1 files changed, 122 insertions, 0 deletions
diff --git a/src/Ryujinx.Graphics.OpenGL/ResourcePool.cs b/src/Ryujinx.Graphics.OpenGL/ResourcePool.cs
new file mode 100644
index 00000000..57231cd6
--- /dev/null
+++ b/src/Ryujinx.Graphics.OpenGL/ResourcePool.cs
@@ -0,0 +1,122 @@
+using Ryujinx.Graphics.GAL;
+using Ryujinx.Graphics.OpenGL.Image;
+using System;
+using System.Collections.Generic;
+
+namespace Ryujinx.Graphics.OpenGL
+{
+    class DisposedTexture
+    {
+        public TextureCreateInfo Info;
+        public TextureView View;
+        public float ScaleFactor;
+        public int RemainingFrames;
+    }
+
+    /// <summary>
+    /// A structure for pooling resources that can be reused without recreation, such as textures.
+    /// </summary>
+    class ResourcePool : IDisposable
+    {
+        private const int DisposedLiveFrames = 2;
+
+        private readonly object _lock = new object();
+        private readonly Dictionary<TextureCreateInfo, List<DisposedTexture>> _textures = new Dictionary<TextureCreateInfo, List<DisposedTexture>>();
+
+        /// <summary>
+        /// Add a texture that is not being used anymore to the resource pool to be used later.
+        /// Both the texture's view and storage should be completely unused.
+        /// </summary>
+        /// <param name="view">The texture's view</param>
+        public void AddTexture(TextureView view)
+        {
+            lock (_lock)
+            {
+                List<DisposedTexture> list;
+                if (!_textures.TryGetValue(view.Info, out list))
+                {
+                    list = new List<DisposedTexture>();
+                    _textures.Add(view.Info, list);
+                }
+
+                list.Add(new DisposedTexture()
+                {
+                    Info = view.Info,
+                    View = view,
+                    ScaleFactor = view.ScaleFactor,
+                    RemainingFrames = DisposedLiveFrames
+                });
+            }
+        }
+
+        /// <summary>
+        /// Attempt to obtain a texture from the resource cache with the desired parameters.
+        /// </summary>
+        /// <param name="info">The creation info for the desired texture</param>
+        /// <param name="scaleFactor">The scale factor for the desired texture</param>
+        /// <returns>A TextureView with the description specified, or null if one was not found.</returns>
+        public TextureView GetTextureOrNull(TextureCreateInfo info, float scaleFactor)
+        {
+            lock (_lock)
+            {
+                List<DisposedTexture> list;
+                if (!_textures.TryGetValue(info, out list))
+                {
+                    return null;
+                }
+
+                foreach (DisposedTexture texture in list)
+                {
+                    if (scaleFactor == texture.ScaleFactor)
+                    {
+                        list.Remove(texture);
+                        return texture.View;
+                    }
+                }
+
+                return null;
+            }
+        }
+
+        /// <summary>
+        /// Update the pool, removing any resources that have expired.
+        /// </summary>
+        public void Tick()
+        {
+            lock (_lock)
+            {
+                foreach (List<DisposedTexture> list in _textures.Values)
+                {
+                    for (int i = 0; i < list.Count; i++)
+                    {
+                        DisposedTexture tex = list[i];
+
+                        if (--tex.RemainingFrames < 0)
+                        {
+                            tex.View.Dispose();
+                            list.RemoveAt(i--);
+                        }
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Disposes the resource pool.
+        /// </summary>
+        public void Dispose()
+        {
+            lock (_lock)
+            {
+                foreach (List<DisposedTexture> list in _textures.Values)
+                {
+                    foreach (DisposedTexture texture in list)
+                    {
+                        texture.View.Dispose();
+                    }
+                }
+                _textures.Clear();
+            }
+        }
+    }
+}