adjust materials

src/main/kotlin/Util.kt

@@ -1,6 +1,7 @@
 package gay.pizza.CavesOfJolk
 
 import com.badlogic.gdx.graphics.Color
+import com.badlogic.gdx.math.MathUtils
 import com.badlogic.gdx.math.Vector2
 import ktx.math.div
 import ktx.math.times
@@ -51,3 +52,9 @@ fun Color.lighten(ld: Double): Color
 	val rgb = HUSLColorConverter.hsluvToRgb(hsl)
 	return Color(rgb[0].toFloat(), rgb[1].toFloat(), rgb[2].toFloat(), a)
 }
+
+fun Color.mix(rhs: Color, x: Float) = Color(
+	MathUtils.lerp(this.r, rhs.r, x),
+	MathUtils.lerp(this.g, rhs.g, x),
+	MathUtils.lerp(this.b, rhs.b, x),
+	MathUtils.lerp(this.a, rhs.a, x))