Add love.audio.setOutputDevice

src/modules/audio/openal/Audio.cpp

@@ -98,7 +98,7 @@ static const char *getDeviceSpecifier(ALCdevice *device)
 #ifndef ALC_ALL_DEVICES_SPECIFIER
 	constexpr ALCenum ALC_ALL_DEVICES_SPECIFIER = 0x1013;
 #endif
-	static ALCenum deviceEnum = alcIsExtensionPresent(nullptr, "ALC_ENUMERATE_ALL_EXT")
+	static ALCenum deviceEnum = alcIsExtensionPresent(nullptr, "ALC_ENUMERATE_ALL_EXT") == ALC_TRUE
 		? ALC_ALL_DEVICES_SPECIFIER
 		: ALC_DEVICE_SPECIFIER;
 
@@ -112,6 +112,9 @@ Audio::Audio()
 	, poolThread(nullptr)
 	, distanceModel(DISTANCE_INVERSE_CLAMPED)
 {
+	attribs.push_back(0);
+	attribs.push_back(0);
+
 	// Before opening new device, check if recording
 	// is requested.
 	if (getRequestRecordingPermission())
@@ -134,12 +137,11 @@ Audio::Audio()
 			throw love::Exception("Could not open device.");
 
 #ifdef ALC_EXT_EFX
-		ALint attribs[4] = { ALC_MAX_AUXILIARY_SENDS, MAX_SOURCE_EFFECTS, 0, 0 };
-#else
-		ALint *attribs = nullptr;
+		attribs.insert(attribs.begin(), ALC_MAX_AUXILIARY_SENDS);
+		attribs.insert(attribs.begin() + 1, MAX_SOURCE_EFFECTS);
 #endif
 
-		context = alcCreateContext(device, attribs);
+		context = alcCreateContext(device, attribs.data());
 
 		if (context == nullptr)
 			throw love::Exception("Could not create context.");
@@ -350,6 +352,29 @@ void Audio::getOutputDevices(std::vector<std::string> &list)
 	}
 }
 
+void Audio::setOutputDevice(const char* name)
+{
+#undef ALC_SOFT_reopen_device
+#ifndef ALC_SOFT_reopen_device
+	typedef ALCboolean (ALC_APIENTRY*LPALCREOPENDEVICESOFT)(ALCdevice *device,
+		const ALCchar *deviceName, const ALCint *attribs);
+#endif
+	static LPALCREOPENDEVICESOFT alcReopenDeviceSOFT = alcIsExtensionPresent(device, "ALC_SOFT_reopen_device") == ALC_TRUE
+		? (LPALCREOPENDEVICESOFT) alcGetProcAddress(device, "alcReopenDeviceSOFT")
+		: nullptr;
+
+	if (alcReopenDeviceSOFT == nullptr)
+	{
+		// Default implementation throws exception. To make
+		// error message consistent, call the base class.
+		love::audio::Audio::setOutputDevice(name);
+		return;
+	}
+
+	if (alcReopenDeviceSOFT(device, (const ALCchar *) name, attribs.data()) == ALC_FALSE)
+		throw love::Exception("Cannot set output device: %s", alcGetString(device, alcGetError(device)));
+}
+
 void Audio::setVolume(float volume)
 {
 	alListenerf(AL_GAIN, volume);

src/modules/audio/openal/Audio.h

@@ -129,6 +129,7 @@ public:
 
 	std::string getOutputDevice();
 	void getOutputDevices(std::vector<std::string> &list);
+	void setOutputDevice(const char *name);
 
 private:
 	void initializeEFX();
@@ -140,6 +141,7 @@ private:
 
 	// The OpenAL context.
 	ALCcontext *context;
+	std::vector<ALCint> attribs;
 
 	// The OpenAL effects
 	struct EffectMapStorage