Function SeedModChance

src/townname.cpp:178–190

* Generates a number from given seed. Uses different algorithm than SeedChance(). * @param shift_by number of bits seed is shifted to the right * @param max generated number is in interval 0...max-1 * @param seed seed * @return seed transformed to a number from given range */

 * @return seed transformed to a number from given range
 */
static inline uint32_t SeedModChance(uint8_t shift_by, size_t max, uint32_t seed)
{
	/* This actually gives *MUCH* more even distribution of the values
	 * than SeedChance(), which is absolutely horrible in that. If
	 * you do not believe me, try with i.e. the Czech town names,
	 * compare the words (nicely visible on prefixes) generated by
	 * SeedChance() and SeedModChance(). Do not get discouraged by the
	 * never-use-modulo myths, which hold true only for the linear
	 * congruential generators (and Random() isn't such a generator).
	 * --pasky
	 * TODO: Perhaps we should use it for all the name generators? --pasky */
	return (seed >> shift_by) % max;
}


/**