/// <summary>
/// Copy the RenderTexture data from the ViewportController into shared memory with Blender.
///
/// <para>
/// The <paramref name="pixelsRGB24Func"/> callback is executed IFF we have room in the
/// buffer to write - letting us skip the heavy pixel copy operations if the consumer
/// is backed up in processing data.
/// </para>
/// </summary>
internal void PublishRenderTexture(ViewportController viewport, Func <byte[]> pixelsRGB24Func)
{
if (!IsConnected)
{
Debug.LogWarning("Cannot send RT - No connection");
}
Profiler.BeginSample("Write wait on pixelsProducer");
int bytesWritten = pixelsProducer.Write((ptr) => {
// If we have a node we can write on, actually do the heavy lifting
// of pulling the pixel data from the RenderTexture (in the callback)
// and write into the buffer.
var pixelsRGB24 = pixelsRGB24Func();
Profiler.BeginSample("Write Pixels into Shared Memory");
// Pack a header into shared memory
var header = new InteropRenderHeader
{
viewportId = viewport.ID,
width = viewport.Width,
height = viewport.Height
};
var headerSize = FastStructure.SizeOf <InteropRenderHeader>();
FastStructure.WriteBytes(ptr, FastStructure.ToBytes(ref header), 0, headerSize);
// Copy render image data into shared memory
FastStructure.WriteBytes(ptr + headerSize, pixelsRGB24, 0, pixelsRGB24.Length);
/*InteropLogger.Debug($"Writing {pixelsRGB24.Length} bytes with meta {header.width} x {header.height} and pix 0 is " +
* $"{pixelsRGB24[0]}, {pixelsRGB24[1]}, {pixelsRGB24[2]}"
* );*/
Profiler.EndSample();
return(headerSize + pixelsRGB24.Length);
}, WRITE_WAIT);
/*
* if (bytesWritten < 1)
* {
* Debug.LogWarning("pixelsProducer buffer is backed up. Skipped write.");
* }*/
Profiler.EndSample();
}
/// <summary>
/// Write <paramref name="message"/> into the next available
/// node's buffer at <paramref name="ptr"/>.
/// </summary>
/// <param name="message"></param>
/// <param name="ptr"></param>
/// <returns></returns>
private int WriteMessage(InteropMessage message, IntPtr ptr)
{
int bytesWritten = 0;
// Write the target name (varying length string)
byte[] target = Encoding.UTF8.GetBytes(message.target);
int targetLen = target.Length;
FastStructure.StructureToPtr(ref targetLen, ptr + bytesWritten);
bytesWritten += FastStructure.SizeOf <int>();
if (targetLen > 0)
{
FastStructure.WriteBytes(ptr + bytesWritten, target, 0, targetLen);
bytesWritten += targetLen;
}
// Write the message header
var headerSize = FastStructure.SizeOf <InteropMessageHeader>();
var header = message.header;
FastStructure.StructureToPtr(ref header, ptr + bytesWritten);
bytesWritten += headerSize;
// If there's a custom producer, execute it for writing the payload
if (message.producer != null)
{
bytesWritten += message.producer(message.target, header, ptr + bytesWritten);
}
// If there's a payload included with the message, copy it
if (message.payload != null)
{
FastStructure.WriteBytes(ptr + bytesWritten, message.payload, 0, message.payload.Length);
bytesWritten += message.payload.Length;
}
// InteropLogger.Debug($"Produce {bytesWritten} bytes - {header.type} for `{message.target}`");
return(bytesWritten);
}
