File: encode_normal.frag

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// Octahedron Normal Vector 

vec2 OctWrap(vec2 v)
{
    vec2 w = 1.0 - abs( v.yx );
    if (v.x < 0.0) w.x = -w.x;
    if (v.y < 0.0) w.y = -w.y;
    return w;
}

vec2 EncodeNormal(vec3 n)
{
    n /= (abs(n.x) + abs(n.y) + abs(n.z));
    n.xy = n.z >= 0.0 ? n.xy : OctWrap(n.xy);
    n.xy = n.xy * 0.5 + 0.5;
    return n.xy;
}