Add shell.nix

shell.nix

@@ -0,0 +1,33 @@
+let
+  pkgs = import <nixpkgs> {};
+
+  log_level = "info";
+in
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    rustc cargo rustfmt rust-analyzer cargo-outdated clippy
+
+    # Needed by cargo dependencies.
+    cmake gcc zlib pkgconfig openssl
+
+    # wgpu graphics dependencies
+    vulkan-loader vulkan-tools
+    xorg.libXcursor xorg.libXi xorg.libXrandr
+
+    # Linker
+    lld
+
+    cargo-outdated
+  ];
+
+  shellHook = ''
+    # Dynamic linking for Vulkan stuff for wgpu graphics
+    export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${
+      with pkgs; pkgs.lib.makeLibraryPath [ vulkan-loader openssl zlib ]
+    }"
+  '';
+
+  RUST_BACKTRACE = "1";
+  RUSTFLAGS = "-C link-arg=-fuse-ld=lld";
+  RUST_LOG = "calx-ecs=${log_level},vitral=${log_level},calx=${log_level},display=${log_level},world=${log_level},magog=${log_level}";
+}