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Improved hash RNG function instability and speed

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This commit is contained in:
Joshua Barretto 2019-06-22 18:37:48 +01:00
parent b94c0ace8c
commit 86f13af8cb
1 changed files with 15 additions and 16 deletions
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31
world/src/util/random.rs
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@ -18,21 +18,20 @@ impl Sampler for RandomField {
fn get(&self, pos: Self::Index) -> Self::Sample {
let pos = pos.map(|e| (e * 13 + (1 << 31)) as u32);
let next = self.seed.wrapping_mul(0x168E3D1F).wrapping_add(0xDEADBEAD);
let next = next
.wrapping_mul(133227)
.wrapping_add(pos.x);
let next = next.rotate_left(13).wrapping_add(318912) ^ 0x42133742;
let next = next
.wrapping_mul(938219)
.wrapping_add(pos.y);
let next = next.rotate_left(13).wrapping_add(318912) ^ 0x23341753;
let next = next
.wrapping_mul(938219)
.wrapping_add(pos.z);
let next = next.wrapping_add(313322) ^ 0xDEADBEEF;
let next = next.wrapping_sub(929009) ^ 0xFF329DE3;
let next = next.wrapping_add(422671) ^ 0x42892942;
next.rotate_left(13)
let mut a = self.seed;
a = (a ^ 61) ^ (a >> 16);
a = a + (a << 3);
a = a ^ pos.x;
a = a ^ (a >> 4);
a = a * 0x27d4eb2d;
a = a ^ (a >> 15);
a = a ^ pos.y;
a = (a ^ 61) ^ (a >> 16);
a = a + (a << 3);
a = a ^ (a >> 4);
a = a ^ pos.z;
a = a * 0x27d4eb2d;
a = a ^ (a >> 15);
a
}
}