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joystick_linux.cpp

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/*
        $Id: joystick_linux.cpp,v 1.1 2001/03/06 15:09:22 mbn Exp $

        ------------------------------------------------------------------------
        ClanLib, the platform independent game SDK.

        This library is distributed under the GNU LIBRARY GENERAL PUBLIC LICENSE
        version 2. See COPYING for details.

        For a total list of contributers see CREDITS.

        ------------------------------------------------------------------------
*/

#include "Core/precomp.h"

#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>

#include "API/Core/System/cl_assert.h"
#include <API/Display/Input/inputaxis.h>
#include <API/Display/Input/inputbutton.h>
#include <Display/Input/X11/joystick_linux.h>
#ifdef USE_JOY
#include "joystick_linux.h"

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0)

CL_LinuxJoystick::CL_LinuxJoystick()
{
        fd = -1;
        num_buttons = 0;
        num_axes = 0;
        axes = NULL;
        buttons = NULL;
}

CL_LinuxJoystick::~CL_LinuxJoystick()
{
        if (fd != -1)
        {
                close(fd);
        }
        
        delete[] axes;
        delete[] buttons;
}

bool CL_LinuxJoystick::init(int number)
{
        cl_assert(fd == -1); // do not call init twice!

        char devname[10];
        sprintf( devname, "/dev/js%d", number );
        fd = open( devname, O_RDONLY | O_NONBLOCK );
        if (fd == -1) return false; // no joystick available

        ioctl( fd, JSIOCGBUTTONS, &num_buttons );
        ioctl( fd, JSIOCGAXES, &num_axes );
/*
        cout << "Number of axes:     " << num_axes << endl;
        cout << "Number of buttons:  " << num_buttons << endl;
*/
        axes = new CL_LinuxJoystick_Axis[num_axes];
        buttons = new CL_LinuxJoystick_Button[num_buttons];

        return true;
}

void CL_LinuxJoystick::keep_alive()
{       
        cl_assert(fd != -1); // init _MUST_ be called before update!
        
        while (read( fd, &jev, sizeof(js_event) ) != -1)
        {
                switch (jev.type)
                {
                case JS_EVENT_AXIS:
                        axes[jev.number].set_value(jev.value);
                        break;

                case JS_EVENT_BUTTON:
                        buttons[jev.number].set_value(jev.value);
                        break;
                }
        }
}

CL_InputAxis *CL_LinuxJoystick::get_axis(int num)
{
        cl_assert(num >= 0); // disallow negative values

        if (num >= num_axes) return NULL;
        return &axes[num];
}

CL_InputButton *CL_LinuxJoystick::get_button(int num)
{
        cl_assert(num >= 0); // disallow negative values

        if (num >= num_buttons) return NULL;
        return &buttons[num];
}
#endif
#endif

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