Move decay computation to new method

src/main/java/net/coderbot/iris/uniforms/transforms/SmoothedFloat.java

@@ -80,12 +80,7 @@ private void update() {
 		// xₜ
 		float newValue = unsmoothed.getAsFloat();
 
-		// Compute the decay constant from the half life
-		// https://en.wikipedia.org/wiki/Exponential_decay#Measuring_rates_of_decay
-		// https://en.wikipedia.org/wiki/Exponential_smoothing#Time_constant
-		double timeConstant = (newValue > this.accumulator ? halfLifeUp : halfLifeDown) / LN_OF_2;
-		// k = 1 / τ
-		this.decayConstant = (float) (1.0f / timeConstant);
+		computeDecay(newValue > this.accumulator ? halfLifeUp : halfLifeDown);
 
 		// Implements the basic variant of exponential smoothing
 		// https://en.wikipedia.org/wiki/Exponential_smoothing#Basic_(simple)_exponential_smoothing_(Holt_linear)
@@ -101,6 +96,14 @@ private void update() {
 		accumulator = lerp(accumulator, newValue, smoothingFactor);
 	}
 
+	private void computeDecay(float halfLife) {
+		// Compute the decay constant from the half life
+		// https://en.wikipedia.org/wiki/Exponential_decay#Measuring_rates_of_decay
+		// https://en.wikipedia.org/wiki/Exponential_smoothing#Time_constant
+		// k = 1 / τ
+		this.decayConstant = (float) (1.0f / (halfLife / LN_OF_2));
+	}
+
 	/**
 	 * @return the current smoothed value
 	 */