E:/Download/ois-1.0RC1/src/linux/EventHelpers.cpp

Go to the documentation of this file.

/*
The zlib/libpng License

Copyright (c) 2006 Phillip Castaneda (pjcast -- www.wreckedgames.com)

This software is provided 'as-is', without any express or implied warranty. In no event will
the authors be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial
applications, and to alter it and redistribute it freely, subject to the following
restrictions:

    1. The origin of this software must not be misrepresented; you must not claim that
                you wrote the original software. If you use this software in a product,
                an acknowledgment in the product documentation would be appreciated but is
                not required.

    2. Altered source versions must be plainly marked as such, and must not be
                misrepresented as being the original software.

    3. This notice may not be removed or altered from any source distribution.
*/
#include "linux/EventHelpers.h"
#include "linux/LinuxPrereqs.h"
#include "linux/LinuxForceFeedback.h"
#include "OISException.h"
#include "OISJoyStick.h"

#include <linux/input.h>

//#define OIS_LINUX_JOY_DEBUG

#ifdef OIS_LINUX_JOY_DEBUG
# include <iostream>
  using namespace std;
#endif

using namespace OIS;

struct DeviceComponentInfo
{
        std::vector<int> buttons, relAxes, absAxes, hats;
};

bool inline isBitSet(unsigned long bits[], unsigned int bit)
{
        return (bits[bit/(sizeof(long)*8)] >> ((bit)%(sizeof(long)*8))) & 1;
}
//-----------------------------------------------------------------------------//
DeviceComponentInfo getComponentInfo( int deviceID )
{
        unsigned long info[2][((KEY_MAX-1)/(sizeof(long)*8)) +1];
        memset( info, 0, sizeof(info) );

        DeviceComponentInfo components;

        //Read "all" (hence 0) components of the device - read into first entry
        ioctl(deviceID, EVIOCGBIT(0, EV_MAX), info[0]);

        for (int i = 0; i < EV_MAX; i++)
        {
                if( isBitSet(info[0], i) )
                {
                        memset( info[1], 0, sizeof(info) / 2 );
                        ioctl(deviceID, EVIOCGBIT(i, KEY_MAX), info[1]);
                        for (int j = 0; j < KEY_MAX; j++)
                        {
                                if( isBitSet(info[1], j) )
                                {
                                        if(i == EV_ABS)
                                        {
                                                //input_absinfo abInfo;
                                                //ioctl( fd, EVIOCGABS(j), abInfo );
                                                if( j >= ABS_HAT0X && j <= ABS_HAT3Y )
                                                {
                                                        components.hats.push_back(j);
                                                }
                                                else
                                                {
                                                        components.absAxes.push_back(j);
                                                        //input_absinfo absinfo;
                                                        //ioctl(deviceID, EVIOCGABS(j), &absinfo);
                                                        //We cannot actually change these values :|
                                                        //absinfo.minimum = JoyStick::MIN_AXIS;
                                                        //absinfo.maximum = JoyStick::MAX_AXIS;
                                                        //ioctl(deviceID, EVIOCSABS(j), &absinfo);
                                                }
                                        }
                                        else if(i == EV_REL)
                                        {
                                                components.relAxes.push_back(j);
                                        }
                                        else if(i == EV_KEY)
                                        {
                                                components.buttons.push_back(j);
                                        }
                                }
                        }
                }
        }

        return components;
}

//-----------------------------------------------------------------------------//
bool EventUtils::isJoyStick( int deviceID, JoyStickInfo &js )
{
        if( deviceID == -1 ) OIS_EXCEPT( E_General, "Error with File Descriptor" );

        DeviceComponentInfo info = getComponentInfo( deviceID );

        int buttons = 0;
        bool joyButtonFound = false;
        js.button_map.clear();

        #ifdef OIS_LINUX_JOY_DEBUG
          cout << "\n\nDisplaying ButtonMapping Status:";
        #endif
        for(std::vector<int>::iterator i = info.buttons.begin(), e = info.buttons.end(); i != e; ++i )
        {
                //Check to ensure we find at least one joy only button
                if( (*i >= BTN_JOYSTICK && *i <= BTN_THUMBR) || (*i >= BTN_WHEEL && *i <= BTN_GEAR_UP ) )
                        joyButtonFound = true;

                js.button_map[*i] = buttons++;

                #ifdef OIS_LINUX_JOY_DEBUG
                  cout << "\nButton Mapping ID (hex): " << hex << *i << " OIS Button Num: " << dec << (buttons-1);
                #endif
        }

