Merge pull request #34 from teamfisk/Sound

Sound

README.md

@@ -12,6 +12,7 @@ Libraries bundled along with binaries for Windows (MSVC14), available as a submo
 | **[Xerces-C++](https://xerces.apache.org/xerces-c)**             | 3.1.2        | [Apache License Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)                                                                                                          |
 | **[ImGui](https://github.com/ocornut/imgui)**                    | 2015-12-12   | [MIT License](https://github.com/ocornut/imgui/blob/de3a154f3801de22c8e0bd2aeabf663a70c05972/LICENSE)                                                                              |
 | **[nativefiledialog](https://github.com/mlabbe/nativefiledialog) | 2016-01-08   | https://github.com/mlabbe/nativefiledialog/blob/master/LICENSE                                                                                                                     |
+| **[OpenAL](https://www.openal.org/)**                            | 1.1          | [OpenAL License]()                                                                            |
 
 #### External libraries
 Libraries that are too big to be bundled with the project.

include/Engine/Sound/EContinueSound.h

@@ -0,0 +1,17 @@
+#ifndef Events_ContinueSound_h__
+#define Events_ContinueSound_h__
+
+#include "Core/EventBroker.h"
+#include "Core/Entity.h"
+
+namespace Events
+{
+// Continues to play a sound from where it was paused.
+struct ContinueSound : Event
+{
+    EntityID EmitterID;
+};
+
+}
+
+#endif

include/Engine/Sound/EPauseSound.h

@@ -0,0 +1,17 @@
+#ifndef Events_PauseSound_h__
+#define Events_PauseSound_h__
+
+#include "Core/EventBroker.h"
+#include "Core/Entity.h"
+
+namespace Events
+{
+// Pauses a playing sound
+struct PauseSound : Event
+{
+    EntityID EmitterID;
+};
+
+}
+
+#endif

include/Engine/Sound/EPlayBackgroundMusic.h

@@ -0,0 +1,18 @@
+#ifndef Events_PlayBackgroundMusic_h__
+#define Events_PlayBackgroundMusic_h__
+
+#include <string>
+#include "Core/Entity.h"
+#include "Core/Event.h"
+
+namespace Events
+{
+// Play a sound that will be heared the same anywhere
+struct PlayBackgroundMusic : public Event
+{
+    std::string FilePath = "";
+};
+
+}
+
+#endif

include/Engine/Sound/EPlaySoundOnEntity.h

@@ -0,0 +1,21 @@
+#ifndef Events_PlaySoundOnEntity_h__
+#define Events_PlaySoundOnEntity_h__
+
+#include <string>
+#include "Core/Entity.h"
+#include "Core/Event.h"
+
+namespace Events
+{
+
+// Plays a sound on an entity with a SoundEmitter component attached.
+// Sound behavior is thereby specified in the SoundEmitter component.
+struct PlaySoundOnEntity : public Event
+{
+    EntityID EmitterID = 0;
+    std::string FilePath = "";
+};
+
+}
+
+#endif

include/Engine/Sound/EPlaySoundOnPosition.h

@@ -0,0 +1,26 @@
+#ifndef Events_PlaySoundOnPosition_h__
+#define Events_PlaySoundOnPosition_h__
+
+#include <string>
+#include <glm/common.hpp>
+#include "Core/Event.h"
+
+namespace Events
+{
+
+// Plays a sound on a given position. Idk if this would be useful.
+struct PlaySoundOnPosition : public Event
+{
+    glm::vec3 Position = glm::vec3(0);
+    std::string FilePath = "";
+    float Gain = 1;
+    float Pitch = 1;
+    bool Loop = false;
+    float MaxDistance = 20;
+    float RollOffFactor = 1;
+    float ReferenceDistance = 1;
+};
+
+}
+
+#endif

include/Engine/Sound/ESetBGMGain.h

@@ -0,0 +1,16 @@
+#ifndef Events_SetBGMGain_h__
+#define Events_SetBGMGain_h__
+
+#include "Core/Event.h"
+
+namespace Events
+{
+// Set the "volume" for all background sounds
+struct SetBGMGain : public Event
+{
+    float Gain;
+};
+
+}
+
+#endif

include/Engine/Sound/ESetSFXGain.h

@@ -0,0 +1,16 @@
+#ifndef Events_SetSFXGain_h__
+#define Events_SetSFXGain_h__
+
+#include "Core/Event.h"
+
+namespace Events
+{
+// Set the "volume" for all effect sounds
+struct SetSFXGain : public Event
+{
+    float Gain;
+};
+
+}
+
+#endif

include/Engine/Sound/EStopSound.h

@@ -0,0 +1,17 @@
+#ifndef Events_StopSound_h__
+#define Events_StopSound_h__
+
+#include "Core/EventBroker.h"
+#include "Core/Entity.h"
+
+namespace Events
+{
+// Stops a sound emitter, and will also delete it.
+struct StopSound : Event
+{
+    EntityID EmitterID;
+};
+
+}
+
+#endif

