504 lines
21 KiB
GDScript
504 lines
21 KiB
GDScript
#warning-ignore-all:shadowed_variable
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extends Node
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const music := preload('res://scripts/loaders/snes/music_ff5.gd')
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const EventType := music.EventType
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var MUSIC := music.new()
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const NUM_TRACKS := 8 # TODO
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const MAX_NOTE_EVENTS := 4096
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class NoteEvent:
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var p_event_start: int # In pulse space
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var p_note_start: int # For tied notes, this will be earlier than p_event_start and is used for envelope calculations
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var p_end: int
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var instrument: int
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var pitch: int = 0
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var velocity: float = 0.0
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var adsr_attack_rate: int
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var adsr_decay_rate: int
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var adsr_decay_total_periods: int
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var adsr_sustain_rate: int
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class TrackCurve: # built-in Curve class is too restrictive for this
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var default: float
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var entries: PoolVector3Array
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var baked_integrals: PoolRealArray
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func _init(default: float = 0.0):
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self.default = default
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self.entries = PoolVector3Array()
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self.baked_integrals = PoolRealArray()
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func add_point(pulse: int, value: float, ramp_to_next: bool = false) -> void:
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var l := len(self.entries)
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var entry := Vector3(float(pulse), value, float(ramp_to_next))
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if l == 0 or self.entries[-1].x < pulse:
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self.entries.append(entry)
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else: # Find the first entry bigger than pulse, and insert before
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for i in l:
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if self.entries[i].x == pulse:
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self.entries[i] = entry # Replace existing, this makes sense for the VOLUME -> VOLUME_SLIDE pattern
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elif self.entries[i].x > pulse:
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self.entries.insert(i, entry)
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break
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var last_pulse_block_get: int = -1 # Cache previous position for sequential lookups
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func get_pulse(pulse: float) -> float:
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var l := len(self.entries)
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if l == 0 or pulse < self.entries[0].x:
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return self.default
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if pulse >= self.entries[-1].x:
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return self.entries[-1].y
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for i in l-2:
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# Find first entry beyond
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if pulse < self.entries[i+1].x:
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if self.entries[i].z > 0: # ramp_to_next
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return range_lerp(pulse, self.entries[i].x, self.entries[i+1].x, self.entries[i].y, self.entries[i+1].y)
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else:
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return self.entries[i].y
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return self.default # Should be unreachable
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func bake_integrals():
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# Store the starting integrated value (i.e. time for the tempo curve) of each pulse value
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self.baked_integrals.clear()
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var last_pulse := 0.0
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var last_value := self.default
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var last_integral := 0.0
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var last_ramp := false
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for entry in self.entries:
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var step_pulse = entry.x - last_pulse
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var integral := last_integral
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if last_ramp:
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# Treat it as a rectangle where the height is the average of the slanted top.
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integral += step_pulse * (last_value + entry.y)/2.0
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else:
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integral += step_pulse * last_value
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self.baked_integrals.append(integral)
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last_pulse = entry.x
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last_value = entry.y
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last_integral = integral
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last_ramp = entry.z > 0
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var last_integral_block_get: int = -1 # Cache previous position for sequential lookups
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func get_integral(pulse: float) -> float:
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# This is for tempo -> time. Need to bake it to have any hope of efficiency.
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if self.baked_integrals.empty():
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self.bake_integrals()
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# Find first entry earlier than the pulse
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for i in range(len(self.entries)-1, -1, -1):
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var entry = self.entries[i]
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if pulse > entry.x:
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var integral = self.baked_integrals[i]
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var step_pulse = pulse - entry.x
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if entry.z: # Ramp to next
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# Treat it as a rectangle where the height is the average of the slanted top.
