mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-21 05:42:18 +02:00
129 lines
3.0 KiB
Go
129 lines
3.0 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 internal
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"log"
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"runtime"
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"sync"
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"time"
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"github.com/timshannon/go-openal/openal"
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)
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var channelsMutex = sync.Mutex{}
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func withChannels(f func()) {
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channelsMutex.Lock()
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defer channelsMutex.Unlock()
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f()
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}
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func toBytesWithPadding(l, r []int16, size int) []byte {
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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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b := &bytes.Buffer{}
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for i := 0; i < len(l); i++ {
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if err := binary.Write(b, binary.LittleEndian, []int16{l[i], r[i]}); err != nil {
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panic(err)
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}
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}
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if 0 < size-len(l) {
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if err := binary.Write(b, binary.LittleEndian, make([]int16, (size-len(l))*2)); err != nil {
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panic(err)
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}
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}
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return b.Bytes()
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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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device := openal.OpenDevice("")
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context := device.CreateContext()
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context.Activate()
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if alErr := openal.GetError(); alErr != 0 {
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log.Printf("OpenAL initialize error: %d", alErr)
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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 := openal.NewSources(MaxChannel)
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close(ch)
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const bufferSize = 512
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emptyBytes := make([]byte, 4*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 := openal.NewBuffers(bufferNum)
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for _, buffer := range buffers {
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buffer.SetData(openal.FormatStereo16, emptyBytes, SampleRate)
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source.QueueBuffer(buffer)
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}
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source.Play()
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if alErr := openal.GetError(); alErr != 0 {
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panic(fmt.Sprintf("OpenAL error: %d", alErr))
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}
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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([]openal.Buffer, processed)
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source.UnqueueBuffers(buffers)
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for _, buffer := range buffers {
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l, r := loadChannelBuffer(ch, bufferSize)
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b := toBytesWithPadding(l, r, bufferSize)
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buffer.SetData(openal.FormatStereo16, b, SampleRate)
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source.QueueBuffer(buffer)
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}
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if source.State() == openal.Stopped {
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source.Rewind()
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source.Play()
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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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func start() {
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// Do nothing
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}
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