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Audio Phase 4d (AUDIO_FIDELITY F5): footStep is the authored CONTACT LEVEL

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The binary's per-frame perf (disasm @0x4a9e80-0x4a9eb6 leg / @0x4aba86-
0x4abab9 body) computes footStep@0x394 = (jointlocal.y <= *footStepThreshold)
with the threshold pointer = SequenceController+0x20 = &ANI hdr[2] -- the
header word the engine's own AnimationInstance captures (JMOVER.cpp:1415)
and our SelectSequence skipped.  States 0/1 retain the value.

Port: SelectSequence captures hdr[2]; PerformAndWatch evaluates the contact
level per frame from the cached jointlocal root joint (leg channel drives
the pose); the 150 ms clip-transition pulse + decay are RETIRED (steps fired
at clip boundaries with a fixed width; clips whose root crosses twice or
never counted wrong).

Live verification (30s walk): the authored threshold decodes real
(-0.232 root height); rootY oscillates across it per stride (-0.26 contact /
-0.19 swing) with clean 0->1->0 transitions per leg state (5/6/7); 34
footfall deliveries at stride rate with per-stride varying gains.

Also closes F23(2): the 17 authored AnimationState trigger states fire
empirically -- the EngineShiftFwd/Rev heard during the gait dead-band hunt
WERE states 10/11/14/15; the runtime clip numbering is correct.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
arcattack
2026-07-16 14:16:14 -05:00
co-authored by Claude Opus 4.8
parent 9dcb4752de
commit 0e2401fb52
6 changed files with 62 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files
game/reconstructed/mech4.cpp
+24 -10
View File
@@ -5274,18 +5274,32 @@ void
// (AudioLogicalTrigger FootStep, AudioMotionScale/Trigger LocalVelocity, ...)
// never executed -- only the PUSHED StateIndicator watchers fired. That's
// why footsteps/motion-scaled sounds were silent while state sounds worked. [T0]
// FootStep pulse decay (see SetBodyAnimation): clear the contact flag ~150ms
// after the plant so the FootStep matcher (fires on the CHANGE to 1) sees a 0
// before the next stride re-pulses. Lives HERE (not IntegrateMotion, which the
// current gait path never calls) so it provably ticks every mech frame, right
// before the watcher poll below reads it. Time-based -- tick-rate immune.
if (footStepDecay > 0)
// (AUDIO_FIDELITY F5) footStep is the authored CONTACT LEVEL (binary
// disasm @0x4a9e80-0x4a9eb6): while the leg channel's gait state is not
// Standing(0)/1, footStep = (jointlocal.y <= *clip threshold); states
// 0/1 RETAIN the previous value. The FootStep matcher fires on the
// CHANGE to 1 -- one clean rising edge per actual foot plant, timed by
// the clip's authored root-height crossing (replaces the 150 ms
// transition pulse, which fired at clip boundaries with a fixed width).
if (legAnimationState != 0 && legAnimationState != 1)
{
footStepDecay -= (int)(dt * 1000.0f);
if (footStepDecay <= 0)
if (!footStepRootResolved)
{
footStepDecay = 0;
footStep = 0;
footStepRootResolved = 1;
footStepRootJoint = ResolveJoint("jointlocal");
}
Scalar *fs_thresh = legAnimation.footStepThreshold;
if (footStepRootJoint != 0 && fs_thresh != 0)
{
int contact =
(footStepRootJoint->GetTranslation().y <= *fs_thresh) ? 1 : 0;
if (getenv("BT_AUDIO_LOG")) { static int s_fc=0;
if (contact != footStep && s_fc++ < 40)
DEBUG_STREAM << "[audio] footstep contact " << footStep << "->" << contact
<< " rootY=" << footStepRootJoint->GetTranslation().y
<< " thresh=" << *fs_thresh << " legState=" << legAnimationState
<< "\n" << std::flush; }
footStep = contact;
}
}