Add tests for gdk_content_formats_parse

Add a test that checks we can roundtrip things through
gdk_content_formats_parse and gdk_content_formats_to_string.

.gitlab-ci.yml

@@ -24,9 +24,8 @@ variables:
   BACKEND_FLAGS: "-Dx11-backend=true -Dwayland-backend=true -Dbroadway-backend=true"
   FEATURE_FLAGS: "-Dvulkan=enabled -Dcloudproviders=enabled"
   MESON_TEST_TIMEOUT_MULTIPLIER: 3
-  FEDORA_IMAGE: "registry.gitlab.gnome.org/gnome/gtk/fedora:v31"
+  FEDORA_IMAGE: "registry.gitlab.gnome.org/gnome/gtk/fedora:v32"
   FLATPAK_IMAGE: "registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:master"
-  DOCS_IMAGE: "registry.gitlab.gnome.org/gnome/gtk/fedora:v31"
 
 .only-default:
   only:
@@ -60,6 +59,7 @@ style-check-diff:
       - "${CI_PROJECT_DIR}/_build/testsuite/reftests/output/*/*.png"
       - "${CI_PROJECT_DIR}/_build/testsuite/gsk/compare/*/*/*.png"
       - "${CI_PROJECT_DIR}/_build/testsuite/css/output/*/*.syscap"
+      - "${CI_PROJECT_DIR}/_build_hello/meson-logs"
   cache:
     key: "$CI_JOB_NAME"
     paths:
@@ -79,9 +79,14 @@ fedora-x86_64:
   script:
     - .gitlab-ci/show-info-linux.sh
     - meson subprojects update
-    - meson ${COMMON_MESON_FLAGS} ${EXTRA_MESON_FLAGS} ${BACKEND_FLAGS} ${FEATURE_FLAGS}
+    - mkdir _install
+    - meson --prefix=${CI_PROJECT_DIR}/_install
+            ${COMMON_MESON_FLAGS} ${EXTRA_MESON_FLAGS} ${BACKEND_FLAGS} ${FEATURE_FLAGS}
             _build
-    - ninja -C _build
+    - meson compile -C _build
+    - meson install -C _build
+    - PKG_CONFIG_PATH=${CI_PROJECT_DIR}/_install/lib64/pkgconfig:${CI_PROJECT_DIR}/_install/share/pkgconfig meson setup _build_hello examples/hello
+    - meson compile -C _build_hello
     - .gitlab-ci/run-tests.sh _build x11
     - .gitlab-ci/run-tests.sh _build wayland
     - .gitlab-ci/run-tests.sh _build broadway
@@ -165,6 +170,9 @@ macos:
     - export MESON_FORCE_BACKTRACE=1
   script:
     - meson -Dx11-backend=false
+            -Dbroadway-backend=true
+            -Dmacos-backend=true
+            -Dmedia-gstreamer=disabled
             -Dintrospection=disabled
             -Dcpp_std=c++11
             -Dpixman:tests=disabled
@@ -302,7 +310,7 @@ asan-build:
   allow_failure: true
 
 reference:
-  image: $DOCS_IMAGE
+  image: $FEDORA_IMAGE
   stage: docs
   needs: []
   variables:

.gitlab-ci/fedora.Dockerfile

@@ -38,7 +38,6 @@ RUN dnf -y install \
     gstreamer1-plugins-good \
     gstreamer1-plugins-bad-free-devel \
     gstreamer1-plugins-base-devel \
-    gtk-doc \
     hicolor-icon-theme \
     iso-codes \
     itstool \

.gitlab-ci/test-docker.sh

@@ -15,7 +15,7 @@ meson \
         -Dx11-backend=true \
         -Dwayland-backend=true \
         -Dbroadway-backend=true \
-        -Dvulkan=yes \
+        -Dvulkan=enabled \
         -Dprofiler=true \
         --werror \
         ${EXTRA_MESON_FLAGS:-} \

.gitlab-ci/test-msvc.bat

@@ -6,7 +6,7 @@ call "C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Auxiliar
 
 :: FIXME: make warnings fatal
 pip3 install --upgrade --user meson==0.56.2  || goto :error
-meson _build || goto :error
+meson -Dmedia-gstreamer=disabled _build || goto :error
 ninja -C _build || goto :error
 
 goto :EOF

NEWS

@@ -1,3 +1,213 @@
+Overview of Changes in 4.3.2
+============================
+
+* GtkToggleButton:
+ - Fix the actionable implementation
+
+* GtkCheckButton:
+ - Fix the actionable implementation
+ - Cancel activation on when the pointer leaves
+
+* GtkMenuButton:
+ - Make activatable again
+ - Add a way to have an icon + arrow
+
+* GtkColorButton:
+ - Make activatable again
+
+* GtkFontButton:
+ - Make activatable again
+
+* GtkAppChooserButton:
+ - Make activatable again
+
+* GtkColumnView:
+ - Fix double activation
+
+* GtkLabel:
+ - Fix mnemonics without markup
+
+* GtkTreeView:
+ - Clip header buttons
+
+* GtkTextView:
+ - Add api to get the RTL and LTR contexts
+ - Fix some errors in text history grouping
+
+* GtkText:
+ - Don't show placeholder text on top of entry text
+ - Add api to compute the cursor extents
+ - Fix y coordinates for text selection
+
+* GtkFileChooser:
+ - Don't show Trash in the side bar
+
+* GtkPopoverMenu:
+ - Add scrollbars to long menus
+
+* GtkActionMuxer:
+ - Fix propagation of accel changes
+
+* Introspection:
+ - Annotate all filename arguments
+ - Rename GtkMediaStream apis to avoid name collisions
+ - Rename GtkDropTarget properties to avoid name collisions
+ - Make GtkPasswordEntryBuffer introspectable
+
+* Printing:
+ - Remove the Google Cloud Print backend
+
+* Theme:
+ - Sync included icons with the Adwaita icon theme
+
+* GSK:
+ - Avoid overflowing the vertex counter
+ - Handle negative scales correctly in the ngl renderer
+
+* GDK:
+ - Cleanup and simplify OpenGL setup code
+ - Add a GdkDisplay::init_gl vfunc and gdk_display_prepare_gl() api
+ - Require EGL 1.4
+ - Fix EGL + NVidia
+
+* Build:
+ - Enable gstreamer by default
+ - Disable Vulkan by default
+ - Remove the sassc option
+ - Remove options and checks for X11 extensions
+
+* X11:
+ - Stop using XComposite
+ - Remove the Visual cache
+
+* Wayland:
+ - Fix some DND corner cases
+ - Work with version 2 of pointer-gestures-v1
+ - Look for cursor themes in $HOME/.icons
+
+* Windows:
+ - Fix SIGILL on x64 due to popcnt
+ - Fix popup placement
+ - Fix drag icon placement
+ - Clean up HiDPI and WGL support
+ - Default to WGL
+
+* MacOs:
+ - Fix input method support
+ - Register known clipboard types for drop targets
+ - Add initial DND support
+
+* Translation updates:
+ Brazilian Portuguese
+ Portuguese
+ Romanian
+ Turkish
+ Ukrainian
+
+
+Overview of Changes in 4.3.1
+============================
+
+* GtkEmojiChooser:
+ - Update data from CLDR 39
+ - Load Emoji data for both language and territory
+
+* GtkCalendar:
+ - Fix an off-by-one error in day numbers
+
+* GtkListView:
+ - Add .activatable style class to activatable items
+
+* GtkCheckButton:
+ - Don't allow unchecking grouped radio buttons
+
+*GtkToggleButton:
+ - Fix mnemonic activation propagation
+
+* GtkLabel:
+ - Make mnemonics work even when invisible
+ - Fix mnemonic activation propagation
+
+* GtkMenuButton:
+ - Add a property to mark primary menus and make F10 work
+
+* GtkApplication:
+ - Fix initial screensaver state async
+
+* GtkEntry:
+ - Apply xalign to placeholder text (as it was in GTK 3)
+
+* GtkSpinButton:
+ - Fix swipe gestures
+
+* GtkStackSwitcher:
+ - Implement GtkOrientable (as it was in GTK 3)
+ - Fix a use-after-free problem with drag timeouts
+
+* GtkFileChooser:
+ - Add support for (case-insensitive) suffix matches in GtkFileFilter
+
+* GtkPasswordEntry:
+ - Make GtkPasswordEntryBuffer public, to make it easier
+   to write your own password entry widget
+
+* Input:
+ - Fix interference between various obscure XKB features
+   (e.g. overlays) and Compose sequences
+
+* Action support:
+ - Fix submenu-action handling
+
+* Theme:
+ - Update icons from the Adwaita icon theme
+ - Fix icon names for GtkSwitch
+ - Fix switch-off icon
+
+* GSK:
+ - Improve transformed offscreen rendering
+ - Add padding between cached glyphs
+
+* Wayland:
+ - Fix monitor sizes in the presence of transforms
+ - Add a getter for the EGLDisplay
+ - Fix click-drag-release sequences for popovers
+
+* X11:
+ - Support EGL for X11. Fall back to GLX if EGL isn't available
+ - Always fall back to GLX on NVidia
+ - Add a getter for the EGLDisplay
+
+* Broadway:
+ - Add a setter for display scale
+
+* Windows:
+ - Add a getter for the EGLDisplay
+ - Make GL work for media playback
+
+* MacOS:
+ - Fix menubar appearance
+
+* Tools:
+ - gtk4-builder-tool: Replace can-focus with focusable in 3-to-4 conversion
+
+* Introspection:
+ - Add missing annotations in a few places (e.g. gtk_free_view_row_activated)
+
+* Build:
+ - Only build one source file with -mf16c
+ - Fix devel styling for ci flatpak builds
+ - Generate appdata for demo flatpaks
+
+* Docs:
+ - Numerous fixes and additions
+
+* Translation updates:
+ Friulian
+ Nepali
+ Norwegian Bokmål
+ Ukrainian
+
+
 Overview of Changes in 4.3.0
 ============================
 

README.md

@@ -157,8 +157,8 @@ Release notes
 The release notes for GTK are part of the migration guide in the API
 reference. See:
 
- - [3.x release notes](https://developer.gnome.org/gtk3/unstable/gtk-migrating-2-to-3.html)
- - [4.x release notes](https://developer.gnome.org/gtk4/unstable/gtk-migrating-3-to-4.html)
+ - [3.x release notes](https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html)
+ - [4.x release notes](https://docs.gtk.org/gtk4/migrating-3to4.html)
 
 Licensing terms
 ---------------

config.h.meson

@@ -124,9 +124,6 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #mesondefine HAVE_UNISTD_H
 
-/* Have the XCOMPOSITE X extension */
-#mesondefine HAVE_XCOMPOSITE
-
 /* Have the Xcursor library */
 #mesondefine HAVE_XCURSOR
 

demos/gtk-demo/gtkshadertoy.c

@@ -163,8 +163,8 @@ drag_update_cb (GtkGestureDrag *drag,
 
 static void
 drag_end_cb (GtkGestureDrag *drag,
-             gdouble         dx,
-             gdouble         dy,
+             double          dx,
+             double          dy,
              gpointer        user_data)
 {
   GtkShadertoy *shadertoy = GTK_SHADERTOY (user_data);

demos/gtk-demo/menu.c

@@ -21,8 +21,10 @@ do_menu (GtkWidget *do_widget)
 
   if (!window)
     {
+      GtkWidget *box;
       GtkWidget *sw;
       GtkWidget *widget;
+      GtkWidget *scale;
 
       window = gtk_window_new ();
       gtk_window_set_title (GTK_WINDOW (window), "Menu");
@@ -31,11 +33,23 @@ do_menu (GtkWidget *do_widget)
                               gtk_widget_get_display (do_widget));
       g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
 
+      box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+      gtk_window_set_child (GTK_WINDOW (window), box);
+
       sw = gtk_scrolled_window_new ();
-      gtk_window_set_child (GTK_WINDOW (window), sw);
+      gtk_widget_set_vexpand (sw, TRUE);
+      gtk_box_append (GTK_BOX (box), sw);
 
       widget = demo3_widget_new ("/transparent/portland-rose.jpg");
       gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), widget);
+
+      scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0.01, 10.0, 0.1);
+      gtk_range_set_value (GTK_RANGE (scale), 1.0);
+      gtk_box_append (GTK_BOX (box), scale);
+
+      g_object_bind_property (gtk_range_get_adjustment (GTK_RANGE (scale)), "value",
+                              widget, "scale",
+                              G_BINDING_BIDIRECTIONAL);
     }
 
   if (!gtk_widget_get_visible (window))

demos/gtk-demo/org.gtk.Demo4.appdata.xml.in

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">
-  <id>org.gtk.Demo4.desktop</id>
+  <id>org.gtk.Demo4</id>
+  <launchable type="desktop-id">org.gtk.Demo4.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
-  <project_license>LGPL-2.0+</project_license>
+  <project_license>LGPL-2.1-or-later</project_license>
   <name>GTK Demo</name>
   <summary>Program to demonstrate GTK functions</summary>
   <description>
@@ -30,6 +31,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="@BUILD_VERSION@" date="@BUILD_DATE@">
       <description>

demos/gtk-demo/paintable_mediastream.c

@@ -150,7 +150,7 @@ gtk_nuclear_media_stream_step (gpointer data)
    * call our pause function to pause the stream.
    */
   if (nuclear->progress >= DURATION)
-    gtk_media_stream_ended (GTK_MEDIA_STREAM (nuclear));
+    gtk_media_stream_stream_ended (GTK_MEDIA_STREAM (nuclear));
 
   /* The timeout function is removed by the pause function,
    * so we can just always return this value.
@@ -267,11 +267,11 @@ gtk_nuclear_media_stream_init (GtkNuclearMediaStream *nuclear)
    * However, media streams need to tell GTK once they are initialized,
    * so we do that here.
    */
-  gtk_media_stream_prepared (GTK_MEDIA_STREAM (nuclear),
-                             FALSE,
-                             TRUE,
-                             TRUE,
-                             DURATION);
+  gtk_media_stream_stream_prepared (GTK_MEDIA_STREAM (nuclear),
+                                    FALSE,
+                                    TRUE,
+                                    TRUE,
+                                    DURATION);
 }
 
 /* And finally, we add the simple constructor we declared in the header. */

demos/gtk-demo/peg_solitaire.c

@@ -1,7 +1,7 @@
 /* Peg Solitaire
  * #Keywords: GtkGridView, game
  *
- * This demo demonstrates how to use drag'n'drop to implement peg solitaire.
+ * This demo demonstrates how to use drag-and-drop to implement peg solitaire.
  *
  */
 
@@ -98,7 +98,7 @@ solitaire_peg_init (SolitairePeg *peg)
 
 /* Add a little setter for the peg's position.
  * We want to track those so that we can check for legal moves
- * during drag'n'drop operations.
+ * during drag-and-drop operations.
  */
 static void
 solitaire_peg_set_position (SolitairePeg *peg,

demos/icon-browser/org.gtk.IconBrowser4.appdata.xml.in

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">
-  <id>org.gtk.IconBrowser4.desktop</id>
+  <id>org.gtk.IconBrowser4</id>
+  <launchable type="desktop-id">org.gtk.IconBrowser4.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
-  <project_license>LGPL-2.0+</project_license>
+  <project_license>LGPL-2.1-or-later</project_license>
   <name>GTK Icon Browser</name>
   <summary>Program to browse themed icons</summary>
   <description>
@@ -29,6 +30,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="@BUILD_VERSION@" date="@BUILD_DATE@">
       <description>

demos/print-editor/org.gtk.PrintEditor4.appdata.xml

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">
-  <id>org.gtk.PrintEditor4.desktop</id>
+  <id>org.gtk.PrintEditor4</id>
+  <launchable type="desktop-id">org.gtk.PrintEditor4.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
-  <project_license>LGPL-2.0+</project_license>
+  <project_license>LGPL-2.1-or-later</project_license>
   <name>GTK Print Editor</name>
   <summary>Program to demonstrate GTK printing</summary>
   <description>
@@ -24,6 +25,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="3.99.0" date="2020-07-30">
       <description>

demos/print-editor/print-editor.c

@@ -721,7 +721,6 @@ static const char ui_info[] =
   "        <item>"
   "          <attribute name='label'>_New</attribute>"
   "          <attribute name='action'>app.new</attribute>"
-  "          <attribute name='accel'>&lt;Primary&gt;n</attribute>"
   "        </item>"
   "        <item>"
   "          <attribute name='label'>_Open</attribute>"
@@ -730,12 +729,10 @@ static const char ui_info[] =
   "        <item>"
   "          <attribute name='label'>_Save</attribute>"
   "          <attribute name='action'>app.save</attribute>"
-  "          <attribute name='accel'>&lt;Primary&gt;s</attribute>"
   "        </item>"
   "        <item>"
   "          <attribute name='label'>Save _As...</attribute>"
   "          <attribute name='action'>app.save-as</attribute>"
-  "          <attribute name='accel'>&lt;Primary&gt;s</attribute>"
   "        </item>"
   "      </section>"
   "      <section>"
@@ -756,7 +753,6 @@ static const char ui_info[] =
   "        <item>"
   "          <attribute name='label'>_Quit</attribute>"
   "          <attribute name='action'>app.quit</attribute>"
-  "          <attribute name='accel'>&lt;Primary&gt;q</attribute>"
   "        </item>"
   "      </section>"
   "    </submenu>"
@@ -766,7 +762,6 @@ static const char ui_info[] =
   "        <item>"
   "          <attribute name='label'>_About Print Editor</attribute>"
   "          <attribute name='action'>app.about</attribute>"
-  "          <attribute name='accel'>&lt;Primary&gt;a</attribute>"
   "        </item>"
   "      </section>"
   "    </submenu>"
@@ -794,6 +789,15 @@ startup (GApplication *app)
 {
   GtkBuilder *builder;
   GMenuModel *menubar;
+  struct {
+    const char *action_and_target;
+    const char *accelerators[2];
+  } accels[] = {
+    { "app.new", { "<Control>n", NULL } },
+    { "app.quit", { "<Control>q", NULL } },
+    { "app.save", { "<Control>s", NULL } },
+    { "app.about", { "<Control>a", NULL } },
+  };
 
   builder = gtk_builder_new ();
   gtk_builder_add_from_string (builder, ui_info, -1, NULL);
@@ -802,6 +806,9 @@ startup (GApplication *app)
 
   gtk_application_set_menubar (GTK_APPLICATION (app), menubar);
 
+  for (int i = 0; i < G_N_ELEMENTS (accels); i++)
+    gtk_application_set_accels_for_action (GTK_APPLICATION (app), accels[i].action_and_target, accels[i].accelerators);
+
   g_object_unref (builder);
 }
 

demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml.in

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">
-  <id>org.gtk.WidgetFactory4.desktop</id>
+  <id>org.gtk.WidgetFactory4</id>
+  <launchable type="desktop-id">org.gtk.WidgetFactory4.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
-  <project_license>LGPL-2.0+</project_license>
+  <project_license>LGPL-2.1-or-later</project_license>
   <name>GTK Widget Factory</name>
   <summary>Program to demonstrate GTK functions</summary>
   <description>
@@ -31,6 +32,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="@BUILD_VERSION@" date="@BUILD_DATE@">
       <description>

demos/widget-factory/widget-factory.c

@@ -1997,6 +1997,7 @@ activate (GApplication *app)
     const char *accelerators[2];
   } accels[] = {
     { "app.about", { "F1", NULL } },
+    { "app.shortcuts", { "<Control>question", NULL } },
     { "app.quit", { "<Control>q", NULL } },
     { "app.open-in", { "<Control>n", NULL } },
     { "win.dark", { "<Control>d", NULL } },

demos/widget-factory/widget-factory.ui

@@ -2902,7 +2902,7 @@ bad things might happen.</property>
 
     <action-widgets>
       <action-widget response="cancel">cancel_info_dialog</action-widget>
-      <action-widget response="ok">doit_info_dialog</action-widget>
+      <action-widget response="ok" default="true">doit_info_dialog</action-widget>
     </action-widgets>
   </object>
   <object class="GtkDialog" id="action_dialog">

docs/reference/gdk/gdk4.toml.in

@@ -5,7 +5,7 @@ repository_url = "https://gitlab.gnome.org/GNOME/gtk.git"
 website_url = "https://www.gtk.org"
 authors = "GTK Development Team"
 logo_url = "gtk-logo.svg"
-license = "GPL-2.1-or-later"
+license = "LGPL-2.1-or-later"
 description = "The GTK toolkit"
 dependencies = [ "GObject-2.0", "cairo-1.0", "Pango-1.0", "GdkWayland-4.0",  "GdkX11-4.0" ]
 devhelp = true

docs/reference/gsk/gsk4.toml.in

@@ -5,7 +5,7 @@ repository_url = "https://gitlab.gnome.org/GNOME/gtk.git"
 website_url = "https://www.gtk.org"
 authors = "GTK Development Team"
 logo_url = "gtk-logo.svg"
-license = "GPL-2.1-or-later"
+license = "LGPL-2.1-or-later"
 description = "The GTK toolkit"
 dependencies = [ "GObject-2.0", "Graphene-1.0", "Pango-1.0", "Gdk-4.0" ]
 devhelp = true

docs/reference/gtk/drag-and-drop.md

@@ -0,0 +1,54 @@
+Title: Drag-and-Drop in GTK
+
+Drag-and-Drop (DND) is a user interaction pattern where users drag a UI element
+from one place to another, either inside a single application or between
+different application windows.
+
+When the element is 'dropped', data is transferred from the source to the
+destination, according to the drag action that is negotiated between both
+sides. Most commonly, that is a _copy_, but it can also be a _move_ or a
+_link_, depending on the kind of data and how the drag operation has been
+set up.
+
+This chapter gives an overview over how Drag-and-Drop is handled with event
+controllers in GTK.
+
+## Drag sources
+
+To make data available via DND, you create a [class@Gtk.DragSource]. Drag sources
+are event controllers, which initiate a Drag-and-Drop operation when the user clicks
+and drags the widget.
+
+A drag source can be set up ahead of time, with the desired drag action(s) and the data
+to be transferred. But it is also possible to provide the data when a drag operation
+is about to begin, by connecting to the [signal@Gtk.DragSource::prepare] signal.
+
+The GtkDragSource emits the [signal@Gtk.DragSource::drag-begin] signal when the DND
+operation starts, and the [signal@Gtk.DragSource::drag-end] signal when it is done.
+But it is not normally necessary to handle these signals. One case in which a ::drag-end
+handler is necessary is to implement `GDK_ACTION_MOVE`.
+
+## Drop targets
+
+To receive data via DND, you create a [class@Gtk.DropTarget], and tell it what kind of
+data to accept. You need to connect to the [signal@Gtk.DropTarget::drop] signal to receive
+the data when a DND operation occurs.
+
+While a DND operation is ongoing, GTK provides updates when the pointer moves over
+the widget to which the drop target is associated. The [signal@Gtk.DropTarget::enter],
+[signal@Gtk.DropTarget::leave] and [signal@Gtk.DropTarget::motion] signals get emitted
+for this purpose.
+
+GtkDropTarget provides a simple API, and only provides the data when it has been completely
+transferred. If you need to handle the data transfer yourself (for example to provide progress
+information during the transfer), you can use the more complicated [class@Gtk.DropTargetAsync].
+
+## Other considerations
+
+It is sometimes necessary to update the UI of the destination while a DND operation is ongoing,
+say to scroll or expand a view, or to switch pages. Typically, such UI changes are triggered
+by hovering over the widget in question.
+
+[class@Gtk.DropControllerMotion] is an event controller that can help with implementing such
+behaviors. It is very similar to [class@Gtk.EventControllerMotion], but provides events during
+a DND operation.

docs/reference/gtk/getting_started.md

@@ -161,19 +161,19 @@ activate (GtkApplication *app,
 {
   GtkWidget *window;
   GtkWidget *button;
-  GtkWidget *box;
 
   window = gtk_application_window_new (app);
   gtk_window_set_title (GTK_WINDOW (window), "Window");
   gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
 
-  box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
-  gtk_window_set_child (GTK_WINDOW (window), box);
-
   button = gtk_button_new_with_label ("Hello World");
+  gtk_widget_set_halign (button, GTK_ALIGN_CENTER);
+  gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
+
   g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
   g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_window_destroy), window);
-  gtk_box_append (GTK_BOX (box), button);
+
+  gtk_window_set_child (GTK_WINDOW (window), button);
 
   gtk_widget_show (window);
 }

docs/reference/gtk/gtk4-launch.xml

@@ -46,7 +46,8 @@ display, unless specified otherwise.
 <para>
 <command>gtk4-launch</command> takes at least one argument, the name of
 the application to launch. The name should match application desktop file name,
-as residing in /usr/share/application, with or without the '.desktop' suffix.
+as residing in the applications subdirectories of the XDG data directories, with
+or without the '.desktop' suffix.
 </para>
 <para>
 If called with more than one argument, the rest of them besides the application
@@ -71,4 +72,14 @@ application.
   </variablelist>
 </refsect1>
 
+<refsect1><title>Environment</title>
+  <para>Some environment variables affect the behavior of <command>gtk4-launch</command>.</para>
+  <variablelist>
+    <varlistentry>
+    <term><option>XDG_DATA_HOME</option>, <option>XDG_DATA_DIRS</option></term>
+      <listitem><para>The environment variables specifying the XDG dta directories.</para></listitem>
+    </varlistentry>
+  </variablelist>
+</refsect1>
+
 </refentry>

docs/reference/gtk/gtk4.toml.in

@@ -5,7 +5,7 @@ repository_url = "https://gitlab.gnome.org/GNOME/gtk.git"
 website_url = "https://www.gtk.org"
 authors = "GTK Development Team"
 logo_url = "gtk-logo.svg"
-license = "GPL-2.1-or-later"
+license = "LGPL-2.1-or-later"
 description = "The GTK toolkit"
 dependencies = [ "GObject-2.0", "Graphene-1.0", "Pango-1.0", "Gdk-4.0", "Gsk-4.0" ]
 devhelp = true
@@ -57,6 +57,7 @@ content_files = [
   "initialization.md",
   "actions.md",
   "input-handling.md",
+  "drag-and-drop.md",
   "drawing-model.md",
   "css-overview.md",
   "css-properties.md",

docs/reference/gtk/migrating-3to4.md

@@ -99,6 +99,12 @@ you should stop using `GdkVisual` APIs, since this object not longer
 exists in GTK 4. Most of its APIs are deprecated already and not
 useful when dealing with RGBA visuals.
 
+### Stop using `gtk_widget_set_app_paintable`
+
+This is gone in GTK4 with no direct replacement. But for some usecases there
+are alternatives. If you want to make the background transparent, you can set
+the background color to, for example, `rgba(255, 255, 255, 0)` using CSS instead.
+
 ### Stop using `GtkBox` padding, fill and expand child properties
 
 GTK 4 removes these [class@Gtk.Box] child properties, so you should stop using
@@ -133,7 +139,7 @@ or `gtk_style_context_get_color()` only accept the context's current
 state for their state argument. You should update all callers to pass
 the current state.
 
-### Stop using `gdk_pixbuf_get_from_window()` and `gdk_cairo_set_source_surface()`
+### Stop using `gdk_pixbuf_get_from_window()` and `gdk_cairo_set_source_window()`
 
 These functions are not supported in GTK 4. Instead, either use
 backend-specific APIs, or render your widgets using
@@ -187,11 +193,22 @@ for this change.
 | ::grab-broken-event | - |
 
 Event signals which are not directly related to input have to be dealt with
-on a one-by-one basis. If you were using `::configure-event` and
-`::window-state-event` to save window state, you should use property
-notification for corresponding [class@Gtk.Window] properties, such as
-[property@Gtk.Window:default-width], [property@Gtk.Window:default-height],
-[property@Gtk.Window:maximized] or [property@Gtk.Window:fullscreened].
+on a one-by-one basis:
+
+ - If you were using `::configure-event` and `::window-state-event` to save
+   window state, you should use property notification for corresponding
+   [class@Gtk.Window] properties, such as [property@Gtk.Window:default-width],
+   [property@Gtk.Window:default-height], [property@Gtk.Window:maximized] or
+   [property@Gtk.Window:fullscreened].
+ - If you were using `::delete-event` to present a confirmation when using
+   the close button of a window, you should use the
+   [signal@Gtk.Window::close-request] signal.
+ - If you were using `::map-event` and `::unmap-event` to track a window
+   being mapped, you should use property notification for the
+   [property@Gdk.Surface:mapped] property instead.
+ - The `::damage-event` signal has no replacement, as the only consumer
+   of damage events were the offscreen GDK surfaces, which have no
+   replacement in GTK 4.x.
 
 ### Set a proper application ID
 
@@ -232,6 +249,10 @@ in GTK 3, you can prepare for the switch by using `gtk_widget_destroy()`
 only on toplevel windows, and replace all other uses with
 `gtk_container_remove()` or `g_object_unref()`.
 
+### Stop using the GtkWidget.destroy vfunc
+
+Instead of implementing GtkWidget.destroy, you can implement GObject.dispose.
+
 ### Reduce the use of generic container APIs
 
 GTK 4 removes `gtk_container_add()` and `gtk_container_remove()`. While there
@@ -604,6 +625,9 @@ from `FALSE` to `TRUE`. In addition, there is a [property@Gtk.Widget:focusable]
 property, which controls whether an individual widget can receive
 the input focus.
 
+The `gtk4-builder-tool` utility, when called with the `--3to4` option of the
+`simplify` command, will replace `:can-focus` by `:focusable`.
+
 The feature to automatically keep the focus widget scrolled into view with
 `gtk_container_set_focus_vadjustment()` has been removed together with
 `GtkContainer`, and is provided by scrollable widgets instead. In the common
@@ -740,7 +764,7 @@ The abstract base class `GtkBin` for single-child containers has been
 removed. The former subclasses are now derived directly from `GtkWidget`,
 and have a "child" property for their child widget. To add a child, use
 the setter for the "child" property (e.g. [method@Gtk.Frame.set_child]) instead
-of `gtk_container_add()`. Adding a child in a ui file with <child> still works.
+of `gtk_container_add()`. Adding a child in a ui file with `<child>` still works.
 
 The affected classes are:
 
@@ -766,7 +790,7 @@ expand flags) and [vfunc@Gtk.Widget.get_request_mode] (if you want your
 container to support height-for-width).
 
 You may also want to implement the [iface@Gtk.Buildable] interface, to support
-adding children with <child> in ui files.
+adding children with `<child>` in ui files.
 
 ### Adapt to GtkContainer removal
 
@@ -777,7 +801,7 @@ and have class-specific add() and remove() functions.
 The most noticeable change is the use of [method@Gtk.Box.append] or [method@Gtk.Box.prepend]
 instead of `gtk_container_add()` for adding children to `GtkBox`, and the change
 to use container-specific remove functions, such as [method@Gtk.Stack.remove] instead
-of `gtk_container_remove()`. Adding a child in a ui file with <child> still works.
+of `gtk_container_remove()`. Adding a child in a ui file with `<child>` still works.
 
 The affected classes are:
 
@@ -804,6 +828,11 @@ by a layout manager (if they are layout-related), or handled in some
 other way. One possibility is to use child meta objects, as seen with
 [class@Gtk.AssistantPage], [class@Gtk.StackPage] and the like.
 
+If you used to define child properties with `<packing>` in ui files, you have
+to switch to using `<layout>` for the corresponding layout properties.
+`gtk4-builder-tool` can help with this conversion, with the `--3to4` option
+of the `simplify` command.
+
 The replacements for gtk_container_add() are:
 
 | Widget | Replacement |
@@ -1330,3 +1359,4 @@ of tree models, and widgets instead of cell renderers.
 
