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update rust example

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This commit is contained in:
Dennis Ranke
2022-01-01 15:51:18 +01:00
parent 397ff19d80
commit 6a75988489
3 changed files with 15 additions and 7 deletions
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14
examples/rust/tunnel.rs
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@@ -9,12 +9,20 @@ mod env {
extern "C" {
pub fn atan2(x: f32, y: f32) -> f32;
}
extern "C" {
pub fn time() -> f32;
}
}
fn atan2(x: f32, y: f32) -> f32 {
unsafe { env::atan2(x, y) }
}
fn time() -> f32 {
unsafe { env::time() }
}
fn sqrt(v: f32) -> f32 {
unsafe { core::intrinsics::sqrtf32(v) }
}
@@ -29,14 +37,14 @@ fn ftoi(v: f32) -> i32 {
}
#[no_mangle]
pub fn tic(time: i32) {
pub fn upd() {
for i in 0..320 * 240 {
let t = time as f32 / 10 as f32;
let t = time() * 63 as f32;
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;
let c = (ftoi(d + t * 2 as f32) ^ ftoi(u + t)) as u8 >> 4;
unsafe {
*((120 + i) as *mut u8) = c;
}