Monogame slow inside WPF

@bbbb0x wrote:

Hey,

I'm trying to render via Monogame inside multiple WPF controls (as preview what it's going to look like) and I have serve performance issues. I am rendering to renderTargets and then transforming them into bitmaps. The issue is this process takes way too long for a frame (50 ms) and freezes the window. Even when outsourcing it to a different thread, the rendering would be too slow and my PC is quite powerful, so I might be way worse on others. Here his how I transform the Monogame RenderTarget2D to a WriteableBitmap:

`

        Stopwatch sw0 = new Stopwatch();

        sw0.Start();

        renderTarget.GetData(buffer);
      
        // get the data from the render target


        sw0.Stop();
        Console.WriteLine("Get data duration: " + sw0.ElapsedMilliseconds + " ms");
       
        // because the only 32 bit pixel format for WPF is 
        // BGRA but XNA is all RGBA, we have to swap the R 
        // and B bytes for each pixel

        Stopwatch sw = new Stopwatch();
        sw.Start();
        for (int i = 0; i < buffer.Length - 2; i += 4)
        {
            byte r = buffer[i];
            buffer[i] = buffer[i + 2];
            buffer[i + 2] = r;
        }
        sw.Stop();
        Console.WriteLine("Pixel shift duration: " + sw.ElapsedMilliseconds + " ms");

        Stopwatch sw2 = new Stopwatch();
        sw2.Start();

        // write our pixels into the bitmap source
        writeableBitmap.Lock();
        Marshal.Copy(buffer, 0, writeableBitmap.BackBuffer, buffer.Length);
        writeableBitmap.AddDirtyRect(
            new Int32Rect(0, 0, renderTarget.Width, renderTarget.Height));
        writeableBitmap.Unlock();

        sw2.Stop();
        Console.WriteLine("To bitmap duration: " + sw2.ElapsedMilliseconds + " ms");`

I implemented some stopwatches to measure time. rendertarget.GetData costs the most time. The pixel shifting costs medium time too. Any way to fix this? As far as I read WPF controls have no HWND, so cannot render directly into them.

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