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integral += step_pulse * (entry.y + entries[i+1].y)/2.0 # If last entry somehow has ramp-to-next (it shouldn't), this will out-of-range error
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else:
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integral += step_pulse * entry.y
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return integral
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return 0.0
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static func get_gcd(a: int, b: int) -> int: # Greatest Common Divisor of two numbers
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# Euclidian reduction
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var c
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while b:
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c = b
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b = a % b
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a = c
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return a
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static func get_lcm(a: int, b: int) -> int: # Least Common Multiple of two numbers
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return (a * b) / get_gcd(a, b)
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static func get_lcm_n(values: Array) -> int: # Least Common Multiple of an array of numbers
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var lcm: int = values.pop_back()
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for value in values:
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lcm = get_lcm(lcm, value)
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return lcm
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const LOOP_OVERSHOOT := 768
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static func render_channels(tracks: Array, inst_map: Array, _debug_name := 'none') -> Array: # [data: PoolByteArray, target_time_length: float in seconds]
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# Since some channels contain global events (tempo and global volume for now),
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# the strategy will be to preprocess each channel in a global-state-agnostic way,
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# then once all the global tracks are known, as well as the longest unlooped length,
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# do a second pass to generate the final events
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# self.print_channel_events(inst_map)
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var all_adsr_decay_total_periods: PoolIntArray = SoundLoader.all_adsr_decay_total_periods
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var sample_default_adsrs = RomLoader.snes_data.sfx_adsrs + RomLoader.snes_data.bgm_instrument_adsrs # TODO: UNHARDCODE THIS
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var all_note_events = []
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var curve_master_volume := TrackCurve.new(1.0) # [0.0, 1.0] for now
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var curve_master_tempo := TrackCurve.new(120.0) # bpm is too big, need pulses per second
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var curve_channel_pans := []
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for channel in NUM_TRACKS:
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var curve_velocity := TrackCurve.new(1.0) # [0.0, 1.0] for now
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var curve_pan := TrackCurve.new() # [-1.0, 1.0] for now
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# Stored and unused for now
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var curve_fine_tuning := TrackCurve.new() # [0.0, 1.0] for now
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var curve_vibrato_on := TrackCurve.new() # [0.0, 1.0] for now
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var curve_vibrato_delay := TrackCurve.new()
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var curve_vibrato_rate := TrackCurve.new()
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var curve_vibrato_depth := TrackCurve.new()
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var curve_tremolo_on := TrackCurve.new() # [0.0, 1.0] for now
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var curve_tremolo_delay := TrackCurve.new()
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var curve_tremolo_rate := TrackCurve.new()
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var curve_tremolo_depth := TrackCurve.new()
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var curve_pan_lfo_on := TrackCurve.new() # [0.0, 1.0] for now
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var curve_pan_lfo_rate := TrackCurve.new()
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var curve_pan_lfo_depth := TrackCurve.new()
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var curve_noise_on := TrackCurve.new() # [0.0, 1.0] for now
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var curve_noise_freq := TrackCurve.new()
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var curve_pitchmod_on := TrackCurve.new() # [0.0, 1.0] for now
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var curve_echo_on := TrackCurve.new() # [0.0, 1.0] for now
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var curve_echo_volume := TrackCurve.new()
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var channel_note_events = []
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var track: Array = tracks[channel]
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var l := len(track)
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var p := 0 # current pulse
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if l == 0: # Empty channel, move on
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all_note_events.append(channel_note_events)
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curve_channel_pans.append(curve_pan)
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continue
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# var num_notes: int = 0
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var current_instrument := 0
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var current_octave := 5
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var current_transpose := 0
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# var current_velocity := 255
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var current_adsr_attack_rate := 0
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var current_adsr_decay_rate := 0
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var current_adsr_decay_total_periods := 0
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var current_adsr_sustain_rate := 0
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# First, check if it ends in a GOTO, then store the program counter of the destination
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var infinite_loop_target_program_counter = -1
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var infinite_loop_target_pulse = -1
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if track[-1][0] == EventType.GOTO:
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infinite_loop_target_program_counter = track[-1][1]
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var program_counter := 0
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var last_note_pretransform_pitch := -2
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var last_untied_note_p_start := 0
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while true: #num_notes < MAX_NOTE_EVENTS:
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if program_counter >= l:
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break
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if program_counter == infinite_loop_target_program_counter:
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infinite_loop_target_pulse = p
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var event = track[program_counter]
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program_counter += 1
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match event[0]: # Control codes
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EventType.GOTO: # This is a preprocessed event list, so GOTO is a final infinite loop marker
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var note_event = NoteEvent.new()
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note_event.p_event_start = p
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note_event.p_end = infinite_loop_target_pulse # Fake final note event using p_event_start > p_end to encode the infinite jump back loop.
