ActiveSound.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
 
namespace Terraria.Audio;
 
public class ActiveSound
{
    public delegate bool LoopedPlayCondition();
 
    public readonly bool IsGlobal;
 
    public Vector2 Position;
 
    public float Volume;
 
    public float Pitch;
 
    public LoopedPlayCondition Condition;
 
    public SoundEffectInstance Sound { get; private set; }
 
    public SoundStyle Style { get; private set; }
 
    public bool IsPlaying => Sound.State == SoundState.Playing;
 
    public ActiveSound(SoundStyle style, Vector2 position)
    {
        Position = position;
        Volume = 1f;
        Pitch = style.PitchVariance;
        IsGlobal = false;
        Style = style;
        Play();
    }
 
    public ActiveSound(SoundStyle style)
    {
        Position = Vector2.Zero;
        Volume = 1f;
        Pitch = style.PitchVariance;
        IsGlobal = true;
        Style = style;
        Play();
    }
 
    public ActiveSound(SoundStyle style, Vector2 position, LoopedPlayCondition condition)
    {
        Position = position;
        Volume = 1f;
        Pitch = style.PitchVariance;
        IsGlobal = false;
        Style = style;
        PlayLooped(condition);
    }
 
    private void Play()
    {
        SoundEffectInstance soundEffectInstance = Style.GetRandomSound().CreateInstance();
        soundEffectInstance.Pitch += Style.GetRandomPitch();
        Pitch = soundEffectInstance.Pitch;
        soundEffectInstance.Play();
        SoundInstanceGarbageCollector.Track(soundEffectInstance);
        Sound = soundEffectInstance;
        Update();
    }
 
    private void PlayLooped(LoopedPlayCondition condition)
    {
        SoundEffectInstance soundEffectInstance = Style.GetRandomSound().CreateInstance();
        soundEffectInstance.Pitch += Style.GetRandomPitch();
        Pitch = soundEffectInstance.Pitch;
        soundEffectInstance.IsLooped = true;
        Condition = condition;
        soundEffectInstance.Play();
        SoundInstanceGarbageCollector.Track(soundEffectInstance);
        Sound = soundEffectInstance;
        Update();
    }
 
    public void Stop()
    {
        if (Sound != null)
        {
            Sound.Stop();
        }
    }
 
    public void Pause()
    {
        if (Sound != null && Sound.State == SoundState.Playing)
        {
            Sound.Pause();
        }
    }
 
    public void Resume()
    {
        if (Sound != null && Sound.State == SoundState.Paused)
        {
            Sound.Resume();
        }
    }
 
    public void Update()
    {
        if (Sound == null)
        {
            return;
        }
        if (Condition != null && !Condition())
        {
            Sound.Stop(immediate: true);
            return;
        }
        Vector2 value = Main.screenPosition + new Vector2(Main.screenWidth / 2, Main.screenHeight / 2);
        float num = 1f;
        if (!IsGlobal)
        {
            float value2 = (Position.X - value.X) / ((float)Main.screenWidth * 0.5f);
            value2 = MathHelper.Clamp(value2, -1f, 1f);
            Sound.Pan = value2;
            float num2 = Vector2.Distance(Position, value);
            num = 1f - num2 / ((float)Main.screenWidth * 1.5f);
        }
        num *= Style.Volume * Volume;
        switch (Style.Type)
        {
        case SoundType.Sound:
            num *= Main.soundVolume;
            break;
        case SoundType.Ambient:
            num *= Main.ambientVolume;
            break;
        case SoundType.Music:
            num *= Main.musicVolume;
            break;
        }
        num = MathHelper.Clamp(num, 0f, 1f);
        Sound.Volume = num;
        Sound.Pitch = Pitch;
    }
}