30 lines
540 B
Go
30 lines
540 B
Go
package main
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import (
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"github.com/gen2brain/raylib-go/raylib"
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"math"
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)
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func clamp01(v float32) float32 {
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if v < 0 {
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return 0
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}
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if v > 1 {
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return 1
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}
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return v
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}
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func GrayCurve(v, k float32) rl.Color {
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v = float32(math.Pow(float64(clamp01(v)), float64(k))) // k < 1 boosts highlights, k > 1 boosts shadows
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c := uint8(v * 255)
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return rl.Color{R: c, G: c, B: c, A: 255}
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}
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func Brightness(c rl.Color) float32 {
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r := float32(c.R) / 255
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g := float32(c.G) / 255
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b := float32(c.B) / 255
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return 0.2126*r + 0.7152*g + 0.0722*b
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}
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