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# Note that event[1] points to an Event, not a NoteEvent, not a Pulse, so we looked it up earlier
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channel_note_events.append(note_event)
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break
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EventType.MASTER_VOLUME:
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curve_master_volume.add_point(p, event[1]/255.0, false)
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EventType.TEMPO:
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var new_tempo = music.tempo_to_seconds_per_pulse(event[1])
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curve_master_tempo.add_point(p, new_tempo, false)
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EventType.TEMPO_SLIDE:
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var old_tempo = curve_master_tempo.get_pulse(p)
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var new_tempo = music.tempo_to_seconds_per_pulse(event[2])
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var slide_duration: int = event[1] # TODO: work out how this is scaled
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curve_master_tempo.add_point(p, old_tempo, true)
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curve_master_tempo.add_point(p + slide_duration, new_tempo, false)
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EventType.NOTE:
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var note = event[1]
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var duration = event[2]
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var note_event = NoteEvent.new()
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note_event.p_event_start = p
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note_event.p_note_start = p
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note_event.p_end = p + duration
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note_event.instrument = current_instrument
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note_event.adsr_attack_rate = current_adsr_attack_rate
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note_event.adsr_decay_rate = current_adsr_decay_rate
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note_event.adsr_decay_total_periods = current_adsr_decay_total_periods
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note_event.adsr_sustain_rate = current_adsr_sustain_rate
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if note >= 0: # Don't shift or play rests
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last_note_pretransform_pitch = note # Ties reuse this
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last_untied_note_p_start = p
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note += (12 * current_octave) + current_transpose
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note_event.pitch = note # pitch_idx #* curve_fine_tuning
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note_event.velocity = curve_velocity.get_pulse(p) # current_velocity
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elif note == music.NOTE_IS_TIE:
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if last_note_pretransform_pitch >= 0:
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note = last_note_pretransform_pitch + (12 * current_octave) + current_transpose
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note_event.p_note_start = last_untied_note_p_start
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note_event.pitch = note # pitch_idx #* curve_fine_tuning
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note_event.velocity = curve_velocity.get_pulse(p) # current_velocity
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channel_note_events.append(note_event)
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p += duration
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EventType.VOLUME:
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var new_velocity: float = event[1]/255.0
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curve_velocity.add_point(p, new_velocity, false)
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EventType.VOLUME_SLIDE: # TODO: implement slides
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var old_velocity = curve_velocity.get_pulse(p)
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var slide_duration: int = event[1]
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var new_velocity: float = event[2]/255.0
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curve_velocity.add_point(p, old_velocity, true)
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curve_velocity.add_point(p + slide_duration, new_velocity, false)
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EventType.PAN:
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var new_pan = 1.0 - event[1]/127.5
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curve_pan.add_point(p, new_pan, false)
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EventType.PAN_SLIDE: # TODO: implement slides
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var old_pan = curve_pan.get_pulse(p)
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var new_pan = 1.0 - event[2]/127.5
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var slide_duration: int = event[1] # TODO: work out how slides are scaled
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curve_pan.add_point(p, old_pan, true)
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curve_pan.add_point(p + slide_duration, new_pan, false)
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EventType.PITCH_SLIDE: # TODO: implement slides
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var slide_duration: int = event[1]
