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#include "../include/GlobalHotkeysJoystick.hpp"
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/eventfd.h>
namespace gsr {
static constexpr double double_click_timeout_seconds = 0.33;
// Returns -1 on error
static int get_js_dev_input_id_from_filepath(const char *dev_input_filepath) {
if(strncmp(dev_input_filepath, "/dev/input/js", 13) != 0)
return -1;
int dev_input_id = -1;
if(sscanf(dev_input_filepath + 13, "%d", &dev_input_id) == 1)
return dev_input_id;
return -1;
}
GlobalHotkeysJoystick::~GlobalHotkeysJoystick() {
if(event_fd > 0) {
const uint64_t exit = 1;
write(event_fd, &exit, sizeof(exit));
}
if(read_thread.joinable())
read_thread.join();
if(event_fd > 0)
close(event_fd);
for(int i = 0; i < num_poll_fd; ++i) {
close(poll_fd[i].fd);
}
}
bool GlobalHotkeysJoystick::start() {
if(num_poll_fd > 0)
return false;
event_fd = eventfd(0, 0);
if(event_fd <= 0)
return false;
event_index = num_poll_fd;
poll_fd[num_poll_fd] = {
event_fd,
POLLIN,
0
};
extra_data[num_poll_fd] = {
-1
};
++num_poll_fd;
if(!hotplug.start()) {
fprintf(stderr, "Warning: failed to setup hotplugging\n");
} else {
hotplug_poll_index = num_poll_fd;
poll_fd[num_poll_fd] = {
hotplug.steal_fd(),
POLLIN,
0
};
extra_data[num_poll_fd] = {
-1
};
++num_poll_fd;
}
char dev_input_path[128];
for(int i = 0; i < 8; ++i) {
snprintf(dev_input_path, sizeof(dev_input_path), "/dev/input/js%d", i);
add_device(dev_input_path, false);
}
if(num_poll_fd == 0)
fprintf(stderr, "Info: no joysticks found, assuming they might be connected later\n");
read_thread = std::thread(&GlobalHotkeysJoystick::read_events, this);
return true;
}
bool GlobalHotkeysJoystick::bind_action(const std::string &id, GlobalHotkeyCallback callback) {
return bound_actions_by_id.insert(std::make_pair(id, std::move(callback))).second;
}
void GlobalHotkeysJoystick::poll_events() {
if(num_poll_fd == 0)
return;
if(save_replay) {
save_replay = false;
auto it = bound_actions_by_id.find("save_replay");
if(it != bound_actions_by_id.end())
it->second("save_replay");
}
}
void GlobalHotkeysJoystick::read_events() {
js_event event;
while(poll(poll_fd, num_poll_fd, -1) > 0) {
for(int i = 0; i < num_poll_fd; ++i) {
if(poll_fd[i].revents & (POLLHUP|POLLERR|POLLNVAL)) {
if(i == event_index)
goto done;
if(remove_poll_fd(i))
--i; // This item was removed so we want to repeat the same index to continue to the next item
continue;
}
if(!(poll_fd[i].revents & POLLIN))
continue;
if(i == event_index) {
goto done;
} else if(i == hotplug_poll_index) {
hotplug.process_event_data(poll_fd[i].fd, [&](HotplugAction hotplug_action, const char *devname) {
char dev_input_filepath[1024];
snprintf(dev_input_filepath, sizeof(dev_input_filepath), "/dev/%s", devname);
switch(hotplug_action) {
case HotplugAction::ADD: {
// Cant open the /dev/input device immediately or it fails.
// TODO: Remove this hack when a better solution is found.
usleep(50 * 1000);
add_device(dev_input_filepath);
break;
}
case HotplugAction::REMOVE: {
if(remove_device(dev_input_filepath))
--i; // This item was removed so we want to repeat the same index to continue to the next item
break;
}
}
});
} else {
process_js_event(poll_fd[i].fd, event);
}
}
}
done:
;
}
void GlobalHotkeysJoystick::process_js_event(int fd, js_event &event) {
if(read(fd, &event, sizeof(event)) != sizeof(event))
return;
if((event.type & JS_EVENT_BUTTON) == 0)
return;
if(event.number == 8 && event.value == 1) {
++num_times_clicked;
if(num_times_clicked == 1)
double_click_clock.restart();
else if(num_times_clicked == 2 && double_click_clock.restart() >= double_click_timeout_seconds)
num_times_clicked = 0;
if(num_times_clicked == 2) {
save_replay = true;
num_times_clicked = 0;
}
}
}
bool GlobalHotkeysJoystick::add_device(const char *dev_input_filepath, bool print_error) {
if(num_poll_fd >= max_js_poll_fd) {
fprintf(stderr, "Warning: failed to add joystick device %s, too many joysticks have been added\n", dev_input_filepath);
return false;
}
const int dev_input_id = get_js_dev_input_id_from_filepath(dev_input_filepath);
if(dev_input_id == -1)
return false;
const int fd = open(dev_input_filepath, O_RDONLY);
if(fd <= 0) {
if(print_error)
fprintf(stderr, "Error: failed to add joystick %s, error: %s\n", dev_input_filepath, strerror(errno));
return false;
}
poll_fd[num_poll_fd] = {
fd,
POLLIN,
0
};
extra_data[num_poll_fd] = {
dev_input_id
};
++num_poll_fd;
fprintf(stderr, "Info: added joystick: %s\n", dev_input_filepath);
return true;
}
bool GlobalHotkeysJoystick::remove_device(const char *dev_input_filepath) {
const int dev_input_id = get_js_dev_input_id_from_filepath(dev_input_filepath);
if(dev_input_id == -1)
return false;
const int poll_fd_index = get_poll_fd_index_by_dev_input_id(dev_input_id);
if(poll_fd_index == -1)
return false;
fprintf(stderr, "Info: removed joystick: %s\n", dev_input_filepath);
return remove_poll_fd(poll_fd_index);
}
bool GlobalHotkeysJoystick::remove_poll_fd(int index) {
if(index < 0 || index >= num_poll_fd)
return false;
close(poll_fd[index].fd);
for(int i = index + 1; i < num_poll_fd; ++i) {
poll_fd[i - 1] = poll_fd[i];
extra_data[i - 1] = extra_data[i];
}
--num_poll_fd;
return true;
}
int GlobalHotkeysJoystick::get_poll_fd_index_by_dev_input_id(int dev_input_id) const {
for(int i = 0; i < num_poll_fd; ++i) {
if(dev_input_id == extra_data[i].dev_input_id)
return i;
}
return -1;
}
}
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