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Rewrite diffusion function. Now has potential for a full avalanche.

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This commit is contained in:
Acrimon 2019-08-06 09:55:43 +02:00
parent 00b5a4a58e
commit cdf4c26be7
1 changed files with 7 additions and 3 deletions
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10
world/src/util/seed_expan.rs
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@ -1,8 +1,12 @@
/// Simple non-cryptographic diffusion function.
pub fn diffuse(mut x: u32) -> u32 {
x ^= 2281701376;
x = x.rotate_left(7);
x.wrapping_mul(0x811c9dc5)
x = x.wrapping_add(0x7ed55d16).wrapping_add(x << 12);
x = (x ^ 0xc761c23c) ^ (x >> 19);
x = x.wrapping_add(0x165667b1).wrapping_add(x << 5);
x = x.wrapping_add(0xd3a2646c) ^ (x << 9);
x = x.wrapping_add(0xfd7046c5).wrapping_add(x << 3);
x = (x ^ 0xb55a4f09) ^ (x >> 16);
x
}
/// Expand a 32 bit seed into a 32 byte RNG state.