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x11_xinput2.c
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x11_xinput2.c
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/*
* Support for the X11 XInput extension.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#include "manymouse.h"
/* Try to use this on everything but Windows and Mac OS by default... */
#ifndef SUPPORT_XINPUT2
#if ( (defined(_WIN32) || defined(__CYGWIN__)) )
#define SUPPORT_XINPUT2 0
#elif ( (defined(__MACH__)) && (defined(__APPLE__)) )
#define SUPPORT_XINPUT2 0
#else
#define SUPPORT_XINPUT2 1
#endif
#endif
#if SUPPORT_XINPUT2
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <X11/extensions/XInput2.h>
/* 32 is good enough for now. */
#define MAX_MICE 32
#define MAX_AXIS 16
typedef struct
{
int device_id;
int connected;
int relative[MAX_AXIS];
int minval[MAX_AXIS];
int maxval[MAX_AXIS];
char name[64];
} MouseStruct;
static MouseStruct mice[MAX_MICE];
static unsigned int available_mice = 0;
static Display *display = NULL;
static int xi2_opcode = 0;
/* !!! FIXME: this is cut-and-paste between a few targets now. Move it to
* !!! FIXME: manymouse.c ...
*/
/*
* Just trying to avoid malloc() here...we statically allocate a buffer
* for events and treat it as a ring buffer.
*/
/* !!! FIXME: tweak this? */
#define MAX_EVENTS 1024
static ManyMouseEvent input_events[MAX_EVENTS];
static volatile int input_events_read = 0;
static volatile int input_events_write = 0;
static void queue_event(const ManyMouseEvent *event)
{
/* copy the event info. We'll process it in ManyMouse_PollEvent(). */
memcpy(&input_events[input_events_write], event, sizeof (ManyMouseEvent));
input_events_write = ((input_events_write + 1) % MAX_EVENTS);
/* Ring buffer full? Lose oldest event. */
if (input_events_write == input_events_read)
{
/* !!! FIXME: we need to not lose mouse buttons here. */
input_events_read = ((input_events_read + 1) % MAX_EVENTS);
} /* if */
} /* queue_event */
static int dequeue_event(ManyMouseEvent *event)
{
if (input_events_read != input_events_write) /* no events if equal. */
{
memcpy(event, &input_events[input_events_read], sizeof (*event));
input_events_read = ((input_events_read + 1) % MAX_EVENTS);
return 1;
} /* if */
return 0; /* no event. */
} /* dequeue_event */
/*
* You _probably_ have Xlib on your system if you're on a Unix box where you
* are planning to plug in multiple mice. That being said, we don't want
* to force a project to add Xlib to their builds, or force the end-user to
* have Xlib installed if they are otherwise running a console app that the
* evdev driver would handle.
*
* We load all Xlib symbols at runtime, and fail gracefully if they aren't
* available for some reason...ManyMouse might be able to use the evdev
* driver or at least return a zero.
*
* On Linux (and probably others), you'll need to add -ldl to your link line,
* but it's part of glibc, so this is pretty much going to be there.
