#include "fmod_studio.hpp"
#include "fmod.hpp"
 
FMOD::Studio::System* studioSystem = nullptr;
 
// Initialize FMOD Studio
void AudioManager::Init() {
    FMOD::Studio::System::create(&studioSystem);
    studioSystem->initialize(
        512,                              // max channels
        FMOD_STUDIO_INIT_NORMAL,          // studio flags
        FMOD_INIT_NORMAL,                 // core flags
        nullptr                           // extra driver data
    );
 
    // Load master bank (always load this first)
    FMOD::Studio::Bank* masterBank = nullptr;
    studioSystem->loadBankFile("Master.bank",
        FMOD_STUDIO_LOAD_BANK_NORMAL, &masterBank);
 
    // Load strings bank (for event path lookup)
    FMOD::Studio::Bank* stringsBank = nullptr;
    studioSystem->loadBankFile("Master.strings.bank",
        FMOD_STUDIO_LOAD_BANK_NORMAL, &stringsBank);
}
 
// Play a one-shot sound event
void AudioManager::PlayOneShot(const char* eventPath) {
    FMOD::Studio::EventDescription* eventDesc = nullptr;
    studioSystem->getEvent(eventPath, &eventDesc);
 
    FMOD::Studio::EventInstance* instance = nullptr;
    eventDesc->createInstance(&instance);
 
    instance->start();
    instance->release(); // auto-release when done
}
 
// Play a persistent event (music, ambient)
FMOD::Studio::EventInstance* AudioManager::PlayPersistent(const char* eventPath) {
    FMOD::Studio::EventDescription* eventDesc = nullptr;
    studioSystem->getEvent(eventPath, &eventDesc);
 
    FMOD::Studio::EventInstance* instance = nullptr;
    eventDesc->createInstance(&instance);
    instance->start();
    return instance; // caller manages lifetime
}
 
// Set a parameter to drive adaptive audio
void AudioManager::SetParameter(FMOD::Studio::EventInstance* instance,
                                 const char* name, float value) {
    instance->setParameterByName(name, value);
}
 
// Update — call every frame
void AudioManager::Update() {
    studioSystem->update();
}
 
// Cleanup
void AudioManager::Shutdown() {
    studioSystem->unloadAll();
    studioSystem->release();
}

# Using FMOD GDNative plugin for Godot
# https://github.com/alessandrofama/fmod-for-godot
 
extends Node
 
var music_instance: FMODStudioEventInstance
 
func _ready() -> void:
    # Load banks
    FMODStudio.load_bank("res://audio/Master.bank",
        FMODStudio.LOAD_BANK_NORMAL)
    FMODStudio.load_bank("res://audio/Master.strings.bank",
        FMODStudio.LOAD_BANK_NORMAL)
 
    # Start persistent music event
    music_instance = FMODStudio.create_event_instance(
        "event:/Music/MainTheme")
    music_instance.start()
 
func play_sfx(event_path: String) -> void:
    FMODStudio.play_one_shot(event_path)
 
func set_music_intensity(value: float) -> void:
    # Drive adaptive music with gameplay parameter
    music_instance.set_parameter_by_name("Intensity", value)
 
func _process(_delta: float) -> void:
    FMODStudio.update()

using FMODUnity;
using FMOD.Studio;
 
public class AudioManager : MonoBehaviour
{
    [SerializeField] EventReference musicEvent;
    [SerializeField] EventReference footstepEvent;
 
    private EventInstance musicInstance;
 
    void Start() {
        // Start persistent music
        musicInstance = RuntimeManager.CreateInstance(musicEvent);
        musicInstance.start();
    }
 
    public void PlayFootstep(string surface) {
        // One-shot with parameter
        EventInstance sfx = RuntimeManager.CreateInstance(footstepEvent);
        sfx.setParameterByName("Surface", surface == "grass" ? 0f : 1f);
        sfx.start();
        sfx.release(); // auto-release
    }
 
    public void SetCombatIntensity(float intensity) {
        // Drive adaptive music (0 = calm, 1 = intense combat)
        musicInstance.setParameterByName("CombatIntensity", intensity);
    }
 
    void OnDestroy() {
        musicInstance.stop(FMOD.Studio.STOP_MODE.ALLOWFADEOUT);
        musicInstance.release();
    }
}

#include <AK/SoundEngine/Common/AkSoundEngine.h>
#include <AK/SoundEngine/Common/AkMemoryMgr.h>
#include <AK/MusicEngine/Common/AkMusicEngine.h>
 
// Initialize Wwise
void AudioManager::Init() {
    // Memory manager
    AkMemSettings memSettings;
    AK::MemoryMgr::GetDefaultSettings(memSettings);
    AK::MemoryMgr::Init(&memSettings);
 
    // Sound engine
    AkInitSettings initSettings;
    AkPlatformInitSettings platformSettings;
    AK::SoundEngine::GetDefaultInitSettings(initSettings);
    AK::SoundEngine::GetDefaultPlatformInitSettings(platformSettings);
    AK::SoundEngine::Init(&initSettings, &platformSettings);
 
