egl: Unify the eglx and eglnative backends

Without actually consolidating the two backends this patch brings their
code within a cats whisker of each other in preparation for
consolidation.

clutter/eglnative/clutter-backend-egl.c

@@ -1,3 +1,30 @@
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+
+ * Authors:
+ *  Matthew Allum
+ *  Emmanuele Bassi
+ *  Robert Bragg
+ *  Neil Roberts
+ */
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -5,21 +32,28 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <unistd.h>
 
 #include <errno.h>
 
 #include "clutter-backend-egl.h"
 #include "clutter-stage-egl.h"
+#include "clutter-egl.h"
 
 #include "../clutter-private.h"
 #include "../clutter-main.h"
 #include "../clutter-debug.h"
+#include "../clutter-version.h"
 
 static ClutterBackendEGL *backend_singleton = NULL;
 
 static const gchar *clutter_fb_device = NULL;
 
+#ifdef COGL_HAS_X11_SUPPORT
+G_DEFINE_TYPE (ClutterBackendEGL, clutter_backend_egl, CLUTTER_TYPE_BACKEND_X11);
+#else
 G_DEFINE_TYPE (ClutterBackendEGL, clutter_backend_egl, CLUTTER_TYPE_BACKEND);
+#endif
 
 static void
 clutter_backend_at_exit (void)
@@ -33,6 +67,13 @@ clutter_backend_egl_pre_parse (ClutterBackend  *backend,
                                GError         **error)
 {
   const gchar *env_string;
+#ifdef COGL_HAS_X11_SUPPORT
+  ClutterBackendClass *backend_x11_class =
+    CLUTTER_BACKEND_CLASS (clutter_backend_egl_parent_class);
+
+  if (!backend_x11_class->pre_parse (backend, error))
+    return FALSE;
+#endif
 
   env_string = g_getenv ("CLUTTER_FB_DEVICE");
   if (env_string != NULL && env_string[0] != '\0')
@@ -45,14 +86,34 @@ static gboolean
 clutter_backend_egl_post_parse (ClutterBackend  *backend,
                                 GError         **error)
 {
-  ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL(backend);
+  ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
+#ifdef COGL_HAS_X11_SUPPORT
+  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
+  ClutterBackendClass *backend_x11_class =
+    CLUTTER_BACKEND_CLASS (clutter_backend_egl_parent_class);
+#endif
   EGLBoolean status;
 
+#ifdef COGL_HAS_X11_SUPPORT
+  if (!backend_x11_class->post_parse (backend, error))
+    return FALSE;
+
+#ifndef COGL_HAS_XLIB_SUPPORT
+#error "Clutter's EGL on X11 support currently only works with xlib Displays"
+#endif
+  backend_egl->edpy =
+    eglGetDisplay ((NativeDisplayType) backend_x11->xdpy);
+
+  status = eglInitialize (backend_egl->edpy,
+                          &backend_egl->egl_version_major,
+                          &backend_egl->egl_version_minor);
+#else
   backend_egl->edpy = eglGetDisplay (EGL_DEFAULT_DISPLAY);
 
   status = eglInitialize (backend_egl->edpy,
 			  &backend_egl->egl_version_major,
 			  &backend_egl->egl_version_minor);
+#endif
 
   g_atexit (clutter_backend_at_exit);
 
@@ -71,82 +132,162 @@ clutter_backend_egl_post_parse (ClutterBackend  *backend,
   return TRUE;
 }
 
-static void
-clutter_backend_egl_ensure_context (ClutterBackend *backend,
-                                    ClutterStage   *stage)
-{
-  /* not doing anything since we only have one context and
-   * it is permanently made current
-   */
-}
-
 static gboolean
 clutter_backend_egl_create_context (ClutterBackend  *backend,
                                     GError         **error)
 {
   ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
-  EGLConfig configs[2];
+#ifdef COGL_HAS_X11_SUPPORT
-  EGLint config_count;
+  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
+#endif
+  EGLConfig          config;
+  EGLint             config_count = 0;
   EGLBoolean         status;
   EGLint             cfg_attribs[] = {
-    EGL_BUFFER_SIZE,     EGL_DONT_CARE,
+    /* NB: This must be the first attribute, since we may
-    EGL_RED_SIZE,        5,
+     * try and fallback to no stencil buffer */
-    EGL_GREEN_SIZE,      6,
-    EGL_BLUE_SIZE,       5,
-    EGL_DEPTH_SIZE,      16,
-    EGL_ALPHA_SIZE,      EGL_DONT_CARE,
     EGL_STENCIL_SIZE,    2,
-#ifdef HAVE_COGL_GLES2
+
+    EGL_RED_SIZE,        1,
+    EGL_GREEN_SIZE,      1,
+    EGL_BLUE_SIZE,       1,
+    EGL_ALPHA_SIZE,      EGL_DONT_CARE,
+
+    EGL_DEPTH_SIZE,      1,
+
+    EGL_BUFFER_SIZE,     EGL_DONT_CARE,
+
+#if defined (HAVE_COGL_GLES2)
     EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
-#else /* HAVE_COGL_GLES2 */
+#else
+    EGL_RENDERABLE_TYPE, EGL_OPENGL_ES_BIT,
+#endif
+
     EGL_SURFACE_TYPE,    EGL_WINDOW_BIT,
-#endif /* HAVE_COGL_GLES2 */
+
     EGL_NONE
   };
+  EGLDisplay edpy;
+  gint retry_cookie = 0;
+  const char *error_message = NULL;
+#ifdef COGL_HAS_XLIB_SUPPORT
+  XVisualInfo *xvisinfo;
+  XSetWindowAttributes attrs;
+#endif
 
-  if (backend_egl->egl_context)
+  if (backend_egl->egl_context != EGL_NO_CONTEXT)
     return TRUE;
 
-  status = eglGetConfigs (backend_egl->edpy,
+  edpy = clutter_egl_display ();
-                          configs,
-                          2,
-                          &config_count);
 
-  if (status != EGL_TRUE)
+/* XXX: we should get rid of this goto yukkyness, there is a fail:
+ * goto at the end and this retry: goto at the top, but we should just
+ * have a try_create_context() function and call it in a loop that
+ * tries a different fallback each iteration */
+retry:
+  /* Here we can change the attributes depending on the fallback count... */
+
+  /* Some GLES hardware can't support a stencil buffer: */
+  if (retry_cookie == 1)
     {
-      g_set_error (error, CLUTTER_INIT_ERROR,
+      g_warning ("Trying with stencil buffer disabled...");
-                   CLUTTER_INIT_ERROR_BACKEND,
+      cfg_attribs[1 /* EGL_STENCIL_SIZE */] = 0;
-                   "No EGL configurations found");
-      return FALSE;
     }
 
-  status = eglChooseConfig (backend_egl->edpy,
+  /* XXX: at this point we only have one fallback */
+
+  status = eglChooseConfig (edpy,
                             cfg_attribs,
-                            configs,
+                            &config, 1,
-                            G_N_ELEMENTS (configs),
                             &config_count);
-
+  if (status != EGL_TRUE || config_count == 0)
-  if (status != EGL_TRUE)
     {
-      g_set_error (error, CLUTTER_INIT_ERROR,
+      error_message = "Unable to select a valid EGL configuration";
-                   CLUTTER_INIT_ERROR_BACKEND,
+      goto fail;
-                   "Unable to select a valid EGL configuration");
+    }
+
+  if (backend_egl->egl_context == EGL_NO_CONTEXT)
+    {
+#ifdef HAVE_COGL_GLES2
+      static const EGLint attribs[] =
+        { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
+
+      backend_egl->egl_context = eglCreateContext (edpy,
+                                                   config,
+                                                   EGL_NO_CONTEXT,
+                                                   attribs);
+
+#else
+      backend_egl->egl_context = eglCreateContext (edpy,
+                                                   config,
+                                                   EGL_NO_CONTEXT,
+                                                   NULL);
+
+#endif
+      if (backend_egl->egl_context == EGL_NO_CONTEXT)
+        {
+          error_message = "Unable to create a suitable EGL context";
+          goto fail;
+        }
+
+#ifdef COGL_HAS_XLIB_SUPPORT
+      backend_egl->egl_config = config;
+#endif
+      CLUTTER_NOTE (GL, "Created EGL Context");
+    }
+
+#ifdef COGL_HAS_XLIB_SUPPORT
+  /* COGL assumes that there is always a GL context selected; in order
+   * to make sure that an EGL context exists and is made current, we use
+   * a dummy, offscreen override-redirect window to which we can always
+   * fall back if no stage is available */
+
+  xvisinfo = clutter_backend_x11_get_visual_info (backend_x11);
+  if (xvisinfo == NULL)
+    {
+      g_critical ("Unable to find suitable GL visual.");
       return FALSE;
     }
 
-  CLUTTER_NOTE (BACKEND, "Got %i configs", config_count);
+  attrs.override_redirect = True;
+  attrs.colormap = XCreateColormap (backend_x11->xdpy,
+                                    backend_x11->xwin_root,
+                                    xvisinfo->visual,
+                                    AllocNone);
+  attrs.border_pixel = 0;
 
