Small refactor to have World use WrenHandles to call methods instead of loading strings directly into the vm.

src/scripting/wren_state.cpp

@@ -44,6 +44,52 @@ namespace lunarium
         return mLogCat;
     }
 
+    WrenHandle* WrenState::GetWrenClassHandle(std::string from_module, std::string class_name)
+    {
+        // Load the class into slot 0.
+        wrenEnsureSlots(mpVM, 1);
+        wrenGetVariable(mpVM, from_module.c_str(), class_name.c_str(), 0);
+        WrenHandle* handle = wrenGetSlotHandle(mpVM, 0);
+        return handle;
+    }
+
+    WrenHandle* WrenState::GetWrenMethodHandle(std::string method_signature)
+    {
+        WrenHandle* handle = wrenMakeCallHandle(mpVM, method_signature.c_str());
+        return handle;
+    }
+
+    void WrenState::CallWrenMethod(WrenHandle* method, WrenHandle* receiver, std::vector<WrenParameter> params, std::string name_tag)
+    {
+
+        wrenEnsureSlots(mpVM, params.size() + 1);
+        for (int i = 0; i < params.size(); i++)
+        {
+            switch (params[i].Type)
+            {
+                case WrenParamType::WPT_DOUBLE: wrenSetSlotDouble(mpVM, i + 1, params[i].As.Double); break;
+                case WrenParamType::WPT_BOOL: wrenSetSlotBool(mpVM, i + 1, params[i].As.Bool); break;
+                case WrenParamType::WPT_STR: wrenSetSlotString(mpVM, i + 1, params[i].As.String); break;
+                default: Logger::Warn(mLogCat, "Unknown wren parameter type: %d", (int)params[i].Type);
+            }
+        }
+
+        wrenSetSlotHandle(mpVM, 0, receiver);
+        WrenInterpretResult result = wrenCall(mpVM, method);
+
+        switch (result)
+        {
+            case WREN_RESULT_COMPILE_ERROR: Logger::Trace(mLogCat, "Call compile error in module: %s", name_tag.c_str()); break;
+            case WREN_RESULT_RUNTIME_ERROR: Logger::Trace(mLogCat, "Call runtime error in module: %s", name_tag.c_str()); break;
+            case WREN_RESULT_SUCCESS: Logger::Trace(mLogCat, "Call %s run successfully", name_tag.c_str()); break;
+        }
+    }
+
+    void WrenState::ReleaseWrenHandle(WrenHandle* handle)
+    {
+        wrenReleaseHandle(mpVM, handle);
+    }
+
     
     void WrenState::RunScript(WrenScript* script)
     {

src/scripting/wren_state.h

@@ -15,9 +15,31 @@
 
 #include <wren.hpp>
 #include <string>
+#include <vector>
 
 namespace lunarium
 {
+    enum class WrenParamType
+    {
+        WPT_DOUBLE,
+        WPT_BOOL,
+        WPT_STR,
+    };
+
+    struct WrenParameter
+    {
+        WrenParamType Type;
+        union
+        {
+            double Double;
+            float Float;
+            int Int;
+            char Char;
+            bool Bool;
+            char* String;
+        } As;
+    };
+
     class WrenScript;
 
     class WrenState
@@ -31,6 +53,11 @@ namespace lunarium
         void RunScript(WrenScript* script);
         void RunSnippet(std::string name, std::string code);
 
+        WrenHandle* GetWrenClassHandle(std::string from_module, std::string class_name);
+        WrenHandle* GetWrenMethodHandle(std::string method_signature);  // signature example (mehtod takes 2 parameters): method_name(_,_)
+        void CallWrenMethod(WrenHandle* method, WrenHandle* receiver, std::vector<WrenParameter> params, std::string name_tag);
+        void ReleaseWrenHandle(WrenHandle* handle);
+
     // CALL BACKS
     static void WriteFN(WrenVM* vm, const char* text);
     static void ErrorFN(WrenVM* vm, WrenErrorType type, const char* module, int line, const char* message);

src/world/world.cpp

@@ -45,13 +45,22 @@ namespace lunarium
     {
         mScriptState.Initialize().LogIfFailed(LogCategory::GAME_SYSTEM, "Failed to initialize the world script state");
 