 To learn more about the new list widgets, you can read the [List Widget
 Overview](#ListWidget).
+

examples/application9/exampleapp.c

@@ -59,14 +59,12 @@ example_app_startup (GApplication *app)
 }
 
 static void
-example_app_create_window (GtkApplication *app,
-                           const char     *save_id)
+example_app_activate (GApplication *app)
 {
   ExampleAppWindow *win;
 
   win = example_app_window_new (EXAMPLE_APP (app));
-  gtk_widget_set_save_id (GTK_WIDGET (win), save_id);
-  /* FIXME: differentiate save ids */
+  gtk_window_present (GTK_WINDOW (win));
 }
 
 static void
@@ -95,8 +93,8 @@ static void
 example_app_class_init (ExampleAppClass *class)
 {
   G_APPLICATION_CLASS (class)->startup = example_app_startup;
+  G_APPLICATION_CLASS (class)->activate = example_app_activate;
   G_APPLICATION_CLASS (class)->open = example_app_open;
-  GTK_APPLICATION_CLASS (class)->create_window = example_app_create_window;
 }
 
 ExampleApp *
@@ -105,7 +103,5 @@ example_app_new (void)
   return g_object_new (EXAMPLE_APP_TYPE,
                        "application-id", "org.gtk.exampleapp",
                        "flags", G_APPLICATION_HANDLES_OPEN,
-                       "register-session", TRUE,
-                       "save-state", TRUE,
                        NULL);
 }

examples/application9/exampleappwin.c

@@ -17,8 +17,6 @@ struct _ExampleAppWindow
   GtkWidget *words;
   GtkWidget *lines;
   GtkWidget *lines_label;
-
-  GList *files;
 };
 
 G_DEFINE_TYPE (ExampleAppWindow, example_app_window, GTK_TYPE_APPLICATION_WINDOW)
@@ -213,68 +211,14 @@ example_app_window_dispose (GObject *object)
 
   g_clear_object (&win->settings);
 
-  g_list_free_full (win->files, g_object_unref);
-  win->files = NULL;
-
   G_OBJECT_CLASS (example_app_window_parent_class)->dispose (object);
 }
 
-static gboolean
-example_app_window_save_state (GtkWidget    *widget,
-                               GVariantDict *dict,
-                               gboolean     *save_children)
-{
-  ExampleAppWindow *win = EXAMPLE_APP_WINDOW (widget);
-  GVariantBuilder builder;
-
-  g_variant_builder_init (&builder, G_VARIANT_TYPE ("as"));
-  for (GList *l = win->files; l; l = l->next)
-    {
-      g_variant_builder_add (&builder, "s", g_file_peek_path (G_FILE (l->data)));
-    }
-
-  g_variant_dict_insert_value (dict, "files", g_variant_builder_end (&builder));
-
-  /* Save window state */
-  GTK_WIDGET_CLASS (example_app_window_parent_class)->save_state (widget, dict, save_children);
-
-  *save_children = TRUE;
-  return TRUE;
-}
-
-static gboolean
-example_app_window_restore_state (GtkWidget *widget,
-                                  GVariant  *state)
-{
-  ExampleAppWindow *win = EXAMPLE_APP_WINDOW (widget);
-  GVariantIter *iter;
-
-  /* Restore window state */
-  GTK_WIDGET_CLASS (example_app_window_parent_class)->restore_state (widget, state);
-
-  if (g_variant_lookup (state, "files", "as", &iter))
-    {
-       const char *path;
-
-       while (g_variant_iter_next (iter, "&s", &path))
-         {
-           GFile *file = g_file_new_for_path (path);
-           example_app_window_open (win, file);
-           g_object_unref (file);
-         }
-    }
-
-  return TRUE;
-}
-
 static void
 example_app_window_class_init (ExampleAppWindowClass *class)
 {
   G_OBJECT_CLASS (class)->dispose = example_app_window_dispose;
 
-  GTK_WIDGET_CLASS (class)->save_state = example_app_window_save_state;
-  GTK_WIDGET_CLASS (class)->restore_state = example_app_window_restore_state;
-
   gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (class),
                                                "/org/gtk/exampleapp/window.ui");
 
@@ -344,6 +288,4 @@ example_app_window_open (ExampleAppWindow *win,
 
   update_words (win);
   update_lines (win);
-
-  win->files = g_list_append (win->files, g_object_ref (file));
 }

examples/application9/window.ui

@@ -4,7 +4,6 @@
     <property name="title" translatable="yes">Example Application</property>
     <property name="default-width">600</property>
     <property name="default-height">400</property>
-    <property name="save-id">window</property>
     <child type="titlebar">
       <object class="GtkHeaderBar" id="header">
         <child>
@@ -27,7 +26,6 @@
           <object class="GtkToggleButton" id="search">
             <property name="sensitive">0</property>
             <property name="icon-name">edit-find-symbolic</property>
-            <property name="save-id">search</property>
           </object>
         </child>
         <child type="end">
@@ -40,7 +38,6 @@
     <child>
       <object class="GtkBox" id="content_box">
         <property name="orientation">vertical</property>
-        <property name="save-id">content_box</property>
         <child>
           <object class="GtkSearchBar" id="searchbar">
             <child>
@@ -52,10 +49,8 @@
         </child>
         <child>
           <object class="GtkBox" id="hbox">
-            <property name="save-id">hbox</property>
             <child>
               <object class="GtkRevealer" id="sidebar">
-                <property name="save-id">sidebar</property>
                 <property name="transition-type">slide-right</property>
                 <child>
                   <object class="GtkScrolledWindow" id="sidebar-sw">
@@ -71,7 +66,6 @@
             </child>
             <child>
               <object class="GtkStack" id="stack">
-                <property name="save-id">stack</property>
                 <signal name="notify::visible-child" handler="visible_child_changed"/>
               </object>
             </child>

examples/bp/bloatpad.c

@@ -197,6 +197,17 @@ text_buffer_changed_cb (GtkTextBuffer *buffer,
     }
 }
 
+static void
+fullscreen_changed (GObject    *object,
+                    GParamSpec *pspec,
+                    gpointer    user_data)
+{
+  if (gtk_window_is_fullscreen (GTK_WINDOW (object)))
+    gtk_button_set_icon_name (GTK_BUTTON (user_data), "view-restore-symbolic");
+  else
+    gtk_button_set_icon_name (GTK_BUTTON (user_data), "view-fullscreen-symbolic");
+}
+
 static GActionEntry win_entries[] = {
   { "copy", window_copy, NULL, NULL, NULL },
   { "paste", window_paste, NULL, NULL, NULL },
@@ -214,17 +225,18 @@ new_window (GApplication *app,
   GtkWidget *window, *grid, *scrolled, *view;
   GtkWidget *toolbar;
   GtkWidget *button;
-  GtkWidget *sw, *box, *label;
 
   window = gtk_application_window_new (GTK_APPLICATION (app));
   gtk_window_set_default_size ((GtkWindow*)window, 640, 480);
   g_action_map_add_action_entries (G_ACTION_MAP (window), win_entries, G_N_ELEMENTS (win_entries), window);
   gtk_window_set_title (GTK_WINDOW (window), "Bloatpad");
+  gtk_application_window_set_show_menubar (GTK_APPLICATION_WINDOW (window), TRUE);
 
   grid = gtk_grid_new ();
   gtk_window_set_child (GTK_WINDOW (window), grid);
 
   toolbar = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+  gtk_widget_add_css_class (toolbar, "toolbar");
   button = gtk_toggle_button_new ();
   gtk_button_set_icon_name (GTK_BUTTON (button), "format-justify-left");
   gtk_actionable_set_detailed_action_name (GTK_ACTIONABLE (button), "win.justify::left");
@@ -240,21 +252,18 @@ new_window (GApplication *app,
   gtk_actionable_set_detailed_action_name (GTK_ACTIONABLE (button), "win.justify::right");
   gtk_box_append (GTK_BOX (toolbar), button);
 
-  box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
-  gtk_widget_set_halign (box, GTK_ALIGN_END);
-  label = gtk_label_new ("Fullscreen:");
-  gtk_box_append (GTK_BOX (box), label);
-  sw = gtk_switch_new ();
-  gtk_widget_set_valign (sw, GTK_ALIGN_CENTER);
-  gtk_actionable_set_action_name (GTK_ACTIONABLE (sw), "win.fullscreen");
-  gtk_box_append (GTK_BOX (box), sw);
-  gtk_box_append (GTK_BOX (toolbar), box);
+  button = gtk_toggle_button_new ();
+  gtk_button_set_icon_name (GTK_BUTTON (button), "view-fullscreen-symbolic");
+  gtk_actionable_set_action_name (GTK_ACTIONABLE (button), "win.fullscreen");
+  gtk_box_append (GTK_BOX (toolbar), button);
+  g_signal_connect (window, "notify::fullscreened", G_CALLBACK (fullscreen_changed), button);
 
   gtk_grid_attach (GTK_GRID (grid), toolbar, 0, 0, 1, 1);
 
   scrolled = gtk_scrolled_window_new ();
   gtk_widget_set_hexpand (scrolled, TRUE);
   gtk_widget_set_vexpand (scrolled, TRUE);
+  gtk_scrolled_window_set_has_frame (GTK_SCROLLED_WINDOW (scrolled), TRUE);
   view = gtk_text_view_new ();
 
   g_object_set_data ((GObject*)window, "bloatpad-text", view);
@@ -344,6 +353,7 @@ static void
 combo_changed (GtkComboBox *combo,
                gpointer     user_data)
 {
+  GtkDialog *dialog = user_data;
   GtkEntry *entry = g_object_get_data (user_data, "entry");
   const char *action;
   char **accels;
@@ -359,6 +369,17 @@ combo_changed (GtkComboBox *combo,
   g_strfreev (accels);
 
   gtk_editable_set_text (GTK_EDITABLE (entry), str);
+  gtk_dialog_set_response_sensitive (dialog, GTK_RESPONSE_APPLY, FALSE);
+}
+
+static void
+entry_changed (GtkEntry   *entry,
+               GParamSpec *pspec,
+               gpointer    user_data)
+{
+  GtkDialog *dialog = user_data;
+
+  gtk_dialog_set_response_sensitive (dialog, GTK_RESPONSE_APPLY, TRUE);
 }
 
 static void
@@ -372,7 +393,7 @@ response (GtkDialog *dialog,
   const char *str;
   char **accels;
 
-  if (response_id == GTK_RESPONSE_CLOSE)
+  if (response_id == GTK_RESPONSE_CANCEL)
     {
       gtk_window_destroy (GTK_WINDOW (dialog));
       return;
@@ -388,6 +409,8 @@ response (GtkDialog *dialog,
 
   gtk_application_set_accels_for_action (gtk_window_get_application (user_data), action, (const char **) accels);
   g_strfreev (accels);
+
+  gtk_dialog_set_response_sensitive (dialog, GTK_RESPONSE_APPLY, FALSE);
 }
 
 static void
@@ -402,22 +425,41 @@ edit_accels (GSimpleAction *action,
   GtkWidget *dialog;
   int i;
 
-  dialog = gtk_dialog_new ();
+  dialog = gtk_dialog_new_with_buttons ("Accelerators",
+                                        NULL,
+                                        GTK_DIALOG_USE_HEADER_BAR,
+                                        "Close", GTK_RESPONSE_CANCEL,
+                                        "Set", GTK_RESPONSE_APPLY,
+                                        NULL);
+
   gtk_window_set_application (GTK_WINDOW (dialog), app);
   actions = gtk_application_list_action_descriptions (app);
+
   combo = gtk_combo_box_text_new ();
+  g_object_set (gtk_dialog_get_content_area (GTK_DIALOG (dialog)),
+                "margin-top", 10,
+                "margin-bottom", 10,
+                "margin-start", 10,
+                "margin-end", 10,
+                "spacing", 10,
+                NULL);
+
   gtk_box_append (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))), combo);
   for (i = 0; actions[i]; i++)
     gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), actions[i], actions[i]);
   g_signal_connect (combo, "changed", G_CALLBACK (combo_changed), dialog);
+
   entry = gtk_entry_new ();
+  gtk_widget_set_hexpand (entry, TRUE);
+  g_signal_connect (entry, "notify::text", G_CALLBACK (entry_changed), dialog);
+
   gtk_box_append (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))), entry);
-  gtk_dialog_add_button (GTK_DIALOG (dialog), "Close", GTK_RESPONSE_CLOSE);
-  gtk_dialog_add_button (GTK_DIALOG (dialog), "Set", GTK_RESPONSE_APPLY);
   g_signal_connect (dialog, "response", G_CALLBACK (response), dialog);
   g_object_set_data (G_OBJECT (dialog), "combo", combo);
   g_object_set_data (G_OBJECT (dialog), "entry", entry);
 
+  gtk_combo_box_set_active (GTK_COMBO_BOX (combo), 0);
+
   gtk_widget_show (dialog);
 }
 
@@ -536,7 +578,7 @@ bloat_pad_startup (GApplication *application)
 
   menu = gtk_application_get_menu_by_id (GTK_APPLICATION (application), "icon-menu");
 
-  file = g_file_new_for_uri ("resource:///org/gtk/libgtk/icons/16x16/actions/gtk-select-color.png");
+  file = g_file_new_for_uri ("resource:///org/gtk/libgtk/icons/16x16/actions/insert-image.png");
   icon = g_file_icon_new (file);
   item = g_menu_item_new ("File Icon", NULL);
   g_menu_item_set_icon (item, icon);
@@ -552,7 +594,7 @@ bloat_pad_startup (GApplication *application)
   g_object_unref (item);
   g_object_unref (icon);
 
-  bytes = g_resources_lookup_data ("/org/gtk/libgtk/icons/16x16/actions/gtk-select-font.png", 0, NULL);
+  bytes = g_resources_lookup_data ("/org/gtk/libgtk/icons/16x16/actions/media-eject.png", 0, NULL);
   icon = g_bytes_icon_new (bytes);
   item = g_menu_item_new ("Bytes Icon", NULL);
   g_menu_item_set_icon (item, icon);
@@ -561,19 +603,19 @@ bloat_pad_startup (GApplication *application)
   g_object_unref (icon);
   g_bytes_unref (bytes);
 
-  icon = G_ICON (gdk_pixbuf_new_from_resource ("/org/gtk/libgtk/icons/16x16/actions/gtk-preferences.png", NULL));
+  icon = G_ICON (gdk_pixbuf_new_from_resource ("/org/gtk/libgtk/icons/16x16/actions/folder-new.png", NULL));
   item = g_menu_item_new ("Pixbuf", NULL);
   g_menu_item_set_icon (item, icon);
   g_menu_append_item (menu, item);
   g_object_unref (item);
   g_object_unref (icon);
 
-  file = g_file_new_for_uri ("resource:///org/gtk/libgtk/icons/16x16/actions/gtk-page-setup.png");
+  file = g_file_new_for_uri ("resource:///org/gtk/libgtk/icons/16x16/actions/bookmark-new.png");
   icon = g_file_icon_new (file);
   emblem = g_emblem_new (icon);
   g_object_unref (icon);
   g_object_unref (file);
-  file = g_file_new_for_uri ("resource:///org/gtk/libgtk/icons/16x16/actions/gtk-orientation-reverse-portrait.png");
+  file = g_file_new_for_uri ("resource:///org/gtk/libgtk/icons/16x16/actions/dialog-warning.png");
   icon2 = g_file_icon_new (file);
   icon = g_emblemed_icon_new (icon2, emblem);
   item = g_menu_item_new ("Emblemed Icon", NULL);

examples/bp/bloatpad.gresources.xml

@@ -4,5 +4,10 @@
   <gresource prefix="/org/gtk/bloatpad">
     <file preprocess="xml-stripblanks">gtk/menus.ui</file>
     <file preprocess="xml-stripblanks">gtk/help-overlay.ui</file>
+    <file>icons/16x16/actions/format-justify-center-symbolic.symbolic.png</file>
+    <file>icons/16x16/actions/format-justify-left-symbolic.symbolic.png</file>
+    <file>icons/16x16/actions/format-justify-right-symbolic.symbolic.png</file>
+    <file>icons/16x16/actions/view-fullscreen-symbolic.symbolic.png</file>
+    <file>icons/16x16/actions/view-restore-symbolic.symbolic.png</file>
   </gresource>
 </gresources>

examples/drawing.c

@@ -132,7 +132,6 @@ activate (GtkApplication *app,
           gpointer        user_data)
 {
   GtkWidget *window;
-  GtkWidget *frame;
   GtkWidget *drawing_area;
   GtkGesture *drag;
   GtkGesture *press;
@@ -142,14 +141,11 @@ activate (GtkApplication *app,
 
   g_signal_connect (window, "destroy", G_CALLBACK (close_window), NULL);
 
-  frame = gtk_frame_new (NULL);
-  gtk_window_set_child (GTK_WINDOW (window), frame);
-
   drawing_area = gtk_drawing_area_new ();
   /* set a minimum size */
   gtk_widget_set_size_request (drawing_area, 100, 100);
 
-  gtk_frame_set_child (GTK_FRAME (frame), drawing_area);
+  gtk_window_set_child (GTK_WINDOW (window), drawing_area);
 
   gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (drawing_area), draw_cb, NULL, NULL);
 

examples/hello/hello-world.c

@@ -13,19 +13,19 @@ activate (GtkApplication *app,
 {
   GtkWidget *window;
   GtkWidget *button;
-  GtkWidget *box;
 
   window = gtk_application_window_new (app);
   gtk_window_set_title (GTK_WINDOW (window), "Window");
   gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
 
-  box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
-  gtk_window_set_child (GTK_WINDOW (window), box);
-
   button = gtk_button_new_with_label ("Hello World");
+  gtk_widget_set_halign (button, GTK_ALIGN_CENTER);
+  gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
+
   g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
   g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_window_destroy), window);
-  gtk_box_append (GTK_BOX (box), button);
+
+  gtk_window_set_child (GTK_WINDOW (window), button);
 
   gtk_widget_show (window);
 }

examples/hello/meson.build

@@ -0,0 +1,10 @@
+project('hello', 'c',
+          version: '4.3.0',
+          meson_version: '>= 0.50.0',
+)
+
+executable('hello',
+  [ 'hello-world.c' ],
+  dependencies: [ dependency('gtk4') ],
+  install: false
+)

examples/labels.js

@@ -0,0 +1,50 @@
+#!/usr/bin/env -S GI_TYPELIB_PATH=${PWD}/build/gtk:${GI_TYPELIB_PATH} LD_PRELOAD=${LD_PRELOAD}:${PWD}/build/gtk/libgtk-4.so gjs
+
+imports.gi.versions['Gtk'] = '4.0';
+
+const GObject = imports.gi.GObject;
+const Gtk = imports.gi.Gtk;
+
+const DemoWidget = GObject.registerClass({
+  GTypeName: 'DemoWidget',
+  }, class DemoWidget extends Gtk.Widget {
+
+  _init(params = {}) {
+       super._init(params);
+
+       let layout_manager = new Gtk.GridLayout ();
+       this.set_layout_manager (layout_manager);
+       this.label1 = new Gtk.Label({ label: "Red",
+                                     hexpand: true,
+                                     vexpand: true });
+       this.label1.set_parent (this);
+       let child1 = layout_manager.get_layout_child (this.label1);
+       child1.set_row (0);
+       child1.set_column (0);
+
+       this.label2 = new Gtk.Label({ label: "Green",
+                                     hexpand: true,
+                                     vexpand: true });
+       this.label2.set_parent (this);
+       let child2 = layout_manager.get_layout_child (this.label2);
+       child2.set_row (0);
+       child2.set_column (1);
+    }
+});
+
+// Create a new application
+let app = new Gtk.Application({ application_id: 'org.gtk.exampleapp' });
+
+// When the application is launched…
+app.connect('activate', () => {
+    // … create a new window …
+    let win = new Gtk.ApplicationWindow({ application: app });
+    // … with a button in it …
+    let widget = new DemoWidget();
+    win.set_child(widget);
+    win.present();
+});
+
+// Run the application
+app.run([]);
+

examples/meson.build

@@ -2,7 +2,6 @@ examples = [
   'builder',
   'drawing',
   'grid-packing',
-  'hello-world',
   'plugman',
   'search-bar',
   'sunny',

examples/squares.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env -S GI_TYPELIB_PATH=${PWD}/build/gtk:${GI_TYPELIB_PATH} LD_PRELOAD=${LD_PRELOAD}:${PWD}/build/gtk/libgtk-4.so python3
+
+import gi
+
+gi.require_version('Gdk', '4.0')
+gi.require_version('Gtk', '4.0')
+
+from gi.repository import Gdk
+from gi.repository import Gtk
+from gi.repository import Graphene
+
+
+class DemoWidget(Gtk.Widget):
+
+    __gtype_name__ = "DemoWidget"
+
+    def __init__(self):
+        super().__init__()
+
+    def do_measure(self, orientation, for_size: int):
+        # We need some space to draw
+        return 100, 200, -1, -1
+
+    def do_snapshot(self, snapshot):
+        # Draw four color squares
+        color = Gdk.RGBA()
+        rect = Graphene.Rect.alloc()
+
+        width = self.get_width() / 2
+        height = self.get_height() / 2
+
+        Gdk.RGBA.parse(color, "red")
+        rect.init(0, 0, width, height)
+        snapshot.append_color(color, rect)
+
+        Gdk.RGBA.parse(color, "green")
+        rect.init(width, 0, width, height)
+        snapshot.append_color(color, rect)
+
+        Gdk.RGBA.parse(color, "yellow")
+        rect.init(0, height, width, height)
+        snapshot.append_color(color, rect)
+
+        Gdk.RGBA.parse(color, "blue")
+        rect.init(width, height, width, height)
+        snapshot.append_color(color, rect)
+
+def on_activate(app):
+    # Create a new window
+    win = Gtk.ApplicationWindow(application=app)
+    win.set_title("Squares")
+    icon = DemoWidget()
+    win.set_child(icon)
+    win.present()
+
+# Create a new application
+app = Gtk.Application(application_id='org.gtk.exampleapp')
+app.connect('activate', on_activate)
+
+# Run the application
+app.run(None)

examples/sunny.c

@@ -12,7 +12,7 @@ new_window (GApplication *app,
   gtk_application_window_set_show_menubar (GTK_APPLICATION_WINDOW (window), TRUE);
   gtk_window_set_default_size ((GtkWindow*)window, 640, 480);
   gtk_window_set_title (GTK_WINDOW (window), "Sunny");
-  gtk_window_set_icon_name (GTK_WINDOW (window), "sunny");
+  gtk_window_set_icon_name (GTK_WINDOW (window), "weather-clear-symbolic");
 
   header = gtk_header_bar_new ();
   gtk_window_set_titlebar (GTK_WINDOW (window), header);
@@ -78,7 +78,7 @@ show_about (GSimpleAction *action,
   gtk_show_about_dialog (NULL,
                          "program-name", "Sunny",
                          "title", "About Sunny",
-                         "logo-icon-name", "sunny",
+                         "logo-icon-name", "weather-clear-symbolic",
                          "comments", "A cheap Bloatpad clone.",
                          NULL);
 }

gdk/broadway/gdkbroadwaydisplay.h

@@ -48,6 +48,8 @@ void                    gdk_broadway_display_show_keyboard       (GdkBroadwayDis
 GDK_AVAILABLE_IN_ALL
 void                    gdk_broadway_display_hide_keyboard       (GdkBroadwayDisplay *display);
 
+GDK_AVAILABLE_IN_4_4
+int                     gdk_broadway_display_get_surface_scale   (GdkDisplay *display);
 GDK_AVAILABLE_IN_4_4
 void                    gdk_broadway_display_set_surface_scale   (GdkDisplay *display,
                                                                   int         scale);

gdk/broadway/gdkdisplay-broadway.c

@@ -361,6 +361,29 @@ gdk_broadway_display_set_surface_scale (GdkDisplay *display,
   gdk_monitor_set_scale_factor (self->monitor, scale);
 }
 
+/**
+ * gdk_broadway_display_get_surface_scale:
+ * @display: (type GdkBroadwayDisplay): the display
+ *
+ * Gets the surface scale that was previously set by the client or
+ * gdk_broadway_display_set_surface_scale().
+ *
+ * Returns: the scale for surfaces
+ *
+ * Since: 4.4
+ */
+int
+gdk_broadway_display_get_surface_scale (GdkDisplay *display)
+{
+  GdkBroadwayDisplay *self;
+
+  g_return_val_if_fail (GDK_IS_BROADWAY_DISPLAY (display), 1);
+
+  self = GDK_BROADWAY_DISPLAY (display);
+
+  return self->scale_factor;
+}
+
 static GListModel *
 gdk_broadway_display_get_monitors (GdkDisplay *display)
 {

gdk/gdk.c

@@ -127,7 +127,9 @@ static const GdkDebugKey gdk_debug_keys[] = {
   { "gl-legacy",       GDK_DEBUG_GL_LEGACY, "Use a legacy OpenGL context" },
   { "gl-gles",         GDK_DEBUG_GL_GLES, "Use a GLES OpenGL context" },
   { "gl-debug",        GDK_DEBUG_GL_DEBUG, "Insert debugging information in OpenGL" },
+  { "gl-egl",          GDK_DEBUG_GL_EGL, "Use EGL on X11 or Windows" },
   { "gl-glx",          GDK_DEBUG_GL_GLX, "Use GLX on X11" },
+  { "gl-wgl",          GDK_DEBUG_GL_WGL, "Use WGL on Windows" },
   { "vulkan-disable",  GDK_DEBUG_VULKAN_DISABLE, "Disable Vulkan support" },
   { "vulkan-validate", GDK_DEBUG_VULKAN_VALIDATE, "Load the Vulkan validation layer" },
   { "default-settings",GDK_DEBUG_DEFAULT_SETTINGS, "Force default values for xsettings" },
@@ -330,14 +332,13 @@ gdk_display_open_default (void)
 }
 
 /*< private >
- *
- * gdk_get_startup_notification_id
+ * gdk_get_startup_notification_id:
  *
  * Returns the original value of the DESKTOP_STARTUP_ID environment
  * variable if it was defined and valid, or %NULL otherwise.
  *
  * Returns: (nullable) (transfer none): the original value of the
- *   DESKTOP_STARTUP_ID environment variable, or %NULL.
+ *   DESKTOP_STARTUP_ID environment variable
  */
 const char *
 gdk_get_startup_notification_id (void)

gdk/gdkcursor.c

@@ -340,7 +340,7 @@ gdk_cursor_new_from_name (const char *name,
  * @texture: the texture providing the pixel data
  * @hotspot_x: the horizontal offset of the “hotspot” of the cursor
  * @hotspot_y: the vertical offset of the “hotspot” of the cursor
- * @fallback: (nullable): %NULL or the `GdkCursor` to fall back to when
+ * @fallback: (nullable): the `GdkCursor` to fall back to when
  *   this one cannot be supported
  *
  * Creates a new cursor from a `GdkTexture`.

gdk/gdkdebug.h

@@ -41,10 +41,12 @@ typedef enum {
   GDK_DEBUG_GL_LEGACY       = 1 << 15,
   GDK_DEBUG_GL_GLES         = 1 << 16,
   GDK_DEBUG_GL_DEBUG        = 1 << 17,
-  GDK_DEBUG_GL_GLX          = 1 << 18,
-  GDK_DEBUG_VULKAN_DISABLE  = 1 << 19,
-  GDK_DEBUG_VULKAN_VALIDATE = 1 << 20,
-  GDK_DEBUG_DEFAULT_SETTINGS= 1 << 21
+  GDK_DEBUG_GL_EGL          = 1 << 18,
+  GDK_DEBUG_GL_GLX          = 1 << 19,
+  GDK_DEBUG_GL_WGL          = 1 << 20,
+  GDK_DEBUG_VULKAN_DISABLE  = 1 << 21,
+  GDK_DEBUG_VULKAN_VALIDATE = 1 << 22,
+  GDK_DEBUG_DEFAULT_SETTINGS= 1 << 23,
 } GdkDebugFlags;
 
 extern guint _gdk_debug_flags;

gdk/gdkdisplay.c

@@ -77,6 +77,23 @@ enum {
   LAST_SIGNAL
 };
 
+typedef struct _GdkDisplayPrivate GdkDisplayPrivate;
+
+struct _GdkDisplayPrivate {
+  /* The base context that all other contexts inherit from.
+   * This context is never exposed to public API and is
+   * allowed to have a %NULL surface.
+   */
+  GdkGLContext *gl_context;
+  GError *gl_error;
+
+  guint rgba : 1;
+  guint composited : 1;
+  guint input_shapes : 1;
+
+  GdkDebugFlags debug_flags;
+};
+
 static void gdk_display_dispose     (GObject         *object);
 static void gdk_display_finalize    (GObject         *object);
 
@@ -85,7 +102,7 @@ static GdkAppLaunchContext *gdk_display_real_get_app_launch_context (GdkDisplay
 
 static guint signals[LAST_SIGNAL] = { 0 };
 
-G_DEFINE_TYPE (GdkDisplay, gdk_display, G_TYPE_OBJECT)
+G_DEFINE_TYPE_WITH_PRIVATE (GdkDisplay, gdk_display, G_TYPE_OBJECT)
 
 static void
 gdk_display_get_property (GObject    *object,
@@ -119,10 +136,14 @@ gdk_display_real_make_default (GdkDisplay *display)
 {
 }
 
-static void
-gdk_display_real_opened (GdkDisplay *display)
+static GdkGLContext *
+gdk_display_default_init_gl (GdkDisplay  *display,
+                             GError     **error)
 {
-  _gdk_display_manager_add_display (gdk_display_manager_get (), display);
+  g_set_error_literal (error, GDK_GL_ERROR, GDK_GL_ERROR_NOT_AVAILABLE,
+                       _("The current backend does not support OpenGL"));
+
+  return NULL;
 }
 
 static GdkSeat *
@@ -134,6 +155,12 @@ gdk_display_real_get_default_seat (GdkDisplay *display)
   return display->seats->data;
 }
 
+static void
+gdk_display_real_opened (GdkDisplay *display)
+{
+  _gdk_display_manager_add_display (gdk_display_manager_get (), display);
+}
+
 static void
 gdk_display_class_init (GdkDisplayClass *class)
 {
@@ -143,10 +170,11 @@ gdk_display_class_init (GdkDisplayClass *class)
   object_class->dispose = gdk_display_dispose;
   object_class->get_property = gdk_display_get_property;
 
-  class->get_app_launch_context = gdk_display_real_get_app_launch_context;
-  class->opened = gdk_display_real_opened;
   class->make_default = gdk_display_real_make_default;
+  class->get_app_launch_context = gdk_display_real_get_app_launch_context;
+  class->init_gl = gdk_display_default_init_gl;
   class->get_default_seat = gdk_display_real_get_default_seat;
+  class->opened = gdk_display_real_opened;
 
   /**
    * GdkDisplay:composited: (attributes org.gtk.Property.get=gdk_display_is_composited)
@@ -294,6 +322,8 @@ free_device_grabs_foreach (gpointer key,
 static void
 gdk_display_init (GdkDisplay *display)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   display->double_click_time = 250;
   display->double_click_distance = 5;
 
@@ -304,22 +334,26 @@ gdk_display_init (GdkDisplay *display)
 
   g_queue_init (&display->queued_events);
 
-  display->debug_flags = _gdk_debug_flags;
+  priv->debug_flags = _gdk_debug_flags;
 
-  display->composited = TRUE;
-  display->rgba = TRUE;
-  display->input_shapes = TRUE;
+  priv->composited = TRUE;
+  priv->rgba = TRUE;
+  priv->input_shapes = TRUE;
 }
 
 static void
 gdk_display_dispose (GObject *object)
 {
   GdkDisplay *display = GDK_DISPLAY (object);
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
 
   _gdk_display_manager_remove_display (gdk_display_manager_get (), display);
 
   g_queue_clear (&display->queued_events);
 
+  g_clear_object (&priv->gl_context);
+  g_clear_error (&priv->gl_error);
+
   G_OBJECT_CLASS (gdk_display_parent_class)->dispose (object);
 }
 
