1 files changed, 84 insertions, 0 deletions
diff --git a/Ryujinx.Graphics.Vulkan/MemoryAllocator.cs b/Ryujinx.Graphics.Vulkan/MemoryAllocator.cs
new file mode 100644
index 00000000..0b05ef92
--- /dev/null
+++ b/Ryujinx.Graphics.Vulkan/MemoryAllocator.cs
@@ -0,0 +1,84 @@
+using Silk.NET.Vulkan;
+using System;
+using System.Collections.Generic;
+
+namespace Ryujinx.Graphics.Vulkan
+{
+    class MemoryAllocator : IDisposable
+    {
+        private ulong MaxDeviceMemoryUsageEstimate = 16UL * 1024 * 1024 * 1024;
+
+        private readonly Vk _api;
+        private readonly Device _device;
+        private readonly List<MemoryAllocatorBlockList> _blockLists;
+
+        private int _blockAlignment;
+
+        public MemoryAllocator(Vk api, Device device, uint maxMemoryAllocationCount)
+        {
+            _api = api;
+            _device = device;
+            _blockLists = new List<MemoryAllocatorBlockList>();
+            _blockAlignment = (int)Math.Min(int.MaxValue, MaxDeviceMemoryUsageEstimate / (ulong)maxMemoryAllocationCount);
+        }
+
+        public MemoryAllocation AllocateDeviceMemory(
+            PhysicalDevice physicalDevice,
+            MemoryRequirements requirements,
+            MemoryPropertyFlags flags = 0)
+        {
+            int memoryTypeIndex = FindSuitableMemoryTypeIndex(_api, physicalDevice, requirements.MemoryTypeBits, flags);
+            if (memoryTypeIndex < 0)
+            {
+                return default;
+            }
+
+            bool map = flags.HasFlag(MemoryPropertyFlags.MemoryPropertyHostVisibleBit);
+            return Allocate(memoryTypeIndex, requirements.Size, requirements.Alignment, map);
+        }
+
+        private MemoryAllocation Allocate(int memoryTypeIndex, ulong size, ulong alignment, bool map)
+        {
+            for (int i = 0; i < _blockLists.Count; i++)
+            {
+                var bl = _blockLists[i];
+                if (bl.MemoryTypeIndex == memoryTypeIndex)
+                {
+                    lock (bl)
+                    {
+                        return bl.Allocate(size, alignment, map);
+                    }
+                }
+            }
+
+            var newBl = new MemoryAllocatorBlockList(_api, _device, memoryTypeIndex, _blockAlignment);
+            _blockLists.Add(newBl);
+            return newBl.Allocate(size, alignment, map);
+        }
+
+        private static int FindSuitableMemoryTypeIndex(Vk api, PhysicalDevice physicalDevice, uint memoryTypeBits, MemoryPropertyFlags flags)
+        {
+            api.GetPhysicalDeviceMemoryProperties(physicalDevice, out var properties);
+
+            for (int i = 0; i < properties.MemoryTypeCount; i++)
+            {
+                var type = properties.MemoryTypes[i];
+
+                if ((memoryTypeBits & (1 << i)) != 0 && type.PropertyFlags.HasFlag(flags))
+                {
+                    return i;
+                }
+            }
+
+            return -1;
+        }
+
+        public void Dispose()
+        {
+            for (int i = 0; i < _blockLists.Count; i++)
+            {
+                _blockLists[i].Dispose();
+            }
+        }
+    }
+}