From cee712105850ac3385cd0091a923438167433f9f Mon Sep 17 00:00:00 2001
From: TSR Berry <20988865+TSRBerry@users.noreply.github.com>
Date: Sat, 8 Apr 2023 01:22:00 +0200
Subject: Move solution and projects to src

---
 src/Ryujinx.Audio/Renderer/Utils/BitArray.cs | 103 +++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 src/Ryujinx.Audio/Renderer/Utils/BitArray.cs

(limited to 'src/Ryujinx.Audio/Renderer/Utils/BitArray.cs')

diff --git a/src/Ryujinx.Audio/Renderer/Utils/BitArray.cs b/src/Ryujinx.Audio/Renderer/Utils/BitArray.cs
new file mode 100644
index 00000000..8b105477
--- /dev/null
+++ b/src/Ryujinx.Audio/Renderer/Utils/BitArray.cs
@@ -0,0 +1,103 @@
+using System;
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Audio.Renderer.Utils
+{
+    /// <summary>
+    /// A simple bit array implementation backed by a <see cref="Memory{T}"/>.
+    /// </summary>
+    public class BitArray
+    {
+        /// <summary>
+        /// The backing storage of the <see cref="BitArray"/>.
+        /// </summary>
+        private Memory<byte> _storage;
+
+        /// <summary>
+        /// Create a new <see cref="BitArray"/> from <see cref="Memory{T}"/>.
+        /// </summary>
+        /// <param name="storage">The backing storage of the <see cref="BitArray"/>.</param>
+        public BitArray(Memory<byte> storage)
+        {
+            _storage = storage;
+        }
+
+        /// <summary>
+        /// Get the byte position of a given bit index.
+        /// </summary>
+        /// <param name="index">A bit index.</param>
+        /// <returns>The byte position of a given bit index.</returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static int ToPosition(int index) => index / 8;
+
+        /// <summary>
+        /// Get the bit position of a given bit index inside a byte.
+        /// </summary>
+        /// <param name="index">A bit index.</param>
+        /// <returns>The bit position of a given bit index inside a byte.</returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static int ToBitPosition(int index) => index % 8;
+
+        /// <summary>
+        /// Test if the bit at the given index is set.
+        /// </summary>
+        /// <param name="index">A bit index.</param>
+        /// <returns>Return true if the bit at the given index is set</returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public bool Test(int index)
+        {
+            ulong mask = 1ul << ToBitPosition(index);
+
+            return (_storage.Span[ToPosition(index)] & mask) == mask;
+        }
+
+        /// <summary>
+        /// Set the bit at the given index.
+        /// </summary>
+        /// <param name="index">A bit index.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void Set(int index)
+        {
+            Set(index, true);
+        }
+
+        /// <summary>
+        /// Reset the bit at the given index.
+        /// </summary>
+        /// <param name="index">A bit index.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void Reset(int index)
+        {
+            Set(index, false);
+        }
+
+        /// <summary>
+        /// Set a bit value at the given index.
+        /// </summary>
+        /// <param name="index">A bit index.</param>
+        /// <param name="value">The new bit value.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void Set(int index, bool value)
+        {
+            byte mask = (byte)(1 << ToBitPosition(index));
+
+            if (value)
+            {
+                _storage.Span[ToPosition(index)] |= mask;
+            }
+            else
+            {
+                _storage.Span[ToPosition(index)] &= (byte)~mask;
+            }
+        }
+
+        /// <summary>
+        /// Reset all bits in the storage.
+        /// </summary>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void Reset()
+        {
+            _storage.Span.Fill(0);
+        }
+    }
+}
\ No newline at end of file
-- 
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