internal static void Swap()
{
frames.Add(1.0);
if (!eglSwapBuffers(display, windowsurface))
{
throw new Exception("Unable to swap buffers " + eglGetError());
}
}
/// <summary>
/// Draw this image to the current OpenVG drawing surface.
/// </summary>
public void Draw()
{
if (handle == null)
{
throw new ObjectDisposedException("Some Image");
}
VG.vgDrawImage(handle);
VG.DetectError("Draw Image failed");
draws.Add(1.0);
}
private static void StartPlayback()
{
byte[] data = new byte[periodlength * framelength];
byte[] clear = new byte[periodlength * framelength];
int samples = 0;
int err;
Handle h = device_handle;
if (h == null)
{
return;
}
if ((err = snd_pcm_prepare(h)) < 0)
{
throw new Exception("Unable to prepare device " + snd_strerror(err));
}
while (true)
{
lock (h)
{
if (sfx_buffer == null || sfx_buffer.Count == 0)
{
sfx_buffer = null;
samples = snd_pcm_writei(h, clear, clear.Length / framelength);
}
else
{
samples = Math.Min(data.Length / framelength, sfx_buffer.Count / channels);
for (int i = 0; i < samples; i++)
{
short sample = (short)(sfx_buffer[i] * (float)short.MaxValue);
data[i << 1] = (byte)(sample & 0xff);
data[1 + (i << 1)] = (byte)((sample >> 8) & 0xff);
}
sfx_buffer.RemoveRange(0, samples);
samples = snd_pcm_writei(h, data, samples);
}
if (samples == -32) //EPIPE
{
if ((err = snd_pcm_prepare(h)) < 0)
{
throw new Exception("Unable to prepare device after underrun " + snd_strerror(err));
}
}
else if (samples == -77) //EBADFD when the sound device is closed
{
break;
}
else if (samples < 0)
{
throw new Exception("Unable to write frame " + snd_strerror(samples));
}
else
{
sample_counter.Add(samples);
}
}
// Without this wait, the sample writer gets starved for lock(h). (Since playback thread is high prio.) And playing a sound can be delayed for 10's of seconds.
Thread.Sleep(10); //TODO: This is a cheap, workable solution but not ideal. Revisit this with later resource abstraction refactoring. Mixing could happen in this loop?
}
}
