From: Matthew Waters <ystreet00@gmail.com>
Date: Sat, 8 Dec 2012 22:30:48 +0000 (+1100)
Subject: [629/906] window: add GError for error handling of context creation
X-Git-Tag: 1.19.3~507^2~11903
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=76dfdd656f989f4eec95ca3f758f41ff52215e1e;p=platform%2Fupstream%2Fgstreamer.git

[629/906] window: add GError for error handling of context creation
---

diff --git a/gst-libs/gst/gl/cocoa/gstglwindow_cocoa.h b/gst-libs/gst/gl/cocoa/gstglwindow_cocoa.h
index 21b8b65..c41787f 100644
--- a/gst-libs/gst/gl/cocoa/gstglwindow_cocoa.h
+++ b/gst-libs/gst/gl/cocoa/gstglwindow_cocoa.h
@@ -23,7 +23,6 @@
 
 #include <gst/gst.h>
 
-#include "gstglapi.h"
 #include "gstglwindow.h"
 
 G_BEGIN_DECLS
@@ -60,7 +59,8 @@ struct _GstGLWindowCocoaClass {
 GType gst_gl_window_cocoa_get_type     (void);
 
 GstGLWindowCocoa * gst_gl_window_cocoa_new          (GstGLAPI gl_api,
-                                                     guintptr external_gl_context);
+                                                     guintptr external_gl_context,
+                                                     GError ** error);
 
 G_END_DECLS
 
diff --git a/gst-libs/gst/gl/cocoa/gstglwindow_cocoa.m b/gst-libs/gst/gl/cocoa/gstglwindow_cocoa.m
index e9e3212..181d822 100755
--- a/gst-libs/gst/gl/cocoa/gstglwindow_cocoa.m
+++ b/gst-libs/gst/gl/cocoa/gstglwindow_cocoa.m
@@ -197,7 +197,7 @@ gst_gl_window_cocoa_init (GstGLWindowCocoa * window)
 
 /* Must be called in the gl thread */
 GstGLWindowCocoa *
-gst_gl_window_cocoa_new (GstGLAPI gl_api, guintptr external_gl_context)
+gst_gl_window_cocoa_new (GstGLAPI gl_api, guintptr external_gl_context, GError ** error)
 {
   GstGLWindowCocoa *window = g_object_new (GST_GL_TYPE_WINDOW_COCOA, NULL);
   GstGLWindowCocoaPrivate *priv = window->priv;
diff --git a/gst-libs/gst/gl/gstglapi.h b/gst-libs/gst/gl/gstglapi.h
index ca98a3e..2e86037 100644
--- a/gst-libs/gst/gl/gstglapi.h
+++ b/gst-libs/gst/gl/gstglapi.h
@@ -42,22 +42,6 @@
 # endif
 #endif
 
-#if HAVE_GLX
-# include <GL/glx.h>
-#endif
-
-#if HAVE_EGL
-# undef UNICODE
-# include <EGL/egl.h>
-# define UNICODE
-#endif
-
-#if HAVE_WGL
-# undef UNICODE
-# include <windows.h>
-# define UNICODE
-#endif
-
 #include <gst/gst.h>
 
 G_BEGIN_DECLS
diff --git a/gst-libs/gst/gl/gstglwindow.c b/gst-libs/gst/gl/gstglwindow.c
index c90fa4a..d323cca 100644
--- a/gst-libs/gst/gl/gstglwindow.c
+++ b/gst-libs/gst/gl/gstglwindow.c
@@ -43,6 +43,12 @@ GST_DEBUG_CATEGORY (GST_CAT_DEFAULT);
 #define gst_gl_window_parent_class parent_class
 G_DEFINE_ABSTRACT_TYPE (GstGLWindow, gst_gl_window, G_TYPE_OBJECT);
 
+GQuark
+gst_gl_window_error_quark (void)
+{
+  return g_quark_from_static_string ("gst-gl-window-error-quark");
+}
+
 static void
 gst_gl_window_init (GstGLWindow * window)
 {
@@ -56,12 +62,14 @@ gst_gl_window_class_init (GstGLWindowClass * klass)
 }
 
 GstGLWindow *
-gst_gl_window_new (GstGLAPI api, guintptr external_gl_context)
+gst_gl_window_new (GstGLAPI api, guintptr external_gl_context, GError ** error)
 {
   GstGLWindow *window = NULL;
   const gchar *user_choice;
   static volatile gsize _init = 0;
 
+  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
   if (g_once_init_enter (&_init)) {
     GST_DEBUG_CATEGORY_INIT (gst_gl_window_debug, "glwindow", 0,
         "glwindow element");
@@ -73,25 +81,39 @@ gst_gl_window_new (GstGLAPI api, guintptr external_gl_context)
 
 #ifdef HAVE_WINDOW_X11
   if (!window && (!user_choice || g_strstr_len (user_choice, 3, "x11")))
-    window = GST_GL_WINDOW (gst_gl_window_x11_new (api, external_gl_context));
+    window =
+        GST_GL_WINDOW (gst_gl_window_x11_new (api, external_gl_context, error));
 #endif
 #ifdef HAVE_WINDOW_WIN32
   if (!window && (!user_choice || g_strstr_len (user_choice, 5, "win32")))
-    window = GST_GL_WINDOW (gst_gl_window_win32_new (api, external_gl_context));
+    window =
+        GST_GL_WINDOW (gst_gl_window_win32_new (api, external_gl_context,
+            error));
 #endif
 #ifdef HAVE_WINDOW_COCOA
   if (!window && (!user_choice || g_strstr_len (user_choice, 5, "cocoa")))
-    window = GST_GL_WINDOW (gst_gl_window_cocoa_new (api, external_gl_context));
+    window =
+        GST_GL_WINDOW (gst_gl_window_cocoa_new (api, external_gl_context,
+            error));
 #endif
 #ifdef HAVE_WINDOW_WAYLAND
   if (!window && (!user_choice || g_strstr_len (user_choice, 7, "wayland")))
     window =
         GST_GL_WINDOW (gst_gl_window_wayland_egl_new (api,
-            external_gl_context));
+            external_gl_context, error));
 #endif
   if (!window) {
-    GST_WARNING ("could not create a window, user choice:%s", user_choice);
-    /* FIXME: set and return a GError */
+    if (error && !*error) {
+      if (user_choice) {
+        g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_FAILED,
+            "Could not create %s window", user_choice);
+      } else {
+        /* subclass did not set an error yet returned a NULL window */
+        g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_FAILED,
+            "Could not create %s window, Unknown Error",
+            user_choice ? user_choice : "");
+      }
+    }
     return NULL;
   }
 
diff --git a/gst-libs/gst/gl/gstglwindow.h b/gst-libs/gst/gl/gstglwindow.h
index 9aec066..f396960 100644
--- a/gst-libs/gst/gl/gstglwindow.h
+++ b/gst-libs/gst/gl/gstglwindow.h
@@ -51,6 +51,14 @@ G_BEGIN_DECLS
 
 #define GST_GL_WINDOW_ERROR (gst_gl_window_error_quark ())
 
+typedef enum
+{
+  GST_GL_WINDOW_ERROR_FAILED,
+  GST_GL_WINDOW_ERROR_WRONG_CONFIG,
+  GST_GL_WINDOW_ERROR_CREATE_CONTEXT,
+  GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE,
+} GstGLWindowError;
+
 typedef void (*GstGLWindowCB) (gpointer data);
 typedef void (*GstGLWindowResizeCB) (gpointer data, guint width, guint height);
 
@@ -106,7 +114,7 @@ struct _GstGLWindowClass {
 GQuark gst_gl_window_error_quark (void);
 GType gst_gl_window_get_type     (void);
 