include/Engine/Sound/Sound.h

@@ -0,0 +1,113 @@
+#ifndef Sound_h__
+#define Sound_h__
+
+#include "Core/ResourceManager.h"
+
+class Sound : public Resource
+{
+    friend class ResourceManager;
+public:
+    Sound(std::string path) { m_Buffer = LoadFile(path); m_Path = path; }
+    ~Sound() { ClearBuffer(); }
+    ALuint Buffer() { return m_Buffer; }
+    std::string Path() { return m_Path; }
+    float Gain() { return m_Gain; }
+    void SetGain(float value) { m_Gain = value; }
+    void ClearBuffer() { alDeleteBuffers(1, &m_Buffer); m_BufferCache.clear(); };
+
+private:
+    float m_Gain = 1;
+    ALuint m_Buffer;
+    std::string m_Path;
+
+    // File info
+    char m_Type[4];
+    unsigned long m_Size, m_ChunkSize;
+    short m_FormatType, m_Channels;
+    unsigned long m_SampleRate, m_AvgBytesPerSec;
+    short m_BytesPerSample, m_BitsPerSample;
+    unsigned int m_DataSize;
+    std::map<std::string, ALuint> m_BufferCache;
+
+    ALuint LoadFile(std::string path)
+    {
+        if (m_BufferCache.find(path) != m_BufferCache.end()) {
+            return m_BufferCache[path];
+        }
+
+        // Open file
+        FILE *fp = fopen(path.c_str(), "rb");
+        if (!fp) {
+            printf("Sound: Failed to open file %s, no such file exists", path.c_str());
+            return 0;
+        }
+
+        //CHECK FOR VALID WAVE-FILE
+        fread(m_Type, sizeof(char), 4, fp);
+        if (m_Type[0] != 'R' || m_Type[1] != 'I' || m_Type[2] != 'F' || m_Type[3] != 'F') {
+            printf("ERROR: No RIFF in WAVE-file");
+            return 0;
+        }
+
+        fread(&m_Size, 4 * sizeof(char), 1, fp);
+        fread(m_Type, sizeof(char), 4, fp);
+        if (m_Type[0] != 'W' || m_Type[1] != 'A' || m_Type[2] != 'V' || m_Type[3] != 'E') {
+            printf("ERROR: Not WAVE-file");
+            return 0;
+        }
+
+        fread(m_Type, sizeof(char), 4, fp);
+        if (m_Type[0] != 'f' || m_Type[1] != 'm' || m_Type[2] != 't' || m_Type[3] != ' ') {
+            printf("ERROR: No fmt in WAVE-file");
+            return 0;
+        }
+
+        // READ THE DATA FROM WAVE-FILE
+        fread(&m_ChunkSize, 4 * sizeof(char), 1, fp);
+        fread(&m_FormatType, 2 * sizeof(char), 1, fp);
+        fread(&m_Channels, 2 * sizeof(char), 1, fp);
+        fread(&m_SampleRate, 4 * sizeof(char), 1, fp);
+        fread(&m_AvgBytesPerSec, 4 * sizeof(char), 1, fp);
+        fread(&m_BytesPerSample, 2 * sizeof(char), 1, fp);
+        fread(&m_BitsPerSample, 2 * sizeof(char), 1, fp);
+
+        fread(m_Type, sizeof(char), 4, fp);
+        if (m_Type[0] != 'd' || m_Type[1] != 'a' || m_Type[2] != 't' || m_Type[3] != 'a') {
+            printf("ERROR: WAVE-file Missing data");
+            return 0;
+        }
+
+        fread(&m_DataSize, 4 * sizeof(char), 1, fp);
+
+        unsigned char* buf = new unsigned char[m_DataSize];
+        fread(buf, sizeof(char), m_DataSize, fp);
+        fclose(fp);
+
+        // Create buffer
+        ALuint format = 0;
+        if (m_BitsPerSample == 8) {
+            if (m_Channels == 1) {
+                format = AL_FORMAT_MONO8;
+            } else if (m_Channels == 2) {
+                format = AL_FORMAT_STEREO8;
+            }
+        }
+        if (m_BitsPerSample == 16) {
+            if (m_Channels == 1) {
+                format = AL_FORMAT_MONO16;
+            } else if (m_Channels == 2) {
+                format = AL_FORMAT_STEREO16;
+            }
+        }
+
+        ALuint buffer;
+        alGenBuffers(1, &buffer);
+        alBufferData(buffer, format, buf, m_DataSize, m_SampleRate);
+        delete[] buf;
+
+        m_BufferCache[path] = buffer;
+        return buffer;
+    }
+};
+
+#endif

