pub type PFN_vkCmdSetDiscardRectangleEXT = unsafe extern "system" fn(_command_buffer: CommandBuffer, _first_discard_rectangle: u32, _discard_rectangle_count: u32, _discard_rectangles: *const Rect2D);
https://www.khronos.org/registry/vulkan/specs/latest/man/html/vkCmdSetDiscardRectangleEXT.html