CynNoise.cs

// source: Math for Game Programmers: Noise-Based RNG
// https://www.youtube.com/watch?v=LWFzPP8ZbdU
public static class CynNoise {
	const uint BIT_NOISE0 = 0xB5297A4D;
	const uint BIT_NOISE1 = 0x68E31DA4;
	const uint BIT_NOISE2 = 0x1B56C4E9;
	
	const uint PRIME0 = 3175861097;
	const uint PRIME1 = 198491317;
	const uint PRIME2 = 6542989;

	public static uint Noise(uint position, uint seed = 0) {
		uint mangled = position;
		mangled *= BIT_NOISE0;
		mangled += seed;
		mangled ^= mangled >> 8;
		mangled += BIT_NOISE1;
		mangled ^= mangled << 8;
		mangled *= BIT_NOISE2;
		mangled ^= mangled >> 8;
		return mangled;
	}
	public static uint Noise2D(uint positionX, uint positionY, uint seed = 0) {
		return Noise(positionX + PRIME0 * positionY, seed);
	}
	public static uint Noise3D(uint positionX, uint positionY, uint positionZ, uint seed = 0) {
		return Noise(positionX + PRIME0 * positionY + PRIME1 * positionZ, seed);
	}
	public static uint Noise4D(uint positionX, uint positionY, uint positionZ, uint positionW, uint seed = 0) {
		return Noise(positionX + PRIME0 * positionY + PRIME1 * positionZ + PRIME2 * positionW, seed);
	}
}