-GstGLWindow * gst_gl_window_new  (GstGLAPI gl_api, guintptr external_gl_context);
+GstGLWindow * gst_gl_window_new  (GstGLAPI gl_api, guintptr external_gl_context, GError ** error);
 
 void     gst_gl_window_set_draw_callback    (GstGLWindow *window, GstGLWindowCB callback, gpointer data);
 void     gst_gl_window_set_resize_callback  (GstGLWindow *window, GstGLWindowResizeCB callback, gpointer data);
diff --git a/gst-libs/gst/gl/wayland/gstglwindow_wayland_egl.c b/gst-libs/gst/gl/wayland/gstglwindow_wayland_egl.c
index 5f02499..6111379 100644
--- a/gst-libs/gst/gl/wayland/gstglwindow_wayland_egl.c
+++ b/gst-libs/gst/gl/wayland/gstglwindow_wayland_egl.c
@@ -52,7 +52,8 @@ static void gst_gl_window_wayland_egl_send_message (GstGLWindow * window,
 static void gst_gl_window_wayland_egl_destroy_context (GstGLWindowWaylandEGL *
     window_egl);
 static gboolean gst_gl_window_wayland_egl_create_context (GstGLWindowWaylandEGL
-    * window_egl, GstGLAPI gl_api, guintptr external_gl_context);
+    * window_egl, GstGLAPI gl_api, guintptr external_gl_context,
+    GError ** error);
 GstGLAPI gst_gl_window_wayland_egl_get_gl_api (GstGLWindow * window);
 
 static void gst_gl_window_wayland_egl_finalize (GObject * object);
@@ -285,7 +286,8 @@ gst_gl_window_wayland_egl_init (GstGLWindowWaylandEGL * window)
 
 /* Must be called in the gl thread */
 GstGLWindowWaylandEGL *
-gst_gl_window_wayland_egl_new (GstGLAPI gl_api, guintptr external_gl_context)
+gst_gl_window_wayland_egl_new (GstGLAPI gl_api, guintptr external_gl_context,
+    GError ** error)
 {
   GstGLWindowWaylandEGL *window;
 
@@ -296,7 +298,12 @@ gst_gl_window_wayland_egl_new (GstGLAPI gl_api, guintptr external_gl_context)
   gst_gl_window_set_need_lock (GST_GL_WINDOW (window), FALSE);
 
   window->display.display = wl_display_connect (NULL);
-  g_assert (window->display.display);
+  if (!window->display.display) {
+    g_set_error (error, GST_GL_WINDOW_ERROR,
+        GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE,
+        "Failed to connect to Wayland display server");
+    goto error;
+  }
 
   window->display.registry = wl_display_get_registry (window->display.display);
   wl_registry_add_listener (window->display.registry, &registry_listener,
@@ -316,9 +323,16 @@ gst_gl_window_wayland_egl_new (GstGLAPI gl_api, guintptr external_gl_context)
   g_source_attach (window->wl_source, window->main_context);
 
   gst_gl_window_wayland_egl_create_context (window, gl_api,
-      external_gl_context);
+      external_gl_context, error);
 
   return window;
+
+error:
+  {
+    if (window)
+      g_object_unref (window);
+    return NULL;
+  }
 }
 
 static void
@@ -330,7 +344,9 @@ gst_gl_window_wayland_egl_finalize (GObject * object)
 
   gst_gl_window_wayland_egl_destroy_context (window_egl);
 
-  wl_surface_destroy (window_egl->display.cursor_surface);
+  if (window_egl->display.cursor_surface)
+    wl_surface_destroy (window_egl->display.cursor_surface);
+
   if (window_egl->display.cursor_theme)
     wl_cursor_theme_destroy (window_egl->display.cursor_theme);
 
@@ -340,15 +356,17 @@ gst_gl_window_wayland_egl_finalize (GObject * object)
   if (window_egl->display.compositor)
     wl_compositor_destroy (window_egl->display.compositor);
 
-  wl_display_flush (window_egl->display.display);
-  wl_display_disconnect (window_egl->display.display);
+  if (window_egl->display.display) {
+    wl_display_flush (window_egl->display.display);
+    wl_display_disconnect (window_egl->display.display);
+  }
 
   G_OBJECT_CLASS (parent_class)->finalize (object);
 }
 
 static gboolean
 gst_gl_window_wayland_egl_create_context (GstGLWindowWaylandEGL * window_egl,
-    GstGLAPI gl_api, guintptr external_gl_context)
+    GstGLAPI gl_api, guintptr external_gl_context, GError ** error)
 {
   EGLint config_attrib[] = {
     EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
@@ -376,13 +394,15 @@ gst_gl_window_wayland_egl_create_context (GstGLWindowWaylandEGL * window_egl,
   if (eglInitialize (window_egl->egl_display, &majorVersion, &minorVersion))
     GST_DEBUG ("egl initialized: %d.%d", majorVersion, minorVersion);
   else {
-    GST_DEBUG ("failed to initialize egl %ld, %s",
-        (gulong) window_egl->egl_display, WlEGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR,
+        GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE,
+        "Failed to initialize egl: %s", WlEGLErrorString ());
     goto failure;
   }
 
   if (!eglBindAPI (EGL_OPENGL_ES_API)) {
-    GST_WARNING ("failed to bind OpenGL|ES API");
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_FAILED,
+        "Failed to bind OpenGL|ES API: %s", WlEGLErrorString ());
     goto failure;
   }
 
@@ -391,8 +411,8 @@ gst_gl_window_wayland_egl_create_context (GstGLWindowWaylandEGL * window_egl,
     GST_DEBUG ("config set: %ld, %ld", (gulong) window_egl->egl_config,
         (gulong) numConfigs);
   else {
-    GST_DEBUG ("failed to set config %ld, %s", (gulong) window_egl->egl_display,
-        WlEGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_WRONG_CONFIG,
+        "Failed to set window configuration: %s", WlEGLErrorString ());
     goto failure;
   }
 
@@ -405,9 +425,8 @@ gst_gl_window_wayland_egl_create_context (GstGLWindowWaylandEGL * window_egl,
   if (window_egl->egl_context != EGL_NO_CONTEXT)
     GST_DEBUG ("gl context created: %ld", (gulong) window_egl->egl_context);
   else {
-    GST_DEBUG ("failed to create glcontext %ld, %ld, %s",
-        (gulong) window_egl->egl_context, (gulong) window_egl->egl_display,
-        WlEGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_CREATE_CONTEXT,
+        "Failed to create a OpenGL context: %s", WlEGLErrorString ());
     goto failure;
   }
 
diff --git a/gst-libs/gst/gl/wayland/gstglwindow_wayland_egl.h b/gst-libs/gst/gl/wayland/gstglwindow_wayland_egl.h
index 042ff03..af1ad10 100644
--- a/gst-libs/gst/gl/wayland/gstglwindow_wayland_egl.h
+++ b/gst-libs/gst/gl/wayland/gstglwindow_wayland_egl.h
@@ -25,7 +25,8 @@
 #include <wayland-egl.h>
 #include <wayland-cursor.h>
 
-#include "gstglapi.h"
+#include <EGL/egl.h>
+
 #include "gstglwindow.h"
 
 G_BEGIN_DECLS
@@ -99,7 +100,8 @@ struct _GstGLWindowWaylandEGLClass {
 GType gst_gl_window_wayland_egl_get_type     (void);
 
 GstGLWindowWaylandEGL * gst_gl_window_wayland_egl_new  (GstGLAPI gl_api,
-                                                        guintptr external_gl_context);
+                                                        guintptr external_gl_context,
+                                                        GError ** error);
 
