Rack/plugins/community/repos/Southpole/src/Wriggle.cpp

#include <iostream>

#include "Southpole.hpp"

#include "dsp/digital.hpp"

namespace rack_plugin_Southpole {

struct Wriggle : Module {
	enum ParamIds {
		DAMP_PARAM,
		TENS_PARAM,
		SCALE_PARAM,
		OFFSET_PARAM,
		NUM_PARAMS
	};
	enum InputIds {
		IN_INPUT,
		DAMP_INPUT,
		TENS_INPUT,
		SCALE_INPUT,
		OFFSET_INPUT,
		NUM_INPUTS
	};
	enum OutputIds {
		OUT_OUTPUT,
		NUM_OUTPUTS
	};
	enum LightIds {
//		DECAY1_LIGHT,
		NUM_LIGHTS
	};

	float a0 = 0.0;
	float v0 = 0.0;
	float x0 = 0.0;

	Wriggle() : Module(NUM_PARAMS, NUM_INPUTS, NUM_OUTPUTS, NUM_LIGHTS) {
	}

	void step() override;
};



void Wriggle::step() {

	float dt = 1./engineGetSampleRate();

	float tens 	 = clamp(params[TENS_PARAM].value + inputs[TENS_INPUT].normalize(0.) / 10.0, 0.0f, 1.0f);
	float damp 	 = clamp(params[DAMP_PARAM].value + inputs[DAMP_INPUT].normalize(0.) / 10.0, 0.0f, 1.0f);
	float scale	 = clamp(params[SCALE_PARAM].value + inputs[SCALE_INPUT].normalize(0.) / 10.0, 0.0f, 1.0f);
	float offset = clamp(params[OFFSET_PARAM].value + inputs[OFFSET_INPUT].normalize(0.) / 10.0, 0.0f, 1.0f);

	// semi-parametric Euler... (i know ...)

	//float m  = 1000.*pow(2., 6.*mass);
	float k   = pow(2.,18.*tens);
	float b   = pow(2.,10.*damp-3.);
	float xin = inputs[IN_INPUT].value; 

	v0 = v0 + dt*a0; // - v0 / m;
	x0 = x0 + dt*v0; 
	a0 = - k * (x0-xin) - b * v0; //) / m;

	outputs[OUT_OUTPUT].value = clamp( (10. * offset - 5.) + scale * x0, -10.0f, 10.0f );
}

struct WriggleWidget : ModuleWidget { 
	
	WriggleWidget(Wriggle *module) : ModuleWidget(module) {

		box.size = Vec(15*2, 380);

		{
			SVGPanel *panel = new SVGPanel();
			panel->box.size = box.size;
			panel->setBackground(SVG::load(assetPlugin(plugin, "res/Wriggle.svg")));
			addChild(panel);
		}

		const float x1 = 5.;
		const float y1 = 40.;
		const float yh = 31.;
		
		addInput(Port::create<sp_Port		  >(Vec(x1, y1+0*yh), Port::INPUT, module, Wriggle::IN_INPUT));
		addInput(Port::create<sp_Port		  >(Vec(x1, y1+1.125*yh), Port::INPUT, module, Wriggle::TENS_INPUT));
		addParam(ParamWidget::create<sp_SmallBlackKnob>(Vec(x1, y1+2*yh), module, Wriggle::TENS_PARAM, 0.0, 1.0, 0.5));
		addInput(Port::create<sp_Port		  >(Vec(x1, y1+3.125*yh), Port::INPUT, module, Wriggle::DAMP_INPUT));
		addParam(ParamWidget::create<sp_SmallBlackKnob>(Vec(x1, y1+4*yh), module, Wriggle::DAMP_PARAM, 0.0, 1.0, 0.5));
		addInput(Port::create<sp_Port		  >(Vec(x1, y1+5.125*yh), Port::INPUT, module, Wriggle::SCALE_INPUT));
		addParam(ParamWidget::create<sp_SmallBlackKnob>(Vec(x1, y1+6*yh), module, Wriggle::SCALE_PARAM, 0.0, 1.0, 0.5));
		addInput(Port::create<sp_Port  		  >(Vec(x1, y1+7.125*yh), Port::INPUT, module, Wriggle::OFFSET_INPUT));
		addParam(ParamWidget::create<sp_SmallBlackKnob>(Vec(x1, y1+8*yh), module, Wriggle::OFFSET_PARAM, 0.0, 1.0, 0.5));
		addOutput(Port::create<sp_Port		  >(Vec(x1, y1+9.25*yh), Port::OUTPUT, module, Wriggle::OUT_OUTPUT));

	//	addChild(ModuleLightWidget::create<SmallLight<RedLight>>(Vec(94, 109), module, Wriggle::DECAY_LIGHT));
	}
};

} // namespace rack_plugin_Southpole

using namespace rack_plugin_Southpole;

RACK_PLUGIN_MODEL_INIT(Southpole, Wriggle) {
   Model *modelWriggle = Model::create<Wriggle,WriggleWidget>(	 "Southpole", "Wriggle", 	"Wriggle - spring model", LFO_TAG, FUNCTION_GENERATOR_TAG);
   return modelWriggle;
}