FreeVGUI 0.1 (Happy birthday, Team Fortress!)

The first tagged release of FreeVGUI -- a free and open source reimplementation of Half-Life 1's VGUI1 toolkit (vgui.so/vgui.dll), written to be binary-compatible with the original.

Thirty years ago today, Team Fortress was released for Quake. I didn't knew it's TF's anniversary today but I guess today is a good day for FreeVGUI release, if we keep in mind that VGUI1 because of Team Fortress Classic. :)

Highlights

• Complete VGUI1 widgets set implementation.
• 100% ABI compatible with Linux vgui.so, checked with libabigail and vtable-dumper.
• Licensed under BSD 3-clause, so it can be freely used by both Xash3D FWGS or pure GoldSrc mods.
• Crossplatform already, tested to work on both amd64 and riscv64.

Xash3D FWGS support layer

• platform/xash3d-fwgs/ is a full replacement for the engine's vgui_support shim, built as part of the library instead of as a separate module.
• Ships as either dynamic DLL for GoldSrc compatible platforms (32-bit x86 Windows, Linux or Mac) or statically linked into the client.dll on other platforms to avoid C++ ABI between engine and game logic.

Known limitations

• Only the POSIX platform layer exists so far, win32 support will come later.
• Build mode is incomplete.

Credits

• @nagist for https://github.com/nagist/vgui_dll as main input for the specification that this code was written against.