Main Workspace Integration

This commit does the main integration of workspaces, which is a design we agreed on during the 2.8 UI workshop (see https://wiki.blender.org/index.php/Dev:2.8/UI/Workshop_Writeup)

Workspaces should generally be stable, I'm not aware of any remaining bugs (or I've forgotten them :) ). If you find any, let me know!
(Exception: mode switching button might get out of sync with actual mode in some cases, would consider that a limitation/ToDo. Needs to be resolved at some point.)

== Main Changes/Features
* Introduces the new Workspaces as data-blocks.
* Allow storing a number of custom workspaces as part of the user configuration. Needs further work to allow adding and deleting individual workspaces.
* Bundle a default workspace configuration with Blender (current screen-layouts converted to workspaces).
* Pressing button to add a workspace spawns a menu to select between "Duplicate Current" and the workspaces from the user configuration. If no workspaces are stored in the user configuration, the default workspaces are listed instead.
* Store screen-layouts (`bScreen`) per workspace.
* Store an active screen-layout per workspace. Changing the workspace will enable this layout.
* Store active mode in workspace. Changing the workspace will also enter the mode of the new workspace. (Note that we still store the active mode in the object, moving this completely to workspaces is a separate project.)
* Store an active render layer per workspace.
* Moved mode switch from 3D View header to Info Editor header.
* Store active scene in window (not directly workspace related, but overlaps quite a bit).
* Removed 'Use Global Scene' User Preference option.
* Compatibility with old files - a new workspace is created for every screen-layout of old files. Old Blender versions should be able to read files saved with workspace support as well.
* Default .blend only contains one workspace ("General").
* Support appending workspaces.

Opening files without UI and commandline rendering should work fine.

Note that the UI is temporary! We plan to introduce a new global topbar
that contains the workspace options and tabs for switching workspaces.

== Technical Notes
* Workspaces are data-blocks.
* Adding and removing `bScreen`s should be done through `ED_workspace_layout` API now.
* A workspace can be active in multiple windows at the same time.
* The mode menu (which is now in the Info Editor header) doesn't display "Grease Pencil Edit" mode anymore since its availability depends on the active editor. Will be fixed by making Grease Pencil an own object type (as planned).
* The button to change the active workspace object mode may get out of sync with the mode of the active object. Will either be resolved by moving mode out of object data, or we'll disable workspace modes again (there's a `#define USE_WORKSPACE_MODE` for that).
* Screen-layouts (`bScreen`) are IDs and thus stored in a main list-base. Had to add a wrapper `WorkSpaceLayout` so we can store them in a list-base within workspaces, too. On the long run we could completely replace `bScreen` by workspace structs.
* `WorkSpace` types use some special compiler trickery to allow marking structs and struct members as private. BKE_workspace API should be used for accessing those.
* Added scene operators `SCENE_OT_`. Was previously done through screen operators.

== BPY API Changes
* Removed `Screen.scene`, added `Window.scene`
* Removed `UserPreferencesView.use_global_scene`
* Added `Context.workspace`, `Window.workspace` and `BlendData.workspaces`
* Added `bpy.types.WorkSpace` containing `screens`, `object_mode` and `render_layer`
* Added Screen.layout_name for the layout name that'll be displayed in the UI (may differ from internal name)

== What's left?
* There are a few open design questions (T50521). We should find the needed answers and implement them.
* Allow adding and removing individual workspaces from workspace configuration (needs UI design).
* Get the override system ready and support overrides per workspace.
* Support custom UI setups as part of workspaces (hidden panels, hidden buttons, customizable toolbars, etc).
* Allow enabling add-ons per workspace.
* Support custom workspace keymaps.
* Remove special exception for workspaces in linking code (so they're always appended, never linked). Depends on a few things, so best to solve later.
* Get the topbar done.
* Workspaces need a proper icon, current one is just a placeholder :)

Reviewed By: campbellbarton, mont29

Tags: #user_interface, #bf_blender_2.8

Maniphest Tasks: T50521

Differential Revision: https://developer.blender.org/D2451

14 files changed, 408 insertions, 97 deletions

diff --git a/source/blender/makesrna/intern/CMakeLists.txt b/source/blender/makesrna/intern/CMakeLists.txt
index 020c3a755c1..899c9bf77a9 100644
--- a/source/blender/makesrna/intern/CMakeLists.txt
+++ b/source/blender/makesrna/intern/CMakeLists.txt
@@ -94,6 +94,7 @@ set(DEFSRC
 	rna_userdef.c
 	rna_vfont.c
 	rna_wm.c
+	rna_workspace.c
 	rna_world.c
 )
 
diff --git a/source/blender/makesrna/intern/makesrna.c b/source/blender/makesrna/intern/makesrna.c
index de436172bfd..bac221f96ab 100644
--- a/source/blender/makesrna/intern/makesrna.c
+++ b/source/blender/makesrna/intern/makesrna.c
@@ -3364,6 +3364,7 @@ static RNAProcessItem PROCESS_ITEMS[] = {
 	{"rna_userdef.c", NULL, RNA_def_userdef},
 	{"rna_vfont.c", "rna_vfont_api.c", RNA_def_vfont},
 	{"rna_wm.c", "rna_wm_api.c", RNA_def_wm},
+	{"rna_workspace.c", NULL, RNA_def_workspace},
 	{"rna_world.c", NULL, RNA_def_world},
 	{"rna_movieclip.c", NULL, RNA_def_movieclip},
 	{"rna_tracking.c", NULL, RNA_def_tracking},
diff --git a/source/blender/makesrna/intern/rna_ID.c b/source/blender/makesrna/intern/rna_ID.c
index 4291e5b63ae..f36c8d0cc0d 100644
--- a/source/blender/makesrna/intern/rna_ID.c
+++ b/source/blender/makesrna/intern/rna_ID.c
@@ -82,6 +82,7 @@ EnumPropertyItem rna_enum_id_type_items[] = {
 	{ID_TE, "TEXTURE", ICON_TEXTURE_DATA, "Texture", ""},
 	{ID_WM, "WINDOWMANAGER", ICON_FULLSCREEN, "Window Manager", ""},
 	{ID_WO, "WORLD", ICON_WORLD_DATA, "World", ""},
+	{ID_WS, "WORKSPACE", ICON_NONE, "Workspace", ""},
 	{0, NULL, 0, NULL, NULL}
 };
 
