mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 21:32:20 +02:00
79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
// Copyright 2015 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build js
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package audio
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import (
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"github.com/gopherjs/gopherjs/js"
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)
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// Keep this so as not to be destroyed by GC.
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var node js.Object
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var context js.Object
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const bufferSize = 1024
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var (
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bufferL = make([]float32, 0)
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bufferR = make([]float32, 0)
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)
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func min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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func Init() {
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context = js.Global.Get("AudioContext").New()
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// TODO: ScriptProcessorNode will be replaced Audio WebWorker.
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// https://developer.mozilla.org/ja/docs/Web/API/ScriptProcessorNode
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const bufLen = 1024
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node = context.Call("createScriptProcessor", bufLen, 0, 2)
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node.Call("addEventListener", "audioprocess", func(e js.Object) {
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l := e.Get("outputBuffer").Call("getChannelData", 0)
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r := e.Get("outputBuffer").Call("getChannelData", 1)
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for i := 0; i < bufLen; i++ {
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// TODO: Use copyFromChannel?
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if len(bufferL) <= i {
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l.SetIndex(i, 0)
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r.SetIndex(i, 0)
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continue
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}
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l.SetIndex(i, bufferL[i])
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r.SetIndex(i, bufferR[i])
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}
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// TODO: Will the array heads be released properly on GopherJS?
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usedLen := min(bufLen, len(bufferL))
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bufferL = bufferL[usedLen:]
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bufferR = bufferR[usedLen:]
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})
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}
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func Start() {
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// TODO: For iOS, node should be connected with a buffer node.
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node.Call("connect", context.Get("destination"))
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}
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func Append(l []float32, r []float32) {
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if len(l) != len(r) {
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panic("len(l) must equal to len(r)")
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}
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bufferL = append(bufferL, l...)
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bufferR = append(bufferR, r...)
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}
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