 G_END_DECLS
 
diff --git a/gst-libs/gst/gl/win32/gstglwindow_win32.c b/gst-libs/gst/gl/win32/gstglwindow_win32.c
index 795eca9..d4ed0dd 100644
--- a/gst-libs/gst/gl/win32/gstglwindow_win32.c
+++ b/gst-libs/gst/gl/win32/gstglwindow_win32.c
@@ -53,6 +53,7 @@ struct _GstGLWindowWin32Private
 {
   GstGLAPI gl_api;
   guintptr external_gl_context;
+  GError **error;
   gboolean activate;
   gboolean activate_result;
 };
@@ -138,7 +139,8 @@ gst_gl_window_win32_init (GstGLWindowWin32 * window)
 
 /* Must be called in the gl thread */
 GstGLWindowWin32 *
-gst_gl_window_win32_new (GstGLAPI gl_api, guintptr external_gl_context)
+gst_gl_window_win32_new (GstGLAPI gl_api, guintptr external_gl_context,
+    GError ** error)
 {
   GstGLWindowWin32 *window = NULL;
   const gchar *user_choice;
@@ -149,28 +151,30 @@ gst_gl_window_win32_new (GstGLAPI gl_api, guintptr external_gl_context)
   if (!window && (!user_choice || g_strstr_len (user_choice, 3, "wgl")))
     window =
         GST_GL_WINDOW_WIN32 (gst_gl_window_win32_wgl_new (gl_api,
-            external_gl_context));
+            external_gl_context, error));
 #endif
 #if HAVE_EGL
   if (!window && (!user_choice || g_strstr_len (user_choice, 3, "egl")))
     window =
         GST_GL_WINDOW_WIN32 (gst_gl_window_win32_egl_new (gl_api,
-            external_gl_context));
+            external_gl_context, error));
 #endif
   if (!window) {
-    GST_WARNING ("Failed to create x11 window, user_choice:%s",
+    GST_WARNING ("Failed to create win32 window, user_choice:%s",
         user_choice ? user_choice : "NULL");
     return NULL;
   }
 
   window->priv->gl_api = gl_api;
   window->priv->external_gl_context = external_gl_context;
+  window->priv->error = error;
 
   return window;
 }
 
 gboolean
-gst_gl_window_win32_open_device (GstGLWindowWin32 * window_win32)
+gst_gl_window_win32_open_device (GstGLWindowWin32 * window_win32,
+    GError ** error)
 {
   HINSTANCE hinstance = GetModuleHandle (NULL);
 
@@ -261,7 +265,7 @@ gst_gl_window_win32_set_window_handle (GstGLWindow * window, guintptr id)
 
   window_win32 = GST_GL_WINDOW_WIN32 (window);
 
-  //retrieve parent if previously set
+  /* retrieve parent if previously set */
   parent_id = GetProp (window_win32->internal_win_id, "gl_window_parent_id");
 
   if (window_win32->visible) {
@@ -299,7 +303,7 @@ gst_gl_window_win32_set_window_handle (GstGLWindow * window, guintptr id)
         WS_CHILD | WS_MAXIMIZE);
     SetParent (window_win32->internal_win_id, (HWND) id);
 
-    //take changes into account: SWP_FRAMECHANGED
+    /* take changes into account: SWP_FRAMECHANGED */
     GetClientRect ((HWND) id, &rect);
     SetWindowPos (window_win32->internal_win_id, HWND_TOP, rect.left, rect.top,
         rect.right, rect.bottom,
@@ -308,7 +312,7 @@ gst_gl_window_win32_set_window_handle (GstGLWindow * window, guintptr id)
     MoveWindow (window_win32->internal_win_id, rect.left, rect.top, rect.right,
         rect.bottom, FALSE);
   } else {
-    //no parent so the internal window needs borders and system menu
+    /* no parent so the internal window needs borders and system menu */
     SetWindowLongPtr (window_win32->internal_win_id, GWL_STYLE,
         WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_OVERLAPPEDWINDOW);
   }
@@ -427,7 +431,7 @@ window_proc (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
       window_class->choose_format (window_win32);
 
       window_class->create_context (window_win32, priv->gl_api,
-          priv->external_gl_context);
+          priv->external_gl_context, priv->error);
 
 /*      priv->gl_context = wglCreateContext (priv->device);
       if (priv->gl_context)
diff --git a/gst-libs/gst/gl/win32/gstglwindow_win32.h b/gst-libs/gst/gl/win32/gstglwindow_win32.h
index cd62b8b..526b05b 100644
--- a/gst-libs/gst/gl/win32/gstglwindow_win32.h
+++ b/gst-libs/gst/gl/win32/gstglwindow_win32.h
@@ -21,7 +21,6 @@
 #ifndef __GST_GL_WINDOW_WIN32_H__
 #define __GST_GL_WINDOW_WIN32_H__
 
-#include "gstglapi.h"
 #include "gstglwindow.h"
 
 #undef UNICODE
@@ -61,8 +60,8 @@ struct _GstGLWindowWin32Class {
   GstGLWindowClass parent_class;
 
   gboolean (*choose_format)     (GstGLWindowWin32 *window);
-  gboolean (*create_context)    (GstGLWindowWin32 *window, GstGLRendererAPI render_api,
-                                 guintptr external_gl_context);
+  gboolean (*create_context)    (GstGLWindowWin32 *window, GstGLAPI gl_api,
+                                 guintptr external_gl_context, GError ** error);
   gboolean (*share_context)     (GstGLWindowWin32 *window, guintptr external_gl_context);
   void     (*swap_buffers)      (GstGLWindowWin32 *window);
   gboolean (*activate)          (GstGLWindowWin32 *window, gboolean activate);
@@ -76,8 +75,8 @@ struct _GstGLWindowWin32Class {
 GType gst_gl_window_win32_get_type     (void);
 
 GstGLWindowWin32 * gst_gl_window_win32_new          (GstGLAPI gl_api,
-                                                     guintptr external_gl_context);
-gboolean         gst_gl_window_win32_open_device  (GstGLWindowWin32 *window_win32);
+                                                     guintptr external_gl_context, GError ** error);
+gboolean         gst_gl_window_win32_open_device  (GstGLWindowWin32 *window_win32, GError ** error);
 
 G_END_DECLS
 
diff --git a/gst-libs/gst/gl/win32/gstglwindow_win32_egl.c b/gst-libs/gst/gl/win32/gstglwindow_win32_egl.c
index 84fa9cb..7508b0f 100644
--- a/gst-libs/gst/gl/win32/gstglwindow_win32_egl.c
+++ b/gst-libs/gst/gl/win32/gstglwindow_win32_egl.c
@@ -36,21 +36,19 @@ static gboolean gst_gl_window_win32_wgl_choose_format (GstGLWindowWin32 *
 static gboolean gst_gl_window_win32_wgl_activate (GstGLWindowWin32 *
     window_win32, gboolean activate);
 static gboolean gst_gl_window_win32_wgl_create_context (GstGLWindowWin32 *
-    window_win32, GstGLAPI gl_api, guintptr external_gl_context);
+    window_win32, GstGLAPI gl_api, guintptr external_gl_context,
+    GError ** error);
 static void gst_gl_window_win32_wgl_destroy_context (GstGLWindowWin32 *
     window_win32);
 GstGLAPI gst_gl_window_win32_egl_get_gl_api (GstGLWindow * window);
 
 const gchar *WinEGLErrorString ();
 
-#define GST_CAT_DEFAULT gst_gl_window_win32_egl_debug
-GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
+#define GST_CAT_DEFAULT gst_gl_window_debug
 
