ParticlePool.cs

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using System.Collections.Generic;
 
namespace Terraria.Graphics.Renderers;
 
public class ParticlePool<T> where T : IPooledParticle
{
    public delegate T ParticleInstantiator();
 
    private ParticleInstantiator _instantiator;
 
    private List<T> _particles;
 
    public int CountParticlesInUse()
    {
        int num = 0;
        for (int i = 0; i < num; i++)
        {
            if (!_particles[i].IsRestingInPool)
            {
                num++;
            }
        }
        return num;
    }
 
    public ParticlePool(int initialPoolSize, ParticleInstantiator instantiator)
    {
        _particles = new List<T>(initialPoolSize);
        _instantiator = instantiator;
    }
 
    public T RequestParticle()
    {
        int count = _particles.Count;
        for (int i = 0; i < count; i++)
        {
            if (_particles[i].IsRestingInPool)
            {
                _particles[i].FetchFromPool();
                return _particles[i];
            }
        }
        T val = _instantiator();
        _particles.Add(val);
        val.FetchFromPool();
        return val;
    }
}