New NVDEC and VIC implementation (#1384)

* Initial NVDEC and VIC implementation

* Update FFmpeg.AutoGen to 4.3.0

* Add nvdec dependencies for Windows

* Unify some VP9 structures

* Rename VP9 structure fields

* Improvements to Video API

* XML docs for Common.Memory

* Remove now unused or redundant overloads from MemoryAccessor

* NVDEC UV surface read/write scalar paths

* Add FIXME comments about hacky things/stuff that will need to be fixed in the future

* Cleaned up VP9 memory allocation

* Remove some debug logs

* Rename some VP9 structs

* Remove unused struct

* No need to compile Ryujinx.Graphics.Host1x with unsafe anymore

* Name AsyncWorkQueue threads to make debugging easier

* Make Vp9PictureInfo a ref struct

* LayoutConverter no longer needs the depth argument (broken by rebase)

* Pooling of VP9 buffers, plus fix a memory leak on VP9

* Really wish VS could rename projects properly...

* Address feedback

* Remove using

* Catch OperationCanceledException

* Add licensing informations

* Add THIRDPARTY.md to release too

Co-authored-by: Thog <me@thog.eu>

Ryujinx.Common/Memory/Ptr.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Common.Memory
+{
+    /// <summary>
+    /// Represents a pointer to an unmanaged resource.
+    /// </summary>
+    /// <typeparam name="T">Type of the unmanaged resource</typeparam>
+    public unsafe struct Ptr<T> : IEquatable<Ptr<T>> where T : unmanaged
+    {
+        private IntPtr _ptr;
+
+        /// <summary>
+        /// Null pointer.
+        /// </summary>
+        public static Ptr<T> Null => new Ptr<T>() { _ptr = IntPtr.Zero };
+
+        /// <summary>
+        /// True if the pointer is null, false otherwise.
+        /// </summary>
+        public bool IsNull => _ptr == IntPtr.Zero;
+
+        /// <summary>
+        /// Gets a reference to the value.
+        /// </summary>
+        public ref T Value => ref Unsafe.AsRef<T>((void*)_ptr);
+
+        /// <summary>
+        /// Creates a new pointer to an unmanaged resource.
+        /// </summary>
+        /// <remarks>
+        /// For data on the heap, proper pinning is necessary during
+        /// use. Failure to do so will result in memory corruption and crashes.
+        /// </remarks>
+        /// <param name="value">Reference to the unmanaged resource</param>
+        public Ptr(ref T value)
+        {
+            _ptr = (IntPtr)Unsafe.AsPointer(ref value);
+        }
+
+        public override bool Equals(object obj)
+        {
+            return obj is Ptr<T> other && Equals(other);
+        }
+
+        public bool Equals([AllowNull] Ptr<T> other)
+        {
+            return _ptr == other._ptr;
+        }
+
+        public override int GetHashCode()
+        {
+            return _ptr.GetHashCode();
+        }
+
+        public static bool operator ==(Ptr<T> left, Ptr<T> right)
+        {
+            return left.Equals(right);
+        }
+
+        public static bool operator !=(Ptr<T> left, Ptr<T> right)
+        {
+            return !(left == right);
+        }
+    }
+}