include/Engine/Sound/SoundSystem.h

@@ -0,0 +1,101 @@
+#ifndef SoundSystem_h__
+#define SoundSystem_h__
+
+#include <unordered_map>
+
+#include "glm/common.hpp"
+#include "glm/gtx/rotate_vector.hpp" // Calculate Up vector
+#include "OpenAL/al.h"
+#include "OpenAL/alc.h"
+
+#include "Core/World.h"
+#include "Core/EventBroker.h"
+#include "Core/Transform.h" // Absolute transform
+#include "Sound/Sound.h"
+#include "Sound/EPlaySoundOnEntity.h"
+#include "Sound/EPlaySoundOnPosition.h"
+#include "Sound/EPlayBackgroundMusic.h"
+#include "Sound/EPauseSound.h"
+#include "Sound/EContinueSound.h"
+#include "Sound/EStopSound.h"
+#include "Sound/ESetBGMGain.h"
+#include "Sound/ESetSFXGain.h"
+
+enum class SoundType {
+    SFX,
+    BGM
+};
+
+struct Source
+{
+    Source() { }
+    Sound* SoundResource = nullptr;
+    ALuint ALsource;
+    SoundType Type;
+};
+
+class SoundSystem
+{
+public:
+    SoundSystem() { }
+    SoundSystem(World* world, EventBroker* eventBroker, bool editorMode);
+    ~SoundSystem();
+    // Update emitters / listener
+    void Update(double dt); 
+private:
+    // Help functions for working with OpenaAL
+    void setListenerPos(glm::vec3 pos) { alListener3f(AL_POSITION, pos.x, pos.y, pos.z); };
+    void setListenerVel(glm::vec3 vel) { alListener3f(AL_VELOCITY, vel.x, vel.y, vel.z); };
+    void setListenerOri(glm::vec3 ori);
+    glm::vec3 listnerPos() { glm::vec3 pos; alGetListener3f(AL_POSITION, &pos.x, &pos.y, &pos.z); return pos; };
+    glm::vec3 listenerVel() { glm::vec3 vel; alGetListener3f(AL_VELOCITY, &vel.x, &vel.y, &vel.z); return vel; };
+    glm::vec3 listenerOri() { glm::vec3 ori; alGetListener3f(AL_ORIENTATION, &ori.x, &ori.y, &ori.z); return ori; };
+    void setSourcePos(ALuint source, glm::vec3 pos) { ALfloat spos[3] = { pos.x, pos.y, pos.z };  alSourcefv(source, AL_POSITION, spos); };
+    void setSourceVel(ALuint source, glm::vec3 vel) { ALfloat svel[3] = { vel.x, vel.y, vel.z };  alSourcefv(source, AL_VELOCITY, svel); };
+
+    // Logic 
+    void initOpenAL();
+    void updateEmitters(double dt);
+    void updateListener(double dt);
+    void deleteInactiveEmitters();
+    void addNewEmitters(double dt);
+    Source* createSource(std::string filePath);
+    void playSound(Source* source);
+    void stopSound(Source* source);
+    void stopEmitters();
+    ALenum getSourceState(ALuint source);
+    void setGain(Source* source, float gain);
+    void setSoundProperties(ALuint source, ComponentWrapper* soundComponent);
+
+    // OpenAL system variables
+    ALCdevice* m_ALCdevice = nullptr;
+    ALCcontext* m_ALCcontext = nullptr;
+
+    // Logic
+    World* m_World = nullptr;
+    EventBroker* m_EventBroker = nullptr;
+    std::unordered_map<EntityID, Source*> m_Sources;
+    float m_BGMVolumeChannel = 1.0f;
+    float m_SFXVolumeChannel = 1.f;
+    bool m_EditorEnabled = false;
+
+    // Events
+    EventRelay<SoundSystem, Events::PlaySoundOnEntity> m_EPlaySoundOnEntity;
+    bool OnPlaySoundOnEntity(const Events::PlaySoundOnEntity &e);
+    EventRelay<SoundSystem, Events::PlaySoundOnPosition> m_EPlaySoundOnPosition;
+    bool OnPlaySoundOnPosition(const Events::PlaySoundOnPosition &e);
+    EventRelay<SoundSystem, Events::PlayBackgroundMusic> m_EPlayBackgroundMusic;
+    bool OnPlayBackgroundMusic(const Events::PlayBackgroundMusic &e);
+    EventRelay<SoundSystem, Events::PauseSound> m_EPauseSound;
+    bool OnPauseSound(const Events::PauseSound &e);
+    EventRelay<SoundSystem, Events::StopSound> m_EStopSound;
+    bool OnStopSound(const Events::StopSound &e);
+    EventRelay<SoundSystem, Events::ContinueSound> m_EContinueSound;
+    bool OnContinueSound(const Events::ContinueSound &e);
+    EventRelay<SoundSystem, Events::SetBGMGain> m_ESetBGMGain; 
+    bool OnSetBGMGain(const Events::SetBGMGain &e); // Not tested
+    EventRelay<SoundSystem, Events::SetSFXGain> m_ESetSFXGain; 
+    bool OnSetSFXGain(const Events::SetSFXGain &e); // Not tested
+};
+
+#endif

include/Game/Game.h

@@ -27,6 +27,8 @@
 #include "Network/Server.h"
 #include "Network/Client.h"
 
