OpenGL: Difference between revisions

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imported>Primeos
Document how to test Mesa updates (this comes up pretty often)
imported>Primeos
m Minor improvements
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OpenGL must break purity due to the need for hardware-specific linkage. Intel, AMD, and Nvidia will have different libraries for example. On NixOS, these libraries are mounted at
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.opengl.driSupport32Bit</code> is enabled)
and
   /run/opengl-driver-32/lib
   /run/opengl-driver-32/lib



Revision as of 21:10, 24 May 2021

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.opengl.driSupport32Bit 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; })
];

Related

https://nixos.wiki/wiki/Nixpkgs_with_OpenGL_on_non-NixOS