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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168#ifndef AC_INPUT_H#define AC_INPUT_H
#include <linux/input.h>#ifdef USE_WAYLAND#include <wayland-client.h>#endif
#define MAX_INPUT_DEVICES 24#define MAX_HIDRAW_DEVICES 4#define MAX_EVENTS_PER_FRAME 64
// NuPhy Air60 HE vendor ID#define NUPHY_VENDOR_ID 0x19f5
// AC event typestypedef enum { AC_EVENT_NONE = 0, AC_EVENT_KEYBOARD_DOWN, AC_EVENT_KEYBOARD_UP, AC_EVENT_TOUCH, AC_EVENT_DRAW, AC_EVENT_LIFT, AC_EVENT_REFRAMED,} ACEventType;
typedef struct { ACEventType type; int x, y; // Pointer coordinates int key_code; // Linux key code char key_name[32]; // AC key name ("a", "space", "arrowup", etc.) int repeat; // Key repeat flag float pressure; // 0.0-1.0 analog pressure (1.0 = full press, NuPhy HE)} ACEvent;
// Per-key analog pressure state (for NuPhy HE)#define MAX_ANALOG_KEYS 128typedef struct { int active; // Is this key currently pressed via analog? int releasing; // Set when raw_pressure==0, release decay active float pressure; // Current smoothed pressure 0.0-1.0 float target; // Last raw pressure target (NuPhy stops sending when stable) float raw_accum; // Accumulated raw pressure this poll (for averaging) int raw_count; // Number of HID reports this poll cycle int key_code; // Linux keycode equivalent} ACAnalogKey;
// One live finger on the multitouch surface. Slots follow the kernel's// MT-B protocol: a driver addresses a slot with ABS_MT_SLOT, then hands it// a tracking id that persists for the whole life of that contact.#define MAX_TOUCH_SLOTS 10
// Contact-area value treated as a full-force strike when a pad reports area// instead of pressure. Synaptics and Elan pads land a firm fingertip around// 700-900 in ABS_MT_TOUCH_MAJOR units; 800 puts a normal hit near the top of// the range without clipping every strike to 1.0.#define TOUCH_MAJOR_FULL 800
typedef struct { int tracking_id; // -1 when the slot holds no finger int raw_x, raw_y; // most recent absolute position, device units int have_pos; // a position has arrived since touch-down float x, y; // normalized across the pad, 0..1, y down float pressure; // 0..1 from ABS_MT_PRESSURE, else contact area, 0 if neither int have_pressure; // 1 once ABS_MT_PRESSURE arrived, so area stops overriding double down_at; // monotonic seconds at touch-down} ACTouchSlot;
// The absolute surface we track whole contacts on — a laptop trackpad.// Geometry comes from EVIOCGABS, so normalized coordinates and `aspect`// describe the real pad instead of a guess. Only one surface is tracked;// a laptop has one, and the pointer already assumed as much.typedef struct { int fd_index; // evdev slot that owns the surface, -1 = none int has_slots; // driver speaks MT-B (ABS_MT_SLOT exists) int x_min, x_max, y_min, y_max; int x_res, y_res; // units per mm, 0 when the driver stays quiet float aspect; // pad width / height, 1 when resolution is unknown int slot; // slot that ABS_MT_* fields currently address int contacts; // live contacts as of the last SYN_REPORT int generation; // bumped whenever a SYN_REPORT changes the contacts unsigned id_hash; // hash of the live tracking ids, so a same-count // finger swap still counts as a change int primary_id; // tracking id driving the pointer, -1 = none int primary_x, primary_y; // that contact's position at the last report ACTouchSlot slots[MAX_TOUCH_SLOTS];} ACTouchSurface;
typedef struct { int fds[MAX_INPUT_DEVICES]; int fd_is_analog[MAX_INPUT_DEVICES]; // Set if this evdev belongs to an analog keyboard int count; int pointer_x, pointer_y; int pointer_down; int delta_x, delta_y; // Per-frame pointer delta
// Trackpad absolute→relative conversion (BCM5974 etc.) int abs_prev_x, abs_prev_y; // Previous absolute position (INT_MIN = not set) int abs_x_min, abs_x_max; // Axis ranges from EVIOCGABS int abs_y_min, abs_y_max; int abs_x_res, abs_y_res; // Resolution (units/mm), 0 = unknown int fd_is_trackpad[MAX_INPUT_DEVICES]; // This evdev is an abs trackpad
// Whole-hand contacts on the trackpad, kept alongside the pointer so a // piece can play the pad as a surface while the cursor still works. ACTouchSurface surface;
// HID raw devices (for analog keyboards like NuPhy HE) int hidraw_fds[MAX_HIDRAW_DEVICES]; int hidraw_count;
// Per-key analog pressure tracking ACAnalogKey analog_keys[MAX_ANALOG_KEYS]; int has_analog; // Set if an analog keyboard is detected int hotplug_counter; // Polls since last hidraw scan double last_poll_time; // Monotonic time of last poll (seconds) int evdev_rescan_done; // Set after late evdev rescan int evdev_rescan_counter; // Frame counter for late rescan
// Event queue for current frame ACEvent events[MAX_EVENTS_PER_FRAME]; int event_count;
// Screen dimensions for touch scaling int screen_w, screen_h; int scale; // Display-to-piece scale factor (e.g. 3)
// Tablet mode (lid folded back on convertible laptops) int tablet_mode; // 0 = laptop, 1 = tablet (from EV_SW or sysfs)
#ifdef USE_WAYLAND // Wayland input state int is_wayland; // 1 if using Wayland input instead of evdev void *wayland_display; // ACWaylandDisplay* — for event dispatch // Key repeat state (Wayland doesn't send EV_KEY value=2) int repeat_rate; // keys per second (from compositor) int repeat_delay; // ms before repeat starts int repeat_key; // currently repeating key (-1 if none) double repeat_next; // monotonic time of next repeat event double repeat_start; // when repeat was armed#endif} ACInput;
ACInput *input_init(int screen_w, int screen_h, int scale);void input_poll(ACInput *input);void input_destroy(ACInput *input);
#ifdef USE_WAYLAND// Initialize Wayland input — binds keyboard/pointer/touch from seat// Call after wayland_display_init() returns successfullystruct ACWaylandDisplay;ACInput *input_init_wayland(void *wayland_display, int screen_w, int screen_h, int scale);#endif
// Map Linux keycode to AC key nameconst char *input_key_name(int code);
// Copy the live trackpad contacts into `out` (normalized 0..1, y down),// newest slot order. Returns how many were written, 0 when there is no// surface or no finger on it.int input_touch_contacts(const ACInput *input, ACTouchSlot *out, int max);
// Pad width / height as a ratio of real millimeters — 1.0 when the driver// reports no resolution. The membrane's boundary math needs the true shape.float input_touch_aspect(const ACInput *input);
#endif