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87 lines
2.8 KiB
C#
87 lines
2.8 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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namespace Ryujinx.Graphics.Gpu.Image
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{
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/// <summary>
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/// A texture cache that automatically removes older textures that are not used for some time.
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/// The cache works with a rotated list with a fixed size. When new textures are added, the
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/// old ones at the bottom of the list are deleted.
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/// </summary>
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class AutoDeleteCache : IEnumerable<Texture>
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{
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private const int MaxCapacity = 2048;
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private readonly LinkedList<Texture> _textures;
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/// <summary>
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/// Creates a new instance of the automatic deletion cache.
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/// </summary>
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public AutoDeleteCache()
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{
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_textures = new LinkedList<Texture>();
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}
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/// <summary>
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/// Adds a new texture to the cache, even if the texture added is already on the cache.
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/// </summary>
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/// <remarks>
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/// Using this method is only recommended if you know that the texture is not yet on the cache,
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/// otherwise it would store the same texture more than once.
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/// </remarks>
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/// <param name="texture">The texture to be added to the cache</param>
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public void Add(Texture texture)
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{
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texture.IncrementReferenceCount();
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texture.CacheNode = _textures.AddLast(texture);
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if (_textures.Count > MaxCapacity)
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{
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Texture oldestTexture = _textures.First.Value;
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_textures.RemoveFirst();
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oldestTexture.DecrementReferenceCount();
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oldestTexture.CacheNode = null;
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}
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}
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/// <summary>
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/// Adds a new texture to the cache, or just moves it to the top of the list if the
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/// texture is already on the cache.
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/// </summary>
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/// <remarks>
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/// Moving the texture to the top of the list prevents it from being deleted,
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/// as the textures on the bottom of the list are deleted when new ones are added.
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/// </remarks>
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/// <param name="texture">The texture to be added, or moved to the top</param>
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public void Lift(Texture texture)
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{
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if (texture.CacheNode != null)
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{
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if (texture.CacheNode != _textures.Last)
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{
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_textures.Remove(texture.CacheNode);
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texture.CacheNode = _textures.AddLast(texture);
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}
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}
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else
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{
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Add(texture);
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}
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}
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public IEnumerator<Texture> GetEnumerator()
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{
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return _textures.GetEnumerator();
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}
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IEnumerator IEnumerable.GetEnumerator()
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{
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return _textures.GetEnumerator();
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}
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}
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} |