audio-related minor refactor

src/audio/AL/ALAudio.cpp

@@ -207,10 +207,10 @@ ALSpeaker::~ALSpeaker() {
     }
 }
 
-void ALSpeaker::update(const Channel* channel, float masterVolume) {
+void ALSpeaker::update(const Channel* channel) {
     if (source == 0)
         return;
-    float gain = this->volume * channel->getVolume()*masterVolume;
+    float gain = this->volume * channel->getVolume();
     AL_CHECK(alSourcef(source, AL_GAIN, gain));
     
     if (!paused) {
@@ -471,6 +471,7 @@ void ALAudio::setListener(glm::vec3 position, glm::vec3 velocity, glm::vec3 at,
     AL_CHECK(alListener3f(AL_POSITION, position.x, position.y, position.z));
     AL_CHECK(alListener3f(AL_VELOCITY, velocity.x, velocity.y, velocity.z));
     AL_CHECK(alListenerfv(AL_ORIENTATION, listenerOri));
+    AL_CHECK(alListenerf(AL_GAIN, get_channel(0)->getVolume()));
 }
 
 void ALAudio::update(double delta) {

src/audio/AL/ALAudio.h

@@ -91,7 +91,7 @@ namespace audio {
         ALSpeaker(ALAudio* al, uint source, int priority, int channel);
         ~ALSpeaker();
 
-        void update(const Channel* channel, float masterVolume) override;
+        void update(const Channel* channel) override;
         int getChannel() const override;
 
         State getState() const override;

src/audio/audio.cpp

@@ -383,13 +383,12 @@ void audio::update(double delta) {
         entry.second->update(delta);
     }
 
-    float masterVolume = channels.at(0)->getVolume();
     for (auto it = speakers.begin(); it != speakers.end();) {
         auto speaker = it->second.get();
         int speakerChannel = speaker->getChannel();
         auto channel = get_channel(speakerChannel);
         if (channel != nullptr) {
-            speaker->update(channel, speakerChannel == 0 ? 1.0f : masterVolume);
+            speaker->update(channel);
         }
         if (speaker->isStopped()) {
             streams.erase(it->first);

src/audio/audio.h

@@ -235,8 +235,7 @@ namespace audio {
 
         /// @brief Synchronize the speaker with channel settings
         /// @param channel speaker channel
-        /// @param masterVolume volume of the master channel
-        virtual void update(const Channel* channel, float masterVolume) = 0;
+        virtual void update(const Channel* channel) = 0;
 
         /// @brief Check speaker channel index
         virtual int getChannel() const = 0;