fix(flake.nix): graphics libs

flake.nix

@@ -13,19 +13,29 @@
   }:
     flake-utils.lib.eachDefaultSystem (system: let
       pkgs = nixpkgs.legacyPackages.${system};
-      # release binaries have the curseforge key compiled in; source builds
-      # don't, so forward the caller's key when building impurely.
       curseforgeApiKey = builtins.getEnv "CURSEFORGE_API_KEY";
-      # minecraft's bundled lwjgl natives dlopen the host's x11 stack, which
-      # isn't on the default loader path on nixos. java is spawned as a child
-      # of rmcl, so a wrapper LD_LIBRARY_PATH propagates all the way down.
-      runtimeLibs = pkgs.lib.makeLibraryPath (with pkgs; [
-        libX11
-        libXext
-        libXcursor
-        libXrandr
-        libXxf86vm
-      ]);
+      # minecraft's lwjgl/sdl natives dlopen the host's x11, opengl, vulkan,
+      # input and audio stack, which isn't on the default loader path on nixos.
+      # java is spawned as a child of rmcl, so a wrapper LD_LIBRARY_PATH
+      # propagates all the way down. /run/opengl-driver/lib holds the mesa
+      # drivers that libglvnd dispatches to.
+      runtimeLibs =
+        pkgs.lib.makeLibraryPath (with pkgs; [
+          libX11
+          libXext
+          libXcursor
+          libXrandr
+          libXxf86vm
+          libXi
+          libXinerama
+          libGL
+          vulkan-loader
+          libxkbcommon
+          udev
+          alsa-lib
+          libpulseaudio
+        ])
+        + ":/run/opengl-driver/lib";
     in {
       packages.default = pkgs.rustPlatform.buildRustPackage {
         pname = "rmcl";
@@ -50,5 +60,15 @@
           mainProgram = "rmcl";
         };
       };
+
+      # `nix develop` + `cargo run --release` spawns java directly, bypassing
+      # the wrapper above, so expose the same runtime libs in the dev shell.
+      devShells.default = pkgs.mkShell {
+        packages = with pkgs; [cargo rustc rustfmt clippy jdk pkg-config];
+        buildInputs = [pkgs.libxcb];
+        shellHook = ''
+          export LD_LIBRARY_PATH="${runtimeLibs}:$LD_LIBRARY_PATH"
+        '';
+      };
     });
 }