src/video/x11/SDL_x11touch.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 31 Dec 2011 09:28:07 -0500
changeset 6138 4c64952a58fb
parent 5981 75caa8a7d559
child 6316 a89c79a3f0cd
permissions -rwxr-xr-x
Happy New Year!

/*
  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 "../../events/SDL_touch_c.h"


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

void
X11_InitTouch(_THIS)
{
#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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