Compute graph example - multiple outputs?

[aparks5]

Hi,
Are multiple outputs possible in apps based on the compute graph example?

I know that imnodes can certainly render multiple output pins, but it looks like if for example:

ImNodes::BeginNode(params[NODEID])
...
ImNodes::BeginOutputAttribute(params[NODE_ID]);
ImNodes::EndOutputAttribute();
ImNodes::EndNode();

will correctly display one output pin. I have observed that linking will not work unless NODE_ID matches Node and OutputAttribute.
However, additional outputs such as:

ImNodes::BeginOutputAttribute(params[STEREO_L]);
ImNodes::EndOutputAttribute();
ImNodes::BeginOutputAttribute(params[STEREO_R]);
ImNodes::EndOutputAttribute();
ImNodes::EndNode();

make it impossible to link to another node.

Multiple inputs are quite easy to deal with.

Perhaps I need to dig into graph.h to understand why there is the expectation that in order for Nodes to link to each other the NODE_ID needs to match the Output attribute ID.

Many thanks
-Anthony

[aparks5]

UPDATE: I SOLVED IT (but it wasn't easy and I still don't know exactly why this works)

Since Links don't display for Values, I needed to create another value type node called a "Relay" whose sole is to allow me to call push() multiple times in a node.

I am able to create multiple outputs by calling process() on a Node in a circular way.

ADDITIONALLY
another edge needs to be created from the output to the node id. It is backwards from the inputs.
e.g.

	else if (ImGui::IsKeyReleased((ImGuiKey)SDL_SCANCODE_M)) {
			auto node = std::make_shared<MIDI>();
			auto extra = std::make_shared<Relay>();
			auto id = m_graph.insert_node(node);
			auto extraId = m_graph.insert_node(extra);
			m_graph.insert_edge(extraId, id);
			node->params[MIDI::NODE_ID] = id;
			node->params[MIDI::EXTRA_OUT_ID] = extraId;
			m_nodes.push_back(node);
			// outputs have to be inserted after the process node
			const ImVec2 click_pos = ImGui::GetMousePosOnOpeningCurrentPopup();
			ImNodes::SetNodeScreenSpacePos(id, click_pos);
		}

MIDI::process()
{
// fill voices etc.
...
	// N calls to process will return N voices
	// this module should push N values to the stack
	float val = m_voices[m_cycle];
	m_cycle++;
	if (m_cycle >= m_voices.size()) {
		m_cycle = 0;
	}
	return m_voices[m_cycle];

}