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port rust tunnel example to zig

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This commit is contained in:
Dennis Ranke
2022-01-02 13:58:56 +01:00
parent 26206a312a
commit 88ee0e1bef
7 changed files with 77 additions and 12 deletions
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15
examples/rust/tunnel.rs
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@@ -38,16 +38,21 @@ fn ftoi(v: f32) -> i32 {
#[no_mangle]
pub fn upd() {
for i in 0..320 * 240 {
let t = time() * 63 as f32;
let mut i: i32 = 0;
loop {
let t = time() * 63.;
let x = (i % 320 - 160) as f32;
let y = (i / 320 - 120) as f32;
let d = 40000 as f32 / sqrt(x * x + y * y + 1 as f32);
let u = atan2(x, y) * 512f32 / 3.141;
let c = (ftoi(d + t * 2 as f32) ^ ftoi(u + t)) as u8 >> 4;
let d = 40000 as f32 / sqrt(x * x + y * y + 1.);
let u = atan2(x, y) * 512. / 3.141;
let c = (ftoi(d + t * 2.) ^ ftoi(u + t)) as u8 >> 4;
unsafe {
*((120 + i) as *mut u8) = c;
}
i += 1;
if i >= 320*240 {
break;
}
}
}