-  if (G_UNLIKELY (backend_egl->egl_surface != EGL_NO_SURFACE))
+  backend_egl->dummy_xwin = XCreateWindow (backend_x11->xdpy,
+                                           backend_x11->xwin_root,
+                                           -100, -100, 1, 1,
+                                           0,
+                                           xvisinfo->depth,
+                                           CopyFromParent,
+                                           xvisinfo->visual,
+                                           CWOverrideRedirect |
+                                           CWColormap |
+                                           CWBorderPixel,
+                                           &attrs);
+
+  XFree (xvisinfo);
+
+  backend_egl->dummy_surface =
+    eglCreateWindowSurface (edpy,
+                            backend_egl->egl_config,
+                            (NativeWindowType) backend_egl->dummy_xwin,
+                            NULL);
+
+  if (backend_egl->dummy_surface == EGL_NO_SURFACE)
     {
-      eglDestroySurface (backend_egl->edpy, backend_egl->egl_surface);
+      g_critical ("Unable to create an EGL surface");
-      backend_egl->egl_surface = EGL_NO_SURFACE;
+      return FALSE;
     }
 
-   if (G_UNLIKELY (backend_egl->egl_context != NULL))
+  eglMakeCurrent (edpy,
-     {
+                  backend_egl->dummy_surface,
-       eglDestroyContext (backend_egl->edpy, backend_egl->egl_context);
+                  backend_egl->dummy_surface,
-       backend_egl->egl_context = NULL;
+                  backend_egl->egl_context);
-     }
+
+#else /* COGL_HAS_XLIB_SUPPORT */
 
   if (clutter_fb_device != NULL)
     {
@@ -168,17 +309,17 @@ clutter_backend_egl_create_context (ClutterBackend  *backend,
         backend_egl->fb_device_id = fd;
 
       backend_egl->egl_surface =
-        eglCreateWindowSurface (backend_egl->edpy,
+        eglCreateWindowSurface (edpy,
-                                configs[0],
+                                config,
                                 (NativeWindowType) backend_egl->fb_device_id,
                                 NULL);
     }
   else
     {
       backend_egl->egl_surface =
-        eglCreateWindowSurface (backend_egl->edpy,
+        eglCreateWindowSurface (edpy,
-                                configs[0],
+                                config,
-                                NULL,
+                                (NativeWindowType) NULL,
                                 NULL);
     }
 
@@ -191,42 +332,13 @@ clutter_backend_egl_create_context (ClutterBackend  *backend,
       return FALSE;
     }
 
-#ifdef HAVE_COGL_GLES2
-  {
-    static const EGLint attribs[3] = {
-      EGL_CONTEXT_CLIENT_VERSION, 2,
-      EGL_NONE
-    };
-
-    backend_egl->egl_context = eglCreateContext (backend_egl->edpy,
-                                                 configs[0],
-                                                 EGL_NO_CONTEXT,
-                                                 attribs);
-  }
-#else
-  /* Seems some GLES implementations 1.x do not like attribs... */
-  backend_egl->egl_context = eglCreateContext (backend_egl->edpy,
-                                               configs[0],
-                                               EGL_NO_CONTEXT,
-                                               NULL);
-#endif
-
-  if (backend_egl->egl_context == EGL_NO_CONTEXT)
-    {
-      g_set_error (error, CLUTTER_INIT_ERROR,
-                   CLUTTER_INIT_ERROR_BACKEND,
-                   "Unable to create a suitable EGL context");
-      return FALSE;
-    }
-
-  CLUTTER_NOTE (GL, "Created EGL Context");
-
   CLUTTER_NOTE (BACKEND, "Setting context");
 
-  /* eglnative can have only one stage, so we store the EGL surface
+  /* Without X we assume we can have only one stage, so we
-   * in the backend itself, instead of the StageWindow implementation,
+   * store the EGL surface in the backend itself, instead
-   * and we make it current immediately to make sure the Cogl and
+   * of the StageWindow implementation, and we make it
-   * Clutter can query the EGL context for features.
+   * current immediately to make sure the Cogl and Clutter
+   * can query the EGL context for features.
    */
   status = eglMakeCurrent (backend_egl->edpy,
                            backend_egl->egl_surface,
@@ -247,70 +359,127 @@ clutter_backend_egl_create_context (ClutterBackend  *backend,
                 backend_egl->surface_width,
                 backend_egl->surface_height);
 
+#endif /* COGL_HAS_XLIB_SUPPORT */
+
   return TRUE;
+
+fail:
+
+  /* NB: We currently only support a single fallback option */
+  if (retry_cookie == 0)
+    {
+      retry_cookie = 1;
+      goto retry;
+    }
+
+  g_set_error (error, CLUTTER_INIT_ERROR,
+               CLUTTER_INIT_ERROR_BACKEND,
+               "%s", error_message);
+
+  return FALSE;
+}
+
+static void
+clutter_backend_egl_ensure_context (ClutterBackend *backend,
+                                    ClutterStage   *stage)
+{
+#ifndef COGL_HAS_XLIB_SUPPORT
+  /* Without X we only have one EGL surface to worry about
+   * so we can assume it is permanently made current and
+   * don't have to do anything here. */
+#else
+  ClutterBackendEGL  *backend_egl = CLUTTER_BACKEND_EGL (backend);
+  ClutterStageWindow *impl;
+
+  if (stage == NULL ||
+      (CLUTTER_PRIVATE_FLAGS (stage) & CLUTTER_ACTOR_IN_DESTRUCTION) ||
+      ((impl = _clutter_stage_get_window (stage)) == NULL))
+    {
+      CLUTTER_NOTE (BACKEND, "Clearing EGL context");
+      eglMakeCurrent (backend_egl->edpy,
+                      EGL_NO_SURFACE,
+                      EGL_NO_SURFACE,
+                      EGL_NO_CONTEXT);
+    }
+  else
+    {
+      ClutterStageEGL    *stage_egl;
+      ClutterStageX11    *stage_x11;
+
+      g_assert (impl != NULL);
+
+      CLUTTER_NOTE (MULTISTAGE, "Setting context for stage of type %s [%p]",
+                    g_type_name (G_OBJECT_TYPE (impl)),
+                    impl);
+
+      stage_egl = CLUTTER_STAGE_EGL (impl);
+      stage_x11 = CLUTTER_STAGE_X11 (impl);
+
+      if (backend_egl->egl_context == EGL_NO_CONTEXT)
+        return;
+
+      clutter_x11_trap_x_errors ();
+
+      /* we might get here inside the final dispose cycle, so we
+       * need to handle this gracefully
+       */
+      if (stage_x11->xwin == None ||
+          stage_egl->egl_surface == EGL_NO_SURFACE)
+        {
+          CLUTTER_NOTE (MULTISTAGE,
+                        "Received a stale stage, clearing all context");
+
+          if (backend_egl->dummy_surface == EGL_NO_SURFACE)
+            eglMakeCurrent (backend_egl->edpy,
+                            EGL_NO_SURFACE,
+                            EGL_NO_SURFACE,
+                            EGL_NO_CONTEXT);
+          else
+            eglMakeCurrent (backend_egl->edpy,
+                            backend_egl->dummy_surface,
+                            backend_egl->dummy_surface,
+                            backend_egl->egl_context);
+        }
+      else
+        {
+          CLUTTER_NOTE (MULTISTAGE, "Setting real surface current");
+          eglMakeCurrent (backend_egl->edpy,
+                          stage_egl->egl_surface,
+                          stage_egl->egl_surface,
+                          backend_egl->egl_context);
+        }
+
+      if (clutter_x11_untrap_x_errors ())
+        g_critical ("Unable to make the stage window 0x%x the current "
+                    "EGLX drawable",
+                    (int) stage_x11->xwin);
+    }
+#endif /* COGL_HAS_XLIB_SUPPORT */
 }
 
 static void
 clutter_backend_egl_redraw (ClutterBackend *backend,
                             ClutterStage   *stage)
 {
-  ClutterBackendEGL  *backend_egl = CLUTTER_BACKEND_EGL (backend);
-  ClutterStageEGL    *stage_egl;
   ClutterStageWindow *impl;
 
   impl = _clutter_stage_get_window (stage);
-  if (impl == NULL)
+  if (!impl)
     return;
 
   g_assert (CLUTTER_IS_STAGE_EGL (impl));
-  stage_egl = CLUTTER_STAGE_EGL (impl);
 
-  eglWaitNative (EGL_CORE_NATIVE_ENGINE);
+  clutter_stage_egl_redraw (CLUTTER_STAGE_EGL (impl), stage);
-  clutter_actor_paint (CLUTTER_ACTOR (stage_egl->wrapper));
-  cogl_flush ();
-
-  eglWaitGL();
-  eglSwapBuffers (backend_egl->edpy,  backend_egl->egl_surface);
-}
-
-static ClutterStageWindow *
-clutter_backend_egl_create_stage (ClutterBackend  *backend,
-                                  ClutterStage    *wrapper,
-                                  GError         **error)
-{
-  ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
-  ClutterStageEGL *stage_egl;
-  ClutterStageWindow *stage;
-
-  if (G_UNLIKELY (backend_egl->stage != NULL))
-    {
-      g_set_error (error, CLUTTER_INIT_ERROR,
-                   CLUTTER_INIT_ERROR_BACKEND,
-                   "The EGL native backend does not support multiple stages");
-      return backend_egl->stage;
-    }
-
-  stage = g_object_new (CLUTTER_TYPE_STAGE_EGL, NULL);
-
-  stage_egl = CLUTTER_STAGE_EGL (stage);
-  stage_egl->backend = backend_egl;
-  stage_egl->wrapper = wrapper;
-
-  backend_egl->stage = stage;
-
-  return stage;
 }
 
