OpenGL: Difference between revisions
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OpenGL must break purity due to the need for hardware-specific linkage. Intel, AMD, and Nvidia | {{Merge|Mesa|Most of the content here is related to the mesa package}} | ||
__FORCETOC__ | |||
You can enable OpenGL by setting <code>hardware.graphics.enable = true;</code><ref group=note>Renamed from <code>hardware.opengl.enable</code> in [[NixOS]] 24.11</ref> in your <code>/etc/nixos/configuration.nix</code>. | |||
OpenGL must break purity due to the need for hardware-specific linkage. Intel, AMD, and Nvidia have different drivers for example. On NixOS, these libraries are symlinked under | |||
/run/opengl-driver/lib | /run/opengl-driver/lib | ||
and optionally (if <code>hardware.graphics.enable32Bit</code><ref group=note>Renamed from <code>hardware.opengl.driSupport32Bit</code> in [[NixOS]] 24.11</ref> is enabled) | |||
and | |||
/run/opengl-driver-32/lib | /run/opengl-driver-32/lib | ||
When a program is installed in your environment, these libraries should be found automatically. However, this is not the case in a `nix-shell`. To fix, add this line to your shell.nix: | When a program is installed in your environment, these libraries should be found automatically. However, this is not the case in a `nix-shell`. To fix, add this line to your shell.nix: | ||
<syntaxhighlight lang="nix">LD_LIBRARY_PATH="/run/opengl-driver/lib:/run/opengl-driver-32/lib";</syntaxhighlight> | |||
== Testing Mesa updates == | |||
To avoid a lot of rebuilds there's an internal NixOS option to override the Mesa drivers: <code>hardware.opengl.package</code> | |||
It can be used like this: <syntaxhighlight lang="nix">hardware.opengl.package = (import /srv/nixpkgs-mesa { }).pkgs.mesa.drivers;</syntaxhighlight> | |||
However, since Mesa 21.0.2 this doesn't necessarily work anymore and something like the following might be required: | |||
<syntaxhighlight lang="nix"> | |||
system.replaceRuntimeDependencies = [ | |||
({ original = pkgs.mesa; replacement = (import /srv/nixpkgs-mesa { }).pkgs.mesa; }) | |||
({ original = pkgs.mesa.drivers; replacement = (import /srv/nixpkgs-mesa { }).pkgs.mesa.drivers; }) | |||
]; | |||
</syntaxhighlight> | |||
'''Note:''' Both of these approaches are impure and only work to a certain degree (many limitations!). If you want to use a different version of Mesa your best option is to use an overlay or a Git worktree where you use the same Nixpkgs revision and only alter <code>pkgs/development/libraries/mesa/</code> for one of the two approaches mentioned above. | |||
== Debugging Mesa issues == | |||
There are a lot of useful environment variables for debugging purposes: https://docs.mesa3d.org/envvars.html | |||
The most important one is <code>LIBGL_DEBUG=verbose</code> and helps with debugging error like: | |||
<pre> | |||
libGL error: MESA-LOADER: failed to open $DRIVER (search paths /run/opengl-driver/lib/dri) | |||
libGL error: failed to load driver: $DRIVER | |||
</pre> | |||
=== glxinfo === | |||
Use <code>glxinfo</code> to load 3D acceleration debug information. | |||
If <code>glxinfo</code> returns <code>Error: couldn't find RGB GLX visual or fbconfig</code>, ensure you have <code>hardware.opengl.extraPackages = [ pkgs.mesa.drivers ];</code> set. | |||
== Notes == | |||
<references group=note /> | |||
== Related == | == Related == | ||
[[Nixpkgs with OpenGL on non-NixOS]] | |||
[[Category: Video]] | |||
Latest revision as of 17:21, 27 June 2024
 |
This article or section is a candidate for merging with Mesa.
Notes: Most of the content here is related to the mesa package (Discuss in Talk:OpenGL#)
|
You can enable OpenGL by setting hardware.graphics.enable = true;[note 1] in your /etc/nixos/configuration.nix.
OpenGL must break purity due to the need for hardware-specific linkage. Intel, AMD, and Nvidia have different drivers for example. On NixOS, these libraries are symlinked under
/run/opengl-driver/lib
and optionally (if hardware.graphics.enable32Bit[note 2] is enabled)
/run/opengl-driver-32/lib
When a program is installed in your environment, these libraries should be found automatically. However, this is not the case in a `nix-shell`. To fix, add this line to your shell.nix:
LD_LIBRARY_PATH="/run/opengl-driver/lib:/run/opengl-driver-32/lib";
Testing Mesa updates
To avoid a lot of rebuilds there's an internal NixOS option to override the Mesa drivers: hardware.opengl.package
It can be used like this:
hardware.opengl.package = (import /srv/nixpkgs-mesa { }).pkgs.mesa.drivers;
However, since Mesa 21.0.2 this doesn't necessarily work anymore and something like the following might be required:
system.replaceRuntimeDependencies = [
({ original = pkgs.mesa; replacement = (import /srv/nixpkgs-mesa { }).pkgs.mesa; })
({ original = pkgs.mesa.drivers; replacement = (import /srv/nixpkgs-mesa { }).pkgs.mesa.drivers; })
];
Note: Both of these approaches are impure and only work to a certain degree (many limitations!). If you want to use a different version of Mesa your best option is to use an overlay or a Git worktree where you use the same Nixpkgs revision and only alter pkgs/development/libraries/mesa/ for one of the two approaches mentioned above.
Debugging Mesa issues
There are a lot of useful environment variables for debugging purposes: https://docs.mesa3d.org/envvars.html
The most important one is LIBGL_DEBUG=verbose and helps with debugging error like:
libGL error: MESA-LOADER: failed to open $DRIVER (search paths /run/opengl-driver/lib/dri) libGL error: failed to load driver: $DRIVER
glxinfo
Use glxinfo to load 3D acceleration debug information.
If glxinfo returns Error: couldn't find RGB GLX visual or fbconfig, ensure you have hardware.opengl.extraPackages = [ pkgs.mesa.drivers ]; set.