/**
 * @param {number} x Input bitmask representing two active frustum planes.
 * Bits 0-5: x0, x1, y0, y1, z0, z1
 * Exactly two bits are set.
 * @returns {number} A 6-bit number where bits 0-2 are the index of the first corner (0-7)
 * and bits 3-5 are the index of the second corner (0-7).
 * The corners lie on the intersection of the two active planes.
 */
export function analytical_biplanar_corner_mapping(x: number): number;
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