+// Sound
+#include "Sound/SoundSystem.h"
 
 class Game
 {
@@ -56,8 +58,11 @@ private:
     Network* m_ClientOrServer;
     bool m_IsClientOrServer = false;
 
-    EventRelay<Game, Events::InputCommand> m_EInputCommand;
-    bool debugOnInputCommand(const Events::InputCommand& e);
+    // Sound
+    SoundSystem* m_SoundSystem;
+
+    //EventRelay<Game, Events::InputCommand> m_EInputCommand;
+    //bool debugOnInputCommand(const Events::InputCommand& e);
 
     void debugInitialize();
     void debugTick(double dt);

resources/Schema/Components.xsd

@@ -11,4 +11,6 @@
 	<xs:include schemaLocation="Components/PointLight.xsd"/>
 	<xs:include schemaLocation="Components/Trigger.xsd"/>
 	<xs:include schemaLocation="Components/Health.xsd"/>
+	<xs:include schemaLocation="Components/Listener.xsd"/>
+	<xs:include schemaLocation="Components/SoundEmitter.xsd"/>
 </xs:schema>

resources/Schema/Components/Listener.xml

@@ -0,0 +1,3 @@
+<c:Listener>
+
+</c:Listener>

resources/Schema/Components/Listener.xsd

@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:t="types">
+	<xs:import schemaLocation="../Types.xsd" namespace="types"/>
+
+	<xs:element name="Listener">
+	</xs:element>
+</xs:schema>

resources/Schema/Components/SoundEmitter.xml

@@ -0,0 +1,9 @@
+<c:SoundEmitter>
+	<FilePath></FilePath>
+	<Gain>1.0</Gain>
+	<Pitch>1.0</Pitch>
+	<Loop>false</Loop>
+	<MaxDistance>20.0</MaxDistance>
+	<RollOffFactor>1.0</RollOffFactor>
+	<ReferenceDistance>1.0</ReferenceDistance>
+</c:SoundEmitter>

resources/Schema/Components/SoundEmitter.xsd

@@ -0,0 +1,25 @@
+<?xml version="1.0"?>
+
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:t="types">
+	<xs:import schemaLocation="../Types.xsd" namespace="types"/>
+
+	<xs:element name="SoundEmitter">
+		<xs:complexType>
+			<xs:all>
+				<xs:element name="FilePath" type="t:string" minOccurs="0"/>
+				<xs:element name="Gain" type="t:double" minOccurs="0"/>
+				<xs:annotation><xs:documentation>The "volume" of the emitter. A value betweeen 0-1</xs:documentation></xs:annotation>
+				<xs:element name="Pitch" type="t:double" minOccurs="0"/>
+				<xs:annotation><xs:documentation>The pitch of the emitter. A value betweeen 0-1</xs:documentation></xs:annotation>
+				<xs:element name="Loop" type="t:bool" minOccurs="0"/>
+				<xs:annotation><xs:documentation>If the sound should loop or not.</xs:documentation></xs:annotation>
+				<xs:element name="MaxDistance" type="t:double" minOccurs="0"/>
+				<xs:annotation><xs:documentation>The distance where there will no longer be any attenuation.</xs:documentation></xs:annotation>
+				<xs:element name="RollOffFactor" type="t:double" minOccurs="0"/>
+				<xs:annotation><xs:documentation>The rolloff rate of the source.</xs:documentation></xs:annotation>
+				<xs:element name="ReferenceDistance" type="t:double" minOccurs="0"/>
+				<xs:annotation><xs:documentation>The distance that the source will be the loudest.</xs:documentation></xs:annotation>
+			</xs:all>
+		</xs:complexType>
+	</xs:element>
+</xs:schema>

resources/Schema/Entities/SoundTestLevel.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
+<Entity xmlns:c="components" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../Types/Entity.xsd">
+
+  <Components>
+    <c:Transform/>
+  </Components>
+
+  <Children>
+    <Entity>
+      <Components>
+        <c:SoundEmitter>
+          <FilePath></FilePath>
+        </c:SoundEmitter>
+        <c:Model>
+          <Resource>Models/Core/UnitCube.obj</Resource>
+          <Color A="1" B="1" G="0.58431375" R="0.43921569"/>
+        </c:Model>
+        <c:Transform/>
+      </Components>
+      <Children/>
+    </Entity>
+    <Entity>
+      <Components>
+        <c:Camera/>
+        <c:Listener/>
+        <c:Transform>
+          <Position X="-1.81944144" Y="1.960464" Z="8.79182625"/>
+          <Orientation X="-0.261799812" Y="-0.261786997" Z="-8.48482742e-08"/>
+        </c:Transform>
+      </Components>
+      <Children/>
+    </Entity>
+  </Children>
+
+</Entity>

