Fix NixOS not running

.envrc

@@ -1 +1 @@
-use flake
+use flake --impure

flake.nix

@@ -30,36 +30,34 @@
           cargo = rust;
         });
 
+        buildInputs = with pkgs; [ vulkan-headers vulkan-loader vulkan-validation-layers ]
+          ++ pkgs.lib.optionals pkgs.stdenv.hostPlatform.isLinux (with pkgs; [ libxkbcommon wayland libGL ])
+          ++ pkgs.lib.optionals pkgs.stdenv.hostPlatform.isDarwin (with pkgs; [ darwin.apple_sdk.frameworks.SystemConfiguration ]);
+
         nativeBuildInputs = with pkgs; [
-          (rust.override { extensions = ["rust-src" "rust-analyzer"]; })
           pkg-config
           cmake
           python312
         ];
 
-        libs = with pkgs; [ vulkan-headers vulkan-loader vulkan-validation-layers ]
+        mkRustVulkanShell = { nixGLSupport ? true }: pkgs.mkShell {
-          ++ pkgs.lib.optionals pkgs.stdenv.hostPlatform.isLinux (with pkgs; [ libxkbcommon wayland libGL ])
+          nativeBuildInputs = with pkgs; [
-          ++ pkgs.lib.optionals pkgs.stdenv.hostPlatform.isDarwin (with pkgs; [ darwin.apple_sdk.frameworks.SystemConfiguration ]);
+           (rust.override { extensions = ["rust-src" "rust-analyzer"]; })
+          ] ++ nativeBuildInputs;
+
+          buildInputs = buildInputs
+            ++ pkgs.lib.optionals nixGLSupport [ pkgs.nixgl.auto.nixVulkanNvidia pkgs.nixgl.nixVulkanIntel ];
+
+          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath buildInputs;
+          VK_LAYER_PATH = "${pkgs.vulkan-validation-layers}/share/vulkan/explicit_layer.d";
+        };
       in
       {
         devShells = {
-          default = pkgs.mkShell {
+          default = mkRustVulkanShell  {};
-            inherit nativeBuildInputs;
 
-            buildInputs = libs;
+          # Crash with error: cannot coerce null to a string: null
-
+          nixos = mkRustVulkanShell { nixGLSupport = false; };
-            LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath (with pkgs; [ libxkbcommon wayland libGL ]);
-          };
-
-          with_compatibility = pkgs.mkShell {
-            inherit nativeBuildInputs;
-
-            buildInputs = libs ++ [
-              pkgs.nixgl.auto.nixVulkanNvidia pkgs.nixgl.nixVulkanIntel
-            ];
-
-            LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath (with pkgs; [ libxkbcommon wayland libGL ]);
-          };
         };
 
         packages = {
@@ -69,8 +67,7 @@
 
             src = self;
 
-            nativeBuildInputs = with pkgs; [ pkg-config shaderc ];
+            inherit nativeBuildInputs buildInputs;
-            buildInputs = libs;
 
             cargoLock = {
               lockFile = ./Cargo.lock;

src/renderer/app.rs

@@ -52,8 +52,6 @@ impl App {
                 enabled_extensions: required_extensions,
                 enabled_layers: vec![
                     String::from("VK_LAYER_KHRONOS_validation"),
-                    String::from("VK_LAYER_MANGOHUD_overlay_x86_64"),
-                    String::from("VK_LAYER_NV_optimus"),
                 ],
                 ..Default::default()
             },