+#ifdef HAVE_TSLIB
 static void
 clutter_backend_egl_init_events (ClutterBackend *backend)
 {
+  /* XXX: This should be renamed to _clutter_events_tslib_init */
   _clutter_events_egl_init (CLUTTER_BACKEND_EGL (backend));
 }
-
+#endif
-static const GOptionEntry entries[] =
-{
-  { NULL }
-};
 
 static void
 clutter_backend_egl_finalize (GObject *gobject)
@@ -325,29 +494,59 @@ static void
 clutter_backend_egl_dispose (GObject *gobject)
 {
   ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (gobject);
+#ifdef COGL_HAS_X11_SUPPORT
+  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (gobject);
+#else
   ClutterStageEGL   *stage_egl = CLUTTER_STAGE_EGL (backend_egl->stage);
+#endif
 
+  /* We chain up before disposing our own resources so that
+     ClutterBackendX11 will destroy all of the stages before we
+     destroy the egl context. Otherwise the actors may try to make GL
+     calls during destruction which causes a crash */
+  G_OBJECT_CLASS (clutter_backend_egl_parent_class)->dispose (gobject);
+
+#ifdef HAVE_TSLIB
+  /* XXX: This should be renamed to _clutter_events_tslib_uninit */
   _clutter_events_egl_uninit (backend_egl);
+#endif
 
-  if (backend_egl->stage != NULL)
+#ifdef COGL_HAS_XLIB_SUPPORT
+  if (backend_egl->dummy_surface != EGL_NO_SURFACE)
     {
-      clutter_actor_destroy (CLUTTER_ACTOR (stage_egl->wrapper));
+      eglDestroySurface (backend_egl->edpy, backend_egl->dummy_surface);
-      backend_egl->stage = NULL;
+      backend_egl->dummy_surface = EGL_NO_SURFACE;
     }
 
+  if (backend_egl->dummy_xwin)
+    {
+      XDestroyWindow (backend_x11->xdpy, backend_egl->dummy_xwin);
+      backend_egl->dummy_xwin = None;
+    }
+
+#else /* COGL_HAS_XLIB_SUPPORT */
+
   if (backend_egl->egl_surface != EGL_NO_SURFACE)
     {
       eglDestroySurface (backend_egl->edpy, backend_egl->egl_surface);
       backend_egl->egl_surface = EGL_NO_SURFACE;
     }
 
+  if (backend_egl->stage != NULL)
+    {
+      clutter_actor_destroy (CLUTTER_ACTOR (stage_egl->wrapper));
+      backend_egl->stage = NULL;
+    }
+
   if (backend_egl->fb_device_id != -1)
     {
       close (backend_egl->fb_device_id);
       backend_egl->fb_device_id = -1;
     }
 
-  if (backend_egl->egl_context != NULL)
+#endif /* COGL_HAS_XLIB_SUPPORT */
+
+  if (backend_egl->egl_context)
     {
       eglDestroyContext (backend_egl->edpy, backend_egl->egl_context);
       backend_egl->egl_context = NULL;
@@ -359,13 +558,13 @@ clutter_backend_egl_dispose (GObject *gobject)
       backend_egl->edpy = 0;
     }
 
+#ifdef HAVE_TSLIB
   if (backend_egl->event_timer != NULL)
     {
       g_timer_destroy (backend_egl->event_timer);
       backend_egl->event_timer = NULL;
     }
-
+#endif
-  G_OBJECT_CLASS (clutter_backend_egl_parent_class)->dispose (gobject);
 }
 
 static GObject *
@@ -396,9 +595,17 @@ static ClutterFeatureFlags
 clutter_backend_egl_get_features (ClutterBackend *backend)
 {
   ClutterBackendEGL  *backend_egl = CLUTTER_BACKEND_EGL (backend);
+  ClutterFeatureFlags flags;
 
   g_assert (backend_egl->egl_context != NULL);
 
+#ifdef COGL_HAS_XLIB_SUPPORT
+  flags = clutter_backend_x11_get_features (backend);
+  flags |= CLUTTER_FEATURE_STAGE_MULTIPLE;
+#else
+  flags = CLUTTER_FEATURE_STAGE_STATIC;
+#endif
+
   CLUTTER_NOTE (BACKEND, "Checking features\n"
                 "GL_VENDOR: %s\n"
                 "GL_RENDERER: %s\n"
@@ -413,14 +620,120 @@ clutter_backend_egl_get_features (ClutterBackend *backend)
                 eglQueryString (backend_egl->edpy, EGL_VERSION),
                 eglQueryString (backend_egl->edpy, EGL_EXTENSIONS));
 
-  return CLUTTER_FEATURE_STAGE_STATIC;
+  return flags;
 }
 
+static ClutterStageWindow *
+clutter_backend_egl_create_stage (ClutterBackend  *backend,
+                                  ClutterStage    *wrapper,
+                                  GError         **error)
+{
+#ifdef COGL_HAS_XLIB_SUPPORT
+  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
+  ClutterStageWindow *stage;
+  ClutterStageX11 *stage_x11;
+
+  CLUTTER_NOTE (BACKEND, "Creating stage of type '%s'",
+                g_type_name (CLUTTER_STAGE_TYPE));
+
+  stage = g_object_new (CLUTTER_TYPE_STAGE_EGL, NULL);
+
+  /* copy backend data into the stage */
+  stage_x11 = CLUTTER_STAGE_X11 (stage);
+  stage_x11->wrapper = wrapper;
+
+  CLUTTER_NOTE (MISC, "EGLX stage created (display:%p, screen:%d, root:%u)",
+                backend_x11->xdpy,
+                backend_x11->xscreen_num,
+                (unsigned int) backend_x11->xwin_root);
+
+#else /* COGL_HAS_XLIB_SUPPORT */
+
+  ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
+  ClutterStageWindow *stage;
+  ClutterStageEGL *stage_egl;
+
+  if (G_UNLIKELY (backend_egl->stage != NULL))
+    {
+      g_set_error (error, CLUTTER_INIT_ERROR,
+                   CLUTTER_INIT_ERROR_BACKEND,
+                   "The EGL native backend does not support multiple stages");
+      return backend_egl->stage;
+    }
+
+  stage = g_object_new (CLUTTER_TYPE_STAGE_EGL, NULL);
+
+  stage_egl = CLUTTER_STAGE_EGL (stage);
+  stage_egl->backend = backend_egl;
+  stage_egl->wrapper = wrapper;
+
+  backend_egl->stage = stage;
+
+#endif /* COGL_HAS_XLIB_SUPPORT */
+
+  return stage;
+}
+
+#ifdef COGL_HAS_XLIB_SUPPORT
+static XVisualInfo *
+clutter_backend_egl_get_visual_info (ClutterBackendX11 *backend_x11)
+{
+  ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend_x11);
+  XVisualInfo visinfo_template;
+  int template_mask = 0;
+  XVisualInfo *visinfo = NULL;
+  int visinfos_count;
+  EGLint visualid, red_size, green_size, blue_size, alpha_size;
+
+  if (!clutter_backend_egl_create_context (CLUTTER_BACKEND (backend_x11), NULL))
+    return NULL;
+
+  visinfo_template.screen = backend_x11->xscreen_num;
+  template_mask |= VisualScreenMask;
+
+  eglGetConfigAttrib (backend_egl->edpy, backend_egl->egl_config,
+                      EGL_NATIVE_VISUAL_ID, &visualid);
+
+  if (visualid != 0)
+    {
+      visinfo_template.visualid = visualid;
+      template_mask |= VisualIDMask;
+    }
+  else
+    {
+      /* some EGL drivers don't implement the EGL_NATIVE_VISUAL_ID
+       * attribute, so attempt to find the closest match. */
+
+      eglGetConfigAttrib (backend_egl->edpy, backend_egl->egl_config,
+                          EGL_RED_SIZE, &red_size);
+      eglGetConfigAttrib (backend_egl->edpy, backend_egl->egl_config,
+                          EGL_GREEN_SIZE, &green_size);
+      eglGetConfigAttrib (backend_egl->edpy, backend_egl->egl_config,
+                          EGL_BLUE_SIZE, &blue_size);
+      eglGetConfigAttrib (backend_egl->edpy, backend_egl->egl_config,
+                          EGL_ALPHA_SIZE, &alpha_size);
+
+      visinfo_template.depth = red_size + green_size + blue_size + alpha_size;
+      template_mask |= VisualDepthMask;
+    }
+
+  visinfo = XGetVisualInfo (backend_x11->xdpy,
+                            template_mask,
+                            &visinfo_template,
+                            &visinfos_count);
+
+  return visinfo;
+}
+#endif
+
 static void
 clutter_backend_egl_class_init (ClutterBackendEGLClass *klass)
 {
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
   ClutterBackendClass *backend_class = CLUTTER_BACKEND_CLASS (klass);
+#ifdef COGL_HAS_X11_SUPPORT
+  ClutterBackendX11Class *backendx11_class = CLUTTER_BACKEND_X11_CLASS (klass);
+#endif
 
   gobject_class->constructor = clutter_backend_egl_constructor;
   gobject_class->dispose     = clutter_backend_egl_dispose;
@@ -428,26 +741,42 @@ clutter_backend_egl_class_init (ClutterBackendEGLClass *klass)
 
   backend_class->pre_parse        = clutter_backend_egl_pre_parse;
   backend_class->post_parse       = clutter_backend_egl_post_parse;
+  backend_class->get_features     = clutter_backend_egl_get_features;
+#ifdef HAVE_TSLIB
   backend_class->init_events      = clutter_backend_egl_init_events;
+#endif
   backend_class->create_stage     = clutter_backend_egl_create_stage;
   backend_class->create_context   = clutter_backend_egl_create_context;
   backend_class->ensure_context   = clutter_backend_egl_ensure_context;
   backend_class->redraw           = clutter_backend_egl_redraw;
-  backend_class->get_features     = clutter_backend_egl_get_features;
+
+#ifdef COGL_HAS_XLIB_SUPPORT
+  backendx11_class->get_visual_info = clutter_backend_egl_get_visual_info;
+#endif
 }
 
 static void
 clutter_backend_egl_init (ClutterBackendEGL *backend_egl)
 {
+#ifndef COGL_HAS_XLIB_SUPPORT
   ClutterBackend *backend = CLUTTER_BACKEND (backend_egl);
 
   clutter_backend_set_resolution (backend, 96.0);
   clutter_backend_set_double_click_time (backend, 250);
   clutter_backend_set_double_click_distance (backend, 5);
 
