refact

inc/audio/audio.songs.lua

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+-- DDR Arrow Spawn Patterns
+-- Each song defines when arrows should spawn, synced to music beats
+
+Songs = {
+  -- Example song pattern
+  test_song = {
+    name = "Test Song",
+    bpm = 120, -- Beats per minute (for reference)
+    fps = 60, -- Frames per second (TIC-80 default)
+    end_frame = 570, -- Frame when song ends (last note)
+    -- Arrow spawn pattern
+    -- Each entry defines when (in frames) and which direction arrow spawns
+    -- Formula: frame = (beat / bpm) * 60 * fps
+    -- For 120 BPM: 1 beat = 30 frames, 2 beats = 60 frames, etc.
+    pattern = {
+      -- Beat 1-4 (intro)
+      {frame = 30, dir = "left"},
+      {frame = 60, dir = "down"},
+      {frame = 90, dir = "up"},
+      {frame = 120, dir = "right"},
+      -- Beat 5-8 (faster)
+      {frame = 135, dir = "left"},
+      {frame = 150, dir = "right"},
+      {frame = 165, dir = "left"},
+      {frame = 180, dir = "right"},
+      -- Beat 9-12 (complex pattern)
+      {frame = 210, dir = "left"},
+      {frame = 210, dir = "right"}, -- simultaneous
+      {frame = 240, dir = "up"},
+      {frame = 240, dir = "down"}, -- simultaneous
+      {frame = 270, dir = "left"},
+      {frame = 300, dir = "right"},
+      -- Beat 13-16 (rapid sequence)
+      {frame = 330, dir = "left"},
+      {frame = 345, dir = "down"},
+      {frame = 360, dir = "up"},
+      {frame = 375, dir = "right"},
+      {frame = 390, dir = "left"},
+      {frame = 405, dir = "down"},
+      {frame = 420, dir = "up"},
+      {frame = 435, dir = "right"},
+      -- Beat 17-20 (finale)
+      {frame = 465, dir = "up"},
+      {frame = 465, dir = "down"},
+      {frame = 495, dir = "left"},
+      {frame = 495, dir = "right"},
+      {frame = 525, dir = "up"},
+      {frame = 540, dir = "down"},
+      {frame = 555, dir = "left"},
+      {frame = 570, dir = "right"}
+    }
+  },
+  test_song_2 = {
+    name = "Test Song 2",
+    bpm = 120, -- Beats per minute (for reference)
+    fps = 60, -- Frames per second (TIC-80 default)
+    end_frame = 570, -- Frame when song ends (last note)
+    -- Arrow spawn pattern
+    -- Each entry defines when (in frames) and which direction arrow spawns
+    -- Formula: frame = (beat / bpm) * 60 * fps
+    -- For 120 BPM: 1 beat = 30 frames, 2 beats = 60 frames, etc.
+    pattern = {
+      -- Beat 1-4 (intro)
+      {frame = 30, dir = "left"},
+      {frame = 60, dir = "down"},
+      {frame = 90, dir = "up"},
+      {frame = 120, dir = "right"},
+      -- Beat 5-8 (faster)
+      {frame = 135, dir = "left"},
+      {frame = 150, dir = "right"},
+      {frame = 165, dir = "left"},
+      {frame = 180, dir = "right"},
+      -- Beat 9-12 (complex pattern)
+      {frame = 210, dir = "left"},
+      {frame = 210, dir = "right"}, -- simultaneous
+      {frame = 240, dir = "up"},
+      {frame = 240, dir = "down"}, -- simultaneous
+      {frame = 270, dir = "left"},
+      {frame = 300, dir = "right"},
+      -- Beat 13-16 (rapid sequence)
+      {frame = 330, dir = "left"},
+      {frame = 345, dir = "down"},
+      {frame = 360, dir = "up"},
+      {frame = 375, dir = "right"},
+      {frame = 390, dir = "left"},
+      {frame = 405, dir = "down"},
+      {frame = 420, dir = "up"},
+      {frame = 435, dir = "right"},
+      -- Beat 17-20 (finale)
+      {frame = 465, dir = "up"},
+      {frame = 465, dir = "down"},
+      {frame = 495, dir = "left"},
+      {frame = 495, dir = "right"},
+      {frame = 525, dir = "up"},
+      {frame = 540, dir = "down"},
+      {frame = 555, dir = "left"},
+      {frame = 570, dir = "right"}
+    }
+  },
+  -- Random mode (no predefined pattern, spawns randomly)
+  random = {
+    name = "Random Mode",
+    bpm = 0, -- Not applicable for random mode
+    fps = 60,
+    end_frame = nil, -- No end frame for random mode
+    pattern = {} -- Empty, will spawn randomly in game
+  }
+}
+
+--- Converts beats to frames.
+-- @param beat number The beat number.
+-- @param bpm number Beats per minute.
+-- @param[opt] fps number Frames per second (default: 60).
+-- @return number The corresponding frame number.
+function frame_from_beat(beat, bpm, fps)
+  fps = fps or 60
+  local seconds_per_beat = 60 / bpm
+  local frames_per_beat = seconds_per_beat * fps
+  return math.floor(beat * frames_per_beat)
+end
+
+--- Converts beat notation to frame pattern.
+-- @param beats table A table of beat data, e.g., {{1, "left"}, {2, "down"}}.
+-- @param bpm number Beats per minute.
+-- @param[opt] fps number Frames per second (default: 60).
+-- @return table The generated pattern.
+function beats_to_pattern(beats, bpm, fps)
+  fps = fps or 60
+  local pattern = {}
+  for _, beat_data in ipairs(beats) do
+    local beat = beat_data[1]
+    local dir = beat_data[2]
+    table.insert(pattern, {
+      frame = frame_from_beat(beat, bpm, fps),
+      dir = dir
+    })
+  end
+  return pattern
+end
+
+-- Example of creating a song using beat notation:
+--[[
+Songs.custom_song = {
+  name = "Custom Song",
+  bpm = 130,
+  fps = 60,
+  pattern = beats_to_pattern({
+    {1, "left"},
+    {2, "down"},
+    {3, "up"},
+    {4, "right"},
+    {4.5, "left"},
+    {5, "right"}
+  }, 130)
+}
+]]