nixos-config/modules/common/hardware.nix

{ lib, config, pkgs, ... }:
with lib;
{
  options.hwAccelerationGPU = mkOption {
    type = types.nullOr (types.enum [ "nvidia" "intel" ]);
    default = null;
    example = "nvidia";
    description = ''
      The GPU type.
    '';
  };

  config = {
    boot.kernelParams = mkIf (config.hwAccelerationGPU == "intel") [
      "i915.enable_guc=2"
    ];

    hardware.opengl = {
      enable = config.hwAccelerationGPU != null;
      extraPackages = with pkgs; [
        (mkIf (config.hwAccelerationGPU == "intel") intel-media-driver)
        (mkIf (config.hwAccelerationGPU == "intel") intel-compute-runtime)
        (mkIf (config.hwAccelerationGPU == "nvidia") libvdpau-va-gl)
        (mkIf (config.hwAccelerationGPU == "nvidia") vaapiVdpau)
      ];
    };

    services.xserver.videoDrivers = [
      (mkIf (config.hwAccelerationGPU == "nvidia") "nouveau")
    ];
  };
}