77 lines
1.9 KiB
Lua
77 lines
1.9 KiB
Lua
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conductor=klass()
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function conductor:init(track,time)
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self.track=track
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self.time=time
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end
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function conductor:perform(
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performers,
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pitchblocks,
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notation
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)
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local n_performers=#performers
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local n_pitchblocks=#pitchblocks.chunks
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assert(#notation==n_performers,"need "..n_performers.." parts for "..n_performers.." performers")
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for i=1,n_performers do
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assert(#notation[i]==n_pitchblocks,"performers should have "..n_pitchblocks.." for "..n_pitchblocks.." pitchblocks")
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local function resolve_pitch(t,ix)
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local block = pitchblocks.chunks[t+1]
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assert_range(ix,0,#block,"pitch ix")
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return block[ix+1]
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end
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local running_note=nil
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local function touch_running_note(
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t,pitch,force_new,verbs
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)
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if force_new or (running_note and running_note.pitch != pitch) or (not running_note and pitch!=nil) then
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if running_note then
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performers[i].time=self.time+running_note.t
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performers[i]:play(t-running_note.t,running_note.pitch,running_note.verbs)
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running_note=nil
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end
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if pitch then
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running_note={
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t=t,
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pitch=pitch,
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verbs=verbs
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}
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end
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end
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end
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for t=0,n_pitchblocks-1 do
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local note_char=notation[i][t+1]
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local pitch
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local force_start_new
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local verbs=""
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if note_char >= "a" and note_char <= "z" then
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ix = ord(note_char) - ord("a")
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pitch=resolve_pitch(t,ix)
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elseif note_char >= "A" and note_char <= "Z" then
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ix = ord(note_char) - ord("A")
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pitch=resolve_pitch(t,ix)
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force_start_new = true
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elseif note_char == "." then
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pitch=nil
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elseif note_char == "@" then
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pitch,verbs=0,"kick"
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elseif note_char == "!" then
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pitch,verbs=0,"snare"
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elseif note_char == "'" then
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pitch,verbs=0,"hihat"
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else
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assert(false,"wtf? "..note_char)
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end
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touch_running_note(t,pitch,force_start_new,verbs)
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end
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touch_running_note(n_pitchblocks,nil)
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performers[i].time=self.time
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end
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end
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