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using System;
using System.Collections.Generic;
namespace Ryujinx.Graphics.Gal.OpenGL
{
class OGLCachedResource<T>
{
public delegate void DeleteValue(T Value);
private const int MaxTimeDelta = 5 * 60000;
private const int MaxRemovalsPerRun = 10;
private struct CacheBucket
{
public T Value { get; private set; }
public LinkedListNode<long> Node { get; private set; }
public long DataSize { get; private set; }
public int Timestamp { get; private set; }
public CacheBucket(T Value, long DataSize, LinkedListNode<long> Node)
{
this.Value = Value;
this.DataSize = DataSize;
this.Node = Node;
Timestamp = Environment.TickCount;
}
}
private Dictionary<long, CacheBucket> Cache;
private LinkedList<long> SortedCache;
private DeleteValue DeleteValueCallback;
public OGLCachedResource(DeleteValue DeleteValueCallback)
{
if (DeleteValueCallback == null)
{
throw new ArgumentNullException(nameof(DeleteValueCallback));
}
this.DeleteValueCallback = DeleteValueCallback;
Cache = new Dictionary<long, CacheBucket>();
SortedCache = new LinkedList<long>();
}
public void AddOrUpdate(long Key, T Value, long Size)
{
ClearCacheIfNeeded();
LinkedListNode<long> Node = SortedCache.AddLast(Key);
CacheBucket NewBucket = new CacheBucket(Value, Size, Node);
if (Cache.TryGetValue(Key, out CacheBucket Bucket))
{
DeleteValueCallback(Bucket.Value);
SortedCache.Remove(Bucket.Node);
Cache[Key] = NewBucket;
}
else
{
Cache.Add(Key, NewBucket);
}
}
public bool TryGetValue(long Key, out T Value)
{
if (Cache.TryGetValue(Key, out CacheBucket Bucket))
{
Value = Bucket.Value;
return true;
}
Value = default(T);
return false;
}
public bool TryGetSize(long Key, out long Size)
{
if (Cache.TryGetValue(Key, out CacheBucket Bucket))
{
Size = Bucket.DataSize;
return true;
}
Size = 0;
return false;
}
private void ClearCacheIfNeeded()
{
int Timestamp = Environment.TickCount;
int Count = 0;
while (Count++ < MaxRemovalsPerRun)
{
LinkedListNode<long> Node = SortedCache.First;
if (Node == null)
{
break;
}
CacheBucket Bucket = Cache[Node.Value];
int TimeDelta = RingDelta(Bucket.Timestamp, Timestamp);
if ((uint)TimeDelta <= (uint)MaxTimeDelta)
{
break;
}
SortedCache.Remove(Node);
Cache.Remove(Node.Value);
DeleteValueCallback(Bucket.Value);
}
}
private int RingDelta(int Old, int New)
{
if ((uint)New < (uint)Old)
{
return New + (~Old + 1);
}
else
{
return New - Old;
}
}
}
}
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