+uint32_t update_tri_layer_state(uint32_t state, uint8_t layer1, uint8_t layer2, uint8_t layer3) {
+ uint32_t mask12 = (1UL << layer1) | (1UL << layer2);
+ uint32_t mask3 = 1UL << layer3;
+ return (state & mask12) == mask12 ? (state | mask3) : (state & ~mask3);
+}
+