arcattackandClaude Opus 4.8
12fbc023a8
Area-of-effect blast on missile detonation, from the T0 source EXPLODE.cpp:50-254 (@0042fad0) + the arcade decomp. Fires on ANY missile impact (world or mech) -- the +0x360 gate sits in the Missile::Perform collision branch (part_013.c:10097). Only missiles splash; the AC's tracer is not a Missile. Radius source CORRECTED: it is the ROUND's own GameModel (type-0xf) +0x50, seeded from the launcher's linked AmmoBin ammoModelFile @0x1e8 (part_013.c:8778) -- NOT the launcher's ExplosionModelFile (which resolved to 0). Live-resolved radius = 30 for both MP missile launchers; 0 for AC/Emitters. Burst falloff = baseBurst / dist^exp floored at 1 (arcade 1.25 = decomp 0x3ff40000; WinTesla EXPLODE.cpp:209 drifted to 1.2f). damageType/amount pass through unchanged; only burstCount, radial damageForce, and impactPoint are set. Excludes shooter + direct victim; dist>radius gated; delivered via msgmgr (cross-pod) or Dispatch. New: BTResolveSplashRadius / BTApplySplashDamage (mech4.cpp), hooked at both the world-impact and contact detonation paths; BTAmmoRoundModelResource bridge (ammobin). Env: BT_SPLASH_LOG, BT_SPLASH_TEST (synthetic near-miss), BT_AF_MISSILE (missile autofire). Verified: near-miss dist=15 -> 1 burst to a bystander; live missiles detonate + exclude the direct victim; AC does not splash; no crash. Deferred (T3): per-player enable sub-gate missile+0x360 = BTPlayer+0x264 (writers read as a per-frame toggle, not a config flag) -- port treats SplashRadius>0 as the enable. KB: combat-damage.md + open-questions.md updated. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
228 lines
9.9 KiB
C++
228 lines
9.9 KiB
C++
//============================================================================//
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// File: ammobin.hpp //
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// Project: BattleTech //
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// Contents: Ammunition bin -- holds rounds, feeds a ProjectileWeapon, and //
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// cooks off when overheated. //
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//----------------------------------------------------------------------------//
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// Date Who Modification //
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// -------- --- ------------------------------------------------------------//
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// 04/13/95 JM Initial coding. //
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//----------------------------------------------------------------------------//
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// Copyright (C) 1995, Virtual World Entertainment, Inc. All Rights reserved //
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// PROPRIETARY AND CONFIDENTIAL //
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//============================================================================//
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//
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// RECONSTRUCTED from the shipped binary (Ghidra pseudo-C, module cluster
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// @004bd2c0-@004bdb94 + CSS @004bd6f0 in part_013.c). Only the test fragment
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// AMMOBIN.TCP survives (AmmoBin::TestClass -> True; AmmoBin::ResetToInitialState
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// -> empty). Member/method names are inferred from the streamed resource keys
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// ("AmmoCount"/"FeedRate"/"AmmoClassID"/"ProjectileClassID"/"MissileClassID"/
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// "AmmoModelFile"/"ExplosionModelFile") and from usage; see ammobin.cpp for the
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// per-method @ADDR evidence. Names past the HeatWatcher base are best-effort.
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//
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// Inheritance chain established from the decomp:
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// Subsystem -> HeatableSubsystem -> HeatWatcher (ctor @4aeb40, vtable
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// @0050ed10) -> AmmoBin (ctor @4bd5c4, vtable @0051286c, classID 0x0BCB).
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// AmmoBin IS a HeatWatcher: it watches a temperature against the resource's
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// degradation/failure thresholds, and when the watch alarm (this+0x140) reaches
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// FAILURE it arms a randomised cook-off timer that dumps all stored rounds'
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// heat into the mech and empties the bin. A ProjectileWeapon links to it as a
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// SharedData connection (launcher this[0x10F]@0x43C, connection ctor @4bcbb0,
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// vtable @00512424) and pulls a round via FeedAmmo() each time it fires.
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//
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// Object byte offsets (this is an int* in the decomp, word index in parens).
