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using System;
using System.IO;
using System.Runtime.InteropServices;
using Vulkan;
using static Vulkan.VulkanNative;
namespace VKE {
public abstract class Resource : Activable {
protected VkDeviceMemory vkMemory;
protected UInt64 deviceMemSize;
protected IntPtr mappedData;
public readonly VkMemoryPropertyFlags MemoryFlags;
public IntPtr MappedData => mappedData;
public UInt64 AllocatedDeviceMemorySize => deviceMemSize;
protected Resource (Device device, VkMemoryPropertyFlags memoryFlags) : base (device) {
MemoryFlags = memoryFlags;
}
protected abstract VkMemoryRequirements getMemoryRequirements ();
protected abstract void bindMemory (ulong offset);
protected void allocateMemory () {
VkMemoryRequirements memReqs = getMemoryRequirements ();
VkMemoryAllocateInfo memInfo = VkMemoryAllocateInfo.New ();
memInfo.allocationSize = memReqs.size;
memInfo.memoryTypeIndex = dev.GetMemoryTypeIndex (memReqs.memoryTypeBits, MemoryFlags);
Utils.CheckResult (vkAllocateMemory (dev.VkDev, ref memInfo, IntPtr.Zero, out vkMemory));
deviceMemSize = memInfo.allocationSize;
}
public void Map (ulong size = WholeSize, ulong offset = 0) {
Utils.CheckResult (vkMapMemory (dev.VkDev, vkMemory, offset, size, 0, ref mappedData));
}
public void Unmap () {
vkUnmapMemory (dev.VkDev, vkMemory);
mappedData = IntPtr.Zero;
}
public void Update (object data, ulong size) {
GCHandle ptr = GCHandle.Alloc (data, GCHandleType.Pinned);
unsafe {
System.Buffer.MemoryCopy (ptr.AddrOfPinnedObject ().ToPointer (), mappedData.ToPointer (), size, size);
Flush ();
}
ptr.Free ();
}
public void Flush (ulong size = WholeSize, ulong offset = 0) {
VkMappedMemoryRange range = new VkMappedMemoryRange {
sType = VkStructureType.MappedMemoryRange,
memory = vkMemory,
offset = offset,
size = size,
};
vkFlushMappedMemoryRanges (dev.VkDev, 1, ref range);
}
#region IDisposable Support
protected override void Dispose (bool disposing) {
if (!disposing)
System.Diagnostics.Debug.WriteLine ("VKE Activable object disposed by finalizer");
if (state == ActivableState.Activated) {
if (mappedData != IntPtr.Zero)
Unmap ();
vkFreeMemory (dev.VkDev, vkMemory, IntPtr.Zero);
}
base.Dispose (disposing);
}
#endregion
}
}
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