/**
* Create a buffer on the device
*
* @param usageFlags Usage flag bitmask for the buffer (i.e. index, vertex, uniform buffer)
* @param memoryPropertyFlags Memory properties for this buffer (i.e. device local, host visible, coherent)
* @param size Size of the buffer in byes
* @param buffer Pointer to the buffer handle acquired by the function
* @param memory Pointer to the memory handle acquired by the function
* @param data Pointer to the data that should be copied to the buffer after creation (optional, if not set, no data is copied over)
*
* @return VK_SUCCESS if buffer handle and memory have been created and (optionally passed) data has been copied
*/
public VkResult createBuffer(VkBufferUsageFlags usageFlags, VkMemoryPropertyFlags memoryPropertyFlags, ulong size, VkBuffer *buffer, VkDeviceMemory *memory, void *data = null)
{
// Create the buffer handle
VkBufferCreateInfo bufferCreateInfo = Initializers.bufferCreateInfo(usageFlags, size);
bufferCreateInfo.sharingMode = VkSharingMode.Exclusive;
Util.CheckResult(vkCreateBuffer(LogicalDevice, &bufferCreateInfo, null, buffer));
// Create the memory backing up the buffer handle
VkMemoryRequirements memReqs;
VkMemoryAllocateInfo memAlloc = Initializers.memoryAllocateInfo();
vkGetBufferMemoryRequirements(LogicalDevice, *buffer, &memReqs);
memAlloc.allocationSize = memReqs.size;
// Find a memory type index that fits the properties of the buffer
memAlloc.memoryTypeIndex = getMemoryType(memReqs.memoryTypeBits, memoryPropertyFlags);
Util.CheckResult(vkAllocateMemory(LogicalDevice, &memAlloc, null, memory));
// If a pointer to the buffer data has been passed, map the buffer and copy over the data
if (data != null)
{
void *mapped;
Util.CheckResult(vkMapMemory(LogicalDevice, *memory, 0, size, 0, &mapped));
Unsafe.CopyBlock(mapped, data, (uint)size);
// If host coherency hasn't been requested, do a manual flush to make writes visible
if ((memoryPropertyFlags & VkMemoryPropertyFlags.HostCoherent) == 0)
{
VkMappedMemoryRange mappedRange = Initializers.mappedMemoryRange();
mappedRange.memory = *memory;
mappedRange.offset = 0;
mappedRange.size = size;
vkFlushMappedMemoryRanges(LogicalDevice, 1, &mappedRange);
}
vkUnmapMemory(LogicalDevice, *memory);
}
// Attach the memory to the buffer object
Util.CheckResult(vkBindBufferMemory(LogicalDevice, *buffer, *memory, 0));
return(VkResult.Success);
}
