cimgui update

src-csharp/ExampleComponent.cs

@@ -14,6 +14,14 @@ public class ExampleComponent : Component
         Console.WriteLine($"C# deltaTime {deltaTime} object id {Owner.Id}");
         ImGui.Begin("C# WINDOW");
         ImGui.Text("Hello from ExampleComponent!");
+        if (ImGui.Button("create GameObject"))
+        {
+            GameObject.Create();
+        }
+        if (ImGui.Button("GC Collect"))
+        {
+            GC.Collect();
+        }
         ImGui.End();
     }
 }

src-csharp/GameObject.cs

@@ -39,8 +39,9 @@ public class GameObject
 
     static public GameObject Create()
     {
-        NativeMethods.createGameObject(out ulong id, out uint index);
+        NativeFunctions.createGameObject(out ulong id, out uint index);
         var o = new GameObject(id, index);
+        Console.WriteLine($"C# created object with id {id}, index {index}");
         return o;
     }
 
@@ -49,11 +50,17 @@ public class GameObject
         if(_isDestroyed)
             return;
 
-        _isDestroyed = NativeMethods.destroyGameObject(_index);
+        _isDestroyed = NativeFunctions.freeGameObject(_index);
         if(!_isDestroyed)
             throw new Exception($"Can't destroy GameObject({_id})");
     }
 
+    ~GameObject()
+    {
+        // destroys object native part when managed part is garbage-collected
+        Destroy();
+    }
+
     /// <param name="t">type derived from Component</param>
     /// <returns>true if new component instance was created, false if component of the same tipe is already added to GameObject</returns>
     /// <exception cref="Exception"></exception>
@@ -78,6 +85,8 @@ public class GameObject
     
     private void InvokeUpdate(double deltaTime)
     {
+        Console.WriteLine("C# InvokeUpdate");
+        Console.WriteLine($"id {_id}, index {_index}, destroyed {_isDestroyed}");
         foreach (var p in Components)
         {
             p.Value.Update(deltaTime);

src-csharp/NativeFunctions.cs

@@ -0,0 +1,12 @@
+using System.Runtime.CompilerServices;
+
+namespace Ougge;
+
+internal static class NativeFunctions
+{
+    [MethodImpl(MethodImplOptions.InternalCall)]
+    internal extern static void createGameObject(out ulong id, out uint index);
+
+    [MethodImpl(MethodImplOptions.InternalCall)]
+    internal extern static bool freeGameObject(uint index);   
+}

src-csharp/NativeMethods.cs

@@ -1,13 +0,0 @@
-using System;
-using System.Runtime.InteropServices;
-
-namespace Ougge;
-
-internal static class NativeMethods
-{
-    [DllImport("__Internal")]
-    internal extern static bool destroyGameObject(uint index);
-    
-    [DllImport("__Internal")]
-    internal extern static void createGameObject(out ulong id, out uint index);
-}

src/Engine.cpp

@@ -48,7 +48,7 @@ void Engine::stopLoop(){
 void Engine::handleModuleError(IEngineModule& module, const char* type, const char* method, const char* error){
     std::string error_message = ougge_format(
         "Catched %s at %s.%s(): %s",
-        type, module.getName(), method, error);
+        type, module.getName().c_str(), method, error);
     std::cerr<<error_message<<std::endl;
     error_messages.push_back(error_message);
 }

src/game/GameObjectPool.cpp

@@ -94,17 +94,20 @@ std::pair<u32, GameObject&> GameObjectPool::emplace(GameObject&& new_obj)
     return std::pair<u32, GameObject&>(i, r);
 }
 
-void GameObjectPool::erase(u32 index)
+bool GameObjectPool::erase(u32 index)
 {
     if(index >= size)
         throw UsefulException(ougge_format("index %i is out of size %i", index, size));
-    if(!isIndexUsed(index))
-        throw UsefulException(ougge_format("there is no object at index %i", index));
+    if(!isIndexUsed(index)){
+        // throw UsefulException(ougge_format("there is no object at index %i", index));
+        return false;
+    }
     
     buffer[index] = GameObject();
     used_indices[index/64] &= ~(u64(1)<<(index%64)); // mark index bit as unused
     if(index < first_unused_index)
         first_unused_index = index;
+    return true;
 }
 
 GameObjectPool::iterator::iterator(GameObjectPool* pool, u32 index)

src/game/GameObjectPool.hpp

@@ -45,7 +45,7 @@ public:
     ~GameObjectPool();
     GameObject& get(u32 index);
     std::pair<u32, GameObject&> emplace(GameObject&& new_obj);
-    void erase(u32 index);
+    bool erase(u32 index);
 
