来自字节数组 Sharpdx 的 Texture2d

Question

I am a C#, SharpDX and Directx newbie. Please excuse my ignorance. I am following up on an old post: Exception of Texture2D.FromMemory() in SharpDX code . It was very helpful.

My goal:

1. Build a Texture2d from softwarebitmap.
2. Make the texture available to HLSL.

The way I approached it:

1. Using IMemoryBufferByteAccess, I was able to retrieve the pointer to byte and the total capacity of Frame. From the previous post, it seems I would need to use the DataRectangle to point to the byte array.
2. Have 2 textures with different descriptors- Texture1 (_staging_texture)- none binding flag, cpu write and read privileges, usage- staging. I created this texture with the datarectangle pointing to the byte array. Texture2 (_final_texture)- Shader binding flag, no cpu access, usage- default. This texture would be eventually made available to the shader. The intention was to use the copyResource function from Texture1 to Texture2.

Below, I copy my unpolished code for reference:

               bitmap = latestFrame.SoftwareBitmap;
                Windows.Graphics.Imaging.BitmapBuffer bitmapBuffer= bitmap.LockBuffer(Windows.Graphics.Imaging.BitmapBufferAccessMode.Read);
                Windows.Foundation.IMemoryBufferReference bufferReference = bitmapBuffer.CreateReference();
                var staging_descriptor = new Texture2DDescription
                {
                    Width = Width,
                    Height = Height,
                    MipLevels = 1,
                    ArraySize = 1,
                    Format = SharpDX.DXGI.Format.R8G8B8A8_UNorm,
                    SampleDescription = new SharpDX.DXGI.SampleDescription(1, 0),
                    Usage = ResourceUsage.Staging,
                    BindFlags = BindFlags.None,
                    CpuAccessFlags = CpuAccessFlags.Read | CpuAccessFlags.Write,
                    OptionFlags = ResourceOptionFlags.None
                };
                var final_descriptor = new Texture2DDescription
                {
                    Width = Width,
                    Height = Height,
                    MipLevels = 1,
                    ArraySize = 1,
                    Format = SharpDX.DXGI.Format.R8G8B8A8_UNorm,
                    SampleDescription = new SharpDX.DXGI.SampleDescription(1, 0),
                    Usage = ResourceUsage.Default,
                    BindFlags = BindFlags.ShaderResource,
                    CpuAccessFlags = CpuAccessFlags.None,
                    OptionFlags = ResourceOptionFlags.None
                };

                var dataRectangle = new SharpDX.DataRectangle();
                unsafe
                {
                    byte* dataInBytes;
                    uint capacityInBytes;
                    ((InteropStatics.IMemoryBufferByteAccess)bufferReference).GetBuffer(out dataInBytes, out capacityInBytes);                    
                    dataRectangle.DataPointer = (IntPtr)dataInBytes;
                    dataRectangle.Pitch = 4;
                }
                

                Texture2D _stagingTexture = new Texture2D(device, staging_descriptor, dataRectangle);
                Texture2D _finalTexture = new Texture2D(device, final_descriptor);

                _stagingTexture.Device.ImmediateContext.CopyResource(_stagingTexture, _finalTexture);

My question is two fold:

1. The DataRectangle uses IntPtr type while the pointer retrieved from the interface is Byte array.. Is this not a problem? OR does the pitch member in the DataRectangle address this? For now I casted byteArray to IntPtr.
2. Would this approach work? OR is there a better way to handle this?

Any pointers, suggestions or constructive criticisms would be much appreciated!

Answer 1

a while ago i was looking for the same and I come up with this function that always works fine for my use case

public static Texture2D CreateTexture2DFrombytes(Device device, byte[] RawData, int width, int height)
{
    Texture2DDescription desc;
    desc.Width = width;
    desc.Height = height;
    desc.ArraySize = 1;
    desc.BindFlags = BindFlags.ShaderResource;
    desc.Usage = ResourceUsage.Immutable;
    desc.CpuAccessFlags = CpuAccessFlags.None;
    desc.Format = Format.B8G8R8A8_UNorm;
    desc.MipLevels = 1;
    desc.OptionFlags = ResourceOptionFlags.None;
    desc.SampleDescription.Count = 1;
    desc.SampleDescription.Quality = 0;
    DataStream s = DataStream.Create(RawData, true, true);
    DataRectangle rect = new DataRectangle(s.DataPointer, width * 4);
    Texture2D t2D = new Texture2D(device, desc, rect);
    return t2D;
}