#include <signal/signal.h>
using namespace libsignal;

AudioGraphRef graph = new AudioGraph();

/*------------------------------------------------------------------------
 * A SynthTemplate constructs a reusable synthesis graph.
 * -Ref objects are std::shared_ptr smart pointers,
 * so no memory management required.
 *-----------------------------------------------------------------------*/
SynthTemplateRef tmp = new SynthTemplate("ping");

/*------------------------------------------------------------------------
 * Initializing Sine with an array of frequencies creates a stereo output.
 *-----------------------------------------------------------------------*/
NodeRef sine = tmp->add_node(new Sine({ 440, 880 }));

/*------------------------------------------------------------------------
 * Simple attack/sustain/release envelope with linear curves.
 *-----------------------------------------------------------------------*/
NodeRef env = tmp->add_node(new ASR(0.01, 0.1, 0.5));

/*------------------------------------------------------------------------
 * Operator overloading: Apply the envelope to the sine wave's amplitude
 *-----------------------------------------------------------------------*/
NodeRef ping = tmp->add_node(sine * env);

/*------------------------------------------------------------------------
 * Single-tap delay line with feedback.
 *-----------------------------------------------------------------------*/
NodeRef delay = tmp->add_node(new Delay(ping, 0.5, 0.5));
tmp->set_output(delay);

/*------------------------------------------------------------------------
 * Instantiate the synth and route it to the audio output.
 *-----------------------------------------------------------------------*/
SynthRef synth = new Synth(tmp);
graph->add_output(synth);
graph->start();