Frametop: a multi-screen desktop and universal 3D mouse for the Steam Frame

Several KDE Plasma screens floating in SteamVR, each a real monitor of any
resolution and shape, shown by our own compositor (ft-screens), with a
layout, wrist pinning, and visibility modes; a Bluetooth mouse that drives
all of SteamVR as a room-anchored 3D pointer (input relay, ft-pointer
helper, ft_pointer SteamVR driver); two settings apps; and Bluetooth LE
fixes. Installs on the headset with ./install.sh.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

pointer/driver/build.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Build the ft_pointer SteamVR driver on the Frame (dev container) and check it
+# only needs glibc symbols the SteamOS host has (2.39; the container has 2.43).
+# -fno-math-errno keeps sqrtf inline. libm's float functions (sqrtf, atan2f, asinf,
+# remainderf) are versioned GLIBC_2.43 here, so the driver uses the double versions.
+# Usage: pointer/driver/build.sh
+set -euo pipefail
+root=$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)
+"$root/scripts/sync.sh" >/dev/null
+exec "$root/scripts/frame.sh" -C pointer/driver 'set -e
+mkdir -p build
+g++ -std=c++17 -O2 -fPIC -shared -fvisibility=hidden -fno-math-errno -Wall -Wno-unused-parameter \
+  -static-libstdc++ -static-libgcc -Wl,--exclude-libs,ALL \
+  -I/opt/steamvr/tools/hellovr_vulkan_linux/src/openvr/headers \
+  -o build/driver_ft_pointer.so driver_ft_pointer.cpp -lpthread
+max=$(objdump -T build/driver_ft_pointer.so | grep -oE "GLIBC_[0-9.]+" | sort -uV | tail -1)
+echo "built build/driver_ft_pointer.so, newest glibc symbol: $max"
+[ "$(printf "%s\n" "$max" GLIBC_2.39 | sort -V | tail -1)" = GLIBC_2.39 ] || { echo "needs newer glibc than the host has" >&2; exit 1; }'