Reimplements changes from accidentally closed PR

backends/imgui_impl_glfw.cpp

@@ -147,6 +147,7 @@
 #define GLFW_HAS_GAMEPAD_API            (GLFW_VERSION_COMBINED >= 3300) // 3.3+ glfwGetGamepadState() new api
 #define GLFW_HAS_GETKEYNAME             (GLFW_VERSION_COMBINED >= 3200) // 3.2+ glfwGetKeyName()
 #define GLFW_HAS_GETERROR               (GLFW_VERSION_COMBINED >= 3300) // 3.3+ glfwGetError()
+#define GLFW_HAS_TRANSPARENT_FRAMEBUFFERS (GLFW_VERSION_COMBINED >= 3300)
 
 // GLFW data
 enum GlfwClientApi
@@ -1089,6 +1090,9 @@ static void ImGui_ImplGlfw_CreateWindow(ImGuiViewport* viewport)
     glfwWindowHint(GLFW_DECORATED, (viewport->Flags & ImGuiViewportFlags_NoDecoration) ? false : true);
 #if GLFW_HAS_WINDOW_TOPMOST
     glfwWindowHint(GLFW_FLOATING, (viewport->Flags & ImGuiViewportFlags_TopMost) ? true : false);
+#endif
+#if GLFW_HAS_TRANSPARENT_FRAMEBUFFERS
+    glfwWindowHint(GLFW_TRANSPARENT_FRAMEBUFFER, true);
 #endif
     GLFWwindow* share_window = (bd->ClientApi == GlfwClientApi_OpenGL) ? bd->Window : nullptr;
     vd->Window = glfwCreateWindow((int)viewport->Size.x, (int)viewport->Size.y, "No Title Yet", nullptr, share_window);

backends/imgui_impl_opengl2.cpp

@@ -135,6 +135,9 @@ static void ImGui_ImplOpenGL2_SetupRenderState(ImDrawData* draw_data, int fb_wid
     // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, vertex/texcoord/color pointers, polygon fill.
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    // technically supported by openGL2, but not exposed via GL.h, may need a loader?
+    // See https://registry.khronos.org/OpenGL-Refpages/gl2.1/xhtml/glBlendFuncSeparate.xml
+    // https://registry.khronos.org/OpenGL/specs/gl/glspec20.pdf
     //glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA); // In order to composite our output buffer we need to preserve alpha
     glDisable(GL_CULL_FACE);
     glDisable(GL_DEPTH_TEST);

backends/imgui_impl_opengl3.cpp

@@ -970,7 +970,7 @@ static void ImGui_ImplOpenGL3_RenderWindow(ImGuiViewport* viewport, void*)
 {
     if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
     {
-        ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
+        ImVec4 clear_color = ImGui::GetStyle().Colors[ImGuiCol_WindowBg];
         glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
         glClear(GL_COLOR_BUFFER_BIT);
     }

backends/imgui_impl_vulkan.cpp

@@ -1461,6 +1461,8 @@ void ImGui_ImplVulkanH_CreateWindowSwapChain(VkPhysicalDevice physical_device, V
         VkSurfaceCapabilitiesKHR cap;
         err = vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physical_device, wd->Surface, &cap);
         check_vk_result(err);
+        if (cap.supportedCompositeAlpha & VK_COMPOSITE_ALPHA_POST_MULTIPLIED_BIT_KHR)
+            info.compositeAlpha = VK_COMPOSITE_ALPHA_POST_MULTIPLIED_BIT_KHR;
         if (info.minImageCount < cap.minImageCount)
             info.minImageCount = cap.minImageCount;
         else if (cap.maxImageCount != 0 && info.minImageCount > cap.maxImageCount)
@@ -1770,7 +1772,7 @@ static void ImGui_ImplVulkan_RenderWindow(ImGuiViewport* viewport, void*)
             check_vk_result(err);
         }
         {
-            ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
+            ImVec4 clear_color = ImGui::GetStyle().Colors[ImGuiCol_WindowBg];
             memcpy(&wd->ClearValue.color.float32[0], &clear_color, 4 * sizeof(float));
         }
 #ifdef IMGUI_IMPL_VULKAN_HAS_DYNAMIC_RENDERING

