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using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
namespace Ryujinx.Graphics.Vulkan
{
interface IRefEquatable<T>
{
bool Equals(ref T other);
}
class HashTableSlim<TKey, TValue> where TKey : IRefEquatable<TKey>
{
private const int TotalBuckets = 16; // Must be power of 2
private const int TotalBucketsMask = TotalBuckets - 1;
private struct Entry
{
public int Hash;
public TKey Key;
public TValue Value;
}
private struct Bucket
{
public int Length;
public Entry[] Entries;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public readonly Span<Entry> AsSpan()
{
return Entries == null ? Span<Entry>.Empty : Entries.AsSpan(0, Length);
}
}
private readonly Bucket[] _hashTable = new Bucket[TotalBuckets];
public IEnumerable<TKey> Keys
{
get
{
foreach (Bucket bucket in _hashTable)
{
for (int i = 0; i < bucket.Length; i++)
{
yield return bucket.Entries[i].Key;
}
}
}
}
public IEnumerable<TValue> Values
{
get
{
foreach (Bucket bucket in _hashTable)
{
for (int i = 0; i < bucket.Length; i++)
{
yield return bucket.Entries[i].Value;
}
}
}
}
public void Add(ref TKey key, TValue value)
{
var entry = new Entry
{
Hash = key.GetHashCode(),
Key = key,
Value = value,
};
int hashCode = key.GetHashCode();
int bucketIndex = hashCode & TotalBucketsMask;
ref var bucket = ref _hashTable[bucketIndex];
if (bucket.Entries != null)
{
int index = bucket.Length;
if (index >= bucket.Entries.Length)
{
Array.Resize(ref bucket.Entries, index + 1);
}
bucket.Entries[index] = entry;
}
else
{
bucket.Entries = new[]
{
entry,
};
}
bucket.Length++;
}
public bool Remove(ref TKey key)
{
int hashCode = key.GetHashCode();
ref var bucket = ref _hashTable[hashCode & TotalBucketsMask];
var entries = bucket.AsSpan();
for (int i = 0; i < entries.Length; i++)
{
ref var entry = ref entries[i];
if (entry.Hash == hashCode && entry.Key.Equals(ref key))
{
entries[(i + 1)..].CopyTo(entries[i..]);
bucket.Length--;
return true;
}
}
return false;
}
public bool TryGetValue(ref TKey key, out TValue value)
{
int hashCode = key.GetHashCode();
var entries = _hashTable[hashCode & TotalBucketsMask].AsSpan();
for (int i = 0; i < entries.Length; i++)
{
ref var entry = ref entries[i];
if (entry.Hash == hashCode && entry.Key.Equals(ref key))
{
value = entry.Value;
return true;
}
}
value = default;
return false;
}
}
}
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