pub type PFN_vkCmdCopyBuffer = unsafe extern "system" fn(command_buffer: CommandBuffer, src_buffer: Buffer, dst_buffer: Buffer, region_count: u32, p_regions: *const BufferCopy);
pub type PFN_vkCmdCopyBuffer = unsafe extern "system" fn(command_buffer: CommandBuffer, src_buffer: Buffer, dst_buffer: Buffer, region_count: u32, p_regions: *const BufferCopy);