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The overall complexity of virtio-gpu 3D is mostly handled by the Mesa library on the guest side and by virglrenderer on the host side.
VirGL architecture, comparison to other approaches, future directions
An architecture presentation from Collabora (VirGL developers) has been attached below. This outlines the current design and approach taken for VirGL development, the reasons behind these choices, a comparison to other approaches (e.g. direct hardware sharing provided by vendor drivers), and some possible future directions for development of open, vendor-neutral, graphics sharing standards.
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[1] https://en.wikipedia.org/wiki/FourCC
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