+#ifdef HAVE_TSLIB
   backend_egl->event_timer = g_timer_new ();
+#endif
 
   backend_egl->fb_device_id = -1;
+
+#else
+
+  backend_egl->egl_context = EGL_NO_CONTEXT;
+  backend_egl->dummy_surface = EGL_NO_SURFACE;
+
+#endif
 }
 
 GType
@@ -456,6 +785,23 @@ _clutter_backend_impl_get_type (void)
   return clutter_backend_egl_get_type ();
 }
 
+#ifdef COGL_HAS_XLIB_SUPPORT
+/**
+ * clutter_eglx_display:
+ *
+ * Retrieves the <structname>EGLDisplay</structname> used by Clutter
+ *
+ * Return value: the EGL display
+ *
+ * Since: 0.4
+ */
+EGLDisplay
+clutter_eglx_display (void)
+{
+  return backend_singleton->edpy;
+}
+#endif /* COGL_HAS_XLIB_SUPPORT */
+
 /**
  * clutter_egl_display:
  *
@@ -468,3 +814,4 @@ clutter_egl_display (void)
 {
   return backend_singleton->edpy;
 }
+

clutter/eglnative/clutter-backend-egl.h

@@ -1,8 +1,6 @@
 /* Clutter.
  * An OpenGL based 'interactive canvas' library.
  *
- * Authored By Matthew Allum  <mallum@openedhand.com>
- *
  * Copyright (C) 2006, 2007, 2008 OpenedHand
  * Copyright (C) 2009, 2010 Intel Corp
  *
@@ -19,16 +17,24 @@
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  *
- *
+ * Authors:
+ *  Matthew Allum
+ *  Robert Bragg
  */
 
 #ifndef __CLUTTER_BACKEND_EGL_H__
 #define __CLUTTER_BACKEND_EGL_H__
 
+#include <glib-object.h>
+#include <clutter/clutter-event.h>
+#include <clutter/clutter-backend.h>
+#ifdef COGL_HAS_XLIB_SUPPORT
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+#endif
+
 #include "clutter-egl-headers.h"
 
-#include <glib-object.h>
-#include <clutter/clutter-backend.h>
 G_BEGIN_DECLS
 
 #define CLUTTER_TYPE_BACKEND_EGL                (clutter_backend_egl_get_type ())
@@ -43,6 +49,19 @@ typedef struct _ClutterBackendEGLClass  ClutterBackendEGLClass;
 
 struct _ClutterBackendEGL
 {
+#ifdef COGL_HAS_XLIB_SUPPORT
+  ClutterBackendX11 parent_instance;
+
+  /* EGL Specific */
+  EGLDisplay edpy;
+  EGLContext egl_context;
+  EGLConfig  egl_config;
+
+  Window     dummy_xwin;
+  EGLSurface dummy_surface;
+
+#else /* COGL_HAS_X11_SUPPORT */
+
   ClutterBackend parent_instance;
 
   /* EGL Specific */
@@ -54,9 +73,6 @@ struct _ClutterBackendEGL
   gint surface_width;
   gint surface_height;
 
-  gint egl_version_major;
-  gint egl_version_minor;
-
   /* main stage singleton */
   ClutterStageWindow *stage;
 
@@ -69,12 +85,19 @@ struct _ClutterBackendEGL
   /* FB device */
   gint fb_device_id;
 
-  /*< private >*/
+#endif /* COGL_HAS_X11_SUPPORT */
+
+  gint egl_version_major;
+  gint egl_version_minor;
 };
 
 struct _ClutterBackendEGLClass
 {
+#ifdef COGL_HAS_XLIB_SUPPORT
+  ClutterBackendX11Class parent_class;
+#else
   ClutterBackendClass parent_class;
+#endif
 };
 
 GType clutter_backend_egl_get_type (void) G_GNUC_CONST;

clutter/eglnative/clutter-stage-egl.c

@@ -18,17 +18,189 @@
 #include "../clutter-stage.h"
 #include "../clutter-stage-window.h"
 
+#ifdef COGL_HAS_X11_SUPPORT
+static ClutterStageWindowIface *clutter_stage_egl_parent_iface = NULL;
+#endif
+
 static void clutter_stage_window_iface_init (ClutterStageWindowIface *iface);
 
 G_DEFINE_TYPE_WITH_CODE (ClutterStageEGL,
                          clutter_stage_egl,
+#ifdef COGL_HAS_X11_SUPPORT
+                         CLUTTER_TYPE_STAGE_X11,
+#else
                          G_TYPE_OBJECT,
+#endif
                          G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_STAGE_WINDOW,
                                                 clutter_stage_window_iface_init));
 
+#ifdef COGL_HAS_XLIB_SUPPORT
+
 static void
-clutter_stage_egl_class_init (ClutterStageEGLClass *klass)
+clutter_stage_egl_unrealize (ClutterStageWindow *stage_window)
 {
+  ClutterBackend *backend = clutter_get_default_backend ();
+  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
+  ClutterStageEGL *stage_egl = CLUTTER_STAGE_EGL (stage_window);
+  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (stage_window);
+
+  CLUTTER_NOTE (BACKEND, "Unrealizing stage");
+
+  clutter_x11_trap_x_errors ();
+
+  if (!stage_x11->is_foreign_xwin && stage_x11->xwin != None)
+    {
+      XDestroyWindow (backend_x11->xdpy, stage_x11->xwin);
+      stage_x11->xwin = None;
+    }
+  else
+    stage_x11->xwin = None;
+
+  if (stage_egl->egl_surface != EGL_NO_SURFACE)
+    {
+      eglDestroySurface (clutter_eglx_display (), stage_egl->egl_surface);
+      stage_egl->egl_surface = EGL_NO_SURFACE;
+    }
+
+  XSync (backend_x11->xdpy, False);
+
+  clutter_x11_untrap_x_errors ();
+}
+
+static gboolean
+clutter_stage_egl_realize (ClutterStageWindow *stage_window)
+{
+  ClutterStageEGL   *stage_egl = CLUTTER_STAGE_EGL (stage_window);
+  ClutterStageX11   *stage_x11 = CLUTTER_STAGE_X11 (stage_window);
+  ClutterBackend    *backend;
+  ClutterBackendEGL *backend_egl;
+  ClutterBackendX11 *backend_x11;
+  EGLDisplay         edpy;
+
+  CLUTTER_NOTE (BACKEND, "Realizing main stage");
+
+  backend     = clutter_get_default_backend ();
+  backend_egl = CLUTTER_BACKEND_EGL (backend);
+  backend_x11 = CLUTTER_BACKEND_X11 (backend);
+
+  edpy = clutter_eglx_display ();
+
+  if (stage_x11->xwin == None)
+    {
+      XSetWindowAttributes xattr;
+      unsigned long mask;
+      XVisualInfo *xvisinfo;
+      gfloat width, height;
+
+      CLUTTER_NOTE (MISC, "Creating stage X window");
+
+      xvisinfo = clutter_backend_x11_get_visual_info (backend_x11);
+      if (xvisinfo == NULL)
+        {
+          g_critical ("Unable to find suitable GL visual.");
+          return FALSE;
+        }
+
+      /* window attributes */
+      xattr.background_pixel = WhitePixel (backend_x11->xdpy,
+                                           backend_x11->xscreen_num);
+      xattr.border_pixel = 0;
+      xattr.colormap = XCreateColormap (backend_x11->xdpy,
+                                        backend_x11->xwin_root,
+                                        xvisinfo->visual,
+                                        AllocNone);
+      mask = CWBorderPixel | CWColormap;
+
+      /* Call get_size - this will either get the geometry size (which
+       * before we create the window is set to 640x480), or if a size
+       * is set, it will get that. This lets you set a size on the
+       * stage before it's realized.
+       */
+      clutter_actor_get_size (CLUTTER_ACTOR (stage_x11->wrapper),
+                              &width,
+                              &height);
+      stage_x11->xwin_width = (gint)width;
+      stage_x11->xwin_height = (gint)height;
+
+      stage_x11->xwin = XCreateWindow (backend_x11->xdpy,
+                                       backend_x11->xwin_root,
+                                       0, 0,
+                                       stage_x11->xwin_width,
+                                       stage_x11->xwin_height,
+                                       0,
+                                       xvisinfo->depth,
+                                       InputOutput,
+                                       xvisinfo->visual,
+                                       mask, &xattr);
+
+      CLUTTER_NOTE (BACKEND, "Stage [%p], window: 0x%x, size: %dx%d",
+                    stage_window,
+                    (unsigned int) stage_x11->xwin,
+                    stage_x11->xwin_width,
+                    stage_x11->xwin_height);
+
+      XFree (xvisinfo);
+    }
+
+  if (stage_egl->egl_surface == EGL_NO_SURFACE)
+    {
+      stage_egl->egl_surface =
+        eglCreateWindowSurface (edpy,
+                                backend_egl->egl_config,
+                                (NativeWindowType) stage_x11->xwin,
+                                NULL);
+    }
+
+  if (stage_egl->egl_surface == EGL_NO_SURFACE)
+    g_warning ("Unable to create an EGL surface");
+
+  if (clutter_x11_has_event_retrieval ())
+    {
+      if (clutter_x11_has_xinput ())
+        {
+          XSelectInput (backend_x11->xdpy, stage_x11->xwin,
+                        StructureNotifyMask |
+                        FocusChangeMask |
+                        ExposureMask |
+                        EnterWindowMask | LeaveWindowMask |
+                        PropertyChangeMask);
+#ifdef USE_XINPUT
+          _clutter_x11_select_events (stage_x11->xwin);
+#endif
+        }
+      else
+        XSelectInput (backend_x11->xdpy, stage_x11->xwin,
+                      StructureNotifyMask |
+                      FocusChangeMask |
+                      ExposureMask |
+                      PointerMotionMask |
+                      KeyPressMask | KeyReleaseMask |
+                      ButtonPressMask | ButtonReleaseMask |
+                      EnterWindowMask | LeaveWindowMask |
+                      PropertyChangeMask);
+    }
+
+  /* no user resize... */
+  clutter_stage_x11_fix_window_size (stage_x11,
+                                     stage_x11->xwin_width,
+                                     stage_x11->xwin_height);
+  clutter_stage_x11_set_wm_protocols (stage_x11);
+
+  return clutter_stage_egl_parent_iface->realize (stage_window);
+}
+
+#else /* COGL_HAS_XLIB_SUPPORT */
+
+static void
+clutter_stage_egl_unrealize (ClutterStageWindow *stage_window)
+{
+}
+
+static gboolean
+clutter_stage_egl_realize (ClutterStageWindow *stage_window)
+{
+  /* the EGL surface is created by the backend */
+  return TRUE;
 }
 
