Tweak LightWidget rendering

src/app/ColorLightWidget.cpp

@@ -11,10 +11,12 @@ void ColorLightWidget::addColor(NVGcolor c) {
 
 void ColorLightWidget::step() {
 	assert(module);
+	assert(module->lights.size() >= lightId + colors.size());
 	color = nvgRGBf(0, 0, 0);
 	for (int i = 0; i < (int)colors.size(); i++) {
 		NVGcolor c = colors[i];
 		float brightness = module->lights[lightId + i].getBrightness();
+		brightness = clampf(brightness, 0.0, 1.0);
 		color.r += c.r * brightness;
 		color.g += c.g * brightness;
 		color.b += c.b * brightness;

src/app/LightWidget.cpp

@@ -8,6 +8,11 @@ void LightWidget::draw(NVGcontext *vg) {
 	float radius = box.size.x / 2.0;
 	float oradius = radius + 20.0;
 
+	color.r = clampf(color.r, 0.0, 1.0);
+	color.g = clampf(color.g, 0.0, 1.0);
+	color.b = clampf(color.b, 0.0, 1.0);
+	color.a = clampf(color.a, 0.0, 1.0);
+
 	// Solid
 	nvgBeginPath(vg);
 	nvgCircle(vg, radius, radius, radius);

src/engine.cpp

@@ -35,11 +35,11 @@ static float smoothValue;
 
 
 float Light::getBrightness() {
-	return sqrtf(value);
+	return sqrtf(fmaxf(0.0, value));
 }
 
 void Light::setBrightnessSmooth(float brightness) {
-	value += (brightness * brightness - value) * sampleTime * 60.0;
+	value += (brightness * brightness - value) * sampleTime * (60.0 * 3.0);
 }