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better smooth-linear function

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minjaesong
2023-07-30 18:35:36 +09:00
parent 91cf08e93a
commit f4bfe84009
1 changed files with 17 additions and 3 deletions
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20
src/net/torvald/terrarum/modulebasegame/clut/Skybox.kt
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@@ -1,6 +1,5 @@
package net.torvald.terrarum.modulebasegame.clut
import com.badlogic.gdx.graphics.Color
import com.badlogic.gdx.graphics.Pixmap
import com.badlogic.gdx.graphics.Texture
import com.badlogic.gdx.utils.Disposable
@@ -13,7 +12,6 @@ import net.torvald.terrarum.App
import net.torvald.terrarum.App.printdbg
import net.torvald.terrarum.abs
import net.torvald.terrarum.modulebasegame.worldgenerator.HALF_PI
import java.lang.Math.pow
import kotlin.math.*
/**
@@ -128,7 +126,23 @@ object Skybox : Disposable {
private fun Double.coerceInSmoothly(low: Double, high: Double): Double {
val x = this.coerceIn(low, high)
val x2 = ((x - low) * (high - low).pow(-1.0))
return FastMath.interpolateLinear(polynomialDecay2(0.5, 2, x2), low, high)
// return FastMath.interpolateLinear(polynomialDecay2(0.5, 2, x2), low, high)
return FastMath.interpolateLinear(smoothLinear(x2), low, high)
}
/**
* To get the idea what the fuck is going on here, please refer to https://www.desmos.com/calculator/d2otu5deub
*/
private fun smoothLinear(x: Double): Double {
val k = 0.11269 // a magic number
val d = 1.127016653 // also a magic number
val a = -1.0 / 0.2
return if (x < k)
-a.pow(1) * x.pow(2)
else if (x > 1.0 - k)
a.pow(1) * (1.0 - x).pow(2) + 1.0
else
d * (x - 0.5) + 0.5
}
private fun getTexturmaps(albedo: Double): Array<Texture> {