examples/example_glfw_opengl3/main.cpp

@@ -63,6 +63,7 @@ int main(int, char**)
     //glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+ only
     //glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);            // 3.0+ only
 #endif
+    glfwWindowHint(GLFW_TRANSPARENT_FRAMEBUFFER, GL_TRUE); // Enable transparent backbuffers
 
     // Create window with graphics context
     GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+OpenGL3 example", nullptr, nullptr);
@@ -74,11 +75,13 @@ int main(int, char**)
     // Setup Dear ImGui context
     IMGUI_CHECKVERSION();
     ImGui::CreateContext();
+
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
     io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
     io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
+    io.ConfigFlags |= ImGuiConfigFlags_TransparentBackbuffers; // Enable transparent backbuffer
     //io.ConfigViewportsNoAutoMerge = true;
     //io.ConfigViewportsNoTaskBarIcon = true;
 
@@ -156,7 +159,7 @@ int main(int, char**)
 
         // 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
         {
-            static float f = 0.0f;
+            static float f = 1.0f;
             static int counter = 0;
 
             ImGui::Begin("Hello, world!");                          // Create a window called "Hello, world!" and append into it.
@@ -165,8 +168,10 @@ int main(int, char**)
             ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our window open/close state
             ImGui::Checkbox("Another Window", &show_another_window);
 
-            ImGui::SliderFloat("float", &f, 0.0f, 1.0f);            // Edit 1 float using a slider from 0.0f to 1.0f
+            ImGui::SliderFloat("Window Opacity", &ImGui::GetStyle().Colors[ImGuiCol_WindowBg].w, 0.0f, 1.0f); // Edit background window opacity (alpha channel)
-            ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
+            ImGui::ColorEdit4("clear color", (float*)&clear_color); // Edit 4 floats representing an RGBA color
+            clear_color.w = ImGui::GetStyle().Colors[ImGuiCol_WindowBg].w;
+
 
             if (ImGui::Button("Button"))                            // Buttons return true when clicked (most widgets return true when edited/activated)
                 counter++;

examples/example_glfw_vulkan/main.cpp

@@ -398,6 +398,7 @@ int main(int, char**)
 
     // Create window with Vulkan context
     glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
+    glfwWindowHint(GLFW_TRANSPARENT_FRAMEBUFFER, GLFW_TRUE);
     GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+Vulkan example", nullptr, nullptr);
     if (!glfwVulkanSupported())
     {
@@ -427,10 +428,11 @@ int main(int, char**)
     IMGUI_CHECKVERSION();
     ImGui::CreateContext();
     ImGuiIO& io = ImGui::GetIO(); (void)io;
-    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
+    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;      // Enable Keyboard Controls
-    io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
+    io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;       // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // Enable Docking
+    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;          // Enable Docking
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;       // Enable Multi-Viewport / Platform Windows
+    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;        // Enable Multi-Viewport / Platform Windows
+    io.ConfigFlags |= ImGuiConfigFlags_TransparentBackbuffers; // Enable transparent backbuffer support
     //io.ConfigViewportsNoAutoMerge = true;
     //io.ConfigViewportsNoTaskBarIcon = true;
 
@@ -532,8 +534,9 @@ int main(int, char**)
             ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our window open/close state
             ImGui::Checkbox("Another Window", &show_another_window);
 
