A simple hashing function, to emulate a procedural number generator for perlin noise.

hash_coordinates.cpp

unsigned hashuint(unsigned x) {
	//found this on stack overflow
	x = ((x >> 16) ^ x) * 0x45d9f3b;
	x = ((x >> 16) ^ x) * 0x45d9f3b;
	x = ((x >> 16) ^ x);
	return x;
}

unsigned hashCoordinates(unsigned seed, int x, int y) {
	//default values when 0 is a parameter
	if (!seed) seed = 211268;
	if (!x) x = 21795;
	if (!y) y = 8081991;
	//these arguments result in interference
	seed = hashuint( (x + 1096 + y / 2) ^ (y + 20000 + x / 3) ^ seed);
	x = hashuint(x + 1096 + y / 2);
	y = hashuint(y + 20000 + x / 3);
	//return a single value by XOR
	return seed ^ x ^ y;
}