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;
     }
 
@@ -49,20 +50,26 @@ 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>
     public bool TryCreateComponent(Type t)
     {
-        if(!t.IsSubclassOf(typeof(Component)))
+        if (!t.IsSubclassOf(typeof(Component)))
             throw new Exception($"type {t.FullName} is not a derived class of {typeof(Component).FullName}");
 
-        if(Components.ContainsKey(t))
+        if (Components.ContainsKey(t))
             return false;
 
         Component component = (Component?)Activator.CreateInstance(t, this)
@@ -78,7 +85,9 @@ public class GameObject
     
     private void InvokeUpdate(double deltaTime)
     {
-        foreach(var p in Components)
+        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

@@ -1,26 +1,22 @@
 #include "Engine.hpp"
-#include "gui/gui.hpp"
+#include "common/UsefulException.hpp"
+#include "common/ougge_format.hpp"
+#include "common/time.hpp"
+#include <SDL2/SDL.h>
+#include <iostream>
 
 namespace ougge {
 
-Engine::Engine()
-    : gameObjectPool(GAMEOBJECTPOOL_SIZE), textures(&resourceManager)
+IEngineModule::IEngineModule(Engine& engine)
+    : engine(engine)
+{}
+
+void IEngineModule::beginFrame() {}
+void IEngineModule::endFrame() {}
+
+
+void Engine::startLoop()
 {
-}
-
-void Engine::init(){
-    engineManagedAssembly = mono.loadAssembly("Ougge.dll");
-    gameObjectClass = engineManagedAssembly->getClass("Ougge", "GameObject");
-    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");
-}
-
-void Engine::openMainWindow(const std::string& window_title){
-    mainWindow.open(window_title, resourceManager);
-}
-
-void Engine::startLoop(){
     if(loop_running)
         throw UsefulException("loop is running already");
     
@@ -28,87 +24,79 @@ void Engine::startLoop(){
     loop_running=true;
     // main loop
     while(loop_running){
-        mainWindow.pollEvents(&loop_running);
-        if(!loop_running)
-            break;
-        
         nsec_t update_time_ns = getMonotonicTimeNsec();
         if(update_time_ns < prev_update_time_ns)
             throw UsefulException("monotonic clock returned unexpected value");
         f64 delta_time_s = (f64)(update_time_ns - prev_update_time_ns) / 1e9;
         prev_update_time_ns = update_time_ns;
+        deltaTime = delta_time_s;
 
-        tryDrawFrame(delta_time_s);
+        tryDrawFrame();
         
         nsec_t after_update_time_ns = getMonotonicTimeNsec();
-        nsec_t frame_delay_ns = (nsec_t)1e9 / mainWindow.fps_max - (after_update_time_ns - update_time_ns);
+        nsec_t frame_delay_ns = (nsec_t)1e9 / fps_max - (after_update_time_ns - update_time_ns);
         if(frame_delay_ns > 0){
             SDL_Delay(frame_delay_ns / 1e6);
         }
     }
-
-    mainWindow.close();
 }
 
 void Engine::stopLoop(){
     loop_running = false;
 }
 
-void Engine::tryDrawFrame(f64 deltaTime){
-    static std::string error_message;
-    static bool draw_error_window = false;
-    try {
-        mainWindow.beginFrame();
+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().c_str(), method, error);
+    std::cerr<<error_message<<std::endl;
+    error_messages.push_back(error_message);
+}
 
-        if(draw_error_window)
-            gui::drawErrorWindow(error_message, &draw_error_window);
-        else {
-            updateGameObjects(deltaTime);
-            if(!updateCallback.isNull())
-                updateCallback(deltaTime);
-        }
-        mainWindow.endFrame();
+void Engine::tryDrawFrame(){
+    auto it = modules.begin();
+    while(it != modules.end())
+    {
+        IEngineModule& module = **it;
+        it++;
+        try {
+            module.beginFrame();
         }
         catch(const std::exception& e){
-        error_message = "Catched exception: " + std::string(e.what());
-        draw_error_window = true;
-        std::cerr<<error_message<<std::endl;
+            handleModuleError(module, "exception", "beginFrame", e.what());
         }
         catch(const char* cstr){
-        error_message = "Catched error message (const char*): " + std::string(cstr);
-        draw_error_window = true;
-        std::cerr<<error_message<<std::endl;
+            handleModuleError(module, "error message (const char*)", "beginFrame", cstr);
         }
         catch(const std::string& str){
-        error_message = "Catched error message (std::string): " + str;
-        draw_error_window = true;
-        std::cerr<<error_message<<std::endl;
+            handleModuleError(module, "error message (std::string)", "beginFrame", str.c_str());
         }
         catch(...){
-        error_message = "Catched unknown error";
-        draw_error_window = true;
-        std::cerr<<error_message<<std::endl;
+            handleModuleError(module, "unknown", "beginFrame", "unknown");
+        }
+    }
+
+    it = modules.end();
+    while(it != modules.begin())
+    {
+        it--;
+        IEngineModule& module = **it;
+        try {
+            module.endFrame();
+        }
+        catch(const std::exception& e){
+            handleModuleError(module, "exception", "endFrame", e.what());
+        }
+        catch(const char* cstr){
+            handleModuleError(module, "error message (const char*)", "endFrame", cstr);
+        }
+        catch(const std::string& str){
+            handleModuleError(module, "error message (std::string)", "endFrame", str.c_str());
+        }
+        catch(...){
+            handleModuleError(module, "unknown", "endFrame", "unknown");
+        }
     }
 }
 
-
-void Engine::updateGameObjects(f64 deltaTime){
-    for(auto pair : gameObjectPool){
-        gameObjectInvokeUpdate(pair.second.getObjectHandle().getObject(), deltaTime);
-    }
-}
-
-game::GameObject& Engine::createGameObject(){
-    auto pair = gameObjectPool.emplace(game::GameObject(mono.createObject(gameObjectClass)));
-    game::GameObject& obj = pair.second;
-    gameObjectCtor(obj.getObjectHandle().getObject(), ++obj_id, pair.first);
-    return obj;
-}
-
-bool Engine::tryCreateComponent(game::GameObject& obj, const std::string& componentClassName){
-    Mono::String componentClassNameManaged = mono.createString(componentClassName);
-    Mono::Bool created = gameObjectTryCreateComponent(obj.getObjectHandle().getObject(), componentClassNameManaged);
-    return created.wide_bool;
-}
-
 }

src/Engine.hpp

@@ -1,51 +1,106 @@
 #pragma once
 
-#include "common/function_shared_ptr.hpp"
-#include "mono/mono.hpp"
-#include "game/GameObjectPool.hpp"
-#include "gui/MainWindow.hpp"
-#include "resources/textures.hpp"
+#include <vector>
+#include "common/std.hpp"
+#include "common/UsefulException.hpp"
+#include "common/ougge_format.hpp"
+#include "common/type_name_demangled.hpp"
+#include <type_traits>
+#include <memory>
+#include <iostream>
 
 namespace ougge {
 
-#define GAMEOBJECTPOOL_SIZE 64*1024
+class Engine;
+
+class IEngineModule {
+public:
+    IEngineModule() = delete;
+    IEngineModule(const IEngineModule&) = delete;
+    IEngineModule& operator=(const IEngineModule&) = delete;
+    IEngineModule(IEngineModule&&) = delete;
+    IEngineModule& operator=(IEngineModule&&) = delete;
+
+    Engine& engine;
+    virtual const std::string& getName() = 0;
+
+    virtual void beginFrame();
+    virtual void endFrame();
+
+protected:
+    IEngineModule(Engine& engine);
+};
 
-using UpdateFunc_t = function_shared_ptr<void(f64)>;
 
 class Engine {
+    std::vector<std::unique_ptr<IEngineModule>> modules;
     bool loop_running = false;
 
-    game::GameObjectPool gameObjectPool;
-    u64 obj_id = 0;
-    MonoClass* gameObjectClass;
-    Mono::Method<void(u64, u32)> gameObjectCtor;
-    Mono::Method<void(f64)> gameObjectInvokeUpdate;
-    Mono::Method<Mono::Bool(Mono::String)> gameObjectTryCreateComponent;
-    
 public:
-    gui::MainWindow mainWindow;
-    UpdateFunc_t updateCallback;
+    u32 fps_max = 60;
+    f64 deltaTime;
+    std::vector<std::string> error_messages;
     