@@ -169,6 +170,7 @@ short RNA_type_to_ID_code(const StructRNA *type)
 	if (RNA_struct_is_a(type, &RNA_Texture)) return ID_TE;
 	if (RNA_struct_is_a(type, &RNA_Text)) return ID_TXT;
 	if (RNA_struct_is_a(type, &RNA_VectorFont)) return ID_VF;
+	if (RNA_struct_is_a(type, &RNA_WorkSpace)) return ID_WS;
 	if (RNA_struct_is_a(type, &RNA_World)) return ID_WO;
 	if (RNA_struct_is_a(type, &RNA_WindowManager)) return ID_WM;
 
@@ -211,6 +213,7 @@ StructRNA *ID_code_to_RNA_type(short idcode)
 		case ID_VF: return &RNA_VectorFont;
 		case ID_WM: return &RNA_WindowManager;
 		case ID_WO: return &RNA_World;
+		case ID_WS: return &RNA_WorkSpace;
 
 		default: return &RNA_ID;
 	}
diff --git a/source/blender/makesrna/intern/rna_context.c b/source/blender/makesrna/intern/rna_context.c
index 360bd5691cd..a0b46a447ae 100644
--- a/source/blender/makesrna/intern/rna_context.c
+++ b/source/blender/makesrna/intern/rna_context.c
@@ -51,6 +51,12 @@ static PointerRNA rna_Context_window_get(PointerRNA *ptr)
 	return rna_pointer_inherit_refine(ptr, &RNA_Window, CTX_wm_window(C));
 }
 
+static PointerRNA rna_Context_workspace_get(PointerRNA *ptr)
+{
+	bContext *C = (bContext *)ptr->data;
+	return rna_pointer_inherit_refine(ptr, &RNA_WorkSpace, CTX_wm_workspace(C));
+}
+
 static PointerRNA rna_Context_screen_get(PointerRNA *ptr)
 {
 	bContext *C = (bContext *)ptr->data;
@@ -193,6 +199,11 @@ void RNA_def_context(BlenderRNA *brna)
 	RNA_def_property_struct_type(prop, "Window");
 	RNA_def_property_pointer_funcs(prop, "rna_Context_window_get", NULL, NULL, NULL);
 
+	prop = RNA_def_property(srna, "workspace", PROP_POINTER, PROP_NONE);
+	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+	RNA_def_property_struct_type(prop, "WorkSpace");
+	RNA_def_property_pointer_funcs(prop, "rna_Context_workspace_get", NULL, NULL, NULL);
+
 	prop = RNA_def_property(srna, "screen", PROP_POINTER, PROP_NONE);
 	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
 	RNA_def_property_struct_type(prop, "Screen");
diff --git a/source/blender/makesrna/intern/rna_internal.h b/source/blender/makesrna/intern/rna_internal.h
index 75fc9a17b07..878ee722c2d 100644
--- a/source/blender/makesrna/intern/rna_internal.h
+++ b/source/blender/makesrna/intern/rna_internal.h
@@ -186,6 +186,7 @@ void RNA_def_ui(struct BlenderRNA *brna);
 void RNA_def_userdef(struct BlenderRNA *brna);
 void RNA_def_vfont(struct BlenderRNA *brna);
 void RNA_def_wm(struct BlenderRNA *brna);
+void RNA_def_workspace(struct BlenderRNA *brna);
 void RNA_def_world(struct BlenderRNA *brna);
 void RNA_def_movieclip(struct BlenderRNA *brna);
 void RNA_def_tracking(struct BlenderRNA *brna);
@@ -335,6 +336,7 @@ void RNA_def_main_masks(BlenderRNA *brna, PropertyRNA *cprop);
 void RNA_def_main_linestyles(BlenderRNA *brna, PropertyRNA *cprop);
 void RNA_def_main_cachefiles(BlenderRNA *brna, PropertyRNA *cprop);
 void RNA_def_main_paintcurves(BlenderRNA *brna, PropertyRNA *cprop);
+void RNA_def_main_workspaces(BlenderRNA *brna, PropertyRNA *cprop);
 
 /* ID Properties */
 
diff --git a/source/blender/makesrna/intern/rna_main.c b/source/blender/makesrna/intern/rna_main.c
index 94687b6fd46..4f52ac97961 100644
--- a/source/blender/makesrna/intern/rna_main.c
+++ b/source/blender/makesrna/intern/rna_main.c
@@ -293,6 +293,12 @@ static void rna_Main_paintcurves_begin(CollectionPropertyIterator *iter, Pointer
 	rna_iterator_listbase_begin(iter, &bmain->paintcurves, NULL);
 }
 
+static void rna_Main_workspaces_begin(CollectionPropertyIterator *iter, PointerRNA *ptr)
+{
+	Main *bmain = (Main *)ptr->data;
+	rna_iterator_listbase_begin(iter, &bmain->workspaces, NULL);
+}
+
 static void rna_Main_version_get(PointerRNA *ptr, int *value)
 {
 	Main *bmain = (Main *)ptr->data;
@@ -368,6 +374,7 @@ void RNA_def_main(BlenderRNA *brna)
 		{"linestyles", "FreestyleLineStyle", "rna_Main_linestyle_begin", "Line Styles", "Line Style data-blocks", RNA_def_main_linestyles},
 		{"cache_files", "CacheFile", "rna_Main_cachefiles_begin", "Cache Files", "Cache Files data-blocks", RNA_def_main_cachefiles},
 		{"paint_curves", "PaintCurve", "rna_Main_paintcurves_begin", "Paint Curves", "Paint Curves data-blocks", RNA_def_main_paintcurves},
+		{"workspaces", "WorkSpace", "rna_Main_workspaces_begin", "Workspaces", "Workspace data-blocks", RNA_def_main_workspaces},
 		{NULL, NULL, NULL, NULL, NULL, NULL}
 	};
 
diff --git a/source/blender/makesrna/intern/rna_main_api.c b/source/blender/makesrna/intern/rna_main_api.c
index 244820f5a49..cd0fe461428 100644
--- a/source/blender/makesrna/intern/rna_main_api.c
+++ b/source/blender/makesrna/intern/rna_main_api.c
@@ -84,6 +84,7 @@
 #include "BKE_mask.h"
 #include "BKE_gpencil.h"
 #include "BKE_linestyle.h"
+#include "BKE_workspace.h"
 