@@ -384,11 +418,11 @@ gdk_display_is_closed  (GdkDisplay  *display)
  * gdk_display_get_event:
  * @display: a `GdkDisplay`
  *
- * Gets the next `GdkEvent` to be processed for @display, fetching events from the
- * windowing system if necessary.
+ * Gets the next `GdkEvent` to be processed for @display,
+ * fetching events from the windowing system if necessary.
  *
- * Returns: (nullable) (transfer full): the next `GdkEvent` to be processed,
- *   or %NULL if no events are pending
+ * Returns: (nullable) (transfer full): the next `GdkEvent`
+ *   to be processed
  */
 GdkEvent *
 gdk_display_get_event (GdkDisplay *display)
@@ -998,21 +1032,25 @@ gdk_display_get_primary_clipboard (GdkDisplay *display)
 gboolean
 gdk_display_supports_input_shapes (GdkDisplay *display)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
 
-  return display->input_shapes;
+  return priv->input_shapes;
 }
 
 void
 gdk_display_set_input_shapes (GdkDisplay *display,
                               gboolean    input_shapes)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_if_fail (GDK_IS_DISPLAY (display));
 
-  if (display->input_shapes == input_shapes)
+  if (priv->input_shapes == input_shapes)
     return;
 
-  display->input_shapes = input_shapes;
+  priv->input_shapes = input_shapes;
 
   g_object_notify_by_pspec (G_OBJECT (display), props[PROP_INPUT_SHAPES]);
 }
@@ -1157,32 +1195,136 @@ gdk_display_get_keymap (GdkDisplay *display)
   return GDK_DISPLAY_GET_CLASS (display)->get_keymap (display);
 }
 
-/*< private >
- * gdk_display_make_gl_context_current:
- * @display: a `GdkDisplay`
- * @context: (optional): a `GdkGLContext`
- *
- * Makes the given @context the current GL context, or unsets
- * the current GL context if @context is %NULL.
- */
-gboolean
-gdk_display_make_gl_context_current (GdkDisplay   *display,
-                                     GdkGLContext *context)
+static void
+gdk_display_init_gl (GdkDisplay *self)
 {
-  return GDK_DISPLAY_GET_CLASS (display)->make_gl_context_current (display, context);
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (self);
+  GdkGLContext *context;
+  gint64 before G_GNUC_UNUSED;
+  gint64 before2 G_GNUC_UNUSED;
+
+  before = GDK_PROFILER_CURRENT_TIME;
+
+  if (GDK_DISPLAY_DEBUG_CHECK (self, GL_DISABLE))
+    {
+      g_set_error_literal (&priv->gl_error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_NOT_AVAILABLE,
+                           _("GL support disabled via GDK_DEBUG"));
+      return;
+    }
+
+  context = GDK_DISPLAY_GET_CLASS (self)->init_gl (self, &priv->gl_error);
+  if (context == NULL)
+    return;
+
+  before2 = GDK_PROFILER_CURRENT_TIME;
+
+  if (!gdk_gl_context_realize (context, &priv->gl_error))
+    {
+      g_object_unref (context);
+      return;
+    }
+
+  gdk_profiler_end_mark (before2, "realize OpenGL context", NULL);
+
+  /* Only assign after realize, so GdkGLContext::realize() can use
+   * gdk_display_get_gl_context() == NULL to differentiate between
+   * the display's context and any other context.
+   */
+  priv->gl_context = context;
+
+  gdk_profiler_end_mark (before, "initialize OpenGL", NULL);
+}
+
+/**
+ * gdk_display_prepare_gl:
+ * @self: a `GdkDisplay`
+ * @error: return location for a `GError`
+ *
+ * Checks that OpenGL is available for @self and ensures that it is
+ * properly initialized.
+ * When this fails, an @error will be set describing the error and this
+ * function returns %FALSE.
+ *
+ * Note that even if this function succeeds, creating a `GdkGLContext`
+ * may still fail.
+ *
+ * This function is idempotent. Calling it multiple times will just 
+ * return the same value or error.
+ *
+ * You never need to call this function, GDK will call it automatically
+ * as needed. But you can use it as a check when setting up code that
+ * might make use of OpenGL.
+ *
+ * Returns: %TRUE if the display supports OpenGL
+ *
+ * Since: 4.4
+ **/
+gboolean
+gdk_display_prepare_gl (GdkDisplay  *self,
+                        GError     **error)
+{
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (self);
+
+  g_return_val_if_fail (GDK_IS_DISPLAY (self), FALSE);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  for (;;)
+    {
+      if (priv->gl_context)
+        return TRUE;
+
+      if (priv->gl_error != NULL)
+        {
+          if (error)
+            *error = g_error_copy (priv->gl_error);
+
+
+          return FALSE;
+        }
+
+      gdk_display_init_gl (self);
+
+      /* try again */
+    }
+}
+
+/*< private >
+ * gdk_display_get_gl_context:
+ * @self: the `GdkDisplay`
+ *
+ * Gets the GL context returned from [vfunc@Gdk.Display.init_gl]
+ * previously.
+ *
+ * If that function has not been called yet or did fail, %NULL is
+ * returned.
+ * Call [method@Gdk.Display.prepare_gl] to avoid this.
+ *
+ * Returns: The `GdkGLContext`
+ */
+GdkGLContext *
+gdk_display_get_gl_context (GdkDisplay *self)
+{
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (self);
+
+  return priv->gl_context;
 }
 
 GdkDebugFlags
 gdk_display_get_debug_flags (GdkDisplay *display)
 {
-  return display ? display->debug_flags : _gdk_debug_flags;
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
+  return display ? priv->debug_flags : _gdk_debug_flags;
 }
 
 void
 gdk_display_set_debug_flags (GdkDisplay    *display,
                              GdkDebugFlags  flags)
 {
-  display->debug_flags = flags;
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
+  priv->debug_flags = flags;
 }
 
 /**
@@ -1207,21 +1349,25 @@ gdk_display_set_debug_flags (GdkDisplay    *display,
 gboolean
 gdk_display_is_composited (GdkDisplay *display)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
 
-  return display->composited;
+  return priv->composited;
 }
 
 void
 gdk_display_set_composited (GdkDisplay *display,
                             gboolean    composited)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_if_fail (GDK_IS_DISPLAY (display));
 
-  if (display->composited == composited)
+  if (priv->composited == composited)
     return;
 
-  display->composited = composited;
+  priv->composited = composited;
 
   g_object_notify_by_pspec (G_OBJECT (display), props[PROP_COMPOSITED]);
 }
@@ -1248,21 +1394,25 @@ gdk_display_set_composited (GdkDisplay *display,
 gboolean
 gdk_display_is_rgba (GdkDisplay *display)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
 
-  return display->rgba;
+  return priv->rgba;
 }
 
 void
 gdk_display_set_rgba (GdkDisplay *display,
                       gboolean    rgba)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_if_fail (GDK_IS_DISPLAY (display));
 
-  if (display->rgba == rgba)
+  if (priv->rgba == rgba)
     return;
 
-  display->rgba = rgba;
+  priv->rgba = rgba;
 
   g_object_notify_by_pspec (G_OBJECT (display), props[PROP_RGBA]);
 }

gdk/gdkdisplay.h

@@ -68,6 +68,10 @@ gboolean    gdk_display_is_rgba            (GdkDisplay  *display);
 GDK_AVAILABLE_IN_ALL
 gboolean    gdk_display_supports_input_shapes (GdkDisplay    *display);
 
+GDK_AVAILABLE_IN_4_4
+gboolean    gdk_display_prepare_gl         (GdkDisplay  *self,
+                                            GError     **error);
+
 GDK_AVAILABLE_IN_ALL
 GdkDisplay *gdk_display_get_default (void);
 

gdk/gdkdisplaymanager.c

@@ -323,7 +323,8 @@ gdk_display_manager_get_default_display (GdkDisplayManager *manager)
  * Gets the default `GdkDisplay`.
  *
  * This is a convenience function for:
- * `gdk_display_manager_get_default_display (gdk_display_manager_get ())`.
+ *
+ *     gdk_display_manager_get_default_display (gdk_display_manager_get ())
  *
  * Returns: (nullable) (transfer none): a `GdkDisplay`, or %NULL if
  *   there is no default display

gdk/gdkdisplayprivate.h

@@ -102,11 +102,6 @@ struct _GdkDisplay
 
   guint vulkan_refcount;
 #endif /* GDK_RENDERING_VULKAN */
-  guint rgba : 1;
-  guint composited : 1;
-  guint input_shapes : 1;
-
-  GdkDebugFlags debug_flags;
 
   GList *seats;
 };
@@ -145,8 +140,8 @@ struct _GdkDisplayClass
 
   GdkKeymap *                (*get_keymap)         (GdkDisplay    *display);
 
-  gboolean               (*make_gl_context_current)    (GdkDisplay        *display,
-                                                        GdkGLContext      *context);
+  GdkGLContext *         (*init_gl)                    (GdkDisplay        *display,
+                                                        GError           **error);
 
   GdkSeat *              (*get_default_seat)           (GdkDisplay     *display);
 
@@ -211,8 +206,7 @@ GdkSurface *        gdk_display_create_surface        (GdkDisplay       *display
                                                        int               width,
                                                        int               height);
 
-gboolean            gdk_display_make_gl_context_current  (GdkDisplay        *display,
-                                                          GdkGLContext      *context);
+GdkGLContext *      gdk_display_get_gl_context        (GdkDisplay       *display);
 
 void                gdk_display_set_rgba              (GdkDisplay       *display,
                                                        gboolean          rgba);

gdk/gdkdrawcontext.c

@@ -43,6 +43,7 @@
 typedef struct _GdkDrawContextPrivate GdkDrawContextPrivate;
 
 struct _GdkDrawContextPrivate {
+  GdkDisplay *display;
   GdkSurface *surface;
 
   cairo_region_t *frame_region;
@@ -77,6 +78,7 @@ gdk_draw_context_dispose (GObject *gobject)
       priv->surface->draw_contexts = g_slist_remove (priv->surface->draw_contexts, context);
       g_clear_object (&priv->surface);
     }
+  g_clear_object (&priv->display);
 
   G_OBJECT_CLASS (gdk_draw_context_parent_class)->dispose (gobject);
 }
@@ -92,10 +94,31 @@ gdk_draw_context_set_property (GObject      *gobject,
 
   switch (prop_id)
     {
+    case PROP_DISPLAY:
+      if (priv->display != NULL)
+        {
+          g_assert (g_value_get_object (value) == NULL);
+        }
+      else
+        {
+          priv->display = g_value_dup_object (value);
+        }
+      break;
+
     case PROP_SURFACE:
       priv->surface = g_value_dup_object (value);
-      g_assert (priv->surface != NULL);
-      priv->surface->draw_contexts = g_slist_prepend (priv->surface->draw_contexts, context);
+      if (priv->surface)
+        {
+          priv->surface->draw_contexts = g_slist_prepend (priv->surface->draw_contexts, context);
+          if (priv->display)
+            {
+              g_assert (priv->display == gdk_surface_get_display (priv->surface));
+            }
+          else
+            {
+              priv->display = g_object_ref (gdk_surface_get_display (priv->surface));
+            }
+        }
       break;
 
     default:
@@ -148,7 +171,8 @@ gdk_draw_context_class_init (GdkDrawContextClass *klass)
                          P_("Display"),
                          P_("The GDK display used to create the context"),
                          GDK_TYPE_DISPLAY,
-                         G_PARAM_READABLE |
+                         G_PARAM_READWRITE |
+                         G_PARAM_CONSTRUCT_ONLY |
                          G_PARAM_STATIC_STRINGS);
 
   /**
@@ -228,7 +252,7 @@ gdk_draw_context_get_display (GdkDrawContext *context)
 
   g_return_val_if_fail (GDK_IS_DRAW_CONTEXT (context), NULL);
 
-  return priv->surface ? gdk_surface_get_display (priv->surface) : NULL;
+  return priv->display;
 }
 
 /**

gdk/gdkdrop.c

@@ -294,8 +294,11 @@ gdk_drop_finalize (GObject *object)
 
   /* someone forgot to send a LEAVE signal */
   g_warn_if_fail (!priv->entered);
+
   /* Should we emit finish() here if necessary?
-   * For now that's the backends' job */
+   * For now that's the backends' job
+   */
+  g_warn_if_fail (priv->state != GDK_DROP_STATE_DROPPING);
 
   g_clear_object (&priv->device);
   g_clear_object (&priv->drag);
@@ -571,7 +574,7 @@ gdk_drop_get_drag (GdkDrop *self)
  * the ones provided by [method@Gdk.Drop.get_actions]. Those actions may
  * change in the future, even depending on the actions you provide here.
  *
- * The @preferred action is a hint to the drag'n'drop mechanism about which
+ * The @preferred action is a hint to the drag-and-drop mechanism about which
  * action to use when multiple actions are possible.
  *
  * This function should be called by drag destinations in response to
@@ -862,7 +865,7 @@ gdk_drop_read_value_internal (GdkDrop             *self,
  * then call [method@Gdk.Drop.read_value_finish] to get the resulting
  * `GValue`.
  *
- * For local drag'n'drop operations that are available in the given
+ * For local drag-and-drop operations that are available in the given
  * `GType`, the value will be copied directly. Otherwise, GDK will
  * try to use [func@Gdk.content_deserialize_async] to convert the data.
  */

gdk/gdkframeclock.c

@@ -481,11 +481,11 @@ _gdk_frame_clock_begin_frame (GdkFrameClock *frame_clock)
  * for the current frame or a recent frame.
  *
  * The `GdkFrameTimings` object may not yet be complete: see
- * [method@Gdk.FrameTimings.get_complete].
+ * [method@Gdk.FrameTimings.get_complete] and
+ * [method@Gdk.FrameClock.get_history_start].
  *
  * Returns: (nullable) (transfer none): the `GdkFrameTimings` object
- *   for the specified frame, or %NULL if it is not available. See
- *   [method@Gdk.FrameClock.get_history_start].
+ *   for the specified frame, or %NULL if it is not available
  */
 GdkFrameTimings *
 gdk_frame_clock_get_timings (GdkFrameClock *frame_clock,

gdk/gdkglcontext.c

@@ -89,8 +89,6 @@
 #include <epoxy/gl.h>
 
 typedef struct {
-  GdkGLContext *shared_context;
-
   int major;
   int minor;
   int gl_version;
@@ -127,7 +125,28 @@ G_DEFINE_QUARK (gdk-gl-error-quark, gdk_gl_error)
 
 G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GdkGLContext, gdk_gl_context, GDK_TYPE_DRAW_CONTEXT)
 
-static GPrivate thread_current_context = G_PRIVATE_INIT (g_object_unref);
+typedef struct _MaskedContext MaskedContext;
+
+static inline MaskedContext *
+mask_context (GdkGLContext *context,
+              gboolean      surfaceless)
+{
+  return (MaskedContext *) GSIZE_TO_POINTER (GPOINTER_TO_SIZE (context) | (surfaceless ? 1 : 0));
+}
+
+static inline GdkGLContext *
+unmask_context (MaskedContext *mask)
+{
+  return GDK_GL_CONTEXT (GSIZE_TO_POINTER (GPOINTER_TO_SIZE (mask) & ~(gsize) 1));
+}
+
+static void
+unref_unmasked (gpointer data)
+{
+  g_object_unref (unmask_context (data));
+}
+
+static GPrivate thread_current_context = G_PRIVATE_INIT (unref_unmasked);
 
 static void
 gdk_gl_context_clear_old_updated_area (GdkGLContext *context)
@@ -144,17 +163,14 @@ static void
 gdk_gl_context_dispose (GObject *gobject)
 {
   GdkGLContext *context = GDK_GL_CONTEXT (gobject);
-  GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
-  GdkGLContext *current;
+  MaskedContext *current;
 
   gdk_gl_context_clear_old_updated_area (context);
 
   current = g_private_get (&thread_current_context);
-  if (current == context)
+  if (unmask_context (current) == context)
     g_private_replace (&thread_current_context, NULL);
 
-  g_clear_object (&priv->shared_context);
-
   G_OBJECT_CLASS (gdk_gl_context_parent_class)->dispose (gobject);
 }
 
@@ -174,17 +190,10 @@ gdk_gl_context_set_property (GObject      *gobject,
                              const GValue *value,
                              GParamSpec   *pspec)
 {
-  GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private ((GdkGLContext *) gobject);
-
   switch (prop_id)
     {
     case PROP_SHARED_CONTEXT:
-      {
-        GdkGLContext *context = g_value_get_object (value);
-
-        if (context != NULL)
-          priv->shared_context = g_object_ref (context);
-      }
+      g_assert (g_value_get_object (value) == NULL);
       break;
 
     default:
@@ -198,12 +207,10 @@ gdk_gl_context_get_property (GObject    *gobject,
                              GValue     *value,
                              GParamSpec *pspec)
 {
-  GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private ((GdkGLContext *) gobject);
-
   switch (prop_id)
     {
     case PROP_SHARED_CONTEXT:
-      g_value_set_object (value, priv->shared_context);
+      g_value_set_object (value, NULL);
       break;
 
     default:
@@ -333,23 +340,27 @@ gdk_gl_context_real_get_damage (GdkGLContext *context)
                                         });
 }
 
+static gboolean
+gdk_gl_context_real_is_shared (GdkGLContext *self,
+                               GdkGLContext *other)
+{
+  if (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (self)) != gdk_draw_context_get_display (GDK_DRAW_CONTEXT (other)))
+    return FALSE;
+
+  /* XXX: Should we check es or legacy here? */
+
+  return TRUE;
+}
+
 static void
 gdk_gl_context_real_begin_frame (GdkDrawContext *draw_context,
                                  cairo_region_t *region)
 {
   GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
   GdkSurface *surface;
-  GdkGLContext *shared;
   cairo_region_t *damage;
   int ww, wh;
 
-  shared = gdk_gl_context_get_shared_context (context);
-  if (shared)
-    {
-      GDK_DRAW_CONTEXT_GET_CLASS (GDK_DRAW_CONTEXT (shared))->begin_frame (GDK_DRAW_CONTEXT (shared), region);
-      return;
-    }
-
   damage = GDK_GL_CONTEXT_GET_CLASS (context)->get_damage (context);
 
   if (context->old_updated_area[1])
@@ -379,15 +390,6 @@ static void
 gdk_gl_context_real_end_frame (GdkDrawContext *draw_context,
                                cairo_region_t *painted)
 {
-  GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
-  GdkGLContext *shared;
-
-  shared = gdk_gl_context_get_shared_context (context);
-  if (shared)
-    {
-      GDK_DRAW_CONTEXT_GET_CLASS (GDK_DRAW_CONTEXT (shared))->end_frame (GDK_DRAW_CONTEXT (shared), painted);
-      return;
-    }
 }
 
 static void
@@ -406,6 +408,7 @@ gdk_gl_context_class_init (GdkGLContextClass *klass)
 
   klass->realize = gdk_gl_context_real_realize;
   klass->get_damage = gdk_gl_context_real_get_damage;
+  klass->is_shared = gdk_gl_context_real_is_shared;
 
   draw_context_class->begin_frame = gdk_gl_context_real_begin_frame;
   draw_context_class->end_frame = gdk_gl_context_real_end_frame;
@@ -414,7 +417,13 @@ gdk_gl_context_class_init (GdkGLContextClass *klass)
   /**
    * GdkGLContext:shared-context: (attributes org.gtk.Property.get=gdk_gl_context_get_shared_context)
    *
-   * The `GdkGLContext` that this context is sharing data with, or %NULL
+   * Always %NULL
+   *
+   * As many contexts can share data now and no single shared context exists
+   * anymore, this function has been deprecated and now always returns %NULL.
+   *
+   * Deprecated: 4.4: Use [method@Gdk.GLContext.is_shared] to check if contexts
+   *   can be shared.
    */
   obj_pspecs[PROP_SHARED_CONTEXT] =
     g_param_spec_object ("shared-context",
@@ -423,7 +432,8 @@ gdk_gl_context_class_init (GdkGLContextClass *klass)
                          GDK_TYPE_GL_CONTEXT,
                          G_PARAM_READWRITE |
                          G_PARAM_CONSTRUCT_ONLY |
-                         G_PARAM_STATIC_STRINGS);
+                         G_PARAM_STATIC_STRINGS |
+                         G_PARAM_DEPRECATED);
 
   gobject_class->set_property = gdk_gl_context_set_property;
   gobject_class->get_property = gdk_gl_context_get_property;
@@ -441,6 +451,21 @@ gdk_gl_context_init (GdkGLContext *self)
   priv->use_es = -1;
 }
 
+/* Must have called gdk_display_prepare_gl() before */
+GdkGLContext *
+gdk_gl_context_new_for_surface (GdkSurface *surface)
+{
+  GdkDisplay *display = gdk_surface_get_display (surface);
+  GdkGLContext *shared = gdk_display_get_gl_context (display);
+
+  /* assert gdk_display_prepare_gl() had been called */
+  g_assert (shared);
+
+  return g_object_new (G_OBJECT_TYPE (shared),
+                       "surface", surface,
+                       NULL);
+}
+
 GdkGLContextPaintData *
 gdk_gl_context_get_paint_data (GdkGLContext *context)
 {
@@ -812,6 +837,42 @@ gdk_gl_context_set_is_legacy (GdkGLContext *context,
   priv->is_legacy = !!is_legacy;
 }
 
+/**
+ * gdk_gl_context_is_shared:
+ * @self: a `GdkGLContext`
+ * @other: the `GdkGLContext` that should be compatible with @self
+ *
+ * Checks if the two GL contexts can share resources.
+ *
+ * When they can, the texture IDs from @other can be used in @self. This
+ * is particularly useful when passing `GdkGLTexture` objects between
+ * different contexts.
+ *
+ * Contexts created for the same display with the same properties will
+ * always be compatible, even if they are created for different surfaces.
+ * For other contexts it depends on the GL backend.
+ *
+ * Both contexts must be realized for this check to succeed. If either one
+ * is not, this function will return %FALSE.
+ *
+ * Returns: %TRUE if the two GL contexts are compatible.
+ */
+gboolean
+gdk_gl_context_is_shared (GdkGLContext *self,
+                          GdkGLContext *other)
+{
+  GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (self);
+  GdkGLContextPrivate *priv_other = gdk_gl_context_get_instance_private (other);
+
+  g_return_val_if_fail (GDK_IS_GL_CONTEXT (self), FALSE);
+  g_return_val_if_fail (GDK_IS_GL_CONTEXT (other), FALSE);
+
+  if (!priv->realized || !priv_other->realized)
+    return FALSE;
+
+  return GDK_GL_CONTEXT_GET_CLASS (self)->is_shared (self, other);
+}
+
 /**
  * gdk_gl_context_set_use_es:
  * @context: a `GdkGLContext`
@@ -1092,12 +1153,16 @@ void
 gdk_gl_context_make_current (GdkGLContext *context)
 {
   GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
-  GdkGLContext *current;
+  MaskedContext *current, *masked_context;
+  gboolean surfaceless;
 
   g_return_if_fail (GDK_IS_GL_CONTEXT (context));
 
+  surfaceless = !gdk_draw_context_is_in_frame (GDK_DRAW_CONTEXT (context));
+  masked_context = mask_context (context, surfaceless);
+
   current = g_private_get (&thread_current_context);
-  if (current == context)
+  if (current == masked_context)
     return;
 
   /* we need to realize the GdkGLContext if it wasn't explicitly realized */
@@ -1114,11 +1179,15 @@ gdk_gl_context_make_current (GdkGLContext *context)
         }
     }
 
-  if (gdk_display_make_gl_context_current (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context)), context))
+  if (!GDK_GL_CONTEXT_GET_CLASS (context)->make_current (context, surfaceless))
     {
-      g_private_replace (&thread_current_context, g_object_ref (context));
-      gdk_gl_context_check_extensions (context);
+      g_warning ("gdk_gl_context_make_current() failed");
+      return;
     }
+
+  g_object_ref (context);
+  g_private_replace (&thread_current_context, masked_context);
+  gdk_gl_context_check_extensions (context);
 }
 
 /**
@@ -1157,18 +1226,22 @@ gdk_gl_context_get_surface (GdkGLContext *context)
  * gdk_gl_context_get_shared_context: (attributes org.gtk.Method.get_property=shared-context)
  * @context: a `GdkGLContext`
  *
- * Retrieves the `GdkGLContext` that this @context share data with.
+ * Used to retrieves the `GdkGLContext` that this @context share data with.
  *
- * Returns: (nullable) (transfer none): a `GdkGLContext`
+ * As many contexts can share data now and no single shared context exists
+ * anymore, this function has been deprecated and now always returns %NULL.
+ *
+ * Returns: (nullable) (transfer none): %NULL
+ *
+ * Deprecated: 4.4: Use [method@Gdk.GLContext.is_shared] to check if contexts
+ *   can be shared.
  */
 GdkGLContext *
 gdk_gl_context_get_shared_context (GdkGLContext *context)
 {
-  GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
-
   g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
 
-  return priv->shared_context;
+  return NULL;
 }
 
 /**
@@ -1208,12 +1281,14 @@ gdk_gl_context_get_version (GdkGLContext *context,
 void
 gdk_gl_context_clear_current (void)
 {
-  GdkGLContext *current;
+  MaskedContext *current;
 
   current = g_private_get (&thread_current_context);
   if (current != NULL)
     {
-      if (gdk_display_make_gl_context_current (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (current)), NULL))
+      GdkGLContext *context = unmask_context (current);
+
+      if (GDK_GL_CONTEXT_GET_CLASS (context)->clear_current (context))
         g_private_replace (&thread_current_context, NULL);
     }
 }
@@ -1228,11 +1303,11 @@ gdk_gl_context_clear_current (void)
 GdkGLContext *
 gdk_gl_context_get_current (void)
 {
-  GdkGLContext *current;
+  MaskedContext *current;
 
   current = g_private_get (&thread_current_context);
 
-  return current;
+  return unmask_context (current);
 }
 
 gboolean

gdk/gdkglcontext.h

@@ -45,8 +45,8 @@ GType gdk_gl_context_get_type (void) G_GNUC_CONST;
 GDK_AVAILABLE_IN_ALL
 GdkDisplay *            gdk_gl_context_get_display              (GdkGLContext  *context);
 GDK_AVAILABLE_IN_ALL
-GdkSurface *             gdk_gl_context_get_surface               (GdkGLContext  *context);
-GDK_AVAILABLE_IN_ALL
+GdkSurface *            gdk_gl_context_get_surface               (GdkGLContext  *context);
+GDK_DEPRECATED_IN_4_4_FOR(gdk_gl_context_is_shared)
 GdkGLContext *          gdk_gl_context_get_shared_context       (GdkGLContext  *context);
 GDK_AVAILABLE_IN_ALL
 void                    gdk_gl_context_get_version              (GdkGLContext  *context,
@@ -54,6 +54,9 @@ void                    gdk_gl_context_get_version              (GdkGLContext  *
                                                                  int           *minor);
 GDK_AVAILABLE_IN_ALL
 gboolean                gdk_gl_context_is_legacy                (GdkGLContext  *context);
+GDK_AVAILABLE_IN_4_4
+gboolean                gdk_gl_context_is_shared                (GdkGLContext  *self,
+                                                                 GdkGLContext  *other);
 
 GDK_AVAILABLE_IN_ALL
 void                    gdk_gl_context_set_required_version     (GdkGLContext  *context,

gdk/gdkglcontextprivate.h

@@ -27,6 +27,13 @@
 
 G_BEGIN_DECLS
 
+/* Version requirements for EGL contexts.
+ *
+ * If you add support for EGL to your backend, please require this.
+ */
+#define GDK_EGL_MIN_VERSION_MAJOR (1)
+#define GDK_EGL_MIN_VERSION_MINOR (4)
+
 #define GDK_GL_CONTEXT_CLASS(klass)	(G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_GL_CONTEXT, GdkGLContextClass))
 #define GDK_IS_GL_CONTEXT_CLASS(klass)	(G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_GL_CONTEXT))
 #define GDK_GL_CONTEXT_GET_CLASS(obj)	(G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_GL_CONTEXT, GdkGLContextClass))
@@ -45,10 +52,16 @@ struct _GdkGLContextClass
 {
   GdkDrawContextClass parent_class;
 
-  gboolean (* realize) (GdkGLContext *context,
-                        GError **error);
+  gboolean              (* realize)                             (GdkGLContext          *context,
+                                                                 GError               **error);
 
-  cairo_region_t * (* get_damage) (GdkGLContext *context);
+  gboolean              (* make_current)                        (GdkGLContext          *context,
+                                                                 gboolean               surfaceless);
+  gboolean              (* clear_current)                       (GdkGLContext          *context);
+  cairo_region_t *      (* get_damage)                          (GdkGLContext          *context);
+
+  gboolean              (* is_shared)                           (GdkGLContext          *self,
+                                                                 GdkGLContext          *other);
 };
 
 typedef struct {
@@ -73,6 +86,8 @@ typedef struct {
   guint use_es : 1;
 } GdkGLContextPaintData;
 
+GdkGLContext *          gdk_gl_context_new_for_surface          (GdkSurface      *surface);
+
 void                    gdk_gl_context_set_is_legacy            (GdkGLContext    *context,
                                                                  gboolean         is_legacy);
 

gdk/gdkmemorytexture.h

@@ -53,8 +53,8 @@ G_BEGIN_DECLS
  * CAIRO_FORMAT_ARGB32 is represented by different `GdkMemoryFormats`
  * on architectures with different endiannesses.
  *
- * Its naming is modelled after VkFormat (see
- * https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#VkFormat
+ * Its naming is modelled after
+ * [VkFormat](https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#VkFormat)
  * for details).
  */
 typedef enum {

gdk/gdksurface.c

@@ -1065,87 +1065,23 @@ gdk_surface_get_mapped (GdkSurface *surface)
   return GDK_SURFACE_IS_MAPPED (surface);
 }
 
-GdkGLContext *
-gdk_surface_get_shared_data_gl_context (GdkSurface *surface)
-{
-  static int in_shared_data_creation;
-  GdkDisplay *display;
-  GdkGLContext *context;
-
-  if (in_shared_data_creation)
-    return NULL;
-
-  in_shared_data_creation = 1;
-
-  display = gdk_surface_get_display (surface);
-  context = (GdkGLContext *)g_object_get_data (G_OBJECT (display), "gdk-gl-shared-data-context");
-  if (context == NULL)
-    {
-      GError *error = NULL;
-      context = GDK_SURFACE_GET_CLASS (surface)->create_gl_context (surface, FALSE, NULL, &error);
-      if (context == NULL)
-        {
-          g_warning ("Failed to create shared context: %s", error->message);
-          g_clear_error (&error);
-        }
-
-      gdk_gl_context_realize (context, &error);
-      if (context == NULL)
-        {
-          g_warning ("Failed to realize shared context: %s", error->message);
-          g_clear_error (&error);
-        }
-
-
-      g_object_set_data (G_OBJECT (display), "gdk-gl-shared-data-context", context);
-    }
-
-  in_shared_data_creation = 0;
-
-  return context;
-}
-
 GdkGLContext *
 gdk_surface_get_paint_gl_context (GdkSurface  *surface,
-                                  GError    **error)
+                                  GError     **error)
 {
-  GError *internal_error = NULL;
-
-  if (GDK_DISPLAY_DEBUG_CHECK (surface->display, GL_DISABLE))
-    {
-      g_set_error_literal (error, GDK_GL_ERROR,
-                           GDK_GL_ERROR_NOT_AVAILABLE,
-                           _("GL support disabled via GDK_DEBUG"));
-      return NULL;
-    }
+  if (!gdk_display_prepare_gl (surface->display, error))
+    return NULL;
 
   if (surface->gl_paint_context == NULL)
     {
-      GdkSurfaceClass *class = GDK_SURFACE_GET_CLASS (surface);
-
-      if (class->create_gl_context == NULL)
-        {
-          g_set_error_literal (error, GDK_GL_ERROR, GDK_GL_ERROR_NOT_AVAILABLE,
-                               _("The current backend does not support OpenGL"));
-          return NULL;
-        }
-
-      surface->gl_paint_context =
-        class->create_gl_context (surface, TRUE, NULL, &internal_error);
+      surface->gl_paint_context = gdk_surface_create_gl_context (surface, error);
+      if (surface->gl_paint_context == NULL)
+        return NULL;
     }
 