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var target_pitch: int = event[2] # Signed
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EventType.OCTAVE:
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current_octave = event[1]
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EventType.OCTAVE_UP:
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current_octave += 1
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EventType.OCTAVE_DOWN:
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current_octave -= 1
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EventType.TRANSPOSE_ABS:
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current_transpose = event[1]
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EventType.TRANSPOSE_REL:
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current_transpose += event[1]
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EventType.TUNING:
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var fine_tune: int = event[1]
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var scale: float
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if fine_tune < 0x80:
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scale = 1.0 + fine_tune/255.0
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else:
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scale = fine_tune/255.0
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curve_fine_tuning.add_point(p, scale)
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EventType.PROGCHANGE:
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current_instrument = event[1]
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if current_instrument >= 0x20:
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current_instrument = inst_map[current_instrument-0x20] - 1 + SoundLoader.SFX_NUM
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if current_instrument < len(sample_default_adsrs) and current_instrument > 0:
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var adsr = sample_default_adsrs[current_instrument]
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current_adsr_attack_rate = adsr.attack_rate
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current_adsr_decay_rate = adsr.decay_rate
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current_adsr_sustain_rate = adsr.sustain_rate
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current_adsr_decay_total_periods = all_adsr_decay_total_periods[adsr.sustain_level]
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EventType.ADSR_DEFAULT: # TODO - Investigate actual scaling and order
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if current_instrument < len(sample_default_adsrs) and current_instrument > 0:
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var adsr = sample_default_adsrs[current_instrument]
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current_adsr_attack_rate = adsr.attack_rate
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current_adsr_decay_rate = adsr.decay_rate
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current_adsr_sustain_rate = adsr.sustain_rate
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current_adsr_decay_total_periods = all_adsr_decay_total_periods[adsr.sustain_level]
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EventType.ADSR_ATTACK_RATE:
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current_adsr_attack_rate = event[1]
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EventType.ADSR_DECAY_RATE:
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current_adsr_decay_rate = event[1]
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EventType.ADSR_SUSTAIN_LEVEL:
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current_adsr_decay_total_periods = all_adsr_decay_total_periods[event[1]]
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EventType.ADSR_SUSTAIN_RATE:
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current_adsr_sustain_rate = event[1]
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EventType.VIBRATO_ON:
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curve_vibrato_delay.add_point(p, event[1])
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curve_vibrato_rate.add_point(p, event[2])
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curve_vibrato_depth.add_point(p, event[3])
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curve_vibrato_on.add_point(p, 1)
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EventType.VIBRATO_OFF:
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curve_vibrato_on.add_point(p, 0)
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EventType.TREMOLO_ON:
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curve_tremolo_delay.add_point(p, event[1])
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curve_tremolo_rate.add_point(p, event[2])
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curve_tremolo_depth.add_point(p, event[3])
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curve_tremolo_on.add_point(p, 1)
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EventType.TREMOLO_OFF:
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curve_tremolo_on.add_point(p, 0)
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EventType.PAN_LFO_ON:
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curve_pan_lfo_depth.add_point(p, event[1])
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curve_pan_lfo_rate.add_point(p, event[2])
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curve_pan_lfo_on.add_point(p, 1)
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EventType.PAN_LFO_OFF:
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curve_pan_lfo_on.add_point(p, 0)
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EventType.NOISE_FREQ:
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curve_noise_freq.add_point(p, event[1])
