Tweaked the package

package.nix

@@ -1,6 +1,7 @@
 { lib
 , stdenv
 , fetchFromGitHub
+, fetchgit
 , cmake
 , ninja
 , pkg-config
@@ -8,6 +9,7 @@
 , glm
 , vulkan-headers
 , vulkan-loader
+, vulkan-utility-libraries
 , vulkan-memory-allocator
 , vk-bootstrap
 , fmt
@@ -18,30 +20,37 @@
 }:
 
 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 = builtins.path {
-    path = ./.;
-    name = "vulkan-engine-source";
-    filter = path: type:
-      let base = baseNameOf path;
-      in !(builtins.elem base [
-        ".git"
-        ".direnv"
-        "build"
-        "result"
-        "result-bundle"
-        "_deps"
-      ]);
-  };
+  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
@@ -56,6 +65,7 @@ stdenv.mkDerivation {
     glm
     vulkan-headers
     vulkan-loader
+    vulkan-utility-libraries
     vk-bootstrap
     vulkan-memory-allocator
     fmt
@@ -72,12 +82,29 @@ stdenv.mkDerivation {
 
   installPhase = ''
     runHook preInstall
+
     mkdir -p $out/bin
-    cp build/engine/engine $out/bin/engine
-    cp build/server/server $out/bin/server
-    if [ -d build/engine/shaders ]; then
-      cp -r build/engine/shaders $out/bin/shaders
+
+    # 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
   '';