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trey decoder 2.0

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Quaternions 2024-12-31 01:57:22 -08:00
parent 9003f88a9d
commit 716354df2b
1 changed files with 7 additions and 41 deletions
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48
src/v1.rs
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@ -1,53 +1,19 @@
use binrw::{binrw,BinReaderExt,io::TakeSeekExt};
// whatever this is
// the bit chunks are deposited in reverse
fn trey_float(f:f32)->f32{
let bits=f.to_bits();
let s=bits&1!=0;
let e=((bits>>1)&((1<<8)-1)) as i32;
let s=bits&1;
let e=(bits>>1)&((1<<8)-1);
let m=(bits>>(1+8))&((1<<23)-1);
if e==255{
if m==0{
if s{
f32::NEG_INFINITY
}else{
f32::INFINITY
}
}else if m==1{
f32::NAN
}else{
// this is supposed to be QNAN but idk how to say it in rust
f32::NAN
}
}else if e==0{
if s{-(m as f32)*2.0f32.powi(-149)}else{(m as f32)*2.0f32.powi(-149)}
}else{
if s{-(m as f32/2.0f32.powi(23)+1.0)*2.0f32.powi(e-127)}else{(m as f32/2.0f32.powi(23)+1.0)*2.0f32.powi(e-127)}
}
f32::from_bits(m|(e<<23)|(s<<31))
}
fn trey_double(f:f64)->f64{
let bits=f.to_bits();
let s=bits&1!=0;
let e=((bits>>1)&((1<<11)-1)) as i32;
let s=bits&1;
let e=(bits>>1)&((1<<11)-1);
let m=(bits>>(1+11))&((1<<52)-1);
if e==2047{
if m==0{
if s{
f64::NEG_INFINITY
}else{
f64::INFINITY
}
}else if m==1{
f64::NAN
}else{
// this is supposed to be QNAN but idk how to say it in rust
f64::NAN
}
}else if e==0{
if s{-(m as f64)*2.0f64.powi(-1074)}else{(m as f64)*2.0f64.powi(-1074)}
}else{
if s{-(m as f64/2.0f64.powi(52)+1.0)*2.0f64.powi(e-1023)}else{(m as f64/2.0f64.powi(52)+1.0)*2.0f64.powi(e-1023)}
}
f64::from_bits(m|(e<<52)|(s<<63))
}
#[binrw]