Scoping out API
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106
src/jstick.cpp
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106
src/jstick.cpp
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#include <jstick.hpp>
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#include <linux/joystick.h>
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#include <cstddef>
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#include <cstdio>
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#include <format>
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#include <filesystem>
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#include <unistd.h>
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#include <bits/fs_fwd.h>
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int js_handle;
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bool js_connected;
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struct axis_state {
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short x, y;
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};
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/// Reads a joystick event from the joystick device.
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/// @returns 0 on success. Otherwise -1 is returned.
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int read_event(int fd, struct js_event *event) {
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ssize_t bytes;
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bytes = read(fd, event, sizeof(*event));
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if (bytes == sizeof(*event))
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return 0;
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/// Error, could not read full event.
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return -1;
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}
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bool jstick::JoystickDetected(int jsHandle) {
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return std::filesystem::exists(std::format("/dev/input/js{}", jsHandle));
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}
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int jstick::NumJoysticksDetected() {
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int max = 4;
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for (int i = 0; i < max; i++) {
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if (!JoystickDetected(i))
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return i;
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}
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return max;
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}
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void jstick::JoystickServiceUpdate() {
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bool has = JoystickDetected();
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}
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void ProcessButtonEvent(uint8_t button_index, bool value) {
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}
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void ProcessAxisEvent(uint8_t axis, short x, short y) {
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}
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/// Keeps track of the current axis state.
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/// @note This function assumes that axes are numbered starting from 0, and that
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/// the X axis is an even number, and the Y axis is an odd number. However, this
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/// is usually a safe assumption.
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/// @returns the axis that the event indicated.
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size_t get_axis_state(struct js_event *event, struct axis_state axes[3])
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{
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size_t axis = event->number / 2;
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if (axis < 3)
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{
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if (event->number % 2 == 0)
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axes[axis].x = event->value;
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else
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axes[axis].y = event->value;
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}
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return axis;
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}
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struct js_event event;
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struct axis_state axes[3] = {0};
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size_t axis;
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void jstick::ReadEventLoop() {
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while (read_event(js_handle, &event) == 0) {
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switch (event.type) {
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case JS_EVENT_BUTTON:
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ProcessButtonEvent(event.number, event.value ? true : false);
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break;
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case JS_EVENT_AXIS:
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axis = get_axis_state(&event, axes);
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if (axis < 3)
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ProcessAxisEvent(axis, axes[axis].x, axes[axis].y);
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break;
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case JS_EVENT_INIT:
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default:
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break;
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}
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fflush(stdout);
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}
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}
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