 static void
@@ -78,18 +250,6 @@ clutter_stage_egl_hide (ClutterStageWindow *stage_window)
   clutter_actor_unmap (CLUTTER_ACTOR (stage_egl->wrapper));
 }
 
-static void
-clutter_stage_egl_unrealize (ClutterStageWindow *stage_window)
-{
-}
-
-static gboolean
-clutter_stage_egl_realize (ClutterStageWindow *stage_window)
-{
-  /* the EGL surface is created by the backend */
-  return TRUE;
-}
-
 static void
 clutter_stage_egl_get_geometry (ClutterStageWindow *stage_window,
                                 ClutterGeometry    *geometry)
@@ -113,22 +273,94 @@ clutter_stage_egl_resize (ClutterStageWindow *stage_window,
 {
 }
 
+#endif /* COGL_HAS_XLIB_SUPPORT */
+
 static void
 clutter_stage_window_iface_init (ClutterStageWindowIface *iface)
 {
+#ifdef COGL_HAS_X11_SUPPORT
+  clutter_stage_egl_parent_iface = g_type_interface_peek_parent (iface);
+
+  iface->realize = clutter_stage_egl_realize;
+  iface->unrealize = clutter_stage_egl_unrealize;
+
+  /* the rest is inherited from ClutterStageX11 */
+
+#else /* COGL_HAS_X11_SUPPORT */
+
+  iface->realize = clutter_stage_egl_realize;
+  iface->unrealize = clutter_stage_egl_unrealize;
   iface->set_fullscreen = clutter_stage_egl_set_fullscreen;
   iface->set_title = clutter_stage_egl_set_title;
   iface->set_cursor_visible = clutter_stage_egl_set_cursor_visible;
   iface->get_wrapper = clutter_stage_egl_get_wrapper;
-  iface->realize = clutter_stage_egl_realize;
-  iface->unrealize = clutter_stage_egl_unrealize;
   iface->get_geometry = clutter_stage_egl_get_geometry;
   iface->resize = clutter_stage_egl_resize;
   iface->show = clutter_stage_egl_show;
   iface->hide = clutter_stage_egl_hide;
+
+#endif /* COGL_HAS_X11_SUPPORT */
+}
+
+#ifdef COGL_HAS_X11_SUPPORT
+static void
+clutter_stage_egl_dispose (GObject *gobject)
+{
+  G_OBJECT_CLASS (clutter_stage_egl_parent_class)->dispose (gobject);
+}
+
+static void
+clutter_stage_egl_class_init (ClutterStageEGLClass *klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+  gobject_class->dispose = clutter_stage_egl_dispose;
 }
 
 static void
 clutter_stage_egl_init (ClutterStageEGL *stage)
 {
+  stage->egl_surface = EGL_NO_SURFACE;
+}
+
+#else /* COGL_HAS_X11_SUPPORT */
+
+static void
+clutter_stage_egl_class_init (ClutterStageEGLClass *klass)
+{
+}
+
+static void
+clutter_stage_egl_init (ClutterStageEGL *stage)
+{
+  /* Without X we only support one surface and that is associated
+   * with the backend directly instead of the stage */
+}
+
+#endif /* COGL_HAS_X11_SUPPORT */
+
+void
+clutter_stage_egl_redraw (ClutterStageEGL *stage_egl,
+                          ClutterStage    *stage)
+{
+  ClutterBackend     *backend = clutter_get_default_backend ();
+  ClutterBackendEGL  *backend_egl = CLUTTER_BACKEND_EGL (backend);
+  ClutterActor       *wrapper;
+  EGLSurface          egl_surface;
+#ifdef COGL_HAS_X11_SUPPORT
+  ClutterStageX11    *stage_x11 = CLUTTER_STAGE_X11 (stage_egl);
+
+  wrapper = CLUTTER_ACTOR (stage_x11->wrapper);
+  egl_surface = stage_egl->egl_surface;
+#else
+  wrapper = CLUTTER_ACTOR (stage_egl->wrapper);
+  /* Without X we only support one surface and that is associated
+   * with the backend directly instead of the stage */
+  egl_surface = backend_egl->egl_surface;
+#endif
+
+  clutter_actor_paint (wrapper);
+  cogl_flush ();
+
+  eglSwapBuffers (backend_egl->edpy, egl_surface);
 }

clutter/eglnative/clutter-stage-egl.h

@@ -35,4 +35,7 @@ struct _ClutterStageEGLClass
 
 GType clutter_stage_egl_get_type (void) G_GNUC_CONST;
 
+void  clutter_stage_egl_redraw   (ClutterStageEGL *stage_egl,
+                                  ClutterStage    *stage);
+
 #endif /* __CLUTTER_STAGE_EGL_H__ */

clutter/eglx/clutter-backend-egl.c

@@ -1,9 +1,45 @@
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+
+ * Authors:
+ *  Matthew Allum
+ *  Emmanuele Bassi
+ *  Robert Bragg
+ *  Neil Roberts
+ */
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <errno.h>
+
 #include "clutter-backend-egl.h"
 #include "clutter-stage-egl.h"
+#include "clutter-eglx.h"
+
 #include "../clutter-private.h"
 #include "../clutter-main.h"
 #include "../clutter-debug.h"
@@ -11,7 +47,13 @@
 
 static ClutterBackendEGL *backend_singleton = NULL;
 
+static const gchar *clutter_fb_device = NULL;
+
+#ifdef COGL_HAS_X11_SUPPORT
 G_DEFINE_TYPE (ClutterBackendEGL, clutter_backend_egl, CLUTTER_TYPE_BACKEND_X11);
+#else
+G_DEFINE_TYPE (ClutterBackendEGL, clutter_backend_egl, CLUTTER_TYPE_BACKEND);
+#endif
 
 static void
 clutter_backend_at_exit (void)
@@ -20,23 +62,58 @@ clutter_backend_at_exit (void)
     g_object_run_dispose (G_OBJECT (backend_singleton));
 }
 
+static gboolean
+clutter_backend_egl_pre_parse (ClutterBackend  *backend,
+                               GError         **error)
+{
+  const gchar *env_string;
+#ifdef COGL_HAS_X11_SUPPORT
+  ClutterBackendClass *backend_x11_class =
+    CLUTTER_BACKEND_CLASS (clutter_backend_egl_parent_class);
+
+  if (!backend_x11_class->pre_parse (backend, error))
+    return FALSE;
+#endif
+
+  env_string = g_getenv ("CLUTTER_FB_DEVICE");
+  if (env_string != NULL && env_string[0] != '\0')
+    clutter_fb_device = g_strdup (env_string);
+
+  return TRUE;
+}
+
 static gboolean
 clutter_backend_egl_post_parse (ClutterBackend  *backend,
                                 GError         **error)
 {
   ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
+#ifdef COGL_HAS_X11_SUPPORT
   ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
-
+  ClutterBackendClass *backend_x11_class =
-  if (clutter_backend_x11_post_parse (backend, error))
+    CLUTTER_BACKEND_CLASS (clutter_backend_egl_parent_class);
-    {
+#endif
   EGLBoolean status;
 
+#ifdef COGL_HAS_X11_SUPPORT
+  if (!backend_x11_class->post_parse (backend, error))
+    return FALSE;
+
+#ifndef COGL_HAS_XLIB_SUPPORT
+#error "Clutter's EGL on X11 support currently only works with xlib Displays"
+#endif
   backend_egl->edpy =
     eglGetDisplay ((NativeDisplayType) backend_x11->xdpy);
 
   status = eglInitialize (backend_egl->edpy,
                           &backend_egl->egl_version_major,
                           &backend_egl->egl_version_minor);
+#else
+  backend_egl->edpy = eglGetDisplay (EGL_DEFAULT_DISPLAY);
+
+  status = eglInitialize (backend_egl->edpy,
+			  &backend_egl->egl_version_major,
+			  &backend_egl->egl_version_minor);
+#endif
 
   g_atexit (clutter_backend_at_exit);
 