 #include "DNA_armature_types.h"
 #include "DNA_camera_types.h"
@@ -115,6 +116,8 @@
 #  include "BPY_extern.h"
 #endif
 
+#include "WM_api.h"
+
 
 static void rna_idname_validate(const char *name, char *r_name)
 {
@@ -169,14 +172,15 @@ static void rna_Main_scenes_remove(Main *bmain, bContext *C, ReportList *reports
 	    (scene_new = scene->id.next))
 	{
 		if (do_unlink) {
-			bScreen *sc = CTX_wm_screen(C);
-			if (sc->scene == scene) {
+			wmWindow *win = CTX_wm_window(C);
+
+			if (WM_window_get_active_scene(win) == scene) {
 
 #ifdef WITH_PYTHON
 				BPy_BEGIN_ALLOW_THREADS;
 #endif
 
-				ED_screen_set_scene(C, sc, scene_new);
+				WM_window_change_active_scene(bmain, C, win, scene_new);
 
 #ifdef WITH_PYTHON
 				BPy_END_ALLOW_THREADS;
@@ -610,6 +614,7 @@ RNA_MAIN_ID_TAG_FUNCS_DEF(masks, mask, ID_MSK)
 RNA_MAIN_ID_TAG_FUNCS_DEF(linestyle, linestyle, ID_LS)
 RNA_MAIN_ID_TAG_FUNCS_DEF(cachefiles, cachefiles, ID_CF)
 RNA_MAIN_ID_TAG_FUNCS_DEF(paintcurves, paintcurves, ID_PC)
+RNA_MAIN_ID_TAG_FUNCS_DEF(workspaces, workspaces, ID_WS)
 
 #undef RNA_MAIN_ID_TAG_FUNCS_DEF
 
@@ -1819,4 +1824,25 @@ void RNA_def_main_linestyles(BlenderRNA *brna, PropertyRNA *cprop)
 	RNA_def_property_boolean_funcs(prop, "rna_Main_linestyle_is_updated_get", NULL);
 }
 
+void RNA_def_main_workspaces(BlenderRNA *brna, PropertyRNA *cprop)
+{
+	StructRNA *srna;
+	FunctionRNA *func;
+	PropertyRNA *parm;
+	PropertyRNA *prop;
+
+	RNA_def_property_srna(cprop, "BlendDataWorkSpaces");
+	srna = RNA_def_struct(brna, "BlendDataWorkSpaces", NULL);
+	RNA_def_struct_sdna(srna, "Main");
+	RNA_def_struct_ui_text(srna, "Main Workspaces", "Collection of workspaces");
+
+	func = RNA_def_function(srna, "tag", "rna_Main_workspaces_tag");
+	parm = RNA_def_boolean(func, "value", 0, "Value", "");
+	RNA_def_parameter_flags(parm, 0, PARM_REQUIRED);
+
+	prop = RNA_def_property(srna, "is_updated", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+	RNA_def_property_boolean_funcs(prop, "rna_Main_workspaces_is_updated_get", NULL);
+}
+
 #endif
diff --git a/source/blender/makesrna/intern/rna_scene.c b/source/blender/makesrna/intern/rna_scene.c
index 4ff2e03ef9c..266838153e9 100644
--- a/source/blender/makesrna/intern/rna_scene.c
+++ b/source/blender/makesrna/intern/rna_scene.c
@@ -763,19 +763,21 @@ static int rna_Scene_active_layer_get(PointerRNA *ptr)
 
 static void rna_Scene_view3d_update(Main *bmain, Scene *UNUSED(scene_unused), PointerRNA *ptr)
 {
+	wmWindowManager *wm = bmain->wm.first;
 	Scene *scene = (Scene *)ptr->data;
 
-	BKE_screen_view3d_main_sync(&bmain->screen, scene);
+	WM_windows_scene_data_sync(&wm->windows, scene);
 }
 
-static void rna_Scene_layer_update(Main *bmain, Scene *scene, PointerRNA *ptr)
+static void rna_Scene_layer_update(Main *bmain, Scene *UNUSED(scene), PointerRNA *UNUSED(ptr))
 {
-	rna_Scene_view3d_update(bmain, scene, ptr);
 	/* XXX We would need do_time=true here, else we can have update issues like [#36289]...
 	 *     However, this has too much drawbacks (like slower layer switch, undesired updates...).
 	 *     That's TODO for future DAG updates.
 	 */
 	DAG_on_visible_update(bmain, false);
+
+	/* No need to sync scene data here (WM_windows_scene_data_sync), handled through notifier. */
 }
 
 static void rna_Scene_fps_update(Main *UNUSED(bmain), Scene *scene, PointerRNA *UNUSED(ptr))
diff --git a/source/blender/makesrna/intern/rna_screen.c b/source/blender/makesrna/intern/rna_screen.c
index b44e404c364..a145ac95d6b 100644
--- a/source/blender/makesrna/intern/rna_screen.c
+++ b/source/blender/makesrna/intern/rna_screen.c
@@ -57,6 +57,7 @@ EnumPropertyItem rna_enum_region_type_items[] = {
 
 #include "BKE_global.h"
 #include "BKE_depsgraph.h"
+#include "BKE_workspace.h"
 
 #include "UI_view2d.h"
 
@@ -64,55 +65,58 @@ EnumPropertyItem rna_enum_region_type_items[] = {
 #  include "BPY_extern.h"
 #endif
 
-static void rna_Screen_scene_set(PointerRNA *ptr, PointerRNA value)
-{
-	bScreen *sc = (bScreen *)ptr->data;
 
-	if (value.data == NULL)
-		return;
+static void rna_Screen_redraw_update(Main *UNUSED(bmain), Scene *UNUSED(scene), PointerRNA *ptr)
+{
+	bScreen *screen = (bScreen *)ptr->data;
 
-	sc->newscene = value.data;
+	/* the settings for this are currently only available from a menu in the TimeLine, hence refresh=SPACE_TIME */
+	ED_screen_animation_timer_update(screen, screen->redraws_flag, SPACE_TIME);
 }
 
