[Desktop] Refactor config in smaller files

desktop/default.nix

@@ -0,0 +1,10 @@
+{ config, pkgs, lib, ... }:
+with lib;
+{
+  imports = [
+    ./developer.nix
+    ./multimedia.nix
+    ./plasma.nix
+    ./games.nix
+  ];
+}

desktop/games.nix

@@ -0,0 +1,58 @@
+{ config, pkgs, lib, ... }:
+with lib;
+let
+  cfg = config.aviallon.desktop;
+  generalCfg = config.aviallon.general;
+  mkTmpDir = dirpath: cleanup: "D ${dirpath} 777 root root ${cleanup}";
+in {
+
+  options = {
+    aviallon.desktop.gaming = {
+      enable = mkEnableOption "gaming features";
+    };
+  };
+  
+  config = mkIf cfg.gaming.enable {
+    assertions = [
+      { assertion = cfg.gaming.enable -> cfg.enable; message = "Gaming features requires desktop to be enabled"; }
+    ];
+  
+    environment.systemPackages = with pkgs; [
+      #gamescope
+      mangohud
+    ];
+
+    programs.gamemode = {
+      settings = {
+        general = {
+          renice = 15;
+          softrealtime = "auto";
+        };
+        gpu = {
+          apply_gpu_optimisations = "accept-responsibility";
+          amd_performance_level = "high";
+          nv_powermizer_mode = 1;
+        };
+      };
+      enable = true;
+    };
+
+    programs.steam.enable = !generalCfg.minimal;
+    hardware.steam-hardware.enable = !generalCfg.minimal;
+    programs.steam.remotePlay.openFirewall = true;
+    environment.variables = {
+      "__GL_SHADER_DISK_CACHE" = "true";
+      "__GL_SHADER_DISK_CACHE_SIZE" = "${toString (50 * 1000)}";
+      "__GL_SHADER_DISK_CACHE_SKIP_CLEANUP" = "1"; # Avoid 128mb limit of shader cache
+      "__GL_SHADER_DISK_CACHE_PATH" = cfg.graphics.shaderCache.path + "/nvidia" ;
+      "MESA_SHADER_CACHE_MAX_SIZE" = "50G"; # Put large-enough value. Default is only 1G
+      "MESA_SHADER_CACHE_DIR" = cfg.graphics.shaderCache.path + "/mesa";
+      "MESA_GLSL_CACHE_DIR" = cfg.graphics.shaderCache.path + "/mesa";
+    };
+
+    systemd.tmpfiles.rules = [
+      (mkTmpDir (cfg.graphics.shaderCache.path + "/nvidia") cfg.graphics.shaderCache.cleanupInterval)
+      (mkTmpDir (cfg.graphics.shaderCache.path + "/mesa") cfg.graphics.shaderCache.cleanupInterval)
+    ];
+  };
+}

desktop/multimedia.nix

@@ -0,0 +1,15 @@
+{ config, lib, pkgs, ... }:
+with lib;
+let
+  cfg = config.aviallon.desktop;
+in {
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      ffmpeg-full
+      krita
+      obs-studio
+      scribus
+      yt-dlp
+    ];
+  };
+}