-    Mono::RuntimeJIT mono;
-    std::shared_ptr<Mono::Assembly> engineManagedAssembly;
+    Engine() = default;
+    Engine(const Engine&) = delete;
+    Engine& operator=(const Engine&) = delete;
+    Engine(Engine&&) = delete;
+    Engine& operator=(Engine&&) = delete;
 
-    resources::ResourceManager resourceManager;
-    resources::CacheStorage<resources::Texture> textures;
-
-    Engine();
-    void init();
-    void openMainWindow(const std::string& window_title);
     // start game loop on the current thread
     void startLoop();
     void stopLoop();
 
-    game::GameObject& createGameObject();
-    bool tryCreateComponent(game::GameObject& obj, const std::string& componentClassName);
+    //TODO: add std::enable_if
+    template<typename ModuleT, typename... ConstructorArgsT>
+    ModuleT& createModule(ConstructorArgsT&&... args){
+        static_assert(std::is_base_of<IEngineModule, ModuleT>::value);
 
+        auto& module_type_name = ougge_type_name<ModuleT>();
+        //TODO: replace with some logger call
+        std::cout<<"Initializing module '"<<module_type_name<<"'"<<std::endl;
+        
+        size_t module_index;
+        bool module_exists;
+        getOrCreateModuleIndex<ModuleT>(&module_index, &module_exists);
+
+        if(module_exists){
+            throw UsefulException(ougge_format("can't create second instance of module '%s'", 
+                module_type_name.c_str()));
+        }
+
+        //TODO: std::forward(args)...
+        modules.push_back(std::make_unique<ModuleT>(*this, args...));
+        return *static_cast<ModuleT*>(modules[module_index].get());
+    }
+
+    //TODO: add std::enable_if
+    template<typename ModuleT>
+    ModuleT& getModule(){
+        static_assert(std::is_base_of<IEngineModule, ModuleT>::value);
+        
+        size_t module_index;
+        bool module_exists;
+        getOrCreateModuleIndex<ModuleT>(&module_index, &module_exists);
+        if(!module_exists){
+            auto& module_type_name = ougge_type_name<ModuleT>();
+            throw UsefulException(ougge_format("engine has no module '%s'", 
+                module_type_name.c_str()));
+        }
+        return *static_cast<ModuleT*>(modules[module_index].get());
+    } 
 
 private:
-    void tryDrawFrame(f64 deltaTime);
-    void updateGameObjects(f64 deltaTime);
-};
+    void tryDrawFrame();
+    void handleModuleError(IEngineModule& module, const char *type, const char *method, const char *error);
 
+    //TODO: add std::enable_if
+    template<typename ModuleT>
+    void getOrCreateModuleIndex(size_t* out_index, bool* out_module_exists){
+        static size_t module_index = modules.size();
+        *out_index = module_index;
+        // if module_index == modules.size(), then the module hasn't been pushed to the vector yet
+        *out_module_exists = module_index != modules.size();
+    }
+};
 }

src/Game/GameObject.cpp

@@ -1,30 +0,0 @@
-#include "GameObject.hpp"
-
-namespace ougge::game {
-
-std::ostream& operator<<(std::ostream& s, Transform& t){
-    s<<"{ position: {x: "<<t.position.x<<", y: "<<t.position.y;
-    s<<"}, rotation: "<<t.rotation;
-    s<<", scale {x: "<<t.scale.x<<", y: "<<t.scale.y<<"} }";
-    return s;
-}
-
-GameObject::GameObject(Mono::Object managed_obj)
-    : object_handle(managed_obj) 
-{}
-
-GameObject::GameObject(GameObject &&o) :
-    object_handle(std::move(o.object_handle)),
-    parent(o.parent),
-    transform(o.transform)
-{
-}
-
-GameObject& GameObject::operator=(GameObject &&o){
-    object_handle = std::move(o.object_handle);
-    parent = o.parent;
-    transform = o.transform;
-    return *this;
-}
-
-}

src/Game/GameObject.hpp

@@ -1,45 +0,0 @@
-#pragma once
-
-#include <map>
-#include <iostream>
-#include "../common/math.hpp"
-#include "../common/UsefulException.hpp"
-#include "../mono/mono.hpp"
-
-namespace ougge::game {
-
-class GameObject;
-
-struct Transform {
-    Vec2 scale = { 1, 1 };
-    Vec2 position = { 0, 0 };
-    angle_t rotation = 0;
-};
-
-std::ostream& operator<<(std::ostream& s, Transform& t);
-
-
-class GameObject {
-    Mono::ObjectHandle object_handle;
-    GameObject* parent;
-    Transform transform;
-
-public:
-    /// @warning Do not use this to create objects.
-    /// This constructor creates null values for GameObject arrays
-    /// GameObject* array = new GameObject[10];
-    /// array[0] = GameObject(initialized_mono_object_ptr)
-    GameObject() = default;
-    GameObject(Mono::Object managed_obj);
-    GameObject(const GameObject& o) = delete;
-    GameObject(GameObject&& o);
-    
-    GameObject& operator=(GameObject&& o);
-
-    inline Mono::ObjectHandle& getObjectHandle() { return object_handle; }
-    inline GameObject* getParent() { return parent; }
-    inline void setParent(GameObject* p) { parent = p; }
-    inline Transform& getTransform() { return transform; }
-};
-
-}

src/Game/GameObjectPool.cpp

@@ -1,130 +0,0 @@
-#include "GameObjectPool.hpp"
-#include <bit>
-#include <cstring>
-
-namespace ougge::game {
-
-GameObjectPool::GameObjectPool(u32 size)
-{
-    useful_assert(size % 64 == 0, "size of GameObjectPool must be a multiple of 64");
-    this->size = size; 
-    first_unused_index = 0;
-    buffer = new GameObject[size];
-    used_indices = new u64[size/64];
-    // std::memset(buffer, 0, size*sizeof(GameObject));
-    std::memset(used_indices, 0, size/8);
-}
-
-GameObjectPool::~GameObjectPool()
-{
-    delete[] buffer;
-    delete[] used_indices;
-}
-
-bool GameObjectPool::isIndexUsed(u32 index)
-{
-    return ( used_indices[index/64] & (u64(1)<<(index%64)) ) != 0;
-}
-
-u32 GameObjectPool::getNearestUnusedIndex(u32 startIndex)
-{
-    if(startIndex >= size)
-        return -1;
-    if(!isIndexUsed(startIndex))
-        return startIndex;
-    
-    u32 i = startIndex/64;
-    // mark previous bits as used
-    u64 u = used_indices[i] | ( (u64(1)<<startIndex%64) -1 );
-    while(u == u64(-1)){
-        i++;
-        if(i == size/64)
-            return -1;
-        u = used_indices[i];
-    }
-    u32 bitpos = std::countr_one(u);
-    if(bitpos == 64)
-        return -1;
-    u32 index = i*64 + bitpos;
-    return index;
-}
-
-u32 GameObjectPool::getNearestUsedIndex(u32 startIndex)
-{
-    if(startIndex >= size)
-        return -1;
-    if(isIndexUsed(startIndex))
-        return startIndex;
-    
-    u32 i = startIndex/64;
-    // mark previous bits as unused
-    u64 u = used_indices[i] & !( (u64(1)<<startIndex%64) -1 );
-    while(u == 0){
-        i++;
-        if(i == size/64)
-            return -1;
-        u = used_indices[i];
-    }
-    u32 bitpos = std::countr_zero(u);
-    if(bitpos == 64)
-        return -1;
-    u32 index = i*64 + bitpos;
-    return index;
-}
-
-GameObject& GameObjectPool::get(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));
-    return buffer[index];
-}
-
-std::pair<u32, GameObject&> GameObjectPool::emplace(GameObject&& new_obj)
-{
-    u32 i = first_unused_index;
-    if(i == u32(-1))
-        throw UsefulException("can't put new GameObject to GameObjectPool because it's full");
-    
-    buffer[i] = std::move(new_obj);
-    GameObject& r = buffer[i];
-    used_indices[i/64] |= u64(1)<<(i%64); // mark index bit as used
-    first_unused_index = getNearestUnusedIndex(i+1);
-    return std::pair<u32, GameObject&>(i, r);
-}
-
-void 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));
-    
-    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;
-}
-
-GameObjectPool::iterator::iterator(GameObjectPool* pool, u32 index)
-    : pool(pool), index(index)
-{
-}
-
-std::pair<u32, GameObject&> GameObjectPool::iterator::operator*()
-{
-    if(index >= pool->size)
-        throw UsefulException("can't get value of end() iterator");
-    
-    GameObject& r = pool->buffer[index];
-    return  std::pair<u32, GameObject&>(index, r);
-}
-
-GameObjectPool::iterator& GameObjectPool::iterator::operator++()
-{
-    index = pool->getNearestUsedIndex(index+1);
-    return *this;
-}
-
-}