-#define DEBUG_INIT \
-  GST_DEBUG_CATEGORY_GET (GST_CAT_DEFAULT, "glwindow");
 #define gst_gl_window_win32_wgl_parent_class parent_class
-G_DEFINE_TYPE_WITH_CODE (GstGLWindowWin32EGL, gst_gl_window_win32_egl,
-    GST_GL_TYPE_WINDOW, DEBUG_INIT);
+G_DEFINE_TYPE (GstGLWindowWin32EGL, gst_gl_window_win32_egl,
+    GST_GL_TYPE_WINDOW);
 
 static void
 gst_gl_window_win32_egl_class_init (GstGLWindowWin32EGLClass * klass)
@@ -82,12 +80,13 @@ gst_gl_window_win32_egl_init (GstGLWindow * window)
 
 /* Must be called in the gl thread */
 GstGLWindowWin32EGL *
-gst_gl_window_win32_egl_new (GstGLAPI gl_api, guintptr external_gl_context)
+gst_gl_window_win32_egl_new (GstGLAPI gl_api, guintptr external_gl_context,
+    GError ** error)
 {
   GstGLWindowWin32EGL *window =
       g_object_new (GST_GL_TYPE_WINDOW_WIN32_EGL, NULL);
 
-  gst_gl_window_win32_open_device (GST_GL_WINDOW_WIN32 (window));
+  gst_gl_window_win32_open_device (GST_GL_WINDOW_WIN32 (window), error);
 
   return window;
 }
@@ -95,7 +94,8 @@ gst_gl_window_win32_egl_new (GstGLAPI gl_api, guintptr external_gl_context)
 guintptr
 gst_gl_window_win32_egl_get_gl_context (GstGLWindowWin32 * window_win32)
 {
-return (guintptr) GST_GL_WINDOW_WIN32_EGL (window_win32)->wgl_context}
+  return (guintptr) GST_GL_WINDOW_WIN32_EGL (window_win32)->wgl_context;
+}
 
 static gboolean
 gst_gl_window_win32_egl_activate (GstGLWindowWin32 * window_win32,
@@ -119,7 +119,7 @@ gst_gl_window_win32_egl_activate (GstGLWindowWin32 * window_win32,
 
 static gboolean
 gst_gl_window_win32_egl_create_context (GstGLWindowWin32 * window_win32,
-    GstGLAPI gl_api, guintptr external_gl_context)
+    GstGLAPI gl_api, guintptr external_gl_context, GError ** error)
 {
   GstGLWindowWin32EGL *window_egl;
   EGLint majorVersion;
@@ -144,33 +144,36 @@ gst_gl_window_win32_egl_create_context (GstGLWindowWin32 * window_win32,
 
   window_egl->display = eglGetDisplay (window_win32->device);
   if (priv->display != EGL_NO_DISPLAY)
-    GST_DEBUG ("display retrieved: %d\n", window_egl->display);
+    GST_DEBUG ("display retrieved: %d", window_egl->display);
   else {
-    GST_DEBUG ("failed to retrieve display %s\n", WinEGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR,
+        GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE,
+        "failed to retrieve display: %s", WinEGLErrorString ());
     goto failure;
   }
 
   if (eglInitialize (priv->display, &majorVersion, &minorVersion))
-    GST_DEBUG ("egl initialized: %d.%d\n", majorVersion, minorVersion);
+    GST_DEBUG ("egl initialized: %d.%d", majorVersion, minorVersion);
   else {
-    GST_DEBUG ("failed to initialize egl %d, %s\n", priv->display,
-        WinEGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR,
+        GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE,
+        "failed to initialize egl: %s", WinEGLErrorString ());
     goto failure;
   }
 
   if (eglGetConfigs (window_egl->display, NULL, 0, &numConfigs))
-    GST_DEBUG ("configs retrieved: %d\n", numConfigs);
+    GST_DEBUG ("configs retrieved: %d", numConfigs);
   else {
-    GST_DEBUG ("failed to retrieve configs %d, %s\n", window_egl->display,
-        WinEGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_WRONG_CONFIG,
+        "failed to retrieve configs %s", WinEGLErrorString ());
     goto failure;
   }
 
   if (eglChooseConfig (priv->display, attribList, &config, 1, &numConfigs))
-    GST_DEBUG ("config set: %d, %d\n", config, numConfigs);
+    GST_DEBUG ("config set: %d, %d", config, numConfigs);
   else {
-    GST_DEBUG ("failed to set config %d, %s\n", window_egl->display,
-        WinEGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_WRONG_CONFIG,
+        "failed to set config %s", WinEGLErrorString ());
     goto failure;
   }
 
@@ -178,10 +181,10 @@ gst_gl_window_win32_egl_create_context (GstGLWindowWin32 * window_win32,
       eglCreateWindowSurface (window_egl->display, config,
       (EGLNativeWindowType) WindowFromDC (window_win32->device), NULL);
   if (priv->surface != EGL_NO_SURFACE)
-    GST_DEBUG ("surface created: %d\n", window_egl->surface);
+    GST_DEBUG ("surface created: %d", window_egl->surface);
   else {
-    GST_DEBUG ("failed to create surface %d, %d, %s\n", window_egl->display,
-        window_egl->surface, WinEGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_CREATE_CONTEXT,
+        "failed to create surface %s", WinEGLErrorString ());
     goto failure;
   }
 
@@ -189,13 +192,12 @@ gst_gl_window_win32_egl_create_context (GstGLWindowWin32 * window_win32,
       eglCreateContext (window_egl->display, config, external_gl_context,
       contextAttribs);
   if (window_egl->egl_context != EGL_NO_CONTEXT)
-    GST_DEBUG ("gl context created: %lud, external: %lud\n",
+    GST_DEBUG ("gl context created: %lud, external: %lud",
         (gulong) window_egl->egl_context, (gulong) external_gl_context);
   else {
-    GST_DEBUG
-        ("failed to create glcontext %lud, extenal: %lud, %s\n",
-        (gulong) window_egl->egl_context, (gulong) external_gl_context,
-        WinEGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_CREATE_CONTEXT,
+        "failed to create glcontext with external: %lud, %s",
+        (gulong) external_gl_context, WinEGLErrorString ());
     goto failure;
   }
 
diff --git a/gst-libs/gst/gl/win32/gstglwindow_win32_egl.h b/gst-libs/gst/gl/win32/gstglwindow_win32_egl.h
index 5e17813..c82c9e0 100644
--- a/gst-libs/gst/gl/win32/gstglwindow_win32_egl.h
+++ b/gst-libs/gst/gl/win32/gstglwindow_win32_egl.h
@@ -23,7 +23,8 @@
 
 #include <gst/gst.h>
 
-#include "gstglapi.h"
+#include <EGL/egl.h>
+
 #include "gstglwindow_win32.h"
 
 G_BEGIN_DECLS
@@ -62,7 +63,7 @@ struct _GstGLWindowWin32EGLClass {
 GType gst_gl_window_win32_egl_get_type     (void);
 
 GstGLWindowWin32EGL * gst_gl_window_win32_egl_new  (GstGLAPI gl_api,
-                                                    guintptr external_gl_context);
+                                                    guintptr external_gl_context, GError ** error);
 
 G_END_DECLS
 
diff --git a/gst-libs/gst/gl/win32/gstglwindow_win32_wgl.c b/gst-libs/gst/gl/win32/gstglwindow_win32_wgl.c
index 2273508..8e7b67e 100644
--- a/gst-libs/gst/gl/win32/gstglwindow_win32_wgl.c
+++ b/gst-libs/gst/gl/win32/gstglwindow_win32_wgl.c
@@ -29,14 +29,11 @@
 
 #include "gstglwindow_win32_wgl.h"
 
-#define GST_CAT_DEFAULT gst_gl_window_win32_wgl_debug
-GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
+#define GST_CAT_DEFAULT gst_gl_window_debug
 
