Add VUMeter2.

include/dsp/vumeter.hpp

@@ -6,6 +6,7 @@ namespace rack {
 namespace dsp {
 
 
+/** Deprecated. */
 struct VUMeter {
 	/** Decibel level difference between adjacent meter lights */
 	float dBInterval = 3.0;
@@ -29,5 +30,51 @@ struct VUMeter {
 };
 
 
+struct VUMeter2 {
+	enum Mode {
+		PEAK,
+		RMS
+	};
+	Mode mode = PEAK;
+	float v = 0.f;
+	/** Inverse time constant in 1/seconds */
+	float lambda = 0.f;
+
+	void reset() {
+		v = 0.f;
+	}
+
+	void process(float deltaTime, float value) {
+		if (mode == PEAK) {
+			value = std::abs(value);
+			if (value >= v) {
+				v = value;
+			}
+			else {
+				v += (value - v) * lambda * deltaTime;
+			}
+		}
+		else {
+			value = std::pow(value, 2);
+			v += (value - v) * lambda * deltaTime;
+		}
+	}
+
+	/** Returns the LED brightness measuring tick marks between dbMin and dbMax.
+	Set dbMin == dbMax == 0.f for a clip indicator.
+	Expensive, so call this infrequently.
+	*/
+	float getBrightness(float dbMin, float dbMax) {
+		float db = amplitudeToDb((mode == RMS) ? std::sqrt(v) : v);
+		if (db > dbMax)
+			return 1.f;
+		else if (db < dbMin)
+			return 0.f;
+		else
+			return math::rescale(db, dbMin, dbMax, 0.f, 1.f);
+	}
+};
+
+
 } // namespace dsp
 } // namespace rack

src/window.cpp

@@ -208,7 +208,6 @@ Window::Window() {
 	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
 	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
 #endif
-	glfwWindowHint(GLFW_MAXIMIZED, GLFW_TRUE);
 	glfwWindowHint(GLFW_DOUBLEBUFFER, GLFW_TRUE);
 
 	internal->lastWindowTitle = "";