machine_setup/nix/configuration/roles/graphics/default.nix

{
  config,
  lib,
  pkgs,
  ...
}:

{
  imports = [ ];

  options.me.graphics_card_type = lib.mkOption {
    type = lib.types.nullOr (
      lib.types.enum [
        "amd"
        "intel"
        "nvidia"
      ]
    );
    default = null;
    example = "amd";
    description = "What graphics card type is in the computer.";
  };

  options.me.graphical = lib.mkOption {
    type = lib.types.bool;
    default = false;
    example = true;
    description = "Whether we want to install graphical programs.";
  };

  config = (
    lib.mkMerge [
      (lib.mkIf config.me.graphical {
        environment.systemPackages = with pkgs; [
          mesa-demos # for glxgears
          vulkan-tools # for vkcube
          xorg.xeyes # to test which windows are using x11
        ];
        hardware.graphics.enable = true;
      })
    ]
  );
}