Add project files.

Assets/Cryville/Common/Buffers/ArrayPool.cs

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+namespace Cryville.Common.Buffers {
+	/// <summary>
+	/// A resource pool that allows reusing instances of arrays of type <typeparamref name="T" />.
+	/// </summary>
+	/// <typeparam name="T">The item type of the arrays in the pool.</typeparam>
+	public class ArrayPool<T> {
+		private class Bucket : ObjectPool<T[]> {
+			readonly int _size;
+			public Bucket(int size, int capacity) : base(capacity) {
+				_size = size;
+			}
+			protected override T[] Construct() {
+				return new T[_size];
+			}
+		}
+		Bucket[] _buckets;
+		/// <summary>
+		/// Creates an instance of the <see cref="ArrayPool{T}" /> class with the default maximum list size and bucket capacity.
+		/// </summary>
+		public ArrayPool() : this(0x40000000, 256) { }
+		/// <summary>
+		/// Creates an instance of the <see cref="ArrayPool{T}" /> class.
+		/// </summary>
+		/// <param name="maxSize">The maximum size of the arrays in the pool.</param>
+		/// <param name="capacityPerBucket">The capacity of each bucket. The pool groups arrays of similar sizes into buckets for faster access.</param>
+		public ArrayPool(int maxSize, int capacityPerBucket) {
+			if (maxSize < 16) maxSize = 16;
+			int num = GetID(maxSize) + 1;
+			_buckets = new Bucket[num];
+			for (int i = 0; i < num; i++) {
+				_buckets[i] = new Bucket(GetSize(i), capacityPerBucket);
+			}
+		}
+		/// <summary>
+		/// Rents an array that is at least the specified size from the pool.
+		/// </summary>
+		/// <param name="size">The minimum size of the array.</param>
+		/// <returns>An array of type <see cref="T" /> that is at least the specified size.</returns>
+		public T[] Rent(int size) {
+			int len2 = size;
+			if (len2 < 16) len2 = 16;
+			var arr = _buckets[GetID(len2)].Rent();
+			return arr;
+		}
+		/// <summary>
+		/// Returns a rented array to the pool.
+		/// </summary>
+		/// <param name="arr">The array to return.</param>
+		public void Return(T[] arr) {
+			int len2 = arr.Length;
+			if (len2 < 16) len2 = 16;
+			_buckets[GetID(len2)].Return(arr);
+		}
+		static int GetID(int size) {
+			size -= 1;
+			size >>= 4;
+			int num = 0;
+			for (; size != 0; size >>= 1) num++;
+			return num;
+		}
+		static int GetSize(int id) {
+			return 0x10 << id;
+		}
+	}
+}