CameraModifierStack.cs

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using System.Collections.Generic;
using Microsoft.Xna.Framework;
 
namespace Terraria.Graphics.CameraModifiers;
 
public class CameraModifierStack
{
    private List<ICameraModifier> _modifiers = new List<ICameraModifier>();
 
    public void Add(ICameraModifier modifier)
    {
        RemoveIdenticalModifiers(modifier);
        _modifiers.Add(modifier);
    }
 
    private void RemoveIdenticalModifiers(ICameraModifier modifier)
    {
        string uniqueIdentity = modifier.UniqueIdentity;
        if (uniqueIdentity == null)
        {
            return;
        }
        for (int num = _modifiers.Count - 1; num >= 0; num--)
        {
            if (_modifiers[num].UniqueIdentity == uniqueIdentity)
            {
                _modifiers.RemoveAt(num);
            }
        }
    }
 
    public void ApplyTo(ref Vector2 cameraPosition)
    {
        CameraInfo cameraPosition2 = new CameraInfo(cameraPosition);
        ClearFinishedModifiers();
        for (int i = 0; i < _modifiers.Count; i++)
        {
            _modifiers[i].Update(ref cameraPosition2);
        }
        cameraPosition = cameraPosition2.CameraPosition;
    }
 
    private void ClearFinishedModifiers()
    {
        for (int num = _modifiers.Count - 1; num >= 0; num--)
        {
            if (_modifiers[num].Finished)
            {
                _modifiers.RemoveAt(num);
            }
        }
    }
}