Add UwUSeeder

src/seeder.rs

@@ -0,0 +1,37 @@
+use std::hash::Hasher;
+
+use ahash::AHasher;
+use rand::distributions::uniform::{SampleRange, SampleUniform};
+use rand::{Rng, RngCore, SeedableRng};
+use rand_xoshiro::Xoshiro256Plus;
+
+pub struct UwUSeeder {
+    rng: Xoshiro256Plus,
+}
+
+impl UwUSeeder {
+    #[inline]
+    pub fn new(word: &[u8], random: bool) -> UwUSeeder {
+        let rand_u64 = if !random {
+            let mut hasher = AHasher::new_with_keys(0, 0);
+            hasher.write(word);
+            hasher.finish()
+        } else {
+            rand::rngs::OsRng::default().next_u64()
+        };
+
+        UwUSeeder {
+            rng: Xoshiro256Plus::seed_from_u64(rand_u64),
+        }
+    }
+
+    #[inline]
+    pub fn random_float(&mut self) -> f64 {
+        self.rng.gen_range(0.0..1.0)
+    }
+
+    #[inline]
+    pub fn random_int<T: SampleUniform, R: SampleRange<T>>(&mut self, range: R) -> T {
+        self.rng.gen_range(range)
+    }
+}