Header file tweaks

include/dsp/frame.hpp

@@ -9,6 +9,8 @@ namespace rack {
 template <size_t CHANNELS>
 struct Frame {
 	float samples[CHANNELS];
+
+	Frame() {}
 };
 
 } // namespace rack

include/dsp/functions.hpp

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <cmath>
+#include "util/math.hpp"
 
 
 namespace rack {
@@ -42,5 +42,13 @@ inline float exponentialBipolar(float b, float x) {
 	return (powf(b, x) - powf(b, -x)) / a;
 }
 
+inline float gainToDb(float gain) {
+	return log10f(gain) * 20.f;
+}
+
+inline float dbToGain(float db) {
+	return powf(10.f, db / 20.f);
+}
+
 
 } // namespace rack

include/util/color.hpp

@@ -54,5 +54,10 @@ inline NVGcolor colorScreen(NVGcolor a, NVGcolor b) {
 	return c;
 }
 
+inline NVGcolor colorAlpha(NVGcolor a, float alpha) {
+	a.a *= alpha;
+	return a;
+}
+
 
 } // namespace rack

include/widgets.hpp

@@ -7,6 +7,7 @@
 
 #include "util/common.hpp"
 #include "events.hpp"
+#include "util/color.hpp"
 
 
 namespace rack {
@@ -144,10 +145,10 @@ struct Widget {
 	/** Helper function for creating and initializing a Widget with certain arguments (in this case just the position).
 	In this project, you will find this idiom everywhere, as an easier alternative to constructor arguments, for building a Widget (or a subclass) with a one-liner.
 	Example:
-		addChild(Widget::create<SVGWidget>(Vec(0, 0)))
+		addChild(Widget::create<SVGWidget>(Vec(10, 10)))
 	*/
 	template <typename T = Widget>
-	static T *create(Vec pos) {
+	static T *create(Vec pos = Vec()) {
 		T *o = new T();
 		o->box.pos = pos;
 		return o;