-  if (internal_error != NULL)
+  if (!gdk_gl_context_realize (surface->gl_paint_context, error))
     {
-      g_propagate_error (error, internal_error);
-      g_clear_object (&(surface->gl_paint_context));
-      return NULL;
-    }
-
-  gdk_gl_context_realize (surface->gl_paint_context, &internal_error);
-  if (internal_error != NULL)
-    {
-      g_propagate_error (error, internal_error);
-      g_clear_object (&(surface->gl_paint_context));
+      g_clear_object (&surface->gl_paint_context);
       return NULL;
     }
 
@@ -1170,19 +1106,13 @@ GdkGLContext *
 gdk_surface_create_gl_context (GdkSurface   *surface,
                                GError      **error)
 {
-  GdkGLContext *paint_context;
-
   g_return_val_if_fail (GDK_IS_SURFACE (surface), NULL);
   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
 
-  paint_context = gdk_surface_get_paint_gl_context (surface, error);
-  if (paint_context == NULL)
+  if (!gdk_display_prepare_gl (surface->display, error))
     return NULL;
 
-  return GDK_SURFACE_GET_CLASS (surface)->create_gl_context (surface,
-                                                             FALSE,
-                                                             paint_context,
-                                                             error);
+  return gdk_gl_context_new_for_surface (surface);
 }
 
 /**

gdk/gdksurfaceprivate.h

@@ -160,10 +160,6 @@ struct _GdkSurfaceClass
 
   void         (* set_opaque_region)      (GdkSurface      *surface,
                                            cairo_region_t *region);
-  GdkGLContext *(*create_gl_context)      (GdkSurface      *surface,
-                                           gboolean        attached,
-                                           GdkGLContext   *share,
-                                           GError        **error);
   void         (* request_layout)         (GdkSurface     *surface);
   gboolean     (* compute_size)           (GdkSurface     *surface);
 };
@@ -266,7 +262,6 @@ void       _gdk_surface_update_size       (GdkSurface      *surface);
 
 GdkGLContext * gdk_surface_get_paint_gl_context (GdkSurface *surface,
                                                  GError   **error);
-GdkGLContext * gdk_surface_get_shared_data_gl_context (GdkSurface *surface);
 
 gboolean gdk_surface_handle_event (GdkEvent       *event);
 GdkSeat * gdk_surface_get_seat_from_event (GdkSurface *surface,

gdk/gdktexture.c

@@ -533,7 +533,7 @@ gdk_texture_get_render_data (GdkTexture  *self,
 /**
  * gdk_texture_save_to_png:
  * @texture: a `GdkTexture`
- * @filename: the filename to store to
+ * @filename: (type filename): the filename to store to
  *
  * Store the given @texture to the @filename as a PNG file.
  *

gdk/macos/GdkMacosWindow.c

@@ -28,7 +28,9 @@
 #import "GdkMacosGLView.h"
 #import "GdkMacosWindow.h"
 
+#include "gdkmacosclipboard-private.h"
 #include "gdkmacosdisplay-private.h"
+#include "gdkmacosdrop-private.h"
 #include "gdkmacosmonitor-private.h"
 #include "gdkmacossurface-private.h"
 #include "gdkmacospopupsurface-private.h"
@@ -287,6 +289,9 @@ typedef NSString *CALayerContentsGravity;
   [self setContentView:view];
   [view release];
 
+  /* TODO: We might want to make this more extensible at some point */
+  _gdk_macos_clipboard_register_drag_types (self);
+
   return self;
 }
 
@@ -597,25 +602,86 @@ typedef NSString *CALayerContentsGravity;
 
 -(NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
 {
-  return NSDragOperationNone;
+  NSPoint location = [sender draggingLocation];
+  NSDragOperation ret;
+  GdkMacosDrop *drop;
+
+  if (!(drop = _gdk_macos_drop_new ([self gdkSurface], sender)))
+    return NSDragOperationNone;
+
+  _gdk_macos_display_set_drop ([self gdkDisplay],
+                               [sender draggingSequenceNumber],
+                               GDK_DROP (drop));
+
+  gdk_drop_emit_enter_event (GDK_DROP (drop),
+                             TRUE,
+                             location.x,
+                             GDK_SURFACE (gdk_surface)->height - location.y,
+                             GDK_CURRENT_TIME);
+
+  ret = _gdk_macos_drop_operation (drop);
+
+  g_object_unref (drop);
+
+  return ret;
 }
 
 -(void)draggingEnded:(id <NSDraggingInfo>)sender
 {
+  _gdk_macos_display_set_drop ([self gdkDisplay], [sender draggingSequenceNumber], NULL);
 }
 
 -(void)draggingExited:(id <NSDraggingInfo>)sender
 {
+  NSInteger sequence_number = [sender draggingSequenceNumber];
+  GdkDrop *drop = _gdk_macos_display_find_drop ([self gdkDisplay], sequence_number);
+
+  if (drop != NULL)
+    gdk_drop_emit_leave_event (drop, TRUE, GDK_CURRENT_TIME);
+
+  _gdk_macos_display_set_drop ([self gdkDisplay], sequence_number, NULL);
 }
 
 -(NSDragOperation)draggingUpdated:(id <NSDraggingInfo>)sender
 {
-  return NSDragOperationNone;
+  NSInteger sequence_number = [sender draggingSequenceNumber];
+  GdkDisplay *display = gdk_surface_get_display (GDK_SURFACE (gdk_surface));
+  GdkDrop *drop = _gdk_macos_display_find_drop (GDK_MACOS_DISPLAY (display), sequence_number);
+  NSPoint location = [sender draggingLocation];
+
+  if (drop == NULL)
+    return NSDragOperationNone;
+
+  _gdk_macos_drop_update_actions (GDK_MACOS_DROP (drop), sender);
+
+  gdk_drop_emit_motion_event (drop,
+                              TRUE,
+                              location.x,
+                              GDK_SURFACE (gdk_surface)->height - location.y,
+                              GDK_CURRENT_TIME);
+
+  return _gdk_macos_drop_operation (GDK_MACOS_DROP (drop));
 }
 
 -(BOOL)performDragOperation:(id <NSDraggingInfo>)sender
 {
-  return YES;
+  NSInteger sequence_number = [sender draggingSequenceNumber];
+  GdkDisplay *display = gdk_surface_get_display (GDK_SURFACE (gdk_surface));
+  GdkDrop *drop = _gdk_macos_display_find_drop (GDK_MACOS_DISPLAY (display), sequence_number);
+  NSPoint location = [sender draggingLocation];
+
+  if (drop == NULL)
+    return NO;
+
+  gdk_drop_emit_drop_event (drop,
+                            TRUE,
+                            location.x,
+                            GDK_SURFACE (gdk_surface)->height - location.y,
+                            GDK_CURRENT_TIME);
+
+  gdk_drop_emit_leave_event (drop, TRUE, GDK_CURRENT_TIME);
+
+  return GDK_MACOS_DROP (drop)->finish_action != 0;
 }
 
 -(BOOL)wantsPeriodicDraggingUpdates

gdk/macos/gdkmacosclipboard-private.h

@@ -35,11 +35,24 @@ typedef NSString *NSPasteboardType;
 
 G_DECLARE_FINAL_TYPE (GdkMacosClipboard, _gdk_macos_clipboard, GDK, MACOS_CLIPBOARD, GdkClipboard)
 
-GdkClipboard     *_gdk_macos_clipboard_new                       (GdkMacosDisplay   *display);
-void              _gdk_macos_clipboard_check_externally_modified (GdkMacosClipboard *self);
-NSPasteboardType  _gdk_macos_clipboard_to_ns_type                (const char        *mime_type,
-                                                                  NSPasteboardType  *alternate);
-const char       *_gdk_macos_clipboard_from_ns_type              (NSPasteboardType   ns_type);
+GdkClipboard      *_gdk_macos_clipboard_new                       (GdkMacosDisplay      *display);
+void               _gdk_macos_clipboard_check_externally_modified (GdkMacosClipboard    *self);
+NSPasteboardType   _gdk_macos_clipboard_to_ns_type                (const char           *mime_type,
+                                                                   NSPasteboardType     *alternate);
+const char        *_gdk_macos_clipboard_from_ns_type              (NSPasteboardType      ns_type);
+void               _gdk_macos_clipboard_register_drag_types       (NSWindow             *window);
+GdkContentFormats *_gdk_macos_pasteboard_load_formats             (NSPasteboard         *pasteboard);
+void               _gdk_macos_pasteboard_read_async               (GObject              *object,
+                                                                   NSPasteboard         *pasteboard,
+                                                                   GdkContentFormats    *formats,
+                                                                   int                   io_priority,
+                                                                   GCancellable         *cancellable,
+                                                                   GAsyncReadyCallback   callback,
+                                                                   gpointer              user_data);
+GInputStream      *_gdk_macos_pasteboard_read_finish              (GObject              *object,
+                                                                   GAsyncResult         *result,
+                                                                   const char          **out_mime_type,
+                                                                   GError              **error);
 
 @interface GdkMacosClipboardDataProvider : NSObject <NSPasteboardItemDataProvider>
 {

gdk/macos/gdkmacosclipboard.c

@@ -172,17 +172,15 @@ populate_content_formats (GdkContentFormatsBuilder *builder,
 }
 
 static GdkContentFormats *
-load_offer_formats (GdkMacosClipboard *self)
+load_offer_formats (NSPasteboard *pasteboard)
 {
   GDK_BEGIN_MACOS_ALLOC_POOL;
 
   GdkContentFormatsBuilder *builder;
   GdkContentFormats *formats;
 
-  g_assert (GDK_IS_MACOS_CLIPBOARD (self));
-
   builder = gdk_content_formats_builder_new ();
-  for (NSPasteboardType type in [self->pasteboard types])
+  for (NSPasteboardType type in [pasteboard types])
     populate_content_formats (builder, type);
   formats = gdk_content_formats_builder_free_to_formats (builder);
 
@@ -201,7 +199,7 @@ _gdk_macos_clipboard_load_contents (GdkMacosClipboard *self)
 
   change_count = [self->pasteboard changeCount];
 
-  formats = load_offer_formats (self);
+  formats = load_offer_formats (self->pasteboard);
   gdk_clipboard_claim_remote (GDK_CLIPBOARD (self), formats);
   gdk_content_formats_unref (formats);
 
@@ -225,125 +223,13 @@ _gdk_macos_clipboard_read_async (GdkClipboard        *clipboard,
                                  GAsyncReadyCallback  callback,
                                  gpointer             user_data)
 {
-  GDK_BEGIN_MACOS_ALLOC_POOL;
-
-  GdkMacosClipboard *self = (GdkMacosClipboard *)clipboard;
-  GdkContentFormats *offer_formats = NULL;
-  const char *mime_type;
-  GInputStream *stream = NULL;
-  GTask *task = NULL;
-
-  g_assert (GDK_IS_MACOS_CLIPBOARD (self));
-  g_assert (formats != NULL);
-
-  task = g_task_new (self, cancellable, callback, user_data);
-  g_task_set_source_tag (task, _gdk_macos_clipboard_read_async);
-  g_task_set_priority (task, io_priority);
-
-  offer_formats = load_offer_formats (GDK_MACOS_CLIPBOARD (clipboard));
-  mime_type = gdk_content_formats_match_mime_type (formats, offer_formats);
-
-  if (mime_type == NULL)
-    {
-      g_task_return_new_error (task,
-                               G_IO_ERROR,
-                               G_IO_ERROR_NOT_SUPPORTED,
-                               "%s",
-                               _("No compatible transfer format found"));
-      goto cleanup;
-    }
-
-  if (strcmp (mime_type, "text/plain;charset=utf-8") == 0)
-    {
-      NSString *nsstr = [self->pasteboard stringForType:NSPasteboardTypeString];
-
-      if (nsstr != NULL)
-        {
-          const char *str = [nsstr UTF8String];
-          stream = g_memory_input_stream_new_from_data (g_strdup (str),
-                                                        strlen (str) + 1,
-                                                        g_free);
-        }
-    }
-  else if (strcmp (mime_type, "text/uri-list") == 0)
-    {
-      G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
-
-      if ([[self->pasteboard types] containsObject:PTYPE(FILE_URL)])
-        {
-          GString *str = g_string_new (NULL);
-          NSArray *files = [self->pasteboard propertyListForType:NSFilenamesPboardType];
-          gsize n_files = [files count];
-          char *data;
-          guint len;
-
-          for (gsize i = 0; i < n_files; ++i)
-            {
-              NSString* uriString = [files objectAtIndex:i];
-              uriString = [@"file://" stringByAppendingString:uriString];
-              uriString = [uriString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
-
-              g_string_append_printf (str,
-                                      "%s\r\n",
-                                      [uriString cStringUsingEncoding:NSUTF8StringEncoding]);
-            }
-
-          len = str->len;
-          data = g_string_free (str, FALSE);
-          stream = g_memory_input_stream_new_from_data (data, len, g_free);
-        }
-
-      G_GNUC_END_IGNORE_DEPRECATIONS;
-    }
-  else if (strcmp (mime_type, "application/x-color") == 0)
-    {
-      NSColorSpace *colorspace;
-      NSColor *nscolor;
-      guint16 color[4];
-
-      colorspace = [NSColorSpace genericRGBColorSpace];
-      nscolor = [[NSColor colorFromPasteboard:self->pasteboard]
-                    colorUsingColorSpace:colorspace];
-
-      color[0] = 0xffff * [nscolor redComponent];
-      color[1] = 0xffff * [nscolor greenComponent];
-      color[2] = 0xffff * [nscolor blueComponent];
-      color[3] = 0xffff * [nscolor alphaComponent];
-
-      stream = g_memory_input_stream_new_from_data (g_memdup2 (&color, sizeof color),
-                                                    sizeof color,
-                                                    g_free);
-    }
-  else if (strcmp (mime_type, "image/tiff") == 0)
-    {
-      NSData *data = [self->pasteboard dataForType:PTYPE(TIFF)];
-      stream = create_stream_from_nsdata (data);
-    }
-  else if (strcmp (mime_type, "image/png") == 0)
-    {
-      NSData *data = [self->pasteboard dataForType:PTYPE(PNG)];
-      stream = create_stream_from_nsdata (data);
-    }
-
-  if (stream != NULL)
-    {
-      g_task_set_task_data (task, g_strdup (mime_type), g_free);
-      g_task_return_pointer (task, g_steal_pointer (&stream), g_object_unref);
-    }
-  else
-    {
-      g_task_return_new_error (task,
-                               G_IO_ERROR,
-                               G_IO_ERROR_FAILED,
-                               _("Failed to decode contents with mime-type of '%s'"),
-                               mime_type);
-    }
-
-cleanup:
-  g_clear_object (&task);
-  g_clear_pointer (&offer_formats, gdk_content_formats_unref);
-
-  GDK_END_MACOS_ALLOC_POOL;
+  _gdk_macos_pasteboard_read_async (G_OBJECT (clipboard),
+                                    GDK_MACOS_CLIPBOARD (clipboard)->pasteboard,
+                                    formats,
+                                    io_priority,
+                                    cancellable,
+                                    callback,
+                                    user_data);
 }
 
 static GInputStream *
@@ -352,15 +238,7 @@ _gdk_macos_clipboard_read_finish (GdkClipboard  *clipboard,
                                   const char   **out_mime_type,
                                   GError       **error)
 {
-  GTask *task = (GTask *)result;
-
-  g_assert (GDK_IS_MACOS_CLIPBOARD (clipboard));
-  g_assert (G_IS_TASK (task));
-
-  if (out_mime_type != NULL)
-    *out_mime_type = g_strdup (g_task_get_task_data (task));
-
-  return g_task_propagate_pointer (task, error);
+  return _gdk_macos_pasteboard_read_finish (G_OBJECT (clipboard), result, out_mime_type, error);
 }
 
 static void
@@ -622,4 +500,170 @@ on_data_ready_cb (GObject      *object,
   write_request_free (wr);
 }
 
+void
+_gdk_macos_clipboard_register_drag_types (NSWindow *window)
+{
+  [window registerForDraggedTypes:[NSArray arrayWithObjects:PTYPE(STRING),
+                                                            PTYPE(PBOARD),
+                                                            PTYPE(URL),
+                                                            PTYPE(FILE_URL),
+                                                            PTYPE(COLOR),
+                                                            PTYPE(TIFF),
+                                                            PTYPE(PNG),
+                                                            nil]];
+}
+
 @end
+
+GdkContentFormats *
+_gdk_macos_pasteboard_load_formats (NSPasteboard *pasteboard)
+{
+  return load_offer_formats (pasteboard);
+}
+
+void
+_gdk_macos_pasteboard_read_async (GObject             *object,
+                                  NSPasteboard        *pasteboard,
+                                  GdkContentFormats   *formats,
+                                  int                  io_priority,
+                                  GCancellable        *cancellable,
+                                  GAsyncReadyCallback  callback,
+                                  gpointer             user_data)
+{
+  GDK_BEGIN_MACOS_ALLOC_POOL;
+
+  GdkContentFormats *offer_formats = NULL;
+  const char *mime_type;
+  GInputStream *stream = NULL;
+  GTask *task = NULL;
+
+  g_assert (G_IS_OBJECT (object));
+  g_assert (pasteboard != NULL);
+  g_assert (formats != NULL);
+
+  task = g_task_new (object, cancellable, callback, user_data);
+  g_task_set_source_tag (task, _gdk_macos_pasteboard_read_async);
+  g_task_set_priority (task, io_priority);
+
+  offer_formats = load_offer_formats (pasteboard);
+  mime_type = gdk_content_formats_match_mime_type (formats, offer_formats);
+
+  if (mime_type == NULL)
+    {
+      g_task_return_new_error (task,
+                               G_IO_ERROR,
+                               G_IO_ERROR_NOT_SUPPORTED,
+                               "%s",
+                               _("No compatible transfer format found"));
+      goto cleanup;
+    }
+
+  if (strcmp (mime_type, "text/plain;charset=utf-8") == 0)
+    {
+      NSString *nsstr = [pasteboard stringForType:NSPasteboardTypeString];
+
+      if (nsstr != NULL)
+        {
+          const char *str = [nsstr UTF8String];
+          stream = g_memory_input_stream_new_from_data (g_strdup (str),
+                                                        strlen (str) + 1,
+                                                        g_free);
+        }
+    }
+  else if (strcmp (mime_type, "text/uri-list") == 0)
+    {
+      G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
+
+      if ([[pasteboard types] containsObject:PTYPE(FILE_URL)])
+        {
+          GString *str = g_string_new (NULL);
+          NSArray *files = [pasteboard propertyListForType:NSFilenamesPboardType];
+          gsize n_files = [files count];
+          char *data;
+          guint len;
+
+          for (gsize i = 0; i < n_files; ++i)
+            {
+              NSString* uriString = [files objectAtIndex:i];
+              uriString = [@"file://" stringByAppendingString:uriString];
+              uriString = [uriString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
+
+              g_string_append_printf (str,
+                                      "%s\r\n",
+                                      [uriString cStringUsingEncoding:NSUTF8StringEncoding]);
+            }
+
+          len = str->len;
+          data = g_string_free (str, FALSE);
+          stream = g_memory_input_stream_new_from_data (data, len, g_free);
+        }
+
+      G_GNUC_END_IGNORE_DEPRECATIONS;
+    }
+  else if (strcmp (mime_type, "application/x-color") == 0)
+    {
+      NSColorSpace *colorspace;
+      NSColor *nscolor;
+      guint16 color[4];
+
+      colorspace = [NSColorSpace genericRGBColorSpace];
+      nscolor = [[NSColor colorFromPasteboard:pasteboard]
+                    colorUsingColorSpace:colorspace];
+
+      color[0] = 0xffff * [nscolor redComponent];
+      color[1] = 0xffff * [nscolor greenComponent];
+      color[2] = 0xffff * [nscolor blueComponent];
+      color[3] = 0xffff * [nscolor alphaComponent];
+
+      stream = g_memory_input_stream_new_from_data (g_memdup2 (&color, sizeof color),
+                                                    sizeof color,
+                                                    g_free);
+    }
+  else if (strcmp (mime_type, "image/tiff") == 0)
+    {
+      NSData *data = [pasteboard dataForType:PTYPE(TIFF)];
+      stream = create_stream_from_nsdata (data);
+    }
+  else if (strcmp (mime_type, "image/png") == 0)
+    {
+      NSData *data = [pasteboard dataForType:PTYPE(PNG)];
+      stream = create_stream_from_nsdata (data);
+    }
+
+  if (stream != NULL)
+    {
+      g_task_set_task_data (task, g_strdup (mime_type), g_free);
+      g_task_return_pointer (task, g_steal_pointer (&stream), g_object_unref);
+    }
+  else
+    {
+      g_task_return_new_error (task,
+                               G_IO_ERROR,
+                               G_IO_ERROR_FAILED,
+                               _("Failed to decode contents with mime-type of '%s'"),
+                               mime_type);
+    }
+
+cleanup:
+  g_clear_object (&task);
+  g_clear_pointer (&offer_formats, gdk_content_formats_unref);
+
+  GDK_END_MACOS_ALLOC_POOL;
+}
+
+GInputStream *
+_gdk_macos_pasteboard_read_finish (GObject       *object,
+                                   GAsyncResult  *result,
+                                   const char   **out_mime_type,
+                                   GError       **error)
+{
+  GTask *task = (GTask *)result;
+
+  g_assert (G_IS_OBJECT (object));
+  g_assert (G_IS_TASK (task));
+
+  if (out_mime_type != NULL)
+    *out_mime_type = g_strdup (g_task_get_task_data (task));
+
+  return g_task_propagate_pointer (task, error);
+}

gdk/macos/gdkmacosdisplay-private.h

@@ -81,6 +81,10 @@ struct _GdkMacosDisplay
   /* The surface that is receiving keyboard events */
   GdkMacosSurface *keyboard_surface;
 
+  /* [NSDraggingInfo draggingSequenceNumber] to GdkMacosDr(ag,op) */
+  GHashTable *active_drags;
+  GHashTable *active_drops;
+
   /* Used to translate from quartz coordinate space to GDK */
   int width;
   int height;
@@ -160,6 +164,16 @@ void             _gdk_macos_display_warp_pointer                   (GdkMacosDisp
                                                                     int              x,
                                                                     int              y);
 NSEvent         *_gdk_macos_display_get_nsevent                    (GdkEvent        *event);
+GdkDrag         *_gdk_macos_display_find_drag                      (GdkMacosDisplay *self,
+                                                                    NSInteger        sequence_number);
+GdkDrop         *_gdk_macos_display_find_drop                      (GdkMacosDisplay *self,
+                                                                    NSInteger        sequence_number);
+void             _gdk_macos_display_set_drag                       (GdkMacosDisplay *self,
+                                                                    NSInteger        sequence_number,
+                                                                    GdkDrag         *drag);
+void             _gdk_macos_display_set_drop                       (GdkMacosDisplay *self,
+                                                                    NSInteger        sequence_number,
+                                                                    GdkDrop         *drop);
 
 G_END_DECLS
 

gdk/macos/gdkmacosdisplay-translate.c

@@ -788,6 +788,9 @@ get_surface_from_ns_event (GdkMacosDisplay *self,
       NSRect view_frame;
 
       view = (GdkMacosBaseView *)[nswindow contentView];
+      if (!GDK_IS_MACOS_BASE_VIEW (view))
+        goto find_under_pointer;
+
       surface = GDK_SURFACE ([view gdkSurface]);
 
       point = [nsevent locationInWindow];
@@ -846,6 +849,8 @@ get_surface_from_ns_event (GdkMacosDisplay *self,
         }
     }
 
+find_under_pointer:
+
   if (!surface)
     {
       /* Fallback used when no NSSurface set.  This happens e.g. when
@@ -864,17 +869,24 @@ get_surface_from_ns_event (GdkMacosDisplay *self,
 static GdkMacosSurface *
 find_surface_for_keyboard_event (NSEvent *nsevent)
 {
-  GdkMacosBaseView *view = (GdkMacosBaseView *)[[nsevent window] contentView];
-  GdkSurface *surface = GDK_SURFACE ([view gdkSurface]);
-  GdkDisplay *display = gdk_surface_get_display (surface);
-  GdkSeat *seat = gdk_display_get_default_seat (display);
-  GdkDevice *device = gdk_seat_get_keyboard (seat);
-  GdkDeviceGrabInfo *grab = _gdk_display_get_last_device_grab (display, device);
+  NSView *nsview = [[nsevent window] contentView];
 
-  if (grab && grab->surface && !grab->owner_events)
-    return GDK_MACOS_SURFACE (grab->surface);
+  if (GDK_IS_MACOS_BASE_VIEW (nsview))
+    {
+      GdkMacosBaseView *view = (GdkMacosBaseView *)nsview;
+      GdkSurface *surface = GDK_SURFACE ([view gdkSurface]);
+      GdkDisplay *display = gdk_surface_get_display (surface);
+      GdkSeat *seat = gdk_display_get_default_seat (display);
+      GdkDevice *device = gdk_seat_get_keyboard (seat);
+      GdkDeviceGrabInfo *grab = _gdk_display_get_last_device_grab (display, device);
 
-  return GDK_MACOS_SURFACE (surface);
+      if (grab && grab->surface && !grab->owner_events)
+        return GDK_MACOS_SURFACE (grab->surface);
+
+      return GDK_MACOS_SURFACE (surface);
+    }
+
+  return NULL;
 }
 
 static GdkMacosSurface *
@@ -1090,7 +1102,8 @@ _gdk_macos_display_translate (GdkMacosDisplay *self,
   if (!(surface = find_surface_for_ns_event (self, nsevent, &x, &y)))
     return NULL;
 
-  if (!(window = (GdkMacosWindow *)_gdk_macos_surface_get_native (surface)))
+  if (!(window = (GdkMacosWindow *)_gdk_macos_surface_get_native (surface)) ||
+      !GDK_IS_MACOS_WINDOW (window))
     return NULL;
 
   /* Ignore events and break grabs while the window is being

gdk/macos/gdkmacosdisplay.c

@@ -31,6 +31,8 @@
 #include "gdkmacoscairocontext-private.h"
 #include "gdkmacoseventsource-private.h"
 #include "gdkmacosdisplay-private.h"
+#include "gdkmacosdrag-private.h"
+#include "gdkmacosdrop-private.h"
 #include "gdkmacosglcontext-private.h"
 #include "gdkmacoskeymap-private.h"
 #include "gdkmacosmonitor-private.h"
@@ -635,17 +637,13 @@ gdk_macos_display_load_clipboard (GdkMacosDisplay *self)
   GDK_DISPLAY (self)->clipboard = _gdk_macos_clipboard_new (self);
 }
 
-static gboolean
-gdk_macos_display_make_gl_context_current (GdkDisplay   *display,
-                                           GdkGLContext *gl_context)
+static GdkGLContext *
+gdk_macos_display_init_gl (GdkDisplay  *display,
+                           GError     **error)
 {
-  g_assert (GDK_IS_MACOS_DISPLAY (display));
-  g_assert (!gl_context || GDK_IS_MACOS_GL_CONTEXT (gl_context));
-
-  if (gl_context == NULL)
-    return FALSE;
-
-  return _gdk_macos_gl_context_make_current (GDK_MACOS_GL_CONTEXT (gl_context));
+  return g_object_new (GDK_TYPE_MACOS_GL_CONTEXT,
+                       "display", display,
+                       NULL);
 }
 
 static void
@@ -663,6 +661,8 @@ gdk_macos_display_finalize (GObject *object)
                                       CFSTR ("NSUserDefaultsDidChangeNotification"),
                                       NULL);
 
+  g_clear_pointer (&self->active_drags, g_hash_table_unref);
+  g_clear_pointer (&self->active_drops, g_hash_table_unref);
   g_clear_object (&GDK_DISPLAY (self)->clipboard);
   g_clear_pointer (&self->frame_source, g_source_unref);
   g_clear_object (&self->monitors);
@@ -691,7 +691,7 @@ gdk_macos_display_class_init (GdkMacosDisplayClass *klass)
   display_class->get_name = gdk_macos_display_get_name;
   display_class->get_setting = gdk_macos_display_get_setting;
   display_class->has_pending = gdk_macos_display_has_pending;
-  display_class->make_gl_context_current = gdk_macos_display_make_gl_context_current;
+  display_class->init_gl = gdk_macos_display_init_gl;
   display_class->notify_startup_complete = gdk_macos_display_notify_startup_complete;
   display_class->queue_events = gdk_macos_display_queue_events;
   display_class->sync = gdk_macos_display_sync;
@@ -701,6 +701,8 @@ static void
 gdk_macos_display_init (GdkMacosDisplay *self)
 {
   self->monitors = g_list_store_new (GDK_TYPE_MONITOR);
+  self->active_drags = g_hash_table_new_full (NULL, NULL, NULL, g_object_unref);
+  self->active_drops = g_hash_table_new_full (NULL, NULL, NULL, g_object_unref);
 
   gdk_display_set_composited (GDK_DISPLAY (self), TRUE);
   gdk_display_set_input_shapes (GDK_DISPLAY (self), FALSE);
@@ -1113,3 +1115,55 @@ _gdk_macos_display_get_nsevent (GdkEvent *event)
 
   return NULL;
 }
+
+GdkDrag *
+_gdk_macos_display_find_drag (GdkMacosDisplay *self,
+                              NSInteger        sequence_number)
+{
+  g_return_val_if_fail (GDK_IS_MACOS_DISPLAY (self), NULL);
+
+  return g_hash_table_lookup (self->active_drags, GSIZE_TO_POINTER (sequence_number));
+}
+
+void
+_gdk_macos_display_set_drag (GdkMacosDisplay *self,
+                             NSInteger        sequence_number,
+                             GdkDrag         *drag)
+{
+  g_return_if_fail (GDK_IS_MACOS_DISPLAY (self));
+  g_return_if_fail (!drag || GDK_IS_MACOS_DRAG (drag));
+
+  if (drag)
+    g_hash_table_insert (self->active_drags,
+                         GSIZE_TO_POINTER (sequence_number),
+                         g_object_ref (drag));
+  else
+    g_hash_table_remove (self->active_drags,
+                         GSIZE_TO_POINTER (sequence_number));
+}
+
+GdkDrop *
+_gdk_macos_display_find_drop (GdkMacosDisplay *self,
+                              NSInteger        sequence_number)
+{
+  g_return_val_if_fail (GDK_IS_MACOS_DISPLAY (self), NULL);
+
+  return g_hash_table_lookup (self->active_drops, GSIZE_TO_POINTER (sequence_number));
+}
+
+void
+_gdk_macos_display_set_drop (GdkMacosDisplay *self,
+                             NSInteger        sequence_number,
+                             GdkDrop         *drop)
+{
+  g_return_if_fail (GDK_IS_MACOS_DISPLAY (self));
+  g_return_if_fail (!drop || GDK_IS_MACOS_DROP (drop));
+
+  if (drop)
+    g_hash_table_insert (self->active_drops,
+                         GSIZE_TO_POINTER (sequence_number),
+                         g_object_ref (drop));
+  else
+    g_hash_table_remove (self->active_drops,
+                         GSIZE_TO_POINTER (sequence_number));
+}

gdk/macos/gdkmacosdrag.c

@@ -326,12 +326,10 @@ gdk_drag_update (GdkDrag         *drag,
                                 &suggested_action,
                                 &possible_actions);
 
-  _gdk_macos_drag_surface_drag_motion (self->drag_surface,
-                                       x_root - self->hot_x,
-                                       y_root - self->hot_y,
-                                       suggested_action,
-                                       possible_actions,
-                                       evtime);
+  if (GDK_IS_MACOS_SURFACE (self->drag_surface))
+    _gdk_macos_surface_move (GDK_MACOS_SURFACE (self->drag_surface),
+                             x_root - self->hot_x,
+                             y_root - self->hot_y);
 
   if (!self->did_update)
     {
@@ -339,6 +337,8 @@ gdk_drag_update (GdkDrag         *drag,
       self->start_y = self->last_y;
       self->did_update = TRUE;
     }
+
+  gdk_drag_set_actions (drag, possible_actions);
 }
 
 static gboolean

gdk/macos/gdkmacosdragsurface-private.h

@@ -31,19 +31,13 @@ typedef struct _GdkMacosDragSurfaceClass GdkMacosDragSurfaceClass;
 #define GDK_MACOS_DRAG_SURFACE(object)    (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_MACOS_DRAG_SURFACE, GdkMacosDragSurface))
 #define GDK_IS_MACOS_DRAG_SURFACE(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_MACOS_DRAG_SURFACE))
 
