implemented createModule() and getModule()

src/Engine.cpp

@@ -7,19 +7,14 @@
 
 namespace ougge {
 
-EngineModule::EngineModule(Engine& engine, const std::string& name)
-    : engine(engine), name(name) 
+IEngineModule::IEngineModule(Engine& engine)
+    : engine(engine)
 {}
 
-void EngineModule::beginFrame() {}
-void EngineModule::endFrame() {}
+void IEngineModule::beginFrame() {}
+void IEngineModule::endFrame() {}
 
 
-
-void Engine::addModule(EngineModule* m){
-    modules.push_back(m);
-}
-
 void Engine::startLoop()
 {
     if(loop_running)
@@ -50,10 +45,10 @@ void Engine::stopLoop(){
     loop_running = false;
 }
 
-void Engine::handleModuleError(EngineModule* module, const char* type, const char* method, const char* error){
+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->name.c_str(), method, error);
+        type, module.getName(), method, error);
     std::cerr<<error_message<<std::endl;
     error_messages.push_back(error_message);
 }
@@ -62,10 +57,10 @@ void Engine::tryDrawFrame(){
     auto it = modules.begin();
     while(it != modules.end())
     {
-        EngineModule* module = *it;
+        IEngineModule& module = **it;
         it++;
         try {
-            module->beginFrame();
+            module.beginFrame();
         }
         catch(const std::exception& e){
             handleModuleError(module, "exception", "beginFrame", e.what());
@@ -81,17 +76,13 @@ void Engine::tryDrawFrame(){
         }
     }
 
-    //TODO: frame expeption display
-    // if(draw_error_window)
-    //     gui::drawErrorWindow(error_message, &draw_error_window);
-
     it = modules.end();
     while(it != modules.begin())
     {
         it--;
-        EngineModule* module = *it;
+        IEngineModule& module = **it;
         try {
-            module->endFrame();
+            module.endFrame();
         }
         catch(const std::exception& e){
             handleModuleError(module, "exception", "endFrame", e.what());

src/Engine.hpp

@@ -4,32 +4,36 @@
 #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 {
 
 class Engine;
 
-class EngineModule {
+class IEngineModule {
 public:
-    EngineModule() = delete;
-    EngineModule(const EngineModule&) = delete;
-    EngineModule& operator=(const EngineModule&) = delete;
-    EngineModule(EngineModule&&) = delete;
-    EngineModule& operator=(EngineModule&&) = delete;
+    IEngineModule() = delete;
+    IEngineModule(const IEngineModule&) = delete;
+    IEngineModule& operator=(const IEngineModule&) = delete;
+    IEngineModule(IEngineModule&&) = delete;
+    IEngineModule& operator=(IEngineModule&&) = delete;
 
     Engine& engine;
-    const std::string name;
+    virtual const std::string& getName() = 0;
 
     virtual void beginFrame();
     virtual void endFrame();
 
 protected:
-    EngineModule(Engine& engine, const std::string& name);
+    IEngineModule(Engine& engine);
 };
 
 
 class Engine {
-    std::vector<EngineModule*> modules;
+    std::vector<std::unique_ptr<IEngineModule>> modules;
     bool loop_running = false;
 
 public:
@@ -43,14 +47,60 @@ public:
     Engine(Engine&&) = delete;
     Engine& operator=(Engine&&) = delete;
 
-    void addModule(EngineModule* m);
-
     // start game loop on the current thread
     void startLoop();
     void stopLoop();
 
+    //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();
-    void handleModuleError(EngineModule *module, const char *type, const char *method, const char *error);
+    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/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

@@ -35,6 +35,7 @@ public:
     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/main.cpp

@@ -8,18 +8,22 @@
 
 using namespace ougge;
 
-class TutelModule : public EngineModule {
+class TutelModule : public IEngineModule {
     resources::CacheStorage<resources::Texture> textures;
-    modules::MainWindowSDL2& mainWindow;
 public:
-    TutelModule(Engine& engine, resources::ResourceManager& resourceManager, modules::MainWindowSDL2& mainWindow) :
-        EngineModule(engine, nameof(TutelModule)),
-        textures(&resourceManager),
-        mainWindow(mainWindow)
+    TutelModule(Engine& engine, resources::ResourceManager& resourceManager) :
+        IEngineModule(engine),
+        textures(&resourceManager)
     {
+        //TODO: add something like `assert(requireModule(MainWindow))`
     }
 
-    virtual void beginFrame(){
+    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'");
@@ -33,31 +37,27 @@ public:
 
 };
 