*/
static void *libx11 = NULL;
static void *libxext = NULL;
static void *libxi = NULL;
typedef int (*XExtErrHandler)(Display *, _Xconst char *, _Xconst char *);
static XExtErrHandler (*pXSetExtensionErrorHandler)(XExtErrHandler h) = 0;
static Display* (*pXOpenDisplay)(_Xconst char*) = 0;
static int (*pXCloseDisplay)(Display*) = 0;
static int (*pXISelectEvents)(Display*,Window,XIEventMask*,int) = 0;
static Bool (*pXQueryExtension)(Display*,_Xconst char*,int*,int*,int*) = 0;
static Status (*pXIQueryVersion)(Display*,int*,int*) = 0;
static XIDeviceInfo* (*pXIQueryDevice)(Display*,int,int*) = 0;
static void (*pXIFreeDeviceInfo)(XIDeviceInfo*) = 0;
static Bool (*pXGetEventData)(Display*,XGenericEventCookie*) = 0;
static void (*pXFreeEventData)(Display*,XGenericEventCookie*) = 0;
static int (*pXNextEvent)(Display*,XEvent*) = 0;
static int (*pXPending)(Display*) = 0;
static int (*pXFlush)(Display*) = 0;
static int (*pXEventsQueued)(Display*,int) = 0;
static int symlookup(void *dll, void **addr, const char *sym)
{
*addr = dlsym(dll, sym);
if (*addr == NULL)
return 0;
return 1;
} /* symlookup */
static int find_api_symbols(void)
{
void *dll = NULL;
#define LOOKUP(x) { if (!symlookup(dll, (void **) &p##x, #x)) return 0; }
dll = libx11 = dlopen("libX11.so.6", RTLD_GLOBAL | RTLD_LAZY);
if (dll == NULL)
return 0;
LOOKUP(XOpenDisplay);
LOOKUP(XCloseDisplay);
LOOKUP(XGetEventData);
LOOKUP(XFreeEventData);
LOOKUP(XQueryExtension);
LOOKUP(XNextEvent);
LOOKUP(XPending);
LOOKUP(XFlush);
LOOKUP(XEventsQueued);
dll = libxext = dlopen("libXext.so.6", RTLD_GLOBAL | RTLD_LAZY);
if (dll == NULL)
return 0;
LOOKUP(XSetExtensionErrorHandler);
dll = libxi = dlopen("libXi.so.6", RTLD_GLOBAL | RTLD_LAZY);
if (dll == NULL)
return 0;
LOOKUP(XISelectEvents);
LOOKUP(XIQueryVersion);
LOOKUP(XIQueryDevice);
LOOKUP(XIFreeDeviceInfo);
#undef LOOKUP
return 1;
} /* find_api_symbols */
static void xinput2_cleanup(void)
{
if (display != NULL)
{
pXCloseDisplay(display);
display = NULL;
} /* if */
memset(mice, '\0', sizeof (mice));
available_mice = 0;
#define LIBCLOSE(lib) { if (lib != NULL) { dlclose(lib); lib = NULL; } }
LIBCLOSE(libxi);
LIBCLOSE(libxext);
LIBCLOSE(libx11);
#undef LIBCLOSE
memset(input_events, '\0', sizeof (input_events));
input_events_read = input_events_write = 0;
} /* xinput2_cleanup */
static int init_mouse(MouseStruct *mouse, const XIDeviceInfo *devinfo)
{
XIAnyClassInfo **classes = devinfo->classes;
int axis = 0;
int i = 0;
/*
* we only look at "slave" devices. "Master" pointers are the logical
* cursors, "slave" pointers are the hardware that back them.
* "Floating slaves" are hardware that don't back a cursor.
*/
if ((devinfo->use != XISlavePointer) && (devinfo->use != XIFloatingSlave))
return 0; /* not a device we care about. */
else if (strstr(devinfo->name, "XTEST pointer") != NULL)
return 0; /* skip this nonsense. It's for the XTEST extension. */
mouse->device_id = devinfo->deviceid;
mouse->connected = 1;
for (i = 0; i < devinfo->num_classes; i++)
{
if ((classes[i]->type == XIValuatorClass) && (axis < MAX_AXIS))
{
const XIValuatorClassInfo *v = (XIValuatorClassInfo*) classes[i];
mouse->relative[axis] = (v->mode == XIModeRelative);
mouse->minval[axis] = (int) v->min;
mouse->maxval[axis] = (int) v->max;
axis++;
} /* if */
} /* for */
strncpy(mouse->name, devinfo->name, sizeof (mouse->name));
mouse->name[sizeof (mouse->name) - 1] = '\0';
return 1;
