Function normalize_safe

Source/astcenc_vecmathlib.h:362–371

* @brief Normalize a vector, returning @c safe if len is zero. */

 * @brief Normalize a vector, returning @c safe if len is zero.
 */
static ASTCENC_SIMD_INLINE vfloat4 normalize_safe(vfloat4 a, vfloat4 safe)
{
	vfloat4 length = dot(a, a);
	if (length.lane<0>() != 0.0f)
	{
		return a / sqrt(length);
	}

	return safe;
}