-static void rna_Screen_scene_update(bContext *C, PointerRNA *ptr)
+static int rna_Screen_is_animation_playing_get(PointerRNA *UNUSED(ptr))
 {
-	bScreen *sc = (bScreen *)ptr->data;
-
-	/* exception: must use context so notifier gets to the right window  */
-	if (sc->newscene) {
-#ifdef WITH_PYTHON
-		BPy_BEGIN_ALLOW_THREADS;
-#endif
-
-		ED_screen_set_scene(C, sc, sc->newscene);
-
-#ifdef WITH_PYTHON
-		BPy_END_ALLOW_THREADS;
-#endif
-
-		WM_event_add_notifier(C, NC_SCENE | ND_SCENEBROWSE, sc->newscene);
+	/* can be NULL on file load, T42619 */
+	wmWindowManager *wm = G.main->wm.first;
+	return wm ? (ED_screen_animation_playing(wm) != NULL) : 0;
+}
 
-		if (G.debug & G_DEBUG)
-			printf("scene set %p\n", sc->newscene);
+static void rna_Screen_layout_name_get(PointerRNA *ptr, char *value)
+{
+	const bScreen *screen = ptr->data;
+	const WorkSpaceLayout *layout = BKE_workspace_layout_find_global(G.main, screen, NULL);
 
-		sc->newscene = NULL;
+	if (layout) {
+		const char *name = BKE_workspace_layout_name_get(layout);
+		strcpy(value, name);
+	}
+	else {
+		value[0] = '\0';
 	}
 }
 
-static void rna_Screen_redraw_update(Main *UNUSED(bmain), Scene *UNUSED(scene), PointerRNA *ptr)
+static int rna_Screen_layout_name_length(PointerRNA *ptr)
 {
-	bScreen *screen = (bScreen *)ptr->data;
+	const bScreen *screen = ptr->data;
+	const WorkSpaceLayout *layout = BKE_workspace_layout_find_global(G.main, screen, NULL);
 
-	/* the settings for this are currently only available from a menu in the TimeLine, hence refresh=SPACE_TIME */
-	ED_screen_animation_timer_update(screen, screen->redraws_flag, SPACE_TIME);
-}
+	if (layout) {
+		const char *name = BKE_workspace_layout_name_get(layout);
+		return strlen(name);
+	}
 
+	return 0;
+}
 
-static int rna_Screen_is_animation_playing_get(PointerRNA *UNUSED(ptr))
+static void rna_Screen_layout_name_set(PointerRNA *ptr, const char *value)
 {
-	/* can be NULL on file load, T42619 */
-	wmWindowManager *wm = G.main->wm.first;
-	return wm ? (ED_screen_animation_playing(wm) != NULL) : 0;
+	bScreen *screen = ptr->data;
+	WorkSpace *workspace;
+	WorkSpaceLayout *layout = BKE_workspace_layout_find_global(G.main, screen, &workspace);
+
+	if (layout) {
+		BKE_workspace_layout_name_set(workspace, layout, value);
+	}
 }
 
 static int rna_Screen_fullscreen_get(PointerRNA *ptr)
@@ -152,7 +156,7 @@ static void rna_Area_type_update(bContext *C, PointerRNA *ptr)
 
 	/* XXX this call still use context, so we trick it to work in the right context */
 	for (win = wm->windows.first; win; win = win->next) {
-		if (sc == win->screen) {
+		if (sc == WM_window_get_active_screen(win)) {
 			wmWindow *prevwin = CTX_wm_window(C);
 			ScrArea *prevsa = CTX_wm_area(C);
 			ARegion *prevar = CTX_wm_region(C);
@@ -377,13 +381,11 @@ static void rna_def_screen(BlenderRNA *brna)
 	RNA_def_struct_ui_text(srna, "Screen", "Screen data-block, defining the layout of areas in a window");
 	RNA_def_struct_ui_icon(srna, ICON_SPLITSCREEN);
 
-	/* pointers */
-	prop = RNA_def_property(srna, "scene", PROP_POINTER, PROP_NONE);
-	RNA_def_property_flag(prop, PROP_EDITABLE | PROP_NEVER_NULL);
-	RNA_def_property_pointer_funcs(prop, NULL, "rna_Screen_scene_set", NULL, NULL);
-	RNA_def_property_ui_text(prop, "Scene", "Active scene to be edited in the screen");
-	RNA_def_property_flag(prop, PROP_CONTEXT_UPDATE);
-	RNA_def_property_update(prop, 0, "rna_Screen_scene_update");
+	prop = RNA_def_property(srna, "layout_name", PROP_STRING, PROP_NONE);
+	RNA_def_property_string_funcs(prop, "rna_Screen_layout_name_get", "rna_Screen_layout_name_length",
+	                              "rna_Screen_layout_name_set");
+	RNA_def_property_ui_text(prop, "Layout Name", "The name of the layout that refers to the screen");
+	RNA_def_struct_name_property(srna, prop);
 
 	/* collections */
 	prop = RNA_def_property(srna, "areas", PROP_COLLECTION, PROP_NONE);
diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index 0eedcb25b4c..0e16b410dc7 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -256,6 +256,7 @@ EnumPropertyItem rna_enum_file_sort_items[] = {
 #include "BKE_context.h"
 #include "BKE_depsgraph.h"
 #include "BKE_layer.h"
+#include "BKE_global.h"
 #include "BKE_nla.h"
 #include "BKE_paint.h"
 #include "BKE_scene.h"
@@ -407,7 +408,7 @@ static void rna_Space_view2d_sync_update(Main *UNUSED(bmain), Scene *UNUSED(scen
 
 static PointerRNA rna_CurrentOrientation_get(PointerRNA *ptr)
 {
-	Scene *scene = ((bScreen *)ptr->id.data)->scene;
+	Scene *scene = WM_windows_scene_get_from_screen(G.main->wm.first, ptr->id.data);
 	View3D *v3d = (View3D *)ptr->data;
 
 	if (v3d->twmode < V3D_MANIP_CUSTOM)
@@ -429,7 +430,7 @@ EnumPropertyItem *rna_TransformOrientation_itemf(bContext *C, PointerRNA *ptr, P
 	RNA_enum_items_add(&item, &totitem, transform_orientation_items);
 
 	if (ptr->type == &RNA_SpaceView3D)
-		scene = ((bScreen *)ptr->id.data)->scene;
+		scene = WM_windows_scene_get_from_screen(G.main->wm.first, ptr->id.data);
 	else
 		scene = CTX_data_scene(C);  /* can't use scene from ptr->id.data because that enum is also used by operators */
 