} /* init_mouse */
static int (*Xext_handler)(Display *, _Xconst char *, _Xconst char *) = NULL;
static int xext_errhandler(Display *d, _Xconst char *ext, _Xconst char *reason)
{
/* prevent Xlib spew to stderr for missing extensions. */
return (strcmp(reason, "missing") == 0) ? 0 : Xext_handler(d, ext, reason);
} /* xext_errhandler */
static int register_for_events(Display *dpy)
{
XIEventMask evmask;
unsigned char mask[3] = { 0, 0, 0 };
XISetMask(mask, XI_HierarchyChanged);
XISetMask(mask, XI_RawMotion);
XISetMask(mask, XI_RawButtonPress);
XISetMask(mask, XI_RawButtonRelease);
evmask.deviceid = XIAllDevices;
evmask.mask_len = sizeof (mask);
evmask.mask = mask;
/* !!! FIXME: retval? */
pXISelectEvents(dpy, DefaultRootWindow(dpy), &evmask, 1);
return 1;
} /* register_for_events */
static int x11_xinput2_init_internal(void)
{
const char *ext = "XInputExtension";
XIDeviceInfo *device_list = NULL;
int device_count = 0;
int available = 0;
int event = 0;
int error = 0;
int major = 2;
int minor = 0;
int i = 0;
xinput2_cleanup(); /* just in case... */
if (getenv("MANYMOUSE_NO_XINPUT2") != NULL)
return -1;
if (!find_api_symbols())
return -1; /* couldn't find all needed symbols. */
display = pXOpenDisplay(NULL);
if (display == NULL)
return -1; /* no X server at all */
Xext_handler = pXSetExtensionErrorHandler(xext_errhandler);
available = (pXQueryExtension(display, ext, &xi2_opcode, &event, &error) &&
(pXIQueryVersion(display, &major, &minor) != BadRequest));
pXSetExtensionErrorHandler(Xext_handler);
Xext_handler = NULL;
if (!available)
return -1; /* no XInput2 support. */
/*
* Register for events first, to prevent a race where we unplug a
* device between when we queried for the list and when we start
* listening for changes.
*/
if (!register_for_events(display))
return -1;
device_list = pXIQueryDevice(display, XIAllDevices, &device_count);
for (i = 0; i < device_count; i++)
{
MouseStruct *mouse = &mice[available_mice];
if (init_mouse(mouse, &device_list[i]))
available_mice++;
} /* for */
pXIFreeDeviceInfo(device_list);
return available_mice;
} /* x11_xinput2_init_internal */
static int x11_xinput2_init(void)
{
int retval = x11_xinput2_init_internal();
if (retval < 0)
xinput2_cleanup();
return retval;
} /* x11_xinput2_init */
static void x11_xinput2_quit(void)
{
xinput2_cleanup();
} /* x11_xinput2_quit */
static const char *x11_xinput2_name(unsigned int index)
{
return (index < available_mice) ? mice[index].name : NULL;
} /* x11_xinput2_name */
static int find_mouse_by_devid(const int devid)
{
int i;
const MouseStruct *mouse = mice;
for (i = 0; i < available_mice; i++, mouse++)
{
if (mouse->device_id == devid)
return (mouse->connected) ? i : -1;
} /* for */
return -1;
} /* find_mouse_by_devid */
static int get_next_x11_event(XEvent *xev)
{
int available = 0;
pXFlush(display);
if (pXEventsQueued(display, QueuedAlready))
available = 1;
else
{
/* XPending() blocks if there's no data, so select() first. */
struct timeval nowait;
const int fd = ConnectionNumber(display);
fd_set fdset;
FD_ZERO(&fdset);
FD_SET(fd, &fdset);
memset(&nowait, '\0', sizeof (nowait));
if (select(fd+1, &fdset, NULL, NULL, &nowait) == 1)
available = pXPending(display);
} /* else */
if (available)
{
memset(xev, '\0', sizeof (*xev));
pXNextEvent(display, xev);
return 1;
} /* if */
return 0;
} /* get_next_x11_event */
/* Everything else returns left (0), right (1), middle (2)...XI2 returns
