test.zig

  fn drain(self: *EventQueue) void {
        if (self.processor == null) {
            self.queue_C = 0;
            return;
        }
        var processor = self.processor orelse return;

        // copy from queue
        self.processing_queue = self.queue;
        self.processing_queue_C = self.queue_C;
        self.queue_C = 0;

        var i: usize = 0;
        while (i < self.processing_queue_C) : (i += 1) {
            var e: InputEvent = self.processing_queue[i];

            self.current_event_time = e.time;

            switch (e.event_type) {
                KEY_DOWN => {
                    _ = processor.key_down(e.event.key_down.key) orelse false;
                },
                KEY_UP => {
                    _ = processor.key_up.?(e.event.key_up.key) orelse false;
                },
                KEY_TYPED => {
                    _ = processor.key_typed.?(e.event.key_typed.character) orelse false;
                },
                else => {},
            }
        }
    }