src/Game/GameObjectPool.hpp

@@ -1,70 +0,0 @@
-#include "GameObject.hpp"
-
-namespace ougge::game {
-
-/*
-Fixed array that stores deleted elements indices as bits in array of u64.
-Fast emplace, erase and lookup. 
-
-------------------------[construct]------------------------
-operation 'GameObjectPool::GameObjectPool()' took 1.0549 ms
-operation 'other_collections_construct' took 0.0133 ms
--------------------------[emplace]-------------------------
-operation 'GameObjectPool::emplace' took 8.0557 ms
-operation 'vector::emplace_back' took 11.3735 ms
-operation 'set::emplace' took 80.5633 ms
-operation 'list::emplace_front' took 18.1442 ms
-operation 'forward_list::emplace_front' took 11.5467 ms
---------------------------[erase]--------------------------
-operation 'GameObjectPool::erase' took 0.2745 ms
-operation 'vector::erase' took 15790.6 ms
-operation 'set::erase' took 1.2697 ms
-operation 'list::erase_after' took 0.93 ms
-operation 'forward_list::erase_after' took 1.1127 ms
--------------------------[iterate]-------------------------
-operation 'GameObjectPool::iterate' took 1.1166 ms
-operation 'vector::iterate' took 0.8883 ms
-operation 'set::iterate' took 2.8011 ms
-operation 'list::iterate' took 2.0766 ms
-operation 'forward_list::iterate' took 2.0823 ms
-*/
-
-class GameObjectPool {
-    GameObject* buffer;
-    u64* used_indices;
-    u32 size;
-    u32 first_unused_index;
-
-    bool isIndexUsed(u32 index);
-    u32 getNearestUnusedIndex(u32 startIndex);
-    u32 getNearestUsedIndex(u32 startIndex);
-public:
-
-    ///@param size must be a multiple of 64
-    GameObjectPool(u32 size);
-    ~GameObjectPool();
-    GameObject& get(u32 index);
-    std::pair<u32, GameObject&> emplace(GameObject&& new_obj);
-    void erase(u32 index);
-
-    #pragma region iterator class
-    class iterator {
-        GameObjectPool* pool;
-        u32 index = 0;
-    
-    public:
-        iterator(GameObjectPool* pool, u32 index);
-        std::pair<u32, GameObject&> operator*();
-        iterator& operator++();
-        inline bool operator!=(const iterator& o) const { return index != o.index; };
-        inline bool operator==(const iterator& o) const { return index == o.index; };
-    };
-    #pragma endregion
-
-    inline iterator begin() { return iterator(this, 0); }
-    inline iterator end() { return iterator(this, -1); }
-    
-    friend class iterator;
-};
-
-}

src/Mono/Assembly.cpp

@@ -1,17 +0,0 @@
-#include "mono.hpp"
-
-namespace Mono {
-
-Assembly::Assembly(MonoAssembly *ptr)
-    : ptr(ptr), image(mono_assembly_get_image(ptr))
-{
-}
-
-MonoClass* Assembly::getClass(const std::string &name_space, const std::string &name){
-    auto c = mono_class_from_name(image, name_space.c_str(), name.c_str());
-    if(!c)
-        throw UsefulException(ougge_format("can't get class '%s.%s'", name_space.c_str(), name.c_str()));
-    return c;
-}
-
-}

src/Mono/Mono.cpp

@@ -1,81 +0,0 @@
-#include "mono.hpp"
-#include <mono/metadata/appdomain.h>
-
-namespace Mono {
-
-template <> MonoClass* getClass<SByte>(){ return mono_get_sbyte_class(); }
-template <> MonoClass* getClass<Byte>(){ return mono_get_byte_class(); }
-template <> MonoClass* getClass<Short>(){ return mono_get_int16_class(); }
-template <> MonoClass* getClass<UShort>(){ return mono_get_uint16_class(); }
-template <> MonoClass* getClass<Int>(){ return mono_get_int32_class(); }
-template <> MonoClass* getClass<UInt>(){ return mono_get_uint32_class(); }
-template <> MonoClass* getClass<Long>(){ return mono_get_int64_class(); }
-template <> MonoClass* getClass<ULong>(){ return mono_get_uint64_class(); }
-template <> MonoClass* getClass<Float>(){ return mono_get_single_class(); }
-template <> MonoClass* getClass<Double>(){ return mono_get_double_class(); }
-template <> MonoClass* getClass<Bool>(){ return mono_get_boolean_class(); }
-template <> MonoClass* getClass<Char>(){ return mono_get_char_class(); }
-template <> MonoClass* getClass<String>(){ return mono_get_string_class(); }
-template <> MonoClass* getClass<Object>(){ return mono_get_object_class(); }
-template <> MonoClass* getClass<Void>(){ return mono_get_void_class(); }
-
-
-void getMethodSignatureTypes(MonoMethod* mono_method,
-        MonoType** return_type,
-        std::vector<MonoType*>& argument_types)
-{
-    auto signature = mono_method_signature(mono_method);
-    void* iter = nullptr;
-    *return_type = mono_signature_get_return_type(signature);
-    MonoType* pt = nullptr;
-    while( (pt = mono_signature_get_params(signature, &iter)) ){
-        argument_types.push_back(pt);
-    }
-}
-
-MonoMethod* tryGetMonoMethod(MonoClass* target_class, const std::string& name,
-        MonoClass* return_class, MonoClass* arg_classes[], size_t arg_classes_size)
-{
-    if(target_class == nullptr)
-        throw UsefulException("target_class is nullptr");
-    
-    // iterate each method
-    void* iter = nullptr;
-    MonoMethod* m = nullptr;
-    std::vector<MonoType*> argument_types;
-    while( (m = mono_class_get_methods(target_class, &iter)) ){
-        // compare name
-        std::string m_name = mono_method_get_name(m);
-        if(m_name != name)
-            continue;
-        
-        argument_types.clear();
-        MonoType* return_type = nullptr;
-        getMethodSignatureTypes(m, &return_type, argument_types);
-        // compare argument count
-        if(argument_types.size() != arg_classes_size)
-            continue;
-        
-        // compare return type
-        if(!mono_metadata_type_equal(return_type, mono_class_get_type(return_class)))
-            continue;
-        
-        // compare argument types
-        bool argument_types_mismatch = false;
-        for(size_t i = 0; i < arg_classes_size; i++){
-            if(!mono_metadata_type_equal(argument_types[i], mono_class_get_type(arg_classes[i]))){
-                argument_types_mismatch = true;
-                break;
-            }
-        }
-        if(argument_types_mismatch)
-            continue;
-        
-        // passed all tests successfully
-        break;
-    }
-
-    return m;
-}
-
-}

