69 lines
2 KiB
Text
69 lines
2 KiB
Text
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(local pxl8 (require :pxl8))
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(var time 0)
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(var step 0)
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(var ctx nil)
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(var params nil)
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(var bass-params nil)
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(var playing false)
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(local melody [60 64 67 72 67 64 60 64 67 72 76 72 67 64 62 66 69 74 69 66 62 66 69 74 78 74 69 66])
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(local bass [36 50 40 36 38 38 50 38])
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(local step-duration 0.15)
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(fn init []
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(set ctx (pxl8.sfx_context_create))
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(local delay (pxl8.sfx_delay_create {:time_l 350 :time_r 500 :feedback 0.4 :mix 0.25}))
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(local reverb (pxl8.sfx_reverb_create {:room 0.5 :damping 0.5 :mix 0.3}))
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(local compressor (pxl8.sfx_compressor_create {:threshold -12 :ratio 4 :attack 10 :release 100}))
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(pxl8.sfx_context_append_node ctx delay)
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(pxl8.sfx_context_append_node ctx reverb)
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(pxl8.sfx_context_append_node ctx compressor)
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(pxl8.sfx_mixer_attach ctx)
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(set params (pxl8.sfx_voice_params
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{:waveform pxl8.SFX_WAVE_TRIANGLE
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:attack 0.005 :decay 0.08 :sustain 0.0 :release 0.05
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:filter_type pxl8.SFX_FILTER_LOWPASS
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:filter_cutoff 2500 :filter_resonance 0.15
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:filter_attack 0.005 :filter_decay 0.1 :filter_sustain 0.1 :filter_release 0.05
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:filter_env_depth 1500
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:fx_send 0.3}))
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(set bass-params (pxl8.sfx_voice_params
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{:waveform pxl8.SFX_WAVE_SQUARE
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:attack 0.005 :decay 0.1 :sustain 0.0 :release 0.05
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:filter_type pxl8.SFX_FILTER_LOWPASS
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:filter_cutoff 600 :filter_resonance 0.2
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:fx_send 0.2})))
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(fn start []
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(set playing true)
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(set time 0)
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(set step 0))
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(fn stop []
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(set playing false)
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(pxl8.sfx_stop_all ctx))
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(fn update [dt]
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(when playing
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(set time (+ time dt))
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(when (>= time step-duration)
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(set time (- time step-duration))
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(local note (. melody (+ 1 (% step (length melody)))))
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(pxl8.sfx_play_note ctx note params 0.4)
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(when (= (% step 4) 0)
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(local bass-note (. bass (+ 1 (% (math.floor (/ step 4)) (length bass)))))
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(pxl8.sfx_play_note ctx bass-note bass-params 0.35))
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(set step (+ step 1)))))
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{:init init
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:start start
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:stop stop
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:update update
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:is-playing (fn [] playing)}
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