use super::*;
#[doc(no_inline)]
pub use rand::distributions::Distribution;
#[doc(no_inline)]
pub use rand::seq::{IteratorRandom as _, SliceRandom as _};
#[doc(no_inline)]
pub use rand::{self, rngs::StdRng, Rng, RngCore, SeedableRng};
pub mod distributions {
use super::*;
#[doc(no_inline)]
pub use rand::distributions::*;
pub struct UnitCircleInside;
impl Distribution<Vec2<f32>> for UnitCircleInside {
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Vec2<f32> {
let r = rng.gen_range(0.0..=1.0).sqrt();
let a = rng.gen_range(0.0..=2.0 * std::f32::consts::PI);
vec2(r * a.sin(), r * a.cos())
}
}
}
pub fn global_rng() -> impl Rng {
#[cfg(target_arch = "wasm32")]
{
static GLOBAL_RNG: once_cell::sync::Lazy<Mutex<StdRng>> =
once_cell::sync::Lazy::new(|| {
fn gen_byte() -> u8 {
(js_sys::Math::random() * 256.0).clamp(0.0, 255.0) as u8
}
let mut seed: [mem::MaybeUninit<u8>; 32] =
unsafe { mem::MaybeUninit::uninit().assume_init() };
for elem in &mut seed {
unsafe {
std::ptr::write(elem.as_mut_ptr(), gen_byte());
}
}
Mutex::new(rand::SeedableRng::from_seed(unsafe {
mem::transmute(seed)
}))
});
struct GlobalRng;
impl RngCore for GlobalRng {
fn next_u32(&mut self) -> u32 {
GLOBAL_RNG.lock().unwrap().next_u32()
}
fn next_u64(&mut self) -> u64 {
GLOBAL_RNG.lock().unwrap().next_u64()
}
fn fill_bytes(&mut self, dest: &mut [u8]) {
GLOBAL_RNG.lock().unwrap().fill_bytes(dest);
}
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), rand::Error> {
GLOBAL_RNG.lock().unwrap().try_fill_bytes(dest)
}
}
GlobalRng
}
#[cfg(not(target_arch = "wasm32"))]
rand::thread_rng()
}
#[test]
fn test_random() {
macro_rules! test_types {
($($t:ty,)*) => {
$(eprintln!("random {:?} = {:?}", stringify!($t), global_rng().gen::<$t>());)*
};
}
test_types!(i8, i16, i32, i64, isize, u8, u16, u32, u64, usize, char, f32, f64,);
}