Move solution and projects to src

src/Ryujinx.Graphics.Vulkan/SemaphoreHolder.cs

@@ -0,0 +1,60 @@
+using Silk.NET.Vulkan;
+using System;
+using System.Threading;
+using VkSemaphore = Silk.NET.Vulkan.Semaphore;
+
+namespace Ryujinx.Graphics.Vulkan
+{
+    class SemaphoreHolder : IDisposable
+    {
+        private readonly Vk _api;
+        private readonly Device _device;
+        private VkSemaphore _semaphore;
+        private int _referenceCount;
+        public bool _disposed;
+
+        public unsafe SemaphoreHolder(Vk api, Device device)
+        {
+            _api = api;
+            _device = device;
+
+            var semaphoreCreateInfo = new SemaphoreCreateInfo()
+            {
+                SType = StructureType.SemaphoreCreateInfo
+            };
+
+            api.CreateSemaphore(device, in semaphoreCreateInfo, null, out _semaphore).ThrowOnError();
+
+            _referenceCount = 1;
+        }
+
+        public VkSemaphore GetUnsafe()
+        {
+            return _semaphore;
+        }
+
+        public VkSemaphore Get()
+        {
+            Interlocked.Increment(ref _referenceCount);
+            return _semaphore;
+        }
+
+        public unsafe void Put()
+        {
+            if (Interlocked.Decrement(ref _referenceCount) == 0)
+            {
+                _api.DestroySemaphore(_device, _semaphore, null);
+                _semaphore = default;
+            }
+        }
+
+        public void Dispose()
+        {
+            if (!_disposed)
+            {
+                Put();
+                _disposed = true;
+            }
+        }
+    }
+}