resources/Schema/Types/Entity.xsd

@@ -17,6 +17,8 @@
 							<xs:element ref="c:Player" minOccurs="0"/>
 							<xs:element ref="c:Health" minOccurs="0"/>
 							<xs:element ref="c:PointLight" minOccurs="0"/>
+							<xs:element ref="c:Listener" minOccurs="0"/>
+							<xs:element ref="c:SoundEmitter" minOccurs="0"/>
 						</xs:all>
 					</xs:complexType>
 				</xs:element>

src/Engine/CMakeLists.txt

@@ -9,8 +9,8 @@ find_package(ZLIB REQUIRED)
 find_package(PNG REQUIRED)
 find_package(Xerces REQUIRED)
 # Because FindOpenAL is retarded
-#set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "${CMAKE_SOURCE_DIR}/deps/include/AL")
-#find_package(OpenAL REQUIRED)
+set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "${CMAKE_SOURCE_DIR}/deps/include/OpenAL")
+find_package(OpenAL REQUIRED)
 if(UNIX)
     find_package(X11 REQUIRED)
 endif()
@@ -52,6 +52,12 @@ file(GLOB SOURCE_FILES_Network
 )
 source_group(Network FILES ${SOURCE_FILES_Network})
 
+file(GLOB SOURCE_FILES_Sound
+    "${INCLUDE_PATH}/Sound/*.h"
+    "Sound/*.cpp"
+)
+source_group(Sound FILES ${SOURCE_FILES_Sound})
+
 file(GLOB SOURCE_FILES_Rendering
     "${INCLUDE_PATH}/Rendering/*.h"
     "Rendering/*.cpp"
@@ -86,6 +92,7 @@ set(SOURCE_FILES
     ${SOURCE_FILES_Core_Util}
     ${SOURCE_FILES_Input}
 	${SOURCE_FILES_Network}
+	${SOURCE_FILES_Sound}
     ${SOURCE_FILES_GUI}
     ${SOURCE_FILES_Rendering}
     ${SOURCE_FILES_Rendering_Util}

src/Engine/Rendering/RenderSystem.cpp

@@ -39,11 +39,17 @@ void RenderSystem::switchCamera(EntityID entity)
             if (m_World->HasComponent(m_CurrentCamera, "Model")) {
                 m_World->GetComponent(m_CurrentCamera, "Model")["Visible"] = true;
             }
+            if (m_World->HasComponent(m_CurrentCamera, "Listener")) {
+                m_World->DeleteComponent(m_CurrentCamera, "Listener");
+            }
         }
 
         if (m_World->HasComponent(entity, "Model")) {
             m_World->GetComponent(entity, "Model")["Visible"] = false;
         }
+        if (!m_World->HasComponent(entity, "Listener")) {
+            m_World->AttachComponent(entity, "Listener");
+        }
         m_CurrentCamera = entity;
         m_SwitchCamera = false;
 
@@ -162,6 +168,9 @@ void RenderSystem::updateCamera(World* world, double dt)
 {
     if (m_SwitchCamera) {
         auto cameras = world->GetComponents("Camera");
+        if (cameras == nullptr) {
+            return;
+        }
         for (auto it = cameras->begin(); it != cameras->end(); it++) {
             if ((*it).EntityID == m_CurrentCamera) {
                 it++;
@@ -173,12 +182,14 @@ void RenderSystem::updateCamera(World* world, double dt)
                 break;
             }
         }
+        if (m_World->HasComponent(m_CurrentCamera, "Camera")) {
             ComponentWrapper& cameraComponent = world->GetComponent(m_CurrentCamera, "Camera");
             ComponentWrapper& cameraTransform = world->GetComponent(m_CurrentCamera, "Transform");
 
             m_DebugCameraInputController->SetOrientation(glm::quat((glm::vec3)cameraTransform["Orientation"]));
             m_DebugCameraInputController->SetPosition(cameraTransform["Position"]);
         }
+    }
 
     if (m_World->ValidEntity(m_CurrentCamera)) {
         if (world->HasComponent(m_CurrentCamera, "Camera") && world->HasComponent(m_CurrentCamera, "Transform")) {

