Add rpcs3 (PS3 emulator) to steam deck.

nix/steam_deck/configuration/home.nix

@@ -10,6 +10,7 @@
     ./roles/2ship2harkinian
     ./roles/graphics
     ./roles/pcsx2
+    ./roles/rpcs3
     ./roles/shipwright
     ./roles/sm64ex
     ./roles/steam_rom_manager

nix/steam_deck/configuration/hosts/deck/default.nix

@@ -11,6 +11,7 @@
   config = {
     me.graphical = true;
     me.pcsx2.enable = true;
+    me.rpcs3.enable = true;
     me.ship2harkinian.enable = true;
     me.shipwright.enable = true;
     me.sm64ex.enable = true;

nix/steam_deck/configuration/roles/rpcs3/default.nix

@@ -0,0 +1,94 @@
+# MANUAL: mkdir -p ~/.state/.cache/rpcs3 ~/.persist/.config/rpcs3/dev_hdd0 ~/.persist/.config/rpcs3/dev_hdd1 ~/.persist/.config/rpcs3/savestates ~/.persist/.config/rpcs3/dev_usb000 ~/.persist/.config/rpcs3/dev_flash
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  steam_rpcs3 = pkgs.writeScriptBin "steam_rpcs3" ''
+    export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${pkgs.libglvnd}/lib"
+    exec ${pkgs.rpcs3}/bin/rpcs3
+  '';
+in
+{
+  imports = [ ];
+
+  options.me = {
+    rpcs3.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install rpcs3.";
+    };
+  };
+
+  config = lib.mkIf config.me.rpcs3.enable (
+    lib.mkMerge [
+      (lib.mkIf config.me.graphical {
+        home.packages = with pkgs; [
+          rpcs3
+          steam_rpcs3
+        ];
+
+        # .config/rpcs3/config.yml
+        # .config/rpcs3/GuiConfigs/CurrentSettings.ini
+
+        home.persistence."/home/deck/.persist" = {
+          directories = [
+            {
+              directory = ".config/rpcs3/dev_hdd0";
+              method = "symlink";
+            }
+            {
+              directory = ".config/rpcs3/dev_hdd1";
+              method = "symlink";
+            }
+            {
+              directory = ".config/rpcs3/savestates";
+              method = "symlink";
+            }
+            {
+              directory = ".config/rpcs3/dev_usb000";
+              method = "symlink";
+            }
+            {
+              # Seems to be where the firmware is installed.
+              directory = ".config/rpcs3/dev_flash";
+              method = "symlink";
+            }
+          ];
+        };
+        home.persistence."/home/deck/.state" = {
+          directories = [
+            {
+              directory = ".cache/rpcs3";
+              method = "symlink";
+            }
+          ];
+        };
+
+        nixpkgs.overlays = [
+          (final: prev: {
+            rpcs3 = pkgs.buildEnv {
+              name = prev.rpcs3.name;
+              paths = [
+                (config.lib.nixGL.wrap prev.rpcs3)
+              ];
+              extraOutputsToInstall = [
+                "man"
+                "doc"
+                "info"
+              ];
+              # We have to use 555 instead of the normal 444 here because the .desktop file ends up inside $HOME on steam deck and desktop files must be either not in $HOME or must be executable, otherwise KDE Plasma refuses to execute them.
+              # postBuild = ''
+              #   chmod 0555 $out/share/applications/PCSX2.desktop
+              # '';
+            };
+          })
+        ];
+      })
+    ]
+  );
+}