src/video/x11/SDL_x11touch.c
author Dimitris Zenios <dimitris.zenios@gmail.com>
Thu, 31 May 2012 13:37:02 +0300
changeset 6316 a89c79a3f0cd
parent 6138 4c64952a58fb
child 6348 049721824c2e
permissions -rwxr-xr-x
1.Moved all xinput2 functionality to its own file 2.Implement touch events using Xinput2.Leave evtouch as a fallback when xinput2 is not supported

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>

  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 "SDL_config.h"

#if SDL_VIDEO_DRIVER_X11

#include "SDL_x11video.h"
#include "SDL_x11touch.h"
#include "SDL_x11xinput2.h"
#include "../../events/SDL_touch_c.h"


#ifdef SDL_INPUT_LINUXEV
#include <linux/input.h>
#include <fcntl.h>
#endif

void
X11_InitTouch(_THIS)
{
    /*Initilized Xinput2 multitouch 
    * and return in order to not initialize
    * evtouch also*/
    if(X11_Xinput2IsMutitouchSupported()) {
        X11_InitXinput2Multitouch(_this);
        return;
    }
#ifdef SDL_INPUT_LINUXEV
    FILE *fd;
    fd = fopen("/proc/bus/input/devices","r");

    int i = 0;
    int tsfd;
    char line[256];
    char tstr[256];
    int vendor = -1,product = -1,event = -1;
    while(!feof(fd)) {
        if(fgets(line,256,fd) <=0) continue;
        if(line[0] == '\n') {
            if(vendor == 1386 || vendor==1) {
                sprintf(tstr,"/dev/input/event%i",event);

                tsfd = open( tstr, O_RDONLY | O_NONBLOCK );
                if ( tsfd == -1 )
                    continue;   /* Maybe not enough permissions ? */

                SDL_Touch touch;
                touch.pressure_max = 0;
                touch.pressure_min = 0;
                touch.id = event; 

                touch.driverdata = SDL_malloc(sizeof(EventTouchData));
                EventTouchData* data = (EventTouchData*)(touch.driverdata);

                data->x = -1;
                data->y = -1;
                data->pressure = -1;
                data->finger = 0;
                data->up = SDL_FALSE;
                data->down = SDL_FALSE;

                data->eventStream = tsfd;
                ioctl (data->eventStream, EVIOCGNAME (sizeof (tstr)), tstr);

                int abs[5];
                ioctl(data->eventStream,EVIOCGABS(0),abs);	
                touch.x_min = abs[1];
                touch.x_max = abs[2];
                touch.native_xres = touch.x_max - touch.x_min;
                ioctl(data->eventStream,EVIOCGABS(ABS_Y),abs);	
                touch.y_min = abs[1];
                touch.y_max = abs[2];
                touch.native_yres = touch.y_max - touch.y_min;
                ioctl(data->eventStream,EVIOCGABS(ABS_PRESSURE),abs);	
                touch.pressure_min = abs[1];
                touch.pressure_max = abs[2];
                touch.native_pressureres = touch.pressure_max - touch.pressure_min;

                SDL_AddTouch(&touch, tstr);
            }
            vendor = -1;
            product = -1;
            event = -1;      
        }
        else if(line[0] == 'I') {
            i = 1;
            while(line[i]) {
                sscanf(&line[i],"Vendor=%x",&vendor);
                sscanf(&line[i],"Product=%x",&product);
                i++;
            }
        }
        else if(line[0] == 'H') {
            i = 1;
            while(line[i]) {
                sscanf(&line[i],"event%d",&event);
                i++;
            }
        }
    }
    fclose(fd);
#endif
}

void
X11_QuitTouch(_THIS)
{
    SDL_TouchQuit();
}

#endif /* SDL_VIDEO_DRIVER_X11 */

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