    // Music engine
    AkMusicSettings musicSettings;
    AK::MusicEngine::GetDefaultInitSettings(musicSettings);
    AK::MusicEngine::Init(&musicSettings);
 
    // Load init bank (always required)
    AK::SoundEngine::LoadBank(AKTEXT("Init.bnk"), AK_DEFAULT_POOL_ID);
}
 
// Register a game object (every sound source needs one)
void AudioManager::RegisterObject(AkGameObjectID id, const char* name) {
    AK::SoundEngine::RegisterGameObj(id, name);
}
 
// Post an event (play a sound)
void AudioManager::PostEvent(const char* eventName, AkGameObjectID objectID) {
    AK::SoundEngine::PostEvent(eventName, objectID);
}
 
// Set RTPC value (drive adaptive audio)
void AudioManager::SetRTPC(const char* rtpcName, float value,
                            AkGameObjectID objectID = AK_INVALID_GAME_OBJECT) {
    AK::SoundEngine::SetRTPCValue(rtpcName, value, objectID);
}
 
// Set Switch (e.g., surface type for footsteps)
void AudioManager::SetSwitch(const char* switchGroup, const char* switchState,
                              AkGameObjectID objectID) {
    AK::SoundEngine::SetSwitch(switchGroup, switchState, objectID);
}
 
// Set State (global game state)
void AudioManager::SetState(const char* stateGroup, const char* state) {
    AK::SoundEngine::SetState(stateGroup, state);
}
 
// Update 3D position
void AudioManager::SetPosition(AkGameObjectID id, float x, float y, float z) {
    AkSoundPosition pos;
    pos.SetPosition(x, y, z);
    pos.SetOrientation(0, 0, 1, 0, 1, 0); // forward, up
    AK::SoundEngine::SetPosition(id, pos);
}
 
// Update — call every frame
void AudioManager::Update() {
    AK::SoundEngine::RenderAudio();
}

// In game code — update music based on gameplay state
void GameAudio::UpdateMusicState(float combatIntensity,
                                  bool bossActive,
                                  float playerHealth) {
    // Drive intensity parameter (0 = calm, 1 = full combat)
    musicInstance.setParameterByName("CombatIntensity", combatIntensity);
 
    // Switch to boss music state
    if (bossActive) {
        musicInstance.setParameterByName("BossActive", 1.0f);
    }
 
    // Low health — add tension layer
    float tension = 1.0f - (playerHealth / maxHealth);
    musicInstance.setParameterByName("PlayerTension", tension);
}

// FMOD — set 3D attributes on an event instance
FMOD_3D_ATTRIBUTES attributes = {};
attributes.position = { x, y, z };        // world position
attributes.velocity = { vx, vy, vz };     // for Doppler effect
attributes.forward  = { 0, 0, 1 };        // facing direction
attributes.up       = { 0, 1, 0 };        // up vector
 
eventInstance->set3DAttributes(&attributes);
 
// Set listener position (usually the camera/player)
FMOD_3D_ATTRIBUTES listenerAttribs = {};
listenerAttribs.position = { camX, camY, camZ };
listenerAttribs.forward  = { camFwdX, camFwdY, camFwdZ };
listenerAttribs.up       = { 0, 1, 0 };
 
studioSystem->setListenerAttributes(0, &listenerAttribs);

// Steam Audio occlusion (Godot / Unity plugin)
// Raycast from listener to source — if blocked, apply occlusion
float occlusionFactor = 0.0f;
if (Physics.Linecast(listenerPos, sourcePos, out hit)) {
    occlusionFactor = 1.0f; // fully occluded
}
// Apply low-pass filter based on occlusion
audioSource.SetOcclusionFactor(occlusionFactor);

# Apply DSP effects to FMOD buses in Godot
# FMOD Studio handles most DSP in the designer tool
# But you can also apply effects via snapshots
 
func enter_cave() -> void:
    # Activate cave reverb snapshot
    FMODStudio.set_parameter_by_name("Environment", 1.0)  # 0=outside, 1=cave
 
func go_underwater() -> void:
    # Activate underwater snapshot (low-pass + chorus)
    FMODStudio.set_parameter_by_name("Underwater", 1.0)
 
func take_damage() -> void:
    # Activate low-health snapshot (muffled, heartbeat)
    FMODStudio.set_parameter_by_name("PlayerHealth",
        float(current_health) / float(max_health))

# Godot native audio effects on buses
# Project → Project Settings → Audio → Add buses
 
extends Node
 
func _ready() -> void:
    # Get the SFX bus index
    var sfx_bus = AudioServer.get_bus_index("SFX")
 
    # Add a reverb effect to the SFX bus
    var reverb = AudioEffectReverb.new()
    reverb.room_size = 0.8
    reverb.damping = 0.5
    reverb.wet = 0.3
    AudioServer.add_bus_effect(sfx_bus, reverb)
 
