Add audio/general/text_to_speech project setting to enable/disable TTS.

core/config/project_settings.cpp

@@ -1080,6 +1080,8 @@ ProjectSettings::ProjectSettings() {
 	ProjectSettings::get_singleton()->set_custom_property_info("audio/general/ios/session_category", PropertyInfo(Variant::INT, "audio/general/ios/session_category", PROPERTY_HINT_ENUM, "Ambient,Multi Route,Play and Record,Playback,Record,Solo Ambient"));
 	GLOBAL_DEF("audio/general/ios/mix_with_others", false);
 
+	GLOBAL_DEF_RST("audio/general/text_to_speech", false);
+
 	PoolStringArray extensions = PoolStringArray();
 	extensions.push_back("gd");
 	extensions.push_back("gdshader");

doc/classes/OS.xml

@@ -1131,6 +1131,7 @@
 				- [code]id[/code] is voice identifier.
 				- [code]language[/code] is language code in [code]lang_Variant[/code] format. [code]lang[/code] part is a 2 or 3-letter code based on the ISO-639 standard, in lowercase. And [code]Variant[/code] part is an engine dependent string describing country, region or/and dialect.
 				[b]Note:[/b] This method is implemented on Android, iOS, HTML5, Linux, macOS, and Windows.
+				[b]Note:[/b] [member ProjectSettings.audio/general/text_to_speech] should be [code]true[/code] to use text-to-speech.
 			</description>
 		</method>
 		<method name="tts_get_voices_for_language" qualifiers="const">
@@ -1139,6 +1140,7 @@
 			<description>
 				Returns an [PoolStringArray] of voice identifiers for the [code]language[/code].
 				[b]Note:[/b] This method is implemented on Android, iOS, HTML5, Linux, macOS, and Windows.
+				[b]Note:[/b] [member ProjectSettings.audio/general/text_to_speech] should be [code]true[/code] to use text-to-speech.
 			</description>
 		</method>
 		<method name="tts_is_paused" qualifiers="const">
@@ -1146,6 +1148,7 @@
 			<description>
 				Returns [code]true[/code] if the synthesizer is in a paused state.
 				[b]Note:[/b] This method is implemented on Android, iOS, HTML5, Linux, macOS, and Windows.
+				[b]Note:[/b] [member ProjectSettings.audio/general/text_to_speech] should be [code]true[/code] to use text-to-speech.
 			</description>
 		</method>
 		<method name="tts_is_speaking" qualifiers="const">
@@ -1153,6 +1156,7 @@
 			<description>
 				Returns [code]true[/code] if the synthesizer is generating speech, or have utterance waiting in the queue.
 				[b]Note:[/b] This method is implemented on Android, iOS, HTML5, Linux, macOS, and Windows.
+				[b]Note:[/b] [member ProjectSettings.audio/general/text_to_speech] should be [code]true[/code] to use text-to-speech.
 			</description>
 		</method>
 		<method name="tts_pause">
@@ -1160,6 +1164,7 @@
 			<description>
 				Puts the synthesizer into a paused state.
 				[b]Note:[/b] This method is implemented on Android, iOS, HTML5, Linux, macOS, and Windows.
+				[b]Note:[/b] [member ProjectSettings.audio/general/text_to_speech] should be [code]true[/code] to use text-to-speech.
 			</description>
 		</method>
 		<method name="tts_resume">
@@ -1167,6 +1172,7 @@
 			<description>
 				Resumes the synthesizer if it was paused.
 				[b]Note:[/b] This method is implemented on Android, iOS, HTML5, Linux, macOS, and Windows.
+				[b]Note:[/b] [member ProjectSettings.audio/general/text_to_speech] should be [code]true[/code] to use text-to-speech.
 			</description>
 		</method>
 		<method name="tts_set_utterance_callback">
@@ -1180,6 +1186,7 @@
 				- [code]TTS_UTTERANCE_BOUNDARY[/code] callable's method should take two [int] parameters, the index of the character and the utterance id.
 				[b]Note:[/b] The granularity of the boundary callbacks is engine dependent.
 				[b]Note:[/b] This method is implemented on Android, iOS, HTML5, Linux, macOS, and Windows.
+				[b]Note:[/b] [member ProjectSettings.audio/general/text_to_speech] should be [code]true[/code] to use text-to-speech.
 			</description>
 		</method>
 		<method name="tts_speak">
@@ -1201,6 +1208,7 @@
 				[b]Note:[/b] On Windows and Linux, utterance [code]text[/code] can use SSML markup. SSML support is engine and voice dependent. If the engine does not support SSML, you should strip out all XML markup before calling [method tts_speak].
 				[b]Note:[/b] The granularity of pitch, rate, and volume is engine and voice dependent. Values may be truncated.
 				[b]Note:[/b] This method is implemented on Android, iOS, HTML5, Linux, macOS, and Windows.
+				[b]Note:[/b] [member ProjectSettings.audio/general/text_to_speech] should be [code]true[/code] to use text-to-speech.
 			</description>
 		</method>
 		<method name="tts_stop">
@@ -1208,6 +1216,7 @@
 			<description>
 				Stops synthesis in progress and removes all utterances from the queue.
 				[b]Note:[/b] This method is implemented on Android, iOS, HTML5, Linux, macOS, and Windows.
+				[b]Note:[/b] [member ProjectSettings.audio/general/text_to_speech] should be [code]true[/code] to use text-to-speech.
 			</description>
 		</method>
 	</methods>