-GType            _gdk_macos_drag_surface_get_type    (void);
-GdkMacosSurface *_gdk_macos_drag_surface_new         (GdkMacosDisplay *display,
-                                                      GdkFrameClock   *frame_clock,
-                                                      int              x,
-                                                      int              y,
-                                                      int              width,
-                                                      int              height);
-void             _gdk_macos_drag_surface_drag_motion (GdkMacosDragSurface *self,
-                                                      int                  x_root,
-                                                      int                  y_root,
-                                                      GdkDragAction        suggested_action,
-                                                      GdkDragAction        possible_actions,
-                                                      guint32              evtime);
+GType            _gdk_macos_drag_surface_get_type (void);
+GdkMacosSurface *_gdk_macos_drag_surface_new      (GdkMacosDisplay *display,
+                                                   GdkFrameClock   *frame_clock,
+                                                   int              x,
+                                                   int              y,
+                                                   int              width,
+                                                   int              height);
 
 G_END_DECLS
 

gdk/macos/gdkmacosdragsurface.c

@@ -123,16 +123,3 @@ _gdk_macos_drag_surface_new (GdkMacosDisplay *display,
 
   return g_steal_pointer (&self);
 }
-
-void
-_gdk_macos_drag_surface_drag_motion (GdkMacosDragSurface *self,
-                                     int                  x_root,
-                                     int                  y_root,
-                                     GdkDragAction        suggested_action,
-                                     GdkDragAction        possible_actions,
-                                     guint32              evtime)
-{
-  g_return_if_fail (GDK_IS_MACOS_DRAG_SURFACE (self));
-
-  _gdk_macos_surface_move (GDK_MACOS_SURFACE (self), x_root, y_root);
-}

gdk/macos/gdkmacosdrop-private.h

@@ -0,0 +1,66 @@
+/*
+ * Copyright © 2021 Red Hat, Inc.
+ *
+ * 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 2.1 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/>.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#ifndef __GDK_MACOS_DROP_PRIVATE_H__
+#define __GDK_MACOS_DROP_PRIVATE_H__
+
+#include <AppKit/AppKit.h>
+
+#include "gdkdropprivate.h"
+
+#include "gdkmacossurface-private.h"
+
+G_BEGIN_DECLS
+
+#define GDK_TYPE_MACOS_DROP            (gdk_macos_drop_get_type ())
+#define GDK_MACOS_DROP(object)         (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_MACOS_DROP, GdkMacosDrop))
+#define GDK_MACOS_DROP_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_MACOS_DROP, GdkMacosDropClass))
+#define GDK_IS_MACOS_DROP(object)      (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_MACOS_DROP))
+#define GDK_IS_MACOS_DROP_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_MACOS_DROP))
+#define GDK_MACOS_DROP_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_MACOS_DROP, GdkMacosDropClass))
+
+typedef struct _GdkMacosDrop GdkMacosDrop;
+typedef struct _GdkMacosDropClass GdkMacosDropClass;
+
+struct _GdkMacosDrop
+{
+  GdkDrop parent_instance;
+
+  NSPasteboard *pasteboard;
+
+  GdkDragAction all_actions;
+  GdkDragAction preferred_action;
+  GdkDragAction finish_action;
+};
+
+struct _GdkMacosDropClass
+{
+  GdkDropClass parent_class;
+};
+
+GType             gdk_macos_drop_get_type       (void) G_GNUC_CONST;
+GdkMacosDrop    *_gdk_macos_drop_new            (GdkMacosSurface    *surface,
+                                                 id<NSDraggingInfo>  info);
+NSDragOperation  _gdk_macos_drop_operation      (GdkMacosDrop       *self);
+void             _gdk_macos_drop_update_actions (GdkMacosDrop       *self,
+                                                 id<NSDraggingInfo>  info);
+
+G_END_DECLS
+
+#endif /* __GDK_MACOS_DROP_PRIVATE_H__ */

gdk/macos/gdkmacosdrop.c

@@ -0,0 +1,183 @@
+/*
+ * Copyright © 2021 Red Hat, Inc.
+ *
+ * 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 2.1 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/>.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#include "config.h"
+
+#include "gdkmacosclipboard-private.h"
+#include "gdkmacosdisplay-private.h"
+#include "gdkmacosdrag-private.h"
+#include "gdkmacosdrop-private.h"
+
+G_DEFINE_TYPE (GdkMacosDrop, gdk_macos_drop, GDK_TYPE_DROP)
+
+static void
+gdk_macos_drop_status (GdkDrop       *drop,
+                       GdkDragAction  actions,
+                       GdkDragAction  preferred)
+{
+  GdkMacosDrop *self = (GdkMacosDrop *)drop;
+
+  g_assert (GDK_IS_MACOS_DROP (self));
+
+  self->all_actions = actions;
+  self->preferred_action = preferred;
+}
+
+static void
+gdk_macos_drop_read_async (GdkDrop             *drop,
+                           GdkContentFormats   *content_formats,
+                           int                  io_priority,
+                           GCancellable        *cancellable,
+                           GAsyncReadyCallback  callback,
+                           gpointer             user_data)
+{
+  _gdk_macos_pasteboard_read_async (G_OBJECT (drop),
+                                    GDK_MACOS_DROP (drop)->pasteboard,
+                                    content_formats,
+                                    io_priority,
+                                    cancellable,
+                                    callback,
+                                    user_data);
+}
+
+static GInputStream *
+gdk_macos_drop_read_finish (GdkDrop       *drop,
+                            GAsyncResult  *result,
+                            const char   **out_mime_type,
+                            GError       **error)
+{
+  return _gdk_macos_pasteboard_read_finish (G_OBJECT (drop), result, out_mime_type, error);
+}
+
+static void
+gdk_macos_drop_finish (GdkDrop       *drop,
+                       GdkDragAction  action)
+{
+  g_assert (GDK_IS_MACOS_DROP (drop));
+
+  GDK_MACOS_DROP (drop)->finish_action = action;
+}
+
+static void
+gdk_macos_drop_finalize (GObject *object)
+{
+  GdkMacosDrop *self = (GdkMacosDrop *)object;
+
+  if (self->pasteboard)
+    {
+      [self->pasteboard release];
+      self->pasteboard = NULL;
+    }
+
+  G_OBJECT_CLASS (gdk_macos_drop_parent_class)->finalize (object);
+}
+
+static void
+gdk_macos_drop_class_init (GdkMacosDropClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GdkDropClass *drop_class = GDK_DROP_CLASS (klass);
+
+  object_class->finalize = gdk_macos_drop_finalize;
+
+  drop_class->status = gdk_macos_drop_status;
+  drop_class->read_async = gdk_macos_drop_read_async;
+  drop_class->read_finish = gdk_macos_drop_read_finish;
+  drop_class->finish = gdk_macos_drop_finish;
+}
+
+static void
+gdk_macos_drop_init (GdkMacosDrop *self)
+{
+}
+
+void
+_gdk_macos_drop_update_actions (GdkMacosDrop       *self,
+                                id<NSDraggingInfo>  info)
+{
+  NSDragOperation op;
+  GdkDragAction actions = 0;
+
+  g_assert (GDK_IS_MACOS_DROP (self));
+
+  op = [info draggingSourceOperationMask];
+
+  if (op & NSDragOperationCopy)
+    actions |= GDK_ACTION_COPY;
+
+  if (op & NSDragOperationLink)
+    actions |= GDK_ACTION_LINK;
+
+  if (op & NSDragOperationMove)
+    actions |= GDK_ACTION_MOVE;
+
+  gdk_drop_set_actions (GDK_DROP (self), actions);
+}
+
+GdkMacosDrop *
+_gdk_macos_drop_new (GdkMacosSurface    *surface,
+                     id<NSDraggingInfo>  info)
+{
+  GdkDrag *drag = NULL;
+  GdkContentFormats *content_formats;
+  GdkMacosDrop *self;
+  GdkDisplay *display;
+  GdkDevice *device;
+  GdkSeat *seat;
+
+  g_return_val_if_fail (GDK_IS_MACOS_SURFACE (surface), NULL);
+  g_return_val_if_fail (info != NULL, NULL);
+
+  display = gdk_surface_get_display (GDK_SURFACE (surface));
+  seat = gdk_display_get_default_seat (display);
+  device = gdk_seat_get_pointer (seat);
+  drag = _gdk_macos_display_find_drag (GDK_MACOS_DISPLAY (display), [info draggingSequenceNumber]);
+
+  content_formats = _gdk_macos_pasteboard_load_formats ([info draggingPasteboard]);
+
+  self = g_object_new (GDK_TYPE_MACOS_DROP,
+                       "device", device,
+                       "drag", drag,
+                       "formats", content_formats,
+                       "surface", surface,
+                       NULL);
+
+  self->pasteboard = [[info draggingPasteboard] retain];
+
+  _gdk_macos_drop_update_actions (self, info);
+
+  gdk_content_formats_unref (content_formats);
+
+  return g_steal_pointer (&self);
+}
+
+NSDragOperation
+_gdk_macos_drop_operation (GdkMacosDrop *self)
+{
+  if (self->preferred_action & GDK_ACTION_LINK)
+    return NSDragOperationLink;
+
+  if (self->preferred_action & GDK_ACTION_MOVE)
+    return NSDragOperationMove;
+
+  if (self->preferred_action & GDK_ACTION_COPY)
+    return NSDragOperationCopy;
+  
+  return NSDragOperationNone;
+}

gdk/macos/gdkmacosglcontext-private.h

@@ -19,12 +19,14 @@
 #ifndef __GDK_MACOS_GL_CONTEXT_PRIVATE_H__
 #define __GDK_MACOS_GL_CONTEXT_PRIVATE_H__
 
+#include "gdkmacosglcontext.h"
+
 #include "gdkglcontextprivate.h"
 #include "gdkdisplayprivate.h"
 #include "gdksurface.h"
 #include "gdkinternals.h"
 
-#include "gdkmacosglcontext.h"
+#include "gdkmacosdisplay.h"
 #include "gdkmacossurface.h"
 
 #import <OpenGL/OpenGL.h>
@@ -55,11 +57,6 @@ struct _GdkMacosGLContextClass
   GdkGLContextClass parent_class;
 };
 
-GdkGLContext *_gdk_macos_gl_context_new          (GdkMacosSurface    *surface,
-                                                  gboolean            attached,
-                                                  GdkGLContext       *share,
-                                                  GError            **error);
-gboolean      _gdk_macos_gl_context_make_current (GdkMacosGLContext  *self);
 
 G_END_DECLS
 

gdk/macos/gdkmacosglcontext.c

@@ -145,6 +145,7 @@ ensure_gl_view (GdkMacosGLContext *self)
       [nsview setPostsFrameChangedNotifications: YES];
       [nsview setNeedsDisplay:YES];
       [nswindow setContentView:nsview];
+      [nswindow makeFirstResponder:nsview];
       [nsview release];
 
       if (self->dummy_view != NULL)
@@ -169,12 +170,12 @@ gdk_macos_gl_context_real_realize (GdkGLContext  *context,
 {
   GdkMacosGLContext *self = (GdkMacosGLContext *)context;
   GdkSurface *surface;
+  GdkDisplay *display;
   NSOpenGLContext *shared_gl_context = nil;
   NSOpenGLContext *gl_context;
   NSOpenGLPixelFormat *pixelFormat;
   CGLContextObj cgl_context;
   GdkGLContext *shared;
-  GdkGLContext *shared_data;
   NSOpenGLContext *existing;
   GLint sync_to_framerate = 1;
   GLint validate = 0;
@@ -191,21 +192,16 @@ gdk_macos_gl_context_real_realize (GdkGLContext  *context,
   gdk_gl_context_get_required_version (context, &major, &minor);
 
   surface = gdk_draw_context_get_surface (GDK_DRAW_CONTEXT (context));
-  shared = gdk_gl_context_get_shared_context (context);
-  shared_data = gdk_surface_get_shared_data_gl_context (surface);
+  display = gdk_gl_context_get_display (context);
+  shared = gdk_display_get_gl_context (display);
 
   if (shared != NULL)
     {
       if (!(shared_gl_context = get_ns_open_gl_context (GDK_MACOS_GL_CONTEXT (shared), error)))
         return FALSE;
     }
-  else if (shared_data != NULL)
-    {
-      if (!(shared_gl_context = get_ns_open_gl_context (GDK_MACOS_GL_CONTEXT (shared_data), error)))
-        return FALSE;
-    }
 
-  GDK_DISPLAY_NOTE (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context)),
+  GDK_DISPLAY_NOTE (display,
                     OPENGL,
                     g_message ("Creating NSOpenGLContext (version %d.%d)",
                                major, minor));
@@ -252,7 +248,7 @@ gdk_macos_gl_context_real_realize (GdkGLContext  *context,
 
   GLint renderer_id = 0;
   [gl_context getValues:&renderer_id forParameter:NSOpenGLContextParameterCurrentRendererID];
-  GDK_DISPLAY_NOTE (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context)),
+  GDK_DISPLAY_NOTE (display,
                     OPENGL,
                     g_message ("Created NSOpenGLContext[%p] using %s",
                                gl_context,
@@ -314,9 +310,7 @@ gdk_macos_gl_context_begin_frame (GdkDrawContext *context,
    * want to replace our damage region for the next frame (to avoid
    * doing it multiple times).
    */
-  if (!self->is_attached &&
-      gdk_gl_context_get_shared_context (GDK_GL_CONTEXT (context)))
-    ensure_gl_view (self);
+  ensure_gl_view (self);
 
   if (self->needs_resize)
     {
@@ -409,6 +403,57 @@ gdk_macos_gl_context_surface_resized (GdkDrawContext *draw_context)
   g_clear_pointer (&self->damage, cairo_region_destroy);
 }
 
+static gboolean
+gdk_macos_gl_context_clear_current (GdkGLContext *context)
+{
+  GdkMacosGLContext *self = GDK_MACOS_GL_CONTEXT (context);
+  NSOpenGLContext *current;
+
+  g_return_val_if_fail (GDK_IS_MACOS_GL_CONTEXT (self), FALSE);
+
+  current = [NSOpenGLContext currentContext];
+
+  if (self->gl_context == current)
+    {
+      /* The OpenGL mac programming guide suggests that glFlush() is called
+       * before switching current contexts to ensure that the drawing commands
+       * are submitted.
+       */
+      if (current != NULL)
+        glFlush ();
+
+      [NSOpenGLContext clearCurrentContext];
+    }
+
+  return TRUE;
+}
+
+static gboolean
+gdk_macos_gl_context_make_current (GdkGLContext *context,
+                                   gboolean      surfaceless)
+{
+  GdkMacosGLContext *self = GDK_MACOS_GL_CONTEXT (context);
+  NSOpenGLContext *current;
+
+  g_return_val_if_fail (GDK_IS_MACOS_GL_CONTEXT (self), FALSE);
+
+  current = [NSOpenGLContext currentContext];
+
+  if (self->gl_context != current)
+    {
+      /* The OpenGL mac programming guide suggests that glFlush() is called
+       * before switching current contexts to ensure that the drawing commands
+       * are submitted.
+       */
+      if (current != NULL)
+        glFlush ();
+
+      [self->gl_context makeCurrentContext];
+    }
+
+  return TRUE;
+}
+
 static cairo_region_t *
 gdk_macos_gl_context_get_damage (GdkGLContext *context)
 {
@@ -477,52 +522,4 @@ gdk_macos_gl_context_init (GdkMacosGLContext *self)
 {
 }
 
-GdkGLContext *
-_gdk_macos_gl_context_new (GdkMacosSurface  *surface,
-                           gboolean          attached,
-                           GdkGLContext     *share,
-                           GError          **error)
-{
-  GdkMacosGLContext *context;
-
-  g_return_val_if_fail (GDK_IS_MACOS_SURFACE (surface), NULL);
-  g_return_val_if_fail (!share || GDK_IS_MACOS_GL_CONTEXT (share), NULL);
-
-  context = g_object_new (GDK_TYPE_MACOS_GL_CONTEXT,
-                          "surface", surface,
-                          "shared-context", share,
-                          NULL);
-
-  context->is_attached = !!attached;
-
-  return GDK_GL_CONTEXT (context);
-}
-
-gboolean
-_gdk_macos_gl_context_make_current (GdkMacosGLContext *self)
-{
-  NSOpenGLContext *current;
-
-  g_return_val_if_fail (GDK_IS_MACOS_GL_CONTEXT (self), FALSE);
-
-  if (self->gl_context == NULL)
-    return FALSE;
-
-  current = [NSOpenGLContext currentContext];
-
-  if (self->gl_context != current)
-    {
-      /* The OpenGL mac programming guide suggests that glFlush() is called
-       * before switching current contexts to ensure that the drawing commands
-       * are submitted.
-       */
-      if (current != NULL)
-        glFlush ();
-
-      [self->gl_context makeCurrentContext];
-    }
-
-  return TRUE;
-}
-
 G_GNUC_END_IGNORE_DEPRECATIONS

gdk/macos/gdkmacosseat.c

@@ -348,7 +348,7 @@ _gdk_macos_seat_new (GdkMacosDisplay *display)
 
   init_devices (self);
 
-  return g_steal_pointer (&self);
+  return GDK_SEAT (g_steal_pointer (&self));
 }
 
 static GdkDeviceToolType

gdk/macos/gdkmacossurface.c

@@ -332,7 +332,7 @@ gdk_macos_surface_drag_begin (GdkSurface         *surface,
   drag_surface = _gdk_macos_surface_new (GDK_MACOS_DISPLAY (surface->display),
                                          GDK_SURFACE_TEMP,
                                          surface,
-                                         -99, -99, 1, 1);
+                                         sx, sy, 1, 1);
   drag = g_object_new (GDK_TYPE_MACOS_DRAG,
                        "drag-surface", drag_surface,
                        "surface", surface,
@@ -358,20 +358,6 @@ gdk_macos_surface_drag_begin (GdkSurface         *surface,
   return GDK_DRAG (g_steal_pointer (&drag));
 }
 
-static GdkGLContext *
-gdk_macos_surface_create_gl_context (GdkSurface    *surface,
-                                     gboolean       attached,
-                                     GdkGLContext  *share,
-                                     GError       **error)
-{
-  GdkMacosSurface *self = (GdkMacosSurface *)surface;
-
-  g_assert (GDK_IS_MACOS_SURFACE (self));
-  g_assert (!share || GDK_IS_GL_CONTEXT (share));
-
-  return _gdk_macos_gl_context_new (self, attached, share, error);
-}
-
 static void
 gdk_macos_surface_destroy (GdkSurface *surface,
                            gboolean    foreign_destroy)
@@ -495,7 +481,6 @@ gdk_macos_surface_class_init (GdkMacosSurfaceClass *klass)
   object_class->get_property = gdk_macos_surface_get_property;
   object_class->set_property = gdk_macos_surface_set_property;
 
-  surface_class->create_gl_context = gdk_macos_surface_create_gl_context;
   surface_class->destroy = gdk_macos_surface_destroy;
   surface_class->drag_begin = gdk_macos_surface_drag_begin;
   surface_class->get_device_state = gdk_macos_surface_get_device_state;

gdk/macos/meson.build

@@ -10,6 +10,7 @@ gdk_macos_sources = files([
   'gdkmacosdisplay-settings.c',
   'gdkmacosdisplay-translate.c',
   'gdkmacosdrag.c',
+  'gdkmacosdrop.c',
   'gdkmacosdragsurface.c',
   'gdkmacosglcontext.c',
   'gdkmacoseventsource.c',

gdk/wayland/gdkdevice-wayland.c

@@ -1550,6 +1550,7 @@ pointer_handle_leave (void              *data,
   GdkWaylandSeat *seat = data;
   GdkEvent *event;
   GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (seat->display);
+  GdkDeviceGrabInfo *grab;
 
   if (!surface)
     return;
@@ -1561,8 +1562,11 @@ pointer_handle_leave (void              *data,
     return;
 
   _gdk_wayland_display_update_serial (display_wayland, serial);
+  grab = _gdk_display_get_last_device_grab (seat->display,
+                                            seat->logical_pointer);
 
-  if (seat->pointer_info.button_modifiers != 0)
+  if (seat->pointer_info.button_modifiers != 0 &&
+      grab && grab->implicit)
     {
       gulong display_serial;
 
@@ -3089,6 +3093,11 @@ seat_handle_capabilities (void                    *data,
     }
   else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && seat->wl_pointer)
     {
+      g_clear_pointer (&seat->wp_pointer_gesture_swipe,
+                       zwp_pointer_gesture_swipe_v1_destroy);
+      g_clear_pointer (&seat->wp_pointer_gesture_pinch,
+                       zwp_pointer_gesture_pinch_v1_destroy);
+
       wl_pointer_release (seat->wl_pointer);
       seat->wl_pointer = NULL;
       gdk_seat_device_removed (GDK_SEAT (seat), seat->pointer);

gdk/wayland/gdkdisplay-wayland.c

@@ -432,12 +432,12 @@ gdk_registry_handle_global (void               *data,
       display_wayland->subcompositor =
         wl_registry_bind (display_wayland->wl_registry, id, &wl_subcompositor_interface, 1);
     }
-  else if (strcmp (interface, "zwp_pointer_gestures_v1") == 0 &&
-           version == GDK_ZWP_POINTER_GESTURES_V1_VERSION)
+  else if (strcmp (interface, "zwp_pointer_gestures_v1") == 0)
     {
       display_wayland->pointer_gestures =
         wl_registry_bind (display_wayland->wl_registry,
-                          id, &zwp_pointer_gestures_v1_interface, version);
+                          id, &zwp_pointer_gestures_v1_interface,
+                          MIN (version, GDK_ZWP_POINTER_GESTURES_V1_VERSION));
     }
   else if (strcmp (interface, "zwp_primary_selection_device_manager_v1") == 0)
     {
@@ -969,7 +969,7 @@ gdk_wayland_display_class_init (GdkWaylandDisplayClass *class)
   display_class->create_surface = _gdk_wayland_display_create_surface;
   display_class->get_keymap = _gdk_wayland_display_get_keymap;
 
-  display_class->make_gl_context_current = gdk_wayland_display_make_gl_context_current;
+  display_class->init_gl = gdk_wayland_display_init_gl;
 
   display_class->get_monitors = gdk_wayland_display_get_monitors;
   display_class->get_monitor_at_surface = gdk_wayland_display_get_monitor_at_surface;
@@ -991,6 +991,26 @@ gdk_wayland_display_get_toplevel_surfaces (GdkDisplay *display)
   return GDK_WAYLAND_DISPLAY (display)->toplevels;
 }
 
+static struct wl_cursor_theme *
+try_load_theme (GdkWaylandDisplay *display_wayland,
+                const char        *dir,
+                gboolean           dotdir,
+                const char        *name,
+                int                size)
+{
+  struct wl_cursor_theme *theme = NULL;
+  char *path;
+
+  path = g_build_filename (dir, dotdir ? ".icons" : "icons", name, "cursors", NULL);
+
+  if (g_file_test (path, G_FILE_TEST_IS_DIR))
+    theme = wl_cursor_theme_create (path, size, display_wayland->shm);
+
+  g_free (path);
+
+  return theme;
+}
+
 static struct wl_cursor_theme *
 get_cursor_theme (GdkWaylandDisplay *display_wayland,
                   const char *name,
@@ -1000,16 +1020,18 @@ get_cursor_theme (GdkWaylandDisplay *display_wayland,
   struct wl_cursor_theme *theme = NULL;
   int i;
 
+  theme = try_load_theme (display_wayland, g_get_user_data_dir (), FALSE, name, size);
+  if (theme)
+    return theme;
+
+  theme = try_load_theme (display_wayland, g_get_home_dir (), TRUE, name, size);
+  if (theme)
+    return theme;
+
   xdg_data_dirs = g_get_system_data_dirs ();
   for (i = 0; xdg_data_dirs[i]; i++)
     {
-      char *path = g_build_filename (xdg_data_dirs[i], "icons", name, "cursors", NULL);
-
-      if (g_file_test (path, G_FILE_TEST_IS_DIR))
-        theme = wl_cursor_theme_create (path, size, display_wayland->shm);
-
-      g_free (path);
-
+      theme = try_load_theme (display_wayland, xdg_data_dirs[i], FALSE, name, size);
       if (theme)
         return theme;
     }
@@ -1648,6 +1670,7 @@ static TranslationEntry translations[] = {
   { FALSE, "org.gnome.desktop.wm.preferences", "action-middle-click-titlebar", "gtk-titlebar-middle-click", G_TYPE_STRING, { .s = "none" } },
   { FALSE, "org.gnome.desktop.wm.preferences", "action-right-click-titlebar", "gtk-titlebar-right-click", G_TYPE_STRING, { .s = "menu" } },
   { FALSE, "org.gnome.desktop.a11y", "always-show-text-caret", "gtk-keynav-use-caret", G_TYPE_BOOLEAN, { .b = FALSE } },
+  /* Note, this setting doesn't exist, the portal and gsd fake it */
   { FALSE, "org.gnome.fontconfig", "serial", "gtk-fontconfig-timestamp", G_TYPE_NONE, { .i = 0 } },
 };
 

gdk/wayland/gdkdisplay-wayland.h

@@ -153,14 +153,12 @@ struct _GdkWaylandDisplay
 
   /* egl info */
   EGLDisplay egl_display;
+  EGLConfig egl_config;
   int egl_major_version;
   int egl_minor_version;
 
-  guint have_egl : 1;
-  guint have_egl_khr_create_context : 1;
   guint have_egl_buffer_age : 1;
   guint have_egl_swap_buffers_with_damage : 1;
-  guint have_egl_surfaceless_context : 1;
 };
 
 struct _GdkWaylandDisplayClass

gdk/wayland/gdkdrag-wayland.c

@@ -163,6 +163,7 @@ gdk_wayland_drag_cancel (GdkDrag             *drag,
                          GdkDragCancelReason  reason)
 {
   gdk_drag_set_cursor (drag, NULL);
+  gdk_drag_drop_done (drag, FALSE);
 }
 
 static void
@@ -290,6 +291,7 @@ data_source_dnd_finished (void                  *data,
   GdkDrag *drag = data;
 
   g_signal_emit_by_name (drag, "dnd-finished");
+  gdk_drag_drop_done (drag, TRUE);
 }
 
 static void

gdk/wayland/gdkglcontext-wayland.c

@@ -22,7 +22,9 @@
 #include "config.h"
 
 #include "gdkglcontext-wayland.h"
+
 #include "gdkdisplay-wayland.h"
+#include "gdksurface-wayland.h"
 
 #include "gdkwaylanddisplay.h"
 #include "gdkwaylandglcontext.h"
@@ -53,14 +55,14 @@ gdk_wayland_gl_context_realize (GdkGLContext *context,
 {
   GdkWaylandGLContext *context_wayland = GDK_WAYLAND_GL_CONTEXT (context);
   GdkDisplay *display = gdk_gl_context_get_display (context);
-  GdkGLContext *share = gdk_gl_context_get_shared_context (context);
-  GdkGLContext *shared_data_context = gdk_surface_get_shared_data_gl_context (gdk_gl_context_get_surface (context));
+  GdkGLContext *share = gdk_display_get_gl_context (display);
   GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
   EGLContext ctx;
   EGLint context_attribs[N_EGL_ATTRS];
   int major, minor, flags;
   gboolean debug_bit, forward_bit, legacy_bit, use_es;
   int i = 0;
+  G_GNUC_UNUSED gint64 start_time = GDK_PROFILER_CURRENT_TIME;
 
   gdk_gl_context_get_required_version (context, &major, &minor);
   debug_bit = gdk_gl_context_get_debug_enabled (context);
@@ -120,10 +122,9 @@ gdk_wayland_gl_context_realize (GdkGLContext *context,
                                use_es ? "yes" : "no"));
 
   ctx = eglCreateContext (display_wayland->egl_display,
-                          context_wayland->egl_config,
+                          display_wayland->egl_config,
                           share != NULL ? GDK_WAYLAND_GL_CONTEXT (share)->egl_context
-                             : shared_data_context != NULL ? GDK_WAYLAND_GL_CONTEXT (shared_data_context)->egl_context
-                                                  : EGL_NO_CONTEXT,
+                                        : EGL_NO_CONTEXT,
                           context_attribs);
 
   /* If context creation failed without the ES bit, let's try again with it */
@@ -147,10 +148,9 @@ gdk_wayland_gl_context_realize (GdkGLContext *context,
       GDK_DISPLAY_NOTE (display, OPENGL,
                 g_message ("eglCreateContext failed, switching to OpenGL ES"));
       ctx = eglCreateContext (display_wayland->egl_display,
-                              context_wayland->egl_config,
+                              display_wayland->egl_config,
                               share != NULL ? GDK_WAYLAND_GL_CONTEXT (share)->egl_context
-                                 : shared_data_context != NULL ? GDK_WAYLAND_GL_CONTEXT (shared_data_context)->egl_context
-                                    : EGL_NO_CONTEXT,
+                                            : EGL_NO_CONTEXT,
                               context_attribs);
     }
 
@@ -177,10 +177,9 @@ gdk_wayland_gl_context_realize (GdkGLContext *context,
       GDK_DISPLAY_NOTE (display, OPENGL,
                 g_message ("eglCreateContext failed, switching to legacy"));
       ctx = eglCreateContext (display_wayland->egl_display,
-                              context_wayland->egl_config,
+                              display_wayland->egl_config,
                               share != NULL ? GDK_WAYLAND_GL_CONTEXT (share)->egl_context
-                                 : shared_data_context != NULL ? GDK_WAYLAND_GL_CONTEXT (shared_data_context)->egl_context
-                                    : EGL_NO_CONTEXT,
+                                            : EGL_NO_CONTEXT,
                               context_attribs);
     }
 
@@ -199,6 +198,8 @@ gdk_wayland_gl_context_realize (GdkGLContext *context,
   gdk_gl_context_set_is_legacy (context, legacy_bit);
   gdk_gl_context_set_use_es (context, use_es);
 
+  gdk_profiler_end_mark (start_time, "realize GdkWaylandGLContext", NULL);
+
   return TRUE;
 }
 
@@ -213,17 +214,8 @@ gdk_wayland_gl_context_get_damage (GdkGLContext *context)
 
   if (display_wayland->have_egl_buffer_age)
     {
-      GdkGLContext *shared;
-      GdkWaylandGLContext *shared_wayland;
-
-      shared = gdk_gl_context_get_shared_context (context);
-      if (shared == NULL)
-        shared = context;
-      shared_wayland = GDK_WAYLAND_GL_CONTEXT (shared);
-
-      egl_surface = gdk_wayland_surface_get_egl_surface (surface,
-                                                        shared_wayland->egl_config);
-      gdk_gl_context_make_current (shared);
+      egl_surface = gdk_wayland_surface_get_egl_surface (surface);
+      gdk_gl_context_make_current (context);
       eglQuerySurface (display_wayland->egl_display, egl_surface,
                        EGL_BUFFER_AGE_EXT, &buffer_age);
 
@@ -256,6 +248,47 @@ gdk_wayland_gl_context_get_damage (GdkGLContext *context)
   return GDK_GL_CONTEXT_CLASS (gdk_wayland_gl_context_parent_class)->get_damage (context);
 }
 
