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Audio Phase 4c (AUDIO_FIDELITY F17/F19): impact scaling + the authored footstep feed

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F17 CollisionSpeed (binary id 24 @0x4B4): real member captured as
|worldLinearVelocity| when the contact accumulator arms (0->1) -- the authored
AttackVolume [0.9,1] / Brightness [0.7,1] scales over impact speed [0,25] now
make harder hits sound louder and brighter.  ReduceButton (id 46 @0x340): real
watchable member (the keyboard rig never presses it).  UnstablePercentage
stays deferred: its sway/overspeed model @0x3F0 is the known gyro-ledger gap
(live writer unexported); binding without the model would be a stand-in.

F19 footstep feed (the invention is dead, long live the authored chain):
new [motionscalecfg/motiontrigcfg] traces recovered the authored configs --
EVERY motion watcher extracts |linearMotion| (motionValue=3); the footstep
volume mixer is fed by LocalAcceleration [0,10] -> ctl100 (per-stride kick)
+ LocalVelocity [0,0.6] -> ctl101 (0.4 base while moving).  The port never
wrote Mover::localAcceleration, so ctl100 read 0 and the old mech2.cpp
step-intensity broadcast (patch-sniffing, invented curve) fought the live
authored scale.  Now: localAcceleration.linear = d(published velocity)/dt --
EXACTLY the binary's derivation ((avgVel - prev)/avgDt into +0x1e4,
part_012.c:15186-15195) -- and the broadcast is REMOVED.

Regression (30s, walk throttle): stable; footfalls deliver through the
wholly-authored chain with per-stride VARYING gains (0.61/0.72/0.62 -- real
step dynamics, impossible under the old constant-curve invention).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
arcattack
2026-07-16 14:11:36 -05:00
co-authored by Claude Opus 4.8
parent 21378ec132
commit 9dcb4752de
5 changed files with 57 additions and 69 deletions
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game/reconstructed/mech.cpp
+5 -2
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@@ -705,7 +705,7 @@ const Mech::IndexEntry
ATTRIBUTE_ENTRY(Mech, MaxAcceleration, attrPad), // 0x15
ATTRIBUTE_ENTRY(Mech, CollisionState, collisionState), // 0x16 real StateIndicator (audio impact/scrape watcher)
ATTRIBUTE_ENTRY(Mech, CollisionNormal, attrPad), // 0x17
ATTRIBUTE_ENTRY(Mech, CollisionSpeed, attrPad), // 0x18
ATTRIBUTE_ENTRY(Mech, CollisionSpeed, collisionSpeed), // 0x18 (F17: |impact velocity|, binary @0x4B4)
ATTRIBUTE_ENTRY(Mech, CollisionMaterialType, attrPad), // 0x19
ATTRIBUTE_ENTRY(Mech, CurrentSpeed, legCycleSpeed), // 0x1a (existing @0x348)
ATTRIBUTE_ENTRY(Mech, MaxRunSpeed, reverseStrideLength), // 0x1b (existing @0x34c = run/top speed)
@@ -727,7 +727,7 @@ const Mech::IndexEntry
ATTRIBUTE_ENTRY(Mech, TestButton4, attrPad), // 0x2b
ATTRIBUTE_ENTRY(Mech, TestButton5, attrPad), // 0x2c
ATTRIBUTE_ENTRY(Mech, TestButton6, attrPad), // 0x2d
ATTRIBUTE_ENTRY(Mech, ReduceButton, attrPad), // 0x2e
ATTRIBUTE_ENTRY(Mech, ReduceButton, reduceButton), // 0x2e (F17: cab REDUCE, binary @0x340)
ATTRIBUTE_ENTRY(Mech, RadarRange, radarRange), // 0x2f (radar scale)
ATTRIBUTE_ENTRY(Mech, RadarLinearPosition, radarLinearPosition), // 0x30 (Point3D* -> localOrigin)
ATTRIBUTE_ENTRY(Mech, RadarAngularPosition, radarAngularPosition),// 0x31 (Quaternion* -> localOrigin)
@@ -946,6 +946,9 @@ Mech::Mech(
distanceToMissile = FLT_MAX;
incomingLockNext = 0;
distanceToMissileNext = FLT_MAX;
// (F17) impact-speed scale + cab REDUCE button
collisionSpeed = 0.0f;
reduceButton = 0;
ZeroBlock(this + 0xca, 6); // this[0xca..0xcf] = 0
ZeroBlock(this + 0x153, 6); // this[0x153..0x158] = 0