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EventType.NOISE_ON:
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curve_noise_on.add_point(p, 1)
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EventType.NOISE_OFF:
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curve_noise_on.add_point(p, 0)
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EventType.PITCHMOD_ON:
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curve_pitchmod_on.add_point(p, 1)
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EventType.PITCHMOD_OFF:
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curve_pitchmod_on.add_point(p, 0)
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EventType.ECHO_ON:
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curve_echo_on.add_point(p, 1)
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EventType.ECHO_OFF:
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curve_echo_on.add_point(p, 0)
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EventType.ECHO_VOLUME:
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curve_echo_volume.add_point(p, event[1])
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EventType.ECHO_VOLUME_SLIDE:
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var slide_duration: int = event[1] # TODO: work out how slides are scaled
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var old_echo_volume = curve_echo_volume.get_pulse(p)
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var new_echo_volume = event[2]
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curve_echo_volume.add_point(p, old_echo_volume, true)
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curve_echo_volume.add_point(p + slide_duration, new_echo_volume)
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EventType.ECHO_FEEDBACK_FIR: # TODO
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var feedback: int = event[1]
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var filterIndex: int = event[2]
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EventType.END:
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break
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_:
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break
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# End of track
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if len(channel_note_events) > (MAX_NOTE_EVENTS-2):
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print('%s channel %d has too many note events! %d is more than %d' % [_debug_name, channel, len(channel_note_events), MAX_NOTE_EVENTS-2])
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all_note_events.append(channel_note_events)
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curve_channel_pans.append(curve_pan)
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# Integrate tempo so we can get a pulse->time mapping
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curve_master_tempo.bake_integrals()
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# Find the longest channel
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var channel_loop_p_returns := PoolIntArray()
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var channel_loop_p_lengths := PoolIntArray()
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var channel_p_ends := PoolIntArray()
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var longest_channel_idx = 0
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var longest_channel_p_end = 0
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var highest_channel_p_return = -1
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for channel in NUM_TRACKS:
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if all_note_events[channel].empty():
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channel_loop_p_returns.append(-1)
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channel_loop_p_lengths.append(0)
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channel_p_ends.append(0)
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continue
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var note_event: NoteEvent = all_note_events[channel][-1]
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var p_end = note_event.p_end
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if p_end < note_event.p_event_start:
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# Ends on infinite loop
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channel_loop_p_returns.append(p_end)
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channel_loop_p_lengths.append(note_event.p_event_start - p_end)
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if p_end > highest_channel_p_return:
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highest_channel_p_return = p_end
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p_end = note_event.p_event_start
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else:
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channel_loop_p_returns.append(-1)
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channel_loop_p_lengths.append(0)
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channel_p_ends.append(p_end)
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if p_end > longest_channel_p_end:
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longest_channel_p_end = p_end
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longest_channel_idx = channel
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var target_pulse_length = longest_channel_p_end + LOOP_OVERSHOOT
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var target_time_length = curve_master_tempo.get_integral(target_pulse_length)
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# # DEBUG: calculate LCM of the loop lengths to determine required length for a true loop point
