58 lines
2.3 KiB
Rust
58 lines
2.3 KiB
Rust
use crate::lib8::interpolate::*;
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const NOISE_CUBE: [u8; 257] = [
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151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225,
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140, 36, 103, 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148,
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247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35, 11, 32,
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57, 177, 33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175,
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74, 165, 71, 134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122,
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60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54,
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65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169,
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200, 196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64,
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52, 217, 226, 250, 124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212,
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207, 206, 59, 227, 47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170, 213,
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119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167, 43, 172, 9,
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129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104,
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218, 246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241,
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81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157,
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184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93,
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222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180,
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151];
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const fn get_cube(x: u8) -> u8 {
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NOISE_CUBE[x as usize]
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}
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fn inoise8_raw(x_src: u16, y_src: u16) -> i8 {
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let x = x_src.wrapping_shr(8) as u8;
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let y = y_src.wrapping_shr(8) as u8;
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let a = get_cube(x) + y;
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let aa = get_cube(a);
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let ab = get_cube(a+1);
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let b = get_cube(x+1) + y;
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let ba = get_cube(b);
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let bb = get_cube(b+1);
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let mut u = x_src as u8;
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let mut v = y_src as u8;
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let xx = ((x_src as u8).wrapping_shr(1) & 0x7f) as i8;
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let yy = ((y_src as u8).wrapping_shr(1) & 0x7f) as i8;
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let n = 0x80u8 as i8;
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u = ease8InOutQuad(u);
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v = ease8InOutQuad(v);
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let x1 = lerp7by8(grad8(get_cube(aa), xx, yy), grad8(get_cube(ba), xx.wrapping_sub(n), yy), u);
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let x2 = lerp7by8(grad8(get_cube(ab), xx, yy.wrapping_sub(n)), grad8(get_cube(bb), xx.wrapping_sub(n), yy.wrapping_sub(n)), u);
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return lerp7by8(x1, x2, v);
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}
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pub fn inoise8(x: i16, y: i16) -> u8 {
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let mut n = inoise8_raw(x as u16, y as u16);
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n = n.wrapping_add(64);
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return (n as u8).saturating_add(n as u8);
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}
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