doc/classes/ProjectSettings.xml

@@ -303,6 +303,10 @@
 		<member name="audio/general/ios/session_category" type="int" setter="" getter="" default="0">
 			Sets the [url=https://developer.apple.com/documentation/avfaudio/avaudiosessioncategory]AVAudioSessionCategory[/url] on iOS. Use the [code]Playback[/code] category to get sound output, even if the phone is in silent mode.
 		</member>
+		<member name="audio/general/text_to_speech" type="bool" setter="" getter="" default="false">
+			If [code]true[/code], text-to-speech support is enabled, see [method OS.tts_get_voices] and [method OS.tts_speak].
+			[b]Note:[/b] Enabling TTS can cause addition idle CPU usage and interfere with the sleep mode, so consider disabling it if TTS is not used.
+		</member>
 		<member name="audio/mix_rate" type="int" setter="" getter="" default="44100">
 			The mixing rate used for audio (in Hz). In general, it's better to not touch this and leave it to the host operating system.
 		</member>

platform/android/java/lib/src/org/pandemoniumengine/pandemonium/Pandemonium.java

@@ -457,7 +457,9 @@ public class Pandemonium extends Fragment implements SensorEventListener, IDownl
 
 		final String[] current_command_line = command_line;
 		mView.queueEvent(() -> {
-			if (!PandemoniumLib.setup(current_command_line)) {
+			tts = new PandemoniumTTS(activity);
+
+			if (!PandemoniumLib.setup(current_command_line, tts)) {
 				pandemonium_initialized = false;
 				Log.e(TAG, "Unable to setup the Pandemonium engine! Aborting...");
 				alert(R.string.error_engine_setup_message, R.string.text_error_title, this::forceQuit);
@@ -711,7 +713,6 @@ public class Pandemonium extends Fragment implements SensorEventListener, IDownl
 		final Activity activity = getActivity();
 		io = new PandemoniumIO(activity);
 		netUtils = new PandemoniumNetUtils(activity);
-		tts = new PandemoniumTTS(activity);
 
 		Context context = getContext();
 		directoryAccessHandler = new DirectoryAccessHandler(context);
@@ -723,7 +724,7 @@ public class Pandemonium extends Fragment implements SensorEventListener, IDownl
 		mMagnetometer = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
 		mGyroscope = mSensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
 
-		PandemoniumLib.initialize(activity, this, activity.getAssets(), io, netUtils, directoryAccessHandler, fileAccessHandler, use_apk_expansion, tts);
+		PandemoniumLib.initialize(activity, this, activity.getAssets(), io, netUtils, directoryAccessHandler, fileAccessHandler, use_apk_expansion);
 
 		result_callback = null;
 

platform/android/java/lib/src/org/pandemoniumengine/pandemonium/PandemoniumLib.java

