src/video/x11/SDL_x11touch.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 08 Apr 2011 13:03:26 -0700
changeset 5535 96594ac5fd1a
parent 5481 22dfc3958dc3
child 5603 e1ca92e7f2ff
permissions -rw-r--r--
SDL 1.3 is now under the zlib license.

/*
  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){
	/*printf("Wacom... Assuming it is a touch device\n");*/
	/*sprintf(tstr,"/dev/input/event%i",event);*/
	/*printf("At location: %s\n",tstr);*/

	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->eventStream = open(tstr, 
				 O_RDONLY | O_NONBLOCK);
	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 */

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