@@ -48,8 +125,6 @@ clutter_backend_egl_post_parse (ClutterBackend  *backend,
       return FALSE;
     }
 
-    }
-
   CLUTTER_NOTE (BACKEND, "EGL Reports version %i.%i",
 		backend_egl->egl_version_major,
 		backend_egl->egl_version_minor);
@@ -61,45 +136,54 @@ static gboolean
 clutter_backend_egl_create_context (ClutterBackend  *backend,
                                     GError         **error)
 {
-  ClutterBackendEGL *backend_egl;
+  ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
-  ClutterBackendX11 *backend_x11;
+#ifdef COGL_HAS_X11_SUPPORT
+  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
+#endif
   EGLConfig          config;
   EGLint             config_count = 0;
   EGLBoolean         status;
   EGLint             cfg_attribs[] = {
     /* NB: This must be the first attribute, since we may
      * try and fallback to no stencil buffer */
-    EGL_STENCIL_SIZE,   8,
+    EGL_STENCIL_SIZE,    2,
 
-    EGL_RED_SIZE,       5,
+    EGL_RED_SIZE,        1,
-    EGL_GREEN_SIZE,     6,
+    EGL_GREEN_SIZE,      1,
-    EGL_BLUE_SIZE,      5,
+    EGL_BLUE_SIZE,       1,
+    EGL_ALPHA_SIZE,      EGL_DONT_CARE,
+
+    EGL_DEPTH_SIZE,      1,
 
     EGL_BUFFER_SIZE,     EGL_DONT_CARE,
 
-#ifdef HAVE_COGL_GLES2
+#if defined (HAVE_COGL_GLES2)
     EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
-#else /* HAVE_COGL_GLES2 */
+#else
+    EGL_RENDERABLE_TYPE, EGL_OPENGL_ES_BIT,
+#endif
+
     EGL_SURFACE_TYPE,    EGL_WINDOW_BIT,
-#endif /* HAVE_COGL_GLES2 */
 
     EGL_NONE
   };
   EGLDisplay edpy;
   gint retry_cookie = 0;
+  const char *error_message = NULL;
+#ifdef COGL_HAS_XLIB_SUPPORT
   XVisualInfo *xvisinfo;
   XSetWindowAttributes attrs;
-
+#endif
-  backend     = clutter_get_default_backend ();
-  backend_egl = CLUTTER_BACKEND_EGL (backend);
 
   if (backend_egl->egl_context != EGL_NO_CONTEXT)
     return TRUE;
 
-  backend_x11 = CLUTTER_BACKEND_X11 (backend);
-
   edpy = clutter_eglx_display ();
 
+/* XXX: we should get rid of this goto yukkyness, there is a fail:
+ * goto at the end and this retry: goto at the top, but we should just
+ * have a try_create_context() function and call it in a loop that
+ * tries a different fallback each iteration */
 retry:
   /* Here we can change the attributes depending on the fallback count... */
 
@@ -118,37 +202,41 @@ retry:
                             &config_count);
   if (status != EGL_TRUE || config_count == 0)
     {
-      g_warning ("eglChooseConfig failed");
+      error_message = "Unable to select a valid EGL configuration";
       goto fail;
     }
 
-  if (G_UNLIKELY (backend_egl->egl_context == EGL_NO_CONTEXT))
+  if (backend_egl->egl_context == EGL_NO_CONTEXT)
     {
 #ifdef HAVE_COGL_GLES2
-      static const EGLint attribs[3]
+      static const EGLint attribs[] =
-        = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
+        { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
 
       backend_egl->egl_context = eglCreateContext (edpy,
                                                    config,
                                                    EGL_NO_CONTEXT,
                                                    attribs);
+
 #else
-      /* Seems some GLES implementations 1.x do not like attribs... */
       backend_egl->egl_context = eglCreateContext (edpy,
                                                    config,
                                                    EGL_NO_CONTEXT,
                                                    NULL);
+
 #endif
       if (backend_egl->egl_context == EGL_NO_CONTEXT)
         {
-          g_warning ("Unable to create a suitable EGL context");
+          error_message = "Unable to create a suitable EGL context";
           goto fail;
         }
 
+#ifdef COGL_HAS_XLIB_SUPPORT
       backend_egl->egl_config = config;
+#endif
       CLUTTER_NOTE (GL, "Created EGL Context");
     }
 
+#ifdef COGL_HAS_XLIB_SUPPORT
   /* COGL assumes that there is always a GL context selected; in order
    * to make sure that an EGL context exists and is made current, we use
    * a dummy, offscreen override-redirect window to which we can always
@@ -199,6 +287,80 @@ retry:
                   backend_egl->dummy_surface,
                   backend_egl->egl_context);
 
+#else /* COGL_HAS_XLIB_SUPPORT */
+
+  if (clutter_fb_device != NULL)
+    {
+      int fd = open (clutter_fb_device, O_RDWR);
+
+      if (fd < 0)
+        {
+          int errno_save = errno;
+
+          g_set_error (error, CLUTTER_INIT_ERROR,
+                       CLUTTER_INIT_ERROR_BACKEND,
+                       "Unable to open the framebuffer device '%s': %s",
+                       clutter_fb_device,
+                       g_strerror (errno_save));
+
+          return FALSE;
+        }
+      else
+        backend_egl->fb_device_id = fd;
+
+      backend_egl->egl_surface =
+        eglCreateWindowSurface (edpy,
+                                config,
+                                (NativeWindowType) backend_egl->fb_device_id,
+                                NULL);
+    }
+  else
+    {
+      backend_egl->egl_surface =
+        eglCreateWindowSurface (edpy,
+                                config,
+                                (NativeWindowType) NULL,
+                                NULL);
+    }
+
+  if (backend_egl->egl_surface == EGL_NO_SURFACE)
+    {
+      g_set_error (error, CLUTTER_INIT_ERROR,
+                   CLUTTER_INIT_ERROR_BACKEND,
+                   "Unable to create EGL window surface");
+
+      return FALSE;
+    }
+
+  CLUTTER_NOTE (BACKEND, "Setting context");
+
+  /* Without X we assume we can have only one stage, so we
+   * store the EGL surface in the backend itself, instead
+   * of the StageWindow implementation, and we make it
+   * current immediately to make sure the Cogl and Clutter
+   * can query the EGL context for features.
+   */
+  status = eglMakeCurrent (backend_egl->edpy,
+                           backend_egl->egl_surface,
+                           backend_egl->egl_surface,
+                           backend_egl->egl_context);
+
+  eglQuerySurface (backend_egl->edpy,
+                   backend_egl->egl_surface,
+                   EGL_WIDTH,
+                   &backend_egl->surface_width);
+
+  eglQuerySurface (backend_egl->edpy,
+                   backend_egl->egl_surface,
+                   EGL_HEIGHT,
+                   &backend_egl->surface_height);
+
+  CLUTTER_NOTE (BACKEND, "EGL surface is %ix%i",
+                backend_egl->surface_width,
+                backend_egl->surface_height);
+
+#endif /* COGL_HAS_XLIB_SUPPORT */
+
   return TRUE;
 
 fail:
@@ -210,6 +372,10 @@ fail:
       goto retry;
     }
 
+  g_set_error (error, CLUTTER_INIT_ERROR,
+               CLUTTER_INIT_ERROR_BACKEND,
+               "%s", error_message);
+
   return FALSE;
 }
 
@@ -217,6 +383,11 @@ static void
 clutter_backend_egl_ensure_context (ClutterBackend *backend,
                                     ClutterStage   *stage)
 {
+#ifndef COGL_HAS_XLIB_SUPPORT
+  /* Without X we only have one EGL surface to worry about
+   * so we can assume it is permanently made current and
+   * don't have to do anything here. */
+#else
   ClutterBackendEGL  *backend_egl = CLUTTER_BACKEND_EGL (backend);
   ClutterStageWindow *impl;
 
@@ -283,6 +454,7 @@ clutter_backend_egl_ensure_context (ClutterBackend *backend,
                     "EGLX drawable",
                     (int) stage_x11->xwin);
     }
+#endif /* COGL_HAS_XLIB_SUPPORT */
 }
 
 static void
@@ -300,6 +472,15 @@ clutter_backend_egl_redraw (ClutterBackend *backend,
   clutter_stage_egl_redraw (CLUTTER_STAGE_EGL (impl), stage);
 }
 
+#ifdef HAVE_TSLIB
+static void
+clutter_backend_egl_init_events (ClutterBackend *backend)
+{
+  /* XXX: This should be renamed to _clutter_events_tslib_init */
+  _clutter_events_egl_init (CLUTTER_BACKEND_EGL (backend));
+}
+#endif
+
 static void
 clutter_backend_egl_finalize (GObject *gobject)
 {
@@ -313,7 +494,11 @@ static void
 clutter_backend_egl_dispose (GObject *gobject)
 {
   ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (gobject);
+#ifdef COGL_HAS_X11_SUPPORT
   ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (gobject);
+#else
+  ClutterStageEGL   *stage_egl = CLUTTER_STAGE_EGL (backend_egl->stage);
+#endif
 
   /* We chain up before disposing our own resources so that
      ClutterBackendX11 will destroy all of the stages before we
@@ -321,6 +506,12 @@ clutter_backend_egl_dispose (GObject *gobject)
      calls during destruction which causes a crash */
   G_OBJECT_CLASS (clutter_backend_egl_parent_class)->dispose (gobject);
 