-#define DEBUG_INIT \
-  GST_DEBUG_CATEGORY_GET (GST_CAT_DEFAULT, "glwindow");
 #define gst_gl_window_win32_wgl_parent_class parent_class
-G_DEFINE_TYPE_WITH_CODE (GstGLWindowWin32WGL, gst_gl_window_win32_wgl,
-    GST_GL_TYPE_WINDOW_WIN32, DEBUG_INIT);
+G_DEFINE_TYPE (GstGLWindowWin32WGL, gst_gl_window_win32_wgl,
+    GST_GL_TYPE_WINDOW_WIN32);
 
 static guintptr gst_gl_window_win32_wgl_get_gl_context (GstGLWindowWin32 *
     window_win32);
@@ -47,7 +44,8 @@ static gboolean gst_gl_window_win32_wgl_choose_format (GstGLWindowWin32 *
 static gboolean gst_gl_window_win32_wgl_activate (GstGLWindowWin32 *
     window_win32, gboolean activate);
 static gboolean gst_gl_window_win32_wgl_create_context (GstGLWindowWin32 *
-    window_win32, GstGLAPI gl_api, guintptr external_gl_context);
+    window_win32, GstGLAPI gl_api, guintptr external_gl_context,
+    GError ** error);
 static void gst_gl_window_win32_wgl_destroy_context (GstGLWindowWin32 *
     window_win32);
 GstGLAPI gst_gl_window_win32_wgl_get_gl_api (GstGLWindow * window);
@@ -55,7 +53,7 @@ GstGLAPI gst_gl_window_win32_wgl_get_gl_api (GstGLWindow * window);
 static void
 gst_gl_window_win32_wgl_class_init (GstGLWindowWin32WGLClass * klass)
 {
-  GstGLWindowClass *window_class;
+  GstGLWindowClass *window_class = (GstGLWindowClass *) klass;
   GstGLWindowWin32Class *window_win32_class = (GstGLWindowWin32Class *) klass;
 
   window_win32_class->get_gl_context =
@@ -82,19 +80,20 @@ gst_gl_window_win32_wgl_init (GstGLWindowWin32WGL * window)
 
 /* Must be called in the gl thread */
 GstGLWindowWin32WGL *
-gst_gl_window_win32_wgl_new (GstGLAPI gl_api, guintptr external_gl_context)
+gst_gl_window_win32_wgl_new (GstGLAPI gl_api, guintptr external_gl_context,
+    GError ** error)
 {
   GstGLWindowWin32WGL *window =
       g_object_new (GST_GL_TYPE_WINDOW_WIN32_WGL, NULL);
 
-  gst_gl_window_win32_open_device (GST_GL_WINDOW_WIN32 (window));
+  gst_gl_window_win32_open_device (GST_GL_WINDOW_WIN32 (window), error);
 
   return window;
 }
 
 static gboolean
 gst_gl_window_win32_wgl_create_context (GstGLWindowWin32 * window_win32,
-    GstGLAPI gl_api, guintptr external_gl_context)
+    GstGLAPI gl_api, guintptr external_gl_context, GError ** error)
 {
   GstGLWindowWin32WGL *window_wgl;
 
@@ -102,10 +101,11 @@ gst_gl_window_win32_wgl_create_context (GstGLWindowWin32 * window_win32,
 
   window_wgl->wgl_context = wglCreateContext (window_win32->device);
   if (window_wgl->wgl_context)
-    GST_DEBUG ("gl context created: %" G_GUINTPTR_FORMAT "\n",
+    GST_DEBUG ("gl context created: %" G_GUINTPTR_FORMAT,
         (guintptr) window_wgl->wgl_context);
   else {
-    GST_DEBUG ("failed to create glcontext:%lud\n", GetLastError ());
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_CREATE_CONTEXT,
+        "failed to create glcontext:%lu", GetLastError ());
     goto failure;
   }
   g_assert (window_wgl->wgl_context);
@@ -125,8 +125,8 @@ gst_gl_window_win32_wgl_destroy_context (GstGLWindowWin32 * window_win32)
 
   window_wgl = GST_GL_WINDOW_WIN32_WGL (window_win32);
 
-  wglDeleteContext (window_wgl->wgl_context);
-
+  if (window_wgl->wgl_context)
+    wglDeleteContext (window_wgl->wgl_context);
   window_wgl->wgl_context = 0;
 }
 
diff --git a/gst-libs/gst/gl/win32/gstglwindow_win32_wgl.h b/gst-libs/gst/gl/win32/gstglwindow_win32_wgl.h
index 9a6506e..b28a5a1 100644
--- a/gst-libs/gst/gl/win32/gstglwindow_win32_wgl.h
+++ b/gst-libs/gst/gl/win32/gstglwindow_win32_wgl.h
@@ -21,7 +21,6 @@
 #ifndef __GST_GL_WINDOW_WIN32_WGL_H__
 #define __GST_GL_WINDOW_WIN32_WGL_H__
 
-#include "gstglapi.h"
 #include "gstglwindow_win32.h"
 
 G_BEGIN_DECLS
@@ -57,7 +56,7 @@ struct _GstGLWindowWin32WGLClass {
 GType gst_gl_window_win32_wgl_get_type     (void);
 
 GstGLWindowWin32WGL * gst_gl_window_win32_wgl_new  (GstGLAPI gl_api,
-                                                    guintptr external_gl_context);
+                                                    guintptr external_gl_context, GError ** error);
 
 G_END_DECLS
 
diff --git a/gst-libs/gst/gl/x11/gstglwindow_x11.c b/gst-libs/gst/gl/x11/gstglwindow_x11.c
index 19c5e01..569d59e 100644
--- a/gst-libs/gst/gl/x11/gstglwindow_x11.c
+++ b/gst-libs/gst/gl/x11/gstglwindow_x11.c
@@ -40,14 +40,10 @@
 #define GST_GL_WINDOW_X11_GET_PRIVATE(o)  \
   (G_TYPE_INSTANCE_GET_PRIVATE((o), GST_GL_TYPE_WINDOW_X11, GstGLWindowX11Private))
 
-#define GST_CAT_DEFAULT gst_gl_window_x11_debug
-GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
+#define GST_CAT_DEFAULT gst_gl_window_debug
 
-#define DEBUG_INIT \
-  GST_DEBUG_CATEGORY_GET (GST_CAT_DEFAULT, "glwindow");
 #define gst_gl_window_x11_parent_class parent_class
-G_DEFINE_TYPE_WITH_CODE (GstGLWindowX11, gst_gl_window_x11, GST_GL_TYPE_WINDOW,
-    DEBUG_INIT);
+G_DEFINE_TYPE (GstGLWindowX11, gst_gl_window_x11, GST_GL_TYPE_WINDOW);
 
 enum
 {
@@ -213,7 +209,8 @@ gst_gl_window_x11_init (GstGLWindowX11 * window)
 
