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base: go:2b231f215519efdad6555b6a58e8c17fe9567c22
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go:main
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compare: go:9babdba06f5a3a8e797381d1d785e4443c512020
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go:main

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2 changed files with 0 additions and 29 deletions
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27
fastsqrt/fastsqrt.go
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@ -1,27 +0,0 @@
package fastsqrt
import "math"
const magic32 = 0x5F375A86
func FastInvSqrt32(n float32) float32 {
// If n is negative return NaN
if n < 0 {
return float32(math.NaN())
} // n2 and th are for one iteration of Newton's method later
n2, th := n*0.5, float32(1.5) // Use math.Float32bits to represent the float32, n, as
// an uint32 without modification.
b := math.Float32bits(n) // Use the new uint32 view of the float32 to shift the bits
// of the float32 1 to the right, chopping off 1 bit from
// the fraction part of the float32.
b = magic32 - (b >> 1) // Use math.Float32frombits to convert the uint32 bits back
// into their float32 representation, again no actual change
// in the bits, just a change in how we treat them in memory.
// f is now our answer of 1 / sqrt(n)
f := math.Float32frombits(b) // Perform one iteration of Newton's method on f to improve
// accuracy
f *= th - (n2 * f * f)
// And return our fast inverse square root result
return f
}

2
main.go
View File

@ -44,8 +44,6 @@ func main() {
fAY := -float32(AY) * config.Config.Gain * float32(scale)
fBX := float32(BX) * config.Config.Gain * float32(scale)
fBY := -float32(BY) * config.Config.Gain * float32(scale)
//inv := fastsqrt.FastInvSqrt32((fBX-fAX)*(fBX-fAX) + (fBY-fBY)*(fBY-fBY))
//colorAdjusted := color.RGBA{config.AccentColor.R, config.AccentColor.G, config.AccentColor.B, uint8(255 * inv * config.Config.LineOpacity)}
rl.DrawLineEx(rl.NewVector2(float32(config.Config.WindowWidth/2)+fAX, float32(config.Config.WindowWidth/2)+fAY), rl.NewVector2(float32(config.Config.WindowWidth/2)+fBX, float32(config.Config.WindowWidth/2)+fBY), config.Config.LineThickness, config.AccentColor)
AX = BX
AY = BY