VkSubresourceHostMemcpySize

To query the memory size needed to copy to or from an image using vkCopyMemoryToImage or vkCopyImageToMemory when the VK_HOST_IMAGE_COPY_MEMCPY flag is specified, add a VkSubresourceHostMemcpySize structure to the pNext chain of the VkSubresourceLayout2 structure in a call to vkGetImageSubresourceLayout2.

The VkSubresourceHostMemcpySize structure is defined as:

typedef struct VkSubresourceHostMemcpySize {
    VkStructureType sType;
    void* pNext;
    VkDeviceSize size;
} VkSubresourceHostMemcpySize;

or the equivalent

typedef VkSubresourceHostMemcpySize VkSubresourceHostMemcpySizeEXT;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• size is the size in bytes of the image subresource.