refactor(rendering): formalize pipeline selection and engine asset discovery

engine/include/XCEngine/Scripting/Mono/MonoScriptRuntime.h

@@ -34,6 +34,11 @@ class MonoManagedRenderPipelineStageRecorder;
 
 class MonoScriptRuntime : public IScriptRuntime {
 public:
+    struct ManagedAssemblyDescriptor {
+        std::string name;
+        std::filesystem::path path;
+    };
+
     struct Settings {
         std::filesystem::path assemblyDirectory;
         std::filesystem::path corlibDirectory;
@@ -41,6 +46,7 @@ public:
         std::filesystem::path appAssemblyPath;
         std::string coreAssemblyName = "XCEngine.ScriptCore";
         std::string appAssemblyName = "GameScripts";
+        std::vector<ManagedAssemblyDescriptor> engineAssemblies;
         std::string baseNamespace = "XCEngine";
         std::string baseClassName = "MonoBehaviour";
     };
@@ -179,6 +185,11 @@ private:
         uint32_t gcHandle = 0;
     };
 
+    struct LoadedManagedAssemblyData {
+        MonoAssembly* assembly = nullptr;
+        MonoImage* image = nullptr;
+    };
+
     void ResolveSettings();
     bool InitializeRootDomain();
     bool CreateAppDomain();
@@ -186,6 +197,11 @@ private:
     void SetCurrentDomain() const;
 
     bool LoadAssemblies();
+    bool LoadAssemblyImage(
+        const ManagedAssemblyDescriptor& descriptor,
+        const char* roleLabel,
+        MonoAssembly*& outAssembly,
+        MonoImage*& outImage);
     bool DiscoverScriptClasses();
     void DiscoverScriptClassesInImage(const std::string& assemblyName, MonoImage* image);
     void DiscoverRenderPipelineAssetClassesInImage(
@@ -223,6 +239,7 @@ private:
     void ClearManagedInstances();
     void ClearExternalManagedObjects();
     void ClearClassCache();
+    MonoImage* FindLoadedAssemblyImage(const std::string& assemblyName) const;
     bool ResolveManagedClass(
         const std::string& assemblyName,
         const std::string& namespaceName,
@@ -296,6 +313,8 @@ private:
 
     std::unordered_map<std::string, ClassMetadata> m_classes;
     std::vector<ScriptClassDescriptor> m_renderPipelineAssetClasses;
+    std::unordered_map<std::string, LoadedManagedAssemblyData>
+        m_loadedManagedAssemblies;
     std::unordered_map<InstanceKey, InstanceData, InstanceKeyHasher> m_instances;
     std::unordered_map<uint32_t, ExternalManagedObjectData> m_externalManagedObjects;
     std::shared_ptr<void> m_runtimeLifetimeToken;