src/Mono/Mono.hpp

@@ -1,187 +0,0 @@
-#pragma once
-
-#include "../common/std.hpp"
-#include "../common/UsefulException.hpp"
-#include "../common/ougge_format.hpp"
-#include <vector>
-#include <type_traits>
-#include <mono/metadata/class.h>
-#include <mono/metadata/assembly.h>
-#include <mono/metadata/object.h>
-
-namespace Mono {
-
-typedef i8 SByte;
-typedef u8 Byte;
-typedef i16 Short;
-typedef u16 UShort;
-typedef i32 Int;
-typedef u32 UInt;
-typedef i64 Long;
-typedef u64 ULong;
-typedef f32 Float;
-typedef f64 Double;
-typedef union { mono_bool wide_bool; } Bool; //USAGE: Bool t = {true};
-typedef char16_t Char;
-typedef MonoString* String;
-/// @warning MonoObject can be moved in memory by GC in any time and raw pointer will be invalid. 
-/// Use ObjectHandle where it is possible.
-typedef MonoObject* Object;
-typedef void Void;
-
-
-template<typename PrimitiveT>
-MonoClass* getClass(); 
-
-template<typename T>
-void* valueToVoidPtr(T& v){ return &v; }
-template<>
-inline void* valueToVoidPtr<Object>(Object& v){ return v; }
-template<>
-inline void* valueToVoidPtr<String>(String& v){ return v; }
-
-template<typename T>
-T valueFromMonoObject(MonoObject* o){
-    void* result_value_ptr = mono_object_unbox(o);
-    if(result_value_ptr == nullptr)
-        throw UsefulException("can't unbox method value");
-    return *((T*)result_value_ptr);
-}
-template<>
-inline Object valueFromMonoObject<Object>(MonoObject* o){ return o; }
-template<>
-inline String valueFromMonoObject<String>(MonoObject* o){ return (String)((void*)o); }
-
-void getMethodSignatureTypes(MonoMethod* mono_method,
-        MonoType** return_type,
-        std::vector<MonoType*>& argument_types);
-
-/// searches for method `name` in `target_class` with return type `return_class` and argument types `arg_classes`
-/// @return found method or nullptr
-MonoMethod* tryGetMonoMethod(MonoClass* target_class, const std::string& name,
-    MonoClass* return_class, MonoClass* arg_classes[], size_t arg_classes_size);
-
-
-template<typename SignatureT> class Method;
-template<typename ReturnT, typename... ArgTypes>
-class Method<ReturnT(ArgTypes...)>
-{
-    MonoMethod* method_ptr;
-
-public:
-    Method() { method_ptr = nullptr; }
-
-    /// all types must implement getClass<T>()
-    Method(MonoClass* target_class, const std::string& name){
-        static MonoClass* arg_classes[] { getClass<ArgTypes>()... };
-        static MonoClass* return_class { getClass<ReturnT>() };
-        method_ptr = tryGetMonoMethod(target_class, name, return_class, arg_classes, sizeof...(ArgTypes));
-        if(method_ptr == nullptr){
-            throw UsefulException(ougge_format("can't get method '%s' from class '%s'",
-                name.c_str(), mono_class_get_name(target_class)));
-        }
-    }
-
-    // ReturnT not is void
-    template<typename RT = ReturnT>
-    std::enable_if_t<!std::is_void<RT>::value, RT> operator()(MonoObject* class_instance, ArgTypes... args) const {
-        if(method_ptr == nullptr)
-            throw UsefulException("method_ptr is null");
-        
-        void* arg_array[] = { valueToVoidPtr(args)..., nullptr };
-        MonoObject* ex = nullptr;
-        MonoObject* result = mono_runtime_invoke(method_ptr, class_instance, arg_array, &ex);
-        if(ex){
-            //TODO:  call mono_trace_set_printerr_handler from  mono/mono/utils/mono-logger.h
-            mono_print_unhandled_exception(ex);
-            throw UsefulException("Some C# exception occured");
-        }
-        return valueFromMonoObject<ReturnT>(result);
-    };
-
-    // ReturnT is void
-    template<typename RT = ReturnT>
-    std::enable_if_t<std::is_void<RT>::value, RT> operator()(MonoObject* class_instance, ArgTypes... args) const {
-        if(method_ptr == nullptr)
-            throw UsefulException("method_ptr is null");
-        
-        void* arg_array[] = { valueToVoidPtr(args)..., nullptr };
-        MonoObject* ex = nullptr;
-        mono_runtime_invoke(method_ptr, class_instance, arg_array, &ex);
-        if(ex){
-            //TODO:  call mono_trace_set_printerr_handler from  mono/mono/utils/mono-logger.h
-            mono_print_unhandled_exception(ex);
-            throw UsefulException("Some C# exception occured");
-        }
-    };
-};
-
-
-class Assembly {
-    MonoAssembly* ptr;
-    MonoImage* image;
-
-public:
-    Assembly(MonoAssembly* ptr);
-    Assembly(const Assembly&) = delete;
-    
-    MonoClass* getClass(const std::string& name_space, const std::string& name);
-    MonoAssembly* getMonoAssembly() const { return ptr; }
-    MonoImage* getMonoImage() const { return image; }
-};
-
-
-///LINUX: `config.xml`, `mscorelib.dll`, `libmono-native.so` in `mono-libs` directory
-///
-///WINDOWS: `config.xml`, `mscorelib.dll` in `mono-libs` directory
-class RuntimeJIT {
-    MonoDomain* domain;
-public:
-    RuntimeJIT(const std::string& domain_name = "OuggeDomain");
-    RuntimeJIT(const RuntimeJIT&) = delete;
-    ~RuntimeJIT();
-    
-    inline MonoDomain* getDomain() { return domain; }
-    std::shared_ptr<Assembly> loadAssembly(const std::string& name);
-
-    inline Object createObject(MonoClass* klass) { return mono_object_new(domain, klass); }
-    inline String createString(const std::string& v) { return mono_string_new_len(domain, v.c_str(), v.size()); }
-    inline String createString(const char* v) { return mono_string_new(domain, v); }
-};
-
-/// @brief ObjectHandle can be used to store reliable reference to MonoObject.
-/// MonoObject can be moved in memory by GC in any time and raw pointer will be invalid. 
-struct ObjectHandle {
-    u32 gc_handle;
-
-    inline ObjectHandle() : gc_handle(0) {}
-
-    inline ObjectHandle(Object obj) {
-        gc_handle = mono_gchandle_new(obj, false);
-    }
-
-    /// implicitly create new ObjectHandle instead
-    inline ObjectHandle(const ObjectHandle& o) = delete;
-
-    inline ObjectHandle(ObjectHandle&& o) {
-        gc_handle = o.gc_handle;
-        o.gc_handle = 0;
-    }
-
-    inline ObjectHandle& operator=(ObjectHandle&& o) {
-        gc_handle = o.gc_handle;
-        o.gc_handle = 0;
-        return *this;
-    }
-
-    inline ~ObjectHandle() {
-        if(gc_handle)
-            mono_gchandle_free(gc_handle);
-    }
-
-    inline Object getObject() const {
-        return mono_gchandle_get_target(gc_handle);
-    }
-};
-
-}

src/Mono/Runtime.cpp

@@ -1,30 +0,0 @@
-#include "mono.hpp"
-#include <mono/jit/jit.h>
-#include <mono/metadata/mono-config.h>
-#include <mono/metadata/appdomain.h>
-
-namespace Mono {
-
-RuntimeJIT::RuntimeJIT(const std::string& domain_name){
-    mono_set_dirs("mono-libs", "mono-libs");
-    mono_set_assemblies_path("mono-libs");
-    mono_config_parse("mono-libs/config.xml");
-
-    domain = mono_jit_init(domain_name.c_str());
-    if(!domain)
-        throw UsefulException("can't initialize mono domain");
-}
-
-RuntimeJIT::~RuntimeJIT(){
-    // TODO: fix segfault on cleanup
-    // mono_jit_cleanup(domain);
-}
-
-std::shared_ptr<Assembly> RuntimeJIT::loadAssembly(const std::string &name){
-    MonoAssembly* ptr = mono_domain_assembly_open(domain, name.c_str());
-    if(!ptr)
-        throw UsefulException(ougge_format("can't load assembly '%s'", name.c_str()));
-    return std::make_shared<Assembly>(ptr);
-}
-
-}

src/Resources/MemorySteam.cpp

@@ -1,40 +0,0 @@
-#include "MemoryStream.hpp"
-
-class MemoryStreamBuf : public std::streambuf {
-public:
-    MemoryStreamBuf(void* p, const std::size_t n);
-
-    virtual std::istream::pos_type seekoff(
-        std::istream::off_type off,
-        std::ios_base::seekdir dir,
-        std::ios_base::openmode which);
-};
-
-MemoryStreamBuf::MemoryStreamBuf(void* _p, const std::size_t n){
-    char* p=(char*)_p;
-    setg(p, p, p + n);
-    setp(p, p + n);
-}
-
-std::istream::pos_type MemoryStreamBuf::seekoff(
-    std::istream::off_type off,
-    std::ios_base::seekdir dir,
-    std::ios_base::openmode which)
-{
-    if (dir == std::ios_base::cur)
-        gbump(off);
-    else if (dir == std::ios_base::end)
-        setg(eback(), egptr() + off, egptr());
-    else if (dir == std::ios_base::beg)
-        setg(eback(), eback() + off, egptr());
-    return gptr() - eback();
-}
-
-
-MemoryStreamRead::MemoryStreamRead(const void* p, const std::size_t n)
-    : std::istream(new MemoryStreamBuf((void*)p, n))
-{}
-
-MemoryStreamRead::~MemoryStreamRead(){
-    delete rdbuf();
-}

