[xinput] Check for the XInput entry points

Apparently, the XInput extension is using the same pkg-config
file ('xi') for both the 1.x and the 2.x API, so we need to
check for both the 1.x XGetExtensionVersion and the 2.x
XQueryInputVersion.

clutter/x11/clutter-backend-x11.c

@@ -39,8 +39,13 @@
 #include "clutter-backend-x11.h"
 #include "clutter-stage-x11.h"
 #include "clutter-x11.h"
+
 #include <X11/extensions/Xcomposite.h>
 
+#ifdef HAVE_XINPUT
+#include <X11/extensions/XInput.h>
+#endif
+
 #include "../clutter-event.h"
 #include "../clutter-main.h"
 #include "../clutter-debug.h"
@@ -53,15 +58,18 @@ G_DEFINE_TYPE (ClutterBackendX11, clutter_backend_x11, CLUTTER_TYPE_BACKEND);
 struct _ClutterX11XInputDevice
 {
   ClutterInputDevice device;
-#ifdef USE_XINPUT
+
+#ifdef HAVE_XINPUT
   XDevice           *xdevice;
   XEventClass        xevent_list[5];   /* MAX 5 event types */
   int                num_events;
 #endif
-  ClutterX11InputDeviceType type; /* FIXME: generic to ClutterInputDevice? */
+
+  /* FIXME: generic to ClutterInputDevice? */
+  ClutterX11InputDeviceType type;
 };
 
-#ifdef USE_XINPUT
+#ifdef HAVE_XINPUT
 void  _clutter_x11_register_xinput ();
 #endif
 
@@ -185,7 +193,7 @@ clutter_backend_x11_post_parse (ClutterBackend  *backend,
 
       clutter_backend_set_resolution (backend, dpi);
 
-#ifdef USE_XINPUT
+#ifdef HAVE_XINPUT
       _clutter_x11_register_xinput ();
 #endif
 
@@ -630,7 +638,7 @@ clutter_x11_remove_filter (ClutterX11FilterFunc func,
     }
 }
 
-#ifdef USE_XINPUT
+#ifdef HAVE_XINPUT
 
 void
 _clutter_x11_register_xinput ()
@@ -669,7 +677,15 @@ _clutter_x11_register_xinput ()
 
   backend_singleton->have_xinput = TRUE;
 
+#ifdef HAVE_XGET_EXTENSION_VERSION
   ext = XGetExtensionVersion (backend_singleton->xdpy, INAME);
+#elif HAVE_XQUERY_INPUT_VERSION
+  ext = XQueryInputVersion (backend_singleton->xdpy, XI_2_Major, XI_2_Minor);
+#else
+  g_critical ("XInput does not have XGetExtensionVersion nor "
+              "XQueryInputVersion");
+  return;
+#endif
 
   if (!ext || (ext == (XExtensionVersion*) NoSuchExtension))
     {
@@ -879,7 +895,7 @@ clutter_x11_get_input_devices (void)
 {
   ClutterMainContext  *context;
 
-#ifdef USE_XINPUT
+#ifdef HAVE_XINPUT
   if (!backend_singleton)
     {
       g_critical ("X11 backend has not been initialised");
@@ -889,9 +905,9 @@ clutter_x11_get_input_devices (void)
   context = clutter_context_get_default ();
 
   return context->input_devices;
-#else
+#else /* !HAVE_XINPUT */
   return NULL;
-#endif
+#endif /* HAVE_XINPUT */
 }
 
 /**
@@ -923,7 +939,7 @@ clutter_x11_get_input_device_type (ClutterX11XInputDevice *device)
 gboolean
 clutter_x11_has_xinput (void)
 {
-#ifdef USE_XINPUT
+#ifdef HAVE_XINPUT
   if (!backend_singleton)
     {
       g_critical ("X11 backend has not been initialised");

clutter/x11/clutter-backend-x11.h

@@ -28,10 +28,6 @@
 #include <X11/Xlib.h>
 #include <X11/Xatom.h>
 
-#ifdef USE_XINPUT
-#include <X11/extensions/XInput.h>
-#endif
-
 #include "clutter-x11.h"
 
 G_BEGIN_DECLS
@@ -79,10 +75,8 @@ struct _ClutterBackendX11
   Atom atom_NET_WM_NAME;
   Atom atom_UTF8_STRING;
 