-            ImGui::SliderFloat("float", &f, 0.0f, 1.0f);            // Edit 1 float using a slider from 0.0f to 1.0f
+            ImGui::SliderFloat("Window Opacity", &ImGui::GetStyle().Colors[ImGuiCol_WindowBg].w, 0.0f, 1.0f); // Edit background window opacity (alpha channel)
-            ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
+            ImGui::ColorEdit4("clear color", (float*)&clear_color); // Edit 4 floats representing an RGBA color
+            clear_color.w = ImGui::GetStyle().Colors[ImGuiCol_WindowBg].w;
 
             if (ImGui::Button("Button"))                            // Buttons return true when clicked (most widgets return true when edited/activated)
                 counter++;

examples/libs/glfw/include/GLFW/glfw3native.h

@@ -1,9 +1,9 @@
 /*************************************************************************
- * GLFW 3.2 - www.glfw.org
+ * GLFW 3.3 - www.glfw.org
  * A library for OpenGL, window and input
  *------------------------------------------------------------------------
  * Copyright (c) 2002-2006 Marcus Geelnard
- * Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
+ * Copyright (c) 2006-2018 Camilla Löwy <elmindreda@glfw.org>
  *
  * This software is provided 'as-is', without any express or implied
  * warranty. In no event will the authors be held liable for any damages
@@ -45,12 +45,13 @@ extern "C" {
  *  more information.
  */
 /*! @defgroup native Native access
+ *  @brief Functions related to accessing native handles.
  *
  *  **By using the native access functions you assert that you know what you're
  *  doing and how to fix problems caused by using them.  If you don't, you
  *  shouldn't be using them.**
  *
- *  Before the inclusion of @ref glfw3native.h, you may define exactly one
+ *  Before the inclusion of @ref glfw3native.h, you may define zero or more
  *  window system API macro and zero or more context creation API macros.
  *
  *  The chosen backends must match those the library was compiled for.  Failure
@@ -61,13 +62,13 @@ extern "C" {
  *  * `GLFW_EXPOSE_NATIVE_COCOA`
  *  * `GLFW_EXPOSE_NATIVE_X11`
  *  * `GLFW_EXPOSE_NATIVE_WAYLAND`
- *  * `GLFW_EXPOSE_NATIVE_MIR`
  *
  *  The available context API macros are:
  *  * `GLFW_EXPOSE_NATIVE_WGL`
  *  * `GLFW_EXPOSE_NATIVE_NSGL`
  *  * `GLFW_EXPOSE_NATIVE_GLX`
  *  * `GLFW_EXPOSE_NATIVE_EGL`
+ *  * `GLFW_EXPOSE_NATIVE_OSMESA`
  *
  *  These macros select which of the native access functions that are declared
  *  and which platform-specific headers to include.  It is then up your (by
@@ -80,26 +81,27 @@ extern "C" {
  * System headers and types
  *************************************************************************/
 
-#if defined(GLFW_EXPOSE_NATIVE_WIN32)
+#if defined(GLFW_EXPOSE_NATIVE_WIN32) || defined(GLFW_EXPOSE_NATIVE_WGL)
  // This is a workaround for the fact that glfw3.h needs to export APIENTRY (for
  // example to allow applications to correctly declare a GL_ARB_debug_output
  // callback) but windows.h assumes no one will define APIENTRY before it does
- #undef APIENTRY
+ #if defined(GLFW_APIENTRY_DEFINED)
+  #undef APIENTRY
+  #undef GLFW_APIENTRY_DEFINED
+ #endif
  #include <windows.h>
-#elif defined(GLFW_EXPOSE_NATIVE_COCOA)
+#elif defined(GLFW_EXPOSE_NATIVE_COCOA) || defined(GLFW_EXPOSE_NATIVE_NSGL)
- #include <ApplicationServices/ApplicationServices.h>
  #if defined(__OBJC__)
   #import <Cocoa/Cocoa.h>
  #else
+  #include <ApplicationServices/ApplicationServices.h>
   typedef void* id;
  #endif
-#elif defined(GLFW_EXPOSE_NATIVE_X11)
+#elif defined(GLFW_EXPOSE_NATIVE_X11) || defined(GLFW_EXPOSE_NATIVE_GLX)
  #include <X11/Xlib.h>
  #include <X11/extensions/Xrandr.h>
 #elif defined(GLFW_EXPOSE_NATIVE_WAYLAND)
  #include <wayland-client.h>
-#elif defined(GLFW_EXPOSE_NATIVE_MIR)
- #include <mir_toolkit/mir_client_library.h>
 #endif
 
