Tweaked the package

CMakeLists.txt

@@ -24,6 +24,7 @@ endif()
 find_package( glfw3 REQUIRED )
 find_package( glm REQUIRED )
 find_package( VulkanMemoryAllocator CONFIG REQUIRED )
+find_package( vk-bootstrap REQUIRED )
 find_package( fmt REQUIRED )
 find_package( CLI11 REQUIRED )
 # Shader compilers
@@ -42,9 +43,6 @@ set_property (
 
 find_program(SLANGC_EXECUTABLE slangc HINTS $ENV{VULKAN_SDK}/bin REQUIRED)
 
-# CL11
-#add_subdirectory(include/CLI11)
-
 # fastgltf because it's not in nixpkgs
 
 FetchContent_Declare(
@@ -54,14 +52,6 @@ FetchContent_Declare(
 )
 FetchContent_MakeAvailable(fastgltf)
 
-# vk-bootstrap because CMAKE can't find it on NixOS
-FetchContent_Declare(
-  vk-bootstrap
-  GIT_REPOSITORY https://github.com/charles-lunarg/vk-bootstrap.git
-  GIT_TAG v1.3.295
-)
-FetchContent_MakeAvailable(vk-bootstrap)
-
 # Helper functions to build shaders
 function(addGlslShader SOURCE OUTPUT_DIR)
   get_filename_component(SHADER_NAME ${SOURCE} NAME_WE)

flake.nix

@@ -45,6 +45,7 @@
             sdl3
             fmt
             cli11
+            simdjson
             #imgui
             tinyobjloader
             nlohmann_json
@@ -81,5 +82,8 @@
             echo $LD_LIBRARY_PATH
           '';
         };
+
+        packages.engine = pkgs.callPackage ./package.nix { };
+        packages.default = self.packages.${system}.engine;
       });
 }

package.nix

@@ -0,0 +1,112 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, fetchgit
+, cmake
+, ninja
+, pkg-config
+, glfw3
+, glm
+, vulkan-headers
+, vulkan-loader
+, vulkan-utility-libraries
+, vulkan-memory-allocator
+, vk-bootstrap
+, fmt
+, cli11
+, glslang
+, shader-slang
+, simdjson
+}:
+
+let
+  fs = lib.fileset;
+  fastgltf = fetchFromGitHub {
+    owner = "spnda";
+    repo = "fastgltf";
+    rev = "v0.8.0";
+    hash = "sha256-nPkVMrve1+04XRpSswBqjlSurliCFBRxR8Zxy4xZ5pE=";
+  };
+  imgui = fetchgit {
+      url = "https://git.alexdelcamp.fr/Alexandre_1a/imgui.git";
+      rev = "d7cce3ad5070bbdbbd7a39335c0c1e90071211d0";
+      hash = "sha256-2v085YFc17aj96YlOc4Fp8sJUHUmjRU8X54FnuqKrgc=";
+  };
+in
+stdenv.mkDerivation {
+  pname = "vulkan-engine";
+  version = "0.1.0";
+  src = ./.;
+
+  postUnpack = ''
+      # include/ peut ne pas exister du tout dans la copie flake
+      # (cas de figure ici), donc on le crée.
+      mkdir -p $sourceRoot/include
+
+      # On remplace les dossiers vides (ou absents) par les vraies sources
+      rm -rf $sourceRoot/include/imgui $sourceRoot/include/CLI11
+      cp -r ${imgui}             $sourceRoot/include/imgui
+
+      # Autorise le write sur l'arbre : CMake va générer des fichiers
+      chmod -R u+w $sourceRoot
+    '';
+
+
+  nativeBuildInputs = [
+    cmake
+    ninja
+    pkg-config
+    glslang
+    shader-slang
+  ];
+
+  buildInputs = [
+    glfw3
+    glm
+    vulkan-headers
+    vulkan-loader
+    vulkan-utility-libraries
+    vk-bootstrap
+    vulkan-memory-allocator
+    fmt
+    cli11
+    simdjson
+  ];
+
+  cmakeFlags = [
+    "-DCMAKE_BUILD_TYPE=Release"
+    "-DCMAKE_EXPORT_COMPILE_COMMANDS=ON"
+    "-DFETCHCONTENT_SOURCE_DIR_FASTGLTF=${fastgltf}"
+    "-DFETCHCONTENT_FULLY_DISCONNECTED=ON"
+  ];
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/bin
+
+    # Les binaires sont relatifs au répertoire de build (cwd = $sourceRoot/build)
+    cp engine/engine $out/bin/engine
+    cp server/server $out/bin/server
+
+    # Shaders compilés (glslang/slang) — générés dans engine/shaders
+    if [ -d engine/shaders ]; then
+      cp -r engine/shaders $out/bin/shaders
+    fi
+
+    # Assets copiés par addBinary() : modèles et textures
+    if [ -d engine/models ]; then
+      cp -r engine/models $out/bin/models
+    fi
+    if [ -d engine/textures ]; then
+      cp -r engine/textures $out/bin/textures
+    fi
+
+    # Fichiers annexes produits au runtime / par addBinary
+    [ -f engine/LICENSE ] && cp engine/LICENSE $out/bin/LICENSE
+
+    runHook postInstall
+  '';
+
+  meta.mainProgram = "engine";
+}