@@ -53,7 +53,7 @@ public class PandemoniumLib {
 	/**
 	 * Invoked on the main thread to initialize Pandemonium native layer.
 	 */
-	public static native void initialize(Activity activity, Pandemonium p_instance, AssetManager p_asset_manager, PandemoniumIO pandemoniumIO, PandemoniumNetUtils netUtils, DirectoryAccessHandler directoryAccessHandler, FileAccessHandler fileAccessHandler, boolean use_apk_expansion, GodotTTS tts);
+	public static native void initialize(Activity activity, Pandemonium p_instance, AssetManager p_asset_manager, PandemoniumIO pandemoniumIO, PandemoniumNetUtils netUtils, DirectoryAccessHandler directoryAccessHandler, FileAccessHandler fileAccessHandler, boolean use_apk_expansion);
 
 	/**
 	 * Invoked on the main thread to clean up Pandemonium native layer.
@@ -65,7 +65,7 @@ public class PandemoniumLib {
 	 * Invoked on the GL thread to complete setup for the Pandemonium native layer logic.
 	 * @param p_cmdline Command line arguments used to configure Pandemonium native layer components.
 	 */
-	public static native boolean setup(String[] p_cmdline);
+	public static native boolean setup(String[] p_cmdline, PandemoniumTTS tts);
 
 	/**
 	 * Invoked on the GL thread when the underlying Android surface has changed size.

platform/android/java/lib/src/org/pandemoniumengine/pandemonium/tts/PandemoniumTTS.java

@@ -62,8 +62,9 @@ public class PandemoniumTTS extends UtteranceProgressListener {
 	final private static int EVENT_CANCEL = 2;
 	final private static int EVENT_BOUNDARY = 3;
 
-	final private TextToSpeech synth;
-	final private LinkedList<PandemoniumUtterance> queue;
+	final private Activity activity;
+	private TextToSpeech synth;
+	private LinkedList<PandemoniumUtterance> queue;
 	final private Object lock = new Object();
 	private PandemoniumUtterance lastUtterance;
 
@@ -71,10 +72,7 @@ public class PandemoniumTTS extends UtteranceProgressListener {
 	private boolean paused;
 
 	public PandemoniumTTS(Activity p_activity) {
-		synth = new TextToSpeech(p_activity, null);
-		queue = new LinkedList<PandemoniumUtterance>();
-
-		synth.setOnUtteranceProgressListener(this);
+		activity = p_activity;
 	}
 
 	private void updateTTS() {
@@ -186,6 +184,16 @@ public class PandemoniumTTS extends UtteranceProgressListener {
 		}
 	}
 
+	/**
+	 * Initialize synth and query.
+	 */
+	public void init() {
+		synth = new TextToSpeech(p_activity, null);
+		queue = new LinkedList<PandemoniumUtterance>();
+
+		synth.setOnUtteranceProgressListener(this);
+	}
+
 	/**
 	 * Adds an utterance to the queue.
 	 */

platform/android/java_pandemonium_lib_jni.cpp

@@ -160,7 +160,7 @@ JNIEXPORT void JNICALL Java_org_pandemoniumengine_pandemonium_PandemoniumLib_set
 	}
 }
 
-JNIEXPORT void JNICALL Java_org_pandemoniumengine_pandemonium_PandemoniumLib_initialize(JNIEnv *env, jclass clazz, jobject p_activity, jobject p_pandemonium_instance, jobject p_asset_manager, jobject p_pandemonium_io, jobject p_net_utils, jobject p_directory_access_handler, jobject p_file_access_handler, jboolean p_use_apk_expansion, jobject p_godot_tts) {
+JNIEXPORT void JNICALL Java_org_pandemoniumengine_pandemonium_PandemoniumLib_initialize(JNIEnv *env, jclass clazz, jobject p_activity, jobject p_pandemonium_instance, jobject p_asset_manager, jobject p_pandemonium_io, jobject p_net_utils, jobject p_directory_access_handler, jobject p_file_access_handler, jboolean p_use_apk_expansion) {
 	initialized = true;
 
 	JavaVM *jvm;
@@ -179,7 +179,6 @@ JNIEXPORT void JNICALL Java_org_pandemoniumengine_pandemonium_PandemoniumLib_ini
 	DirAccessJAndroid::setup(p_directory_access_handler);
 	FileAccessFilesystemJAndroid::setup(p_file_access_handler);
 	NetSocketAndroid::setup(p_net_utils);
-	TTS_Android::setup(p_godot_tts);
 
 	os_android = new OS_Android(pandemonium_java, pandemonium_io_java, p_use_apk_expansion);
 
