FUN_0041bbd8 AlarmIndicator::SetLevel(n)
// FUN_0041a1a4 IsDerivedFrom(classDerivations)
// FUN_004022d0 operator delete / global free
// FUN_00402298 Memory::Allocate
//
#include <bt.hpp>
#pragma hdrstop
#if !defined(SENSOR_HPP)
# include <sensor.hpp>
#endif
#if !defined(APP_HPP)
# include <app.hpp>
#endif
#if !defined(TESTBT_HPP)
# include <testbt.hpp>
#endif
//
// Tuning constants observed as read-only float globals adjacent to the
// SensorSimulation body (.rdata @004b1d10/@004b1d14, recovered from
// section_dump.txt).
//
static const Scalar RadarBaseline = 1.0f; // _DAT_004b1d10 (0x3f800000)
static const Scalar HeatDegradationScale = 0.5f; // _DAT_004b1d14 (0x3f000000)
//###########################################################################
//###########################################################################
// Sensor
//###########################################################################
//###########################################################################
//#############################################################################
// Shared Data Support
//
// DefaultData @0050fa1c, ClassDerivations @0050fa2c.
//
Derivation
Sensor::ClassDerivations(
PoweredSubsystem::GetClassDerivations(),
"Sensor"
);
Receiver::MessageHandlerSet
Sensor::MessageHandlers;
Sensor::AttributeIndexSet
Sensor::AttributeIndex;
Sensor::SharedData
Sensor::DefaultData(
&Sensor::ClassDerivations,
Sensor::MessageHandlers,
Sensor::AttributeIndex,
Sensor::StateCount
);
//#############################################################################
// Construction / Destruction
//
// @004b1d18 -- chains to the PoweredSubsystem ctor (FUN_004b0f74) passing
// Sensor::DefaultData (&DAT_0050fa1c), installs the Sensor vtable
// (PTR_FUN_0050fb0c), primes the three sensor members, marks the subsystem as
// carrying a per-frame Performance (instance flag bit 0x8 at this[0x28]) and
// -- unless this is a damaged copy segment (segment flags & 0xC == 4) --
// registers SensorSimulation as the active Performance (this[7..9], the
// 12-byte member-function pointer at PTR_FUN_0050fa94).
//
Sensor::Sensor(
Mech *owner,
int subsystem_ID,
SubsystemResource *subsystem_resource
):
PoweredSubsystem(owner, subsystem_ID, subsystem_resource, DefaultData)
{
Check(owner);
Check_Pointer(subsystem_resource);
segmentFlags = 0;
hasActivePerformance = False;
heatStateLevel = NormalHeat;
heatModelOff = False;
electricalState = Ready;
radarPercent = RadarBaseline; // @0x31C = 1.0f
selfTest = False; // @0x320 = 0
badVoltage = False; // @0x324 = 0
// this[0x28] |= 0x8 -- flag "has an active per-frame Performance".
SetHasPerformanceFlag(); // param_1[10] |= 8
// INTEGRATION (gate reconcile): read OWNER simulationFlags (param_2+0x28) —
// the oracle-verified authoritative source — not the local segment shim.
// Sensor installs its per-frame Performance unless it is a damaged copy
// segment (owner flags & 0xC == 4); a live master (== 0) arms it.
if ((owner->simulationFlags & SegmentCopyMask) != 4) // (owner flags & 0xC) != 4
{
SetPerformance(&Sensor::SensorSimulation); // this[7..9] = &SensorSimulation
}
Check_Fpu();
}
//
// @004b1d90 -- reinstalls the vtable, clears the owning Mech's cached sensor
// back-reference ( *(owner + 0x374) = 0 ), then chains to ~PoweredSubsystem
// (FUN_004b115c) and frees the block when the deleting-dtor bit is set.
//
Sensor::~Sensor()
{
Check(this);
// *(this->owner + 0x374) = 0; -- drop Mech's cached sensor pointer
Check_Fpu();
}
//###########################################################################
// TestInstance -- Sensor
//
// @004b1e18 -> FUN_0041a1a4(**this[3], 0x50fa2c) (Sensor::ClassDerivations)
//
Logical
Sensor::TestInstance() const
{
return IsDerivedFrom(ClassDerivations);
}
//###########################################################################
// TestClass -- Sensor
//
// Standard subsystem TestClass (cf. HeatSink/PoweredSubsystem). BEST-EFFORT:
// no distinct Sensor body was captured; the family convention returns True.
//
Logical
Sensor::TestClass(Mech &)
{
return True;
}
//###########################################################################
// ResetToInitialState -- Sensor
//
// @004b1c18 (vtable slot 10). When (re)powering, re-primes the three sensor
// members to their ctor defaults, then chains to
// PoweredSubsystem::ResetToInitialState (FUN_004b0e6c).
