uniform float shirr[27];

vec3 shIrradiance(const vec3 nor, const float scale) {
	const float c1 = 0.429043;
	const float c2 = 0.511664;
	const float c3 = 0.743125;
	const float c4 = 0.886227;
	const float c5 = 0.247708;
	vec3 cl00, cl1m1, cl10, cl11, cl2m2, cl2m1, cl20, cl21, cl22;
	cl00 = vec3(shirr[0], shirr[1], shirr[2]);
	cl1m1 = vec3(shirr[3], shirr[4], shirr[5]);
	cl10 = vec3(shirr[6], shirr[7], shirr[8]);
	cl11 = vec3(shirr[9], shirr[10], shirr[11]);
	cl2m2 = vec3(shirr[12], shirr[13], shirr[14]);
	cl2m1 = vec3(shirr[15], shirr[16], shirr[17]);
	cl20 = vec3(shirr[18], shirr[19], shirr[20]);
	cl21 = vec3(shirr[21], shirr[22], shirr[23]);
	cl22 = vec3(shirr[24], shirr[25], shirr[26]);
	return (
		c1 * cl22 * (nor.y * nor.y - (-nor.z) * (-nor.z)) +
		c3 * cl20 * nor.x * nor.x +
		c4 * cl00 -
		c5 * cl20 +
		2.0 * c1 * cl2m2 * nor.y * (-nor.z) +
		2.0 * c1 * cl21  * nor.y * nor.x +
		2.0 * c1 * cl2m1 * (-nor.z) * nor.x +
		2.0 * c2 * cl11  * nor.y +
		2.0 * c2 * cl1m1 * (-nor.z) +
		2.0 * c2 * cl10  * nor.x
	) * scale;
}