-#ifdef USE_XINPUT
   int event_types[CLUTTER_X11_XINPUT_LAST_EVENT];
   gboolean have_xinput;
-#endif
 
   Time last_event_time;
 };
@@ -127,7 +121,6 @@ XVisualInfo *
 clutter_backend_x11_get_visual_info (ClutterBackendX11 *backend_x11,
                                      gboolean           for_offscreen);
 
-#ifdef USE_XINPUT
 void 
 _clutter_x11_register_xinput (void);
 
@@ -136,7 +129,6 @@ _clutter_x11_unregister_xinput (void);
 
 ClutterX11XInputDevice *
 _clutter_x11_get_device_for_xid (XID id);
-#endif
 
 void
 _clutter_x11_select_events (Window xwin);

clutter/x11/clutter-event-x11.c

@@ -43,7 +43,7 @@
 
 #include <X11/Xatom.h>
 
-#ifdef USE_XINPUT
+#ifdef HAVE_XINPUT
 #include <X11/extensions/XInput.h>
 #endif
 
@@ -263,7 +263,7 @@ set_user_time (ClutterBackendX11 *backend_x11,
     }
 }
 
-#if 0 /* See XInput keyboard comment below USE_XINPUT */
+#if 0 /* See XInput keyboard comment below HAVE_XINPUT */
 static void
 convert_xdevicekey_to_xkey (XDeviceKeyEvent *xkev, XEvent *xevent)
 {
@@ -282,7 +282,7 @@ convert_xdevicekey_to_xkey (XDeviceKeyEvent *xkev, XEvent *xevent)
   xevent->xkey.keycode = xkev->keycode;
   xevent->xkey.same_screen = xkev->same_screen;
 }
-#endif /* USE_XINPUT */
+#endif /* HAVE_XINPUT */
 
 static void
 translate_key_event (ClutterBackend   *backend,
@@ -738,7 +738,7 @@ event_translate (ClutterBackend *backend,
         }
       else
         {  /* XInput fun.. Needs clean up. */
-#ifdef USE_XINPUT
+#ifdef HAVE_XINPUT
           int *ev_types = backend_x11->event_types;
 
           CLUTTER_NOTE (EVENT, "XInput event type: %d", xevent->type);

clutter/x11/clutter-stage-x11.h

@@ -62,10 +62,8 @@ struct _ClutterStageX11
   ClutterBackendX11 *backend;
   ClutterStageState  state;
 
-#ifdef USE_XINPUT
   int event_types[CLUTTER_X11_XINPUT_LAST_EVENT];
   GList *devices;
-#endif
 
   ClutterStage *wrapper;
 };

configure.ac

@@ -491,7 +491,38 @@ AS_IF([test "x$clutterbackend" = "xglx" || test "x$clutterbackend" = "xeglx"],
 
                 [yes],
                 [
-                  AC_DEFINE(USE_XINPUT, 1, Use the XINPUT X extension)
+                  AC_DEFINE(HAVE_XINPUT, 1, Use the XINPUT X extension)
+
+                  # ugh, this is insane
+                  AC_TRY_COMPILE([#include <X11/extensions/XInput.h>],
+                              [
+ XExtensionVersion *res;
+ res = XGetExtensionVersion (NULL, INAME);
+                              ],
+                              [have_xget_extension_version=yes],
+                              [have_xget_extension_version=no])
+
+                  AC_TRY_COMPILE([#include <X11/extensions/XInput.h>],
+                              [
+ XExtensionVersion *res;
+ res = XQueryInputVersion (NULL, XI_2_Major, XI_2_Minor);
+                              ],
+                              [have_xquery_input_version=yes],
+                              [have_xquery_input_version=no])
+
+                  AS_IF([test "x$have_xget_extension_version" = "xyes"],
+                        [
+                          AC_DEFINE([HAVE_XGET_EXTENSION_VERSION],
+                                    [1],
+                                    [Define to 1 if we have XGetExtensionVersion])
+                        ])
+
+                  AS_IF([test "x$have_xquery_input_version" = "xyes"],
+                        [
+                          AC_DEFINE([HAVE_XQUERY_INPUT_VERSION],
+                                    [1],
+                                    [Define to 1 if we have XQueryInputVersion])
+                        ])
 
                   X11_LIBS="$X11_LIBS -lXi"
                   X11_PC_FILES="$X11_PC_FILES xi"