When patching wires, invalid ports are rendered at 50% opacity

include/components.hpp

@@ -77,38 +77,41 @@ struct BefacoSlidePot : SpriteKnob {
 // Jacks
 ////////////////////
 
-struct PJ301M : SpriteWidget {
+template <typename BASE>
+struct PJ301M : BASE {
 	PJ301M() {
-		box.size = Vec(24, 24);
-		spriteOffset = Vec(-2, -2);
-		spriteSize = Vec(30, 30);
-		spriteImage = Image::load("res/ComponentLibrary/PJ301M.png");
+		this->box.size = Vec(24, 24);
+		this->spriteOffset = Vec(-2, -2);
+		this->spriteSize = Vec(30, 30);
+		this->spriteImage = Image::load("res/ComponentLibrary/PJ301M.png");
 	}
 };
-struct InputPortPJ301M : InputPort, PJ301M {};
-struct OutputPortPJ301M: OutputPort, PJ301M {};
+typedef PJ301M<InputPort> InputPortPJ301M;
+typedef PJ301M<OutputPort> OutputPortPJ301M;
 
-struct PJ3410 : SpriteWidget {
+template <typename BASE>
+struct PJ3410 : BASE {
 	PJ3410() {
-		box.size = Vec(32, 32);
-		spriteOffset = Vec(-1, -1);
-		spriteSize = Vec(36, 36);
-		spriteImage = Image::load("res/ComponentLibrary/PJ3410.png");
+		this->box.size = Vec(32, 32);
+		this->spriteOffset = Vec(-1, -1);
+		this->spriteSize = Vec(36, 36);
+		this->spriteImage = Image::load("res/ComponentLibrary/PJ3410.png");
 	}
 };
-struct InputPortPJ3410 : InputPort, PJ3410 {};
-struct OutputPortPJ3410: OutputPort, PJ3410 {};
+typedef PJ3410<InputPort> InputPortPJ3410;
+typedef PJ3410<OutputPort> OutputPortPJ3410;
 
-struct CL1362 : SpriteWidget {
+template <typename BASE>
+struct CL1362 : BASE {
 	CL1362() {
-		box.size = Vec(33, 29);
-		spriteOffset = Vec(-2, -2);
-		spriteSize = Vec(39, 36);
-		spriteImage = Image::load("res/ComponentLibrary/CL1362.png");
+		this->box.size = Vec(33, 29);
+		this->spriteOffset = Vec(-2, -2);
+		this->spriteSize = Vec(39, 36);
+		this->spriteImage = Image::load("res/ComponentLibrary/CL1362.png");
 	}
 };
-struct InputPortCL1362 : InputPort, CL1362 {};
-struct OutputPortCL1362 : OutputPort, CL1362 {};
+typedef CL1362<InputPort> InputPortCL1362;
+typedef CL1362<OutputPort> OutputPortCL1362;
 
 ////////////////////
 // Misc

include/scene.hpp

@@ -168,7 +168,7 @@ struct MomentarySwitch : virtual Switch {
 // ports
 ////////////////////
 
-struct Port : OpaqueWidget {
+struct Port : OpaqueWidget, SpriteWidget {
 	Module *module = NULL;
 	WireWidget *connectedWire = NULL;
 
@@ -187,6 +187,7 @@ struct InputPort : Port {
 	void onDragDrop(Widget *origin);
 	void onDragEnter(Widget *origin);
 	void onDragLeave(Widget *origin);
+	void draw(NVGcontext *vg);
 };
 
 struct OutputPort : Port {
@@ -196,6 +197,7 @@ struct OutputPort : Port {
 	void onDragDrop(Widget *origin);
 	void onDragEnter(Widget *origin);
 	void onDragLeave(Widget *origin);
+	void draw(NVGcontext *vg);
 };
 
 ////////////////////

src/widgets/InputPort.cpp

@@ -42,4 +42,12 @@ void InputPort::onDragLeave(Widget *origin) {
 	}
 }
 
+void InputPort::draw(NVGcontext *vg) {
+	if (gRackWidget->activeWire) {
+		if (gRackWidget->activeWire->inputPort)
+			nvgGlobalAlpha(vg, 0.5);
+	}
+	SpriteWidget::draw(vg);
+}
+
 } // namespace rack

src/widgets/OutputPort.cpp

@@ -42,4 +42,12 @@ void OutputPort::onDragLeave(Widget *origin) {
 	}
 }
 
+void OutputPort::draw(NVGcontext *vg) {
+	if (gRackWidget->activeWire) {
+		if (gRackWidget->activeWire->outputPort)
+			nvgGlobalAlpha(vg, 0.5);
+	}
+	SpriteWidget::draw(vg);
+}
+
 } // namespace rack