Add Light::setBrightnessSmooth()

include/engine.hpp

@@ -30,8 +30,9 @@ struct Output {
 };
 
 struct Light {
+	/** The square of the brightness value */
 	float value = 0.0;
-	void setSmooth(float v);
+	void setBrightnessSmooth(float brightness);
 };
 
 

src/engine.cpp

@@ -33,8 +33,8 @@ static int smoothParamId;
 static float smoothValue;
 
 
-void Light::setSmooth(float v) {
-	value += (v - value) / sampleRate * 60.0;
+void Light::setBrightnessSmooth(float brightness) {
+	value += (powf(brightness, 2) - value) / sampleRate * 60.0;
 }