//
// NOTE: the captured override takes the inherited `powered` flag
// (PoweredSubsystem::ResetToInitialState(Logical powered=True)); SENSOR.HPP
// declares it argument-less, so the default is shown here.
//
void
Sensor::ResetToInitialState()
{
const Logical powered = True;
if (powered)
{
radarPercent = RadarBaseline; // 1.0f
selfTest = False;
badVoltage = False;
}
PoweredSubsystem::ResetToInitialState(powered); // FUN_004b0e6c
}
//#############################################################################
// Per-frame simulation
//
//
// @004b1c4c -- the registered Performance. Runs the base powered-subsystem
// electrical update first, then derives the three sensor readouts from the
// thermal + electrical state:
//
// radarPercent = RadarBaseline - master->heatEnergy (this[0x38]->+0x158)
//
// * if the linked thermal master reports "heat model off" (this[0x10]==1):
// radarPercent = 0, selfTest = 0
// else
// selfTest = 1
//
// * if the electrical state alarm (PoweredSubsystem electricalStateAlarm
// level @0x278, this[0x9e]) is Ready(4):
// badVoltage = 0
// else
// badVoltage = 1, radarPercent = 0 (no power -> blind)
//
// * finally the heat-state alarm level (this[0x61] @0x184) trims the radar:
// NormalHeat(0) -> selfTest = 1
// DegradationHeat(1) -> radarPercent *= 0.5f, selfTest = 1
// FailureHeat(2) -> radarPercent = 0, selfTest = 0
//
void
Sensor::SensorSimulation(Scalar time_slice)
{
Check(this);
PoweredSubsystem::PoweredSubsystemSimulation(time_slice); // FUN_004b0bd0
// this[0x38] is the resolved thermal master sink; +0x158 == heatEnergy.
radarPercent = RadarBaseline - HeatMasterEnergy();
if (HeatModelOff()) // this[0x10] == 1
{
radarPercent = 0.0f;
selfTest = False;
}
else
{
selfTest = True;
}
if (ElectricalStateLevel() == Ready) // this[0x9e] (@0x278) == 4
{
badVoltage = False;
}
else
{
badVoltage = True;
radarPercent = 0.0f;
}
switch (HeatStateLevel()) // this[0x61] (@0x184)
{
case NormalHeat: // 0
selfTest = True;
break;
case DegradationHeat: // 1
radarPercent *= HeatDegradationScale; // *= 0.5f
selfTest = True;
break;
case FailureHeat: // 2
radarPercent = 0.0f;
selfTest = False;
break;
default:
break;
}
Check_Fpu();
}
//#############################################################################
// Death and Damage Support
//
// BEST-EFFORT. No Sensor-specific TakeDamage / DeathReset bodies were
// captured; the Sensor vtable (@0050fb0c) carries the inherited
// PoweredSubsystem / HeatSink addresses in the damage/death slots. The
// bodies below simply chain to the base so the SENSOR.HPP interface compiles;
// a human should verify whether sensor.cpp originally added behaviour here.
//
void
Sensor::TakeDamage(Damage &damage)
{
PoweredSubsystem::TakeDamage(damage); // TODO: verify (inherited slot)
}
void
Sensor::DeathReset(Logical full_recovery)
{
PoweredSubsystem::DeathReset(full_recovery); // TODO: verify (inherited slot)
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CreateStreamedSubsystem -- Sensor
//
// @004b1dcc -- chains to PoweredSubsystem::CreateStreamedSubsystem
// (FUN_004b13ac) then stamps the resource:
// resource->classID = 0x0BC3 (resource +0x20)
// resource->subsystemModelSize = 0x190 (resource +0x24)
// No Sensor-specific resource fields are read (the Sensor resource record is
// an empty extension of the PoweredSubsystem record).
//
int
Sensor::CreateStreamedSubsystem(
NotationFile *model_file,
const char *model_name,
const char *subsystem_name,
SubsystemResource *subsystem_resource,
NotationFile *subsystem_file,
const ResourceDirectories *directories,
int passes
)
{
if (
!PoweredSubsystem::CreateStreamedSubsystem( // FUN_004b13ac
model_file, model_name, subsystem_name,
subsystem_resource, subsystem_file, directories, passes
)
)
{
return False;
}
subsystem_resource->subsystemModelSize = sizeof(*subsystem_resource); // 0x190
subsystem_resource->classID = RegisteredClass::SensorClassID; // 0x0BC3
Check_Fpu();
return True;
}
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