func screenRenderLoop(evtLoop *spectrum.EventLoop, screenChannel <-chan *spectrum.DisplayData, renderer screen_renderer_t) {
terminating := false
shutdown.Add(1)
for {
select {
case <-evtLoop.Pause:
terminating = true
evtLoop.Pause <- 0
case <-evtLoop.Terminate:
// Terminate this Go routine
if evtLoop.App().Verbose {
evtLoop.App().PrintfMsg("screen render loop: exit")
}
evtLoop.Terminate <- 0
shutdown.Done()
return
case screen := <-screenChannel:
if screen != nil {
if !terminating {
renderer.render(screen)
}
} else {
done := evtLoop.Delete()
go func() { <-done }()
}
}
}
}
// Forward 'AudioData' objects from 'audio.data' to 'audio.playback'
func forwarderLoop(evtLoop *spectrum.EventLoop, audio *SDLAudio) {
audioDataChannel := audio.data
playback_closed := false
shutdown.Add(1)
for {
select {
case <-evtLoop.Pause:
// Remove all enqueued AudioData objects
loop:
for {
select {
case <-audio.playback:
default:
break loop
}
}
audio.mutex.Lock()
{
if !audio.sdlAudioUnpaused {
// Unpause SDL Audio. This is needed in order to avoid
// a potential deadlock on 'sdl_audio.SendAudio_int16()'.
// (If audio is paused, 'sdl_audio.SendAudio_int16()' waits indefinitely.)
sdl_audio.PauseAudio(false)
audio.sdlAudioUnpaused = true
}
}
audio.mutex.Unlock()
close(audio.playback)
playback_closed = true
<-audio.playbackLoopFinished
sdl_audio.CloseAudio()
audio.mutex.Lock()
forwarderLoopFinished := audio.forwarderLoopFinished
audio.mutex.Unlock()
if forwarderLoopFinished != nil {
forwarderLoopFinished <- 0
}
evtLoop.Pause <- 0
case <-evtLoop.Terminate:
// Terminate this Go routine
if evtLoop.App().Verbose {
evtLoop.App().PrintfMsg("audio forwarder loop: exit")
}
evtLoop.Terminate <- 0
shutdown.Done()
return
case audioData := <-audioDataChannel:
if audioData != nil {
if !playback_closed {
audio.bufferAdd()
audio.playback <- audioData
}
} else {
// Prevent any future sends via the 'audio.data' channel
close(audio.data)
// Replace 'audioDataChannel' with nil,
// so that future executions of the 'select' statement ignore the "<-audioDataChannel" case
audioDataChannel = nil
// Go to the '<-evtLoop.Pause' case
done := evtLoop.Delete()
go func() { <-done }()
}
}
}
}