librocket integration

#include "Engine.h"

Engine::Engine(){
    rocketContext = NULL;
    rockDoc = NULL;
}
void Engine::Start(const char* title, int width, int height, int bpp, bool fullscreen){
    int flags = 0;
    if (SDL_Init(SDL_INIT_EVERYTHING) == -1 )   { //turn on sdl
        printf("%s\n", SDL_GetError());
        return;
    }
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
    screen = NULL;
    if (fullscreen) {//turn on fullscreen
        flags = SDL_FULLSCREEN;
    } else {
        flags = SDL_OPENGL;
    }
    screen = SDL_SetVideoMode(width, height, bpp, flags);//create a screen surface to draw on
    GLSetup();
    SDL_WM_SetCaption(title, title);//set window title
    if (screen == NULL) {
        SDL_GetError();
        return;
    }
    SDL_EnableUNICODE( SDL_TRUE );
    SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
    InitSDLtoRocketKeymap();
    fullScreen = fullscreen;
    //-
    Rocket::Core::SetSystemInterface( &rocketSys );
    Rocket::Core::SetRenderInterface( &rocketRender );
    Rocket::Core::Initialise();
    Rocket::Controls::Initialise();
    rocketContext = Rocket::Core::CreateContext( "main", Rocket::Core::Vector2i(width, height) );
    if (Rocket::Debugger::Initialise(rocketContext) && Rocket::Debugger::SetContext(rocketContext))
        Rocket::Debugger::SetVisible(true);
    bool success = Rocket::Core::FontDatabase::LoadFontFace("interface/Delicious-Roman.otf");
    if( !success ) std::cout << "Failed to load font!" << std::endl;
    rockDoc = rocketContext->LoadDocument( "interface/test.rml" );
    rockDoc->Show();
    //--
    running = true;//go live

}

void Engine::GLSetup(){
    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_COLOR_ARRAY);
    glEnable(GL_BLEND);
    glEnable(GL_TEXTURE_2D);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, screen->w, screen->h, 0, -1, 1);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glClearColor( 0.2f, 0.2f, 0.2f, 1.0f );
}

void Engine::ChangeState(EngineState* state){
    if (!states.empty()){
        states.back()->Clean();
        states.pop_back();
    }
    states.push_back(state);
    states.back()->Start();
}
void Engine::PushState(EngineState* state){
    if (!states.empty()) {
        states.back()->Pause();
    }
    states.push_back(state);
    states.back()->Start();
}
void Engine::PopState(){
    if (!states.empty()) {
        states.back()->Clean();
        states.pop_back();
    }
    if (!states.empty())
        states.back()->Resume();
}

void Engine::HandleEvents(){
    states.back()->HandleEvents(this);
}

void Engine::Update(){
    states.back()->Update(this);
    rocketContext->Update();
}

void Engine::Draw(){
    states.back()->Draw(this);
    rocketContext->Render();
}

void Engine::Clean(){
    while (!states.empty()) {
        states.back()->Clean();
        states.pop_back();
    }
    rockDoc->RemoveReference();
    rocketContext->RemoveReference();
    Rocket::Core::Shutdown();
}

void Engine::Quit(){
    SDL_FreeSurface(screen);
}