+static gboolean
+gdk_wayland_gl_context_clear_current (GdkGLContext *context)
+{
+  GdkDisplay *display = gdk_gl_context_get_display (context);
+  GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
+
+  return eglMakeCurrent (display_wayland->egl_display,
+                         EGL_NO_SURFACE,
+                         EGL_NO_SURFACE,
+                         EGL_NO_CONTEXT);
+}
+
+static gboolean
+gdk_wayland_gl_context_make_current (GdkGLContext *context,
+                                     gboolean      surfaceless)
+{
+  GdkWaylandGLContext *context_wayland = GDK_WAYLAND_GL_CONTEXT (context);
+  GdkDisplay *display = gdk_gl_context_get_display (context);
+  GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
+  EGLSurface egl_surface;
+
+  if (!surfaceless)
+    egl_surface = gdk_wayland_surface_get_egl_surface (gdk_gl_context_get_surface (context));
+  else
+    egl_surface = EGL_NO_SURFACE;
+
+  return eglMakeCurrent (display_wayland->egl_display,
+                         egl_surface,
+                         egl_surface,
+                         context_wayland->egl_context);
+}
+
+static void
+gdk_wayland_gl_context_begin_frame (GdkDrawContext *draw_context,
+                                    cairo_region_t *region)
+{
+  GDK_DRAW_CONTEXT_CLASS (gdk_wayland_gl_context_parent_class)->begin_frame (draw_context, region);
+
+  glDrawBuffers (1, (GLenum[1]) { GL_BACK });
+}
+
 static void
 gdk_wayland_gl_context_end_frame (GdkDrawContext *draw_context,
                                   cairo_region_t *painted)
@@ -264,18 +297,13 @@ gdk_wayland_gl_context_end_frame (GdkDrawContext *draw_context,
   GdkSurface *surface = gdk_gl_context_get_surface (context);
   GdkDisplay *display = gdk_surface_get_display (surface);
   GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
-  GdkWaylandGLContext *context_wayland = GDK_WAYLAND_GL_CONTEXT (context);
   EGLSurface egl_surface;
 
   GDK_DRAW_CONTEXT_CLASS (gdk_wayland_gl_context_parent_class)->end_frame (draw_context, painted);
-  if (gdk_gl_context_get_shared_context (context))
-    return;
 
   gdk_gl_context_make_current (context);
 
-  egl_surface = gdk_wayland_surface_get_egl_surface (surface,
-                                                    context_wayland->egl_config);
-
+  egl_surface = gdk_wayland_surface_get_egl_surface (surface);
   gdk_wayland_surface_sync (surface);
   gdk_wayland_surface_request_frame (surface);
 
@@ -322,9 +350,12 @@ gdk_wayland_gl_context_class_init (GdkWaylandGLContextClass *klass)
 
   gobject_class->dispose = gdk_wayland_gl_context_dispose;
 
+  draw_context_class->begin_frame = gdk_wayland_gl_context_begin_frame;
   draw_context_class->end_frame = gdk_wayland_gl_context_end_frame;
 
   context_class->realize = gdk_wayland_gl_context_realize;
+  context_class->make_current = gdk_wayland_gl_context_make_current;
+  context_class->clear_current = gdk_wayland_gl_context_clear_current;
   context_class->get_damage = gdk_wayland_gl_context_get_damage;
 }
 
@@ -340,6 +371,8 @@ gdk_wayland_gl_context_init (GdkWaylandGLContext *self)
  * Retrieves the EGL display connection object for the given GDK display.
  *
  * Returns: (nullable): the EGL display
+ *
+ * Since: 4.4
  */
 gpointer
 gdk_wayland_display_get_egl_display (GdkDisplay *display)
@@ -348,7 +381,7 @@ gdk_wayland_display_get_egl_display (GdkDisplay *display)
 
   g_return_val_if_fail (GDK_IS_WAYLAND_DISPLAY (display), NULL);
 
-  if (!gdk_wayland_display_init_gl (display))
+  if (!gdk_display_prepare_gl (display, NULL))
     return NULL;
 
   display_wayland = GDK_WAYLAND_DISPLAY (display);
@@ -393,71 +426,11 @@ out:
   return dpy;
 }
 
-gboolean
-gdk_wayland_display_init_gl (GdkDisplay *display)
-{
-  GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
-  EGLint major, minor;
-  EGLDisplay dpy;
-
-  if (display_wayland->have_egl)
-    return TRUE;
-
-  dpy = get_egl_display (display_wayland);
-
-  if (dpy == NULL)
-    return FALSE;
-
-  if (!eglInitialize (dpy, &major, &minor))
-    return FALSE;
-
-  if (!eglBindAPI (EGL_OPENGL_API))
-    return FALSE;
-
-  display_wayland->egl_display = dpy;
-  display_wayland->egl_major_version = major;
-  display_wayland->egl_minor_version = minor;
-
-  display_wayland->have_egl = TRUE;
-
-  display_wayland->have_egl_khr_create_context =
-    epoxy_has_egl_extension (dpy, "EGL_KHR_create_context");
-
-  display_wayland->have_egl_buffer_age =
-    epoxy_has_egl_extension (dpy, "EGL_EXT_buffer_age");
-
-  display_wayland->have_egl_swap_buffers_with_damage =
-    epoxy_has_egl_extension (dpy, "EGL_EXT_swap_buffers_with_damage");
-
-  display_wayland->have_egl_surfaceless_context =
-    epoxy_has_egl_extension (dpy, "EGL_KHR_surfaceless_context");
-
-  GDK_DISPLAY_NOTE (display, OPENGL,
-            g_message ("EGL API version %d.%d found\n"
-                       " - Vendor: %s\n"
-                       " - Version: %s\n"
-                       " - Client APIs: %s\n"
-                       " - Extensions:\n"
-                       "\t%s",
-                       display_wayland->egl_major_version,
-                       display_wayland->egl_minor_version,
-                       eglQueryString (dpy, EGL_VENDOR),
-                       eglQueryString (dpy, EGL_VERSION),
-                       eglQueryString (dpy, EGL_CLIENT_APIS),
-                       eglQueryString (dpy, EGL_EXTENSIONS)));
-
-  return TRUE;
-}
-
 #define MAX_EGL_ATTRS   30
 
-static gboolean
-find_eglconfig_for_surface (GdkSurface  *surface,
-                           EGLConfig  *egl_config_out,
-                           GError    **error)
+static EGLConfig
+get_eglconfig (EGLDisplay dpy)
 {
-  GdkDisplay *display = gdk_surface_get_display (surface);
-  GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
   EGLint attrs[MAX_EGL_ATTRS];
   EGLint count;
   EGLConfig config;
@@ -482,59 +455,129 @@ find_eglconfig_for_surface (GdkSurface  *surface,
   g_assert (i < MAX_EGL_ATTRS);
 
   /* Pick first valid configuration i guess? */
-  if (!eglChooseConfig (display_wayland->egl_display, attrs, &config, 1, &count) || count < 1)
-    {
-      g_set_error_literal (error, GDK_GL_ERROR,
-                           GDK_GL_ERROR_UNSUPPORTED_FORMAT,
-                           _("No available configurations for the given pixel format"));
-      return FALSE;
-    }
+  if (!eglChooseConfig (dpy, attrs, &config, 1, &count) || count < 1)
+    return NULL;
 
-  g_assert (egl_config_out);
-  *egl_config_out = config;
-
-  return TRUE;
+  return config;
 }
 
-GdkGLContext *
-gdk_wayland_surface_create_gl_context (GdkSurface     *surface,
-                                       gboolean       attached,
-                                       GdkGLContext  *share,
-                                       GError       **error)
-{
-  GdkDisplay *display = gdk_surface_get_display (surface);
-  GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
-  GdkWaylandGLContext *context;
-  EGLConfig config;
+#undef MAX_EGL_ATTRS
 
-  if (!gdk_wayland_display_init_gl (display))
+GdkGLContext *
+gdk_wayland_display_init_gl (GdkDisplay  *display,
+                             GError     **error)
+{
+  GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
+  EGLint major, minor;
+  EGLDisplay dpy;
+  GdkGLContext *ctx;
+  G_GNUC_UNUSED gint64 start_time = GDK_PROFILER_CURRENT_TIME;
+  G_GNUC_UNUSED gint64 start_time2;
+
+  start_time2 = GDK_PROFILER_CURRENT_TIME;
+  dpy = get_egl_display (display_wayland);
+  gdk_profiler_end_mark (start_time, "get_egl_display", NULL);
+  if (dpy == NULL)
     {
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_NOT_AVAILABLE,
+                           _("Failed to create EGL display"));
+      return NULL;
+    }
+
+  start_time2 = GDK_PROFILER_CURRENT_TIME;
+  if (!eglInitialize (dpy, &major, &minor))
+    {
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_NOT_AVAILABLE,
+                           _("Could not initialize EGL display"));
+      return NULL;
+    }
+  gdk_profiler_end_mark (start_time2, "eglInitialize", NULL);
+
+  if (major < GDK_EGL_MIN_VERSION_MAJOR ||
+      (major == GDK_EGL_MIN_VERSION_MAJOR && minor < GDK_EGL_MIN_VERSION_MINOR))
+    {
+      eglTerminate (dpy);
+      g_set_error (error, GDK_GL_ERROR,
+                   GDK_GL_ERROR_NOT_AVAILABLE,
+                   _("EGL version %d.%d is too old. GTK requires %d.%d"),
+                   major, minor, GDK_EGL_MIN_VERSION_MAJOR, GDK_EGL_MIN_VERSION_MINOR);
+      return NULL;
+    }
+
+  start_time2 = GDK_PROFILER_CURRENT_TIME;
+  if (!eglBindAPI (EGL_OPENGL_API))
+    {
+      eglTerminate (dpy);
       g_set_error_literal (error, GDK_GL_ERROR,
                            GDK_GL_ERROR_NOT_AVAILABLE,
                            _("No GL implementation is available"));
       return NULL;
     }
+  gdk_profiler_end_mark (start_time2, "eglBindAPI", NULL);
 
-  if (!display_wayland->have_egl_khr_create_context)
+  if (!epoxy_has_egl_extension (dpy, "EGL_KHR_create_context"))
     {
+      eglTerminate (dpy);
       g_set_error_literal (error, GDK_GL_ERROR,
                            GDK_GL_ERROR_UNSUPPORTED_PROFILE,
                            _("Core GL is not available on EGL implementation"));
       return NULL;
     }
 
-  if (!find_eglconfig_for_surface (surface, &config, error))
-    return NULL;
+  if (!epoxy_has_egl_extension (dpy, "EGL_KHR_surfaceless_context"))
+    {
+      eglTerminate (dpy);
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_UNSUPPORTED_PROFILE,
+                           _("Surfaceless contexts are not supported on this EGL implementation"));
+      return NULL;
+    }
 
-  context = g_object_new (GDK_TYPE_WAYLAND_GL_CONTEXT,
-                          "surface", surface,
-                          "shared-context", share,
-                          NULL);
+  start_time2 = GDK_PROFILER_CURRENT_TIME;
+  display_wayland->egl_config = get_eglconfig (dpy);
+  gdk_profiler_end_mark (start_time2, "get_eglconfig", NULL);
+  if (!display_wayland->egl_config)
+    {
+      eglTerminate (dpy);
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_UNSUPPORTED_FORMAT,
+                           _("No available configurations for the given pixel format"));
+      return NULL;
+    }
 
-  context->egl_config = config;
-  context->is_attached = attached;
+  display_wayland->egl_display = dpy;
+  display_wayland->egl_major_version = major;
+  display_wayland->egl_minor_version = minor;
 
-  return GDK_GL_CONTEXT (context);
+  display_wayland->have_egl_buffer_age =
+    epoxy_has_egl_extension (dpy, "EGL_EXT_buffer_age");
+
+  display_wayland->have_egl_swap_buffers_with_damage =
+    epoxy_has_egl_extension (dpy, "EGL_EXT_swap_buffers_with_damage");
+
+  GDK_DISPLAY_NOTE (display, OPENGL,
+            g_message ("EGL API version %d.%d found\n"
+                       " - Vendor: %s\n"
+                       " - Version: %s\n"
+                       " - Client APIs: %s\n"
+                       " - Extensions:\n"
+                       "\t%s",
+                       display_wayland->egl_major_version,
+                       display_wayland->egl_minor_version,
+                       eglQueryString (dpy, EGL_VENDOR),
+                       eglQueryString (dpy, EGL_VERSION),
+                       eglQueryString (dpy, EGL_CLIENT_APIS),
+                       eglQueryString (dpy, EGL_EXTENSIONS)));
+
+  ctx = g_object_new (GDK_TYPE_WAYLAND_GL_CONTEXT,
+                      "display", display,
+                      NULL);
+
+  gdk_profiler_end_mark (start_time, "init Wayland GL", NULL);
+
+  return ctx;
 }
 
 static void
@@ -563,42 +606,3 @@ gdk_wayland_gl_context_dispose (GObject *gobject)
   G_OBJECT_CLASS (gdk_wayland_gl_context_parent_class)->dispose (gobject);
 }
 
-gboolean
-gdk_wayland_display_make_gl_context_current (GdkDisplay   *display,
-                                             GdkGLContext *context)
-{
-  GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
-  GdkWaylandGLContext *context_wayland;
-  GdkSurface *surface;
-  EGLSurface egl_surface;
-
-  if (context == NULL)
-    {
-      eglMakeCurrent(display_wayland->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
-                     EGL_NO_CONTEXT);
-      return TRUE;
-    }
-
-  context_wayland = GDK_WAYLAND_GL_CONTEXT (context);
-  surface = gdk_gl_context_get_surface (context);
-
-  if (context_wayland->is_attached || gdk_draw_context_is_in_frame (GDK_DRAW_CONTEXT (context)))
-    egl_surface = gdk_wayland_surface_get_egl_surface (surface, context_wayland->egl_config);
-  else
-    {
-      if (display_wayland->have_egl_surfaceless_context)
-        egl_surface = EGL_NO_SURFACE;
-      else
-        egl_surface = gdk_wayland_surface_get_dummy_egl_surface (surface,
-                                                                 context_wayland->egl_config);
-    }
-
-  if (!eglMakeCurrent (display_wayland->egl_display, egl_surface,
-                       egl_surface, context_wayland->egl_context))
-    {
-      g_warning ("eglMakeCurrent failed");
-      return FALSE;
-    }
-
-  return TRUE;
-}

gdk/wayland/gdkglcontext-wayland.h

@@ -36,8 +36,6 @@ struct _GdkWaylandGLContext
   GdkGLContext parent_instance;
 
   EGLContext egl_context;
-  EGLConfig egl_config;
-  gboolean is_attached;
 };
 
 struct _GdkWaylandGLContextClass
@@ -45,13 +43,8 @@ struct _GdkWaylandGLContextClass
   GdkGLContextClass parent_class;
 };
 
-gboolean        gdk_wayland_display_init_gl                         (GdkDisplay        *display);
-GdkGLContext *  gdk_wayland_surface_create_gl_context                (GdkSurface         *surface,
-								     gboolean           attach,
-                                                                     GdkGLContext      *share,
+GdkGLContext *  gdk_wayland_display_init_gl                         (GdkDisplay        *display,
                                                                      GError           **error);
-gboolean        gdk_wayland_display_make_gl_context_current         (GdkDisplay        *display,
-                                                                     GdkGLContext      *context);
 
 G_END_DECLS
 

gdk/wayland/gdkprivate-wayland.h

@@ -182,11 +182,6 @@ cairo_surface_t * _gdk_wayland_display_create_shm_surface (GdkWaylandDisplay *di
 struct wl_buffer *_gdk_wayland_shm_surface_get_wl_buffer (cairo_surface_t *surface);
 gboolean _gdk_wayland_is_shm_surface (cairo_surface_t *surface);
 
-EGLSurface gdk_wayland_surface_get_egl_surface (GdkSurface *surface,
-                                               EGLConfig config);
-EGLSurface gdk_wayland_surface_get_dummy_egl_surface (GdkSurface *surface,
-                                                     EGLConfig config);
-
 struct gtk_surface1 * gdk_wayland_surface_get_gtk_surface (GdkSurface *surface);
 
 void gdk_wayland_seat_set_global_cursor (GdkSeat   *seat,

gdk/wayland/gdksurface-wayland.c

@@ -103,7 +103,6 @@ struct _GdkWaylandSurface
 
     struct gtk_surface1  *gtk_surface;
     struct wl_egl_window *egl_window;
-    struct wl_egl_window *dummy_egl_window;
     struct zxdg_exported_v1 *xdg_exported;
     struct org_kde_kwin_server_decoration *server_decoration;
   } display_server;
@@ -111,7 +110,6 @@ struct _GdkWaylandSurface
   struct wl_event_queue *event_queue;
 
   EGLSurface egl_surface;
-  EGLSurface dummy_egl_surface;
 
   uint32_t reposition_token;
   uint32_t received_reposition_token;
@@ -2901,18 +2899,6 @@ gdk_wayland_surface_hide_surface (GdkSurface *surface)
 
   if (impl->display_server.wl_surface)
     {
-      if (impl->dummy_egl_surface)
-        {
-          eglDestroySurface (display_wayland->egl_display, impl->dummy_egl_surface);
-          impl->dummy_egl_surface = NULL;
-        }
-
-      if (impl->display_server.dummy_egl_window)
-        {
-          wl_egl_window_destroy (impl->display_server.dummy_egl_window);
-          impl->display_server.dummy_egl_window = NULL;
-        }
-
       if (impl->egl_surface)
         {
           eglDestroySurface (display_wayland->egl_display, impl->egl_surface);
@@ -4238,7 +4224,6 @@ gdk_wayland_surface_class_init (GdkWaylandSurfaceClass *klass)
   impl_class->drag_begin = _gdk_wayland_surface_drag_begin;
   impl_class->get_scale_factor = gdk_wayland_surface_get_scale_factor;
   impl_class->set_opaque_region = gdk_wayland_surface_set_opaque_region;
-  impl_class->create_gl_context = gdk_wayland_surface_create_gl_context;
   impl_class->request_layout = gdk_wayland_surface_request_layout;
   impl_class->compute_size = gdk_wayland_surface_compute_size;
 }
@@ -4304,8 +4289,7 @@ gdk_wayland_surface_get_wl_egl_window (GdkSurface *surface)
 }
 
 EGLSurface
-gdk_wayland_surface_get_egl_surface (GdkSurface *surface,
-                                     EGLConfig   config)
+gdk_wayland_surface_get_egl_surface (GdkSurface *surface)
 {
   GdkWaylandDisplay *display = GDK_WAYLAND_DISPLAY (gdk_surface_get_display (surface));
   GdkWaylandSurface *impl;
@@ -4320,35 +4304,12 @@ gdk_wayland_surface_get_egl_surface (GdkSurface *surface,
       egl_window = gdk_wayland_surface_get_wl_egl_window (surface);
 
       impl->egl_surface =
-        eglCreateWindowSurface (display->egl_display, config, egl_window, NULL);
+        eglCreateWindowSurface (display->egl_display, display->egl_config, egl_window, NULL);
     }
 
   return impl->egl_surface;
 }
 
-EGLSurface
-gdk_wayland_surface_get_dummy_egl_surface (GdkSurface *surface,
-                                           EGLConfig   config)
-{
-  GdkWaylandDisplay *display = GDK_WAYLAND_DISPLAY (gdk_surface_get_display (surface));
-  GdkWaylandSurface *impl;
-
-  g_return_val_if_fail (GDK_IS_WAYLAND_SURFACE (surface), NULL);
-
-  impl = GDK_WAYLAND_SURFACE (surface);
-
-  if (impl->dummy_egl_surface == NULL)
-    {
-      impl->display_server.dummy_egl_window =
-        wl_egl_window_create (impl->display_server.wl_surface, 1, 1);
-
-      impl->dummy_egl_surface =
-        eglCreateWindowSurface (display->egl_display, config, impl->display_server.dummy_egl_window, NULL);
-    }
-
-  return impl->dummy_egl_surface;
-}
-
 struct gtk_surface1 *
 gdk_wayland_surface_get_gtk_surface (GdkSurface *surface)
 {

gdk/wayland/gdksurface-wayland.h

@@ -22,6 +22,9 @@
 
 #include "gdkwaylandsurface.h"
 
+#include <wayland-egl.h>
+#include <epoxy/egl.h>
+
 G_BEGIN_DECLS
 
 void                     gdk_wayland_toplevel_set_dbus_properties       (GdkToplevel *toplevel,
@@ -38,4 +41,6 @@ void                     gdk_wayland_toplevel_announce_ssd              (GdkTopl
 gboolean                 gdk_wayland_toplevel_inhibit_idle              (GdkToplevel *toplevel);
 void                     gdk_wayland_toplevel_uninhibit_idle            (GdkToplevel *toplevel);
 
+EGLSurface               gdk_wayland_surface_get_egl_surface            (GdkSurface  *surface);
+
 G_END_DECLS

gdk/win32/gdkdisplay-win32.c

@@ -481,6 +481,7 @@ register_display_change_notification (GdkDisplay *display)
   wclass.lpszClassName = "GdkDisplayChange";
   wclass.lpfnWndProc = display_change_window_procedure;
   wclass.hInstance = _gdk_app_hmodule;
+  wclass.style = CS_OWNDC;
 
   klass = RegisterClass (&wclass);
   if (klass)
@@ -656,6 +657,13 @@ gdk_win32_display_dispose (GObject *object)
 
   if (display_win32->hwnd != NULL)
     {
+      if (display_win32->dummy_context_wgl.hglrc != NULL)
+        {
+          wglMakeCurrent (NULL, NULL);
+          wglDeleteContext (display_win32->dummy_context_wgl.hglrc);
+          display_win32->dummy_context_wgl.hglrc = NULL;
+        }
+
       DestroyWindow (display_win32->hwnd);
       display_win32->hwnd = NULL;
     }
@@ -982,31 +990,32 @@ _gdk_win32_check_on_arm64 (GdkWin32Display *display)
 }
 
 static void
-gdk_win32_display_init (GdkWin32Display *display)
+gdk_win32_display_init (GdkWin32Display *display_win32)
 {
   const char *scale_str = g_getenv ("GDK_SCALE");
 
-  display->monitors = G_LIST_MODEL (g_list_store_new (GDK_TYPE_MONITOR));
+  display_win32->monitors = G_LIST_MODEL (g_list_store_new (GDK_TYPE_MONITOR));
 
-  _gdk_win32_enable_hidpi (display);
-  _gdk_win32_check_on_arm64 (display);
+  _gdk_win32_enable_hidpi (display_win32);
+  _gdk_win32_check_on_arm64 (display_win32);
 
   /* if we have DPI awareness, set up fixed scale if set */
-  if (display->dpi_aware_type != PROCESS_DPI_UNAWARE &&
+  if (display_win32->dpi_aware_type != PROCESS_DPI_UNAWARE &&
       scale_str != NULL)
     {
-      display->surface_scale = atol (scale_str);
+      display_win32->surface_scale = atol (scale_str);
 
-      if (display->surface_scale <= 0)
-        display->surface_scale = 1;
+      if (display_win32->surface_scale <= 0)
+        display_win32->surface_scale = 1;
 
-      display->has_fixed_scale = TRUE;
+      display_win32->has_fixed_scale = TRUE;
     }
   else
-    display->surface_scale = _gdk_win32_display_get_monitor_scale_factor (display, NULL, NULL, NULL);
+    display_win32->surface_scale =
+      gdk_win32_display_get_monitor_scale_factor (display_win32, NULL, NULL);
 
-  _gdk_win32_display_init_cursors (display);
-  gdk_win32_display_check_composited (display);
+  _gdk_win32_display_init_cursors (display_win32);
+  gdk_win32_display_check_composited (display_win32);
 }
 
 void
@@ -1057,64 +1066,64 @@ gdk_win32_display_get_monitors (GdkDisplay *display)
 }
 
 guint
-_gdk_win32_display_get_monitor_scale_factor (GdkWin32Display *win32_display,
-                                             HMONITOR         hmonitor,
-                                             HWND             hwnd,
-                                             int             *dpi)
+gdk_win32_display_get_monitor_scale_factor (GdkWin32Display *display_win32,
+                                            GdkSurface      *surface,
+                                            HMONITOR         hmonitor)
 {
   gboolean is_scale_acquired = FALSE;
   gboolean use_dpi_for_monitor = FALSE;
   guint dpix, dpiy;
 
-  if (win32_display->have_at_least_win81)
+  if (display_win32->have_at_least_win81)
     {
-      if (hmonitor != NULL)
+      if (surface != NULL && hmonitor == NULL)
+        hmonitor = MonitorFromWindow (GDK_SURFACE_HWND (surface),
+                                      MONITOR_DEFAULTTONEAREST);
+      if (hmonitor != NULL &&
+          display_win32->shcore_funcs.hshcore != NULL &&
+          display_win32->shcore_funcs.getDpiForMonitorFunc != NULL)
         use_dpi_for_monitor = TRUE;
-
-      else
-        {
-          if (hwnd != NULL)
-            {
-              hmonitor = MonitorFromWindow (hwnd, MONITOR_DEFAULTTONEAREST);
-              use_dpi_for_monitor = TRUE;
-            }
-        }
     }
 
   if (use_dpi_for_monitor)
     {
       /* Use GetDpiForMonitor() for Windows 8.1+, when we have a HMONITOR */
-      if (win32_display->shcore_funcs.hshcore != NULL &&
-          win32_display->shcore_funcs.getDpiForMonitorFunc != NULL)
-        {
-          if (win32_display->shcore_funcs.getDpiForMonitorFunc (hmonitor,
-                                                                MDT_EFFECTIVE_DPI,
-                                                                &dpix,
-                                                                &dpiy) == S_OK)
-            {
-              is_scale_acquired = TRUE;
-            }
-        }
+      if (display_win32->shcore_funcs.getDpiForMonitorFunc (hmonitor,
+                                                            MDT_EFFECTIVE_DPI,
+                                                           &dpix,
+                                                           &dpiy) == S_OK)
+        is_scale_acquired = TRUE;
     }
   else
     {
       /* Go back to GetDeviceCaps() for Windows 8 and earlier, or when we don't
        * have a HMONITOR nor a HWND
        */
-      HDC hdc = GetDC (hwnd);
+      HDC hdc;
+
+      if (surface != NULL)
+        {
+          if (GDK_WIN32_SURFACE (surface)->hdc == NULL)
+            GDK_WIN32_SURFACE (surface)->hdc = GetDC (GDK_SURFACE_HWND (surface));
+
+          hdc = GDK_WIN32_SURFACE (surface)->hdc;
+        }
+      else
+        hdc = GetDC (NULL);
 
       /* in case we can't get the DC for the window, return 1 for the scale */
       if (hdc == NULL)
-        {
-          if (dpi != NULL)
-            *dpi = USER_DEFAULT_SCREEN_DPI;
-
-          return 1;
-        }
+        return 1;
 
       dpix = GetDeviceCaps (hdc, LOGPIXELSX);
       dpiy = GetDeviceCaps (hdc, LOGPIXELSY);
-      ReleaseDC (hwnd, hdc);
+
+      /*
+       * If surface is not NULL, the HDC should not be released, since surfaces have
+       * Win32 windows created with CS_OWNDC
+       */
+      if (surface == NULL)
+        ReleaseDC (NULL, hdc);
 
       is_scale_acquired = TRUE;
     }
@@ -1122,21 +1131,13 @@ _gdk_win32_display_get_monitor_scale_factor (GdkWin32Display *win32_display,
   if (is_scale_acquired)
     /* USER_DEFAULT_SCREEN_DPI = 96, in winuser.h */
     {
-      if (dpi != NULL)
-        *dpi = dpix;
-
-      if (win32_display->has_fixed_scale)
-        return win32_display->surface_scale;
+      if (display_win32->has_fixed_scale)
+        return display_win32->surface_scale;
       else
         return dpix / USER_DEFAULT_SCREEN_DPI > 1 ? dpix / USER_DEFAULT_SCREEN_DPI : 1;
     }
   else
-    {
-      if (dpi != NULL)
-        *dpi = USER_DEFAULT_SCREEN_DPI;
-
-      return 1;
-  }
+    return 1;
 }
 
 static gboolean
@@ -1147,6 +1148,85 @@ gdk_win32_display_get_setting (GdkDisplay  *display,
   return _gdk_win32_get_setting (name, value);
 }
 
+static gboolean
+gdk_win32_display_init_gl_backend (GdkDisplay  *display,
+                                   GError     **error)
+{
+#ifdef GDK_WIN32_ENABLE_EGL
+  if (GDK_DISPLAY_DEBUG_CHECK (display, GL_EGL))
+    return gdk_win32_display_init_egl (display, error);
+#endif
+  if (GDK_DISPLAY_DEBUG_CHECK (display, GL_WGL))
+    return gdk_win32_display_init_wgl (display, error);
+
+  /* No env vars set, do the regular GL initialization, first WGL and then EGL,
+   * as WGL is the more tried-and-tested configuration.
+   */
+
+  if (gdk_win32_display_init_wgl (display, error))
+    return TRUE;
+  g_clear_error (error);
+
+#ifdef GDK_WIN32_ENABLE_EGL
+  if (gdk_win32_display_init_egl (display, error))
+    return TRUE;
+#endif
+  g_clear_error (error);
+
+  return gdk_win32_display_init_wgl (display, error);
+}
+
+static GdkGLContext *
+gdk_win32_display_init_gl (GdkDisplay  *display,
+                           GError     **error)
+{
+  GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
+  GdkGLContext *gl_context = NULL;
+
+  if (!gdk_win32_display_init_gl_backend (display, error))
+    return NULL;
+
+#ifdef GDK_WIN32_ENABLE_EGL
+  if (display_win32->egl_disp)
+    gl_context = g_object_new (GDK_TYPE_WIN32_GL_CONTEXT_EGL, "display", display, NULL);
+  else
+#endif
+  if (display_win32->wgl_pixel_format != 0)
+    gl_context = g_object_new (GDK_TYPE_WIN32_GL_CONTEXT_WGL, "display", display, NULL);
+
+  g_return_val_if_fail (gl_context != NULL, NULL);
+
+  return gl_context;
+}
+
+/**
+ * gdk_win32_display_get_egl_display:
+ * @display: (type GdkWin32Display): a Win32 display
+ *
+ * Retrieves the EGL display connection object for the given GDK display.
+ *
+ * Returns: (nullable): the EGL display
+ */
+gpointer
+gdk_win32_display_get_egl_display (GdkDisplay *display)
+{
+  GdkWin32Display *display_win32;
+
+  g_return_val_if_fail (GDK_IS_WIN32_DISPLAY (display), NULL);
+
+#ifdef GDK_WIN32_ENABLE_EGL
+  display_win32 = GDK_WIN32_DISPLAY (display);
+
+  if (display_win32->wgl_pixel_format != 0)
+    return NULL;
+
+  return display_win32->egl_disp;
+#else
+  /* no EGL support */
+  return NULL;
+#endif
+}
+
 static void
 gdk_win32_display_class_init (GdkWin32DisplayClass *klass)
 {
@@ -1172,7 +1252,6 @@ gdk_win32_display_class_init (GdkWin32DisplayClass *klass)
   display_class->create_surface = _gdk_win32_display_create_surface;
 
   display_class->get_keymap = _gdk_win32_display_get_keymap;
-  display_class->make_gl_context_current = _gdk_win32_display_make_gl_context_current;
 
   display_class->get_monitors = gdk_win32_display_get_monitors;
 
@@ -1183,6 +1262,7 @@ gdk_win32_display_class_init (GdkWin32DisplayClass *klass)
 
   display_class->get_setting = gdk_win32_display_get_setting;
   display_class->set_cursor_theme = gdk_win32_display_set_cursor_theme;
+  display_class->init_gl = gdk_win32_display_init_gl;
 
   _gdk_win32_surfaceing_init ();
 }

gdk/win32/gdkdisplay-win32.h

@@ -106,6 +106,12 @@ typedef struct _GdkWin32KernelCPUFuncs
   funcIsWow64Process2 isWow64Process2;
 } GdkWin32KernelCPUFuncs;
 
+typedef struct
+{
+  HDC hdc;
+  HGLRC hglrc;
+} GdkWin32GLDummyContextWGL;
+
 struct _GdkWin32Display
 {
   GdkDisplay display;
@@ -119,15 +125,15 @@ struct _GdkWin32Display
   HWND hwnd;
 
   /* WGL/OpenGL Items */
-  guint have_wgl : 1;
+  GdkWin32GLDummyContextWGL dummy_context_wgl;
+  int wgl_pixel_format;
   guint gl_version;
-  HWND gl_hwnd;
 