src/Resources/MemoryStream.hpp

@@ -1,8 +0,0 @@
-#include <iostream>
-
-class MemoryStreamRead : public std::istream {
-public:
-    MemoryStreamRead(const void* p, const std::size_t n);
-
-    virtual ~MemoryStreamRead();
-};

src/Resources/embedded_resources.h

@@ -1,64 +0,0 @@
-////////////////////////////////////////////////////////////////
-//        This file was generated by resource_embedder        //
-//  https://timerix.ddns.net:3322/Timerix/resource_embedder   //
-////////////////////////////////////////////////////////////////
-//                          USAGE:                            //
-//    Put it in a SOURCE file to define variables             //
-//  #define EMBEDDED_RESOURCE_DEFINITION                      //
-//  #define EMBEDDED_RESOURCE_POSTFIX your_postfix            //
-//  #include "../../src/Resources/embedded_resources.h"       //
-//                                                            //
-//    Put it in a HEADER file to declare external variables   //
-//  #define EMBEDDED_RESOURCE_POSTFIX your_postfix            //
-//  #include "../../src/Resources/embedded_resources.h"       //
-//                                                            //
-//    Then you can access embedded files through              //
-//  EmbeddedResource_table_your_postfix. You can get table    //
-//  content by index and put it into a hashtable or a map.    //
-////////////////////////////////////////////////////////////////
-
-#pragma once
-#if __cplusplus
-extern "C" {
-#endif
-
-#include <stdint.h>
-#include <stddef.h>
-
-typedef struct {
-    const char* path;
-    const char* data;
-    size_t size;
-} EmbeddedResource;
-
-#define RSCAT(A,B,C...) A##B##C
-#ifdef EMBEDDED_RESOURCE_POSTFIX
-    #define _EmbeddedResource_table(P) \
-        RSCAT(EmbeddedResource_table_, P)
-    #define _EmbeddedResource_table_count(P) \
-        RSCAT(EmbeddedResource_table_, P, _count)
-#else
-    #define _EmbeddedResource_table(P) \
-        EmbeddedResource_table
-    #define _EmbeddedResource_table_count(P) \
-        EmbeddedResource_table_count
-#endif
-extern const EmbeddedResource _EmbeddedResource_table(EMBEDDED_RESOURCE_POSTFIX)[];
-extern const int _EmbeddedResource_table_count(EMBEDDED_RESOURCE_POSTFIX);
-
-#ifdef EMBEDDED_RESOURCE_DEFINITION
-const EmbeddedResource _EmbeddedResource_table(EMBEDDED_RESOURCE_POSTFIX)[]={
-
-};
-
-const int _EmbeddedResource_table_count(EMBEDDED_RESOURCE_POSTFIX)=0;
-#endif // EMBEDDED_RESOURCE_DEFINITION
-
-#undef _EmbeddedResource_table
-#undef _EmbeddedResource_table_count
-#undef EMBEDDED_RESOURCE_POSTFIX
-#undef RSCAT
-
-#if __cplusplus
-}
-#endif

src/Resources/fonts.cpp

@@ -1,29 +0,0 @@
-#include "fonts.hpp"
-
-namespace ougge::resources {
-
-// select all glyphs from font
-static const ImWchar glyph_ranges[] = {
-    0x0020, 0xFFFF, 0
-};
-
-ImFont* ImFont_LoadFromFile(const std::string& file_path, f32 font_size, f32 dpi){
-    ImGuiIO& io = ImGui::GetIO();
-    font_size *= dpi;
-    return io.Fonts->AddFontFromFileTTF(file_path.c_str(), font_size, nullptr, glyph_ranges);
-}
-
-ImFont* ImFont_LoadFromResource(ResourceFactory* res, f32 font_size, f32 dpi){
-    ImGuiIO& io = ImGui::GetIO();
-    font_size *= dpi;
-    ImFontConfig font_cfg = ImFontConfig();
-    std::sprintf(font_cfg.Name, "%s %ipx", res->path.c_str(), (i32)font_size);
-    
-    char* font_data = new char[res->size]; 
-    res->openStream()->read(font_data, res->size);
-
-    return io.Fonts->AddFontFromMemoryTTF((void*)(font_data), res->size,
-        font_size, &font_cfg, glyph_ranges);
-}
-
-}

src/Resources/fonts.hpp

@@ -1,13 +0,0 @@
-#pragma once
-
-#include <imgui.h>
-#include "../common/std.hpp"
-#include "resources.hpp"
-
-namespace ougge::resources {
-
-ImFont* ImFont_LoadFromFile(const std::string& file_path, f32 font_size, f32 dpi);
-
-ImFont* ImFont_LoadFromResource(ResourceFactory* res, f32 font_size, f32 dpi);
-
-}

src/common/UsefulException.hpp

@@ -15,7 +15,7 @@ class UsefulException_ : public std::exception {
 public:
     UsefulException_(const std::string& msg, const std::string& _file, const std::string& _func, int line_n);
 
-    virtual char const* what() const noexcept;
+    char const* what() const noexcept override;
 };
 
 #define useful_assert(EXPR, ERRMSG) if(!(EXPR)) throw UsefulException(ERRMSG);

src/common/function_shared_ptr.hpp

@@ -30,13 +30,12 @@ public:
 
     bool isNull() const { return func_ptr == nullptr; }
 
-    //TODO: make inline
-
     // ReturnT is not void
     template<typename RT = ReturnT>
     std::enable_if_t<!std::is_void<RT>::value, RT>  operator()(ArgTypes... args){
         if(func_ptr == nullptr)
             throw UsefulException("function_shared_ptr is null");
+        //TODO: think about std::forward(args)...
         return func_ptr->operator()(args...);
     }
     

src/common/std.hpp

@@ -17,7 +17,6 @@ typedef double f64;
 /// anonymous pointer without specified freeMembers() func
 typedef void* Pointer;
 
-#define nameof(V) #V
 
 #ifdef _MSC_VER
     #pragma comment(lib, "mincore_downlevel.lib") // Support OS older than SDK

src/common/type_name_demangled.hpp

@@ -0,0 +1,44 @@
+// https://stackoverflow.com/a/53865723
+
+#pragma once
+#ifndef _MSC_VER
+    #include <cxxabi.h>
+#endif
+#include <memory>
+#include <string>
+#include <cstdlib>
+
+template <class T>
+std::string _ougge_type_name_demangled()
+{
+    typedef typename std::remove_reference<T>::type TR;
+    const char* type_name_mangled = typeid(TR).name();
+    std::unique_ptr<char, void(*)(void*)> own
+        (
+#ifndef _MSC_VER
+            abi::__cxa_demangle(type_name_mangled, nullptr, nullptr, nullptr),
+#else
+            nullptr,
+#endif
+            std::free
+        );
+    std::string r = own ? own.get() : type_name_mangled;
+    
+    if (std::is_const<TR>::value)
+        r += " const";
+    if (std::is_volatile<TR>::value)
+        r += " volatile";
+    if (std::is_lvalue_reference<T>::value)
+        r += "&";
+    else if (std::is_rvalue_reference<T>::value)
+        r += "&&";
+    
+    return r;
+}
+
+/// @return human-readable type name
+template <class T>
+const std::string& ougge_type_name(){
+    static std::string name = _ougge_type_name_demangled<T>();
+    return name;
+}

