pub type PFN_vkCmdSetViewportSwizzleNV = unsafe extern "system" fn(_command_buffer: CommandBuffer, _first_viewport: u32, _viewport_count: u32, _viewport_swizzles: *const ViewportSwizzleNV);pub type PFN_vkCmdSetViewportSwizzleNV = unsafe extern "system" fn(_command_buffer: CommandBuffer, _first_viewport: u32, _viewport_count: u32, _viewport_swizzles: *const ViewportSwizzleNV);