pub type PFN_vkAllocateCommandBuffers = unsafe extern "system" fn(device: Device, p_allocate_info: *const CommandBufferAllocateInfo, p_command_buffers: *mut CommandBuffer) -> Result;
pub type PFN_vkAllocateCommandBuffers = unsafe extern "system" fn(device: Device, p_allocate_info: *const CommandBufferAllocateInfo, p_command_buffers: *mut CommandBuffer) -> Result;