CVirtualJoy.cc

#include "CVirtualJoy.h"
#include "buttons_ref.h"
#include "suinput.h"
#include <cstring>               //memset
#include <iostream>              //cout

static int static_deviceid = 0;  //Device incrementer

CVirtualJoy::CVirtualJoy(unsigned int _buttons, unsigned int _axes)
{
  deviceid = static_deviceid;

  //Get a device descriptor
  fd = suinput_open();
  if(fd<0)
    {
      std::cout << "ERROR " << fd << ": Failed opening virtual device " << deviceid << ".\n";
      return;
    }//if


  //Setup buttons for device
  if(_buttons>BUTTONS_SIZE) std::cout << "WARNING: Number of buttons (" << _buttons << ") for virtual device " << deviceid << " exceeds maximum allowable buttons which is " << (BUTTONS_SIZE - 1) << ".\n";
  for(unsigned int i=0; i<_buttons && i<BUTTONS_SIZE; i++)
    {
      if(suinput_enable_event(fd, EV_KEY, buttons_ref::BUTTONS[i])<0)
	{
	  std::cout << "ERROR: Failed enabling event for button " << i << " on virtual device << " << deviceid << ".\n";
	}//if
    }//if

  //Setup axes for device
	
  if(_axes>AXES_SIZE) std::cout << "WARNING: Number of axes (" << _axes << ") for virtual device " << deviceid << " exceeds maximum allowable axes which is " << (AXES_SIZE - 1) << ".\n";
  for(unsigned int i=0; i<_axes && i<AXES_SIZE; i++)
    {
      if(suinput_enable_event(fd, EV_ABS, buttons_ref::AXES[i])<0)
	{
	  std::cout << "ERROR: Failed enabling event for axis " << i << " on virtual device << " << deviceid << ".\n";
	}
    }//if
  axesData.resize(_axes, 0);

  //Create and initialize the device
  struct uinput_user_dev user_dev;
  memset(&user_dev, 0, sizeof(struct uinput_user_dev));
  std::string dName = "WeJoy Virtual Device " + std::to_string(deviceid);
  strcpy(user_dev.name, dName.c_str());

  for(unsigned int i=0; i<_axes && i<AXES_SIZE; i++) {
    user_dev.absmax[i]=32767;
    user_dev.absmin[i]=-32767;
  }

  user_dev.id.bustype = BUS_VIRTUAL;	//TODO Should we use BUS_VIRTUAL instead of BUS_USB?
  //user_dev.id.vendor = 0x06a3;
  //user_dev.id.product = 0x0764;
  user_dev.id.version = 1;
  int r = suinput_create(fd, &user_dev);
  if(r)
    {
      std::cout <<"ERROR " << r << ": Failed creating virtual device " << deviceid << ".\n";
      suinput_destroy(fd);
      fd = -1;
      return;
    }//if

  std::cout << "Successfully created virtual device " << deviceid << ".\n";
  static_deviceid++;
}


CVirtualJoy::~CVirtualJoy()
{
  suinput_destroy(fd);
}

bool CVirtualJoy::isOpen()
{
  return fd>=0;
}

int CVirtualJoy::getDeviceid()
{
  return deviceid;
}

int CVirtualJoy::get_button_status(int type)
{
  return (buttonFlags & (1ul << type) ? true : false);
}


void CVirtualJoy::send_button_event(int type, int value)
{
  uint64_t check = (value) ? (get_button_flags() | 1ul << type) : (get_button_flags() & ~(1uL << type)); //Set new button flags state
  if(check==get_button_flags()) return; //Button already set, we do not need to emit the data again
  set_button_flags(check);              //Updating button flags

  suinput_emit(fd, EV_KEY, buttons_ref::BUTTONS[type], value);
  suinput_syn(fd);
}

void CVirtualJoy::send_axis_event(int type, int value)
{
  set_axis_data(type, value);
  suinput_emit(fd, EV_ABS, buttons_ref::AXES[type], value);
  suinput_syn(fd);
}