public unsafe Buffer(
Device device,
uint size,
VkBufferUsageFlags bufferUsageFlags,
VkMemoryPropertyFlags memoryProperty
)
{
if (size == 0)
{
throw new Exception("cannot create buffer with size of zero bytes");
}
//make sure buffer supports transfer data to and from buffer
if ((bufferUsageFlags & VkBufferUsageFlags.TransferSrc) == 0)
{
bufferUsageFlags |= VkBufferUsageFlags.TransferSrc;
}
if ((bufferUsageFlags & VkBufferUsageFlags.TransferDst) == 0)
{
bufferUsageFlags |= VkBufferUsageFlags.TransferDst;
}
//store parameter information
_size = size;
_device = device;
_bufferUsage = bufferUsageFlags;
_memoryProperty = memoryProperty;
var queueFamilyIndices = new NativeList <uint>();
foreach (var queueFamily in device.QueueFamilies)
{
queueFamilyIndices.Add(queueFamily.Index);
}
//buffer create info
var bufferCreateInfo = new VkBufferCreateInfo
{
sType = VkStructureType.BufferCreateInfo,
size = size,
usage = bufferUsageFlags,
sharingMode = VkSharingMode.Concurrent,
queueFamilyIndexCount = queueFamilyIndices.Count,
pQueueFamilyIndices = (uint *)queueFamilyIndices.Data.ToPointer()
};
//setup buffer handler
VkBuffer buffer;
if (VulkanNative.vkCreateBuffer(
device.Handle,
&bufferCreateInfo,
null,
&buffer
) != VkResult.Success)
{
throw new Exception("failed to create vulkan buffer handle");
}
_handle = buffer;
//memory allocation info
_memoryRequirements = GetMemoryRequirements(device.Handle, buffer);
var memoryAllocateInfo = new VkMemoryAllocateInfo
{
sType = VkStructureType.MemoryAllocateInfo,
allocationSize = _memoryRequirements.size,
memoryTypeIndex = device.FindMemoryType(
_memoryRequirements.memoryTypeBits,
_memoryProperty
)
};
//setup device memory
VkDeviceMemory deviceMemory;
if (VulkanNative.vkAllocateMemory(
device.Handle,
&memoryAllocateInfo,
null,
&deviceMemory
) != VkResult.Success)
{
throw new Exception("failed to allocat device memory");
}
_memoryHandle = deviceMemory;
//bind buffer handle with device memory
if (VulkanNative.vkBindBufferMemory(
device.Handle,
buffer,
deviceMemory,
0
) != VkResult.Success)
{
throw new Exception("failed to bind buffer handler to device memory");
}
}