fix assets.parse_model with 'xml' format

src/assets/assetload_funcs.cpp

@@ -381,7 +381,8 @@ assetload::postfunc assetload::model(
 
     auto text = io::read_string(path);
     try {
-        auto model = vcm::parse(path.string(), text).release();
+        auto model = vcm::parse(path.string(), text, path.extension() == ".xml")
+                         .release();
         return [=](Assets* assets) {
             request_textures(loader, *model);
             assets->store(std::unique_ptr<model::Model>(model), name);

src/coders/vcm.cpp

@@ -163,11 +163,11 @@ static std::unique_ptr<model::Model> load_model(const xmlelement& root) {
 }
 
 std::unique_ptr<model::Model> vcm::parse(
-    std::string_view file, std::string_view src
+    std::string_view file, std::string_view src, bool usexml
 ) {
     try {
-        auto doc = io::path(std::string(file)).extension() == ".xml" 
-                    ? xml::parse(file, src) : xml::parse_vcm(file, src, "model");
+        auto doc =
+            usexml ? xml::parse(file, src) : xml::parse_vcm(file, src, "model");
         const auto& root = *doc->getRoot();
         if (root.getTag() != "model") {
             throw std::runtime_error(

src/coders/vcm.hpp

@@ -8,5 +8,7 @@ namespace model {
 }
 
 namespace vcm {
-    std::unique_ptr<model::Model> parse(std::string_view file, std::string_view src);
+    std::unique_ptr<model::Model> parse(
+        std::string_view file, std::string_view src, bool usexml
+    );
 }

src/logic/scripting/lua/libs/libassets.cpp

@@ -55,7 +55,9 @@ static int l_parse_model(lua::State* L) {
     auto name = lua::require_string(L, 3);
     
     if (format == "xml" || format == "vcm") {
-        engine->getAssets()->store(vcm::parse(name, string), name);
+        engine->getAssets()->store(
+            vcm::parse(name, string, format == "xml"), name
+        );
     } else {
         throw std::runtime_error("unknown format " + util::quote(std::string(format)));
     }