 #if defined(GLFW_EXPOSE_NATIVE_WGL)
@@ -114,6 +116,9 @@ extern "C" {
 #if defined(GLFW_EXPOSE_NATIVE_EGL)
  #include <EGL/egl.h>
 #endif
+#if defined(GLFW_EXPOSE_NATIVE_OSMESA)
+ #include <GL/osmesa.h>
+#endif
 
 
 /*************************************************************************
@@ -284,6 +289,56 @@ GLFWAPI RROutput glfwGetX11Monitor(GLFWmonitor* monitor);
  *  @ingroup native
  */
 GLFWAPI Window glfwGetX11Window(GLFWwindow* window);
+
+/*! @brief Sets the current primary selection to the specified string.
+ *
+ *  @param[in] string A UTF-8 encoded string.
+ *
+ *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
+ *  GLFW_PLATFORM_ERROR.
+ *
+ *  @pointer_lifetime The specified string is copied before this function
+ *  returns.
+ *
+ *  @thread_safety This function must only be called from the main thread.
+ *
+ *  @sa @ref clipboard
+ *  @sa glfwGetX11SelectionString
+ *  @sa glfwSetClipboardString
+ *
+ *  @since Added in version 3.3.
+ *
+ *  @ingroup native
+ */
+GLFWAPI void glfwSetX11SelectionString(const char* string);
+
+/*! @brief Returns the contents of the current primary selection as a string.
+ *
+ *  If the selection is empty or if its contents cannot be converted, `NULL`
+ *  is returned and a @ref GLFW_FORMAT_UNAVAILABLE error is generated.
+ *
+ *  @return The contents of the selection as a UTF-8 encoded string, or `NULL`
+ *  if an [error](@ref error_handling) occurred.
+ *
+ *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
+ *  GLFW_PLATFORM_ERROR.
+ *
+ *  @pointer_lifetime The returned string is allocated and freed by GLFW. You
+ *  should not free it yourself. It is valid until the next call to @ref
+ *  glfwGetX11SelectionString or @ref glfwSetX11SelectionString, or until the
+ *  library is terminated.
+ *
+ *  @thread_safety This function must only be called from the main thread.
+ *
+ *  @sa @ref clipboard
+ *  @sa glfwSetX11SelectionString
+ *  @sa glfwGetClipboardString
+ *
+ *  @since Added in version 3.3.
+ *
+ *  @ingroup native
+ */
+GLFWAPI const char* glfwGetX11SelectionString(void);
 #endif
 
 #if defined(GLFW_EXPOSE_NATIVE_GLX)
@@ -360,50 +415,6 @@ GLFWAPI struct wl_output* glfwGetWaylandMonitor(GLFWmonitor* monitor);
 GLFWAPI struct wl_surface* glfwGetWaylandWindow(GLFWwindow* window);
 #endif
 