@@ -193,7 +192,7 @@ JNIEXPORT void JNICALL Java_org_pandemoniumengine_pandemonium_PandemoniumLib_ond
 	_terminate(env, false);
 }
 
-JNIEXPORT jboolean JNICALL Java_org_pandemoniumengine_pandemonium_PandemoniumLib_setup(JNIEnv *env, jclass clazz, jobjectArray p_cmdline) {
+JNIEXPORT jboolean JNICALL Java_org_pandemoniumengine_pandemonium_PandemoniumLib_setup(JNIEnv *env, jclass clazz, jobjectArray p_cmdline, jobject p_godot_tts) {
 	setup_android_thread();
 
 	const char **cmdline = NULL;
@@ -234,7 +233,10 @@ JNIEXPORT jboolean JNICALL Java_org_pandemoniumengine_pandemonium_PandemoniumLib
 		return false;
 	}
 
+	TTS_Android::setup(p_godot_tts);
+
 	java_class_wrapper = memnew(JavaClassWrapper(pandemonium_java->get_activity()));
+
 	ClassDB::register_class<JNISingleton>();
 	_initialize_java_modules();
 	return true;

platform/android/tts_android.cpp

@@ -35,9 +35,11 @@
 #include "string_android.h"
 #include "thread_jandroid.h"
 
+bool TTS_Android::initialized = false;
 jobject TTS_Android::tts = 0;
 jclass TTS_Android::cls = 0;
 
+jmethodID TTS_Android::_init = 0;
 jmethodID TTS_Android::_is_speaking = 0;
 jmethodID TTS_Android::_is_paused = 0;
 jmethodID TTS_Android::_get_voices = 0;
@@ -99,23 +101,33 @@ Vector<char16_t> TTS_Android::str_to_utf16(const String &p_string) {
 }
 
 void TTS_Android::setup(jobject p_tts) {
-	JNIEnv *env = get_jni_env();
+	bool tts_enabled = GLOBAL_GET("audio/general/text_to_speech");
+	if (tts_enabled) {
+		JNIEnv *env = get_jni_env();
 
-	tts = env->NewGlobalRef(p_tts);
+		tts = env->NewGlobalRef(p_tts);
 
-	jclass c = env->GetObjectClass(tts);
-	cls = (jclass)env->NewGlobalRef(c);
+		jclass c = env->GetObjectClass(tts);
+		cls = (jclass)env->NewGlobalRef(c);
 
-	_is_speaking = env->GetMethodID(cls, "isSpeaking", "()Z");
-	_is_paused = env->GetMethodID(cls, "isPaused", "()Z");
-	_get_voices = env->GetMethodID(cls, "getVoices", "()[Ljava/lang/String;");
-	_speak = env->GetMethodID(cls, "speak", "(Ljava/lang/String;Ljava/lang/String;IFFIZ)V");
-	_pause_speaking = env->GetMethodID(cls, "pauseSpeaking", "()V");
-	_resume_speaking = env->GetMethodID(cls, "resumeSpeaking", "()V");
-	_stop_speaking = env->GetMethodID(cls, "stopSpeaking", "()V");
+		_init = env->GetMethodID(cls, "init", "()V");
+		_is_speaking = env->GetMethodID(cls, "isSpeaking", "()Z");
+		_is_paused = env->GetMethodID(cls, "isPaused", "()Z");
+		_get_voices = env->GetMethodID(cls, "getVoices", "()[Ljava/lang/String;");
+		_speak = env->GetMethodID(cls, "speak", "(Ljava/lang/String;Ljava/lang/String;IFFIZ)V");
+		_pause_speaking = env->GetMethodID(cls, "pauseSpeaking", "()V");
+		_resume_speaking = env->GetMethodID(cls, "resumeSpeaking", "()V");
+		_stop_speaking = env->GetMethodID(cls, "stopSpeaking", "()V");
+
+		if (_init) {
+			env->CallVoidMethod(tts, _init);
+			initialized = true;
+		}
+	}
 }
 