 /* Must be called in the gl thread */
 GstGLWindowX11 *
-gst_gl_window_x11_new (GstGLAPI gl_api, guintptr external_gl_context)
+gst_gl_window_x11_new (GstGLAPI gl_api, guintptr external_gl_context,
+    GError ** error)
 {
   GstGLWindowX11 *window = NULL;
   const gchar *user_choice;
@@ -229,35 +226,35 @@ gst_gl_window_x11_new (GstGLAPI gl_api, guintptr external_gl_context)
             || g_strstr_len (user_choice, 3, "glx") != NULL))
       window =
           GST_GL_WINDOW_X11 (gst_gl_window_x11_glx_new (gl_api,
-              external_gl_context));
+              external_gl_context, error));
     if (!window && (!user_choice
             || g_strstr_len (user_choice, 3, "egl") != NULL))
       window =
           GST_GL_WINDOW_X11 (gst_gl_window_x11_egl_new (gl_api,
-              external_gl_context));
+              external_gl_context, error));
   } else {                      /* try EGL first for OpenGL|ES */
     if (!window && (!user_choice
             || g_strstr_len (user_choice, 3, "egl") != NULL))
       window =
           GST_GL_WINDOW_X11 (gst_gl_window_x11_egl_new (gl_api,
-              external_gl_context));
+              external_gl_context, error));
     if (!window && (!user_choice
             || g_strstr_len (user_choice, 3, "glx") != NULL))
       window =
           GST_GL_WINDOW_X11 (gst_gl_window_x11_glx_new (gl_api,
-              external_gl_context));
+              external_gl_context, error));
   }
 #endif /* HAVE_EGL */
   if (!window && (!user_choice || g_strstr_len (user_choice, 3, "glx") != NULL))
     window =
         GST_GL_WINDOW_X11 (gst_gl_window_x11_glx_new (gl_api,
-            external_gl_context));
+            external_gl_context, error));
 #endif /* HAVE_GLX */
 #ifdef HAVE_EGL
   if (!window && (!user_choice || g_strstr_len (user_choice, 3, "egl") != NULL))
     window =
         GST_GL_WINDOW_X11 (gst_gl_window_x11_egl_new (gl_api,
-            external_gl_context));
+            external_gl_context, error));
 #endif /* HAVE_EGL */
   if (!window) {
     GST_WARNING ("Failed to create x11 window, user_choice:%s",
@@ -270,7 +267,7 @@ gst_gl_window_x11_new (GstGLAPI gl_api, guintptr external_gl_context)
 
 gboolean
 gst_gl_window_x11_open_device (GstGLWindowX11 * window_x11,
-    GstGLAPI gl_api, guintptr external_gl_context)
+    GstGLAPI gl_api, guintptr external_gl_context, GError ** error)
 {
   GstGLWindowX11Class *window_class = GST_GL_WINDOW_X11_GET_CLASS (window_x11);
 
@@ -288,7 +285,9 @@ gst_gl_window_x11_open_device (GstGLWindowX11 * window_x11,
 
   window_x11->device = XOpenDisplay (window_x11->display_name);
   if (window_x11->device == NULL) {
-    GST_WARNING ("Failed to open X display");
+    g_set_error (error, GST_GL_WINDOW_ERROR,
+        GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE,
+        "Failed to connect to X display server");
     goto failure;
   }
 
@@ -320,20 +319,20 @@ gst_gl_window_x11_open_device (GstGLWindowX11 * window_x11,
 
   window_x11->connection = ConnectionNumber (window_x11->device);
 
-  if (!window_class->choose_format (window_x11)) {
-    GST_WARNING ("Failed to choose XVisual");
+  if (!window_class->choose_format (window_x11, error)) {
     goto failure;
   }
 
   gst_gl_window_x11_create_window (window_x11);
 
-  if (!window_class->create_context (window_x11, gl_api, external_gl_context)) {
-    GST_WARNING ("Failed to create context");
+  if (!window_class->create_context (window_x11, gl_api, external_gl_context,
+          error)) {
     goto failure;
   }
 
   if (!window_class->activate (window_x11, TRUE)) {
-    GST_WARNING ("failed to make context current");
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_CREATE_CONTEXT,
+        "Failed to make context current");
     goto failure;
   }
 
@@ -645,13 +644,13 @@ gst_gl_window_x11_run (GstGLWindow * window)
           if (window_x11->running) {
 #if SIZEOF_VOID_P == 8
             GstGLWindowCB custom_cb =
-                (GstGLWindowCB) (((event.xclient.
-                        data.l[0] & 0xffffffff) << 32) | (event.xclient.
-                    data.l[1] & 0xffffffff));
+                (GstGLWindowCB) (((event.xclient.data.
+                        l[0] & 0xffffffff) << 32) | (event.xclient.data.
+                    l[1] & 0xffffffff));
             gpointer custom_data =
-                (gpointer) (((event.xclient.
-                        data.l[2] & 0xffffffff) << 32) | (event.xclient.
-                    data.l[3] & 0xffffffff));
+                (gpointer) (((event.xclient.data.
+                        l[2] & 0xffffffff) << 32) | (event.xclient.data.
+                    l[3] & 0xffffffff));
 #else
             GstGLWindowCB custom_cb = (GstGLWindowCB) event.xclient.data.l[0];
             gpointer custom_data = (gpointer) event.xclient.data.l[1];
@@ -680,13 +679,13 @@ gst_gl_window_x11_run (GstGLWindow * window)
             && event.xclient.message_type == wm_quit_loop) {
 #if SIZEOF_VOID_P == 8
           GstGLWindowCB destroy_cb =
-              (GstGLWindowCB) (((event.xclient.
-                      data.l[0] & 0xffffffff) << 32) | (event.xclient.
-                  data.l[1] & 0xffffffff));
+              (GstGLWindowCB) (((event.xclient.data.
+                      l[0] & 0xffffffff) << 32) | (event.xclient.data.
+                  l[1] & 0xffffffff));
           gpointer destroy_data =
-              (gpointer) (((event.xclient.
-                      data.l[2] & 0xffffffff) << 32) | (event.xclient.
-                  data.l[3] & 0xffffffff));
+              (gpointer) (((event.xclient.data.
+                      l[2] & 0xffffffff) << 32) | (event.xclient.data.
+                  l[3] & 0xffffffff));
 #else
           GstGLWindowCB destroy_cb = (GstGLWindowCB) event.xclient.data.l[0];
           gpointer destroy_data = (gpointer) event.xclient.data.l[1];
@@ -704,13 +703,13 @@ gst_gl_window_x11_run (GstGLWindow * window)
                   &pending_event)) {
 #if SIZEOF_VOID_P == 8
             GstGLWindowCB custom_cb =
-                (GstGLWindowCB) (((event.xclient.
-                        data.l[0] & 0xffffffff) << 32) | (event.xclient.
-                    data.l[1] & 0xffffffff));
+                (GstGLWindowCB) (((event.xclient.data.
+                        l[0] & 0xffffffff) << 32) | (event.xclient.data.
+                    l[1] & 0xffffffff));
             gpointer custom_data =
-                (gpointer) (((event.xclient.
-                        data.l[2] & 0xffffffff) << 32) | (event.xclient.
-                    data.l[3] & 0xffffffff));
+                (gpointer) (((event.xclient.data.
+                        l[2] & 0xffffffff) << 32) | (event.xclient.data.
+                    l[3] & 0xffffffff));
 #else
             GstGLWindowCB custom_cb = (GstGLWindowCB) event.xclient.data.l[0];
             gpointer custom_data = (gpointer) event.xclient.data.l[1];
@@ -727,7 +726,7 @@ gst_gl_window_x11_run (GstGLWindow * window)
 
           /* Finally we can destroy opengl ressources (texture/shaders/fbo) */
           if (!destroy_cb || !destroy_data)
-            GST_DEBUG ("destroy cb not correctly set");
+            GST_FIXME ("destroy cb not correctly set");
 
           destroy_cb (destroy_data);
 
diff --git a/gst-libs/gst/gl/x11/gstglwindow_x11.h b/gst-libs/gst/gl/x11/gstglwindow_x11.h
index df3f9d5..07722db 100644
--- a/gst-libs/gst/gl/x11/gstglwindow_x11.h
+++ b/gst-libs/gst/gl/x11/gstglwindow_x11.h
@@ -81,9 +81,9 @@ struct _GstGLWindowX11Class {
   /*< private >*/
   GstGLWindowClass parent_class;
 