    # Add a low-pass filter (for occlusion)
    var lowpass = AudioEffectLowPassFilter.new()
    lowpass.cutoff_hz = 800.0  # muffled
    AudioServer.add_bus_effect(sfx_bus, lowpass)
 
func set_underwater(active: bool) -> void:
    var sfx_bus = AudioServer.get_bus_index("SFX")
    # Enable/disable the low-pass filter effect
    AudioServer.set_bus_effect_enabled(sfx_bus, 1, active)

extends Node
 
@onready var music_player = $AudioStreamPlayer
@onready var sfx_player   = $SFXPlayer
 
func _ready() -> void:
    # Load and play music
    music_player.stream = preload("res://audio/music/main_theme.ogg")
    music_player.bus = "Music"
    music_player.volume_db = -6.0
    music_player.play()
 
func play_sfx(stream: AudioStream, pitch_variation: float = 0.1) -> void:
    sfx_player.stream = stream
    sfx_player.bus = "SFX"
    # Random pitch variation prevents repetitive sounds
    sfx_player.pitch_scale = randf_range(1.0 - pitch_variation,
                                          1.0 + pitch_variation)
    sfx_player.play()
 
func set_music_volume(db: float) -> void:
    AudioServer.set_bus_volume_db(
        AudioServer.get_bus_index("Music"), db)
 
func mute_sfx(muted: bool) -> void:
    AudioServer.set_bus_mute(
        AudioServer.get_bus_index("SFX"), muted)

using UnityEngine;
using UnityEngine.Audio;
 
public class AudioManager : MonoBehaviour
{
    [SerializeField] AudioMixer masterMixer;
    [SerializeField] AudioSource musicSource;
    [SerializeField] AudioSource sfxSource;
 
    // Play music with crossfade
    public void PlayMusic(AudioClip clip, float fadeTime = 1f) {
        StartCoroutine(CrossfadeMusic(clip, fadeTime));
    }
 
    IEnumerator CrossfadeMusic(AudioClip newClip, float duration) {
        float startVol = musicSource.volume;
        // Fade out
        for (float t = 0; t < duration; t += Time.deltaTime) {
            musicSource.volume = Mathf.Lerp(startVol, 0, t / duration);
            yield return null;
        }
        musicSource.clip = newClip;
        musicSource.Play();
        // Fade in
        for (float t = 0; t < duration; t += Time.deltaTime) {
            musicSource.volume = Mathf.Lerp(0, startVol, t / duration);
            yield return null;
        }
    }
 
    // Play SFX at position (pooled)
    public void PlaySFX(AudioClip clip, Vector3 position,
                         float volume = 1f, float pitchVariation = 0.1f) {
        AudioSource.PlayClipAtPoint(clip, position, volume);
    }
 
    // Control mixer groups via exposed parameters
    public void SetMusicVolume(float normalizedVolume) {
        // Convert 0-1 to dB (-80 to 0)
        float db = normalizedVolume > 0.001f
            ? Mathf.Log10(normalizedVolume) * 20f
            : -80f;
        masterMixer.SetFloat("MusicVolume", db);
    }
}

// Unreal Engine 5 — MetaSound and audio components
#include "Components/AudioComponent.h"
#include "Kismet/GameplayStatics.h"
#include "Sound/SoundBase.h"
 
// Play sound at location (fire and forget)
UGameplayStatics::PlaySoundAtLocation(
    this, FootstepSound, GetActorLocation(),
    FRotator::ZeroRotator,
    1.0f,   // volume multiplier
    FMath::RandRange(0.9f, 1.1f)  // pitch variation
);
 
// Spawn persistent audio component (music, ambient)
UAudioComponent* MusicComp = UGameplayStatics::SpawnSound2D(
    this, MusicAsset);
MusicComp->SetVolumeMultiplier(0.8f);
 
// Fade out music
MusicComp->FadeOut(2.0f, 0.0f); // 2 second fade to 0 volume
 
// Set audio parameter (for MetaSound)
MusicComp->SetFloatParameter(FName("CombatIntensity"), 0.8f);

// FMOD — set max voices per event
// In FMOD Studio: Event → Max Instances → set limit
// In code: check if event is already playing
FMOD::Studio::EventDescription* desc;
studioSystem->getEvent("event:/SFX/Footstep", &desc);
 
int instanceCount;
desc->getInstanceCount(&instanceCount);
 
if (instanceCount < 4) { // max 4 simultaneous footsteps
    // Create and play new instance
}

# Simple procedural engine sound in Godot
extends AudioStreamPlayer
 
@export var min_pitch: float = 0.5
@export var max_pitch: float = 2.0
 
func update_engine_sound(rpm_normalized: float) -> void:
    # rpm_normalized: 0.0 = idle, 1.0 = redline
    pitch_scale = lerp(min_pitch, max_pitch, rpm_normalized)
    volume_db   = lerp(-12.0, 0.0, rpm_normalized)