Initial implementation of basic docking API

example/example.script

@@ -59,6 +59,7 @@ function init(self)
 	self.show_demo_window = false
 	self.show_close_window = false
 	self.show_live_data = false
+	self.dockspace = false
 
 	imgui.set_ini_filename()
 	set_style()
@@ -112,6 +113,11 @@ local function update_tab1(self)
 		self.show_demo_window = checked
 	end
 
+	changed, checked = imgui.checkbox("Docking", self.dockspace)
+	if changed then
+		self.dockspace = checked
+	end
+
 	imgui.separator()
 
 	if imgui.radio_button("Option 1", self.radio == 1) then
@@ -494,6 +500,12 @@ end
 function update(self, dt)
 	main_menu_bar(self)
 
+	if self.dockspace then
+		local viewport = imgui.get_main_viewport()
+		local dockspace = imgui.dock_space_over_viewport(viewport)
+		print()
+	end
+
 	if self.show_demo_window then
 		imgui.demo()
 	end

imgui/src/extension_imgui.cpp

@@ -1868,6 +1868,30 @@ static int imgui_SetScrollHereY(lua_State *L)
     return 0;
 }
 
+// ----------------------------
+// ----- DOCKING --------------
+// ----------------------------
+
+static int imgui_DockSpaceOverViewport(lua_State *L)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+
+    DM_LUA_STACK_CHECK(L, 1);
+    ImGuiViewport* viewport = (ImGuiViewport*)lua_touserdata(L, 1);
+    ImGuiID dockspace_id = ImGui::DockSpaceOverViewport(viewport);
+
+    lua_pushnumber(L, dockspace_id);
+    return 1;
+}
+
+static int imgui_GetMainViewport(lua_State *L)
+{
+    DM_LUA_STACK_CHECK(L, 1);
+    void* viewport = (void*)ImGui::GetMainViewport();
+    lua_pushlightuserdata(L, viewport);
+    return 1;
+}
 
 // ----------------------------
 // ----- FONT -----------------
@@ -2355,6 +2379,9 @@ static const luaL_reg Module_methods[] =
     {"get_frame_height", imgui_GetFrameHeight},
 
     {"set_scroll_here_y", imgui_SetScrollHereY},
+
+    {"dock_space_over_viewport", imgui_DockSpaceOverViewport},
+    {"get_main_viewport", imgui_GetMainViewport},
     {0, 0}
 };