Function lf_add_key_callback

leif.c:2259–2261

}

void lf_add_key_callback(void* cb) {
  state.input.key_cbs[state.input.key_cb_count++] = (KEY_CALLBACK_t)cb;
}
void lf_add_mouse_button_callback(void* cb) {
  state.input.mouse_button_cbs[state.input.mouse_button_cb_count++] = (MOUSE_BUTTON_CALLBACK_t)cb;
}