/// <summary>
/// Read pixel data from <paramref name="intPtr"/> into our local buffer
/// and return the total number of bytes read.
/// </summary>
/// <param name="header"></param>
/// <param name="intPtr"></param>
/// <returns></returns>
internal int ReadPixelData(InteropRenderHeader header, IntPtr intPtr)
{
var pixelArraySize = header.width * header.height * 3;
lock (renderTextureLock)
{
if (Pixels == IntPtr.Zero)
{
InteropLogger.Debug($"Allocating {header.width} x {header.height}");
Pixels = Marshal.AllocHGlobal(pixelArraySize);
}
else if (header.width != Header.width || header.height != Header.height)
{
// If the inbound data resized - resize our buffer
InteropLogger.Debug($"Reallocating {header.width} x {header.height}");
Pixels = Marshal.ReAllocHGlobal(Pixels, new IntPtr(pixelArraySize));
}
// Could do a Buffer.MemoryCopy here - but I'm locked to
// .NET 4.5 due to the DllExport library we're using.
UnsafeNativeMethods.CopyMemory(Pixels, intPtr, (uint)pixelArraySize);
Header = header;
Frame++;
}
return(pixelArraySize);
}
/// <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();
}