nixcfg/nixosModules/desktop/gnome/tripleBuffering.nix

{
  pkgs,
  lib,
  config,
  ...
}: {
  options = {
    desktopConfig.desktopEnvironments.gnome.tripleBuffering.enable =
      lib.mkEnableOption "Enables dynamic triple buffering for GNOME.";
  };

  config =
    lib.mkIf
    config.desktopConfig.desktopEnvironments.gnome.tripleBuffering.enable {
      nixpkgs.overlays = [
        (final: prev: {
          gnome = prev.gnome.overrideScope (gnomeFinal: gnomePrev: {
            mutter = gnomePrev.mutter.overrideAttrs (old: {
              src = pkgs.fetchgit {
                url = "https://gitlab.gnome.org/vanvugt/mutter.git";
                # GNOME 45: triple-buffering-v4-45
                rev = "0b896518b2028d9c4d6ea44806d093fd33793689";
                sha256 = "sha256-mzNy5GPlB2qkI2KEAErJQzO//uo8yO0kPQUwvGDwR4w=";
              };
            });
          });
        })
      ];
    };
}