+#ifdef HAVE_TSLIB
+  /* XXX: This should be renamed to _clutter_events_tslib_uninit */
+  _clutter_events_egl_uninit (backend_egl);
+#endif
+
+#ifdef COGL_HAS_XLIB_SUPPORT
   if (backend_egl->dummy_surface != EGL_NO_SURFACE)
     {
       eglDestroySurface (backend_egl->edpy, backend_egl->dummy_surface);
@@ -333,6 +524,28 @@ clutter_backend_egl_dispose (GObject *gobject)
       backend_egl->dummy_xwin = None;
     }
 
+#else /* COGL_HAS_XLIB_SUPPORT */
+
+  if (backend_egl->egl_surface != EGL_NO_SURFACE)
+    {
+      eglDestroySurface (backend_egl->edpy, backend_egl->egl_surface);
+      backend_egl->egl_surface = EGL_NO_SURFACE;
+    }
+
+  if (backend_egl->stage != NULL)
+    {
+      clutter_actor_destroy (CLUTTER_ACTOR (stage_egl->wrapper));
+      backend_egl->stage = NULL;
+    }
+
+  if (backend_egl->fb_device_id != -1)
+    {
+      close (backend_egl->fb_device_id);
+      backend_egl->fb_device_id = -1;
+    }
+
+#endif /* COGL_HAS_XLIB_SUPPORT */
+
   if (backend_egl->egl_context)
     {
       eglDestroyContext (backend_egl->edpy, backend_egl->egl_context);
@@ -344,6 +557,14 @@ clutter_backend_egl_dispose (GObject *gobject)
       eglTerminate (backend_egl->edpy);
       backend_egl->edpy = 0;
     }
+
+#ifdef HAVE_TSLIB
+  if (backend_egl->event_timer != NULL)
+    {
+      g_timer_destroy (backend_egl->event_timer);
+      backend_egl->event_timer = NULL;
+    }
+#endif
 }
 
 static GObject *
@@ -376,8 +597,14 @@ clutter_backend_egl_get_features (ClutterBackend *backend)
   ClutterBackendEGL  *backend_egl = CLUTTER_BACKEND_EGL (backend);
   ClutterFeatureFlags flags;
 
+  g_assert (backend_egl->egl_context != NULL);
+
+#ifdef COGL_HAS_XLIB_SUPPORT
   flags = clutter_backend_x11_get_features (backend);
   flags |= CLUTTER_FEATURE_STAGE_MULTIPLE;
+#else
+  flags = CLUTTER_FEATURE_STAGE_STATIC;
+#endif
 
   CLUTTER_NOTE (BACKEND, "Checking features\n"
                 "GL_VENDOR: %s\n"
@@ -401,9 +628,10 @@ clutter_backend_egl_create_stage (ClutterBackend  *backend,
                                   ClutterStage    *wrapper,
                                   GError         **error)
 {
+#ifdef COGL_HAS_XLIB_SUPPORT
   ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
-  ClutterStageX11 *stage_x11;
   ClutterStageWindow *stage;
+  ClutterStageX11 *stage_x11;
 
   CLUTTER_NOTE (BACKEND, "Creating stage of type '%s'",
                 g_type_name (CLUTTER_STAGE_TYPE));
@@ -419,9 +647,34 @@ clutter_backend_egl_create_stage (ClutterBackend  *backend,
                 backend_x11->xscreen_num,
                 (unsigned int) backend_x11->xwin_root);
 
+#else /* COGL_HAS_XLIB_SUPPORT */
+
+  ClutterBackendEGL *backend_egl = CLUTTER_BACKEND_EGL (backend);
+  ClutterStageWindow *stage;
+  ClutterStageEGL *stage_egl;
+
+  if (G_UNLIKELY (backend_egl->stage != NULL))
+    {
+      g_set_error (error, CLUTTER_INIT_ERROR,
+                   CLUTTER_INIT_ERROR_BACKEND,
+                   "The EGL native backend does not support multiple stages");
+      return backend_egl->stage;
+    }
+
+  stage = g_object_new (CLUTTER_TYPE_STAGE_EGL, NULL);
+
+  stage_egl = CLUTTER_STAGE_EGL (stage);
+  stage_egl->backend = backend_egl;
+  stage_egl->wrapper = wrapper;
+
+  backend_egl->stage = stage;
+
+#endif /* COGL_HAS_XLIB_SUPPORT */
+
   return stage;
 }
 
+#ifdef COGL_HAS_XLIB_SUPPORT
 static XVisualInfo *
 clutter_backend_egl_get_visual_info (ClutterBackendX11 *backend_x11)
 {
@@ -471,32 +724,59 @@ clutter_backend_egl_get_visual_info (ClutterBackendX11 *backend_x11)
 
   return visinfo;
 }
+#endif
 
 static void
 clutter_backend_egl_class_init (ClutterBackendEGLClass *klass)
 {
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
   ClutterBackendClass *backend_class = CLUTTER_BACKEND_CLASS (klass);
+#ifdef COGL_HAS_X11_SUPPORT
   ClutterBackendX11Class *backendx11_class = CLUTTER_BACKEND_X11_CLASS (klass);
+#endif
 
   gobject_class->constructor = clutter_backend_egl_constructor;
   gobject_class->dispose     = clutter_backend_egl_dispose;
   gobject_class->finalize    = clutter_backend_egl_finalize;
 
+  backend_class->pre_parse        = clutter_backend_egl_pre_parse;
   backend_class->post_parse       = clutter_backend_egl_post_parse;
-  backend_class->redraw         = clutter_backend_egl_redraw;
   backend_class->get_features     = clutter_backend_egl_get_features;
+#ifdef HAVE_TSLIB
+  backend_class->init_events      = clutter_backend_egl_init_events;
+#endif
   backend_class->create_stage     = clutter_backend_egl_create_stage;
-  backend_class->ensure_context = clutter_backend_egl_ensure_context;
   backend_class->create_context   = clutter_backend_egl_create_context;
+  backend_class->ensure_context   = clutter_backend_egl_ensure_context;
+  backend_class->redraw           = clutter_backend_egl_redraw;
+
+#ifdef COGL_HAS_XLIB_SUPPORT
   backendx11_class->get_visual_info = clutter_backend_egl_get_visual_info;
+#endif
 }
 
 static void
 clutter_backend_egl_init (ClutterBackendEGL *backend_egl)
 {
+#ifndef COGL_HAS_XLIB_SUPPORT
+  ClutterBackend *backend = CLUTTER_BACKEND (backend_egl);
+
+  clutter_backend_set_resolution (backend, 96.0);
+  clutter_backend_set_double_click_time (backend, 250);
+  clutter_backend_set_double_click_distance (backend, 5);
+
+#ifdef HAVE_TSLIB
+  backend_egl->event_timer = g_timer_new ();
+#endif
+
+  backend_egl->fb_device_id = -1;
+
+#else
+
   backend_egl->egl_context = EGL_NO_CONTEXT;
   backend_egl->dummy_surface = EGL_NO_SURFACE;
+
+#endif
 }
 
 GType
@@ -505,12 +785,13 @@ _clutter_backend_impl_get_type (void)
   return clutter_backend_egl_get_type ();
 }
 
+#ifdef COGL_HAS_XLIB_SUPPORT
 /**
  * clutter_eglx_display:
  *
- * Gets the current EGLDisplay.
+ * Retrieves the <structname>EGLDisplay</structname> used by Clutter
  *
- * Return value: an EGLDisplay
+ * Return value: the EGL display
  *
  * Since: 0.4
  */
@@ -519,3 +800,18 @@ clutter_eglx_display (void)
 {
   return backend_singleton->edpy;
 }
+#endif /* COGL_HAS_XLIB_SUPPORT */
+
+/**
+ * clutter_egl_display:
+ *
+ * Retrieves the <structname>EGLDisplay</structname> used by Clutter
+ *
+ * Return value: the EGL display
+ */
+EGLDisplay
+clutter_egl_display (void)
+{
+  return backend_singleton->edpy;
+}
+

clutter/eglx/clutter-backend-egl.h

@@ -1,7 +1,8 @@
 /* Clutter.
  * An OpenGL based 'interactive canvas' library.
- * Authored By Matthew Allum  <mallum@openedhand.com>
+ *
- * Copyright (C) 2006-2007 OpenedHand
+ * Copyright (C) 2006, 2007 OpenedHand
+ * Copyright (C) 2010 Intel Corp
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -16,7 +17,9 @@
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  *
- *
+ * Authors:
+ *  Matthew Allum
+ *  Robert Bragg
  */
 
 #ifndef __CLUTTER_BACKEND_EGL_H__
@@ -25,12 +28,17 @@
 #include <glib-object.h>
 #include <clutter/clutter-event.h>
 #include <clutter/clutter-backend.h>
+#ifdef COGL_HAS_XLIB_SUPPORT
 #include <X11/Xlib.h>
 #include <X11/Xatom.h>
+#endif
 
 #include "clutter-egl-headers.h"
 
+#ifdef COGL_HAS_X11_SUPPORT
 #include "../x11/clutter-backend-x11.h"
+#endif
+
 #include "clutter-eglx.h"
 
 G_BEGIN_DECLS
@@ -47,27 +55,62 @@ typedef struct _ClutterBackendEGLClass  ClutterBackendEGLClass;
 
 struct _ClutterBackendEGL
 {
+#ifdef COGL_HAS_XLIB_SUPPORT
   ClutterBackendX11 parent_instance;
 
   /* EGL Specific */
   EGLDisplay edpy;
   EGLContext egl_context;
   EGLConfig  egl_config;
+
   Window     dummy_xwin;
   EGLSurface dummy_surface;
 
