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Combat: MISSILE SPLASH DAMAGE -- Explosion::SplashDamage reconstructed (task #62)

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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>
This commit is contained in:
arcattack
2026-07-13 19:06:24 -05:00
co-authored by Claude Opus 4.8
parent 4c54f7ef0c
commit 12fbc023a8
5 changed files with 282 additions and 4 deletions
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game/reconstructed/ammobin.cpp
+11
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@@ -185,6 +185,17 @@ int BTAmmoBinFeeding(void *bin)
return (bin != 0 && ((AmmoBin *)bin)->ammoAlarm.Level() == AmmoBin::Feeding) ? 1 : 0;
}
// The round's GameModel resource ID (ammoModelFile @0x1E8, word 0x7A). In the
// arcade the MissileLauncher seeds each spawned Missile's model from AmmoBin+0x1e8
// (part_013.c:8778) and the Missile ctor reads SplashRadius from that model's
// GameModel record +0x50 (part_013.c:10184). The port re-expresses missiles as
// local flying rounds, so BTResolveSplashRadius (mech4.cpp) walks THIS path to
// recover the authored blast radius. Complete-type read of the named member.
int BTAmmoRoundModelResource(void *bin)
{
return (bin != 0) ? ((AmmoBin *)bin)->ammoModelFile : 0;
}
int AmmoBin::FeedAmmo()
{
if (simulationState == 1) // this+0x40 == 1 (destroyed)