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fix(nix): let EGL find NixOS GPU drivers in the FHS environment

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NixOS keeps the GPU driver's EGL vendor files and external-platform files
under /run/opengl-driver, which glvnd and NVIDIA's driver inside the FHS
environment do not search. glvnd then only knows Mesa, and NVIDIA cannot open
X11 displays because its X11 support is the egl-x11 external platform. The
client fell back to Mesa's software rasterizer: garbled text in the client and
no way to present the game's NVIDIA Vulkan frames.

When /run/opengl-driver provides them, prepend those directories to
__EGL_VENDOR_LIBRARY_DIRS and __EGL_EXTERNAL_PLATFORM_CONFIG_DIRS, keeping the
FHS paths and any caller-provided value after them.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
This commit is contained in:
David GhegheaandClaude Opus 5.5 committed 2026-10-18 15:47:45 +02:00
1 parent c943a19606
commit 6a6c2d0a1b
1 file changed
+12
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flake.nix
+12
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@@ -160,6 +160,18 @@
export PKG_CONFIG_PATH="/usr/local/lib/pkgconfig:/usr/local/share/pkgconfig:/usr/lib/pkgconfig:/usr/lib64/pkgconfig:/usr/share/pkgconfig:''${PKG_CONFIG_PATH:-}"
export CMAKE_PREFIX_PATH="/usr/local:/usr:/usr/lib/cmake/llvm:''${CMAKE_PREFIX_PATH:-}"
unset NIX_LDFLAGS NIX_CFLAGS_COMPILE NIX_HARDENING_ENABLE CPATH LIBRARY_PATH
# NixOS keeps the GPU driver's EGL vendor and external-platform files under
# /run/opengl-driver, which glvnd and NVIDIA's driver in this FHS environment
# do not search. Without them glvnd only finds Mesa, and NVIDIA cannot open
# X11 displays (its X11 support is the egl-x11 external platform): the
# client renders with Mesa's software rasterizer, which garbles text and
# cannot present the game's NVIDIA Vulkan frames. FHS paths stay as fallback.
if [ -d /run/opengl-driver/share/glvnd/egl_vendor.d ]; then
export __EGL_VENDOR_LIBRARY_DIRS="/run/opengl-driver/share/glvnd/egl_vendor.d:/etc/glvnd/egl_vendor.d:/usr/share/glvnd/egl_vendor.d''${__EGL_VENDOR_LIBRARY_DIRS:+:$__EGL_VENDOR_LIBRARY_DIRS}"
fi
if [ -d /run/opengl-driver/share/egl/egl_external_platform.d ]; then
export __EGL_EXTERNAL_PLATFORM_CONFIG_DIRS="/run/opengl-driver/share/egl/egl_external_platform.d:/etc/egl/egl_external_platform.d:/usr/share/egl/egl_external_platform.d''${__EGL_EXTERNAL_PLATFORM_CONFIG_DIRS:+:$__EGL_EXTERNAL_PLATFORM_CONFIG_DIRS}"
fi
'';
runScript = pkgs.writeShellScript "darling-lol-run" ''