package main

import (
	"math"
	"github.com/gen2brain/raylib-go/raylib"
)

func clamp01(v float32) float32 {
	if v < 0 {
		return 0
	}
	if v > 1 {
		return 1
	}
	return v
}

func GrayCurve(v, k float32) rl.Color {
	v = float32(math.Pow(float64(clamp01(v)), float64(k))) // k < 1 boosts highlights, k > 1 boosts shadows
	c := uint8(v * 255)
	return rl.Color{R: c, G: c, B: c, A: 255}
}