/**
 * @see A Survey of Efficient Representations for Independent Unit Vectors (Journal of Computer Graphics Techniques Vol. 3, No. 2, 2014)
 *
 * Uses hemi-octahedron for sphere approximation
 *
 * @param {number[]} output
 * @param {number} output_offset
 * @param {number} x range [-1,1]
 * @param {number} y range [-1,1]
 */
export function decode_hemioct_to_unit(output: number[], output_offset: number, x: number, y: number): void;
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