     #pragma region iterator class
     class iterator {

src/main.cpp

@@ -40,7 +40,7 @@ public:
 void createExampleObject(Engine& engine){
     std::cout<<"creating ExampleObject"<<std::endl;
     auto& monoSystem = engine.getModule<modules::MonoGameObjectSystem>();
-    game::GameObject& exampleObj = monoSystem.createGameObject();
+    game::GameObject& exampleObj = monoSystem.createAndConstructGameObject();
     std::string componentClassName = "Ougge.ExampleComponent";
     if(!monoSystem.tryCreateComponent(exampleObj, componentClassName))
         throw UsefulException(ougge_format("couldn't create component '%s'", componentClassName.c_str()));

src/modules/MonoGameObjectSystem.cpp

@@ -15,18 +15,55 @@ MonoGameObjectSystem::MonoGameObjectSystem(Engine& engine, u32 max_game_objects)
     gameObjectCtor = Mono::Method<void(u64, u32)>(gameObjectClass, ".ctor");
     gameObjectInvokeUpdate = Mono::Method<void(f64)>(gameObjectClass, "InvokeUpdate");
     gameObjectTryCreateComponent = Mono::Method<Mono::Bool(Mono::String)>(gameObjectClass, "TryCreateComponent_internal");
+    registerNativeCallbacks();
+}
+
+// sets implementations for extern functions from src-csharp/NativeFunctions.cs
+void MonoGameObjectSystem::registerNativeCallbacks(){
+    static MonoGameObjectSystem* this_static = this;
+    if(this_static != this)
+        throw new UsefulException("creation of more than one instance of MonoGameObjectSystem is not allowed");
+
+    auto createGameObject_callback = static_cast<void(*)(u64*, u32*)> (
+        [](u64* id_out, u32* index_out) -> void {
+            std::cout<<"createGameObject_callback"<<std::endl;
+            this_static->createGameObjectInPool(id_out, index_out);
+        }
+    );
+    mono_add_internal_call("Ougge.NativeFunctions::createGameObject", (void*)createGameObject_callback);
+    
+    auto freeGameObject_callback = static_cast<bool(*)(u32)>(
+        [](u32 index) -> bool {
+            std::cout<<"freeGameObject_callback"<<std::endl;
+            return this_static->gameObjectPool.erase(index);
+        }
+    );
+    mono_add_internal_call("Ougge.NativeFunctions::freeGameObject", (void*)freeGameObject_callback);
 }
 
 void MonoGameObjectSystem::beginFrame(){
     for(auto pair : gameObjectPool){
-        gameObjectInvokeUpdate(pair.second.getObjectHandle().getObject(), engine.deltaTime);
+
+        auto obj = pair.second.getObjectHandle().getObject();
+        std::cout<<"updating obj: "<<obj<<std::endl;
+        gameObjectInvokeUpdate(obj, engine.deltaTime);
     }
 }
 
-game::GameObject& MonoGameObjectSystem::createGameObject(){
+// is used in NativeFunctions.cs
+game::GameObject& MonoGameObjectSystem::createGameObjectInPool(u64* id_out, u32* index_out){
     auto pair = gameObjectPool.emplace(game::GameObject(mono.createObject(gameObjectClass)));
+    *id_out = ++obj_id;
+    *index_out = pair.first;
     game::GameObject& obj = pair.second;
-    gameObjectCtor(obj.getObjectHandle().getObject(), ++obj_id, pair.first);
+    return obj;
+}
+
+game::GameObject& MonoGameObjectSystem::createAndConstructGameObject(){
+    u64 obj_id;
+    u32 obj_index;
+    game::GameObject& obj = createGameObjectInPool(&obj_id, &obj_index);
+    gameObjectCtor(obj.getObjectHandle().getObject(), obj_id, obj_index);
     return obj;
 }
 

src/modules/MonoGameObjectSystem.hpp

@@ -24,8 +24,12 @@ public:
     const std::string& getName() override;
     void beginFrame() override;
     
-    game::GameObject& createGameObject();
+    game::GameObject& createAndConstructGameObject();
     bool tryCreateComponent(game::GameObject& obj, const std::string& componentClassName);
+
+private:
+    void registerNativeCallbacks();
+    game::GameObject& createGameObjectInPool(u64* id_out, u32* index_out);
 };
 
 }