20201230B-polyphony.rb

##| polyphony
##| v0.4
##| by d0lfyn (twitter: @0delphini)
##|
##| a simple generator for polyphony in 4 parts
##|
##| history:
##| v0.3
##| + add patterns
##| v0.4
##| + add turn-waiting
##| + add quits
##| + add pattern generation
##| + add patterns bank
##| + add pattern switching

use_bpm 600
use_synth :fm
use_random_seed 6

set :base_note, 0
set :note_1, 0
set :note_2, 0
set :note_3, 0

##| for manual patterns, specify notes in 0-indexed position on scale
set :patterns, []
set :pattern, []
set :pattern_length_min, 4
set :pattern_length_max, 16
set :pattern_generation_factor, 50
set :pattern_repetition_factor, 4
set :pattern_switch_factor, 25
set :pattern_play_delay, 20

set :PATTERN_NOTE_VALUE, 0
set :PATTERN_NOTE_DURATION, 1

set :scale, scale(:c3, :minor)

set :quit_factor, 20
set :quit_time_min, 50
set :quit_time_max, 80
set :turn, 1

define :base do
  generate_pattern
  play_the_pattern :base_note, 0
  loop do
    sync :time
    if get[:base_note] % 8 == get[:pattern][0][get[:PATTERN_NOTE_VALUE]] % 8 &&
        one_in(get[:pattern_repetition_factor])
      play_the_pattern :base_note, 0
    else
      duration = choose_next_duration
      play_now get[:base_note], 0, choose_next_amp, duration - 0.01
      set :base_note, get[:base_note] + choose_next_interval
      sleep duration - 0.01
    end
    if is_root(get[:base_note]) && one_in(get[:quit_factor])
      break
    end
  end
end

define :contra do |transposition, time_state_note|
  while(!(is_above_or_equal get[:base_note], get[time_state_note]) ||
        !(is_harmonious get[:base_note], get[time_state_note]))
    sync :time
    sleep 0.99
  end
  play_the_pattern time_state_note, transposition
  loop do
    sync :time
    if get[time_state_note] % 8 == get[:pattern][0][get[:PATTERN_NOTE_VALUE]] % 8 &&
        one_in(get[:pattern_repetition_factor])
      play_the_pattern time_state_note, transposition
    else
      duration = choose_next_duration
      play_now get[time_state_note], transposition, choose_next_amp, duration - 0.01
      interval = choose_next_interval
      while(!(is_above_or_equal get[:base_note], get[time_state_note] + interval) ||
            !(is_harmonious get[:base_note], get[time_state_note] + interval))
        interval = choose_next_interval
      end
      set time_state_note, get[time_state_note] + choose_next_interval
      sleep duration - 0.01
    end
    if is_root(get[time_state_note]) && one_in(get[:quit_factor])
      break
    end
  end
end

define :choose_next_amp do
  ##| return look % 4 == 0 ? 0.2 : 0.1
  return 0.1
end

define :choose_next_duration do
  return rrand_i(1, 5)
end

define :choose_next_interval do
  return choose([dice(2) - 1, dice(3) - 1, dice(4) - 1,
                 dice(5) - 1, dice(6) - 1, dice(7) - 1,
                 -1 * (dice(2) - 1), -1 * (dice(3) - 1), -1 * (dice(4) - 1),
                 -1 * (dice(5) - 1),  -1 * (dice(6) - 1), -1 * (dice(7) - 1)])
end

define :generate_pattern do
  pattern = []
  length = rrand_i(get[:pattern_length_min], get[:pattern_length_max])
  next_note = rand_i(8)
  while length >= 0
    next_note += choose_next_interval
    pattern.push [next_note, choose_next_duration]
    length -= 1
  end
  set :patterns, get[:patterns].take(get[:patterns].length).push(pattern)
  set :pattern, pattern
end

define :is_above_or_equal do |note_1, note_2|
  difference = note_2 % 8 - note_1 % 8
  return difference >= 0
end

define :is_harmonious do |note_1, note_2|
  difference = note_2 % 8 - note_1 % 8
  return difference == 0 || difference == 2 || difference == 4 || difference == 5
end

define :is_root do |note_number|
  return note_number % 8 == 0
end

define :play_beat do
  sync :time
  sample :drum_bass_soft, amp: 0.3, sustain: 0, release: 4
  sleep 4
  sample :drum_bass_soft, amp: 0.2, sustain: 0, release: 4
  sleep 4
  sample :drum_bass_soft, amp: 0.3, sustain: 0, release: 4
  sleep 4
  sample :drum_bass_soft, amp: 0.2, sustain: 0, release: 4
  sleep 3.99
  loop do
    sync :time
    sample :drum_bass_soft, amp: 0.3, sustain: 0, release: 4
    sample :drum_cymbal_closed, amp: 0.1, sustain: 0, release: 2
    sleep 2
    sample :drum_cymbal_closed, amp: 0.05, sustain: 0, release: 2
    sleep 2
    sample :drum_bass_soft, amp: 0.2, sustain: 0, release: 4
    sample :drum_snare_soft, amp: 0.3, sustain: 0, release: 4
    sample :drum_cymbal_closed, amp: 0.1, sustain: 0, release: 2
    sleep 2
    sample :drum_cymbal_closed, amp: 0.05, sustain: 0, release: 2
    sleep 1.99
  end
end

define :play_now do |next_note, transposition, amplitude, duration|
  play get[:scale][next_note] + transposition * 12, amp: amplitude, sustain: 0, release: duration
end

define :play_the_pattern do |time_state_note, transposition|
  pattern = get[:pattern].take(get[:pattern].length)
  sync :time
  for i in 0..(pattern.length - 1)
    offset = i == pattern.length - 1 ? 0.01 : 0
    play_now pattern[i][get[:PATTERN_NOTE_VALUE]], transposition, choose_next_amp + 0.1,
      pattern[i][get[:PATTERN_NOTE_DURATION]] - offset
    set time_state_note, pattern[i][get[:PATTERN_NOTE_VALUE]]
    sleep pattern[i][get[:PATTERN_NOTE_DURATION]] - offset
  end
end

define :quit do
  sleep rrand_i(get[:quit_time_min], get[:quit_time_max])
end

define :switch_pattern do
  set :pattern, get[:patterns].choose
end

define :wait_till_turn do |pTurn|
  while (get[:turn] != pTurn)
    sync :time
    sleep 0.99
  end
  quit
  set :turn, get[:turn] + 1
end

live_loop :keep_time do
  cue :time
  tick
  sleep 1
end

in_thread(name: :pattern_play) do
  loop do
    if one_in(get[:pattern_generation_factor])
      generate_pattern
    end
    if get[:patterns].length > 0 && one_in(get[:pattern_switch_factor])
      switch_pattern
    end
    sleep get[:pattern_play_delay]
  end
end

in_thread(name: :play_0) do
  loop do
    base
    quit
  end
end

in_thread(name: :play_1) do
  wait_till_turn 1
  loop do
    contra 1, :note_1
    quit
  end
end

in_thread(name: :play_2) do
  wait_till_turn 2
  loop do
    contra 2, :note_2
    quit
  end
end

in_thread(name: :play_3) do
  wait_till_turn 3
  loop do
    contra 3, :note_3
    quit
  end
end

##| in_thread(name: :beat) do
##|   play_beat
##| end