 #ifdef GDK_WIN32_ENABLE_EGL
   /* EGL (Angle) Items */
-  guint have_egl : 1;
   guint egl_version;
   EGLDisplay egl_disp;
+  EGLConfig egl_config;
   HDC hdc_egl_temp;
 #endif
 
@@ -185,10 +191,9 @@ GPtrArray *_gdk_win32_display_get_monitor_list (GdkWin32Display *display);
 
 void        gdk_win32_display_check_composited (GdkWin32Display *display);
 
-guint      _gdk_win32_display_get_monitor_scale_factor (GdkWin32Display *win32_display,
-                                                        HMONITOR         hmonitor,
-                                                        HWND             hwnd,
-                                                        int              *dpi);
+guint      gdk_win32_display_get_monitor_scale_factor (GdkWin32Display *display_win32,
+                                                       GdkSurface      *surface,
+                                                       HMONITOR         hmonitor);
 
 typedef struct _GdkWin32MessageFilter GdkWin32MessageFilter;
 

gdk/win32/gdkdrag-win32.c

@@ -793,7 +793,7 @@ gdk_drag_new (GdkDisplay         *display,
               GdkDragProtocol     protocol)
 {
   GdkWin32Drag *drag_win32;
-  GdkWin32Display *win32_display = GDK_WIN32_DISPLAY (display);
+  GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
   GdkDrag *drag;
 
   drag_win32 = g_object_new (GDK_TYPE_WIN32_DRAG,
@@ -805,10 +805,10 @@ gdk_drag_new (GdkDisplay         *display,
 
   drag = GDK_DRAG (drag_win32);
 
-  if (win32_display->has_fixed_scale)
-    drag_win32->scale = win32_display->surface_scale;
+  if (display_win32->has_fixed_scale)
+    drag_win32->scale = display_win32->surface_scale;
   else
-    drag_win32->scale = _gdk_win32_display_get_monitor_scale_factor (win32_display, NULL, NULL, NULL);
+    drag_win32->scale = gdk_win32_display_get_monitor_scale_factor (display_win32, NULL, NULL);
 
   drag_win32->protocol = protocol;
 
@@ -2345,8 +2345,8 @@ gdk_dnd_handle_motion_event (GdkDrag  *drag,
   state = gdk_event_get_modifier_state (event);
   gdk_event_get_position (event, &x, &y);
 
-  x_root = x + _gdk_offset_x;
-  y_root = y + _gdk_offset_y;
+  x_root = event->surface->x + x;
+  y_root = event->surface->y + y;
 
   if (drag_win32->drag_surface)
     move_drag_surface (drag, x_root, y_root);

gdk/win32/gdkdrop-win32.c

@@ -177,7 +177,7 @@ gdk_drop_new (GdkDisplay        *display,
               GdkDragProtocol    protocol)
 {
   GdkWin32Drop *drop_win32;
-  GdkWin32Display *win32_display = GDK_WIN32_DISPLAY (display);
+  GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
 
   drop_win32 = g_object_new (GDK_TYPE_WIN32_DROP,
                              "device", device,
@@ -186,10 +186,10 @@ gdk_drop_new (GdkDisplay        *display,
                              "surface", surface,
                              NULL);
 
-  if (win32_display->has_fixed_scale)
-    drop_win32->scale = win32_display->surface_scale;
+  if (display_win32->has_fixed_scale)
+    drop_win32->scale = display_win32->surface_scale;
   else
-    drop_win32->scale = _gdk_win32_display_get_monitor_scale_factor (win32_display, NULL, NULL, NULL);
+    drop_win32->scale = gdk_win32_display_get_monitor_scale_factor (display_win32, NULL, NULL);
 
   drop_win32->protocol = protocol;
 

gdk/win32/gdkevents-win32.c

@@ -2343,7 +2343,6 @@ gdk_event_translate (MSG *msg,
       current_root_x = (msg->pt.x + _gdk_offset_x) / impl->surface_scale;
       current_root_y = (msg->pt.y + _gdk_offset_y) / impl->surface_scale;
 
-
       if (impl->drag_move_resize_context.op != GDK_WIN32_DRAGOP_NONE)
         gdk_win32_surface_do_move_resize_drag (window, current_root_x, current_root_y);
       else if (_gdk_input_ignore_core == 0)

gdk/win32/gdkglcontext-win32-egl.c

@@ -0,0 +1,504 @@
+/* GDK - The GIMP Drawing Kit
+ *
+ * gdkglcontext-win32.c: Win32 specific OpenGL wrappers
+ *
+ * Copyright © 2014 Emmanuele Bassi
+ * Copyright © 2014 Alexander Larsson
+ * Copyright © 2014 Chun-wei Fan
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "gdkprivate-win32.h"
+#include "gdksurface-win32.h"
+#include "gdkglcontext-win32.h"
+#include "gdkdisplay-win32.h"
+
+#include "gdkwin32display.h"
+#include "gdkwin32glcontext.h"
+#include "gdkwin32misc.h"
+#include "gdkwin32screen.h"
+#include "gdkwin32surface.h"
+
+#include "gdkglcontext.h"
+#include "gdksurface.h"
+#include "gdkinternals.h"
+#include "gdkintl.h"
+
+#include <cairo.h>
+#include <epoxy/egl.h>
+
+struct _GdkWin32GLContextEGL
+{
+  GdkWin32GLContext parent_instance;
+
+  /* EGL (Angle) Context Items */
+  EGLContext egl_context;
+  guint do_frame_sync : 1;
+};
+
+typedef struct _GdkWin32GLContextClass    GdkWin32GLContextEGLClass;
+
+G_DEFINE_TYPE (GdkWin32GLContextEGL, gdk_win32_gl_context_egl, GDK_TYPE_WIN32_GL_CONTEXT)
+
+static void
+gdk_win32_gl_context_egl_dispose (GObject *gobject)
+{
+  GdkGLContext *context = GDK_GL_CONTEXT (gobject);
+  GdkWin32GLContextEGL *context_egl = GDK_WIN32_GL_CONTEXT_EGL (gobject);
+  GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (gdk_gl_context_get_display (context));
+  GdkSurface *surface = gdk_gl_context_get_surface (context);
+
+  if (display_win32 != NULL)
+    {
+      if (eglGetCurrentContext () == context_egl->egl_context)
+        eglMakeCurrent(display_win32->egl_disp, EGL_NO_SURFACE, EGL_NO_SURFACE,
+                       EGL_NO_CONTEXT);
+
+      GDK_NOTE (OPENGL, g_message ("Destroying EGL (ANGLE) context"));
+
+      eglDestroyContext (display_win32->egl_disp,
+                         context_egl->egl_context);
+      context_egl->egl_context = EGL_NO_CONTEXT;
+    }
+
+  G_OBJECT_CLASS (gdk_win32_gl_context_egl_parent_class)->dispose (gobject);
+}
+
+static gboolean
+is_egl_force_redraw (GdkSurface *surface)
+{
+  /* We only need to call gdk_window_invalidate_rect () if necessary */
+  if (surface->gl_paint_context != NULL && gdk_gl_context_get_use_es (surface->gl_paint_context))
+    {
+      GdkWin32Surface *impl = GDK_WIN32_SURFACE (surface);
+
+      return impl->egl_force_redraw_all;
+    }
+  return FALSE;
+}
+
+static void
+reset_egl_force_redraw (GdkSurface *surface)
+{
+  if (surface->gl_paint_context != NULL && gdk_gl_context_get_use_es (surface->gl_paint_context))
+    {
+      GdkWin32Surface *impl = GDK_WIN32_SURFACE (surface);
+
+      if (impl->egl_force_redraw_all)
+        impl->egl_force_redraw_all = FALSE;
+    }
+}
+
+static void
+gdk_win32_gl_context_egl_end_frame (GdkDrawContext *draw_context,
+                                    cairo_region_t *painted)
+{
+  GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
+  GdkWin32GLContextEGL *context_egl = GDK_WIN32_GL_CONTEXT_EGL (context);
+  GdkSurface *surface = gdk_gl_context_get_surface (context);
+  GdkWin32Display *display_win32 = (GDK_WIN32_DISPLAY (gdk_gl_context_get_display (context)));
+  cairo_rectangle_int_t whole_window;
+  EGLSurface egl_surface;
+
+  GDK_DRAW_CONTEXT_CLASS (gdk_win32_gl_context_egl_parent_class)->end_frame (draw_context, painted);
+
+  gdk_gl_context_make_current (context);
+  whole_window =
+    (GdkRectangle) { 0, 0,
+	                 gdk_surface_get_width (surface),
+					 gdk_surface_get_height (surface)
+                   };
+
+  egl_surface = gdk_win32_surface_get_egl_surface (surface, display_win32->egl_config, FALSE);
+
+  if (is_egl_force_redraw (surface))
+    {
+      GdkRectangle rect = {0, 0, gdk_surface_get_width (surface), gdk_surface_get_height (surface)};
+
+      /* We need to do gdk_window_invalidate_rect() so that we don't get glitches after maximizing or
+       *  restoring or using aerosnap
+       */
+      gdk_surface_invalidate_rect (surface, &rect);
+      reset_egl_force_redraw (surface);
+    }
+
+  eglSwapBuffers (display_win32->egl_disp, egl_surface);
+}
+
+#ifndef EGL_PLATFORM_ANGLE_ANGLE
+#define EGL_PLATFORM_ANGLE_ANGLE          0x3202
+#endif
+
+#ifndef EGL_PLATFORM_ANGLE_TYPE_ANGLE
+#define EGL_PLATFORM_ANGLE_TYPE_ANGLE     0x3203
+#endif
+
+#ifndef EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE
+#define EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE 0x3208
+#endif
+
+static EGLDisplay
+gdk_win32_get_egl_display (GdkWin32Display *display)
+{
+  EGLDisplay disp;
+
+  if (epoxy_has_egl_extension (NULL, "EGL_EXT_platform_base"))
+    {
+      PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplay = (void *) eglGetProcAddress ("eglGetPlatformDisplayEXT");
+      if (getPlatformDisplay)
+        {
+          EGLint disp_attr[] = {EGL_PLATFORM_ANGLE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE, EGL_NONE};
+
+          disp = getPlatformDisplay (EGL_PLATFORM_ANGLE_ANGLE, display->hdc_egl_temp, disp_attr);
+
+          if (disp != EGL_NO_DISPLAY)
+            return disp;
+        }
+    }
+
+  return eglGetDisplay (display->hdc_egl_temp);
+}
+
+#define MAX_EGL_ATTRS   30
+
+static gboolean
+find_eglconfig_for_window (GdkWin32Display  *display,
+                           EGLConfig        *egl_config_out,
+                           EGLint           *min_swap_interval_out,
+                           GError          **error)
+{
+  EGLint attrs[MAX_EGL_ATTRS];
+  EGLint count;
+  EGLConfig *configs, chosen_config;
+
+  int i = 0;
+
+  EGLDisplay egl_disp = display->egl_disp;
+
+  attrs[i++] = EGL_CONFORMANT;
+  attrs[i++] = EGL_OPENGL_ES2_BIT;
+  attrs[i++] = EGL_SURFACE_TYPE;
+  attrs[i++] = EGL_WINDOW_BIT;
+
+  attrs[i++] = EGL_COLOR_BUFFER_TYPE;
+  attrs[i++] = EGL_RGB_BUFFER;
+
+  attrs[i++] = EGL_RED_SIZE;
+  attrs[i++] = 1;
+  attrs[i++] = EGL_GREEN_SIZE;
+  attrs[i++] = 1;
+  attrs[i++] = EGL_BLUE_SIZE;
+  attrs[i++] = 1;
+  attrs[i++] = EGL_ALPHA_SIZE;
+  attrs[i++] = 1;
+
+  attrs[i++] = EGL_NONE;
+  g_assert (i < MAX_EGL_ATTRS);
+
+  if (!eglChooseConfig (display->egl_disp, attrs, NULL, 0, &count) || count < 1)
+    {
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_UNSUPPORTED_FORMAT,
+                           _("No available configurations for the given pixel format"));
+      return FALSE;
+    }
+
+  configs = g_new (EGLConfig, count);
+
+  if (!eglChooseConfig (display->egl_disp, attrs, configs, count, &count) || count < 1)
+    {
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_UNSUPPORTED_FORMAT,
+                           _("No available configurations for the given pixel format"));
+      return FALSE;
+    }
+
+  /* Pick first valid configuration i guess? */
+  chosen_config = configs[0];
+
+  if (!eglGetConfigAttrib (display->egl_disp, chosen_config,
+                           EGL_MIN_SWAP_INTERVAL, min_swap_interval_out))
+    {
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_NOT_AVAILABLE,
+                           "Could not retrieve the minimum swap interval");
+      g_free (configs);
+      return FALSE;
+    }
+
+  if (egl_config_out != NULL)
+    *egl_config_out = chosen_config;
+
+  g_free (configs);
+
+  return TRUE;
+}
+
+gboolean
+gdk_win32_display_init_egl (GdkDisplay  *display,
+                            GError     **error)
+{
+  GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
+  int best_idx = 0;
+  EGLDisplay egl_disp;
+
+  if (display_win32->egl_disp != EGL_NO_DISPLAY)
+    return TRUE;
+  
+  egl_disp = gdk_win32_get_egl_display (display_win32);
+
+  if (egl_disp == EGL_NO_DISPLAY)
+    return FALSE;
+
+  if (!eglInitialize (egl_disp, NULL, NULL))
+    {
+      eglTerminate (egl_disp);
+      egl_disp = EGL_NO_DISPLAY;
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_NOT_AVAILABLE,
+                           _("No GL implementation is available"));
+      return FALSE;
+    }
+
+  display_win32->egl_disp = egl_disp;
+  display_win32->egl_version = epoxy_egl_version (egl_disp);
+
+  eglBindAPI(EGL_OPENGL_ES_API);
+
+  display_win32->hasEglSurfacelessContext =
+    epoxy_has_egl_extension (egl_disp, "EGL_KHR_surfaceless_context");
+
+  GDK_NOTE (OPENGL,
+            g_print ("EGL API version %d.%d found\n"
+                     " - Vendor: %s\n"
+                     " - Checked extensions:\n"
+                     "\t* EGL_KHR_surfaceless_context: %s\n",
+                     display_win32->egl_version / 10,
+                     display_win32->egl_version % 10,
+                     eglQueryString (display_win32->egl_disp, EGL_VENDOR),
+                     display_win32->hasEglSurfacelessContext ? "yes" : "no"));
+
+  return find_eglconfig_for_window (display_win32, &display_win32->egl_config,
+                                   &display_win32->egl_min_swap_interval, error);
+}
+
+#define N_EGL_ATTRS     16
+
+static EGLContext
+create_egl_context (EGLDisplay    display,
+                    EGLConfig     config,
+                    GdkGLContext *share,
+                    int           flags,
+                    int           major,
+                    int           minor,
+                    gboolean     *is_legacy)
+{
+  EGLContext ctx;
+  EGLint context_attribs[N_EGL_ATTRS];
+  int i = 0;
+
+  /* ANGLE does not support the GL_OES_vertex_array_object extension, so we need to use ES3 directly */
+  context_attribs[i++] = EGL_CONTEXT_CLIENT_VERSION;
+  context_attribs[i++] = 3;
+
+  /* Specify the flags */
+  context_attribs[i++] = EGL_CONTEXT_FLAGS_KHR;
+  context_attribs[i++] = flags;
+
+  context_attribs[i++] = EGL_NONE;
+  g_assert (i < N_EGL_ATTRS);
+
+  ctx = eglCreateContext (display,
+                          config,
+                          share != NULL ? GDK_WIN32_GL_CONTEXT_EGL (share)->egl_context
+                                        : EGL_NO_CONTEXT,
+                          context_attribs);
+
+  if (ctx != EGL_NO_CONTEXT)
+    GDK_NOTE (OPENGL, g_message ("Created EGL context[%p]", ctx));
+
+  return ctx;
+}
+
+static gboolean
+gdk_win32_gl_context_egl_realize (GdkGLContext *context,
+                                  GError **error)
+{
+  GdkWin32GLContextEGL *context_egl = GDK_WIN32_GL_CONTEXT_EGL (context);
+
+  gboolean debug_bit, compat_bit, legacy_bit;
+  gboolean use_es = FALSE;
+  EGLContext egl_context;
+  EGLContext ctx;
+
+  /* request flags and specific versions for core (3.2+) WGL context */
+  int flags = 0;
+  int major = 0;
+  int minor = 0;
+
+  GdkSurface *surface = gdk_gl_context_get_surface (context);
+  GdkWin32Surface *impl = GDK_WIN32_SURFACE (surface);
+  GdkDisplay *display = gdk_gl_context_get_display (context);
+  GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
+  GdkGLContext *share = gdk_display_get_gl_context (display);
+
+  gdk_gl_context_get_required_version (context, &major, &minor);
+  debug_bit = gdk_gl_context_get_debug_enabled (context);
+  compat_bit = gdk_gl_context_get_forward_compatible (context);
+
+  /*
+   * A legacy context cannot be shared with core profile ones, so this means we
+   * must stick to a legacy context if the shared context is a legacy context
+   */
+
+  /* if GDK_GL_LEGACY is set, we default to a legacy context */
+  legacy_bit = GDK_DISPLAY_DEBUG_CHECK (display, GL_LEGACY) ?
+               TRUE :
+			   share != NULL && gdk_gl_context_is_legacy (share);
+
+  use_es = GDK_DISPLAY_DEBUG_CHECK (display, GL_GLES) ||
+    (share != NULL && gdk_gl_context_get_use_es (share));
+
+  if (debug_bit)
+    flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
+  if (compat_bit)
+    flags |= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;
+
+  GDK_NOTE (OPENGL, g_message ("Creating EGL context version %d.%d (debug:%s, forward:%s, legacy:%s)",
+                               major, minor,
+                               debug_bit ? "yes" : "no",
+                               compat_bit ? "yes" : "no",
+                               legacy_bit ? "yes" : "no"));
+
+  ctx = create_egl_context (display_win32->egl_disp,
+                            display_win32->egl_config,
+                            share,
+                            flags,
+                            major,
+                            minor,
+                           &legacy_bit);
+
+  if (ctx == EGL_NO_CONTEXT)
+    {
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_NOT_AVAILABLE,
+                           _("Unable to create a GL context"));
+      return FALSE;
+    }
+
+  GDK_NOTE (OPENGL, g_print ("Created EGL context[%p]\n", ctx));
+
+  context_egl->egl_context = ctx;
+
+  /* We are using GLES here */
+  gdk_gl_context_set_use_es (context, TRUE);
+
+  /* Ensure that any other context is created with a legacy bit set */
+  gdk_gl_context_set_is_legacy (context, legacy_bit);
+
+  return TRUE;
+}
+
+static gboolean
+gdk_win32_gl_context_egl_clear_current (GdkGLContext *context)
+{
+  GdkDisplay *display = gdk_gl_context_get_display (context);
+  GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
+
+  if (display_win32->egl_disp != EGL_NO_DISPLAY)
+    return eglMakeCurrent (display_win32->egl_disp,
+                           EGL_NO_SURFACE, 
+                           EGL_NO_SURFACE, 
+                           EGL_NO_CONTEXT);
+  else
+    return TRUE;
+}
+
+static gboolean
+gdk_win32_gl_context_egl_make_current (GdkGLContext *context,
+                                       gboolean      surfaceless)
+{
+  GdkWin32GLContextEGL *context_egl = GDK_WIN32_GL_CONTEXT_EGL (context);
+  GdkDisplay *display = gdk_gl_context_get_display (context);
+  GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
+  GdkSurface *surface;
+
+  gboolean do_frame_sync = FALSE;
+
+  EGLSurface egl_surface;
+
+  surface = gdk_gl_context_get_surface (context);
+
+  if (!surfaceless)
+    egl_surface = gdk_win32_surface_get_egl_surface (surface, display_win32->egl_config, FALSE);
+  else
+    {
+      if (display_win32->hasEglSurfacelessContext)
+        egl_surface = EGL_NO_SURFACE;
+      else
+        egl_surface = gdk_win32_surface_get_egl_surface (surface, display_win32->egl_config, TRUE);
+    }
+
+  if (!eglMakeCurrent (display_win32->egl_disp,
+                       egl_surface,
+                       egl_surface,
+                       context_egl->egl_context))
+    return FALSE;
+
+  if (display_win32->egl_min_swap_interval == 0)
+    eglSwapInterval (display_win32->egl_disp, 0);
+  else
+    g_debug ("Can't disable GL swap interval");
+
+  return TRUE;
+}
+
+static void
+gdk_win32_gl_context_egl_begin_frame (GdkDrawContext *draw_context,
+                                      cairo_region_t *update_area)
+{
+  GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
+  GdkSurface *surface;
+
+  surface = gdk_gl_context_get_surface (context);
+
+  gdk_win32_surface_handle_queued_move_resize (draw_context);
+
+  GDK_DRAW_CONTEXT_CLASS (gdk_win32_gl_context_egl_parent_class)->begin_frame (draw_context, update_area);
+}
+
+static void
+gdk_win32_gl_context_egl_class_init (GdkWin32GLContextClass *klass)
+{
+  GdkGLContextClass *context_class = GDK_GL_CONTEXT_CLASS(klass);
+  GdkDrawContextClass *draw_context_class = GDK_DRAW_CONTEXT_CLASS(klass);
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+  context_class->realize = gdk_win32_gl_context_egl_realize;
+  context_class->make_current = gdk_win32_gl_context_egl_make_current;
+  context_class->clear_current = gdk_win32_gl_context_egl_clear_current;
+
+  draw_context_class->begin_frame = gdk_win32_gl_context_egl_begin_frame;
+  draw_context_class->end_frame = gdk_win32_gl_context_egl_end_frame;
+
+  gobject_class->dispose = gdk_win32_gl_context_egl_dispose;
+}
+
+static void
+gdk_win32_gl_context_egl_init (GdkWin32GLContextEGL *egl_context)
+{
+}

