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extends AudioStreamPlayer
# control wave form
export(String, "sine", "square", "triangle", "sawtooth", "white_noise", "brown_noise") var waveform = "sine"
# controllable frequency interface
export(float, 20, 8000, 5) var freq = 440.0
# toggle between playing a waveform or an instrument
export(bool) var play_instrument = false
# bending the waveform
export(bool) var apply_bend = false
export(Vector2) var phasor_bend = Vector2(0.5, 0.5)
# duration related
export(bool) var continuous = true
# Used for the total duration of an Instrument note
export(int, 0, 30000, 100) var duration = 3000
#Attack/Decay/Release/Sustain
export(int, 0, 5000, 100) var attack = 100
export(int, 0, 5000, 100) var decay = 100
export(int, 0, 5000, 100) var release = 100
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, 50.0, 0.1) var fm_multiplier = 1.0
export(float, 0.0, 1000.0, 1.0) var fm_index = 1.0
# 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 synth = MonoSynth.new()
# initialize the Godot stream we fill up with samples
var playback: AudioStreamPlayback = null
func _fill_buffer() -> void:
# get count of Frames (sample, sample) available in stream
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
# playback stream buffer
playback.push_buffer(synth.frames(to_fill))
func _check_waveform():
if waveform == "square":
synth.square()
elif waveform == "sine":
synth.sine()
elif waveform == "triangle":
synth.triangle()
elif waveform == "sawtooth":
synth.sawtooth()
elif waveform == "white_noise":
synth.white_noise()
elif waveform == "brown_noise":
synth.brown_noise()
func _process(_delta):
if self.is_playing():
synth.continuous(continuous)
synth.set_attack(attack)
synth.set_decay(decay)
synth.set_sustain(sustain)
synth.set_release(release)
synth.play_instrument(play_instrument)
_check_waveform()
_fill_buffer()
func _ready() -> void:
# buffer length of 10ms gives us ~realtime response to input changes
self.stream.buffer_length = 0.05
# ensure Godot/Sine have the same sample 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)
_check_waveform()
_fill_buffer()
func toggle_playback():
self._set_playing(!self.is_playing())
func _on_duration_value_changed(value):
synth.duration(int(value))
func _on_pitch_value_changed(value):
synth.frequency(value)
func _on_bell_click(event):
if event is InputEventMouseButton && event.is_pressed():
synth.trigger()
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