-#if defined(GLFW_EXPOSE_NATIVE_MIR)
-/*! @brief Returns the `MirConnection*` used by GLFW.
- *
- *  @return The `MirConnection*` used by GLFW, or `NULL` if an
- *  [error](@ref error_handling) occurred.
- *
- *  @thread_safety This function may be called from any thread.  Access is not
- *  synchronized.
- *
- *  @since Added in version 3.2.
- *
- *  @ingroup native
- */
-GLFWAPI MirConnection* glfwGetMirDisplay(void);
-
-/*! @brief Returns the Mir output ID of the specified monitor.
- *
- *  @return The Mir output ID of the specified monitor, or zero if an
- *  [error](@ref error_handling) occurred.
- *
- *  @thread_safety This function may be called from any thread.  Access is not
- *  synchronized.
- *
- *  @since Added in version 3.2.
- *
- *  @ingroup native
- */
-GLFWAPI int glfwGetMirMonitor(GLFWmonitor* monitor);
-
-/*! @brief Returns the `MirSurface*` of the specified window.
- *
- *  @return The `MirSurface*` of the specified window, or `NULL` if an
- *  [error](@ref error_handling) occurred.
- *
- *  @thread_safety This function may be called from any thread.  Access is not
- *  synchronized.
- *
- *  @since Added in version 3.2.
- *
- *  @ingroup native
- */
-GLFWAPI MirSurface* glfwGetMirWindow(GLFWwindow* window);
-#endif
-
 #if defined(GLFW_EXPOSE_NATIVE_EGL)
 /*! @brief Returns the `EGLDisplay` used by GLFW.
  *
@@ -448,6 +459,64 @@ GLFWAPI EGLContext glfwGetEGLContext(GLFWwindow* window);
 GLFWAPI EGLSurface glfwGetEGLSurface(GLFWwindow* window);
 #endif
 
+#if defined(GLFW_EXPOSE_NATIVE_OSMESA)
+/*! @brief Retrieves the color buffer associated with the specified window.
+ *
+ *  @param[in] window The window whose color buffer to retrieve.
+ *  @param[out] width Where to store the width of the color buffer, or `NULL`.
+ *  @param[out] height Where to store the height of the color buffer, or `NULL`.
+ *  @param[out] format Where to store the OSMesa pixel format of the color
+ *  buffer, or `NULL`.
+ *  @param[out] buffer Where to store the address of the color buffer, or
+ *  `NULL`.
+ *  @return `GLFW_TRUE` if successful, or `GLFW_FALSE` if an
+ *  [error](@ref error_handling) occurred.
+ *
+ *  @thread_safety This function may be called from any thread.  Access is not
+ *  synchronized.
+ *
+ *  @since Added in version 3.3.
+ *
+ *  @ingroup native
+ */
+GLFWAPI int glfwGetOSMesaColorBuffer(GLFWwindow* window, int* width, int* height, int* format, void** buffer);
+
+/*! @brief Retrieves the depth buffer associated with the specified window.
+ *
+ *  @param[in] window The window whose depth buffer to retrieve.
+ *  @param[out] width Where to store the width of the depth buffer, or `NULL`.
+ *  @param[out] height Where to store the height of the depth buffer, or `NULL`.
+ *  @param[out] bytesPerValue Where to store the number of bytes per depth
+ *  buffer element, or `NULL`.
+ *  @param[out] buffer Where to store the address of the depth buffer, or
+ *  `NULL`.
+ *  @return `GLFW_TRUE` if successful, or `GLFW_FALSE` if an
+ *  [error](@ref error_handling) occurred.
+ *
+ *  @thread_safety This function may be called from any thread.  Access is not
+ *  synchronized.
+ *
+ *  @since Added in version 3.3.
+ *
+ *  @ingroup native
+ */
+GLFWAPI int glfwGetOSMesaDepthBuffer(GLFWwindow* window, int* width, int* height, int* bytesPerValue, void** buffer);
+
+/*! @brief Returns the `OSMesaContext` of the specified window.
+ *
+ *  @return The `OSMesaContext` of the specified window, or `NULL` if an
+ *  [error](@ref error_handling) occurred.
+ *
+ *  @thread_safety This function may be called from any thread.  Access is not
+ *  synchronized.
+ *
+ *  @since Added in version 3.3.
+ *
+ *  @ingroup native
+ */
+GLFWAPI OSMesaContext glfwGetOSMesaContext(GLFWwindow* window);
+#endif
+
 #ifdef __cplusplus
 }
 #endif