src/Engine/Sound/SoundSystem.cpp

@@ -0,0 +1,304 @@
+#include "Sound/SoundSystem.h"
+
+SoundSystem::SoundSystem(World* world, EventBroker* eventBroker, bool editorMode)
+{
+    m_EventBroker = eventBroker;
+    m_World = world;
+    m_EditorEnabled = editorMode;
+
+    initOpenAL();
+
+    alSpeedOfSound(340.29f);
+    alDistanceModel(AL_LINEAR_DISTANCE);
+    alDopplerFactor(1);
+
+    EVENT_SUBSCRIBE_MEMBER(m_EPlaySoundOnEntity, &SoundSystem::OnPlaySoundOnEntity);
+    EVENT_SUBSCRIBE_MEMBER(m_EPlaySoundOnPosition, &SoundSystem::OnPlaySoundOnPosition);
+    EVENT_SUBSCRIBE_MEMBER(m_EPlayBackgroundMusic, &SoundSystem::OnPlayBackgroundMusic);
+    EVENT_SUBSCRIBE_MEMBER(m_EStopSound, &SoundSystem::OnStopSound);
+    EVENT_SUBSCRIBE_MEMBER(m_EPauseSound, &SoundSystem::OnPauseSound);
+    EVENT_SUBSCRIBE_MEMBER(m_EContinueSound, &SoundSystem::OnContinueSound);
+    EVENT_SUBSCRIBE_MEMBER(m_ESetBGMGain, &SoundSystem::OnSetBGMGain);
+    EVENT_SUBSCRIBE_MEMBER(m_ESetSFXGain, &SoundSystem::OnSetSFXGain);
+}
+
+SoundSystem::~SoundSystem()
+{
+    stopEmitters(); // Stopps emitters
+    deleteInactiveEmitters(); // Deletes stopped emitters
+    // Delete entities
+    std::unordered_map<EntityID, Source*>::iterator it;
+    for (it = m_Sources.begin(); it != m_Sources.end(); it++) {
+        m_World->DeleteEntity((*it).first);
+    }
+    m_Sources.clear();
+
+    alcDestroyContext(m_ALCcontext);
+    alcCloseDevice(m_ALCdevice);
+}
+
+void SoundSystem::stopEmitters()
+{
+    std::unordered_map<EntityID, Source*>::iterator it;
+    for (it = m_Sources.begin(); it != m_Sources.end(); it++) {
+        if (getSourceState(it->second->ALsource) == AL_PLAYING) {
+            stopSound(it->second);
+        }
+    }
+}
+
+void SoundSystem::Update(double dt)
+{ 
+    m_EventBroker->Process<SoundSystem>();
+    addNewEmitters(dt); // can be optimized with "EEntityCreated"
+    deleteInactiveEmitters(); // can be optimized with "EEntityDeleted"
+    updateEmitters( dt);
+    updateListener( dt);
+}
+
+void SoundSystem::deleteInactiveEmitters()
+{
+    std::unordered_map<EntityID, Source*>::iterator it;
+    for (it = m_Sources.begin(); it != m_Sources.end();) {
+        if (m_World->ValidEntity(it->first) 
+            && m_World->HasComponent(it->first, "SoundEmitter")) {
+            if (getSourceState(it->second->ALsource) != AL_STOPPED) {
+                // Nothing to see here, move along
+                it++;
+                continue;
+            } else {
+                // Sound has been stopped / finished playing. 
+                alDeleteBuffers(1, &it->second->ALsource);
+                alDeleteSources(1, &it->second->ALsource);
+                m_World->DeleteEntity(it->first);
+                delete it->second;
+                it = m_Sources.erase(it);
+            }
+        } else {
+            // Entity / Component has been removed
+            stopSound((*it).second);
+            alDeleteBuffers(1, &it->second->ALsource);
+            alDeleteSources(1, &it->second->ALsource);
+            delete it->second;
+            it = m_Sources.erase(it);
+        }
+    }
+}
+
+void SoundSystem::addNewEmitters(double dt)
+{
+    auto emitterComponents = m_World->GetComponents("SoundEmitter");
+    if (emitterComponents == nullptr) {
+        return;
+    }
+    for (auto it = emitterComponents->begin(); it != emitterComponents->end(); it++) {
+        EntityID emitter = (*it).EntityID;
+        std::unordered_map<EntityID, Source*>::iterator source;
+        source = m_Sources.find(emitter);
+        if (source == m_Sources.end()) { // Did not exist, add it
+            Source* source = createSource((std::string)(*it)["FilePath"]);
+            m_Sources[emitter] = source;
+        }
+    }
+}
+
+void SoundSystem::updateEmitters(double dt)
+{
+    std::unordered_map<EntityID, Source*>::iterator it;
+    for (it = m_Sources.begin(); it != m_Sources.end(); it++) {
+        // Get previous pos
+        glm::vec3 previousPos;
+        alGetSource3f(it->second->ALsource, AL_POSITION, &previousPos.x, &previousPos.y, &previousPos.z);
+        // Get next pos
+        glm::vec3 nextPos = Transform::AbsolutePosition(m_World, it->first);
+        // Calculate velocity
+        glm::vec3 velocity = glm::vec3(nextPos - previousPos) / (float)dt;
+        setSourcePos(it->second->ALsource, nextPos);
+        setSourceVel(it->second->ALsource, velocity);
+        float gain;
+        (bool)(it->second->Type) ? gain = m_SFXVolumeChannel : gain = m_BGMVolumeChannel;
+        auto emitter = m_World->GetComponent(it->first, "SoundEmitter");
+        setSoundProperties(it->second->ALsource, &emitter);
+
+        // To make an emitter play when spawned in editor mode
+        if (m_EditorEnabled) {
+            // Path changed
+            if (it->second->SoundResource->Path() != (std::string)emitter["FilePath"]) {
+                it->second->SoundResource = ResourceManager::Load<Sound>((std::string)emitter["FilePath"]);
+                if (it->second->SoundResource->Buffer() != 0) {
+                    playSound(it->second);
+                }
+            }
+        }
+    }
+}
+
+void SoundSystem::updateListener(double dt)
+{
+    // Should only be one listener.
+    auto listenerComponents = m_World->GetComponents("Listener");
+    if (listenerComponents == nullptr) {
+        return;
+    }
+    for (auto it = listenerComponents->begin(); it != listenerComponents->end(); it++) {
+        EntityID listener = (*it).EntityID;
+        glm::vec3 previousPos;
