Stubs out _cogl_xlib_handle_event

This stubs out an xlib event handling mechanism for Cogl. The intention
is for Clutter to use this to forward all x11 events to Cogl. As we move
winsys functionality down into Cogl, Cogl will become responsible for
handling a number of X events: ConfigureNotify events for onscreen
framebuffers, swap events and Damage events for cogl_x11_texture_pixmap.

clutter/cogl/cogl/Makefile.am

@@ -151,11 +151,13 @@ libclutter_cogl_la_SOURCES = $(BUILT_SOURCES) $(cogl_sources_c)
 
 if SUPPORT_GLX
 libclutter_cogl_la_SOURCES += \
-       $(srcdir)/winsys/cogl-glx.c
+       $(srcdir)/winsys/cogl-glx.c \
+       $(srcdir)/winsys/cogl-xlib.c
 endif
 if SUPPORT_EGL_PLATFORM_POWERVR_X11
 libclutter_cogl_la_SOURCES += \
-       $(srcdir)/winsys/cogl-eglx.c
+       $(srcdir)/winsys/cogl-eglx.c \
+       $(srcdir)/winsys/cogl-xlib.c
 endif
 if SUPPORT_EGL_PLATFORM_POWERVR_NULL
 libclutter_cogl_la_SOURCES += \

clutter/cogl/cogl/cogl-internal.h

@@ -27,6 +27,10 @@
 #include "cogl.h"
 #include "cogl-matrix-stack.h"
 
+#ifdef COGL_HAS_XLIB_SUPPORT
+#include <X11/Xlib.h>
+#endif
+
 typedef enum
 {
   COGL_FRONT_WINDING_CLOCKWISE,
@@ -128,4 +132,39 @@ _cogl_get_max_texture_image_units (void);
 void
 _cogl_flush_face_winding (void);
 
+#ifdef COGL_HAS_XLIB_SUPPORT
+
+/*
+ * CoglX11FilterReturn:
+ * @COGL_XLIB_FILTER_CONTINUE: The event was not handled, continues the
+ *                            processing
+ * @COGL_XLIB_FILTER_REMOVE: Remove the event, stops the processing
+ *
+ * Return values for the #CoglX11FilterFunc function.
+ */
+typedef enum _CoglXlibFilterReturn {
+  COGL_XLIB_FILTER_CONTINUE,
+  COGL_XLIB_FILTER_REMOVE
+} CoglXlibFilterReturn;
+
+/*
+ * cogl_xlib_handle_event:
+ * @xevent: pointer to XEvent structure
+ *
+ * This function processes a single X event; it can be used to hook
+ * into external X event retrieval (for example that done by Clutter
+ * or GDK).
+ *
+ * Return value: #CoglXlibFilterReturn. %COGL_XLIB_FILTER_REMOVE
+ * indicates that Cogl has internally handled the event and the
+ * caller should do no further processing. %COGL_XLIB_FILTER_CONTINUE
+ * indicates that Cogl is either not interested in the event,
+ * or has used the event to update internal state without taking
+ * any exclusive action.
+ */
+CoglXlibFilterReturn
+_cogl_xlib_handle_event (XEvent *xevent);
+
+#endif /* COGL_HAS_XLIB_SUPPORT */
+
 #endif /* __COGL_INTERNAL_H */

clutter/cogl/cogl/winsys/cogl-xlib.c

@@ -0,0 +1,54 @@
+/*
+ * Cogl
+ *
+ * An object oriented GL/GLES Abstraction/Utility Layer
+ *
+ * Copyright (C) 2010 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors:
+ *  Robert Bragg <robert@linux.intel.com>
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <cogl.h>
+#include <cogl-internal.h>
+#include <cogl-handle.h>
+#include <cogl-context.h>
+#include <cogl-framebuffer-private.h>
+
+#include <X11/Xlib.h>
+
+CoglXlibFilterReturn
+_cogl_xlib_handle_event (XEvent *xevent)
+{
+  _COGL_GET_CONTEXT (ctx, COGL_XLIB_FILTER_CONTINUE);
+
+  switch (xevent->type)
+    {
+      /* TODO... */
+    default:
+      break;
+    }
+
+  return COGL_XLIB_FILTER_CONTINUE;
+}
+