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// Everything below +0x180 is the HeatWatcher / HeatableSubsystem / Subsystem
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// base (watch heatAlarm level @0x140 = word 0x50; base status alarm @0x2C).
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//
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#if !defined (AMMOBIN_HPP)
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# define AMMOBIN_HPP
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# if !defined(HEATFAMILY_RESLICE_HPP)
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# include <heatfamily_reslice.hpp> // HeatWatcher base (heat family)
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# endif
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//######################### Forward Class Declarations ########################
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class Mech;
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//###########################################################################
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//################# AmmoBin Model Resource ##############################
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//###########################################################################
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//
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// Streamed by AmmoBin::CreateStreamedSubsystem @004bd6f0 (record size 0x104,
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// classID 0x0BCB). The ammo-specific block sits at +0xF0 past the heat-watcher
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// resource header. "AmmoClassID" accepts the symbolic forms "ProjectileClassID"
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// (stamps 0x0BD1) and "MissileClassID" (stamps 0x0BBA), naming the entity class
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// the bin spawns when a round is fired.
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//
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struct AmmoBin__SubsystemResource:
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public HeatWatcher::SubsystemResource
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{
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int ammoClassID; // +0xF0 "AmmoClassID"/"ProjectileClassID"/"MissileClassID"
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int ammoModelFile; // +0xF4 "AmmoModelFile" (resolved model index)
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int explosionModelFile; // +0xF8 "ExplosionModelFile" (resolved model index)
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int ammoCount; // +0xFC "AmmoCount"
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Scalar feedRate; // +0x100 "FeedRate" (seconds per round feed)
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}; // ends 0x104
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static_assert(offsetof(AmmoBin__SubsystemResource, ammoClassID) == 0xF0, "AmmoBin ammoClassID must be at 0xF0");
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static_assert(offsetof(AmmoBin__SubsystemResource, feedRate) == 0x100, "AmmoBin feedRate must be at 0x100");
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static_assert(sizeof(AmmoBin__SubsystemResource) == 0x104, "AmmoBin record must be 0x104");
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//###########################################################################
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//######################### CLASS -- AmmoBin #########################
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//###########################################################################
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//
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// (vtable @0051286c, ctor @004bd5c4, dtor @004bd6b0, CSS @004bd6f0.)
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//
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class AmmoBin:
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public HeatWatcher
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{
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friend struct AmmoBinLayoutCheck; // compile-time offset locks (ammobin.cpp)
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friend int *BTAmmoBinCountPtr(void *bin); // panel ammo counter bridge (Streak fix)
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friend int BTAmmoBinFeeding(void *bin); // panel reload-state bridge
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friend int BTAmmoRoundModelResource(void *bin); // splash-radius resolve (round GameModel +0x50)
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Shared Data Support
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//
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public:
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static Derivation ClassDerivations; // IsDerivedFrom tag 0x512488
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static Receiver::MessageHandlerSet MessageHandlers;
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static AttributeIndexSet AttributeIndex;
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static SharedData DefaultData; // resolved as &DAT_005125bc
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Ammo feed state machine (this->ammoAlarm @0x194, level @0x1A8 = word 0x6A)
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//
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// The 6-level AlarmIndicator carries the feed cycle. Levels confirmed from
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// usage; 3 and 4 are unobserved.
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//
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public:
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enum AmmoState {
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Feeding = 0, // a round is in transit (feedTimer counting down)
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Loaded = 1, // a round is chambered and ready to fire
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Empty = 2, // no rounds remain
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Dumped = 5 // transient pulse raised by DumpAmmo() before Empty
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};
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Model Support
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//
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public:
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enum {
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CookingOff = HeatWatcher::StateCount,
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StateCount
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};
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typedef void
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(AmmoBin::*Performance)(Scalar time_slice);
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// @004bd394 -- the registered Performance. Drives the watch alarm, ticks
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// the feed timer (Feeding -> Loaded), arms/fires the cook-off, and trips
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// the Empty alarm when exhausted.
