Simon Gardling 1e8c294a80 forza-trigger: gate throttle on clutch state ...

User report: with the clutch in (pedal pressed, engine disconnected from
wheels), steering left still produced resistance on R2. The throttle
shouldn't have any feel when it's mechanically irrelevant.

RacingDSX's throttle resistance formula is
`avgAccel = sqrt(0.25*X^2 + 1.0*Z^2)`
derived from the accelerometer alone. It never checks clutch state, so
cornering G-forces keep producing trigger resistance even while the
clutch pedal is floored. Bug.

Fix: when Forza's clutch byte > 128 (clutch fully or mostly disengaged)
bypass the entire throttle path \u2014 slip detection and non-slip Feedback
both \u2014 and release the trigger. Uses the same one-shot 0x05 (active
retract) on transition + steady-state 0x00 (no-op) pattern as the
in-race \u2192 not-in-race transition (divergence #4) so we don't get the
trigger-motor whine from re-asserting 0x05 every frame.

Brake is unaffected: brake calipers operate independently of clutch
state, so ABS feel during clutch-in is still correct.

For auto-clutch users this also produces brief (~100 ms) trigger
relaxations during shifts \u2014 physically accurate (the engine *is*
momentarily disconnected during a shift) and matches the haptic feel of
a real manual transmission.

Documented as divergence #5 in the module docstring.

2026-05-03 00:35:49 -04:00

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