-  gboolean (*choose_format)    (GstGLWindowX11 *window);
+  gboolean (*choose_format)    (GstGLWindowX11 *window, GError ** error);
   gboolean (*create_context)   (GstGLWindowX11 *window, GstGLAPI gl_api,
-                                guintptr external_gl_context);
+                                guintptr external_gl_context, GError ** error);
   void     (*swap_buffers)     (GstGLWindowX11 *window);
   gboolean (*activate)         (GstGLWindowX11 *window, gboolean activate);
   void     (*destroy_context)  (GstGLWindowX11 *window);
@@ -96,10 +96,12 @@ struct _GstGLWindowX11Class {
 GType gst_gl_window_x11_get_type     (void);
 
 GstGLWindowX11 * gst_gl_window_x11_new          (GstGLAPI gl_api,
-                                                 guintptr external_gl_context);
+                                                 guintptr external_gl_context,
+                                                 GError ** error);
 gboolean         gst_gl_window_x11_open_device  (GstGLWindowX11 *window_x11,
                                                  GstGLAPI gl_api,
-                                                 guintptr external_gl_context);
+                                                 guintptr external_gl_context,
+                                                 GError ** error);
 
 G_END_DECLS
 
diff --git a/gst-libs/gst/gl/x11/gstglwindow_x11_egl.c b/gst-libs/gst/gl/x11/gstglwindow_x11_egl.c
index 18595c2..3a444d0 100644
--- a/gst-libs/gst/gl/x11/gstglwindow_x11_egl.c
+++ b/gst-libs/gst/gl/x11/gstglwindow_x11_egl.c
@@ -29,14 +29,11 @@
 
 const gchar *X11EGLErrorString ();
 
-#define GST_CAT_DEFAULT gst_gl_window_x11_egl_debug
-GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
+#define GST_CAT_DEFAULT gst_gl_window_debug
 
-#define DEBUG_INIT \
-  GST_DEBUG_CATEGORY_GET (GST_CAT_DEFAULT, "glwindow");
 #define gst_gl_window_x11_egl_parent_class parent_class
-G_DEFINE_TYPE_WITH_CODE (GstGLWindowX11EGL, gst_gl_window_x11_egl,
-    GST_GL_TYPE_WINDOW_X11, DEBUG_INIT);
+G_DEFINE_TYPE (GstGLWindowX11EGL, gst_gl_window_x11_egl,
+    GST_GL_TYPE_WINDOW_X11);
 
 static guintptr gst_gl_window_x11_egl_get_gl_context (GstGLWindowX11 *
     window_x11);
@@ -44,10 +41,10 @@ static void gst_gl_window_x11_egl_swap_buffers (GstGLWindowX11 * window_x11);
 static gboolean gst_gl_window_x11_egl_activate (GstGLWindowX11 * window_x11,
     gboolean activate);
 static gboolean gst_gl_window_x11_egl_create_context (GstGLWindowX11 *
-    window_x11, GstGLAPI gl_api, guintptr external_gl_context);
+    window_x11, GstGLAPI gl_api, guintptr external_gl_context, GError ** error);
 static void gst_gl_window_x11_egl_destroy_context (GstGLWindowX11 * window_x11);
 static gboolean gst_gl_window_x11_egl_choose_format (GstGLWindowX11 *
-    window_x11);
+    window_x11, GError ** error);
 GstGLAPI gst_gl_window_x11_egl_get_gl_api (GstGLWindow * window);
 
 static void
@@ -80,18 +77,20 @@ gst_gl_window_x11_egl_init (GstGLWindowX11EGL * window)
 
 /* Must be called in the gl thread */
 GstGLWindowX11EGL *
-gst_gl_window_x11_egl_new (GstGLAPI gl_api, guintptr external_gl_context)
+gst_gl_window_x11_egl_new (GstGLAPI gl_api, guintptr external_gl_context,
+    GError ** error)
 {
   GstGLWindowX11EGL *window = g_object_new (GST_GL_TYPE_WINDOW_X11_EGL, NULL);
 
   gst_gl_window_x11_open_device (GST_GL_WINDOW_X11 (window), gl_api,
-      external_gl_context);
+      external_gl_context, error);
 
   return window;
 }
 
 static gboolean
-gst_gl_window_x11_egl_choose_format (GstGLWindowX11 * window_x11)
+gst_gl_window_x11_egl_choose_format (GstGLWindowX11 * window_x11,
+    GError ** error)
 {
   gint ret;
 
@@ -99,12 +98,18 @@ gst_gl_window_x11_egl_choose_format (GstGLWindowX11 * window_x11)
   ret = XMatchVisualInfo (window_x11->device, window_x11->screen_num,
       window_x11->depth, TrueColor, window_x11->visual_info);
 
-  return ret != 0;
+  if (ret == 0) {
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_WRONG_CONFIG,
+        "Failed to match XVisualInfo");
+    return FALSE;
+  }
+
+  return TRUE;
 }
 
 static gboolean
 gst_gl_window_x11_egl_create_context (GstGLWindowX11 * window_x11,
-    GstGLAPI gl_api, guintptr external_gl_context)
+    GstGLAPI gl_api, guintptr external_gl_context, GError ** error)
 {
   GstGLWindowX11EGL *window_egl;
 
@@ -131,19 +136,20 @@ gst_gl_window_x11_egl_create_context (GstGLWindowX11 * window_x11,
       eglGetDisplay ((EGLNativeDisplayType) window_x11->device);
 
   if (eglInitialize (window_egl->egl_display, &majorVersion, &minorVersion))
-    g_debug ("egl initialized: %d.%d\n", majorVersion, minorVersion);
+    GST_INFO ("egl initialized, version: %d.%d", majorVersion, minorVersion);
   else {
-    g_debug ("failed to initialize egl %ld, %s\n",
-        (gulong) window_egl->egl_display, X11EGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR,
+        GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE,
+        "Failed to initialize egl: %s", X11EGLErrorString ());
     goto failure;
   }
 
   if (eglChooseConfig (window_egl->egl_display, config_attrib, &config, 1,
           &numConfigs))
-    g_debug ("config set: %ld, %ld\n", (gulong) config, (gulong) numConfigs);
+    GST_INFO ("config set: %ld, %ld", (gulong) config, (gulong) numConfigs);
   else {
-    g_debug ("failed to set config %ld, %s\n", (gulong) window_egl->egl_display,
-        X11EGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_WRONG_CONFIG,
+        "Failed to set window configuration: %s", X11EGLErrorString ());
     goto failure;
   }
 
@@ -151,26 +157,24 @@ gst_gl_window_x11_egl_create_context (GstGLWindowX11 * window_x11,
       eglCreateWindowSurface (window_egl->egl_display, config,
       (EGLNativeWindowType) window_x11->internal_win_id, NULL);
   if (window_egl->egl_surface != EGL_NO_SURFACE)
-    g_debug ("surface created: %ld\n", (gulong) window_egl->egl_surface);
+    GST_INFO ("surface created");
   else {
-    g_debug ("failed to create surface %ld, %ld, %ld, %s\n",
-        (gulong) window_egl->egl_display, (gulong) window_egl->egl_surface,
-        (gulong) window_egl->egl_display, X11EGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_FAILED,
+        "Failed to create window surface: %s", X11EGLErrorString ());
     goto failure;
   }
 
