From f556c80d0230056335632b60c71f1567e177239e Mon Sep 17 00:00:00 2001
From: Mary <me@thog.eu>
Date: Fri, 26 Feb 2021 01:11:56 +0100
Subject: Haydn: Part 1 (#2007)

* Haydn: Part 1

Based on my reverse of audio 11.0.0.

As always, core implementation under LGPLv3 for the same reasons as for Amadeus.

This place the bases of a more flexible audio system while making audout & audin accurate.

This have the following improvements:
- Complete reimplementation of audout and audin.
- Audin currently only have a dummy backend.
- Dramatically reduce CPU usage by up to 50% in common cases (SoundIO and OpenAL).
- Audio Renderer now can output to 5.1 devices when supported.
- Audio Renderer init its backend on demand instead of keeping two up all the time.
- All backends implementation are now in their own project.
- Ryujinx.Audio.Renderer was renamed Ryujinx.Audio and was refactored because of this.

As a note, games having issues with OpenAL haven't improved and will not
because of OpenAL design (stopping when buffers finish playing causing
possible audio "pops" when buffers are very small).

* Update for latest hexkyz's edits on Switchbrew

* audren: Rollback channel configuration changes

* Address gdkchan's comments

* Fix typo in OpenAL backend driver

* Address last comments

* Fix a nit

* Address gdkchan's comments
---
 Ryujinx.Audio/Renderer/Utils/SpanMemoryManager.cs | 60 +++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Ryujinx.Audio/Renderer/Utils/SpanMemoryManager.cs

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

diff --git a/Ryujinx.Audio/Renderer/Utils/SpanMemoryManager.cs b/Ryujinx.Audio/Renderer/Utils/SpanMemoryManager.cs
new file mode 100644
index 00000000..102a9f95
--- /dev/null
+++ b/Ryujinx.Audio/Renderer/Utils/SpanMemoryManager.cs
@@ -0,0 +1,60 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System;
+using System.Buffers;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Renderer.Utils
+{
+    public sealed unsafe class SpanMemoryManager<T> : MemoryManager<T>
+        where T : unmanaged
+    {
+        private readonly T* _pointer;
+        private readonly int _length;
+
+        public SpanMemoryManager(Span<T> span)
+        {
+            fixed (T* ptr = &MemoryMarshal.GetReference(span))
+            {
+                _pointer = ptr;
+                _length = span.Length;
+            }
+        }
+
+        public override Span<T> GetSpan() => new Span<T>(_pointer, _length);
+
+        public override MemoryHandle Pin(int elementIndex = 0)
+        {
+            if (elementIndex < 0 || elementIndex >= _length)
+            {
+                throw new ArgumentOutOfRangeException(nameof(elementIndex));
+            }
+
+            return new MemoryHandle(_pointer + elementIndex);
+        }
+
+        public override void Unpin() { }
+
+        protected override void Dispose(bool disposing) { }
+
+        public static Memory<T> Cast<TFrom>(Memory<TFrom> memory) where TFrom : unmanaged
+        {
+            return new SpanMemoryManager<T>(MemoryMarshal.Cast<TFrom, T>(memory.Span)).Memory;
+        }
+    }
+}
-- 
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