@@ -460,8 +461,10 @@ static void rna_SpaceView3D_camera_update(Main *bmain, Scene *scene, PointerRNA
 {
 	View3D *v3d = (View3D *)(ptr->data);
 	if (v3d->scenelock) {
+		wmWindowManager *wm = bmain->wm.first;
+
 		scene->camera = v3d->camera;
-		BKE_screen_view3d_main_sync(&bmain->screen, scene);
+		WM_windows_scene_data_sync(&wm->windows, scene);
 	}
 }
 
@@ -473,8 +476,10 @@ static void rna_SpaceView3D_lock_camera_and_layers_set(PointerRNA *ptr, int valu
 	v3d->scenelock = value;
 
 	if (value) {
+		Scene *scene = ED_screen_scene_find(sc, G.main->wm.first);
 		int bit;
-		v3d->lay = sc->scene->lay;
+
+		v3d->lay = scene->lay;
 		/* seek for layact */
 		bit = 0;
 		while (bit < 32) {
@@ -484,15 +489,15 @@ static void rna_SpaceView3D_lock_camera_and_layers_set(PointerRNA *ptr, int valu
 			}
 			bit++;
 		}
-		v3d->camera = sc->scene->camera;
+		v3d->camera = scene->camera;
 	}
 }
 
 static void rna_View3D_CursorLocation_get(PointerRNA *ptr, float *values)
 {
 	View3D *v3d = (View3D *)(ptr->data);
-	bScreen *sc = (bScreen *)ptr->id.data;
-	Scene *scene = (Scene *)sc->scene;
+	bScreen *screen = ptr->id.data;
+	Scene *scene = ED_screen_scene_find(screen, G.main->wm.first);
 	const float *loc = ED_view3d_cursor3d_get(scene, v3d);
 
 	copy_v3_v3(values, loc);
@@ -501,8 +506,8 @@ static void rna_View3D_CursorLocation_get(PointerRNA *ptr, float *values)
 static void rna_View3D_CursorLocation_set(PointerRNA *ptr, const float *values)
 {
 	View3D *v3d = (View3D *)(ptr->data);
-	bScreen *sc = (bScreen *)ptr->id.data;
-	Scene *scene = (Scene *)sc->scene;
+	bScreen *screen = ptr->id.data;
+	Scene *scene = ED_screen_scene_find(screen, G.main->wm.first);
 	float *cursor = ED_view3d_cursor3d_get(scene, v3d);
 
 	copy_v3_v3(cursor, values);
@@ -511,8 +516,8 @@ static void rna_View3D_CursorLocation_set(PointerRNA *ptr, const float *values)
 static float rna_View3D_GridScaleUnit_get(PointerRNA *ptr)
 {
 	View3D *v3d = (View3D *)(ptr->data);
-	bScreen *sc = (bScreen *)ptr->id.data;
-	Scene *scene = (Scene *)sc->scene;
+	bScreen *screen = ptr->id.data;
+	Scene *scene = ED_screen_scene_find(screen, G.main->wm.first);
 
 	return ED_view3d_grid_scale(scene, v3d, NULL);
 }
@@ -696,7 +701,7 @@ static void rna_RegionView3D_view_matrix_set(PointerRNA *ptr, const float *value
 
 static int rna_SpaceView3D_viewport_shade_get(PointerRNA *ptr)
 {
-	Scene *scene = ((bScreen *)ptr->id.data)->scene;
+	Scene *scene = WM_windows_scene_get_from_screen(G.main->wm.first, ptr->id.data);
 	RenderEngineType *type = RE_engines_find(scene->r.engine);
 	View3D *v3d = (View3D *)ptr->data;
 	int drawtype = v3d->drawtype;
@@ -716,10 +721,11 @@ static void rna_SpaceView3D_viewport_shade_set(PointerRNA *ptr, int value)
 	v3d->drawtype = value;
 }
 
-static EnumPropertyItem *rna_SpaceView3D_viewport_shade_itemf(bContext *UNUSED(C), PointerRNA *ptr,
+static EnumPropertyItem *rna_SpaceView3D_viewport_shade_itemf(bContext *C, PointerRNA *UNUSED(ptr),
                                                               PropertyRNA *UNUSED(prop), bool *r_free)
 {
-	Scene *scene = ((bScreen *)ptr->id.data)->scene;
+	wmWindow *win = CTX_wm_window(C);
+	Scene *scene = WM_window_get_active_scene(win);
 	RenderEngineType *type = RE_engines_find(scene->r.engine);
 
 	EnumPropertyItem *item = NULL;
@@ -740,10 +746,10 @@ static EnumPropertyItem *rna_SpaceView3D_viewport_shade_itemf(bContext *UNUSED(C
 	return item;
 }
 
-static EnumPropertyItem *rna_SpaceView3D_stereo3d_camera_itemf(bContext *UNUSED(C), PointerRNA *ptr,
+static EnumPropertyItem *rna_SpaceView3D_stereo3d_camera_itemf(bContext *C, PointerRNA *UNUSED(ptr),
                                                                PropertyRNA *UNUSED(prop), bool *UNUSED(r_free))
 {
-	Scene *scene = ((bScreen *)ptr->id.data)->scene;
+	Scene *scene = CTX_data_scene(C);
 
 	if (scene->r.views_format == SCE_VIEWS_FORMAT_MULTIVIEW)
 		return multiview_camera_items;
@@ -811,16 +817,17 @@ static int rna_SpaceImageEditor_show_uvedit_get(PointerRNA *ptr)
 {
 	SpaceImage *sima = (SpaceImage *)(ptr->data);
 	bScreen *sc = (bScreen *)ptr->id.data;
-	return ED_space_image_show_uvedit(sima, sc->scene->obedit);
+	Scene *scene = ED_screen_scene_find(sc, G.main->wm.first);
+
+	return ED_space_image_show_uvedit(sima, scene->obedit);
 }
 
 static int rna_SpaceImageEditor_show_maskedit_get(PointerRNA *ptr)
 {
 	SpaceImage *sima = (SpaceImage *)(ptr->data);
 	bScreen *sc = (bScreen *)ptr->id.data;
-
-	TODO_LAYER_CONTEXT; /* get SceneLayer from context/window/workspace instead */
-	SceneLayer *sl = BKE_scene_layer_context_active(sc->scene);
+	Scene *scene = ED_screen_scene_find(sc, G.main->wm.first);
+	SceneLayer *sl = BKE_scene_layer_context_active(scene);
 
 	return ED_space_image_check_show_maskedit(sl, sima);
 }
@@ -829,8 +836,9 @@ static void rna_SpaceImageEditor_image_set(PointerRNA *ptr, PointerRNA value)
 {
 	SpaceImage *sima = (SpaceImage *)(ptr->data);
 	bScreen *sc = (bScreen *)ptr->id.data;
+	Scene *scene = ED_screen_scene_find(sc, G.main->wm.first);
 
