class SceneIntro_model : public Model{
public:
    int loadMap32(){
       this->loadOBJ('texture.bmp');
       this->loadIMG('texture.bmp');
       //some calc
       this->rules();
    }
    int newJump(){
       //some math
    }
private
    int rules(){
       this->loadXML('mechanics.xml');
       //make some calcs
    }
}


class SceneIntro_view : public View{
public:
    int makeMap32(){
       //put objects, make the math happen
       //put the result of the calcs
       this->light();
    }
    int jump(){
       //put objects, make the math happen
       //put the result of the calcs
       this->light();
    }
private
    int light(){
       this->changecolor(bla bla bla);
       this->putLight(x,x,x,x,x);
    }
}


class SceneIntro_control : public Control{
    int index(){
        //This can be a function of the main Control like this->loadModel('name');
        this->model= new SceneIntro_model ();
        this->view= new SceneIntro_view ();


        this->model->loadMap32();
        if(this->controller(Press_X)){
            this->model->newJump();
            this->view->jump();
        }
        this->view->makeMap()
        this->view->render();
    }
}


class Router{
    Init(){
        SceneIntro_control *control;
	control = new SceneIntro_control ();
	control->index();
    }
}

enum Mode {
    Mode_intro,
    Mode_game,
}

struct IntroData { ... };

struct GameData {
    r32 pos_x;
    r32 pos_y;
    r32 vel_x;
    r32 vel_y;
};

void game_input( GameData* game ) {

    if ( input_justPressed( "jump" ) ) {
        game->vel_y = 10.0f;
    }
}

void game_simulate( GameData* game ) {

    game->pos_y += game->vel_y * deltaTime;
    game->vel_y += gravity * deltaTime;
}

void game_render( GameData* game ) {
    drawSprite( game->pos_x, game->pos_y );
}

int main( int argc, char** argv ) {
    
    bool running = true;
    Mode mode = Mode_intro;
    GameData gameData = { 0 };
    IntroData introData = { 0 };
    
    while ( running ) {
        
        switch ( mode ) {
            
            case Mode_intro: {
                
                intro_input( &introData );
                intro_simulate( &introData );
                intro_render( &introData );
                
            } break;
            
            case Mode_game: {
                
                game_input( &gameData );
                game_simulate( &gameData );
                game_render( &gameData );
                
            } break;
        }
    }
    
    return 0;
}