2V2-e.4: render 40250 pack terrain with map lighting

formats/asset_resolver.cpp

@@ -144,6 +144,18 @@ bool AssetResolver::build(const std::string& root, const std::vector<std::string
 }
 
 std::string AssetResolver::resolve(const std::string& vp, std::string* reason) const {
+    // The 40250 pack manager already resolves its own virtual paths and patch priority.
+    // Keep the drive prefix: CEterPackManager indexes "d:/ymir work/..." as such.
+    if (assets_root == "pack://") {
+        std::string name = lower(vp);
+        std::replace(name.begin(), name.end(), '\\', '/');
+        if (name.rfind("pack://", 0) == 0) name.erase(0, 7);
+        if (name.empty()) {
+            if (reason) *reason = "empty pack path";
+            return "";
+        }
+        return assets_root + name;
+    }
     auto join = [this](const std::string& rel) {
         if (rel.empty()) return std::string();
         if (assets_root.empty()) return rel;
@@ -224,6 +236,10 @@ bool AssetResolver::load_index(const std::string& root, const std::string& text,
 
 bool AssetResolver::build_or_load(const std::string& root,
                                   const std::vector<std::string>& prio, std::string* err) {
+    if (root == "pack://") {
+        assets_root = root;
+        return true;
+    }
     std::string text;
     if (read_file(root + "/asset_index.txt", text) && text.rfind("MTIDX1", 0) == 0) {
         return load_index(root, text, err);

formats/tests/map_formats_test.cpp

@@ -332,6 +332,11 @@ static void test_asset_resolver_norm() {
     CHECK(AssetResolver::normalize("D:/ymir work/env/./x/../y.tga") == "ymir work/env/y.tga",
           "resolver normalize . and ..");
     CHECK(AssetResolver::normalize("/foo//bar") == "foo/bar", "resolver normalize // and lead /");
+	AssetResolver pack;
+	std::string error;
+	CHECK(pack.build_or_load("pack://", {}, &error), "40250 virtual pack root needs no directory scan");
+	CHECK(pack.resolve("D:\\Ymir Work\\Environment\\A.msenv") ==
+			"pack://d:/ymir work/environment/a.msenv", "pack lookup preserves drive prefix");
 }
 
 static void test_spt_tokens() {