Rack/src/Core/MIDICCToCVInterface.cpp

#include "Core.hpp"
#include "midi.hpp"
#include "dsp/filter.hpp"


struct MIDICCToCVInterface : Module {
	enum ParamIds {
		NUM_PARAMS
	};
	enum InputIds {
		NUM_INPUTS
	};
	enum OutputIds {
		ENUMS(CC_OUTPUT, 16),
		NUM_OUTPUTS
	};
	enum LightIds {
		NUM_LIGHTS
	};

	MidiInputQueue midiInput;
	int8_t ccs[128];
	ExponentialFilter ccFilters[16];

	int learningId = -1;
	int learnedCcs[16] = {};

	MIDICCToCVInterface() : Module(NUM_PARAMS, NUM_INPUTS, NUM_OUTPUTS, NUM_LIGHTS) {
		onReset();
	}

	void onReset() override {
		for (int i = 0; i < 128; i++) {
			ccs[i] = 0;
		}
		for (int i = 0; i < 16; i++) {
			learnedCcs[i] = i;
		}
		learningId = -1;
	}

	void step() override {
		MidiMessage msg;
		while (midiInput.shift(&msg)) {
			processMessage(msg);
		}

		float lambda = 100.f * engineGetSampleTime();
		for (int i = 0; i < 16; i++) {
			int learnedCc = learnedCcs[i];
			float value = rescale(clamp(ccs[learnedCc], -127, 127), 0, 127, 0.f, 10.f);
			ccFilters[i].lambda = lambda;
			outputs[CC_OUTPUT + i].value = ccFilters[i].process(value);
		}
	}

	void processMessage(MidiMessage msg) {
		switch (msg.status()) {
			// cc
			case 0xb: {
				uint8_t cc = msg.note();
				// Learn
				if (learningId >= 0 && ccs[cc] != msg.data2) {
					learnedCcs[learningId] = cc;
					learningId = -1;
				}
				// Set CV
				// Allow CC to be negative if the 8th bit is set
				ccs[cc] = msg.data2;
			} break;
			default: break;
		}
	}

	json_t *toJson() override {
		json_t *rootJ = json_object();

		json_t *ccsJ = json_array();
		for (int i = 0; i < 16; i++) {
			json_t *ccJ = json_integer(learnedCcs[i]);
			json_array_append_new(ccsJ, ccJ);
		}
		json_object_set_new(rootJ, "ccs", ccsJ);

		json_object_set_new(rootJ, "midi", midiInput.toJson());
		return rootJ;
	}

	void fromJson(json_t *rootJ) override {
		json_t *ccsJ = json_object_get(rootJ, "ccs");
		if (ccsJ) {
			for (int i = 0; i < 16; i++) {
				json_t *ccJ = json_array_get(ccsJ, i);
				if (ccJ)
					learnedCcs[i] = json_integer_value(ccJ);
			}
		}

		json_t *midiJ = json_object_get(rootJ, "midi");
		if (midiJ)
			midiInput.fromJson(midiJ);
	}
};


struct MidiCcChoice : GridChoice {
	MIDICCToCVInterface *module;
	int id;

	MidiCcChoice() {
		box.size.y = mm2px(6.666);
		textOffset.y -= 4;
	}

	void setId(int id) override {
		this->id = id;
	}

	void step() override {
		if (module->learningId == id) {
			text = "LRN";
			color.a = 0.5;
		}
		else {
			text = stringf("%d", module->learnedCcs[id]);
			color.a = 1.0;
			if (gFocusedWidget == this)
				gFocusedWidget = NULL;
		}
	}

	void onFocus(EventFocus &e) override {
		e.consumed = true;
		module->learningId = id;
	}

	void onDefocus(EventDefocus &e) override {
		module->learningId = -1;
	}
};


struct MidiCcWidget : Grid16MidiWidget {
	MIDICCToCVInterface *module;
	GridChoice *createGridChoice() override {
		MidiCcChoice *gridChoice = new MidiCcChoice();
		gridChoice->module = module;
		return gridChoice;
	}
};


struct MIDICCToCVInterfaceWidget : ModuleWidget {
	MIDICCToCVInterfaceWidget(MIDICCToCVInterface *module) : ModuleWidget(module) {
		setPanel(SVG::load(assetGlobal("res/Core/MIDICCToCVInterface.svg")));

		addChild(Widget::create<ScrewSilver>(Vec(RACK_GRID_WIDTH, 0)));
		addChild(Widget::create<ScrewSilver>(Vec(box.size.x - 2 * RACK_GRID_WIDTH, 0)));
		addChild(Widget::create<ScrewSilver>(Vec(RACK_GRID_WIDTH, RACK_GRID_HEIGHT - RACK_GRID_WIDTH)));
		addChild(Widget::create<ScrewSilver>(Vec(box.size.x - 2 * RACK_GRID_WIDTH, RACK_GRID_HEIGHT - RACK_GRID_WIDTH)));

		addOutput(Port::create<PJ301MPort>(mm2px(Vec(3.894335, 73.344704)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 0));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(15.494659, 73.344704)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 1));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(27.094982, 73.344704)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 2));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(38.693932, 73.344704)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 3));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(3.8943355, 84.945023)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 4));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(15.49466, 84.945023)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 5));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(27.094982, 84.945023)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 6));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(38.693932, 84.945023)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 7));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(3.8943343, 96.543976)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 8));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(15.494659, 96.543976)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 9));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(27.09498, 96.543976)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 10));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(38.693932, 96.543976)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 11));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(3.894335, 108.14429)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 12));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(15.49466, 108.14429)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 13));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(27.09498, 108.14429)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 14));
		addOutput(Port::create<PJ301MPort>(mm2px(Vec(38.693932, 108.14429)), Port::OUTPUT, module, MIDICCToCVInterface::CC_OUTPUT + 15));

		MidiCcWidget *midiWidget = Widget::create<MidiCcWidget>(mm2px(Vec(3.399621, 14.837339)));
		midiWidget->module = module;
		midiWidget->box.size = mm2px(Vec(44, 54.667));
		midiWidget->midiIO = &module->midiInput;
		midiWidget->createGridChoices();
		addChild(midiWidget);
	}
};


Model *modelMIDICCToCVInterface = Model::create<MIDICCToCVInterface, MIDICCToCVInterfaceWidget>("Core", "MIDICCToCVInterface", "MIDI-CC", MIDI_TAG, EXTERNAL_TAG);