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/gui/ErrorWindow.cpp

@@ -1,11 +0,0 @@
-#include "gui.hpp"
-
-namespace ougge::gui {
-
-void drawErrorWindow(const std::string& msg, bool* draw_error_window){
-    ImGui::Begin("ERROR", draw_error_window);
-        ImGui::Text("%s", msg.c_str());
-    ImGui::End();
-}
-
-}

src/gui/MainWindow.cpp

@@ -1,220 +0,0 @@
-#include <backends/imgui_impl_sdl2.h>
-#include <backends/imgui_impl_sdlrenderer2.h>
-#include <iostream>
-#include "MainWindow.hpp"
-#include "gui_exceptions.hpp"
-#include "../common/ougge_format.hpp"
-#include "../common/math.hpp"
-
-namespace ougge::gui {
-
-f32 MainWindow::getDPI(){
-    i32 w=0, h=0;
-    SDL_GetRendererOutputSize(sdl_renderer, &w, &h);
-    i32 sim_w=0, sim_h=0;
-    SDL_GetWindowSize(sdl_window, &sim_w, &sim_h);
-    f32 wdpi=(f32)w / sim_w;
-    f32 hdpi=(f32)h / sim_h;
-    f32 dpi=SDL_sqrtf(wdpi*wdpi + hdpi*hdpi);
-    return dpi;
-}
-
-void MainWindow::open(const std::string& window_title, resources::ResourceManager& resourceManager){
-    SDL_TRY(SDL_Init(SDL_INIT_EVERYTHING));
-    SDL_version v;
-    SDL_GetVersion(&v);
-    std::cout<<ougge_format("SDL version: %u.%u.%u\n", v.major, v.minor, v.patch);
-    
-    // From 2.0.18: Enable native IME.
-#ifdef SDL_HINT_IME_SHOW_UI
-    SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
-#endif
-    
-    SDL_WindowFlags window_flags = (SDL_WindowFlags)(
-        SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI
-    );
-    sdl_window = SDL_CreateWindow(window_title.c_str(),
-        SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
-        1280, 720, window_flags);
-    if(sdl_window == nullptr)
-        throw SDLException();
-    
-    SDL_RendererFlags renderer_flags = (SDL_RendererFlags)(
-        SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC
-    );
-    sdl_renderer = SDL_CreateRenderer(sdl_window, -1, renderer_flags);
-    if(sdl_renderer == nullptr)
-        throw SDLException();
-    
-    SDL_RendererInfo info;
-    SDL_GetRendererInfo(sdl_renderer, &info);
-    std::cout<<"Current SDL_Renderer driver: "<<info.name<<std::endl;
-
-    // Setup Dear ImGui context
-    IMGUI_CHECKVERSION();
-    ImGui::CreateContext();
-    ImGuiIO& io = ImGui::GetIO();
-    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls   
-    io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;  // Enable Gamepad Controls
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;     // Enable Docking
-    io.ConfigDockingTransparentPayload = true;
-    io.ConfigInputTextCursorBlink = false;
-    // io.ConfigViewportsNoTaskBarIcon = true;
-    io.ConfigWindowsMoveFromTitleBarOnly = true;
-
-    // Setup Platform/Renderer backends
-    if(!ImGui_ImplSDL2_InitForSDLRenderer(sdl_window, sdl_renderer))
-        throw SDLException();
-    if(!ImGui_ImplSDLRenderer2_Init(sdl_renderer))
-        throw SDLException();
-
-    // Setup Dear ImGui style
-    ImGui::StyleColorsDark();
-    
-    resources::ResourceFactory* font_res = resourceManager.tryGetResource(default_font_path);
-    if(font_res == nullptr)
-        throw UsefulException("can't find default font resource");
-    f32 dpi = getDPI();
-    io.FontDefault = resources::ImFont_LoadFromResource(font_res, default_font_size, dpi);
-}
-
-void MainWindow::close(){
-    ImGui_ImplSDLRenderer2_Shutdown();
-    ImGui_ImplSDL2_Shutdown();
-    ImGui::DestroyContext();
-    SDL_DestroyRenderer(sdl_renderer);
-    SDL_DestroyWindow(sdl_window);
-    SDL_Quit();
-}
-
-void MainWindow::pollEvents(bool* loopRunning){
-    SDL_Event event;
-    while (SDL_PollEvent(&event)) {
-        ImGui_ImplSDL2_ProcessEvent(&event);
-        switch(event.type){
-            case SDL_QUIT: {
-                *loopRunning = false;
-                break;
-            }
-            case SDL_WINDOWEVENT: {
-                if(event.window.event == SDL_WINDOWEVENT_CLOSE 
-                    && event.window.windowID == SDL_GetWindowID(sdl_window))
-                {
-                    *loopRunning = false;
-                }
-                break;
-            }
-        }
-    }
-}
-
-
-void MainWindow::beginFrame(){
-    // Start the Dear ImGui frame
-    ImGui_ImplSDLRenderer2_NewFrame();
-    ImGui_ImplSDL2_NewFrame();
-    ImGui::NewFrame();
-
-    ImGuiIO& io = ImGui::GetIO();
-    SDL_RenderSetScale(sdl_renderer, io.DisplayFramebufferScale.x, io.DisplayFramebufferScale.y);
-    SDL_SetRenderDrawColor(sdl_renderer, 
-        (u8)(clear_color.x * 255),
-        (u8)(clear_color.y * 255),
-        (u8)(clear_color.z * 255),
-        (u8)(clear_color.w * 255));
-    SDL_RenderClear(sdl_renderer);
-
-    draw_bg_window();
-    draw_debug_window();
-}
-
-void MainWindow::endFrame(){
-    ImGui::Render();
-    ImGui_ImplSDLRenderer2_RenderDrawData(ImGui::GetDrawData(), sdl_renderer);
-    // Swap buffers
-    SDL_RenderPresent(sdl_renderer);
-}
-
-void MainWindow::draw_bg_window(){
-    const ImGuiDockNodeFlags dockspace_flags =
-            ImGuiDockNodeFlags_PassthruCentralNode;
-    const ImGuiWindowFlags window_flags =
-        ImGuiWindowFlags_MenuBar |
-        ImGuiWindowFlags_NoDocking |
-        ImGuiWindowFlags_NoScrollbar |
-        ImGuiWindowFlags_NoScrollWithMouse |
-        ImGuiWindowFlags_NoBringToFrontOnFocus |
-        ImGuiWindowFlags_NoFocusOnAppearing |
-        ImGuiWindowFlags_NoMove |
-        ImGuiWindowFlags_NoResize |
-        ImGuiWindowFlags_NoCollapse |
-        ImGuiWindowFlags_NoTitleBar |
-        ImGuiWindowFlags_NoBackground;
-    // not dockable window that always bound to viewport
-    ImGuiViewport* viewport = ImGui::GetWindowViewport();
-    ImGui::SetNextWindowPos(viewport->Pos, ImGuiCond_Always);
-    ImGui::SetNextWindowSize(viewport->Size, ImGuiCond_Always);
-    ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
-    ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);
-	ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
-    ImGui::Begin("bg_window", nullptr, window_flags);
-    ImGui::PopStyleVar(3);
-
-    // DockSpace
-    ImGuiID dockspace_id = ImGui::GetID("bg_dockspace");
-    ImGui::DockSpace(dockspace_id, ImVec2(0.0f, 0.0f), dockspace_flags);
-    
-    // MenuBar
-    if(ImGui::BeginMainMenuBar()){
-        if(ImGui::BeginMenu("test")){
-            if(ImGui::MenuItem("throw exception")){
-                ImGui::EndMenu();
-                ImGui::EndMainMenuBar();
-                ImGui::End();
-                throw UsefulException("example exception");
-            }
-            if(ImGui::MenuItem("throw const char*")){
-                ImGui::EndMenu();
-                ImGui::EndMainMenuBar();
-                ImGui::End();
-                throw "cptr";
-            }
-            if(ImGui::MenuItem("throw std::string")){
-                ImGui::EndMenu();
-                ImGui::EndMainMenuBar();
-                ImGui::End();
-                throw std::string("str");
-            }
-            if(ImGui::MenuItem("throw unknown")){
-                ImGui::EndMenu();
-                ImGui::EndMainMenuBar();
-                ImGui::End();
-                throw 111;
-            }
-            ImGui::EndMenu();
-        }
-        ImGui::EndMainMenuBar();
-    }
-
-    ImGui::End();
-}
-
-void MainWindow::draw_debug_window(){
-    ImGuiIO& io = ImGui::GetIO();
-    if(ImGui::Begin("Debug Options", &show_debug_window)){
-        ImGui::ColorEdit3("clear_color", (float*)&clear_color);
-        ImGui::InputInt("fps_max", &fps_max);
-        ImGui::Text("Application average %.3f ms/frame (%.2f FPS)", 1000.0f / io.Framerate, io.Framerate);
-        ImGui::Checkbox("Demo Window", &show_demo_window);
-        ImGui::Checkbox("Metrics/Debug Window", &show_metrics_window);
-        ImGui::End();
-    }
-
-    if (show_demo_window)
-        ImGui::ShowDemoWindow(&show_demo_window);
-
-    if (show_metrics_window)
-        ImGui::ShowMetricsWindow(&show_metrics_window);
-}
-
-}