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# var unique_loop_lengths := []
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# # TODO: find common loop pulses
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# for loop_length in channel_loop_p_lengths:
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# if loop_length > 0 and not (loop_length in unique_loop_lengths):
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# unique_loop_lengths.append(loop_length)
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# if unique_loop_lengths:
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# var loop_length_lcm = get_lcm_n(unique_loop_lengths)
|
|
# var p_overall_loop_start = highest_channel_p_return #+ LOOP_OVERSHOOT
|
|
# var p_overall_loop_end = p_overall_loop_start + loop_length_lcm
|
|
# print('%s has lcm loop length %d pulses from loop lengths %s, from %d to %d.' % [_debug_name, loop_length_lcm, channel_loop_p_lengths, p_overall_loop_start, p_overall_loop_end])
|
|
# else:
|
|
# print('%s does not loop' % _debug_name)
|
|
|
|
# Second pass - encode the notes with the now-known global tempo and volume curves
|
|
var data := PoolByteArray()
|
|
for channel in NUM_TRACKS:
|
|
var events = all_note_events[channel]
|
|
var loop_return_note_event_idx = -1
|
|
var loop_return_p = channel_loop_p_returns[channel]
|
|
var curve_pan: TrackCurve = curve_channel_pans[channel]
|
|
|
|
var midi_events_bytes_t_event_start := StreamPeerBuffer.new()
|
|
var midi_events_bytes_t_note_start := StreamPeerBuffer.new()
|
|
# var midi_events_bytes_t_end := StreamPeerBuffer.new()
|
|
var midi_events_bytes2 := StreamPeerBuffer.new()
|
|
var midi_events_bytes_adsr := StreamPeerBuffer.new()
|
|
var midi_events_bytes_adsr2 := StreamPeerBuffer.new()
|
|
|
|
var num_notes: int = 0
|
|
var event_ptr := 0
|
|
var l_events := len(events)
|
|
var loop_p_offset := 0
|
|
for i in MAX_NOTE_EVENTS:
|
|
if event_ptr >= l_events:
|
|
break
|
|
if (loop_return_p >= 0) and event_ptr == l_events-1:
|
|
event_ptr = loop_return_note_event_idx
|
|
loop_p_offset += channel_loop_p_lengths[channel]
|
|
var event: NoteEvent = events[event_ptr]
|
|
var p = event.p_event_start
|
|
if loop_return_note_event_idx < 0 and p >= loop_return_p:
|
|
loop_return_note_event_idx = event_ptr
|
|
midi_events_bytes_t_event_start.put_32(int(curve_master_tempo.get_integral(p + loop_p_offset) * 32000))
|
|
midi_events_bytes_t_note_start.put_32(int(curve_master_tempo.get_integral(event.p_note_start + loop_p_offset) * 32000))
|
|
# midi_events_bytes_t_end.put_32(int(curve_master_tempo.get_integral(event.p_end + loop_p_offset) * 32000)) # t_end
|
|
midi_events_bytes2.put_u8(event.instrument)
|
|
midi_events_bytes2.put_u8(event.pitch)
|
|
midi_events_bytes2.put_u8(int(event.velocity * curve_master_volume.get_pulse(p) * 255.0)) # velocity
|
|
midi_events_bytes2.put_u8(int((curve_pan.get_pulse(p)+1.0) * 127.5)) # pan
|
|
midi_events_bytes_adsr.put_u8(event.adsr_attack_rate)
|
|
midi_events_bytes_adsr.put_u8(event.adsr_decay_rate)
|
|
midi_events_bytes_adsr.put_u8(event.adsr_decay_total_periods)
|
|
midi_events_bytes_adsr.put_u8(event.adsr_sustain_rate)
|
|
midi_events_bytes_adsr2.put_32(0)
|
|
|
|
event_ptr += 1
|
|
num_notes += 1
|
|
# Fill up end of notes array with dummies
|
|
var last_note_end: int = 0
|
|
if events:
|
|
last_note_end = int(curve_master_tempo.get_integral(events[-1].p_end + loop_p_offset) * 32000)
|
|
for i in range(num_notes, MAX_NOTE_EVENTS):
|
|
midi_events_bytes_t_event_start.put_32(last_note_end)
|
|
midi_events_bytes_t_note_start.put_32(last_note_end)
|
|
# midi_events_bytes_t_end.put_32(0x0FFFFFFF)
|
|
midi_events_bytes2.put_32(0)
|
|
midi_events_bytes_adsr.put_32(0)
|
|
midi_events_bytes_adsr2.put_32(0)
|
|
# data += midi_events_bytes_t_event_start.data_array + midi_events_bytes_t_end.data_array + midi_events_bytes2.data_array + midi_events_bytes_adsr.data_array + midi_events_bytes_t_note_start.data_array
|
|
data += midi_events_bytes_t_event_start.data_array + midi_events_bytes_t_note_start.data_array + midi_events_bytes2.data_array + midi_events_bytes_adsr.data_array + midi_events_bytes_adsr2.data_array
|
|
var t_loop_endpoints := Vector2(-1, -1)
|
|
if highest_channel_p_return >= 0:
|
|
t_loop_endpoints = Vector2(curve_master_tempo.get_integral(highest_channel_p_return + 100), curve_master_tempo.get_integral(longest_channel_p_end + 100))
|
|
return [data, target_time_length, t_loop_endpoints]
|
|
|
|
|
|
static func disassemble_channel_events(channel_events: Array, inst_map: Array) -> PoolStringArray:
|
|
var output := PoolStringArray()
|
|
var p := 0 # current pulse
|
|
for event in channel_events:
|
|
var print_str := 'p=%6d : %s '%[p, EventType.keys()[event[0]]]
|
|
var print_str2 := str(event.slice(1, -1))
|
|
match event[0]:
|
|
EventType.NOTE:
|
|
var note = event[1]
|
|
var duration = event[2]
|
|
match note:
|
|
music.NOTE_IS_REST:
|
|
output.append('p=%6d : NOTE_REST %d pulses'%[p, duration])
|
|
music.NOTE_IS_TIE:
|
|
output.append('p=%6d : NOTE_TIE %d pulses'%[p, duration])
|
|
_:
|
|
output.append(print_str + print_str2)
|
|
p += duration
|
|
EventType.PROGCHANGE:
|
|
var event_idx = event[1]
|
|
if event_idx >= 0x20:
|
|
output.append(print_str + '($%02x) = instrument %02d'%[event_idx, inst_map[event_idx-0x20] - 1])
|
|
else:
|
|
output.append(print_str + 'sfx %d'%event_idx)
|
|
_:
|
|
output.append(print_str + print_str2)
|
|
return output
|
|
|
|
static func disassemble_bgm(tracks: Array, inst_map: Array) -> PoolStringArray:
|
|
var output := PoolStringArray()
|
|
var channel := 0
|
|
for channel_events in tracks:
|
|
output.append('================Channel %d================'%channel)
|
|
channel += 1
|
|
output.append_array(disassemble_channel_events(channel_events, inst_map))
|
|
return output
|