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Decode PQ/BT.2020 desktop pixels into an FP16 linear scRGB target before compositing the color cursor, ImGui, damage overlay, and letterboxing. Encode the damaged result to PQ once at the surface boundary. Keep logical AND/XOR cursor masks in the encoded domain. This preserves premultiplied cursor edges, prevents encoded-domain blending, uses the Wayland output reference white for local overlays, and keeps guest cursor white and display calibration independent from frame SDR white. It also corrects HDR-to-SDR absolute luminance scaling, gamut matrices, black handling, and buffer-age repair for the extra pass. Suppress overlays when their conversion framebuffer is unavailable rather than allowing unconverted sRGB draws into an HDR target. Use named transfer constants for cursor shader state. Convert clipped surface rectangles explicitly before using the frame-damage merge helper, which avoids mixing its unsigned type with the EGL surface rectangle type. Only advertise native PQ when the FP16 composition target is available. SDR and native scRGB retain their direct single-pass paths.
Looking Glass
An extremely low latency KVMFR (KVM FrameRelay) implementation for guests with VGA PCI Passthrough.
- Project Website: https://looking-glass.io
- Documentation: https://looking-glass.io/docs
Documentation
❕❕❕ IMPORTANT ❕❕❕
This project contains submodules that must be checked out if building from the git repository! If you are not a developer and just want to compile Looking Glass, please download the source archive from the website instead:
https://looking-glass.io/downloads
Source code for the documentation can be found in the /doc directory.
You may view this locally as HTML by running make html with python3-sphinx
and python3-sphinx-rtd-theme installed.