audio::play

src/audio/ALAudio.cpp

@@ -61,6 +61,14 @@ void ALSpeaker::setPitch(float pitch) {
     AL_CHECK(alSourcef(source, AL_PITCH, pitch));
 }
 
+bool ALSpeaker::isLoop() const {
+    return AL::getSourcei(source, AL_LOOPING) == AL_TRUE;
+}
+
+void ALSpeaker::setLoop(bool loop) {
+    AL_CHECK(alSourcei(source, AL_LOOPING, loop ? AL_TRUE : AL_FALSE));
+}
+
 void ALSpeaker::play() {
     AL_CHECK(alSourcePlay(source));
 }
@@ -240,5 +248,4 @@ void ALAudio::setListener(glm::vec3 position, glm::vec3 velocity, glm::vec3 at,
 }
 
 void ALAudio::update(double delta) {
-
 }

src/audio/ALAudio.h

@@ -58,6 +58,9 @@ namespace audio {
         float getPitch() const override;
         void setPitch(float pitch) override;
 
+        bool isLoop() const override;
+        void setLoop(bool loop) override;
+
         void play() override;
         void pause() override;
         void stop() override;

src/audio/audio.cpp

@@ -6,35 +6,100 @@
 #include "NoAudio.h"
 
 namespace audio {
-    extern Backend* backend;
+    static speakerid_t nextId = 1;
+    static Backend* backend;
+    static std::unordered_map<speakerid_t, std::unique_ptr<Speaker>> speakers;
 }
 
-audio::Backend* audio::backend = nullptr;
+using namespace audio;
 
 void audio::initialize(bool enabled) {
     if (enabled) {
-        audio::backend = ALAudio::create();
+        backend = ALAudio::create();
     }
-    if (audio::backend == nullptr) {
+    if (backend == nullptr) {
         std::cerr << "could not to initialize audio" << std::endl;
-        audio::backend = NoAudio::create();
+        backend = NoAudio::create();
     }
 }
 
+Sound* audio::createSound(std::shared_ptr<PCM> pcm, bool keepPCM) {
+    return backend->createSound(pcm, keepPCM);
+}
+
 void audio::setListener(
     glm::vec3 position, 
     glm::vec3 velocity, 
     glm::vec3 lookAt, 
     glm::vec3 up
 ) {
-    audio::backend->setListener(position, velocity, lookAt, up);
+    backend->setListener(position, velocity, lookAt, up);
+}
+
+void remove_lower_priority_speaker(int priority) {
+    for (auto it = speakers.begin(); it != speakers.end();) {
+        if (it->second->getPriority() < priority && it->second->isPaused()) {
+            speakers.erase(it);
+            return;
+        }
+        it++;
+    }
+    for (auto it = speakers.begin(); it != speakers.end();) {
+        if (it->second->getPriority() < priority) {
+            speakers.erase(it);
+            return;
+        }
+        it++;
+    }
+}
+
+speakerid_t audio::play(
+    Sound* sound,
+    glm::vec3 position,
+    float volume,
+    float pitch,
+    bool loop,
+    int priority
+) {
+    Speaker* speaker = sound->newInstance(priority);
+    if (speaker == nullptr) {
+        remove_lower_priority_speaker(priority);
+        speaker = sound->newInstance(priority);
+    }
+    if (speaker == nullptr) {
+        return 0;
+    }
+    speakerid_t id = nextId++;
+    speakers[id].reset(speaker);
+    speaker->setPosition(position);
+    speaker->setVolume(volume);
+    speaker->setPitch(pitch);
+    speaker->setLoop(loop);
+    speaker->play();
+    return id;
+}
+
+Speaker* audio::get(speakerid_t id) {
+    auto found = speakers.find(id);
+    if (found == speakers.end()) {
+        return nullptr;
+    }
+    return found->second.get();
 }
 
 void audio::update(double delta) {
-    audio::backend->update(delta);
+    backend->update(delta);
+
+    for (auto it = speakers.begin(); it != speakers.end();) {
+        if (it->second->isStopped()) {
+            speakers.erase(it);
+        } else {
+            it++;
+        }
+    }
 }
 
 void audio::close() {
-    delete audio::backend;
+    delete backend;
-    audio::backend = nullptr;
+    backend = nullptr;
 }

src/audio/audio.h

@@ -11,8 +11,13 @@ namespace audio {
     /// @brief duration unit is second
     using duration_t = float;
 
+    constexpr inline int PRIORITY_LOW = 0;
+    constexpr inline int PRIORITY_NORMAL = 5;
+    constexpr inline int PRIORITY_HIGH = 10;
+
     class Speaker;
 
+    /// @brief Audio speaker states
     enum class State {
         playing,
         paused,
@@ -84,6 +89,14 @@ namespace audio {
         /// @param pitch new pitch multiplier (must be positive)
         virtual void setPitch(float pitch) = 0;
 
+        /// @brief Check if speaker audio is in loop
+        /// @return true if audio is in loop
+        virtual bool isLoop() const = 0;
+
+        /// @brief Enable/disable audio loop
+        /// @param loop loop mode
+        virtual void setLoop(bool loop) = 0;
+
         /// @brief Play, replay or resume audio
         virtual void play() = 0;
 
@@ -120,6 +133,14 @@ namespace audio {
         /// @brief Get speaker priority
         /// @return speaker priority value
         virtual int getPriority() const = 0;
+
+        inline constexpr bool isPaused() const {
+            return getState() == State::paused;
+        }
+
+        inline constexpr bool isStopped() const {
+            return getState() == State::stopped;
+        }
     };
 
     class Backend {
@@ -161,6 +182,26 @@ namespace audio {
         glm::vec3 up
     );
 
+    /// @brief Play 3D sound in the world
+    /// @param sound target sound
+    /// @param position sound world position
+    /// @param volume sound volume [0.0-1.0]
+    /// @param pitch sound pitch multiplier [0.0-...]
+    /// @param loop loop sound
+    /// @param priority sound priority 
+    /// (PRIORITY_LOW, PRIORITY_NORMAL, PRIORITY_HIGH)
+    /// @return speaker id or 0
+    extern speakerid_t play(
+        Sound* sound,
+        glm::vec3 position,
+        float volume,
+        float pitch,
+        bool loop,
+        int priority
+    );
+
+    extern Speaker* get(speakerid_t id);
+    
     /// @brief Update audio streams and sound instanced
     /// @param delta time since the last update (seconds)
     extern void update(double delta);

src/engine.cpp

@@ -122,6 +122,8 @@ void Engine::mainloop() {
 		updateTimers();
 		updateHotkeys();
         
+        audio::update(delta);
+
 		gui->act(delta);
 		screen->update(delta);