gdk/win32/gdkglcontext-win32-wgl.c

@@ -0,0 +1,727 @@
+/* GDK - The GIMP Drawing Kit
+ *
+ * gdkglcontext-win32.c: Win32 specific OpenGL wrappers
+ *
+ * Copyright © 2014 Emmanuele Bassi
+ * Copyright © 2014 Alexander Larsson
+ * Copyright © 2014 Chun-wei Fan
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "gdkprivate-win32.h"
+#include "gdksurface-win32.h"
+#include "gdkglcontext-win32.h"
+#include "gdkdisplay-win32.h"
+
+#include "gdkwin32display.h"
+#include "gdkwin32glcontext.h"
+#include "gdkwin32misc.h"
+#include "gdkwin32screen.h"
+#include "gdkwin32surface.h"
+
+#include "gdkglcontext.h"
+#include "gdkprofilerprivate.h"
+#include "gdkinternals.h"
+#include "gdkintl.h"
+#include "gdksurface.h"
+
+#include <cairo.h>
+#include <epoxy/wgl.h>
+
+struct _GdkWin32GLContextWGL
+{
+  GdkWin32GLContext parent_instance;
+
+  HGLRC wgl_context;
+  guint do_frame_sync : 1;
+};
+
+typedef struct _GdkWin32GLContextClass    GdkWin32GLContextWGLClass;
+
+G_DEFINE_TYPE (GdkWin32GLContextWGL, gdk_win32_gl_context_wgl, GDK_TYPE_WIN32_GL_CONTEXT)
+
+static void
+gdk_win32_gl_context_wgl_dispose (GObject *gobject)
+{
+  GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (gobject);
+
+  if (context_wgl->wgl_context != NULL)
+    {
+      if (wglGetCurrentContext () == context_wgl->wgl_context)
+        wglMakeCurrent (NULL, NULL);
+
+      GDK_NOTE (OPENGL, g_print ("Destroying WGL context\n"));
+
+      wglDeleteContext (context_wgl->wgl_context);
+      context_wgl->wgl_context = NULL;
+    }
+
+  G_OBJECT_CLASS (gdk_win32_gl_context_wgl_parent_class)->dispose (gobject);
+}
+
+static void
+gdk_win32_gl_context_wgl_end_frame (GdkDrawContext *draw_context,
+                                    cairo_region_t *painted)
+{
+  GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
+  GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (context);
+  GdkSurface *surface = gdk_gl_context_get_surface (context);
+  GdkWin32Display *display_win32 = (GDK_WIN32_DISPLAY (gdk_gl_context_get_display (context)));
+  cairo_rectangle_int_t whole_window;
+  gboolean can_wait = display_win32->hasWglOMLSyncControl;
+  HDC hdc;
+
+  GDK_DRAW_CONTEXT_CLASS (gdk_win32_gl_context_wgl_parent_class)->end_frame (draw_context, painted);
+
+  gdk_gl_context_make_current (context);
+  whole_window = (GdkRectangle) { 0, 0, gdk_surface_get_width (surface), gdk_surface_get_height (surface) };
+
+  gdk_profiler_add_mark (GDK_PROFILER_CURRENT_TIME, 0, "win32", "swap buffers");
+
+  if (surface != NULL)
+    hdc = GDK_WIN32_SURFACE (surface)->hdc;
+  else
+    hdc = display_win32->dummy_context_wgl.hdc;
+
+  if (context_wgl->do_frame_sync)
+    {
+
+      glFinish ();
+
+      if (can_wait)
+        {
+          gint64 ust, msc, sbc;
+
+          wglGetSyncValuesOML (hdc, &ust, &msc, &sbc);
+          wglWaitForMscOML (hdc,
+                            0,
+                            2,
+                            (msc + 1) % 2,
+                           &ust, &msc, &sbc);
+        }
+
+    }
+
+  SwapBuffers (hdc);
+}
+
+static void
+gdk_win32_gl_context_wgl_begin_frame (GdkDrawContext *draw_context,
+                                      cairo_region_t *update_area)
+{
+  GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
+  GdkSurface *surface;
+
+  surface = gdk_gl_context_get_surface (context);
+
+  gdk_win32_surface_handle_queued_move_resize (draw_context);
+
+  GDK_DRAW_CONTEXT_CLASS (gdk_win32_gl_context_wgl_parent_class)->begin_frame (draw_context, update_area);
+}
+
+static int
+gdk_init_dummy_wgl_context (GdkWin32Display *display_win32);
+
+#define PIXEL_ATTRIBUTES 17
+
+static int
+get_wgl_pfd (HDC                    hdc,
+             PIXELFORMATDESCRIPTOR *pfd,
+             GdkWin32Display       *display_win32)
+{
+  int best_pf = 0;
+
+  pfd->nSize = sizeof (PIXELFORMATDESCRIPTOR);
+
+  if (display_win32 != NULL && display_win32->hasWglARBPixelFormat)
+    {
+      UINT num_formats;
+      int colorbits = GetDeviceCaps (hdc, BITSPIXEL);
+      int i = 0;
+      int pixelAttribs[PIXEL_ATTRIBUTES];
+
+      /* Save up the HDC and HGLRC that we are currently using, to restore back to it when we are done here */
+      HDC hdc_current = wglGetCurrentDC ();
+      HGLRC hglrc_current = wglGetCurrentContext ();
+
+      /* Update PIXEL_ATTRIBUTES above if any groups are added here! */
+      pixelAttribs[i] = WGL_DRAW_TO_WINDOW_ARB;
+      pixelAttribs[i++] = GL_TRUE;
+
+      pixelAttribs[i++] = WGL_SUPPORT_OPENGL_ARB;
+      pixelAttribs[i++] = GL_TRUE;
+
+      pixelAttribs[i++] = WGL_DOUBLE_BUFFER_ARB;
+      pixelAttribs[i++] = GL_TRUE;
+
+      pixelAttribs[i++] = WGL_ACCELERATION_ARB;
+      pixelAttribs[i++] = WGL_FULL_ACCELERATION_ARB;
+
+      pixelAttribs[i++] = WGL_PIXEL_TYPE_ARB;
+      pixelAttribs[i++] = WGL_TYPE_RGBA_ARB;
+
+      pixelAttribs[i++] = WGL_COLOR_BITS_ARB;
+      pixelAttribs[i++] = colorbits;
+
+      /* end of "Update PIXEL_ATTRIBUTES above if any groups are added here!" */
+
+      if (display_win32->hasWglARBmultisample)
+        {
+          pixelAttribs[i++] = WGL_SAMPLE_BUFFERS_ARB;
+          pixelAttribs[i++] = 1;
+
+          pixelAttribs[i++] = WGL_SAMPLES_ARB;
+          pixelAttribs[i++] = 8;
+        }
+
+      pixelAttribs[i++] = 0; /* end of pixelAttribs */
+      best_pf = gdk_init_dummy_wgl_context (display_win32);
+
+      if (!wglMakeCurrent (display_win32->dummy_context_wgl.hdc,
+                           display_win32->dummy_context_wgl.hglrc))
+        {
+          wglMakeCurrent (hdc_current, hglrc_current);
+          return 0;
+        }
+
+      wglChoosePixelFormatARB (hdc,
+                               pixelAttribs,
+                               NULL,
+                               1,
+                              &best_pf,
+                              &num_formats);
+
+      /* Go back to the HDC that we were using, since we are done with the dummy HDC and GL Context */
+      wglMakeCurrent (hdc_current, hglrc_current);
+    }
+  else
+    {
+      pfd->nVersion = 1;
+      pfd->dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER;
+      pfd->iPixelType = PFD_TYPE_RGBA;
+      pfd->cColorBits = GetDeviceCaps (hdc, BITSPIXEL);
+      pfd->cAlphaBits = 8;
+      pfd->dwLayerMask = PFD_MAIN_PLANE;
+
+      best_pf = ChoosePixelFormat (hdc, pfd);
+    }
+
+  return best_pf;
+}
+
+/* in WGL, for many OpenGL items, we need a dummy WGL context, so create
+ * one and cache it for later use
+ */
+static int
+gdk_init_dummy_wgl_context (GdkWin32Display *display_win32)
+{
+  PIXELFORMATDESCRIPTOR pfd;
+  gboolean set_pixel_format_result = FALSE;
+  int best_idx = 0;
+
+  if (display_win32->dummy_context_wgl.hdc == NULL)
+    display_win32->dummy_context_wgl.hdc = GetDC (display_win32->hwnd);
+
+  memset (&pfd, 0, sizeof (PIXELFORMATDESCRIPTOR));
+
+  best_idx = get_wgl_pfd (display_win32->dummy_context_wgl.hdc, &pfd, NULL);
+
+  if (best_idx != 0)
+    set_pixel_format_result = SetPixelFormat (display_win32->dummy_context_wgl.hdc,
+                                              best_idx,
+                                             &pfd);
+
+  if (best_idx == 0 || !set_pixel_format_result)
+    return 0;
+
+  display_win32->dummy_context_wgl.hglrc =
+    wglCreateContext (display_win32->dummy_context_wgl.hdc);
+
+  if (display_win32->dummy_context_wgl.hglrc == NULL)
+    return 0;
+
+  return best_idx;
+}
+
+gboolean
+gdk_win32_display_init_wgl (GdkDisplay  *display,
+                            GError     **error)
+{
+  int best_idx = 0;
+  GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
+  HDC hdc;
+
+  if (display_win32->wgl_pixel_format != 0)
+    return TRUE;
+
+  /* acquire and cache dummy Window (HWND & HDC) and
+   * dummy GL Context, it is used to query functions
+   * and used for other stuff as well
+   */
+  best_idx = gdk_init_dummy_wgl_context (display_win32);
+  hdc = display_win32->dummy_context_wgl.hdc;
+
+  if (best_idx == 0 ||
+     !wglMakeCurrent (hdc, display_win32->dummy_context_wgl.hglrc))
+    {
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_NOT_AVAILABLE,
+                           _("No GL implementation is available"));
+
+      return FALSE;
+    }
+
+  display_win32->wgl_pixel_format = best_idx;
+  display_win32->gl_version = epoxy_gl_version ();
+
+  display_win32->hasWglARBCreateContext =
+    epoxy_has_wgl_extension (hdc, "WGL_ARB_create_context");
+  display_win32->hasWglEXTSwapControl =
+    epoxy_has_wgl_extension (hdc, "WGL_EXT_swap_control");
+  display_win32->hasWglOMLSyncControl =
+    epoxy_has_wgl_extension (hdc, "WGL_OML_sync_control");
+  display_win32->hasWglARBPixelFormat =
+    epoxy_has_wgl_extension (hdc, "WGL_ARB_pixel_format");
+  display_win32->hasWglARBmultisample =
+    epoxy_has_wgl_extension (hdc, "WGL_ARB_multisample");
+
+  GDK_NOTE (OPENGL,
+            g_print ("WGL API version %d.%d found\n"
+                     " - Vendor: %s\n"
+                     " - Checked extensions:\n"
+                     "\t* WGL_ARB_pixel_format: %s\n"
+                     "\t* WGL_ARB_create_context: %s\n"
+                     "\t* WGL_EXT_swap_control: %s\n"
+                     "\t* WGL_OML_sync_control: %s\n"
+                     "\t* WGL_ARB_multisample: %s\n",
+                     display_win32->gl_version / 10,
+                     display_win32->gl_version % 10,
+                     glGetString (GL_VENDOR),
+                     display_win32->hasWglARBPixelFormat ? "yes" : "no",
+                     display_win32->hasWglARBCreateContext ? "yes" : "no",
+                     display_win32->hasWglEXTSwapControl ? "yes" : "no",
+                     display_win32->hasWglOMLSyncControl ? "yes" : "no",
+                     display_win32->hasWglARBmultisample ? "yes" : "no"));
+
+  wglMakeCurrent (NULL, NULL);
+
+  return TRUE;
+}
+
+/* Setup the legacy context after creating it */
+static gboolean
+ensure_legacy_wgl_context (HDC           hdc,
+                           HGLRC         hglrc_legacy,
+                           GdkGLContext *share)
+{
+  GdkWin32GLContextWGL *context_wgl;
+
+  if (!wglMakeCurrent (hdc, hglrc_legacy))
+    return FALSE;
+
+  if (share != NULL)
+    {
+      context_wgl = GDK_WIN32_GL_CONTEXT_WGL (share);
+
+      return wglShareLists (hglrc_legacy, context_wgl->wgl_context);
+    }
+
+  return TRUE;
+}
+
+static HGLRC
+create_wgl_context_with_attribs (HDC           hdc,
+                                 HGLRC         hglrc_base,
+                                 GdkGLContext *share,
+                                 int           flags,
+                                 int           major,
+                                 int           minor,
+                                 gboolean     *is_legacy)
+{
+  HGLRC hglrc;
+  GdkWin32GLContextWGL *context_wgl;
+
+  /* if we have wglCreateContextAttribsARB(), create a
+  * context with the compatibility profile if a legacy
+  * context is requested, or when we go into fallback mode
+  */
+  int profile = *is_legacy ? WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB :
+                             WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
+
+  int attribs[] = {
+    WGL_CONTEXT_PROFILE_MASK_ARB,   profile,
+    WGL_CONTEXT_MAJOR_VERSION_ARB, *is_legacy ? 3 : major,
+    WGL_CONTEXT_MINOR_VERSION_ARB, *is_legacy ? 0 : minor,
+    WGL_CONTEXT_FLAGS_ARB,          flags,
+    0
+  };
+
+  if (share != NULL)
+    context_wgl = GDK_WIN32_GL_CONTEXT_WGL (share);
+
+  hglrc = wglCreateContextAttribsARB (hdc,
+                                      share != NULL ? context_wgl->wgl_context : NULL,
+                                      attribs);
+
+  return hglrc;
+}
+
+static HGLRC
+create_wgl_context (HDC           hdc,
+                    GdkGLContext *share,
+                    int           flags,
+                    int           major,
+                    int           minor,
+                    gboolean     *is_legacy,
+                    gboolean      hasWglARBCreateContext)
+{
+  /* We need a legacy context for *all* cases */
+  HGLRC hglrc_base = wglCreateContext (hdc);
+  gboolean success = TRUE;
+
+  /* Save up the HDC and HGLRC that we are currently using, to restore back to it when we are done here  */
+  HDC hdc_current = wglGetCurrentDC ();
+  HGLRC hglrc_current = wglGetCurrentContext ();
+
+  /* if we have no wglCreateContextAttribsARB(), return the legacy context when all is set */
+  if (*is_legacy && !hasWglARBCreateContext)
+    {
+      if (ensure_legacy_wgl_context (hdc, hglrc_base, share))
+        {
+          wglMakeCurrent (hdc_current, hglrc_current);
+          return hglrc_base;
+        }
+
+      success = FALSE;
+      goto gl_fail;
+    }
+  else
+    {
+      HGLRC hglrc = NULL;
+
+      if (!wglMakeCurrent (hdc, hglrc_base))
+        {
+          success = FALSE;
+          goto gl_fail;
+        }
+
+      /*
+       * We need a Core GL 4.1 context in order to use the GL support in
+       * the GStreamer media widget backend, but wglCreateContextAttribsARB()
+       * may only give us the GL context version that we ask for here, and
+       * nothing more.  So, if we are asking for a pre-GL 4.1 context,
+       * try to ask for a 4.1 context explicitly first.  If that is not supported,
+       * then we fall back to whatever version that we were asking for (or, even a
+       * legacy context if that fails), at a price of not able to have GL support
+       * for the media GStreamer backend.
+       */
+      if (major < 4 || (major == 4 && minor < 1))
+        hglrc = create_wgl_context_with_attribs (hdc,
+                                                 hglrc_base,
+                                                 share,
+                                                 flags,
+                                                 4,
+                                                 1,
+                                                 is_legacy);
+
+      if (hglrc == NULL)
+        hglrc = create_wgl_context_with_attribs (hdc,
+                                                 hglrc_base,
+                                                 share,
+                                                 flags,
+                                                 major,
+                                                 minor,
+                                                 is_legacy);
+
+      /* return the legacy context we have if it could be setup properly, in case the 3.0+ context creation failed */
+      if (hglrc == NULL)
+        {
+          if (!(*is_legacy))
+            {
+              /* If we aren't using a legacy context in the beginning, try again with a compatibility profile 3.0 context */
+              hglrc = create_wgl_context_with_attribs (hdc,
+                                                       hglrc_base,
+                                                       share,
+                                                       flags,
+                                                       0, 0,
+                                                       is_legacy);
+
+              *is_legacy = TRUE;
+            }
+
+          if (hglrc == NULL)
+            {
+              if (!ensure_legacy_wgl_context (hdc, hglrc_base, share))
+                success = FALSE;
+            }
+
+          if (success)
+            GDK_NOTE (OPENGL, g_print ("Using legacy context as fallback\n"));
+        }
+
+gl_fail:
+
+      if (!success)
+        {
+          wglMakeCurrent (NULL, NULL);
+          wglDeleteContext (hglrc_base);
+          return NULL;
+        }
+
+      wglMakeCurrent (hdc_current, hglrc_current);
+
+      if (hglrc != NULL)
+        {
+          wglDeleteContext (hglrc_base);
+          return hglrc;
+        }
+
+      return hglrc_base;
+  }
+}
+
+static gboolean
+set_wgl_pixformat_for_hdc (HDC              hdc,
+                           int             *best_idx,
+                           GdkWin32Display *display_win32)
+{
+  gboolean already_checked = TRUE;
+  *best_idx = GetPixelFormat (hdc);
+
+  /* one is only allowed to call SetPixelFormat(), and so ChoosePixelFormat()
+   * one single time per window HDC
+   */
+  if (*best_idx == 0)
+    {
+      PIXELFORMATDESCRIPTOR pfd;
+      gboolean set_pixel_format_result = FALSE;
+
+      GDK_NOTE (OPENGL, g_print ("requesting pixel format...\n"));
+	  already_checked = FALSE;
+      *best_idx = get_wgl_pfd (hdc, &pfd, display_win32);
+
+      if (*best_idx != 0)
+        set_pixel_format_result = SetPixelFormat (hdc, *best_idx, &pfd);
+
+      /* ChoosePixelFormat() or SetPixelFormat() failed, bail out */
+      if (*best_idx == 0 || !set_pixel_format_result)
+        return FALSE;
+    }
+
+  GDK_NOTE (OPENGL, g_print ("%s""requested and set pixel format: %d\n", already_checked ? "already " : "", *best_idx));
+
+  return TRUE;
+}
+
+static gboolean
+gdk_win32_gl_context_wgl_realize (GdkGLContext *context,
+                                  GError **error)
+{
+  GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (context);
+
+  gboolean debug_bit, compat_bit, legacy_bit;
+
+  /* request flags and specific versions for core (3.2+) WGL context */
+  int flags = 0;
+  int major = 0;
+  int minor = 0;
+  HGLRC hglrc;
+  int pixel_format;
+  HDC hdc;
+  HWND hwnd;
+
+  GdkSurface *surface = gdk_gl_context_get_surface (context);
+  GdkDisplay *display = gdk_gl_context_get_display (context);
+  GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
+  GdkGLContext *share = gdk_display_get_gl_context (display);
+
+  gdk_gl_context_get_required_version (context, &major, &minor);
+  debug_bit = gdk_gl_context_get_debug_enabled (context);
+  compat_bit = gdk_gl_context_get_forward_compatible (context);
+
+  if (surface != NULL)
+    hdc = GDK_WIN32_SURFACE (surface)->hdc;
+  else
+    hdc = display_win32->dummy_context_wgl.hdc;
+
+  /*
+   * A legacy context cannot be shared with core profile ones, so this means we
+   * must stick to a legacy context if the shared context is a legacy context
+   */
+  legacy_bit = GDK_DISPLAY_DEBUG_CHECK (display, GL_LEGACY) ?
+               TRUE :
+			   share != NULL && gdk_gl_context_is_legacy (share);
+
+  if (!set_wgl_pixformat_for_hdc (hdc,
+                                 &pixel_format,
+                                  display_win32))
+    {
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_UNSUPPORTED_FORMAT,
+                           _("No available configurations for the given pixel format"));
+
+      return FALSE;
+    }
+
+  /* if there isn't wglCreateContextAttribsARB() on WGL, use a legacy context */
+  if (!legacy_bit)
+    legacy_bit = !display_win32->hasWglARBCreateContext;
+  if (debug_bit)
+    flags |= WGL_CONTEXT_DEBUG_BIT_ARB;
+  if (compat_bit)
+    flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
+
+  GDK_NOTE (OPENGL,
+            g_print ("Creating %s WGL context (version:%d.%d, debug:%s, forward:%s, legacy: %s)\n",
+                      compat_bit ? "core" : "compat",
+                      major,
+                      minor,
+                      debug_bit ? "yes" : "no",
+                      compat_bit ? "yes" : "no",
+                      legacy_bit ? "yes" : "no"));
+
+  hglrc = create_wgl_context (hdc,
+                              share,
+                              flags,
+                              major,
+                              minor,
+                             &legacy_bit,
+                              display_win32->hasWglARBCreateContext);
+
+  if (hglrc == NULL)
+    {
+      g_set_error_literal (error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_NOT_AVAILABLE,
+                           _("Unable to create a GL context"));
+      return FALSE;
+    }
+
+  GDK_NOTE (OPENGL,
+            g_print ("Created WGL context[%p], pixel_format=%d\n",
+                     hglrc,
+                     pixel_format));
+
+  context_wgl->wgl_context = hglrc;
+
+  /* No GLES, WGL does not support using EGL contexts */
+  gdk_gl_context_set_use_es (context, FALSE);
+
+  /* Ensure that any other context is created with a legacy bit set */
+  gdk_gl_context_set_is_legacy (context, legacy_bit);
+
+  return TRUE;
+}
+
+static gboolean
+gdk_win32_gl_context_wgl_clear_current (GdkGLContext *context)
+{
+  return wglMakeCurrent (NULL, NULL);
+}
+
+static gboolean
+gdk_win32_gl_context_wgl_make_current (GdkGLContext *context,
+                                       gboolean      surfaceless)
+{
+  GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (context);
+  GdkDisplay *display = gdk_gl_context_get_display (context);
+  GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
+  GdkSurface *surface = gdk_gl_context_get_surface (context);
+  HDC hdc;
+
+  if (surfaceless || surface == NULL)
+    hdc = display_win32->dummy_context_wgl.hdc;
+  else
+    hdc = GDK_WIN32_SURFACE (surface)->hdc;
+
+  if (!wglMakeCurrent (hdc, context_wgl->wgl_context))
+    return FALSE;
+
+  if (!surfaceless && display_win32->hasWglEXTSwapControl)
+    {
+      gboolean do_frame_sync = FALSE;
+
+      /* If there is compositing there is no particular need to delay
+       * the swap when drawing on the offscreen, rendering to the screen
+       * happens later anyway, and its up to the compositor to sync that
+       * to the vblank. */
+      do_frame_sync = ! gdk_display_is_composited (display);
+
+      if (do_frame_sync != context_wgl->do_frame_sync)
+        {
+          context_wgl->do_frame_sync = do_frame_sync;
+
+          wglSwapIntervalEXT (do_frame_sync ? 1 : 0);
+        }
+    }
+
+  return TRUE;
+}
+
+static void
+gdk_win32_gl_context_wgl_class_init (GdkWin32GLContextWGLClass *klass)
+{
+  GdkGLContextClass *context_class = GDK_GL_CONTEXT_CLASS (klass);
+  GdkDrawContextClass *draw_context_class = GDK_DRAW_CONTEXT_CLASS (klass);
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+  context_class->realize = gdk_win32_gl_context_wgl_realize;
+  context_class->make_current = gdk_win32_gl_context_wgl_make_current;
+  context_class->clear_current = gdk_win32_gl_context_wgl_clear_current;
+
+  draw_context_class->begin_frame = gdk_win32_gl_context_wgl_begin_frame;
+  draw_context_class->end_frame = gdk_win32_gl_context_wgl_end_frame;
+  gobject_class->dispose = gdk_win32_gl_context_wgl_dispose;
+}
+
+static void
+gdk_win32_gl_context_wgl_init (GdkWin32GLContextWGL *wgl_context)
+{
+}
+
+
+/**
+ * gdk_win32_display_get_wgl_version:
+ * @display: a `GdkDisplay`
+ * @major: (out): return location for the WGL major version
+ * @minor: (out): return location for the WGL minor version
+ *
+ * Retrieves the version of the WGL implementation.
+ *
+ * Returns: %TRUE if WGL is available
+ */
+gboolean
+gdk_win32_display_get_wgl_version (GdkDisplay *display,
+                                   int *major,
+                                   int *minor)
+{
+  GdkWin32Display *display_win32;
+  g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
+
+  if (!GDK_IS_WIN32_DISPLAY (display))
+    return FALSE;
+
+  display_win32 = GDK_WIN32_DISPLAY (display);
+  if (display_win32->wgl_pixel_format == 0)
+    return FALSE;
+
+  if (major != NULL)
+    *major = display_win32->gl_version / 10;
+  if (minor != NULL)
+    *minor = display_win32->gl_version % 10;
+
+  return TRUE;
+}

gdk/win32/gdkglcontext-win32.h

@@ -35,24 +35,13 @@
 
 G_BEGIN_DECLS
 
+#define GDK_WIN32_GL_CONTEXT_CLASS(klass)         (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_WIN32_GL_CONTEXT, GdkWin32GLContextClass))
+#define GDK_WIN32_GL_CONTEXT_GET_CLASS(obj)       (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_WIN32_GL_CONTEXT, GdkWin32GLContextClass))
+#define GDK_WIN32_IS_GL_CONTEXT_CLASS(klass)      (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_WIN32_GL_CONTEXT))
+
 struct _GdkWin32GLContext
 {
   GdkGLContext parent_instance;
-
-  /* WGL Context Items */
-  HGLRC hglrc;
-  HDC gl_hdc;
-  guint need_alpha_bits : 1;
-
-  /* other items */
-  guint is_attached : 1;
-  guint do_frame_sync : 1;
-
-#ifdef GDK_WIN32_ENABLE_EGL
-  /* EGL (Angle) Context Items */
-  EGLContext egl_context;
-  EGLConfig egl_config;
-#endif
 };
 
 struct _GdkWin32GLContextClass
@@ -60,15 +49,33 @@ struct _GdkWin32GLContextClass
   GdkGLContextClass parent_class;
 };
 
-GdkGLContext *
-_gdk_win32_surface_create_gl_context (GdkSurface *window,
-                                     gboolean attached,
-                                     GdkGLContext *share,
-                                     GError **error);
+/* WGL */
+#define GDK_TYPE_WIN32_GL_CONTEXT_WGL     (gdk_win32_gl_context_wgl_get_type())
+#define GDK_WIN32_GL_CONTEXT_WGL(obj)     (G_TYPE_CHECK_INSTANCE_CAST ((obj), GDK_TYPE_WIN32_GL_CONTEXT_WGL, GdkWin32GLContextWGL))
+#define GDK_IS_WIN32_GL_CONTEXT_WGL(obj)  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GDK_TYPE_WIN32_GL_CONTEXT_WGL))
+
+typedef struct _GdkWin32GLContextWGL      GdkWin32GLContextWGL;
+
+gboolean  gdk_win32_display_init_wgl                (GdkDisplay *display,
+                                                     GError    **error);
+void      gdk_win32_gl_context_wgl_bind_surface     (GdkWin32GLContextWGL *ctx,
+                                                     GdkWin32Surface      *win32_surface);
+
+GType     gdk_win32_gl_context_wgl_get_type         (void) G_GNUC_CONST;
+
+/* EGL */
+#define GDK_TYPE_WIN32_GL_CONTEXT_EGL     (gdk_win32_gl_context_egl_get_type())
+#define GDK_WIN32_GL_CONTEXT_EGL(obj)     (G_TYPE_CHECK_INSTANCE_CAST ((obj), GDK_TYPE_WIN32_GL_CONTEXT_EGL, GdkWin32GLContextEGL))
+#define GDK_IS_WIN32_GL_CONTEXT_EGL(obj)  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GDK_TYPE_WIN32_GL_CONTEXT_EGL))
+
+typedef struct _GdkWin32GLContextEGL      GdkWin32GLContextEGL;
+
+gboolean  gdk_win32_display_init_egl                (GdkDisplay  *display,
+                                                     GError     **error);
+void      gdk_win32_surface_destroy_egl_surface     (GdkWin32Surface *self);
+
+GType     gdk_win32_gl_context_egl_get_type         (void) G_GNUC_CONST;
 
-gboolean
-_gdk_win32_display_make_gl_context_current (GdkDisplay *display,
-                                            GdkGLContext *context);
 void
 _gdk_win32_surface_invalidate_egl_framebuffer (GdkSurface *surface);
 

gdk/win32/gdkkeys-win32.c

@@ -694,6 +694,7 @@ update_keymap (GdkKeymap *gdk_keymap)
   if (hkls_len != keymap->layout_handles->len)
     keymap->keysym_tab = g_renew (guint, keymap->keysym_tab, keysym_tab_size);
 
+  memset (key_state, 0, sizeof(key_state));
   memset (keymap->keysym_tab, 0, keysym_tab_size);
   g_array_set_size (keymap->layout_handles, hkls_len);
   g_array_set_size (keymap->options, hkls_len);

gdk/win32/gdkmonitor-win32.c

@@ -681,7 +681,7 @@ enum_monitor (HMONITOR hmonitor,
           else
             {
               /* First acquire the scale using the current screen */
-              scale = _gdk_win32_display_get_monitor_scale_factor (data->display, NULL, NULL, NULL);
+              scale = gdk_win32_display_get_monitor_scale_factor (data->display, NULL, NULL);
 
               /* acquire the scale using the monitor which the window is nearest on Windows 8.1+ */
               if (data->display->have_at_least_win81)
@@ -695,7 +695,7 @@ enum_monitor (HMONITOR hmonitor,
                   pt.x = w32mon->work_rect.x + w32mon->work_rect.width / 2;
                   pt.y = w32mon->work_rect.y + w32mon->work_rect.height / 2;
                   hmonitor = MonitorFromPoint (pt, MONITOR_DEFAULTTONEAREST);
-                  scale = _gdk_win32_display_get_monitor_scale_factor (data->display, hmonitor, NULL, NULL);
+                  scale = gdk_win32_display_get_monitor_scale_factor (data->display, NULL, hmonitor);
                 }
             }
 

gdk/win32/gdkscreen-win32.c

@@ -78,8 +78,7 @@ init_root_window (GdkWin32Screen *screen_win32)
   win32_display = GDK_WIN32_DISPLAY (_gdk_display);
 
   if (win32_display->dpi_aware_type != PROCESS_DPI_UNAWARE)
-    screen_win32->surface_scale = _gdk_win32_display_get_monitor_scale_factor (win32_display,
-                                                                              NULL,
+    screen_win32->surface_scale = gdk_win32_display_get_monitor_scale_factor (win32_display,
                                                                               NULL,
                                                                               NULL);
   else

gdk/win32/gdksurface-win32.c

@@ -352,12 +352,14 @@ RegisterGdkClass (GdkSurfaceType wtype)
     {
       char sLoc [MAX_PATH+1];
 
-      if (0 != GetModuleFileName (_gdk_dll_hinstance, sLoc, MAX_PATH))
+      // try to load first icon of executable program
+      if (0 != GetModuleFileName (NULL, sLoc, MAX_PATH))
         {
           ExtractIconEx (sLoc, 0, &hAppIcon, &hAppIconSm, 1);
 
           if (0 == hAppIcon && 0 == hAppIconSm)
             {
+              // fallback : load icon from GTK DLL
               if (0 != GetModuleFileName (_gdk_dll_hinstance, sLoc, MAX_PATH))
 		{
 		  ExtractIconEx (sLoc, 0, &hAppIcon, &hAppIconSm, 1);
@@ -395,12 +397,13 @@ RegisterGdkClass (GdkSurfaceType wtype)
   wcl.hbrBackground = NULL; \
   wcl.hCursor = LoadCursor (NULL, IDC_ARROW);
 
+  /* MSDN: CS_OWNDC is needed for OpenGL contexts */
+  wcl.style |= CS_OWNDC;
+
   switch (wtype)
     {
     case GDK_SURFACE_TOPLEVEL:
     case GDK_SURFACE_POPUP:
-      /* MSDN: CS_OWNDC is needed for OpenGL contexts */
-      wcl.style |= CS_OWNDC;
       if (0 == klassTOPLEVEL)
         {
           wcl.lpszClassName = L"gdkSurfaceToplevel";
@@ -519,7 +522,7 @@ _gdk_win32_display_create_surface (GdkDisplay     *display,
   surface->width = width;
   surface->height = height;
 
-  impl->surface_scale = _gdk_win32_display_get_monitor_scale_factor (display_win32, NULL, NULL, NULL);
+  impl->surface_scale = gdk_win32_display_get_monitor_scale_factor (display_win32, NULL, NULL);
 
   dwExStyle = 0;
   owner = NULL;
@@ -652,6 +655,7 @@ _gdk_win32_display_create_surface (GdkDisplay     *display,
                     impl);
 
   g_object_unref (frame_clock);
+  impl->hdc = GetDC (impl->handle);
 
   return surface;
 }
@@ -1227,6 +1231,7 @@ gdk_win32_surface_layout_popup (GdkSurface     *surface,
                                      &shadow_right,
                                      &shadow_top,
                                      &shadow_bottom);
+
   gdk_win32_surface_set_shadow_width (surface,
                                       shadow_left,
                                       shadow_right,
@@ -1236,10 +1241,10 @@ gdk_win32_surface_layout_popup (GdkSurface     *surface,
   gdk_surface_layout_popup_helper (surface,
                                    width,
                                    height,
-                                   impl->shadow.left,
-                                   impl->shadow.right,
-                                   impl->shadow.top,
-                                   impl->shadow.bottom,
+                                   shadow_left,
+                                   shadow_right,
+                                   shadow_top,
+                                   shadow_bottom,
                                    monitor,
                                    &bounds,
                                    layout,
@@ -1259,9 +1264,7 @@ gdk_win32_surface_layout_popup (GdkSurface     *surface,
                                      final_rect.height);
     }
   else
-    {
-      gdk_win32_surface_move (surface, x, y);
-    }
+    gdk_win32_surface_move (surface, x, y);
 }
 
 static void
@@ -4415,9 +4418,9 @@ gdk_win32_surface_set_shadow_width (GdkSurface *window,
   if (impl->zero_shadow)
     return;
 
-  impl->shadow.left = left;
+  impl->shadow.left = left * impl->surface_scale;;
   impl->shadow.right = right * impl->surface_scale;
-  impl->shadow.top = top;
+  impl->shadow.top = top * impl->surface_scale;;
   impl->shadow.bottom = bottom * impl->surface_scale;
   impl->shadow_x = left + right;
   impl->shadow_y = top + bottom;
@@ -4425,19 +4428,19 @@ gdk_win32_surface_set_shadow_width (GdkSurface *window,
 
 
 int
-_gdk_win32_surface_get_scale_factor (GdkSurface *window)
+_gdk_win32_surface_get_scale_factor (GdkSurface *surface)
 {
   GdkDisplay *display;
   GdkWin32Surface *impl;
   GdkWin32Display *win32_display;
 
-  if (GDK_SURFACE_DESTROYED (window))
+  if (GDK_SURFACE_DESTROYED (surface))
     return 1;
 
-  g_return_val_if_fail (window != NULL, 1);
+  g_return_val_if_fail (surface != NULL, 1);
 
-  display = gdk_surface_get_display (window);
-  impl = GDK_WIN32_SURFACE (window);
+  display = gdk_surface_get_display (surface);
+  impl = GDK_WIN32_SURFACE (surface);
 
   win32_display = GDK_WIN32_DISPLAY (display);
 
@@ -4446,9 +4449,8 @@ _gdk_win32_surface_get_scale_factor (GdkSurface *window)
       if (win32_display->has_fixed_scale)
         impl->surface_scale = win32_display->surface_scale;
       else
-        impl->surface_scale = _gdk_win32_display_get_monitor_scale_factor (win32_display,
-                                                                          NULL,
-                                                                          GDK_SURFACE_HWND (window),
+        impl->surface_scale = gdk_win32_display_get_monitor_scale_factor (win32_display,
+                                                                          surface,
                                                                           NULL);
 
       return impl->surface_scale;
@@ -4553,7 +4555,7 @@ _gdk_win32_surface_request_layout (GdkSurface *surface)
   int scale = impl->surface_scale;
   RECT rect;
 
-  if (GDK_IS_TOPLEVEL (surface) && impl->drag_move_resize_context.native_move_resize_pending)
+  if (impl->drag_move_resize_context.native_move_resize_pending)
     {
       surface->width = impl->next_layout.configured_width;
       surface->height = impl->next_layout.configured_height;
@@ -4564,8 +4566,18 @@ _gdk_win32_surface_request_layout (GdkSurface *surface)
 
       impl->next_layout.configured_width = (rect.right - rect.left + scale - 1) / scale;
       impl->next_layout.configured_height = (rect.bottom - rect.top + scale - 1) / scale;
-      surface->x = rect.left / scale;
-      surface->y = rect.top / scale;
+
+      if (GDK_IS_TOPLEVEL (surface))
+        {
+          surface->x = rect.left / scale;
+          surface->y = rect.top / scale;
+        }
+      else if (GDK_IS_POPUP (surface))
+        {
+          gdk_win32_surface_get_geometry (surface,
+                                         &surface->x, &surface->y,
+                                          NULL, NULL);
+        }
     }
 }
 
@@ -4612,7 +4624,6 @@ gdk_win32_surface_class_init (GdkWin32SurfaceClass *klass)
 
   impl_class->destroy_notify = gdk_win32_surface_destroy_notify;
   impl_class->drag_begin = _gdk_win32_surface_drag_begin;
-  impl_class->create_gl_context = _gdk_win32_surface_create_gl_context;
   impl_class->get_scale_factor = _gdk_win32_surface_get_scale_factor;
   impl_class->request_layout = _gdk_win32_surface_request_layout;
   impl_class->compute_size = _gdk_win32_surface_compute_size;
@@ -4655,9 +4666,9 @@ gdk_win32_popup_init (GdkWin32Popup *popup)
 
 static void
 gdk_win32_popup_get_property (GObject    *object,
-                                guint       prop_id,
-                                GValue     *value,
-                                GParamSpec *pspec)
+                              guint       prop_id,
+                              GValue     *value,
+                              GParamSpec *pspec)
 {
   GdkSurface *surface = GDK_SURFACE (object);
 
@@ -4679,9 +4690,9 @@ gdk_win32_popup_get_property (GObject    *object,
 
 static void
 gdk_win32_popup_set_property (GObject      *object,
-                                guint         prop_id,
-                                const GValue *value,
-                                GParamSpec   *pspec)
+                              guint         prop_id,
+                              const GValue *value,
+                              GParamSpec   *pspec)
 {
   GdkSurface *surface = GDK_SURFACE (object);
 
@@ -4716,9 +4727,9 @@ gdk_win32_popup_class_init (GdkWin32PopupClass *class)
 
 static gboolean
 gdk_win32_popup_present (GdkPopup       *popup,
-                           int             width,
-                           int             height,
-                           GdkPopupLayout *layout)
+                         int             width,
+                         int             height,
+                         GdkPopupLayout *layout)
 {
   return gdk_win32_surface_present_popup (GDK_SURFACE (popup), width, height, layout);
 }
@@ -5034,9 +5045,9 @@ gdk_win32_drag_surface_iface_init (GdkDragSurfaceInterface *iface)
 
 #ifdef GDK_WIN32_ENABLE_EGL
 EGLSurface
-_gdk_win32_surface_get_egl_surface (GdkSurface *surface,
-                                    EGLConfig   config,
-                                    gboolean    is_dummy)
+gdk_win32_surface_get_egl_surface (GdkSurface *surface,
+                                   EGLConfig   config,
+                                   gboolean    is_dummy)
 {
   GdkWin32Display *display = GDK_WIN32_DISPLAY (gdk_surface_get_display (surface));
   GdkWin32Surface *impl = GDK_WIN32_SURFACE (surface);
@@ -5055,7 +5066,10 @@ _gdk_win32_surface_get_egl_surface (GdkSurface *surface,
   else
     {
       if (impl->egl_surface == EGL_NO_SURFACE)
-        impl->egl_surface = eglCreateWindowSurface (display->egl_disp, config, display->gl_hwnd, NULL);
+        impl->egl_surface = eglCreateWindowSurface (display->egl_disp,
+                                                    config,
+                                                    GDK_SURFACE_HWND (surface),
+                                                    NULL);
 
       return impl->egl_surface;
     }
@@ -5138,3 +5152,20 @@ gdk_win32_surface_handle_queued_move_resize (GdkDrawContext *draw_context)
 
   return queued_window_rect;
 }
+
+void
+_gdk_win32_surface_invalidate_egl_framebuffer (GdkSurface *surface)
+{
+/* If we are using ANGLE, we need to force redraw of the whole Window and its child windows
+ *  as we need to re-acquire the EGL surfaces that we rendered to upload to Cairo explicitly,
+ *  using gdk_window_invalidate_rect (), when we maximize or restore or use aerosnap
+ */
+#ifdef GDK_WIN32_ENABLE_EGL
+  if (surface->gl_paint_context != NULL && gdk_gl_context_get_use_es (surface->gl_paint_context))
+    {
+      GdkWin32Surface *impl = GDK_WIN32_SURFACE (surface);
+
+      impl->egl_force_redraw_all = TRUE;
+    }
+#endif
+}

gdk/win32/gdksurface-win32.h

@@ -379,9 +379,9 @@ RECT
 gdk_win32_surface_handle_queued_move_resize (GdkDrawContext *draw_context);
 
 #ifdef GDK_WIN32_ENABLE_EGL
-EGLSurface _gdk_win32_surface_get_egl_surface (GdkSurface *surface,
-                                               EGLConfig   config,
-                                               gboolean    is_dummy);
+EGLSurface gdk_win32_surface_get_egl_surface (GdkSurface *surface,
+                                              EGLConfig   config,
+                                              gboolean    is_dummy);
 #endif
 
 G_END_DECLS