+        alGetListener3f(AL_POSITION, &previousPos.x, &previousPos.y, &previousPos.z); // Get previous pos
+        glm::vec3 nextPos = Transform::AbsolutePosition(m_World, listener); // Get next (current) pos
+        glm::vec3 velocity = glm::vec3(nextPos - previousPos) / (float)dt; // Calculate velocity
+        setListenerPos(nextPos);
+        setListenerVel(velocity);
+        setListenerOri(glm::eulerAngles(Transform::AbsoluteOrientation(m_World, listener)));
+    }
+}
+
+Source* SoundSystem::createSource(std::string filePath)
+{
+    ALuint alSource;
+    alGenSources((ALuint)1, &alSource);
+    alSourcef(alSource, AL_REFERENCE_DISTANCE, 1.0);
+    alSourcef(alSource, AL_MAX_DISTANCE, FLT_MAX);
+    Source* source = new Source();
+    source->ALsource = alSource;
+    source->SoundResource = ResourceManager::Load<Sound>(filePath);
+    return source;
+}
+
+void SoundSystem::playSound(Source* source)
+{
+    alSourcei(source->ALsource, AL_BUFFER, source->SoundResource->Buffer());
+    alSourcePlay(source->ALsource);
+}
+
+void SoundSystem::stopSound(Source* source)
+{
+    alSourceStop(source->ALsource);
+}
+
+bool SoundSystem::OnPlaySoundOnEntity(const Events::PlaySoundOnEntity & e)
+{
+    Source* source = createSource(e.FilePath);
+    source->Type = SoundType::SFX;
+    m_Sources[e.EmitterID] = source;
+    playSound(source);
+    return false;
+}
+
+bool SoundSystem::OnPlaySoundOnPosition(const Events::PlaySoundOnPosition & e)
+{
+    Source* source = createSource(e.FilePath);
+    auto emitterID = m_World->CreateEntity();
+    auto transform = m_World->AttachComponent(emitterID, "Transform");
+    (glm::vec3&)transform["Position"] = e.Position;
+    auto emitter = m_World->AttachComponent(emitterID, "SoundEmitter");
+    (float&)(double)emitter["Gain"] = e.Gain;
+    (float&)(double)emitter["Pitch"] = e.Pitch;
+    (bool&)emitter["Loop"] = e.Loop;
+    (float&)(double)emitter["MaxDistance"] = e.MaxDistance;
+    (float&)(double)emitter["RollOffFactor"] = e.RollOffFactor;
+    (float&)(double)emitter["ReferenceDistance"] = e.ReferenceDistance;
+    auto model = m_World->AttachComponent(emitterID, "Model");
+    (std::string&)model["Resource"] = "Models/Core/UnitCube.obj";
+    source->Type = SoundType::SFX;
+    m_Sources[emitterID] = source;
+    playSound(source);
+    return true;
+}
+
+bool SoundSystem::OnPauseSound(const Events::PauseSound & e)
+{
+    alSourcePause(m_Sources[e.EmitterID]->ALsource);
+    return true;
+}
+
+bool SoundSystem::OnStopSound(const Events::StopSound & e)
+{
+    alSourceStop(m_Sources[e.EmitterID]->ALsource);
+    return true;
+}
+
+bool SoundSystem::OnContinueSound(const Events::ContinueSound & e)
+{
+    alSourcePlay(m_Sources[e.EmitterID]->ALsource);
+    return true;
+}
+
+bool SoundSystem::OnPlayBackgroundMusic(const Events::PlayBackgroundMusic & e)
+{
+    auto listenerComponents = m_World->GetComponents("Listener");
+    for (auto it = listenerComponents->begin(); it != listenerComponents->end(); it++) {
+        auto emitterChild = m_World->CreateEntity((*it).EntityID);
+        auto emitter = m_World->AttachComponent(emitterChild, "SoundEmitter");
+        (bool&)emitter["Loop"] = true;
+        (std::string&)emitter["FilePath"] = e.FilePath;
+        m_World->AttachComponent(emitterChild, "Transform");
+        Source* source = createSource(e.FilePath);
+        source->Type = SoundType::BGM;
+        m_Sources[emitterChild] = source;
+        playSound(source);
+    }
+    return true;
+}
+
+bool SoundSystem::OnSetBGMGain(const Events::SetBGMGain & e)
+{
+    m_BGMVolumeChannel = e.Gain;
+    return true;
+}
+
+bool SoundSystem::OnSetSFXGain(const Events::SetSFXGain & e)
+{
+    m_SFXVolumeChannel = e.Gain;
+    return true;
+}
+
+void SoundSystem::setListenerOri(glm::vec3 ori)
+{
+    // Calculate forward and up vector.
+    glm::vec3 forward = glm::vec3(0.0, 0.0, -1.0);
+    forward = glm::rotateX(forward, ori.x);
+    forward = glm::rotateY(forward, ori.y);
+    forward = glm::rotateZ(forward, ori.z);
+    glm::normalize(forward);
+    glm::vec3 up = glm::vec3(0.0, 1.0, 0.0);
+    up = glm::rotateX(up, ori.x);
+    up = glm::rotateY(up, ori.y);
+    up = glm::rotateZ(up, ori.z);
+    glm::normalize(up);
+    ALfloat lOri[6] = { forward.x, forward.y, forward.z, up.x, up.y, up.z };
+    alListenerfv(AL_ORIENTATION, lOri);
+}
+
+ALenum SoundSystem::getSourceState(ALuint source)
+{
+    ALenum state;
+    alGetSourcei(source, AL_SOURCE_STATE, &state);
+    return state;
+}
+
+void SoundSystem::setGain(Source * source, float gain)
+{
+    alSourcef(source->ALsource, AL_GAIN, gain);
+}
+
+void SoundSystem::setSoundProperties(ALuint source, ComponentWrapper* soundComponent)
+{
+    alSourcef(source, AL_GAIN, (float)(double)(*soundComponent)["Gain"]);
+    alSourcef(source, AL_PITCH, (float)(double)(*soundComponent)["Pitch"]);
+    alSourcei(source, AL_LOOPING, (int)(bool)(*soundComponent)["Loop"]); // YOLO
+    alSourcef(source, AL_MAX_DISTANCE, (float)(double)(*soundComponent)["MaxDistance"]);
+    alSourcef(source, AL_ROLLOFF_FACTOR, (float)(double)(*soundComponent)["RollOffFactor"]);
+    alSourcef(source, AL_REFERENCE_DISTANCE, (float)(double)(*soundComponent)["ReferenceDistance"]);
+}
+
+void SoundSystem::initOpenAL()
+{
+    // Initialize OpenAL
+    m_ALCdevice = alcOpenDevice(nullptr);
+    if (m_ALCdevice != nullptr) {
+        m_ALCcontext = alcCreateContext(m_ALCdevice, nullptr);
+        alcMakeContextCurrent(m_ALCcontext);
+    } else {
+        LOG_ERROR("OpenAL failed to initialize.");
+    }
+}

