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Merge pull request #2661 from Beefster09/fixed-f64-conversion

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Fix conversions between fixed point numbers and f64
This commit is contained in:
gingerBill
2023-08-07 11:00:42 +01:00
committed by GitHub
parent 12b7df550f d4194962b0
commit 2a42dab108
1 changed files with 7 additions and 5 deletions
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12
core/math/fixed/fixed.odin
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@@ -29,13 +29,13 @@ Fixed52_12 :: distinct Fixed(i64, 12)
init_from_f64 :: proc(x: ^$T/Fixed($Backing, $Fraction_Width), val: f64) {
i, f := math.modf(val)
i, f := math.modf(math.abs(val))
x.i = Backing(f * (1<<Fraction_Width))
x.i &= 1<<Fraction_Width - 1
x.i |= Backing(i) << Fraction_Width
if val < 0 do x.i *= -1
}
init_from_parts :: proc(x: ^$T/Fixed($Backing, $Fraction_Width), integer, fraction: Backing) {
i, f := math.modf(val)
x.i = fraction
@@ -44,9 +44,11 @@ init_from_parts :: proc(x: ^$T/Fixed($Backing, $Fraction_Width), integer, fracti
}
to_f64 :: proc(x: $T/Fixed($Backing, $Fraction_Width)) -> f64 {
res := f64(x.i >> Fraction_Width)
res += f64(x.i & (1<<Fraction_Width-1)) / f64(1<<Fraction_Width)
return res
sign := -1.0 if x.i < 0 else 1.0
num := math.abs(x.i)
res := f64(num >> Fraction_Width)
res += f64(num & (1<<Fraction_Width-1)) / f64(1<<Fraction_Width)
return res * sign
}