Add shell.nix

shell.nix

@@ -0,0 +1,15 @@
+with import <nixpkgs> { };
+let
+  dlopen-libs = with xorg; [ vulkan-loader libX11 libXcursor libXrandr libXi ];
+in mkShell {
+  nativeBuildInputs = with pkgs; [ rustChannels.stable.rust pkg-config zstd protobuf ];
+  shellHook = ''
+    export RUST_BACKTRACE=1
+    export ZSTD_SYS_USE_PKG_CONFIG=1
+    export SHADERC_LIB_DIR="${shaderc.static}/lib"
+    export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${lib.makeLibraryPath dlopen-libs}"
+    #export VK_INSTANCE_LAYERS=VK_LAYER_KHRONOS_validation
+    export XDG_DATA_DIRS="$XDG_DATA_DIRS:${vulkan-validation-layers}/share"
+    export RUST_LOG=client=trace,server=trace,common=trace,vulkan=info
+  '';
+}