+#else /* COGL_HAS_X11_SUPPORT */
+
+  ClutterBackend parent_instance;
+
+  /* EGL Specific */
+  EGLDisplay edpy;
+  EGLSurface egl_surface;
+  EGLContext egl_context;
+
+  /* from the backend */
+  gint surface_width;
+  gint surface_height;
+
+  /* main stage singleton */
+  ClutterStageWindow *stage;
+
+  /* event source */
+  GSource *event_source;
+
+  /* event timer */
+  GTimer *event_timer;
+
+  /* FB device */
+  gint fb_device_id;
+
+#endif /* COGL_HAS_X11_SUPPORT */
+
   gint egl_version_major;
   gint egl_version_minor;
-
 };
 
 struct _ClutterBackendEGLClass
 {
+#ifdef COGL_HAS_XLIB_SUPPORT
   ClutterBackendX11Class parent_class;
+#else
+  ClutterBackendClass parent_class;
+#endif
 };
 
 GType clutter_backend_egl_get_type (void) G_GNUC_CONST;
 
+void _clutter_events_egl_init   (ClutterBackendEGL *backend);
+void _clutter_events_egl_uninit (ClutterBackendEGL *backend);
+
 G_END_DECLS
 
 #endif /* __CLUTTER_BACKEND_EGL_H__ */

clutter/eglx/clutter-stage-egl.c

@@ -2,9 +2,9 @@
 #include "config.h"
 #endif
 
-#include "clutter-backend-egl.h"
 #include "clutter-stage-egl.h"
 #include "clutter-eglx.h"
+#include "clutter-backend-egl.h"
 
 #include "../clutter-main.h"
 #include "../clutter-feature.h"
@@ -15,20 +15,27 @@
 #include "../clutter-private.h"
 #include "../clutter-debug.h"
 #include "../clutter-units.h"
-#include "../clutter-container.h"
 #include "../clutter-stage.h"
 #include "../clutter-stage-window.h"
 
+#ifdef COGL_HAS_X11_SUPPORT
 static ClutterStageWindowIface *clutter_stage_egl_parent_iface = NULL;
+#endif
 
 static void clutter_stage_window_iface_init (ClutterStageWindowIface *iface);
 
 G_DEFINE_TYPE_WITH_CODE (ClutterStageEGL,
                          clutter_stage_egl,
+#ifdef COGL_HAS_X11_SUPPORT
                          CLUTTER_TYPE_STAGE_X11,
+#else
+                         G_TYPE_OBJECT,
+#endif
                          G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_STAGE_WINDOW,
                                                 clutter_stage_window_iface_init));
 
+#ifdef COGL_HAS_XLIB_SUPPORT
+
 static void
 clutter_stage_egl_unrealize (ClutterStageWindow *stage_window)
 {
@@ -182,21 +189,124 @@ clutter_stage_egl_realize (ClutterStageWindow *stage_window)
   return clutter_stage_egl_parent_iface->realize (stage_window);
 }
 
+#else /* COGL_HAS_XLIB_SUPPORT */
+
 static void
-clutter_stage_egl_dispose (GObject *gobject)
+clutter_stage_egl_unrealize (ClutterStageWindow *stage_window)
 {
-  G_OBJECT_CLASS (clutter_stage_egl_parent_class)->dispose (gobject);
 }
 
+static gboolean
+clutter_stage_egl_realize (ClutterStageWindow *stage_window)
+{
+  /* the EGL surface is created by the backend */
+  return TRUE;
+}
+
+static void
+clutter_stage_egl_set_fullscreen (ClutterStageWindow *stage_window,
+                                  gboolean            fullscreen)
+{
+  g_warning ("Stage of type '%s' do not support ClutterStage::set_fullscreen",
+             G_OBJECT_TYPE_NAME (stage_window));
+}
+
+static void
+clutter_stage_egl_set_title (ClutterStageWindow *stage_window,
+                             const gchar        *title)
+{
+  g_warning ("Stage of type '%s' do not support ClutterStage::set_title",
+             G_OBJECT_TYPE_NAME (stage_window));
+}
+
+static void
+clutter_stage_egl_set_cursor_visible (ClutterStageWindow *stage_window,
+                                      gboolean            cursor_visible)
+{
+  g_warning ("Stage of type '%s' do not support ClutterStage::set_cursor_visible",
+             G_OBJECT_TYPE_NAME (stage_window));
+}
+
+static ClutterActor *
+clutter_stage_egl_get_wrapper (ClutterStageWindow *stage_window)
+{
+  return CLUTTER_ACTOR (CLUTTER_STAGE_EGL (stage_window)->wrapper);
+}
+
+static void
+clutter_stage_egl_show (ClutterStageWindow *stage_window,
+                        gboolean            do_raise)
+{
+  ClutterStageEGL *stage_egl = CLUTTER_STAGE_EGL (stage_window);
+
+  clutter_actor_map (CLUTTER_ACTOR (stage_egl->wrapper));
+}
+
+static void
+clutter_stage_egl_hide (ClutterStageWindow *stage_window)
+{
+  ClutterStageEGL *stage_egl = CLUTTER_STAGE_EGL (stage_window);
+
+  clutter_actor_unmap (CLUTTER_ACTOR (stage_egl->wrapper));
+}
+
+static void
+clutter_stage_egl_get_geometry (ClutterStageWindow *stage_window,
+                                ClutterGeometry    *geometry)
+{
+  ClutterStageEGL *stage_egl = CLUTTER_STAGE_EGL (stage_window);
+  ClutterBackendEGL *backend_egl = stage_egl->backend;
+
+  if (geometry)
+    {
+      geometry->x = geometry->y = 0;
+
+      geometry->width = backend_egl->surface_width;
+      geometry->height = backend_egl->surface_height;
+    }
+}
+
+static void
+clutter_stage_egl_resize (ClutterStageWindow *stage_window,
+                          gint                width,
+                          gint                height)
+{
+}
+
+#endif /* COGL_HAS_XLIB_SUPPORT */
+
 static void
 clutter_stage_window_iface_init (ClutterStageWindowIface *iface)
 {
+#ifdef COGL_HAS_X11_SUPPORT
   clutter_stage_egl_parent_iface = g_type_interface_peek_parent (iface);
 
   iface->realize = clutter_stage_egl_realize;
   iface->unrealize = clutter_stage_egl_unrealize;
 
   /* the rest is inherited from ClutterStageX11 */
+
+#else /* COGL_HAS_X11_SUPPORT */
+
+  iface->realize = clutter_stage_egl_realize;
+  iface->unrealize = clutter_stage_egl_unrealize;
+  iface->set_fullscreen = clutter_stage_egl_set_fullscreen;
+  iface->set_title = clutter_stage_egl_set_title;
+  iface->set_cursor_visible = clutter_stage_egl_set_cursor_visible;
+  iface->get_wrapper = clutter_stage_egl_get_wrapper;
+  iface->get_geometry = clutter_stage_egl_get_geometry;
+  iface->resize = clutter_stage_egl_resize;
+  iface->show = clutter_stage_egl_show;
+  iface->hide = clutter_stage_egl_hide;
+
+#endif /* COGL_HAS_X11_SUPPORT */
+}
+
+#ifdef COGL_HAS_X11_SUPPORT
+static void
+clutter_stage_egl_dispose (GObject *gobject)
+{
+  G_OBJECT_CLASS (clutter_stage_egl_parent_class)->dispose (gobject);
 }
 
 static void
@@ -213,24 +323,44 @@ clutter_stage_egl_init (ClutterStageEGL *stage)
   stage->egl_surface = EGL_NO_SURFACE;
 }
 
+#else /* COGL_HAS_X11_SUPPORT */
+
+static void
+clutter_stage_egl_class_init (ClutterStageEGLClass *klass)
+{
+}
+
+static void
+clutter_stage_egl_init (ClutterStageEGL *stage)
+{
+  /* Without X we only support one surface and that is associated
+   * with the backend directly instead of the stage */
+}
+
+#endif /* COGL_HAS_X11_SUPPORT */
+
 void
 clutter_stage_egl_redraw (ClutterStageEGL *stage_egl,
                           ClutterStage    *stage)
 {
   ClutterBackend     *backend = clutter_get_default_backend ();
   ClutterBackendEGL  *backend_egl = CLUTTER_BACKEND_EGL (backend);
+  ClutterActor       *wrapper;
+  EGLSurface          egl_surface;
+#ifdef COGL_HAS_X11_SUPPORT
   ClutterStageX11    *stage_x11 = CLUTTER_STAGE_X11 (stage_egl);
-  ClutterStageWindow *impl;
 
-  impl = _clutter_stage_get_window (stage);
+  wrapper = CLUTTER_ACTOR (stage_x11->wrapper);
-  if (impl == NULL)
+  egl_surface = stage_egl->egl_surface;
-    return;
+#else
+  wrapper = CLUTTER_ACTOR (stage_egl->wrapper);
+  /* Without X we only support one surface and that is associated
+   * with the backend directly instead of the stage */
+  egl_surface = backend_egl->egl_surface;
+#endif
 
-  g_assert (CLUTTER_IS_STAGE_EGL (impl));
+  clutter_actor_paint (wrapper);
-  stage_egl = CLUTTER_STAGE_EGL (impl);
-
-  clutter_actor_paint (CLUTTER_ACTOR (stage_x11->wrapper));
   cogl_flush ();
 
-  eglSwapBuffers (backend_egl->edpy, stage_egl->egl_surface);
+  eglSwapBuffers (backend_egl->edpy, egl_surface);
 }