[Windows] Read Wacom config to check if Windows Ink is disabled and auto switch to WinTab.

doc/classes/ProjectSettings.xml

@@ -1429,9 +1429,14 @@
 		<member name="input_devices/pen_tablet/driver" type="String" setter="" getter="">
 			Specifies the tablet driver to use. If left empty, the default driver will be used.
 			[b]Note:[/b] The driver in use can be overridden at runtime via the [code]--tablet-driver[/code] [url=$DOCS_URL/tutorials/editor/command_line_tutorial.html]command line argument[/url].
+			[b]Note:[/b] Use [method DisplayServer.tablet_set_current_driver] to switch tablet driver in runtime.
 		</member>
 		<member name="input_devices/pen_tablet/driver.windows" type="String" setter="" getter="">
-			Override for [member input_devices/pen_tablet/driver] on Windows.
+			Override for [member input_devices/pen_tablet/driver] on Windows. Supported values are:
+			- [code]auto[/code] (default), uses [code]wintab[/code] if Windows Ink is disabled in the Wacom Tablet Properties or system settings, [code]winink[/code] otherwise.
+			- [code]winink[/code], uses Windows native "Windows Ink" driver.
+			- [code]wintab[/code], uses Wacom "WinTab" driver.
+			- [code]dummy[/code], tablet input is disabled.
 		</member>
 		<member name="input_devices/pointing/android/enable_long_press_as_right_click" type="bool" setter="" getter="" default="false">
 			If [code]true[/code], long press events on an Android touchscreen are transformed into right click events.

main/main.cpp

@@ -3121,7 +3121,7 @@ Error Main::setup2(bool p_show_boot_logo) {
 		OS::get_singleton()->benchmark_begin_measure("Servers", "Tablet Driver");
 
 		GLOBAL_DEF_RST_NOVAL("input_devices/pen_tablet/driver", "");
-		GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "input_devices/pen_tablet/driver.windows", PROPERTY_HINT_ENUM, "winink,wintab,dummy"), "");
+		GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "input_devices/pen_tablet/driver.windows", PROPERTY_HINT_ENUM, "auto,winink,wintab,dummy"), "");
 
 		if (tablet_driver.is_empty()) { // specified in project.godot
 			tablet_driver = GLOBAL_GET("input_devices/pen_tablet/driver");
@@ -3141,7 +3141,7 @@ Error Main::setup2(bool p_show_boot_logo) {
 			DisplayServer::get_singleton()->tablet_set_current_driver(DisplayServer::get_singleton()->tablet_get_driver_name(0));
 		}
 
-		print_verbose("Using \"" + tablet_driver + "\" pen tablet driver...");
+		print_verbose("Using \"" + DisplayServer::get_singleton()->tablet_get_current_driver() + "\" pen tablet driver...");
 
 		OS::get_singleton()->benchmark_end_measure("Servers", "Tablet Driver");
 	}

platform/windows/display_server_windows.cpp

@@ -36,6 +36,7 @@
 
 #include "core/config/project_settings.h"
 #include "core/io/marshalls.h"
+#include "core/io/xml_parser.h"
 #include "core/version.h"
 #include "drivers/png/png_driver_common.h"
 #include "main/main.h"
@@ -6528,15 +6529,27 @@ void DisplayServerWindows::tablet_set_current_driver(const String &p_driver) {
 	if (tablet_get_driver_count() == 0) {
 		return;
 	}
+
+	String driver = p_driver;
+	if (driver == "auto") {
+		if (winink_available && !winink_disabled) {
+			driver = "winink";
+		} else if (wintab_available) {
+			driver = "wintab";
+		} else {
+			driver = "dummy";
+		}
+	}
+
 	bool found = false;
 	for (int i = 0; i < tablet_get_driver_count(); i++) {
-		if (p_driver == tablet_get_driver_name(i)) {
+		if (driver == tablet_get_driver_name(i)) {
 			found = true;
 		}
 	}
 	if (found) {
-		_update_tablet_ctx(tablet_driver, p_driver);
-		tablet_driver = p_driver;
+		_update_tablet_ctx(tablet_driver, driver);
+		tablet_driver = driver;
 	} else {
 		ERR_PRINT("Unknown tablet driver " + p_driver + ".");
 	}
@@ -6635,6 +6648,8 @@ DisplayServerWindows::DisplayServerWindows(const String &p_rendering_driver, Win
 		}
 	}
 
+	tablet_drivers.push_back("auto");
+
 	// Note: Windows Ink API for pen input, available on Windows 8+ only.
 	// Note: DPI conversion API, available on Windows 8.1+ only.
 	HMODULE user32_lib = LoadLibraryW(L"user32.dll");
@@ -6669,6 +6684,27 @@ DisplayServerWindows::DisplayServerWindows(const String &p_rendering_driver, Win
 
 	tablet_drivers.push_back("dummy");
 
+	String wacom_cfg = OS::get_singleton()->get_config_path().path_join("WTablet").path_join("Wacom_Tablet.dat");
+	if (FileAccess::exists(wacom_cfg)) {
+		Ref<XMLParser> parser;
+		parser.instantiate();
+		if (parser->open(wacom_cfg) == OK) {
+			while (parser->read() == OK) {
+				if (parser->get_node_type() != XMLParser::NODE_ELEMENT) {
+					continue;
+				}
+				if (parser->get_node_name() == "WinUseInk") {
+					parser->read();
+					if (parser->get_node_type() == XMLParser::NODE_TEXT) {
+						winink_disabled = (parser->get_node_data().to_lower().strip_edges() != "true");
+						print_verbose(vformat("Wacom tablet config found at \"%s\", Windows Ink support is %s.", wacom_cfg, winink_disabled ? "disabled" : "enabled"));
+						break;
+					}
+				}
+			}
+		}
+	}
+
 	if (OS::get_singleton()->is_hidpi_allowed()) {
 		HMODULE Shcore = LoadLibraryW(L"Shcore.dll");
 

platform/windows/display_server_windows.h

@@ -405,6 +405,7 @@ class DisplayServerWindows : public DisplayServer {
 	void _update_tablet_ctx(const String &p_old_driver, const String &p_new_driver);
 	String tablet_driver;
 	Vector<String> tablet_drivers;
+	bool winink_disabled = false;
 
 	enum DriverID {
 		DRIVER_ID_COMPAT_OPENGL3 = 1 << 0,