        //Joy Buttons found, so it must be a joystick or pad
        if( joyButtonFound )
        {
                js.joyFileD = deviceID;
                js.vendor = getName(deviceID);
                js.buttons = buttons;
                js.axes = info.relAxes.size() + info.absAxes.size();
                js.hats = info.hats.size();

                //Map the Axes
                #ifdef OIS_LINUX_JOY_DEBUG
                  cout << "\n\nDisplaying AxisMapping Status:";
                #endif
                int axes = 0;
                for(std::vector<int>::iterator i = info.absAxes.begin(), e = info.absAxes.end(); i != e; ++i )
                {
                        js.axis_map[*i] = axes;

                        input_absinfo absinfo;
                        ioctl(deviceID, EVIOCGABS(*i), &absinfo);
                        js.axis_range[axes] = Range(absinfo.minimum, absinfo.maximum);

                        #ifdef OIS_LINUX_JOY_DEBUG
                          cout << "\nAxis Mapping ID (hex): " << hex << *i << " OIS Axis Num: " << dec << axes;
                        #endif

                        ++axes;
                }
        }

        return joyButtonFound;
}

//-----------------------------------------------------------------------------//
std::string EventUtils::getName( int deviceID )
{
        char name[OIS_DEVICE_NAME];
        ioctl(deviceID, EVIOCGNAME(OIS_DEVICE_NAME), name);
        return std::string(name);
}

//-----------------------------------------------------------------------------//
void EventUtils::enumerateForceFeedback( int deviceID, LinuxForceFeedback** ff )
{
        //Linux Event to OIS Event Mappings
        std::map<int, Effect::EType> typeMap;
        typeMap[FF_CONSTANT] = Effect::Constant;
        typeMap[FF_RAMP]     = Effect::Ramp;
        typeMap[FF_SPRING]   = Effect::Spring;
        typeMap[FF_FRICTION] = Effect::Friction;
        typeMap[FF_SQUARE]   = Effect::Square;
        typeMap[FF_TRIANGLE] = Effect::Triangle;
        typeMap[FF_SINE]     = Effect::Sine;
        typeMap[FF_SAW_UP]   = Effect::SawToothUp;
        typeMap[FF_SAW_DOWN] = Effect::SawToothDown;
        typeMap[FF_DAMPER]   = Effect::Damper;
        typeMap[FF_INERTIA]  = Effect::Inertia;
        typeMap[FF_CUSTOM]   = Effect::Custom;

        std::map<int, Effect::EForce> forceMap;
        forceMap[FF_CONSTANT] = Effect::ConstantForce;
        forceMap[FF_RAMP] = Effect::RampForce;
        forceMap[FF_PERIODIC] = Effect::PeriodicForce;
        forceMap[FF_CUSTOM] = Effect::CustomForce;

        //Remove any previously existing memory and create fresh
        removeForceFeedback( ff );
        *ff = new LinuxForceFeedback();

        unsigned long info[4] = {0,0,0,0};
        unsigned long subinfo[4]= {0,0,0,0};

        //Read overall force feedback components of the device
        ioctl(deviceID, EVIOCGBIT(EV_FF, sizeof(long)*4), info);

        //FF Axes
        //if( isBitSet(info, ABS_X) ) //X Axis
        //if( isBitSet(info, ABS_Y) ) //Y Axis
        //if( isBitSet(info, ABS_WHEEL) ) //Wheel

        //FF Effects
        for( int effect = ABS_WHEEL+1; effect < FF_MAX; effect++ )
        {
                if(isBitSet(info, effect))
                {
                        //std::cout << "\tEffect Type: " << effect << std::endl;
                        memset(subinfo, 0, sizeof(subinfo));
                        //Read any info about this supported effect
                        ioctl(deviceID, EVIOCGBIT(effect, sizeof(long)*4), subinfo);
                        for( int force = 0; force < FF_MAX; force++ )
                        {
                                if(isBitSet(subinfo, force))
                                        (*ff)->_addEffectTypes( forceMap[force], typeMap[effect] );
                        }
                }
        }

        //Check to see if any effects were added, else destroy the pointer
        const ForceFeedback::SupportedEffectList &list = (*ff)->getSupportedEffects();
        if( list.size() == 0 )
                removeForceFeedback( ff );
}

//-----------------------------------------------------------------------------//
void EventUtils::removeForceFeedback( LinuxForceFeedback** ff )
{
        delete *ff;
        *ff = 0;
}

---