From 3986c407ff55896fc05e264830a9fd2597b5f04e Mon Sep 17 00:00:00 2001
From: Felix Roos <flix91@gmail.com>
Date: Sun, 7 Aug 2022 23:53:14 +0200
Subject: [PATCH] cache loaded soundfonts

---
 packages/soundfonts/index.mjs   |  4 ++--
 packages/soundfonts/sfumato.mjs | 14 +++++++++++---
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/packages/soundfonts/index.mjs b/packages/soundfonts/index.mjs
index 2c4ffcc6..3c5c226c 100644
--- a/packages/soundfonts/index.mjs
+++ b/packages/soundfonts/index.mjs
@@ -1,6 +1,6 @@
 import { getFontBufferSource } from './fontloader.mjs';
 import * as soundfontList from './list.mjs';
-import { loadSoundfont, startPresetNote } from 'sfumato';
-import './sfumato.mjs';
+import { startPresetNote } from 'sfumato';
+import { loadSoundfont } from './sfumato.mjs';
 
 export { loadSoundfont, startPresetNote, getFontBufferSource, soundfontList };
diff --git a/packages/soundfonts/sfumato.mjs b/packages/soundfonts/sfumato.mjs
index f13712a5..1cca2ffe 100644
--- a/packages/soundfonts/sfumato.mjs
+++ b/packages/soundfonts/sfumato.mjs
@@ -1,7 +1,5 @@
 import { Pattern } from '@strudel.cycles/core';
-import { /* loadSoundfont, */ startPresetNote } from 'sfumato';
-
-// TODO: find way to cache loadSoundfont
+import { loadSoundfont as _loadSoundfont, startPresetNote } from 'sfumato';
 
 Pattern.prototype.soundfont = function (sf, n = 0) {
   return this.onTrigger((t, h, ct) => {
@@ -14,3 +12,13 @@ Pattern.prototype.soundfont = function (sf, n = 0) {
     stop(deadline + h.duration);
   });
 };
+
+const soundfontCache = new Map();
+export function loadSoundfont(url) {
+  if (soundfontCache.get(url)) {
+    return soundfontCache.get(url);
+  }
+  const sf = _loadSoundfont(url);
+  soundfontCache.set(url, sf);
+  return sf;
+}