Darken incompatible PortWidgets when creating cables, instead of making them translucent. Make darkness dependent on room brightness.

dep/nanovg

@@ -1 +1 @@
-Subproject commit 9b5c4109a04734bad6459422531272c3327afde4
+Subproject commit ade6e6c060504002a4409fb0943432cf5c494872

src/app/CableWidget.cpp

@@ -160,7 +160,7 @@ static void CableWidget_drawCable(CableWidget* that, const widget::Widget::DrawA
 	if (opacity > 0.0) {
 		nvgSave(args.vg);
 		// This power scaling looks more linear than actual linear scaling
-		nvgGlobalAlpha(args.vg, std::pow(opacity, 1.5));
+		nvgAlpha(args.vg, std::pow(opacity, 1.5));
 
 		float dist = pos1.minus(pos2).norm();
 		math::Vec slump;

src/app/PortWidget.cpp

@@ -158,8 +158,9 @@ void PortWidget::draw(const DrawArgs& args) {
 	CableWidget* cw = APP->scene->rack->incompleteCable;
 	if (cw) {
 		// Dim the PortWidget if the active cable cannot plug into this PortWidget
-		if (type == engine::Port::OUTPUT ? cw->outputPort : cw->inputPort)
-			nvgGlobalAlpha(args.vg, 0.5);
+		if (type == engine::Port::OUTPUT ? cw->outputPort : cw->inputPort) {
+			nvgTint(args.vg, nvgRGBf(0.33, 0.33, 0.33));
+		}
 	}
 	Widget::draw(args);
 }