desktop-duplication-sample

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DXGI/DX11 Desktop Duplication test library for Unity C# integration

Demo: https://www.youtube.com/watch?v=FftSRGpxCAw

API:

• grabber_create
• grabber_get_dest_tex Returns a ID3D11ShaderResourceView that contains the screen contents.
• grabber_get_next_frame Updates the shader resource view texture with the current screen contents
• grabber_destroy
• grabber_get_width
• grabber_get_height

This should be taken as an example only. It would probably be best to create a new project using this code as a reference.

Hacks/Issues:

• grabber_create takes a pointer to an existing texture which is used to get the ID3D11Device by calling GetDevice. There should be a native Unity API way to do this. Notably, the texture won't display if it was created using a different ID3D11Device than Unity is using.
• Doesn't handle the mouse cursor or take advantage of dirty/copy rects. CopyResource is used to copy the whole frame. Performance seems fine despite this though, since it should all take place on the GPU.
• Errors aren't returned through the public API. I didn't know the C# marshalling interface well enough to implement output parameters.
• grabber_get_next_frame takes a texture pointer which is not used. Leftover from old experiment.
• grabber_get_next_frame should be hooked into the rendering thread instead of being called from C#.
• Everything assumes DX11 is the rendering backend for Unity. This should be queried at runtime.