-	ED_space_image_set(sima, sc->scene, sc->scene->obedit, (Image *)value.data);
+	ED_space_image_set(sima, scene, scene->obedit, (Image *)value.data);
 }
 
 static void rna_SpaceImageEditor_mask_set(PointerRNA *ptr, PointerRNA value)
@@ -3880,6 +3888,7 @@ static void rna_def_fileselect_params(BlenderRNA *brna)
 		{FILTER_ID_TXT, "TEXT", ICON_TEXT, "Texts", "Show/hide Text data-blocks"},
 		{FILTER_ID_VF, "FONT", ICON_FONT_DATA, "Fonts", "Show/hide Font data-blocks"},
 		{FILTER_ID_WO, "WORLD", ICON_WORLD_DATA, "Worlds", "Show/hide World data-blocks"},
+		{FILTER_ID_WS, "WORK_SPACE", ICON_NONE, "Workspaces", "Show/hide workspace data-blocks"},
 		{0, NULL, 0, NULL, NULL}
 	};
 
@@ -3897,7 +3906,7 @@ static void rna_def_fileselect_params(BlenderRNA *brna)
 	     "Show/hide materials, nodetrees, textures and Freestyle's linestyles"},
 		{FILTER_ID_IM | FILTER_ID_MC | FILTER_ID_MSK | FILTER_ID_SO,
 	     "IMAGE", ICON_IMAGE_DATA, "Images & Sounds", "Show/hide images, movie clips, sounds and masks"},
-		{FILTER_ID_CA | FILTER_ID_LA | FILTER_ID_SPK | FILTER_ID_WO,
+		{FILTER_ID_CA | FILTER_ID_LA | FILTER_ID_SPK | FILTER_ID_WO | FILTER_ID_WS,
 	     "ENVIRONMENT", ICON_WORLD_DATA, "Environment", "Show/hide worlds, lamps, cameras and speakers"},
 		{FILTER_ID_BR | FILTER_ID_GD | FILTER_ID_PA | FILTER_ID_PAL | FILTER_ID_PC | FILTER_ID_TXT | FILTER_ID_VF | FILTER_ID_CF,
 	     "MISC", ICON_GREASEPENCIL, "Miscellaneous", "Show/hide other data types"},
diff --git a/source/blender/makesrna/intern/rna_space_api.c b/source/blender/makesrna/intern/rna_space_api.c
index 8f771eda99d..aabe421b872 100644
--- a/source/blender/makesrna/intern/rna_space_api.c
+++ b/source/blender/makesrna/intern/rna_space_api.c
@@ -31,6 +31,9 @@
 
 #ifdef RNA_RUNTIME
 
+#include "BKE_global.h"
+
+#include "ED_screen.h"
 #include "ED_text.h"
 
 static void rna_RegionView3D_update(ID *id, RegionView3D *rv3d)
@@ -43,11 +46,10 @@ static void rna_RegionView3D_update(ID *id, RegionView3D *rv3d)
 	area_region_from_regiondata(sc, rv3d, &sa, &ar);
 
 	if (sa && ar && sa->spacetype == SPACE_VIEW3D) {
-		View3D *v3d;
-
-		v3d = (View3D *)sa->spacedata.first;
+		View3D *v3d = sa->spacedata.first;
+		Scene *scene = ED_screen_scene_find(sc, G.main->wm.first);
 
-		ED_view3d_update_viewmat(sc->scene, v3d, ar, NULL, NULL, NULL);
+		ED_view3d_update_viewmat(scene, v3d, ar, NULL, NULL, NULL);
 	}
 }
 
diff --git a/source/blender/makesrna/intern/rna_userdef.c b/source/blender/makesrna/intern/rna_userdef.c
index d1e89ea18d0..a0fb398ee3a 100644
--- a/source/blender/makesrna/intern/rna_userdef.c
+++ b/source/blender/makesrna/intern/rna_userdef.c
@@ -3335,11 +3335,6 @@ static void rna_def_userdef_view(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Display Object Info", "Display objects name and frame number in 3D view");
 	RNA_def_property_update(prop, 0, "rna_userdef_update");
 
-	prop = RNA_def_property(srna, "use_global_scene", PROP_BOOLEAN, PROP_NONE);
-	RNA_def_property_boolean_sdna(prop, NULL, "flag", USER_SCENEGLOBAL);
-	RNA_def_property_ui_text(prop, "Global Scene", "Force the current Scene to be displayed in all Screens");
-	RNA_def_property_update(prop, 0, "rna_userdef_update");
-
 	prop = RNA_def_property(srna, "show_large_cursors", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_sdna(prop, NULL, "curssize", 0);
 	RNA_def_property_ui_text(prop, "Large Cursors", "Use large mouse cursors when available");
diff --git a/source/blender/makesrna/intern/rna_wm.c b/source/blender/makesrna/intern/rna_wm.c
index b458b2e69d5..f6e67d5f765 100644
--- a/source/blender/makesrna/intern/rna_wm.c
+++ b/source/blender/makesrna/intern/rna_wm.c
@@ -461,12 +461,23 @@ EnumPropertyItem rna_enum_wm_report_items[] = {
 
 #include "WM_api.h"
 
+#include "DNA_workspace_types.h"
+
+#include "ED_screen.h"
+
 #include "UI_interface.h"
 
+#include "BKE_global.h"
 #include "BKE_idprop.h"
+#include "BKE_workspace.h"
 
 #include "MEM_guardedalloc.h"
 
+#ifdef WITH_PYTHON
+#  include "BPY_extern.h"
+#endif
+
+
 static wmOperator *rna_OperatorProperties_find_operator(PointerRNA *ptr)
 {
 	wmWindowManager *wm = ptr->id.data;
@@ -621,39 +632,120 @@ static PointerRNA rna_PieMenu_layout_get(PointerRNA *ptr)
 	return rptr;
 }
 