src/gui/MainWindow.hpp

@@ -1,47 +0,0 @@
-#pragma once
-
-#include <SDL.h>
-#include <imgui.h>
-#include "../common/std.hpp"
-#include "../common/time.hpp"
-#include "../resources/resources.hpp"
-#include "../resources/fonts.hpp"
-
-/// converts hex color to float vector
-#define RGBAHexToF(R8,G8,B8,A8) ImVec4(((u8)35)/255.0f, ((u8)35)/255.0f, ((u8)50)/255.0f, ((u8)255)/255.0f)
-/// converts float vector to hex color
-#define RGBAFToHex(VEC4) {(u8)(VEC4.x*255), (u8)(VEC4.y*255), (u8)(VEC4.z*255), (u8)(VEC4.w*255)}
-
-namespace ougge::gui {
-
-#define default_font_path "fonts/DroidSans.ttf"
-
-class MainWindow {
-public:
-    i32 fps_max = 60;
-    f32 default_font_size = 14.0f;
-    ImVec4 clear_color = RGBAHexToF(35,35,50,255);
-    SDL_Window* sdl_window = nullptr;
-    SDL_Renderer* sdl_renderer = nullptr;
-
-private:
-    bool show_debug_window = true;
-    bool show_demo_window = false;
-    bool show_metrics_window = false;
-
-public:
-    void open(const std::string& window_title, resources::ResourceManager& resourceManager);
-    void close();
-
-    /// process io events happened since previous frame
-    void pollEvents(bool* loopRunning);
-    void beginFrame();
-    void endFrame();
-
-    f32 getDPI();
-private:
-    void draw_debug_window();
-    void draw_bg_window();
-};
-
-}

src/gui/gui.hpp

@@ -1,11 +0,0 @@
-#pragma once
-
-#include <SDL.h>
-#include <imgui.h>
-#include "gui_exceptions.hpp"
-
-namespace ougge::gui {
-
-void drawErrorWindow(const std::string& msg, bool* draw_error_window);
-
-}

src/main.cpp

@@ -1,49 +1,67 @@
 #define SDL_MAIN_HANDLED
 #include <iostream>
 #include <iomanip>
-#include "common/UsefulException.hpp"
-#include "common/ougge_format.hpp"
 #include "Engine.hpp"
-#include "gui/gui.hpp"
+#include "modules/MainWindowSDL2.hpp"
+#include "modules/MonoGameObjectSystem.hpp"
+#include "resources/textures.hpp"
 
 using namespace ougge;
 
-void drawTutel(Engine& engine){
-    resources::Texture* tutel = engine.textures.tryGetOrCreate("tutel.png", engine.mainWindow.sdl_renderer);
+class TutelModule : public IEngineModule {
+    resources::CacheStorage<resources::Texture> textures;
+public:
+    TutelModule(Engine& engine, resources::ResourceManager& resourceManager) :
+        IEngineModule(engine),
+        textures(&resourceManager)
+    {
+        //TODO: add something like `assert(requireModule(MainWindow))`
+    }
+
+    const std::string& getName() override {
+        return ougge_type_name<TutelModule>();
+    }
+
+    void beginFrame() override {
+        auto& mainWindow = engine.getModule<modules::MainWindowSDL2>();
+        resources::Texture* tutel = textures.tryGetOrCreate("tutel.png", mainWindow.sdl_renderer);
         if(tutel == nullptr){
             throw new UsefulException("couldn't find resource 'tutel.png'");
         }
         resources::SDL_RenderCopyExF_Params params;
         params.target_section = SDL_FRectConstruct(100, 100, 400, 400);
         static i32 si = 1;
-    params.rotation_angle = M_PI_4 * (si++ / engine.mainWindow.fps_max);
+        params.rotation_angle = M_PI_4 * (si++ / engine.fps_max);
         tutel->render(params);
+    }
+
+};
+
+void createExampleObject(Engine& engine){
+    std::cout<<"creating ExampleObject"<<std::endl;
+    auto& monoSystem = engine.getModule<modules::MonoGameObjectSystem>();
+    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()));
 }
 
 int main(int argc, const char** argv){
     try {
-        std::cout<<"initialized resource loader"<<std::endl;
-        
+        std::cout<<"Initializing Engine"<<std::endl;
         Engine engine;
-        std::cout<<"initialized mono jit runtime"<<std::endl;
-        engine.init();
-        std::cout<<"initialized game engine"<<std::endl;
 
-        game::GameObject& exampleObj = engine.createGameObject();
-        std::string componentClassName = "Ougge.ExampleComponent";
-        if(!engine.tryCreateComponent(exampleObj, componentClassName))
-            throw UsefulException(ougge_format("couldn't create component '%s'", componentClassName.c_str()));
+        std::cout<<"Initializing ResourceManager"<<std::endl;
+        resources::ResourceManager resourceManager;
 
-        std::cout<<"created ExampleObject"<<std::endl;
+        engine.createModule<modules::MainWindowSDL2>("ougge", resourceManager);
+        engine.createModule<modules::MonoGameObjectSystem>(64*1024);
+        createExampleObject(engine);
+        engine.createModule<TutelModule>(resourceManager);
         
-        engine.updateCallback = [&engine](f64 deltaTime) -> void {
-            drawTutel(engine);
-        };
-        
-        engine.openMainWindow("ougge");
-        std::cout<<"created sdl window"<<std::endl;
+        std::cout<<"main loop start"<<std::endl;
         engine.startLoop();
-        std::cout<<"sdl window has been cosed"<<std::endl;
+        std::cout<<"main loop stop"<<std::endl;
     }
     catch(const std::exception& e){
         std::cerr<<"Catched exception: "<<e.what()<<std::endl;

src/modules/MainWindowSDL2.cpp

@@ -1,14 +1,20 @@
 #include <backends/imgui_impl_sdl2.h>
 #include <backends/imgui_impl_sdlrenderer2.h>
 #include <iostream>
-#include "MainWindow.hpp"
-#include "gui_exceptions.hpp"
+#include "MainWindowSDL2.hpp"
+#include "../gui/gui_exceptions.hpp"
 #include "../common/ougge_format.hpp"
 #include "../common/math.hpp"
 
-namespace ougge::gui {
+using namespace ougge::gui;
 
-f32 MainWindow::getDPI(){
+namespace ougge::modules {
+
+const std::string& MainWindowSDL2::getName() {
+    return ougge_type_name<MainWindowSDL2>();
+}
+
+f32 MainWindowSDL2::getDPI(){
     i32 w=0, h=0;
     SDL_GetRendererOutputSize(sdl_renderer, &w, &h);
     i32 sim_w=0, sim_h=0;
@@ -19,7 +25,11 @@ f32 MainWindow::getDPI(){
     return dpi;
 }
 
-void MainWindow::open(const std::string& window_title, resources::ResourceManager& resourceManager){
+MainWindowSDL2::MainWindowSDL2(Engine& engine,
+        const std::string& window_title,
+        resources::ResourceManager& resourceManager)
+    : IEngineModule(engine)
+{
     SDL_TRY(SDL_Init(SDL_INIT_EVERYTHING));
     SDL_version v;
     SDL_GetVersion(&v);
@@ -78,7 +88,7 @@ void MainWindow::open(const std::string& window_title, resources::ResourceManage
     io.FontDefault = resources::ImFont_LoadFromResource(font_res, default_font_size, dpi);
 }
 
-void MainWindow::close(){
+MainWindowSDL2::~MainWindowSDL2(){
     ImGui_ImplSDLRenderer2_Shutdown();
     ImGui_ImplSDL2_Shutdown();
     ImGui::DestroyContext();
@@ -87,20 +97,22 @@ void MainWindow::close(){
     SDL_Quit();
 }
 
-void MainWindow::pollEvents(bool* loopRunning){
+void MainWindowSDL2::pollEvents(){
     SDL_Event event;
     while (SDL_PollEvent(&event)) {
         ImGui_ImplSDL2_ProcessEvent(&event);
         switch(event.type){
             case SDL_QUIT: {
-                *loopRunning = false;
+                //TODO: log SDL_QUIT event
+                engine.stopLoop();
                 break;
             }
             case SDL_WINDOWEVENT: {
                 if(event.window.event == SDL_WINDOWEVENT_CLOSE 
                     && event.window.windowID == SDL_GetWindowID(sdl_window))
                 {
-                    *loopRunning = false;
+                    //TODO: log SDL_WINDOWEVENT event
+                    engine.stopLoop();
                 }
                 break;
             }
@@ -108,8 +120,10 @@ void MainWindow::pollEvents(bool* loopRunning){
     }
 }
 