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void
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AmmoBinSimulation(Scalar time_slice);
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void
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SetPerformance(Performance performance)
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{
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Check(this);
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activePerformance = (Simulation::Performance)performance;
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Ammo feed interface (called by the linked ProjectileWeapon)
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//
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public:
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// @004bd4f4 -- request one round. When Loaded: chamber the next round,
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// reset the feed timer to feedRate, decrement ammoCount, and return the
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// remaining count (Empty alarm raised at 0). Returns 0 if not ready /
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// already feeding / empty / destroyed.
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int
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FeedAmmo();
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// @004bd588 -- forcibly empty the bin (eject / strip): zero ammoCount and
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// pulse the alarm Dumped(5) -> Empty(2).
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void
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DumpAmmo();
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Subsystem virtual overrides (vtable @0051286c)
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//
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public:
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Logical
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HandleMessage(int message); // slot 8, @004bdb94
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void
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ReadUpdateRecord(UpdateRecord *update); // slot 9, @004bd2c0
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void
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ResetToInitialState(); // slot 10 (AMMOBIN.TCP: empty)
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Local helpers
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//
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protected:
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// @004bd300 -- cook-off: inject (ammoCount * heatPerRound) heat into the
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// mech, then zero ammoCount and raise the Empty alarm.
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void
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CookOff();
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// TestClass Support (AMMOBIN.TCP)
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//
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public:
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static Logical
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TestClass(Mech &); // AMMOBIN.TCP: returns True
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Logical
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TestInstance() const; // @004bd1e0
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Construction and Destruction
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//
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public:
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typedef AmmoBin__SubsystemResource SubsystemResource;
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AmmoBin( // @004bd5c4
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Mech *owner,
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int subsystem_ID,
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SubsystemResource *subsystem_resource
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);
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~AmmoBin(); // @004bd6b0
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static int
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CreateStreamedSubsystem( // @004bd6f0 (record size 0x104)
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NotationFile *model_file,
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const char *model_name,
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const char *subsystem_name,
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SubsystemResource *subsystem_resource,
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NotationFile *subsystem_file,
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const ResourceDirectories *directories,
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int passes = 1
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);
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Local data appended past the HeatWatcher base (offsets best-effort).
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//
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protected:
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int ammoCount; // @0x180 (word 0x60) rounds remaining
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Scalar feedTimer; // @0x184 (word 0x61) seconds left in current feed
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int ammoClassID; // @0x188 (word 0x62) entity class spawned per round
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int cookOffArmed; // @0x18C (word 0x63) cook-off timer running
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int cookOffTime; // @0x190 (word 0x64) game clock at which it detonates
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WatcherGaugeAlarm ammoAlarm; // @0x194 (0x54) 6-level feed alarm (level @0x1A8)
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// (WAVE 4) `int statusState` DELETED -- it was a this+0x40 SHADOW of the
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// inherited MechSubsystem::simulationState; the reads now use that base
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// member. The 0x54 ammoAlarm (was an 8-byte HeatAlarm) lands ammoModelFile
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// at 0x1E8 -- exact binary layout, locked by AmmoBinLayoutCheck.
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int ammoModelFile; // @0x1E8 (word 0x7A) round model index
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int explosionModelFile; // @0x1EC (word 0x7B) cook-off explosion model index
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// @0x1F0 (word 0x7C) cook-off heat-injection descriptor, inited by
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// FUN_0041db7c; CookOff() fills word 0x7D (@0x1F4) below with the total
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// heat (ammoCount * heatPerRound) before injecting via HeatableSubsystem.
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int cookOffHeatSource[1]; // @0x1F0 (word 0x7C)
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Scalar heatPerRound; // @0x1F4 (word 0x7D)
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int cookOffHeatRest[10]; // @0x1F8..0x21C (words 0x7E..0x87)
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int initialAmmoCount; // @0x220 (word 0x88) ammoCount captured at ctor
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Scalar feedRate; // @0x224 (word 0x89) resource FeedRate
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int reserved; // @0x228 (word 0x8A) init 0 (unused)
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};
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#endif
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