-static void rna_Window_screen_set(PointerRNA *ptr, PointerRNA value)
+static void rna_Window_scene_set(PointerRNA *ptr, PointerRNA value)
+{
+	wmWindow *win = ptr->data;
+
+	if (value.data == NULL) {
+		return;
+	}
+
+	win->new_scene = value.data;
+}
+
+static void rna_Window_scene_update(bContext *C, PointerRNA *ptr)
+{
+	Main *bmain = CTX_data_main(C);
+	wmWindow *win = ptr->data;
+
+	/* exception: must use context so notifier gets to the right window  */
+	if (win->new_scene) {
+#ifdef WITH_PYTHON
+		BPy_BEGIN_ALLOW_THREADS;
+#endif
+
+		WM_window_change_active_scene(bmain, C, win, win->new_scene);
+
+#ifdef WITH_PYTHON
+		BPy_END_ALLOW_THREADS;
+#endif
+
+		WM_event_add_notifier(C, NC_SCENE | ND_SCENEBROWSE, win->new_scene);
+
+		if (G.debug & G_DEBUG)
+			printf("scene set %p\n", win->new_scene);
+
+		win->new_scene = NULL;
+	}
+}
+
+static PointerRNA rna_Window_workspace_get(PointerRNA *ptr)
+{
+	wmWindow *win = ptr->data;
+	return rna_pointer_inherit_refine(ptr, &RNA_WorkSpace, BKE_workspace_active_get(win->workspace_hook));
+}
+
+static void rna_Window_workspace_set(PointerRNA *ptr, PointerRNA value)
 {
 	wmWindow *win = (wmWindow *)ptr->data;
 
 	/* disallow ID-browsing away from temp screens */
-	if (win->screen->temp) {
+	if (WM_window_is_temp_screen(win)) {
 		return;
 	}
+	if (value.data == NULL) {
+		return;
+	}
+
+	/* exception: can't set workspaces inside of area/region handlers */
+	win->workspace_hook->temp_workspace_store = value.data;
+}
+
+static void rna_Window_workspace_update(bContext *C, PointerRNA *ptr)
+{
+	wmWindow *win = ptr->data;
+	WorkSpace *new_workspace = win->workspace_hook->temp_workspace_store;
+
+	/* exception: can't set screens inside of area/region handlers,
+	 * and must use context so notifier gets to the right window */
+	if (new_workspace) {
+		WM_event_add_notifier(C, NC_SCREEN | ND_WORKSPACE_SET, new_workspace);
+		win->workspace_hook->temp_workspace_store = NULL;
+	}
+}
+
+PointerRNA rna_Window_screen_get(PointerRNA *ptr)
+{
+	wmWindow *win = ptr->data;
+	return rna_pointer_inherit_refine(ptr, &RNA_Screen, BKE_workspace_active_screen_get(win->workspace_hook));
+}
 
-	if (value.data == NULL)
+static void rna_Window_screen_set(PointerRNA *ptr, PointerRNA value)
+{
+	wmWindow *win = ptr->data;
+	WorkSpace *workspace = BKE_workspace_active_get(win->workspace_hook);
+	WorkSpaceLayout *layout_new;
+	const bScreen *screen = BKE_workspace_active_screen_get(win->workspace_hook);
+
+	/* disallow ID-browsing away from temp screens */
+	if (screen->temp) {
+		return;
+	}
+	if (value.data == NULL) {
 		return;
+	}
 
 	/* exception: can't set screens inside of area/region handlers */
-	win->newscreen = value.data;
+	layout_new = BKE_workspace_layout_find(workspace, value.data);
+	win->workspace_hook->temp_layout_store = layout_new;
 }
 
 static int rna_Window_screen_assign_poll(PointerRNA *UNUSED(ptr), PointerRNA value)
 {
-	bScreen *screen = (bScreen *)value.id.data;
-
+	bScreen *screen = value.id.data;
 	return !screen->temp;
 }
 
-
-static void rna_Window_screen_update(bContext *C, PointerRNA *ptr)
+static void rna_workspace_screen_update(bContext *C, PointerRNA *ptr)
 {
-	wmWindow *win = (wmWindow *)ptr->data;
+	wmWindow *win = ptr->data;
+	WorkSpaceLayout *layout_new = win->workspace_hook->temp_layout_store;
 
 	/* exception: can't set screens inside of area/region handlers,
 	 * and must use context so notifier gets to the right window */
-	if (win->newscreen) {
-		WM_event_add_notifier(C, NC_SCREEN | ND_SCREENBROWSE, win->newscreen);
-		win->newscreen = NULL;
+	if (layout_new) {
+		WM_event_add_notifier(C, NC_SCREEN | ND_LAYOUTBROWSE, layout_new);
+		win->workspace_hook->temp_layout_store = NULL;
 	}
 }
 
@@ -1910,14 +2002,28 @@ static void rna_def_window(BlenderRNA *brna)
 
 	rna_def_window_stereo3d(brna);
 
-	prop = RNA_def_property(srna, "screen", PROP_POINTER, PROP_NONE);
+	prop = RNA_def_property(srna, "scene", PROP_POINTER, PROP_NONE);
+	RNA_def_property_flag(prop, PROP_EDITABLE | PROP_NEVER_NULL);
+	RNA_def_property_pointer_funcs(prop, NULL, "rna_Window_scene_set", NULL, NULL);
+	RNA_def_property_ui_text(prop, "Scene", "Active scene to be edited in the window");
+	RNA_def_property_flag(prop, PROP_CONTEXT_UPDATE);
+	RNA_def_property_update(prop, 0, "rna_Window_scene_update");
+
+	prop = RNA_def_property(srna, "workspace", PROP_POINTER, PROP_NONE);
 	RNA_def_property_flag(prop, PROP_NEVER_NULL);
+	RNA_def_property_struct_type(prop, "WorkSpace");
+	RNA_def_property_ui_text(prop, "Workspace", "Active workspace showing in the window");
+	RNA_def_property_pointer_funcs(prop, "rna_Window_workspace_get", "rna_Window_workspace_set", NULL, NULL);
+	RNA_def_property_flag(prop, PROP_EDITABLE | PROP_CONTEXT_UPDATE);
+	RNA_def_property_update(prop, 0, "rna_Window_workspace_update");
+
+	prop = RNA_def_property(srna, "screen", PROP_POINTER, PROP_NONE);
 	RNA_def_property_struct_type(prop, "Screen");
-	RNA_def_property_ui_text(prop, "Screen", "Active screen showing in the window");
-	RNA_def_property_flag(prop, PROP_EDITABLE);
-	RNA_def_property_pointer_funcs(prop, NULL, "rna_Window_screen_set", NULL, "rna_Window_screen_assign_poll");
-	RNA_def_property_flag(prop, PROP_CONTEXT_UPDATE);
-	RNA_def_property_update(prop, 0, "rna_Window_screen_update");
+	RNA_def_property_ui_text(prop, "Screen", "Active workspace screen showing in the window");
+	RNA_def_property_pointer_funcs(prop, "rna_Window_screen_get", "rna_Window_screen_set", NULL,
+	                               "rna_Window_screen_assign_poll");
+	RNA_def_property_flag(prop, PROP_NEVER_NULL | PROP_EDITABLE | PROP_CONTEXT_UPDATE);
+	RNA_def_property_update(prop, 0, "rna_workspace_screen_update");
 