src/Game/Game.cpp

@@ -7,6 +7,7 @@
 Game::Game(int argc, char* argv[])
 {
     ResourceManager::RegisterType<ConfigFile>("ConfigFile");
+    ResourceManager::RegisterType<Sound>("Sound");
     ResourceManager::RegisterType<Model>("Model");
     ResourceManager::RegisterType<RawModel>("RawModel");
     ResourceManager::RegisterType<Texture>("Texture");
@@ -83,12 +84,17 @@ Game::Game(int argc, char* argv[])
         //boost::thread workerThread(&Game::networkFunction, this);
         networkFunction();
     }
+
+    // Invoke sound system
+    m_SoundSystem = new SoundSystem(m_World, m_EventBroker, m_Config->Get<bool>("Debug.EditorEnabled", false));
+
     m_LastTime = glfwGetTime();
 }
 
 Game::~Game()
 {
     delete m_SystemPipeline;
+    delete m_SoundSystem;
     delete m_World;
     delete m_FrameStack;
     delete m_InputProxy;
@@ -122,9 +128,10 @@ void Game::Tick()
     }
     // Iterate through systems and update world!
     m_SystemPipeline->Update(m_World, dt);
+    debugTick(dt);
     m_Renderer->Update(dt);
     m_EventBroker->Process<Client>();
-
+    m_SoundSystem->Update(dt);
     GLERROR("Game::Tick m_RenderQueueFactory->Update");
     m_Renderer->Draw(*m_RenderFrame);
     GLERROR("Game::Tick m_Renderer->Draw");