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Removed unsafe from finvsqrt

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ccgauche 2021-01-05 17:50:09 +01:00 committed by Joshua Barretto
parent 454d9d0b75
commit 0eaf8492a5
1 changed files with 2 additions and 13 deletions
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15
world/src/layer/tree.rs
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@ -287,19 +287,8 @@ impl ProceduralTree {
if !is_leave {
#[allow(unsafe_code)]
fn finvsqrt(x: f32) -> f32 {
// Magic number based on Chris Lomont work:
// const MAGIC_U32: u32 = 0x5f375a86;
// The Original Magic Number:
// const MAGIC_32: u32 = 0x5f3759df;
const THREEHALFS: f32 = 1.5f32;
let x2: f32 = x * 0.5f32;
let mut i: u32 = unsafe { std::mem::transmute(x) };// evil floating point bit level hacking
i = 0x5f375a86 - (i >> 1); // what the fuck?
let y: f32 = unsafe { std::mem::transmute(i) };
let y = y * ( THREEHALFS - ( x2 * y * y ) ); // 1st iteration
// let y = y * (threehalfs - (x2 * y * y)); // 2nd iteration, this can be removed
y
let y = f32::from_bits(0x5f375a86 - (x.to_bits() >> 1));
y * (1.5 - ( x * 0.5 * y * y ))
}
if branch.health * finvsqrt(p_d2) > 1.0 {
is_leave = true;