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(library (strigoform audio)
(export load-audio
audio-play
audio-pause
audio-volume
set-audio-volume!
set-audio-loop!
audio-seek
load-sound-effect
sound-effect-play)
(import (scheme base)
(hoot ffi)
(hoot match)
(only (hoot syntax) define*)
(strigoform element))
(define-foreign load-audio
"audio" "new"
(ref string) -> (ref null extern))
(define-foreign audio-play
"audio" "play"
(ref null extern) -> none)
(define-foreign audio-pause
"audio" "pause"
(ref null extern) -> none)
(define-foreign audio-volume
"audio" "volume"
(ref null extern) -> f64)
(define-foreign set-audio-volume!
"audio" "setVolume"
(ref null extern) f64 -> none)
(define-foreign set-audio-loop!
"audio" "setLoop"
(ref null extern) i32 -> none)
(define-foreign audio-seek
"audio" "seek"
(ref null extern) f64 -> none)
;; So we can play many overlapping audio samples at once.
(define (load-sound-effect src)
(let* ((k 32)
(audio (load-audio src))
(vec (make-vector k)))
(do ((i 0 (+ i 1)))
((= i k))
(vector-set! vec i (clone-element audio)))
(vector 0 vec)))
(define* (sound-effect-play sound #:optional (volume 1.0))
(match sound
(#(i vec)
(let ((audio (vector-ref vec i)))
(set-audio-volume! audio volume)
(audio-play audio)
(vector-set! sound 0 (modulo (+ i 1) (vector-length vec))))))))
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