imgui.cpp

@@ -6663,7 +6663,9 @@ void ImGui::RenderWindowDecorations(ImGuiWindow* window, const ImRect& title_bar
             ImU32 bg_col = GetColorU32(GetWindowBgColorIdx(window));
             if (window->ViewportOwned)
             {
-                bg_col |= IM_COL32_A_MASK; // No alpha
+                if (!(g.IO.ConfigFlags & ImGuiConfigFlags_TransparentBackbuffers)) {
+                    bg_col |= IM_COL32_A_MASK; // No alpha
+                }
                 if (is_docking_transparent_payload)
                     window->Viewport->Alpha *= DOCKING_TRANSPARENT_PAYLOAD_ALPHA;
             }
@@ -15694,7 +15696,7 @@ void ImGui::WindowSyncOwnedViewport(ImGuiWindow* window, ImGuiWindow* parent_win
     // We can also tell the backend that clearing the platform window won't be necessary,
     // as our window background is filling the viewport and we have disabled BgAlpha.
     // FIXME: Work on support for per-viewport transparency (#2766)
-    if (!(window_flags & ImGuiWindowFlags_NoBackground))
+    if (!(window_flags & ImGuiWindowFlags_NoBackground) && !(g.ConfigFlagsCurrFrame & ImGuiConfigFlags_TransparentBackbuffers))
         viewport_flags |= ImGuiViewportFlags_NoRendererClear;
 
     window->Viewport->Flags = viewport_flags;

imgui.h

@@ -1660,6 +1660,7 @@ enum ImGuiConfigFlags_
     ImGuiConfigFlags_ViewportsEnable        = 1 << 10,  // Viewport enable flags (require both ImGuiBackendFlags_PlatformHasViewports + ImGuiBackendFlags_RendererHasViewports set by the respective backends)
     ImGuiConfigFlags_DpiEnableScaleViewports= 1 << 14,  // [BETA: Don't use] FIXME-DPI: Reposition and resize imgui windows when the DpiScale of a viewport changed (mostly useful for the main viewport hosting other window). Note that resizing the main window itself is up to your application.
     ImGuiConfigFlags_DpiEnableScaleFonts    = 1 << 15,  // [BETA: Don't use] FIXME-DPI: Request bitmap-scaled fonts to match DpiScale. This is a very low-quality workaround. The correct way to handle DPI is _currently_ to replace the atlas and/or fonts in the Platform_OnChangedViewport callback, but this is all early work in progress.
+    ImGuiConfigFlags_TransparentBackbuffers = 1 << 16,  // [BETA] Enables support for transparent backbuffers for native windows
 
     // User storage (to allow your backend/engine to communicate to code that may be shared between multiple projects. Those flags are NOT used by core Dear ImGui)
     ImGuiConfigFlags_IsSRGB                 = 1 << 20,  // Application is SRGB-aware.

imgui_demo.cpp

@@ -536,6 +536,8 @@ void ImGui::ShowDemoWindow(bool* p_open)
             ImGui::SameLine(); HelpMarker("Instruct backend to not alter mouse cursor shape and visibility.");
             ImGui::CheckboxFlags("io.ConfigFlags: NoKeyboard", &io.ConfigFlags, ImGuiConfigFlags_NoKeyboard);
             ImGui::SameLine(); HelpMarker("Instruct dear imgui to disable keyboard inputs and interactions.");
+            ImGui::CheckboxFlags("io.ConfigFlags: TransparentBackbuffers", &io.ConfigFlags, ImGuiConfigFlags_TransparentBackbuffers);
+            ImGui::SameLine(); HelpMarker("Enables or disables support for transparent background buffers. Note that platform support is not guaranteed!");
 
             ImGui::Checkbox("io.ConfigInputTrickleEventQueue", &io.ConfigInputTrickleEventQueue);
             ImGui::SameLine(); HelpMarker("Enable input queue trickling: some types of events submitted during the same frame (e.g. button down + up) will be spread over multiple frames, improving interactions with low framerates.");