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Change audio approach.

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This commit is contained in:
Brad Nelson
2022-11-17 23:20:40 -08:00
parent dd607401e4
commit 5437048f33
1 changed files with 24 additions and 23 deletions
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47
web/platform.fs
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@ -729,34 +729,35 @@ JSWORD: release { handle }
~
r~
context.audio_contexts = [];
context.newAudio = function() {
if (context.audio_contexts.length < 30) {
var ctx = new AudioContext();
context.audio_contexts.push(ctx);
return ctx;
context.audio_context = null;
context.audio_channels = [];
context.initAudio = function() {
if (context.audio_context !== null) {
return;
}
context.audio_context = new AudioContext();
var master = context.audio_context.createGain();
master.connect(context.audio_context.destination);
master.gain.value = 1/8;
for (var i = 0; i < 8; ++i) {
var oscillator = context.audio_context.createOscillator();
oscillator.type = 'sine';
var gain = context.audio_context.createGain();
gain.gain.value = 0;
oscillator.connect(gain);
gain.connect(master);
oscillator.start();
context.audio_channels.push([gain, oscillator]);
}
var ctx = context.audio_contexts[0];
context.audio_contexts.splice(0, 1);
context.audio_contexts.push(ctx);
return ctx;
};
~ jseval
JSWORD: tone { pitch duration volume -- }
var audio = context.newAudio();
var oscillator = audio.createOscillator();
oscillator.type = 'sine';
oscillator.frequency.setValueAtTime(27.5 * Math.pow(2, (pitch - 21) / 12), audio.currentTime);
var gain = audio.createGain();
gain.gain.setValueAtTime(0, audio.currentTime);
gain.gain.linearRampToValueAtTime(volume / 100, audio.currentTime + duration / 1000 * 0.1);
gain.gain.linearRampToValueAtTime(volume / 100, audio.currentTime + duration / 1000 * 0.9);
gain.gain.linearRampToValueAtTime(0, audio.currentTime + duration / 1000);
oscillator.connect(gain);
gain.connect(audio.destination);
oscillator.start();
JSWORD: tone { pitch volume channel -- }
context.initAudio();
context.audio_channels[channel][0].gain.value = volume / 100;
context.audio_channels[channel][1].frequency.value = 27.5 * Math.pow(2, (pitch - 21) / 12);
~
: silence 8 0 do 0 0 i tone loop ;
JSWORD: ms-ticks { -- ms }
return Date.now();