mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
88 lines
2.2 KiB
Go
88 lines
2.2 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,!windows
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package audio
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import (
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"log"
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"runtime"
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"time"
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"golang.org/x/mobile/exp/audio/al"
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)
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func initialize() {
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// Creating OpenAL device must be done after initializing UI. I'm not sure the reason.
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ch := make(chan struct{})
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go func() {
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runtime.LockOSThread()
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if err := al.OpenDevice(); err != nil {
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log.Printf("OpenAL initialize error: %v", err)
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close(ch)
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// Graceful ending: Audio is not available on Travis CI.
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return
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}
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audioEnabled = true
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sources := al.GenSources(MaxChannel)
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close(ch)
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const bufferSize = 2048
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emptyBytes := make([]byte, bufferSize)
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for _, source := range sources {
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// 3 is the least number?
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// http://stackoverflow.com/questions/14932004/play-sound-with-openalstream
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const bufferNum = 4
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buffers := al.GenBuffers(bufferNum)
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for _, buffer := range buffers {
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buffer.BufferData(al.FormatStereo16, emptyBytes, SampleRate)
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source.QueueBuffers(buffer)
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}
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al.PlaySources(source)
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}
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for {
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oneProcessed := false
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for ch, source := range sources {
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processed := source.BuffersProcessed()
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if processed == 0 {
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continue
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}
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oneProcessed = true
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buffers := make([]al.Buffer, processed)
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source.UnqueueBuffers(buffers...)
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for _, buffer := range buffers {
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b := make([]byte, bufferSize)
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copy(b, loadChannelBuffer(ch, bufferSize))
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buffer.BufferData(al.FormatStereo16, b, SampleRate)
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source.QueueBuffers(buffer)
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}
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if source.State() == al.Stopped {
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al.RewindSources(source)
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al.PlaySources(source)
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}
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}
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if !oneProcessed {
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time.Sleep(1 * time.Millisecond)
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}
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}
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}()
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<-ch
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}
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