using System.Collections.Generic;
using UnityEngine;

namespace UltimateWater.Internal
{
	public class RenderTexturesCache
	{
		[ExecuteInEditMode]
		public class RenderTexturesUpdater : MonoBehaviour
		{
			private static RenderTexturesUpdater _Instance;

			public static void EnsureInstance()
			{
				if (!(_Instance != null))
				{
					GameObject gameObject = new GameObject("Water.RenderTexturesCache");
					gameObject.hideFlags = HideFlags.HideAndDontSave;
					GameObject gameObject2 = gameObject;
					if (Application.isPlaying)
					{
						Object.DontDestroyOnLoad(gameObject2);
					}
					_Instance = gameObject2.AddComponent<RenderTexturesUpdater>();
				}
			}

			private void Update()
			{
				int frameCount = Time.frameCount;
				Dictionary<ulong, RenderTexturesCache>.Enumerator enumerator = _Cache.GetEnumerator();
				while (enumerator.MoveNext())
				{
					enumerator.Current.Value.Update(frameCount);
				}
				enumerator.Dispose();
			}

			private void OnApplicationQuit()
			{
				Dictionary<ulong, RenderTexturesCache>.Enumerator enumerator = _Cache.GetEnumerator();
				while (enumerator.MoveNext())
				{
					enumerator.Current.Value.Release();
				}
				enumerator.Dispose();
			}
		}

		private static readonly Dictionary<ulong, RenderTexturesCache> _Cache = new Dictionary<ulong, RenderTexturesCache>(UInt64EqualityComparer.Default);

		private readonly Queue<RenderTexture> _RenderTextures;

		private int _LastFrameAllUsed;

		private readonly ulong _Hash;

		private readonly int _Width;

		private readonly int _Height;

		private readonly int _DepthBuffer;

		private readonly RenderTextureFormat _Format;

		private readonly bool _Linear;

		private readonly bool _Uav;

		private readonly bool _MipMaps;

		public RenderTexturesCache(ulong hash, int width, int height, int depthBuffer, RenderTextureFormat format, bool linear, bool uav, bool mipMaps)
		{
			_Hash = hash;
			_Width = width;
			_Height = height;
			_DepthBuffer = depthBuffer;
			_Format = format;
			_Linear = linear;
			_Uav = uav;
			_MipMaps = mipMaps;
			_RenderTextures = new Queue<RenderTexture>();
		}

		public static RenderTexturesCache GetCache(int width, int height, int depthBuffer, RenderTextureFormat format, bool linear, bool uav, bool mipMaps = false)
		{
			RenderTexturesUpdater.EnsureInstance();
			ulong num = 0uL;
			num |= (uint)width;
			num |= (uint)(height << 16);
			num |= (ulong)((long)depthBuffer << 29);
			num |= (ulong)((long)((!linear) ? 0 : 1) << 34);
			num |= (ulong)((long)((!uav) ? 0 : 1) << 35);
			num |= (ulong)((long)((!mipMaps) ? 0 : 1) << 36);
			num |= (ulong)((long)format << 37);
			RenderTexturesCache value;
			if (!_Cache.TryGetValue(num, out value))
			{
				value = (_Cache[num] = new RenderTexturesCache(num, width, height, depthBuffer, format, linear, uav, mipMaps));
			}
			return value;
		}

		public static TemporaryRenderTexture GetTemporary(int width, int height, int depthBuffer, RenderTextureFormat format, bool linear, bool uav, bool mipMaps = false)
		{
			return GetCache(width, height, depthBuffer, format, linear, uav, mipMaps).GetTemporary();
		}

		public TemporaryRenderTexture GetTemporary()
		{
			return new TemporaryRenderTexture(this);
		}

		public RenderTexture GetTemporaryDirect()
		{
			RenderTexture renderTexture;
			if (_RenderTextures.Count == 0)
			{
				renderTexture = new RenderTexture(_Width, _Height, _DepthBuffer, _Format, _Linear ? RenderTextureReadWrite.Linear : RenderTextureReadWrite.sRGB);
				renderTexture.hideFlags = HideFlags.DontSave;
				renderTexture.name = "[UWS] RenderTexturesCache - Temporary#" + _Hash;
				renderTexture.filterMode = FilterMode.Point;
				renderTexture.anisoLevel = 1;
				renderTexture.wrapMode = TextureWrapMode.Repeat;
				renderTexture.useMipMap = _MipMaps;
				renderTexture.autoGenerateMips = _MipMaps;
				if (_Uav)
				{
					renderTexture.enableRandomWrite = true;
				}
			}
			else
			{
				renderTexture = _RenderTextures.Dequeue();
			}
			if (_Uav && !renderTexture.IsCreated())
			{
				renderTexture.Create();
			}
			if (_RenderTextures.Count == 0)
			{
				_LastFrameAllUsed = Time.frameCount;
			}
			return renderTexture;
		}

		public void ReleaseTemporaryDirect(RenderTexture renderTexture)
		{
			_RenderTextures.Enqueue(renderTexture);
		}

		internal void Update(int frame)
		{
			if (frame - _LastFrameAllUsed > 3 && _RenderTextures.Count != 0)
			{
				RenderTexture obj = _RenderTextures.Dequeue();
				obj.Destroy();
			}
		}

		internal void Release()
		{
			foreach (RenderTexture renderTexture in _RenderTextures)
			{
				if (renderTexture != null)
				{
					renderTexture.Release();
					renderTexture.Destroy();
				}
			}
			_RenderTextures.Clear();
		}
	}
}