Enable fallback from ANGLE to native and improve ANGLE error messages.

doc/classes/ProjectSettings.xml

@@ -2526,8 +2526,8 @@
 			[b]Note:[/b] This setting is implemented only on Linux/X11.
 		</member>
 		<member name="rendering/gl_compatibility/fallback_to_native" type="bool" setter="" getter="" default="true">
-			If [code]true[/code], the compatibility renderer will fall back to native OpenGL if ANGLE over Metal is not supported.
-			[b]Note:[/b] This setting is implemented only on macOS.
+			If [code]true[/code], the compatibility renderer will fall back to native OpenGL if ANGLE is not supported, or ANGLE dynamic libraries aren't found.
+			[b]Note:[/b] This setting is implemented on macOS and Windows.
 		</member>
 		<member name="rendering/gl_compatibility/force_angle_on_devices" type="Array" setter="" getter="">
 			An [Array] of devices which should always use the ANGLE renderer.

drivers/egl/egl_manager.cpp

@@ -357,7 +357,7 @@ Error EGLManager::initialize(void *p_native_display) {
 	// have to temporarily get a proper display and reload EGL once again to
 	// initialize everything else.
 	if (!gladLoaderLoadEGL(EGL_NO_DISPLAY)) {
-		ERR_FAIL_V_MSG(ERR_UNAVAILABLE, "Can't load EGL.");
+		ERR_FAIL_V_MSG(ERR_UNAVAILABLE, "Can't load EGL dynamic library.");
 	}
 
 	EGLDisplay tmp_display = EGL_NO_DISPLAY;
@@ -387,7 +387,7 @@ Error EGLManager::initialize(void *p_native_display) {
 	int version = gladLoaderLoadEGL(tmp_display);
 	if (!version) {
 		eglTerminate(tmp_display);
-		ERR_FAIL_V_MSG(ERR_UNAVAILABLE, "Can't load EGL.");
+		ERR_FAIL_V_MSG(ERR_UNAVAILABLE, "Can't load EGL dynamic library.");
 	}
 
 	int major = GLAD_VERSION_MAJOR(version);

platform/macos/display_server_macos.mm

@@ -3609,7 +3609,11 @@ DisplayServerMacOS::DisplayServerMacOS(const String &p_rendering_driver, WindowM
 			gl_manager_angle = nullptr;
 			bool fallback = GLOBAL_GET("rendering/gl_compatibility/fallback_to_native");
 			if (fallback) {
-				WARN_PRINT("Your video card drivers seem not to support the required Metal version, switching to native OpenGL.");
+#ifdef EGL_STATIC
+				WARN_PRINT("Your video card drivers seem not to support GLES3 / ANGLE, switching to native OpenGL.");
+#else
+				WARN_PRINT("Your video card drivers seem not to support GLES3 / ANGLE or ANGLE dynamic libraries (libEGL.dylib and libGLESv2.dylib) are missing, switching to native OpenGL.");
+#endif
 				rendering_driver = "opengl3";
 			} else {
 				r_error = ERR_UNAVAILABLE;

platform/windows/display_server_windows.cpp

@@ -6183,10 +6183,12 @@ DisplayServerWindows::DisplayServerWindows(const String &p_rendering_driver, Win
 #endif
 	}
 
+	bool gl_supported = true;
 	if (fallback && (rendering_driver == "opengl3")) {
 		Dictionary gl_info = detect_wgl();
 
 		bool force_angle = false;
+		gl_supported = gl_info["version"].operator int() >= 30003;
 
 		Vector2i device_id = _get_device_ids(gl_info["name"]);
 		Array device_list = GLOBAL_GET("rendering/gl_compatibility/force_angle_on_devices");
@@ -6210,12 +6212,37 @@ DisplayServerWindows::DisplayServerWindows(const String &p_rendering_driver, Win
 		if (force_angle || (gl_info["version"].operator int() < 30003)) {
 			tested_drivers.set_flag(DRIVER_ID_COMPAT_OPENGL3);
 			if (show_warning) {
-				WARN_PRINT("Your video card drivers seem not to support the required OpenGL 3.3 version, switching to ANGLE.");
+				if (gl_info["version"].operator int() < 30003) {
+					WARN_PRINT("Your video card drivers seem not to support the required OpenGL 3.3 version, switching to ANGLE.");
+				} else {
+					WARN_PRINT("Your video card drivers are known to have low quality OpenGL 3.3 support, switching to ANGLE.");
+				}
 			}
 			rendering_driver = "opengl3_angle";
 		}
 	}
 
+	if (rendering_driver == "opengl3_angle") {
+		gl_manager_angle = memnew(GLManagerANGLE_Windows);
+		tested_drivers.set_flag(DRIVER_ID_COMPAT_ANGLE_D3D11);
+
+		if (gl_manager_angle->initialize() != OK) {
+			memdelete(gl_manager_angle);
+			gl_manager_angle = nullptr;
+			bool fallback_to_native = GLOBAL_GET("rendering/gl_compatibility/fallback_to_native");
+			if (fallback_to_native && gl_supported) {
+#ifdef EGL_STATIC
+				WARN_PRINT("Your video card drivers seem not to support GLES3 / ANGLE, switching to native OpenGL.");
+#else
+				WARN_PRINT("Your video card drivers seem not to support GLES3 / ANGLE or ANGLE dynamic libraries (libEGL.dll and libGLESv2.dll) are missing, switching to native OpenGL.");
+#endif
+				rendering_driver = "opengl3";
+			} else {
+				r_error = ERR_UNAVAILABLE;
+				ERR_FAIL_MSG("Could not initialize ANGLE OpenGL.");
+			}
+		}
+	}
 	if (rendering_driver == "opengl3") {
 		gl_manager_native = memnew(GLManagerNative_Windows);
 		tested_drivers.set_flag(DRIVER_ID_COMPAT_OPENGL3);
@@ -6224,26 +6251,17 @@ DisplayServerWindows::DisplayServerWindows(const String &p_rendering_driver, Win
 			memdelete(gl_manager_native);
 			gl_manager_native = nullptr;
 			r_error = ERR_UNAVAILABLE;
-			return;
+			ERR_FAIL_MSG("Could not initialize native OpenGL.");
 		}
+	}
 
+	if (rendering_driver == "opengl3") {
 		RasterizerGLES3::make_current(true);
 	}
 	if (rendering_driver == "opengl3_angle") {
-		gl_manager_angle = memnew(GLManagerANGLE_Windows);
-		tested_drivers.set_flag(DRIVER_ID_COMPAT_ANGLE_D3D11);
-
-		if (gl_manager_angle->initialize() != OK) {
-			memdelete(gl_manager_angle);
-			gl_manager_angle = nullptr;
-			r_error = ERR_UNAVAILABLE;
-			return;
-		}
-
 		RasterizerGLES3::make_current(false);
 	}
 #endif
-
 	String appname;
 	if (Engine::get_singleton()->is_editor_hint()) {
 		appname = "Godot.GodotEditor." + String(VERSION_FULL_CONFIG);