1 files changed, 55 insertions, 0 deletions
diff --git a/strigoform/audio.scm b/strigoform/audio.scm
new file mode 100644
index 0000000..1c89025
--- /dev/null
+++ b/strigoform/audio.scm
@@ -0,0 +1,55 @@
+(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))))))))