 void TTS_Android::_java_utterance_callback(int p_event, int p_id, int p_pos) {
+	ERR_FAIL_COND_MSG(!initialized, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	if (ids.has(p_id)) {
 		int pos = 0;
 		if ((OS::TTSUtteranceEvent)p_event == OS::TTS_UTTERANCE_BOUNDARY) {
@@ -136,6 +148,7 @@ void TTS_Android::_java_utterance_callback(int p_event, int p_id, int p_pos) {
 }
 
 bool TTS_Android::is_speaking() {
+	ERR_FAIL_COND_V_MSG(!initialized, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	if (_is_speaking) {
 		JNIEnv *env = get_jni_env();
 
@@ -147,6 +160,7 @@ bool TTS_Android::is_speaking() {
 }
 
 bool TTS_Android::is_paused() {
+	ERR_FAIL_COND_V_MSG(!initialized, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	if (_is_paused) {
 		JNIEnv *env = get_jni_env();
 
@@ -158,6 +172,7 @@ bool TTS_Android::is_paused() {
 }
 
 Array TTS_Android::get_voices() {
+	ERR_FAIL_COND_V_MSG(!initialized, Array(), "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	Array list;
 	if (_get_voices) {
 		JNIEnv *env = get_jni_env();
@@ -185,6 +200,7 @@ Array TTS_Android::get_voices() {
 }
 
 void TTS_Android::speak(const String &p_text, const String &p_voice, int p_volume, float p_pitch, float p_rate, int p_utterance_id, bool p_interrupt) {
+	ERR_FAIL_COND_MSG(!initialized, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	if (p_interrupt) {
 		stop();
 	}
@@ -207,6 +223,7 @@ void TTS_Android::speak(const String &p_text, const String &p_voice, int p_volum
 }
 
 void TTS_Android::pause() {
+	ERR_FAIL_COND_MSG(!initialized, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	if (_pause_speaking) {
 		JNIEnv *env = get_jni_env();
 
@@ -216,6 +233,7 @@ void TTS_Android::pause() {
 }
 
 void TTS_Android::resume() {
+	ERR_FAIL_COND_MSG(!initialized, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	if (_resume_speaking) {
 		JNIEnv *env = get_jni_env();
 
@@ -225,6 +243,7 @@ void TTS_Android::resume() {
 }
 
 void TTS_Android::stop() {
+	ERR_FAIL_COND_MSG(!initialized, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	const int *k = NULL;
 	while ((k = ids.next(k))) {
 		OS::get_singleton()->tts_post_utterance_event(OS::TTS_UTTERANCE_CANCELED, *k);

platform/android/tts_android.h

@@ -33,14 +33,17 @@
 
 #include "core/variant/array.h"
 #include "core/os/os.h"
+#include "core/config/project_settings.h"
 #include "core/string/ustring.h"
 
 #include <jni.h>
 
 class TTS_Android {
+	static bool initialized;
 	static jobject tts;
 	static jclass cls;
 
+	static jmethodID _init;
 	static jmethodID _is_speaking;
 	static jmethodID _is_paused;
 	static jmethodID _get_voices;

platform/iphone/os_iphone.mm

@@ -95,36 +95,43 @@ OSIPhone *OSIPhone::get_singleton() {
 };
 
 bool OSIPhone::tts_is_speaking() const {
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, false);
 	return [tts isSpeaking];
 }
 
 bool OSIPhone::tts_is_paused() const {
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, false);
 	return [tts isPaused];
 }
 
 Array OSIPhone::tts_get_voices() const {
+	ERR_FAIL_COND_V_MSG(!tts, Array(), "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, Array());
 	return [tts getVoices];
 }
 
 void OSIPhone::tts_speak(const String &p_text, const String &p_voice, int p_volume, float p_pitch, float p_rate, int p_utterance_id, bool p_interrupt) {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	[tts speak:p_text voice:p_voice volume:p_volume pitch:p_pitch rate:p_rate utterance_id:p_utterance_id interrupt:p_interrupt];
 }
 
 void OSIPhone::tts_pause() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	[tts pauseSpeaking];
 }
 
 void OSIPhone::tts_resume() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	[tts resumeSpeaking];
 }
 
 void OSIPhone::tts_stop() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	[tts stopSpeaking];
 }
@@ -225,7 +232,10 @@ Error OSIPhone::initialize(const VideoMode &p_desired, int p_video_driver, int p
 	}
 