+void MainWindowSDL2::beginFrame(){
+    // process events happend since previous frame
+    pollEvents();
 
-void MainWindow::beginFrame(){
     // Start the Dear ImGui frame
     ImGui_ImplSDLRenderer2_NewFrame();
     ImGui_ImplSDL2_NewFrame();
@@ -126,16 +140,17 @@ void MainWindow::beginFrame(){
 
     draw_bg_window();
     draw_debug_window();
+    drawErrorWindow();
 }
 
-void MainWindow::endFrame(){
+void MainWindowSDL2::endFrame(){
     ImGui::Render();
     ImGui_ImplSDLRenderer2_RenderDrawData(ImGui::GetDrawData(), sdl_renderer);
     // Swap buffers
     SDL_RenderPresent(sdl_renderer);
 }
 
-void MainWindow::draw_bg_window(){
+void MainWindowSDL2::draw_bg_window(){
     const ImGuiDockNodeFlags dockspace_flags =
             ImGuiDockNodeFlags_PassthruCentralNode;
     const ImGuiWindowFlags window_flags =
@@ -199,11 +214,11 @@ void MainWindow::draw_bg_window(){
     ImGui::End();
 }
 
-void MainWindow::draw_debug_window(){
+void MainWindowSDL2::draw_debug_window(){
     ImGuiIO& io = ImGui::GetIO();
     if(ImGui::Begin("Debug Options", &show_debug_window)){
         ImGui::ColorEdit3("clear_color", (float*)&clear_color);
-        ImGui::InputInt("fps_max", &fps_max);
+        ImGui::InputInt("fps_max", (int*)&engine.fps_max);
         ImGui::Text("Application average %.3f ms/frame (%.2f FPS)", 1000.0f / io.Framerate, io.Framerate);
         ImGui::Checkbox("Demo Window", &show_demo_window);
         ImGui::Checkbox("Metrics/Debug Window", &show_metrics_window);
@@ -217,4 +232,16 @@ void MainWindow::draw_debug_window(){
         ImGui::ShowMetricsWindow(&show_metrics_window);
 }
 
+void MainWindowSDL2::drawErrorWindow(){
+    if(engine.error_messages.size() < 1)
+        return;
+    ImGui::Begin("ERRORS");
+        if(ImGui::Button("Clear"))
+            engine.error_messages.clear();
+        for(auto& msg : engine.error_messages){
+            ImGui::TextWrapped("%s", msg.c_str());
+        }
+    ImGui::End();
+}
+
 }

src/modules/MainWindowSDL2.hpp

@@ -2,23 +2,23 @@
 
 #include <SDL.h>
 #include <imgui.h>
+#include <vector>
 #include "../common/std.hpp"
-#include "../common/time.hpp"
 #include "../resources/resources.hpp"
 #include "../resources/fonts.hpp"
+#include "../Engine.hpp"
+
+namespace ougge::modules {
 
 /// converts hex color to float vector
 #define RGBAHexToF(R8,G8,B8,A8) ImVec4(((u8)35)/255.0f, ((u8)35)/255.0f, ((u8)50)/255.0f, ((u8)255)/255.0f)
 /// converts float vector to hex color
 #define RGBAFToHex(VEC4) {(u8)(VEC4.x*255), (u8)(VEC4.y*255), (u8)(VEC4.z*255), (u8)(VEC4.w*255)}
 
-namespace ougge::gui {
-
 #define default_font_path "fonts/DroidSans.ttf"
 
-class MainWindow {
+class MainWindowSDL2 : public IEngineModule {
 public:
-    i32 fps_max = 60;
     f32 default_font_size = 14.0f;
     ImVec4 clear_color = RGBAHexToF(35,35,50,255);
     SDL_Window* sdl_window = nullptr;
@@ -30,18 +30,20 @@ private:
     bool show_metrics_window = false;
 
 public:
-    void open(const std::string& window_title, resources::ResourceManager& resourceManager);
-    void close();
+    MainWindowSDL2(Engine& engine, const std::string& window_title,
+        resources::ResourceManager& resourceManager);
+    ~MainWindowSDL2();
 
-    /// process io events happened since previous frame
-    void pollEvents(bool* loopRunning);
-    void beginFrame();
-    void endFrame();
+    const std::string& getName() override;
+    void beginFrame() override;
+    void endFrame() override;
 
     f32 getDPI();
 private:
+    void pollEvents();
     void draw_debug_window();
     void draw_bg_window();
+    void drawErrorWindow();
 };
 
 }

src/modules/MonoGameObjectSystem.cpp

@@ -0,0 +1,76 @@
+#include "MonoGameObjectSystem.hpp"
+
+namespace ougge::modules {
+
+const std::string& MonoGameObjectSystem::getName() {
+    return ougge_type_name<MonoGameObjectSystem>();
+}
+
+MonoGameObjectSystem::MonoGameObjectSystem(Engine& engine, u32 max_game_objects) :
+    IEngineModule(engine), 
+    gameObjectPool(max_game_objects)
+{
+    engineManagedAssembly = mono.loadAssembly("Ougge.dll");
+    gameObjectClass = engineManagedAssembly->getClass("Ougge", "GameObject");
+    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){
+
+        auto obj = pair.second.getObjectHandle().getObject();
+        std::cout<<"updating obj: "<<obj<<std::endl;
+        gameObjectInvokeUpdate(obj, engine.deltaTime);
+    }
+}
+
+// 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;
+    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;
+}
+
+bool MonoGameObjectSystem::tryCreateComponent(game::GameObject& obj, const std::string& componentClassName){
+    Mono::String componentClassNameManaged = mono.createString(componentClassName);
+    Mono::Bool created = gameObjectTryCreateComponent(obj.getObjectHandle().getObject(), componentClassNameManaged);
+    return created.wide_bool;
+}
+
+}

src/modules/MonoGameObjectSystem.hpp

@@ -0,0 +1,35 @@
+#pragma once
+
+#include "../Engine.hpp"
+#include "../common/function_shared_ptr.hpp"
+#include "../mono/mono.hpp"
+#include "../game/GameObjectPool.hpp"
+
+namespace ougge::modules {
+
+class MonoGameObjectSystem : public IEngineModule {
+    Mono::RuntimeJIT mono;
+    game::GameObjectPool gameObjectPool;
+    u64 obj_id = 0;
+    MonoClass* gameObjectClass;
+    Mono::Method<void(u64, u32)> gameObjectCtor;
+    Mono::Method<void(f64)> gameObjectInvokeUpdate;
+    Mono::Method<Mono::Bool(Mono::String)> gameObjectTryCreateComponent;
+
+public:
+    std::shared_ptr<Mono::Assembly> engineManagedAssembly;
+
+    MonoGameObjectSystem(Engine& engine, u32 max_game_objects);
+    
+    const std::string& getName() override;
+    void beginFrame() override;
+    
+    game::GameObject& createAndConstructGameObject();
+    bool tryCreateComponent(game::GameObject& obj, const std::string& componentClassName);
+
+private:
+    void registerNativeCallbacks();
+    game::GameObject& createGameObjectInPool(u64* id_out, u32* index_out);
+};
+
+}

src/resources/MemorySteam.cpp

@@ -4,10 +4,10 @@ class MemoryStreamBuf : public std::streambuf {
 public:
     MemoryStreamBuf(void* p, const std::size_t n);
 
-    virtual std::istream::pos_type seekoff(
+    std::istream::pos_type seekoff(
         std::istream::off_type off,
         std::ios_base::seekdir dir,
-        std::ios_base::openmode which);
+        std::ios_base::openmode which) override;
 };
 
 MemoryStreamBuf::MemoryStreamBuf(void* _p, const std::size_t n){

src/resources/resources.hpp

@@ -23,6 +23,7 @@ public:
 
 using ResourceMap = std::unordered_map<std::string, ResourceFactory>;
 
+//TODO: rewrite ResourceManager as a module
 class ResourceManager {
     std::list<std::shared_ptr<ResourceMap>> _resourceMaps;
     static std::shared_ptr<ResourceMap> _embeddedResourcesMap;