godot: Nix build fails to detect vulkan (or any video backend)

Godot version

4.0.dev(f00803b)

System information

NIXOS, nvidia 1650 Max-q

Issue description

Nix build of godot (using this flake) fails to start and gives this error message:

Godot Engine v4.0.alpha.custom_build - https://godotengine.org
ERROR: Could not initialize Vulkan
   at: DisplayServerX11 (platform/linuxbsd/display_server_x11.cpp:4744)
Your video card driver does not support any of the supported Vulkan or OpenGL versions.
Please update your drivers or if you have a very old or integrated GPU, upgrade it.
If you have updated your graphics drivers recently, try rebooting.
ERROR: Unable to create DisplayServer, all display drivers failed.
   at: setup2 (main/main.cpp:1715)
ERROR: BUG: Unreferenced static string to 0: interface_added
   at: unref (core/string/string_name.cpp:131)

I have verified that vulkan is functioning correctly: vkcube works without a hitch
opengl is also available and functioning

How does godot detect the video driver? Nix uses non-standard paths for executables, so if godot is scanning for some hardcoded directory, that may be the culprit.

Any Ideas?

Steps to reproduce

This is easily reproduced using this nix flake. Make sure that opengl and vulkan are enabled using the following configuration.nix snippet:

hardware.opengl.enable = true;                                                                     
hardware.opengl.driSupport = true;
environment.systemPackages = with pkgs; [glxinfo vulkan-tools];

Minimal reproduction project

No response

About this issue

Original URL
State: closed
Created 2 years ago
Reactions: 1
Comments: 18 (16 by maintainers)

Most upvoted comments

nixpkgs currently package beta 10 https://github.com/NixOS/nixpkgs/pull/208160

and newly there is PR open for update to beta 14 https://github.com/NixOS/nixpkgs/pull/212156 So I would recommend all nixos user use version from nixpkgs.

turboMaCk on Jan 23, 2023

Most buildsystems nowadays call g++ or clang++ directly for the linking step, and the compilers call the relevant linker internally. To pass this kind of linker options you should use -Wl,-rpath=....

akien-mga on Jul 21, 2022

Patches are very common across nixpkgs, and you don’t have to update them all that often.

How do I do this?

It seems that we can pass linker arguments via the scons LINKFLAGS argument. Something like this:

sconsFlags = "platform=linuxbsd LINKFLAGS='-rpath=${vulkan-loader}/lib -rpath=${alsa-lib}/lib -rpath=${libpulseaudio}/lib'";

There appears be an issue with incorrect escaping in the scons builder though

jgillich on Jul 21, 2022