-        // TODO: Load the world interface script
+        // Load the world interface script
         mWorldInterface.SetModuleName("WorldInterface");
         std::string code = File::ReadTextFile("world_interface.wren");  // This will eventually move to internal data
         mWorldInterface.SetScriptCode(code);
 
         mScriptState.RunScript(&mWorldInterface);
-        mScriptState.RunSnippet("WorldInterface", "WorldInterface.Init()");
+
+        // Get class and method handles
+        mWIHandle = mScriptState.GetWrenClassHandle("WorldInterface", "WorldInterface");
+        mWIInitMethod = mScriptState.GetWrenMethodHandle("Init()");
+        mWIDoOnLoadMethod = mScriptState.GetWrenMethodHandle("DoOnLoad()");
+        mWIDoOnUnloadMethod = mScriptState.GetWrenMethodHandle("DoOnUnload()");
+        mWIUpdateMethod = mScriptState.GetWrenMethodHandle("Update(_)");
+
+        // Init the interface
+        mScriptState.CallWrenMethod(mWIInitMethod, mWIHandle, {}, "WorldInterface.Init()");
     }
 
     void World::OnLoad()
@@ -76,13 +85,15 @@ namespace lunarium
         }
 
         // Call OnLoad for each registered EntityBehavior class object
-        mScriptState.RunSnippet("WorldInterface", "WorldInterface.DoOnLoad()");
+        //mScriptState.RunSnippet("WorldInterface", "WorldInterface.DoOnLoad()");
+        mScriptState.CallWrenMethod(mWIDoOnLoadMethod, mWIHandle, {}, "WorldInterface.DoOnLoad()");
     }
     
     void World::OnUnload()
     {
         // TODO: Call OnUnLoad for each registered EntityBehavior class object
-        mScriptState.RunSnippet("WorldInterface", "WorldInterface.DoOnUnload()");
+        //mScriptState.RunSnippet("WorldInterface", "WorldInterface.DoOnUnload()");
+        mScriptState.CallWrenMethod(mWIDoOnUnloadMethod, mWIHandle, {}, "WorldInterface.DoOnUnload()");
         mScriptState.Shutdown();
     }
 
@@ -100,10 +111,11 @@ namespace lunarium
     {
         // Update all scripts
         // Call OnUpdate for each registered EntityBehavior class object
-        std::string code = "WorldInterface.Update(";
-        code.append(std::to_string(dt));
-        code.append(")");
-        mScriptState.RunSnippet("WorldInterface", code);
+        // std::string code = "WorldInterface.Update(";
+        // code.append(std::to_string(dt));
+        // code.append(")");
+        // mScriptState.RunSnippet("WorldInterface", code);
+        mScriptState.CallWrenMethod(mWIUpdateMethod, mWIHandle, { {WrenParamType::WPT_DOUBLE, (double)dt} }, "WorldInterface.Update(dt)");
        
 
 

src/world/world.h

@@ -24,6 +24,8 @@
 #include <vector>
 #include <map>
 
+struct WrenHandle;
+
 namespace lunarium
 {
     class Renderer2D;
@@ -107,6 +109,11 @@ namespace lunarium
         std::string mName;
         WrenState mScriptState;
         WrenScript mWorldInterface;
+        WrenHandle* mWIHandle;
+        WrenHandle* mWIInitMethod;
+        WrenHandle* mWIDoOnLoadMethod;
+        WrenHandle* mWIDoOnUnloadMethod;
+        WrenHandle* mWIUpdateMethod;
 
         // State critical Data
         entt::registry mECSRegistry;