+void createExampleObject(Engine& engine){
+    std::cout<<"creating ExampleObject"<<std::endl;
+    auto& monoSystem = engine.getModule<modules::MonoGameObjectSystem>();
+    game::GameObject& exampleObj = monoSystem.createGameObject();
+    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<<"initializing ResourceManager";
-        resources::ResourceManager resourceManager;
-
-        std::cout<<"initializing Engine";
+        std::cout<<"Initializing Engine"<<std::endl;
         Engine engine;
 
-        std::cout<<"initializing MainWindowSDL2"<<std::endl;
-        modules::MainWindowSDL2 mainWindow (engine, "ougge", resourceManager);
-        engine.addModule(&mainWindow);
+        std::cout<<"Initializing ResourceManager"<<std::endl;
+        resources::ResourceManager resourceManager;
 
-        std::cout<<"initializing MonoGameObjectSystem"<<std::endl;
-        modules::MonoGameObjectSystem monoSystem (engine, 64*1024);
-        engine.addModule(&monoSystem);
-
-        std::cout<<"createing ExampleObject"<<std::endl;
-        game::GameObject& exampleObj = monoSystem.createGameObject();
-        std::string componentClassName = "Ougge.ExampleComponent";
-        if(!monoSystem.tryCreateComponent(exampleObj, componentClassName))
-            throw UsefulException(ougge_format("couldn't create component '%s'", componentClassName.c_str()));
-        
-        std::cout<<"initializing TutelModule"<<std::endl;
-        TutelModule tutel (engine, resourceManager, mainWindow);
-        engine.addModule(&tutel);
+        engine.createModule<modules::MainWindowSDL2>("ougge", resourceManager);
+        engine.createModule<modules::MonoGameObjectSystem>(64*1024);
+        createExampleObject(engine);
+        engine.createModule<TutelModule>(resourceManager);
         
         std::cout<<"main loop start"<<std::endl;
         engine.startLoop();

src/modules/MainWindowSDL2.cpp

@@ -10,6 +10,10 @@ using namespace ougge::gui;
 
 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);
@@ -24,7 +28,7 @@ f32 MainWindowSDL2::getDPI(){
 MainWindowSDL2::MainWindowSDL2(Engine& engine,
         const std::string& window_title,
         resources::ResourceManager& resourceManager)
-    : EngineModule(engine, nameof(MainWindowSDL2))
+    : IEngineModule(engine)
 {
     SDL_TRY(SDL_Init(SDL_INIT_EVERYTHING));
     SDL_version v;

src/modules/MainWindowSDL2.hpp

@@ -17,7 +17,7 @@ namespace ougge::modules {
 
 #define default_font_path "fonts/DroidSans.ttf"
 
-class MainWindowSDL2 : public EngineModule {
+class MainWindowSDL2 : public IEngineModule {
 public:
     f32 default_font_size = 14.0f;
     ImVec4 clear_color = RGBAHexToF(35,35,50,255);
@@ -34,8 +34,9 @@ public:
         resources::ResourceManager& resourceManager);
     ~MainWindowSDL2();
 
-    virtual void beginFrame();
-    virtual void endFrame();
+    const std::string& getName() override;
+    void beginFrame() override;
+    void endFrame() override;
 
     f32 getDPI();
 private:

src/modules/MonoGameObjectSystem.cpp

@@ -2,8 +2,12 @@
 
 namespace ougge::modules {
 
+const std::string& MonoGameObjectSystem::getName() {
+    return ougge_type_name<MonoGameObjectSystem>();
+}
+
 MonoGameObjectSystem::MonoGameObjectSystem(Engine& engine, u32 max_game_objects) :
-    EngineModule(engine, nameof(MonoGameObjectSystem)), 
+    IEngineModule(engine), 
     gameObjectPool(max_game_objects)
 {
     engineManagedAssembly = mono.loadAssembly("Ougge.dll");

src/modules/MonoGameObjectSystem.hpp

@@ -7,7 +7,7 @@
 
 namespace ougge::modules {
 
-class MonoGameObjectSystem : public EngineModule {
+class MonoGameObjectSystem : public IEngineModule {
     Mono::RuntimeJIT mono;
     game::GameObjectPool gameObjectPool;
     u64 obj_id = 0;
@@ -21,7 +21,8 @@ public:
 
     MonoGameObjectSystem(Engine& engine, u32 max_game_objects);
     
-    virtual void beginFrame();
+    const std::string& getName() override;
+    void beginFrame() override;
     
     game::GameObject& createGameObject();
     bool tryCreateComponent(game::GameObject& obj, const std::string& componentClassName);

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;