function alterColor(c: color, a: real, layer: int): color {
		const luminance = getLuminance(c);

		const offset = (!light || layer == 1 ? 1 : -layer / 2) * (light ? 0.2 : 0.3) * (1 - transparency.base) * (1 + wallLuminance * (light ? (layer == 1 ? 3 : 1) : 2.5));
		const scale = (luminance + offset) / luminance;
		const r = Math.max(0, Math.min(1, c.r * scale));
		const g = Math.max(0, Math.min(1, c.g * scale));
		const b = Math.max(0, Math.min(1, c.b * scale));

		return Qt.rgba(r, g, b, a);
	}