 	prop = RNA_def_property(srna, "x", PROP_INT, PROP_NONE);
 	RNA_def_property_int_sdna(prop, NULL, "posx");
diff --git a/source/blender/makesrna/intern/rna_workspace.c b/source/blender/makesrna/intern/rna_workspace.c
new file mode 100644
index 00000000000..29fe5bae0e4
--- /dev/null
+++ b/source/blender/makesrna/intern/rna_workspace.c
@@ -0,0 +1,144 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/makesrna/intern/rna_workspace.c
+ *  \ingroup RNA
+ */
+
+#include "RNA_define.h"
+#include "RNA_enum_types.h"
+#include "RNA_types.h"
+
+#include "BKE_workspace.h"
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+#include "rna_internal.h"
+
+
+#ifdef RNA_RUNTIME
+
+#include "BKE_global.h"
+
+#include "BLI_listbase.h"
+
+#include "DNA_object_types.h"
+#include "DNA_screen_types.h"
+
+#include "RNA_access.h"
+
+
+void rna_workspace_screens_begin(CollectionPropertyIterator *iter, PointerRNA *ptr)
+{
+	WorkSpace *workspace = ptr->id.data;
+	rna_iterator_listbase_begin(iter, BKE_workspace_layouts_get(workspace), NULL);
+}
+
+static PointerRNA rna_workspace_screens_item_get(CollectionPropertyIterator *iter)
+{
+	WorkSpaceLayout *layout = rna_iterator_listbase_get(iter);
+	bScreen *screen = BKE_workspace_layout_screen_get(layout);
+
+	return rna_pointer_inherit_refine(&iter->parent, &RNA_Screen, screen);
+}
+
+#ifdef USE_WORKSPACE_MODE
+
+static int rna_workspace_object_mode_get(PointerRNA *ptr)
+{
+	WorkSpace *workspace = ptr->data;
+	return (int)BKE_workspace_object_mode_get(workspace);
+}
+
+static void rna_workspace_object_mode_set(PointerRNA *ptr, int value)
+{
+	WorkSpace *workspace = ptr->data;
+	BKE_workspace_object_mode_set(workspace, value);
+}
+
+#endif /* USE_WORKSPACE_MODE */
+
+static PointerRNA rna_workspace_render_layer_get(PointerRNA *ptr)
+{
+	WorkSpace *workspace = ptr->data;
+	SceneLayer *render_layer = BKE_workspace_render_layer_get(workspace);
+
+	/* XXX hmrf... lookup in getter... but how could we avoid it? */
+	for (Scene *scene = G.main->scene.first; scene; scene = scene->id.next) {
+		if (BLI_findindex(&scene->render_layers, render_layer) != -1) {
+			PointerRNA scene_ptr;
+
+			RNA_id_pointer_create(&scene->id, &scene_ptr);
+			return rna_pointer_inherit_refine(&scene_ptr, &RNA_SceneLayer, render_layer);
+		}
+	}
+
+	return PointerRNA_NULL;
+}
+
+static void rna_workspace_render_layer_set(PointerRNA *ptr, PointerRNA value)
+{
+	WorkSpace *workspace = ptr->data;
+	BKE_workspace_render_layer_set(workspace, value.data);
+}
+
+#else /* RNA_RUNTIME */
+
+static void rna_def_workspace(BlenderRNA *brna)
+{
+	StructRNA *srna;
+	PropertyRNA *prop;
+
+	srna = RNA_def_struct(brna, "WorkSpace", "ID");
+	RNA_def_struct_sdna(srna, "WorkSpace");
+	RNA_def_struct_ui_text(srna, "Workspace", "Workspace data-block, defining the working environment for the user");
+	/* TODO: real icon, just to show something */
+	RNA_def_struct_ui_icon(srna, ICON_RENDER_RESULT);
+
+	prop = RNA_def_property(srna, "screens", PROP_COLLECTION, PROP_NONE);
+	RNA_def_property_collection_sdna(prop, NULL, "layouts", NULL);
+	RNA_def_property_struct_type(prop, "Screen");
+	RNA_def_property_collection_funcs(prop, "rna_workspace_screens_begin", NULL, NULL,
+	                                  "rna_workspace_screens_item_get", NULL, NULL, NULL, NULL);
+	RNA_def_property_ui_text(prop, "Screens", "Screen layouts of a workspace");
+
+#ifdef USE_WORKSPACE_MODE
+	prop = RNA_def_property(srna, "object_mode", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_items(prop, rna_enum_object_mode_items);
+	RNA_def_property_enum_funcs(prop, "rna_workspace_object_mode_get", "rna_workspace_object_mode_set", NULL);
+	RNA_def_property_ui_text(prop, "Mode", "Object interaction mode");
+#endif
+
+	prop = RNA_def_property(srna, "render_layer", PROP_POINTER, PROP_NONE);
+	RNA_def_property_struct_type(prop, "SceneLayer");
+	RNA_def_property_pointer_funcs(prop, "rna_workspace_render_layer_get", "rna_workspace_render_layer_set",
+	                               NULL, NULL);
+	RNA_def_property_ui_text(prop, "Active Render Layer", "The active render layer used in this workspace");
+	RNA_def_property_flag(prop, PROP_EDITABLE | PROP_NEVER_NULL);
+	RNA_def_property_update(prop, NC_SCREEN | ND_LAYER, NULL);
+}
+
+void RNA_def_workspace(BlenderRNA *brna)
+{
+	rna_def_workspace(brna);
+}
+
+#endif /* RNA_RUNTIME */