engine_glut.scd

(
Norns.spawn('glut') { |engine|
	var nvoices = 7;

	var pg;
	var effect;
	var buffers;
	var voices;
	var mixBus;
	var phases;
	var levels;

	var seek_tasks;

	// disk read
	var readBuf = { arg i, path;
		if(buffers[i].notNil, {
			if (File.exists(path), {
				// TODO: load stereo files and duplicate GrainBuf for stereo granulation
				var newbuf = Buffer.readChannel(s, path, 0, -1, [0], {
					voices[i].set(\buf, newbuf);
					buffers[i].free;
					buffers[i] = newbuf;
				});
			});
		});
	};

	buffers = Array.fill(nvoices, { arg i;
		Buffer.alloc(
			s,
			s.sampleRate * 1,
		);
	});

	~buffers = buffers; // TODO

	SynthDef(\synth, {
		arg out, phase_out, level_out, buf,
		gate=0, pos=0, speed=1, jitter=0,
		size=0.1, density=20, pitch=1, spread=0, gain=1, envscale=1,
		freeze=0, t_reset_pos=0;

		var grain_trig;
		var jitter_sig;
		var buf_dur;
		var pan_sig;
		var buf_pos;
		var pos_sig;
		var sig;

		var env;
		var level;

		grain_trig = Impulse.kr(density);
		buf_dur = BufDur.kr(buf);

		pan_sig = TRand.kr(trig: grain_trig,
			lo: spread.neg,
			hi: spread);

		jitter_sig = TRand.kr(trig: grain_trig,
			lo: buf_dur.reciprocal.neg * jitter,
			hi: buf_dur.reciprocal * jitter);

		buf_pos = Phasor.kr(trig: t_reset_pos,
			rate: buf_dur.reciprocal / ControlRate.ir * speed,
			resetPos: pos);

		pos_sig = Wrap.kr(Select.kr(freeze, [buf_pos, pos]));

		sig = GrainBuf.ar(2, grain_trig, size, buf, pitch, pos_sig + jitter_sig, 2, pan_sig);
		env = EnvGen.kr(Env.asr(1, 1, 1), gate: gate, timeScale: envscale);

		level = env;

		Out.ar(out, sig * level * gain);
		Out.kr(phase_out, pos_sig);
		// ignore gain for level out
		Out.kr(level_out, level);
	}).add;

	SynthDef(\effect, {
		arg in, out, mix=0.5, room=0.5, damp=0.5;
		var sig = In.ar(in, 2);
		sig = FreeVerb.ar(sig, mix, room, damp);
		Out.ar(out, sig);
	}).add;

	s.sync;

	// mix bus for all synth outputs
	mixBus =  Bus.audio(s, 2);

	effect = Synth.new(\effect, [\in, mixBus.index, \out, 0]);

	phases = Array.fill(nvoices, { arg i; Bus.control(engine.server); });
	levels = Array.fill(nvoices, { arg i; Bus.control(engine.server); });

	pg = ParGroup.before(effect);

	voices = Array.fill(nvoices, { arg i;
		Synth.new(\synth, [
			\out, mixBus.index,
			\phase_out, phases[i].index,
			\level_out, levels[i].index,
			\buf, buffers[i],
		], target: pg);
	});

	s.sync;

	engine.addCommand('reverb_mix', "f", { arg value; effect.set(\mix, value); });
	engine.addCommand('reverb_room', "f", { arg value; effect.set(\room, value); });
	engine.addCommand('reverb_damp', "f", { arg value; effect.set(\damp, value); });
	engine.addCommand('read', "is", { arg voice, path; [voice, path].debug; readBuf.value(voice - 1, path); });

	engine.addCommand('seek', "if", { arg argVoice, argPos;
		var voice = argVoice - 1;
		var lvl, pos;
		var seek_rate = 1 / 750;

		seek_tasks[voice].stop;

		// TODO: async get
		lvl = levels[voice].getSynchronous();

		if (false, { // disable seeking until fully implemented
			var step;
			var target_pos;

			// TODO: async get
			pos = phases[voice].getSynchronous();
			voices[voice].set(\freeze, 1);

			target_pos = argPos;
			step = (target_pos - pos) * seek_rate;

			seek_tasks[voice] = Routine {
				while({ abs(target_pos - pos) > abs(step) }, {
					pos = pos + step;
					voices[voice].set(\pos, pos);
					seek_rate.wait;
				});

				voices[voice].set(\pos, target_pos);
				voices[voice].set(\freeze, 0);
				voices[voice].set(\t_reset_pos, 1);
			};

			seek_tasks[voice].play();
		}, {
			pos = argPos;

			voices[voice].set(\pos, pos);
			voices[voice].set(\t_reset_pos, 1);
			voices[voice].set(\freeze, 0);
		});
	});

	engine.addCommand('gate', "ii", { arg argVoice, gate;
		var voice = argVoice - 1;
		voices[voice].set(\gate, gate);
	});

	engine.addCommand('speed', "if", { arg argVoice, speed;
		var voice = argVoice - 1;
		voices[voice].set(\speed, speed);
	});

	engine.addCommand('jitter', "if", { arg argVoice, jitter;
		var voice = argVoice - 1;
		voices[voice].set(\jitter, jitter);
	});

	engine.addCommand('size', "if", { arg argVoice, size;
		var voice = argVoice - 1;
		voices[voice].set(\size, size);
	});

	engine.addCommand('density', "if", { arg argVoice, density;
		var voice = argVoice - 1;
		voices[voice].set(\density, density);
	});

	engine.addCommand('pitch', "if", { arg argVoice, pitch;
		var voice = argVoice - 1;
		voices[voice].set(\pitch, pitch);
	});

	engine.addCommand('spread', "if", { arg argVoice, spread;
		var voice = argVoice - 1;
		voices[voice].set(\spread, spread);
	});

	engine.addCommand('volume', "if", { arg argVoice, volume;
		var voice = argVoice - 1;
		voices[voice].set(\volume, volume);
	});

	engine.addCommand('envscale', "if", { arg argVoice, envscale;
		var voice = argVoice - 1;
		voices[voice].set(\envscale, envscale);
	});

	nvoices.do({ arg i;

		engine.addPoll(
			('phase_' ++ (i+1)).asSymbol,
			{
				var val = phases[i].getSynchronous;
				val
			}// , false // TODO: should be periodic
		);

		engine.addPoll(
			('level_' ++ (i+1)).asSymbol,
			{
				var val = levels[i].getSynchronous;
				val
			}
		);

	});

	seek_tasks = Array.fill(nvoices, { arg i;
		Routine {}
	});

	engine.onFree = {
		voices.do({ arg voice; voice.free; });
		phases.do({ arg bus; bus.free; });
		levels.do({ arg bus; bus.free; });
		buffers.do({ arg b; b.free; });
		effect.free;
		mixBus.free;
		pg.free;
	};
}
)