125 lines
2.6 KiB
Racket
125 lines
2.6 KiB
Racket
#lang racket
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(require rsc3 rhs/rhs)
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;; --- gui stuff
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(require (prefix-in gui: racket/gui))
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(define frame (new gui:frame% [label "Example"]))
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;; parent should be a frame
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(new gui:slider% [parent frame]
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[label "freq"]
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[min-value 300]
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[max-value 1000]
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[init-value 400]
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;; callback receives the slider object and an event object
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[callback (lambda (s event)
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(send-msg (n-set1 1001 "freq" (gui:send s get-value))))])
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(gui:send frame show #t)
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;; hypothetical usage
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#;(add-filter track2 (lpf #:resonance .3
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#:cutoff (slider 300 800 500)))
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(define (slider min-n max-n init)
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(define bus-id 16)
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(new gui:slider% [parent frame]
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[label "amp"]
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[min-value min-n]
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[max-value max-n]
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[init-value init]
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;; callback receives the slider object and an event object
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[callback (lambda (s event)
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(send-msg
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(c-set1 bus-id (/ (gui:send s get-value) 1000))))])
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(in 1 kr bus-id))
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; -------
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;; simplifies sending osc messages to server
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(define (send-msg msg)
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(with-sc3 (lambda (fd)
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(send fd msg))))
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(define current-node-id 1000)
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(define (gen-node-id)
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(set! current-node-id (add1 current-node-id))
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current-node-id)
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(define (wave-instrument wave-func)
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(letc ([bus 0]
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[freq 440])
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(out bus (mul 0.2 (wave-func ar freq 0)))))
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(define sin-instrument
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(letc ([bus 0]
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[freq 440])
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(out bus (mul (slider 100 800 200) (sin-osc ar freq 0)))))
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(define saw-instrument
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(letc ([bus 0]
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[freq 440])
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(out bus (mul 0.2 (saw ar freq)))))
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;; setup
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;; show osc messages on server
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(with-sc3 (lambda (fd)
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(send fd (dump-osc 1))))
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(with-sc3 reset)
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;; send synthdefs
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(with-sc3 (lambda (fd)
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(send-synth fd "sin-inst" sin-instrument) ; (wave-instrument sin-osc))
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(send-synth fd "saw-inst" saw-instrument)))
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(define (make-instrument ins)
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(match ins
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['sin (let ([node-id (gen-node-id)])
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(send-msg (s-new0 "sin-inst" node-id 1 1))
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; don't make sound upon creation
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(send-msg (n-run1 node-id 0))
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node-id)]
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[else (error "unknown instrument used")]))
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(define (note-on inst freq track)
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(send-msg (n-set1 inst "freq" freq))
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(send-msg (n-set1 inst "bus" track))
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(send-msg (n-run1 inst 1)))
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(define (note-off inst)
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(send-msg (n-run1 inst 0)))
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#|
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- to stop/run:
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(send-msg (n-run1 1001 1))
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|#
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;; ======== test run ===========
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(define my-sin (make-instrument 'sin))
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;; example:
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; (note-on my-sin 500 1)
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; (note-off my-sin)
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