fix(nix): fixes nix build (#21)

nix/sk_gpu.nix

@@ -0,0 +1,16 @@
+{ stdenv, fetchurl, unzip }:
+
+let
+  sk_gpu_zip = fetchurl {
+    url =
+      "https://github.com/StereoKit/sk_gpu/releases/download/v2024.8.12/sk_gpu.v2024.8.12.zip";
+    sha256 = "sha256-NPjOFzu7AlpQKJ8PZYeUuegrR6TXtRyg+Hm2BxIAMLI=";
+  };
+in stdenv.mkDerivation rec {
+  name = "sk_gpu";
+  src = sk_gpu_zip;
+  unpackPhase = ''
+    unzip -d $out ${sk_gpu_zip}
+  '';
+  nativeBuildInputs = [ unzip ];
+}

nix/stardust-xr-server.nix

@@ -1,19 +1,6 @@
-{ rustPlatform
-, src
-, name
-, openxr-loader
-, libGL
-, mesa
-, xorg
-, fontconfig
-, libxkbcommon
-, libclang
-, cmake
-, cpm-cmake
-, pkg-config
-, llvmPackages
-, meshoptimizer
-}:
+{ rustPlatform, src, name, libGL, mesa, xorg, fontconfig, libxkbcommon, libclang
+, cmake, cpm-cmake, pkg-config, llvmPackages, fetchFromGitHub, sk_gpu, libXau
+, libXdmcp, stdenv, lib }:
 
 rustPlatform.buildRustPackage rec {
   inherit src name;
@@ -21,20 +8,63 @@ rustPlatform.buildRustPackage rec {
     lockFile = (src + "/Cargo.lock");
     allowBuiltinFetchGit = true;
   };
+  FORCE_LOCAL_DEPS = true;
+  CPM_LOCAL_PACKAGES_ONLY = true;
   CPM_SOURCE_CACHE = "./build";
-  postPatch = ''
+  CPM_USE_LOCAL_PACKAGES = true;
+  CPM_DOWNLOAD_ALL = false;
+
+  openxr_loader = fetchFromGitHub {
+    owner = "KhronosGroup";
+    repo = "OpenXR-SDK";
+    rev = "288d3a7ebc1ad959f62d51da75baa3d27438c499";
+    sha256 = "sha256-RdmnBe26hqPmqwCHIJolF6bSmZRmIKVlGF+TXAY35ig=";
+  };
+  meshoptimizer = fetchFromGitHub {
+    owner = "zeux";
+    repo = "meshoptimizer";
+    rev = "c21d3be6ddf627f8ca852ba4b6db9903b0557858";
+    sha256 = "sha256-QCxpM2g8WtYSZHkBzLTJNQ/oHb5j/n9rjaVmZJcCZIA=";
+  };
+  basis_universal = fetchFromGitHub {
+    owner = "BinomialLLC";
+    repo = "basis_universal";
+    rev = "900e40fb5d2502927360fe2f31762bdbb624455f";
+    sha256 = "sha256-zBRAXgG5Fi6+5uPQCI/RCGatY6O4ELuYBoKrPNn4K+8=";
+  };
+
+  DEP_OPENXR_LOADER_SOURCE = "${openxr_loader}";
+  DEP_MESHOPTIMIZER_SOURCE = "${meshoptimizer}";
+  DEP_BASIS_UNIVERSAL_SOURCE = "${basis_universal}";
+
+  postPatch = let libPath = lib.makeLibraryPath [ stdenv.cc.cc.lib ];
+  in ''
     sk=$(echo $cargoDepsCopy/stereokit-rust-*/StereoKit)
     mkdir -p $sk/build/cpm
 
     # This is not ideal, the original approach was to fetch the exact cmake
     # file version that was wanted from GitHub directly, but at least this way it comes from Nixpkgs.. so meh
     cp ${cpm-cmake}/share/cpm/CPM.cmake $sk/build/cpm/CPM_0.38.7.cmake
+    mkdir -p $sk/sk_gpu
+    cp -R ${sk_gpu}/* $sk/sk_gpu
+    chmod -R 755 $sk/sk_gpu/tools/linux_x64/*
+    export DEP_SK_GPU_SOURCE=$sk/sk_gpu
+    export LD_LIBRARY_PATH="${stdenv.cc.cc.lib}/lib";
+                    patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
+                      --set-rpath "${libPath}" \
+                    $sk/sk_gpu/tools/linux_x64/skshaderc
   '';
-  nativeBuildInputs = [
-    cmake pkg-config llvmPackages.libcxxClang
-  ];
+  nativeBuildInputs = [ cmake pkg-config llvmPackages.libcxxClang ];
   buildInputs = [
-    openxr-loader libGL mesa xorg.libX11 fontconfig libxkbcommon meshoptimizer
+    libGL
+    mesa
+    xorg.libX11.dev
+    xorg.libXft
+    xorg.libXfixes
+    fontconfig
+    libxkbcommon
+    libXau
+    libXdmcp
   ];
   LIBCLANG_PATH = "${libclang.lib}/lib";
-}
+}