nix-config-v2/modules/graphics/default.nix

{
  config,
  lib,
  pkgs,
  ...
}:
with lib; let
  cfg = config.graphics;
in {
  options.graphics = {
    gpuVendor = mkOption {
      type = types.enum ["nvidia" "amd" "intel" "none"];
      default = "none";
      description = "GPU vendor to configure graphics drivers for";
    };

    enable = mkEnableOption "graphics configuration";

    wayland = {
      enable = mkEnableOption "Wayland support";

      variableRefreshRate = mkOption {
        type = types.bool;
        default = false;
        description = "Enable variable refresh rate (FreeSync/G-Sync) support";
      };
    };

    vulkan = {
      enable = mkEnableOption "Vulkan support";

      debug = mkOption {
        type = types.bool;
        default = false;
        description = "Enable Vulkan validation layers";
      };
    };
  };

  config = mkIf cfg.enable (mkMerge [
    {
      environment.systemPackages = with pkgs; [
        glxinfo
        vulkan-tools
        mesa-demos
      ];
    }

    (mkIf (cfg.gpuVendor == "nvidia") {
      services.xserver.videoDrivers = ["nvidia"];
      hardware.nvidia = {
        package = config.boot.kernelPackages.nvidiaPackages.stable;
        open = true;
        modesetting.enable = true;
        powerManagement.enable = true;
      };
      environment.systemPackages = with pkgs; [
        nvidia-vaapi-driver
        nvtopPackages.full
      ];
    })

    (mkIf (cfg.gpuVendor == "amd") {
      services.xserver.videoDrivers = ["amdgpu"];
      # hardware.graphics.extraPackages = with pkgs; [
      #   amdvlk
      # ];
      environment.systemPackages = with pkgs; [
        radeontop
      ];
    })

    (mkIf (cfg.gpuVendor == "intel") {
      services.xserver.videoDrivers = ["modesetting"];
      hardware.graphics.extraPackages = with pkgs; [
        intel-media-driver
        intel-compute-runtime
      ];
    })

    (mkIf cfg.wayland.enable {
      programs.xwayland.enable = true;
      environment.sessionVariables = {
        MOZ_ENABLE_WAYLAND = "1";
        QT_QPA_PLATFORM = "wayland";
        SDL_VIDEODRIVER = "wayland";
      };
    })

    (mkIf cfg.vulkan.enable {
      environment.systemPackages = with pkgs;
        [
          vulkan-loader
          vulkan-validation-layers
        ]
        ++ (
          if cfg.vulkan.debug
          then [
            vulkan-tools
          ]
          else []
        );
    })
  ]);
}