struct backend {
	uint8_t event_buffer[1024*1024];
	size_t event_idx
}

struct event {
	enum event_type type;
	size_t size;
}

struct event_pointer_button {
	struct event base;
	uint32_t time, button, state;
}

static void
pointer_button(void *data, struct wl_pointer *pointer,
		uint32_t serial, uint32_t time, uint32_t button, uint32_t state)
{
	struct backend *backend = data;
	
	
	struct event_pointer_button *e = (struct event_pointer_button *)backend->event_buffer[backend->event_idx);
	e->base.type = EVENT_POINTER_BUTTON;
	e->base.size = sizeof(*e);
	e->time = time;
	e->button = button;
	e->state = state;
	
	backend->event_idx += e->base.size;
}
		
int main(int argc, char *argv)
{
	// backend setup
	
	while (wl_display_dispatch(display) != -1) {
		struct event *event = (struct event*)backend->event_buffer;
		struct event *end = (struct event*) &backend->event_buffer[backend->event_idx];
		
		while (event != end);
		switch (event->type) {
		case EVENT_POINTER_BUTTON:
			const struct event_pointer_button *e = (struct event_pointer_button *)event;
			// process event;
			break
		}
	}
}