src/video/x11/SDL_x11touch.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 27 Sep 2011 23:15:01 -0400
changeset 5967 ae97a61f002f
parent 5966 2edecf22a2e7
child 5968 b229328c7ad4
permissions -rw-r--r--
============================================================

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2011 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");

  char c;
  int i = 0;
  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);

        int 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++;
      }
    }
  }

  close(fd);
#endif
}

void
X11_QuitTouch(_THIS)
{
    SDL_TouchQuit();
}

#endif /* SDL_VIDEO_DRIVER_X11 */

/* vi: set ts=4 sw=4 expandtab: */