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

1 files changed, 82 insertions, 0 deletions

diff --git a/Ryujinx.Audio/Renderer/Server/Effect/EffectContext.cs b/Ryujinx.Audio/Renderer/Server/Effect/EffectContext.cs
new file mode 100644
index 00000000..ff6051ae
--- /dev/null
+++ b/Ryujinx.Audio/Renderer/Server/Effect/EffectContext.cs
@@ -0,0 +1,82 @@
+//
+// 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.Diagnostics;
+
+namespace Ryujinx.Audio.Renderer.Server.Effect
+{
+    /// <summary>
+    /// Effect context.
+    /// </summary>
+    public class EffectContext
+    {
+        /// <summary>
+        /// Storage for <see cref="BaseEffect"/>.
+        /// </summary>
+        private BaseEffect[] _effects;
+
+        /// <summary>
+        /// The total effect count.
+        /// </summary>
+        private uint _effectCount;
+
+        /// <summary>
+        /// Create a new <see cref="EffectContext"/>.
+        /// </summary>
+        public EffectContext()
+        {
+            _effects = null;
+            _effectCount = 0;
+        }
+
+        /// <summary>
+        /// Initialize the <see cref="EffectContext"/>.
+        /// </summary>
+        /// <param name="effectCount">The total effect count.</param>
+        public void Initialize(uint effectCount)
+        {
+            _effectCount = effectCount;
+            _effects = new BaseEffect[effectCount];
+
+            for (int i = 0; i < _effectCount; i++)
+            {
+                _effects[i] = new BaseEffect();
+            }
+        }
+
+        /// <summary>
+        /// Get the total effect count.
+        /// </summary>
+        /// <returns>The total effect count.</returns>
+        public uint GetCount()
+        {
+            return _effectCount;
+        }
+
+        /// <summary>
+        /// Get a reference to a <see cref="BaseEffect"/> at the given <paramref name="index"/>.
+        /// </summary>
+        /// <param name="index">The index to use.</param>
+        /// <returns>A reference to a <see cref="BaseEffect"/> at the given <paramref name="index"/>.</returns>
+        public ref BaseEffect GetEffect(int index)
+        {
+            Debug.Assert(index >= 0 && index < _effectCount);
+
+            return ref _effects[index];
+        }
+    }
+}