Looking Glass is an open source application that allows the use of a KVM (Kernel-based Virtual Machine) configured for VGA PCI Pass-through without an attached physical monitor, keyboard or mouse. This is the final step required to move away from dual booting with other operating systems for legacy programs that require high performance graphics.

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Unlike network based streaming applications, Looking Glass does not use any form of compression or color space conversion, all frames are transferred to the viewer (client application) in 32-bit RGBA without any transformations or modifications. This is possible through the use of a shared memory segment which enables extremely high throughput low latency guest to host communication.

Figure 1: Colors appear accurately on screen.


Host Requirements

Anything recent graphics device that supports OpenGL should do fine, the client application does not perform any heavy graphical work.

Guest Requirements

At this time only Windows 10 is supported with any video card supporting DXGI Desktop Duplication or the NVIDIA Capture API (NB: NvFBC requires a professional card such as Quadro).


Looking Glass has been released under the GPL 2.0 license by Geoffrey McRae of HostFission