unsafe void Update()
{
if (_sourceTexture == null || !_sourceTexture.IsCreated())
{
return;
}
var w = _sourceTexture.width / 2;
var h = _sourceTexture.height * (_alphaSupport ? 3 : 2) / 2;
ReadbackBuffer buffer = null;
if (_readbackQueue.Count > 0 && _readbackQueue.Peek().IsCompleted)
{
buffer = _sending;
_sending = _readbackQueue.Dequeue();
// Wait for the plugin to complete the previous frame.
NDI_SyncSender(_plugin);
// Get the pointer to the data buffer, and give it to the plugin.
NDI_SendFrame(
_plugin, (IntPtr)_sending.Data.GetUnsafePtr(),
_sourceTexture.width, _sourceTexture.height,
_alphaSupport ? FourCC.UYVA : FourCC.UYVY
);
NDI_SyncSender(_plugin);
// Dispose the buffer if it can't be reused.
if (_sending.Source.count != w * h)
{
NDI_SyncSender(_plugin); // Wait before disposing.
DisposeBuffer(_sending);
_sending = null;
}
}
// Readback buffer allocation
if (buffer == null)
{
buffer = new ReadbackBuffer(new ComputeBuffer(w * h, 4));
}
// Invoke the compute.
_compute.SetTexture(0, "Source", _sourceTexture);
_compute.SetBuffer(0, "Destination", buffer.Source);
_compute.Dispatch(0, w / 8, _sourceTexture.height / 8, 1);
if (_alphaSupport)
{
_compute.SetTexture(1, "Source", _sourceTexture);
_compute.SetBuffer(1, "Destination", buffer.Source);
_compute.Dispatch(1, w / 16, _sourceTexture.height / 8, 1);
}
// Push to the readback queue.
buffer.RequestReadback();
_readbackQueue.Enqueue(buffer);
}
void DisposeBuffer(ReadbackBuffer buffer)
{
buffer.Source.Dispose();
buffer.Dispose();
}