 	// Init TTS
-	tts = [[TTS_IOS alloc] init];
+	bool tts_enabled = GLOBAL_GET("audio/general/text_to_speech");
+	if (tts_enabled) {
+		tts = [[TTS_IOS alloc] init];
+	}
 
 	rendering_server->init();
 	//rendering_server->cursor_set_visible(false, 0);

platform/javascript/os_javascript.cpp

@@ -32,6 +32,7 @@
 #include "os_javascript.h"
 
 #include "core/io/json.h"
+#include "core/project_settings.h"
 #include "drivers/gles2/rasterizer_gles2.h"
 #ifndef GLES3_DISABLED
 #include "drivers/gles3/rasterizer_gles3.h"
@@ -69,10 +70,12 @@ void OS_JavaScript::request_quit_callback() {
 }
 
 bool OS_JavaScript::tts_is_speaking() const {
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	return godot_js_tts_is_speaking();
 }
 
 bool OS_JavaScript::tts_is_paused() const {
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	return godot_js_tts_is_paused();
 }
 
@@ -91,11 +94,13 @@ void OS_JavaScript::update_voices_callback(int p_size, const char **p_voice) {
 }
 
 Array OS_JavaScript::tts_get_voices() const {
+	ERR_FAIL_COND_V_MSG(!tts, Array(), "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	godot_js_tts_get_voices(update_voices_callback);
 	return voices;
 }
 
 void OS_JavaScript::tts_speak(const String &p_text, const String &p_voice, int p_volume, float p_pitch, float p_rate, int p_utterance_id, bool p_interrupt) {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	if (p_interrupt) {
 		tts_stop();
 	}
@@ -112,14 +117,17 @@ void OS_JavaScript::tts_speak(const String &p_text, const String &p_voice, int p
 }
 
 void OS_JavaScript::tts_pause() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	godot_js_tts_pause();
 }
 
 void OS_JavaScript::tts_resume() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	godot_js_tts_resume();
 }
 
 void OS_JavaScript::tts_stop() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	for (Map<int, CharString>::Element *E = utterance_ids.front(); E; E = E->next()) {
 		tts_post_utterance_event(OS::TTS_UTTERANCE_CANCELED, E->key());
 	}
@@ -1322,6 +1330,8 @@ OS_JavaScript *OS_JavaScript::get_singleton() {
 }
 
 OS_JavaScript::OS_JavaScript() {
+	tts = GLOBAL_GET("audio/general/text_to_speech");
+
 	// Expose method for requesting quit.
 	pandemonium_js_os_request_quit_cb(&request_quit_callback);
 	// Set canvas ID

platform/javascript/os_javascript.h

@@ -93,6 +93,7 @@ private:
 	List<AudioDriverJavaScript *> audio_drivers;
 	RenderingServer *rendering_server;
 
+	bool tts;
 	bool swap_ok_cancel;
 	bool idb_available;
 	bool idb_needs_sync;

platform/osx/os_osx.mm

@@ -1593,36 +1593,43 @@ int OS_OSX::get_current_video_driver() const {
 }
 
 bool OS_OSX::tts_is_speaking() const {
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, false);
 	return [tts isSpeaking];
 }
 
 bool OS_OSX::tts_is_paused() const {
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, false);
 	return [tts isPaused];
 }
 
 Array OS_OSX::tts_get_voices() const {
+	ERR_FAIL_COND_V_MSG(!tts, Array(), "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, Array());
 	return [tts getVoices];
 }
 
 void OS_OSX::tts_speak(const String &p_text, const String &p_voice, int p_volume, float p_pitch, float p_rate, int p_utterance_id, bool p_interrupt) {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	[tts speak:p_text voice:p_voice volume:p_volume pitch:p_pitch rate:p_rate utterance_id:p_utterance_id interrupt:p_interrupt];
 }
 
 void OS_OSX::tts_pause() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	[tts pauseSpeaking];
 }
 
 void OS_OSX::tts_resume() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	[tts resumeSpeaking];
 }
 
 void OS_OSX::tts_stop() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	[tts stopSpeaking];
 }
@@ -1646,7 +1653,10 @@ Error OS_OSX::initialize(const VideoMode &p_desired, int p_video_driver, int p_a
 	CGDisplayRegisterReconfigurationCallback(displays_arrangement_changed, NULL);
 