right and middle in reverse, so swap them ourselves. */
static inline int map_xi2_button(const int button)
{
if (button == 2)
return 3;
else if (button == 3)
return 2;
return button;
} /* map_xi2_button */
static void pump_events(void)
{
ManyMouseEvent event;
const int opcode = xi2_opcode;
const XIRawEvent *rawev = NULL;
const XIHierarchyEvent *hierev = NULL;
int mouse = 0;
XEvent xev;
int i = 0;
while (get_next_x11_event(&xev))
{
/* All XI2 events are "cookie" events...which need extra tapdance. */
if (xev.xcookie.type != GenericEvent)
continue;
else if (xev.xcookie.extension != opcode)
continue;
else if (!pXGetEventData(display, &xev.xcookie))
continue;
switch (xev.xcookie.evtype)
{
case XI_RawMotion:
rawev = (const XIRawEvent *) xev.xcookie.data;
mouse = find_mouse_by_devid(rawev->deviceid);
if (mouse != -1)
{
const double *values = rawev->raw_values;
int top = rawev->valuators.mask_len * 8;
if (top > MAX_AXIS)
top = MAX_AXIS;
for (i = 0; i < top; i++)
{
if (XIMaskIsSet(rawev->valuators.mask, i))
{
const int value = (int) *values;
if (mice[mouse].relative[i])
event.type = MANYMOUSE_EVENT_RELMOTION;
else
event.type = MANYMOUSE_EVENT_ABSMOTION;
event.device = mouse;
event.item = i;
event.value = value;
event.minval = mice[mouse].minval[i];
event.maxval = mice[mouse].maxval[i];
if ((!mice[mouse].relative[i]) || (value))
queue_event(&event);
values++;
} /* if */
} /* for */
} /* if */
break;
case XI_RawButtonPress:
case XI_RawButtonRelease:
rawev = (const XIRawEvent *) xev.xcookie.data;
mouse = find_mouse_by_devid(rawev->deviceid);
if (mouse != -1)
{
const int button = map_xi2_button(rawev->detail);
const int pressed = (xev.xcookie.evtype==XI_RawButtonPress);
/* gah, XInput2 still maps the wheel to buttons. */
if ((button >= 4) && (button <= 7))
{
if (pressed) /* ignore "up" for these "buttons" */
{
event.type = MANYMOUSE_EVENT_SCROLL;
event.device = mouse;
if ((button == 4) || (button == 5))
event.item = 0;
else
event.item = 1;
if ((button == 4) || (button == 6))
event.value = 1;
else
event.value = -1;
queue_event(&event);
} /* if */
} /* if */
else
{
event.type = MANYMOUSE_EVENT_BUTTON;
event.device = mouse;
event.item = button-1;
event.value = pressed;
queue_event(&event);
} /* else */
} /* if */
break;
case XI_HierarchyChanged:
hierev = (const XIHierarchyEvent *) xev.xcookie.data;
for (i = 0; i < hierev->num_info; i++)
{
if (hierev->info[i].flags & XISlaveRemoved)
{
mouse = find_mouse_by_devid(hierev->info[i].deviceid);
if (mouse != -1)
{
mice[mouse].connected = 0;
event.type = MANYMOUSE_EVENT_DISCONNECT;
event.device = mouse;
queue_event(&event);
} /* if */
} /* if */
} /* for */
break;
} /* switch */
pXFreeEventData(display, &xev.xcookie);
} /* while */
} /* pump_events */
static int x11_xinput2_poll(ManyMouseEvent *event)
{
if (dequeue_event(event)) /* ...favor existing events in the queue... */
return 1;
pump_events(); /* pump runloop for new hardware events... */
return dequeue_event(event); /* see if anything had shown up... */
} /* x11_xinput2_poll */
static const ManyMouseDriver ManyMouseDriver_interface =
{
"X11 XInput2 extension",
x11_xinput2_init,
x11_xinput2_quit,
x11_xinput2_name,
x11_xinput2_poll
};
const ManyMouseDriver *ManyMouseDriver_xinput2 = &ManyMouseDriver_interface;
#else
const ManyMouseDriver *ManyMouseDriver_xinput2 = 0;
#endif /* SUPPORT_XINPUT2 blocker */
/* end of x11_xinput2.c ... */