From ef7fcf7a878143627af178a23d75e0301a40d677 Mon Sep 17 00:00:00 2001
From: Grant Shangreaux <grant@unabridgedsoftware.com>
Date: Sun, 7 Nov 2021 00:37:27 -0500
Subject: Feature: frequency modulation MVP implemented :loud-sound:

---
 klangfarb/main.gd | 36 ++++++++++++++++++++++--------------
 1 file changed, 22 insertions(+), 14 deletions(-)

(limited to 'klangfarb/main.gd')

diff --git a/klangfarb/main.gd b/klangfarb/main.gd
index 95c0f8f..4397a7e 100644
--- a/klangfarb/main.gd
+++ b/klangfarb/main.gd
@@ -18,11 +18,16 @@ export(float, 0.0, 1.0, 0.1) var sustain = 0.5
 #Cutoff
 export(float, 20, 8000, 5) var cutoff = 6000
 
+# Frequency Modulation
+export(bool) var frequency_modulation = false
+export(float, 0.0, 100.0, 0.1) var fm_frequency = 1.0
+export(float, 0.0, 10.0, 0.1) var fm_amplitude = 0.1
+
 # load the GDNative script connected to the rust lib
 var MonoSynth = preload("res://MonoSynth.gdns")
 
 # make an instance of our one "class" in rust lib
-var wave = MonoSynth.new()
+var synth = MonoSynth.new()
 
 # initialize the Godot stream we fill up with samples
 var playback: AudioStreamPlayback = null
@@ -32,25 +37,28 @@ func _fill_buffer() -> void:
 	var to_fill = playback.get_frames_available()
 	if to_fill > 0:
 		# ask Rust to generate N frames at freq
-		# Array<Vector2> gets pushed to the 
+		# Array<Vector2> gets pushed to the
 		# playback stream buffer
-		playback.push_buffer(wave.frames(to_fill)) 
+		playback.push_buffer(synth.frames(to_fill))
 
 func _check_waveform():
 	if waveform == "square":
-		wave.square()
+		synth.square()
 	elif waveform == "sine":
-		wave.sine()
+		synth.sine()
 	elif waveform == "triangle":
-		wave.triangle()
+		synth.triangle()
 	elif waveform == "sawtooth":
-		wave.sawtooth()
+		synth.sawtooth()
 
 func _process(_delta):
 	if self.is_playing():
-		wave.apply_bend(apply_bend)		
-		wave.frequency(freq)
-		wave.phasor_bend(phasor_bend)
+		synth.apply_bend(apply_bend)
+		synth.frequency(freq) 
+		synth.phasor_bend(phasor_bend)
+		synth.frequency_modulation(frequency_modulation)
+		synth.fm_frequency(fm_frequency)
+		synth.fm_depth(fm_amplitude)
 		_check_waveform()
 		_fill_buffer()
 
@@ -58,7 +66,7 @@ func _ready() -> void:
 	# buffer length of 100ms gives us ~realtime response to input changes
 	self.stream.buffer_length = 0.1
 	# ensure Godot/Sine have the same sample rate
-	wave.set_sample_rate(self.stream.mix_rate)
+	synth.set_sample_rate(self.stream.mix_rate)
 	# get our AudioStreamPlayback object
 	playback = self.get_stream_playback()
 	# prefill the stream's sample buffer (which feeds DAC)
@@ -70,6 +78,6 @@ func _input(event):
 	if event is InputEventMouseButton:
 		print("Mouse Click/Unclick at: ", event.position)
 	elif event is InputEventMouseMotion:
-#		freq = event.position.x
-		phasor_bend.x = event.position.x / 1024
-		phasor_bend.y = event.position.y / 600
+		freq = event.position.x
+#		phasor_bend.x = event.position.x / 1024
+#		phasor_bend.y = event.position.y / 600
-- 
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