Improve handling of rendering startup errors

platform/android/display_server_android.cpp

@@ -607,6 +607,7 @@ DisplayServerAndroid::DisplayServerAndroid(const String &p_rendering_driver, Dis
 			ERR_PRINT(vformat("Failed to initialize %s context", rendering_driver));
 			memdelete(rendering_context);
 			rendering_context = nullptr;
+			r_error = ERR_UNAVAILABLE;
 			return;
 		}
 
@@ -627,6 +628,7 @@ DisplayServerAndroid::DisplayServerAndroid(const String &p_rendering_driver, Dis
 			ERR_PRINT(vformat("Failed to create %s window.", rendering_driver));
 			memdelete(rendering_context);
 			rendering_context = nullptr;
+			r_error = ERR_UNAVAILABLE;
 			return;
 		}
 
@@ -635,7 +637,13 @@ DisplayServerAndroid::DisplayServerAndroid(const String &p_rendering_driver, Dis
 		rendering_context->window_set_vsync_mode(MAIN_WINDOW_ID, p_vsync_mode);
 
 		rendering_device = memnew(RenderingDevice);
-		rendering_device->initialize(rendering_context, MAIN_WINDOW_ID);
+		if (rendering_device->initialize(rendering_context, MAIN_WINDOW_ID) != OK) {
+			rendering_device = nullptr;
+			memdelete(rendering_context);
+			rendering_context = nullptr;
+			r_error = ERR_UNAVAILABLE;
+			return;
+		}
 		rendering_device->screen_create(MAIN_WINDOW_ID);
 
 		RendererCompositorRD::make_current();

platform/ios/display_server_ios.mm

@@ -91,6 +91,7 @@ DisplayServerIOS::DisplayServerIOS(const String &p_rendering_driver, WindowMode
 			ERR_PRINT(vformat("Failed to initialize %s context", rendering_driver));
 			memdelete(rendering_context);
 			rendering_context = nullptr;
+			r_error = ERR_UNAVAILABLE;
 			return;
 		}
 
@@ -107,7 +108,13 @@ DisplayServerIOS::DisplayServerIOS(const String &p_rendering_driver, WindowMode
 		rendering_context->window_set_vsync_mode(MAIN_WINDOW_ID, p_vsync_mode);
 
 		rendering_device = memnew(RenderingDevice);
-		rendering_device->initialize(rendering_context, MAIN_WINDOW_ID);
+		if (rendering_device->initialize(rendering_context, MAIN_WINDOW_ID) != OK) {
+			rendering_device = nullptr;
+			memdelete(rendering_context);
+			rendering_context = nullptr;
+			r_error = ERR_UNAVAILABLE;
+			return;
+		}
 		rendering_device->screen_create(MAIN_WINDOW_ID);
 
 		RendererCompositorRD::make_current();

platform/linuxbsd/wayland/display_server_wayland.cpp

@@ -1469,7 +1469,14 @@ DisplayServerWayland::DisplayServerWayland(const String &p_rendering_driver, Win
 #ifdef RD_ENABLED
 	if (rendering_context) {
 		rendering_device = memnew(RenderingDevice);
-		rendering_device->initialize(rendering_context, MAIN_WINDOW_ID);
+		if (rendering_device->initialize(rendering_context, MAIN_WINDOW_ID) != OK) {
+			memdelete(rendering_device);
+			rendering_device = nullptr;
+			memdelete(rendering_context);
+			rendering_context = nullptr;
+			r_error = ERR_UNAVAILABLE;
+			return;
+		}
 		rendering_device->screen_create(MAIN_WINDOW_ID);
 
 		RendererCompositorRD::make_current();

platform/linuxbsd/x11/display_server_x11.cpp

@@ -6261,8 +6261,14 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 
 #if defined(RD_ENABLED)
 	if (rendering_context) {
-		rendering_device = memnew(RenderingDevice);
-		rendering_device->initialize(rendering_context, MAIN_WINDOW_ID);
+		if (rendering_device->initialize(rendering_context, MAIN_WINDOW_ID) != OK) {
+			memdelete(rendering_device);
+			rendering_device = nullptr;
+			memdelete(rendering_context);
+			rendering_context = nullptr;
+			r_error = ERR_UNAVAILABLE;
+			return;
+		}
 		rendering_device->screen_create(MAIN_WINDOW_ID);
 
 		RendererCompositorRD::make_current();

platform/windows/display_server_windows.cpp

@@ -5873,7 +5873,14 @@ DisplayServerWindows::DisplayServerWindows(const String &p_rendering_driver, Win
 #if defined(RD_ENABLED)
 	if (rendering_context) {
 		rendering_device = memnew(RenderingDevice);
-		rendering_device->initialize(rendering_context, MAIN_WINDOW_ID);
+		if (rendering_device->initialize(rendering_context, MAIN_WINDOW_ID) != OK) {
+			memdelete(rendering_device);
+			rendering_device = nullptr;
+			memdelete(rendering_context);
+			rendering_context = nullptr;
+			r_error = ERR_UNAVAILABLE;
+			return;
+		}
 		rendering_device->screen_create(MAIN_WINDOW_ID);
 
 		RendererCompositorRD::make_current();

servers/rendering/rendering_device.cpp

@@ -5507,7 +5507,7 @@ Error RenderingDevice::initialize(RenderingContextDriver *p_context, DisplayServ
 	for (uint32_t i = 0; i < frames.size(); i++) {
 		// Staging was never used, create a block.
 		err = _insert_staging_block();
-		ERR_CONTINUE(err != OK);
+		ERR_FAIL_COND_V(err, FAILED);
 	}
 
 	draw_list = nullptr;