 	// Init TTS
-	tts = [[TTS_OSX alloc] init];
+	bool tts_enabled = GLOBAL_GET("audio/general/text_to_speech");
+	if (tts_enabled) {
+		tts = [[TTS_OSX alloc] init];
+	}
 
 	window_delegate = [[PandemoniumWindowDelegate alloc] init];
 

platform/windows/os_windows.cpp

@@ -263,36 +263,43 @@ void OS_Windows::_touch_event(bool p_pressed, float p_x, float p_y, int idx) {
 };
 
 bool OS_Windows::tts_is_speaking() const {
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, false);
 	return tts->is_speaking();
 }
 
 bool OS_Windows::tts_is_paused() const {
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, false);
 	return tts->is_paused();
 }
 
 Array OS_Windows::tts_get_voices() const {
+	ERR_FAIL_COND_V_MSG(!tts, Array(), "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, Array());
 	return tts->get_voices();
 }
 
 void OS_Windows::tts_speak(const String &p_text, const String &p_voice, int p_volume, float p_pitch, float p_rate, int p_utterance_id, bool p_interrupt) {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	tts->speak(p_text, p_voice, p_volume, p_pitch, p_rate, p_utterance_id, p_interrupt);
 }
 
 void OS_Windows::tts_pause() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	tts->pause();
 }
 
 void OS_Windows::tts_resume() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	tts->resume();
 }
 
 void OS_Windows::tts_stop() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	tts->stop();
 }
@@ -1396,7 +1403,10 @@ Error OS_Windows::initialize(const VideoMode &p_desired, int p_video_driver, int
 	}
 
 	// Init TTS
-	tts = memnew(TTS_Windows);
+	bool tts_enabled = GLOBAL_GET("audio/general/text_to_speech");
+	if (tts_enabled) {
+		tts = memnew(TTS_Windows);
+	}
 
 	use_raw_input = true;
 

platform/x11/os_x11.cpp

@@ -115,36 +115,43 @@ static String get_atom_name(Display *p_disp, Atom p_atom) {
 #ifdef SPEECHD_ENABLED
 
 bool OS_X11::tts_is_speaking() const {
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, false);
 	return tts->is_speaking();
 }
 
 bool OS_X11::tts_is_paused() const {
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, false);
 	return tts->is_paused();
 }
 
 Array OS_X11::tts_get_voices() const {
+	ERR_FAIL_COND_V_MSG(!tts, Array(), "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND_V(!tts, Array());
 	return tts->get_voices();
 }
 
 void OS_X11::tts_speak(const String &p_text, const String &p_voice, int p_volume, float p_pitch, float p_rate, int p_utterance_id, bool p_interrupt) {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	tts->speak(p_text, p_voice, p_volume, p_pitch, p_rate, p_utterance_id, p_interrupt);
 }
 
 void OS_X11::tts_pause() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	tts->pause();
 }
 
 void OS_X11::tts_resume() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	tts->resume();
 }
 
 void OS_X11::tts_stop() {
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	ERR_FAIL_COND(!tts);
 	tts->stop();
 }
@@ -422,7 +429,10 @@ Error OS_X11::initialize(const VideoMode &p_desired, int p_video_driver, int p_a
 
 #ifdef SPEECHD_ENABLED
 	// Init TTS
-	tts = memnew(TTS_Linux);
+	bool tts_enabled = GLOBAL_GET("audio/general/text_to_speech");
+	if (tts_enabled) {
+		tts = memnew(TTS_Linux);
+	}
 #endif
 
 	rendering_server = memnew(RenderingServerRaster);
@@ -897,7 +907,9 @@ void OS_X11::finalize() {
 #endif
 
 #ifdef SPEECHD_ENABLED
-	memdelete(tts);
+	if (tts) {
+		memdelete(tts);
+	}
 #endif
 
 #ifdef JOYDEV_ENABLED