-  g_debug ("about to create gl context\n");
+  GST_DEBUG ("about to create gl context\n");
 
   window_egl->egl_context =
       eglCreateContext (window_egl->egl_display, config,
       (EGLContext) external_gl_context, context_attrib);
 
   if (window_egl->egl_context != EGL_NO_CONTEXT)
-    g_debug ("gl context created: %ld\n", (gulong) window_egl->egl_context);
+    GST_INFO ("gl context created: %ld", (gulong) window_egl->egl_context);
   else {
-    g_debug ("failed to create glcontext %ld, %ld, %s\n",
-        (gulong) window_egl->egl_context, (gulong) window_egl->egl_display,
-        X11EGLErrorString ());
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_CREATE_CONTEXT,
+        "Failed to create a OpenGL context: %s", X11EGLErrorString ());
     goto failure;
   }
 
diff --git a/gst-libs/gst/gl/x11/gstglwindow_x11_egl.h b/gst-libs/gst/gl/x11/gstglwindow_x11_egl.h
index d78cc89..c64c648 100644
--- a/gst-libs/gst/gl/x11/gstglwindow_x11_egl.h
+++ b/gst-libs/gst/gl/x11/gstglwindow_x11_egl.h
@@ -21,9 +21,10 @@
 #ifndef __GST_GL_WINDOW_X11_EGL_H__
 #define __GST_GL_WINDOW_X11_EGL_H__
 
-#include "gstglapi.h"
 #include "gstglwindow_x11.h"
 
+#include <EGL/egl.h>
+
 G_BEGIN_DECLS
 
 #define GST_GL_TYPE_WINDOW_X11_EGL         (gst_gl_window_x11_egl_get_type())
@@ -58,7 +59,8 @@ struct _GstGLWindowX11EGLClass {
 GType gst_gl_window_x11_egl_get_type     (void);
 
 GstGLWindowX11EGL * gst_gl_window_x11_egl_new  (GstGLAPI gl_api,
-                                                guintptr external_gl_context);
+                                                guintptr external_gl_context,
+                                                GError ** error);
 
 G_END_DECLS
 
diff --git a/gst-libs/gst/gl/x11/gstglwindow_x11_glx.c b/gst-libs/gst/gl/x11/gstglwindow_x11_glx.c
index f952347..654dd4c 100644
--- a/gst-libs/gst/gl/x11/gstglwindow_x11_glx.c
+++ b/gst-libs/gst/gl/x11/gstglwindow_x11_glx.c
@@ -29,14 +29,11 @@
 
 #include "gstglwindow_x11_glx.h"
 
-#define GST_CAT_DEFAULT gst_gl_window_x11_glx_debug
-GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
+#define GST_CAT_DEFAULT gst_gl_window_debug
 
-#define DEBUG_INIT \
-  GST_DEBUG_CATEGORY_GET (GST_CAT_DEFAULT, "glwindow");
 #define gst_gl_window_x11_glx_parent_class parent_class
-G_DEFINE_TYPE_WITH_CODE (GstGLWindowX11GLX, gst_gl_window_x11_glx,
-    GST_GL_TYPE_WINDOW_X11, DEBUG_INIT);
+G_DEFINE_TYPE (GstGLWindowX11GLX, gst_gl_window_x11_glx,
+    GST_GL_TYPE_WINDOW_X11);
 
 static guintptr gst_gl_window_x11_glx_get_gl_context (GstGLWindowX11 *
     window_x11);
@@ -44,10 +41,10 @@ static void gst_gl_window_x11_glx_swap_buffers (GstGLWindowX11 * window_x11);
 static gboolean gst_gl_window_x11_glx_activate (GstGLWindowX11 * window_x11,
     gboolean activate);
 static gboolean gst_gl_window_x11_glx_create_context (GstGLWindowX11 *
-    window_x11, GstGLAPI gl_api, guintptr external_gl_context);
+    window_x11, GstGLAPI gl_api, guintptr external_gl_context, GError ** error);
 static void gst_gl_window_x11_glx_destroy_context (GstGLWindowX11 * window_x11);
 static gboolean gst_gl_window_x11_glx_choose_format (GstGLWindowX11 *
-    window_x11);
+    window_x11, GError ** error);
 GstGLAPI gst_gl_window_x11_glx_get_gl_api (GstGLWindow * window);
 
 static void
@@ -80,19 +77,20 @@ gst_gl_window_x11_glx_init (GstGLWindowX11GLX * window)
 
 /* Must be called in the gl thread */
 GstGLWindowX11GLX *
-gst_gl_window_x11_glx_new (GstGLAPI gl_api, guintptr external_gl_context)
+gst_gl_window_x11_glx_new (GstGLAPI gl_api, guintptr external_gl_context,
+    GError ** error)
 {
   GstGLWindowX11GLX *window = g_object_new (GST_GL_TYPE_WINDOW_X11_GLX, NULL);
 
   gst_gl_window_x11_open_device (GST_GL_WINDOW_X11 (window), gl_api,
-      external_gl_context);
+      external_gl_context, error);
 
   return window;
 }
 
 static gboolean
 gst_gl_window_x11_glx_create_context (GstGLWindowX11 * window_x11,
-    GstGLAPI gl_api, guintptr external_gl_context)
+    GstGLAPI gl_api, guintptr external_gl_context, GError ** error)
 {
   GstGLWindowX11GLX *window_glx;
 
@@ -103,7 +101,8 @@ gst_gl_window_x11_glx_create_context (GstGLWindowX11 * window_x11,
       (GLXContext) external_gl_context, TRUE);
 
   if (!window_glx->glx_context) {
-    GST_WARNING ("failed to create opengl context (glXCreateContext failed)");
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_CREATE_CONTEXT,
+        "Failed to create opengl context (glXCreateContext failed)");
     goto failure;
   }
 
@@ -128,7 +127,8 @@ gst_gl_window_x11_glx_destroy_context (GstGLWindowX11 * window_x11)
 }
 
 static gboolean
-gst_gl_window_x11_glx_choose_format (GstGLWindowX11 * window_x11)
+gst_gl_window_x11_glx_choose_format (GstGLWindowX11 * window_x11,
+    GError ** error)
 {
   gint error_base;
   gint event_base;
@@ -142,7 +142,8 @@ gst_gl_window_x11_glx_choose_format (GstGLWindowX11 * window_x11)
   };
 
   if (!glXQueryExtension (window_x11->device, &error_base, &event_base)) {
-    GST_WARNING ("No GLX extension");
+    g_set_error (error, GST_GL_WINDOW_ERROR,
+        GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE, "No GLX extension");
     goto failure;
   }
 
@@ -150,7 +151,8 @@ gst_gl_window_x11_glx_choose_format (GstGLWindowX11 * window_x11)
       window_x11->screen_num, attrib);
 
   if (!window_x11->visual_info) {
-    GST_WARNING ("glx visual is null (bad attributes)");
+    g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_WRONG_CONFIG,
+        "Bad attributes in glXChooseVisual");
     goto failure;
   }
 
diff --git a/gst-libs/gst/gl/x11/gstglwindow_x11_glx.h b/gst-libs/gst/gl/x11/gstglwindow_x11_glx.h
index b9aca83..6207f06 100644
--- a/gst-libs/gst/gl/x11/gstglwindow_x11_glx.h
+++ b/gst-libs/gst/gl/x11/gstglwindow_x11_glx.h
@@ -21,9 +21,10 @@
 #ifndef __GST_GL_WINDOW_X11_GLX_H__
 #define __GST_GL_WINDOW_X11_GLX_H__
 
-#include "gstglapi.h"
 #include "gstglwindow_x11.h"
 
+#include <GL/glx.h>
+
 G_BEGIN_DECLS
 
 #define GST_GL_TYPE_WINDOW_X11_GLX         (gst_gl_window_x11_glx_get_type())
@@ -56,7 +57,8 @@ struct _GstGLWindowX11GLXClass {
 GType gst_gl_window_x11_glx_get_type     (void);
 
 GstGLWindowX11GLX * gst_gl_window_x11_glx_new  (GstGLAPI gl_api,
-                                                guintptr external_gl_context);
+                                                guintptr external_gl_context,
+                                                GError ** error);
 
 G_END_DECLS