M4 Android stage 1 (gamepad). One controller forwarded as pad 0; mirrors the
Linux/Apple gamepad mapping (byte-identical GamepadButton/GamepadAxis events).
- crates/punktfunk-android: 2 JNI fns (nativeSendGamepadButton/Axis) building the
GamepadButton/GamepadAxis InputEvents (flags = pad index 0).
- clients/android: Gamepad.kt — BTN_*/AXIS_* wire constants, KEYCODE_*->BTN_* map, and
an AxisMapper (joystick MotionEvent -> sticks +-32767 +y-up / triggers 0..255 /
HAT->BTN_DPAD_* with on-change gating + release-all reset). MainActivity routes
gamepad-source KeyEvents in dispatchKeyEvent (DPAD only when from a gamepad, so
keyboard arrows still map to VK) and adds dispatchGenericMotionEvent for joystick axes.
Verified live (emulator -> gamescope host, `adb input gamepad keyevent`): host created
the virtual X-Box 360 uinput pad (index=0) and received the gamepad datagrams (input=22).
Axes can't be adb-injected (joystick MotionEvents) -- build/clippy + code-review this
increment; live stick/trigger test deferred to a physical controller. Deferred: device
enumeration/selection, controller-type negotiation, DualSense rich input.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
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