feat: support alternative vcm models syntax

src/assets/assetload_funcs.cpp

@@ -352,21 +352,35 @@ assetload::postfunc assetload::model(
             throw;
         }
     }
-    path = paths.find(file + ".xml");
-    if (io::exists(path)) {
-        auto text = io::read_string(path);
-        try {
-            auto model = vcm::parse(path.string(), text).release();
-            return [=](Assets* assets) {
-                request_textures(loader, *model);
-                assets->store(std::unique_ptr<model::Model>(model), name);
-            };
-        } catch (const parsing_error& err) {
-            std::cerr << err.errorLog() << std::endl;
-            throw;
+
+    std::array<std::string, 2> extensions {
+        ".xml",
+        ".vcm"
+    };
+
+    path = "";
+    for (const auto& ext : extensions) {
+        auto newPath = paths.find(file + ext);
+        if (io::exists(newPath)) {
+            path = std::move(newPath);
+            break;
         }
     }
-    throw std::runtime_error("could not to find model " + util::quote(file));
+    if (path.empty()) {
+        throw std::runtime_error("could not to find model " + util::quote(file));
+    }
+
+    auto text = io::read_string(path);
+    try {
+        auto model = vcm::parse(path.string(), text).release();
+        return [=](Assets* assets) {
+            request_textures(loader, *model);
+            assets->store(std::unique_ptr<model::Model>(model), name);
+        };
+    } catch (const parsing_error& err) {
+        std::cerr << err.errorLog() << std::endl;
+        throw;
+    }
 }
 
 static void read_anim_file(