luaur-vm 0.1.3

The Luau register virtual machine and standard library (Rust).
Documentation 
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use crate::functions::perlin_fade::perlin_fade;
use crate::functions::perlin_grad::perlin_grad;
use crate::functions::perlin_lerp::perlin_lerp;

#[rustfmt::skip]
const K_PERLIN_HASH: [u8; 512] = [
    151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103, 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148,
    247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35, 11, 32, 57, 177, 33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175,
    74, 165, 71, 134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54,
    65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169, 200, 196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64,
    52, 217, 226, 250, 124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170, 213,
    119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167, 43, 172, 9, 129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104,
    218, 246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241, 81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157,
    184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180,
    151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103, 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148,
    247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35, 11, 32, 57, 177, 33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175,
    74, 165, 71, 134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54,
    65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169, 200, 196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64,
    52, 217, 226, 250, 124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170, 213,
    119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167, 43, 172, 9, 129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104,
    218, 246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241, 81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157,
    184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180,
];

pub fn perlin(x: f32, y: f32, z: f32) -> f32 {
    let xflr = x.floor();
    let yflr = y.floor();
    let zflr = z.floor();

    let xi = (xflr as i32) & 255;
    let yi = (yflr as i32) & 255;
    let zi = (zflr as i32) & 255;

    let xf = x - xflr;
    let yf = y - yflr;
    let zf = z - zflr;

    let u = perlin_fade(xf);
    let v = perlin_fade(yf);
    let w = perlin_fade(zf);

    let p = &K_PERLIN_HASH;

    let a = (p[xi as usize] as i32 + yi) & 255;
    let aa = (p[a as usize] as i32 + zi) & 255;
    let ab = (p[(a + 1) as usize] as i32 + zi) & 255;

    let b = (p[(xi + 1) as usize] as i32 + yi) & 255;
    let ba = (p[b as usize] as i32 + zi) & 255;
    let bb = (p[(b + 1) as usize] as i32 + zi) & 255;

    let la = perlin_lerp(
        u,
        perlin_grad(p[aa as usize] as i32, xf, yf, zf),
        perlin_grad(p[ba as usize] as i32, xf - 1.0, yf, zf),
    );
    let lb = perlin_lerp(
        u,
        perlin_grad(p[ab as usize] as i32, xf, yf - 1.0, zf),
        perlin_grad(p[bb as usize] as i32, xf - 1.0, yf - 1.0, zf),
    );
    let la1 = perlin_lerp(
        u,
        perlin_grad(p[(aa + 1) as usize] as i32, xf, yf, zf - 1.0),
        perlin_grad(p[(ba + 1) as usize] as i32, xf - 1.0, yf, zf - 1.0),
    );
    let lb1 = perlin_lerp(
        u,
        perlin_grad(p[(ab + 1) as usize] as i32, xf, yf - 1.0, zf - 1.0),
        perlin_grad(p[(bb + 1) as usize] as i32, xf - 1.0, yf - 1.0, zf - 1.0),
    );

    perlin_lerp(w, perlin_lerp(v, la, lb), perlin_lerp(v, la1, lb1))
}