Initial work

Ryujinx.Graphics.Gpu/Image/AutoDeleteCache.cs

@@ -0,0 +1,62 @@
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Ryujinx.Graphics.Gpu.Image
+{
+    class AutoDeleteCache : IEnumerable<Texture>
+    {
+        private const int MaxCapacity = 2048;
+
+        private LinkedList<Texture> _textures;
+
+        public AutoDeleteCache()
+        {
+            _textures = new LinkedList<Texture>();
+        }
+
+        public void Add(Texture texture)
+        {
+            texture.IncrementReferenceCount();
+
+            texture.CacheNode = _textures.AddLast(texture);
+
+            if (_textures.Count > MaxCapacity)
+            {
+                Texture oldestTexture = _textures.First.Value;
+
+                _textures.RemoveFirst();
+
+                oldestTexture.DecrementReferenceCount();
+
+                oldestTexture.CacheNode = null;
+            }
+        }
+
+        public void Lift(Texture texture)
+        {
+            if (texture.CacheNode != null)
+            {
+                if (texture.CacheNode != _textures.Last)
+                {
+                    _textures.Remove(texture.CacheNode);
+
+                    texture.CacheNode = _textures.AddLast(texture);
+                }
+            }
+            else
+            {
+                Add(texture);
+            }
+        }
+
+        public IEnumerator<Texture> GetEnumerator()
+        {
+            return _textures.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return _textures.GetEnumerator();
+        }
+    }
+}