Keepin' it moving (Windows)

//--Includes--//
int main ( int argc , char* argv [] )
{
    boost::thread win_thread(WindowThread);

    //Wait for Window to be ready
    while (!win_ready) {win_thread.yield();};

    StartUp();

    while (!quit_flag) {
        GameLoop();
    }

    ShutDown();

    win_thread.join();
    return ( 0 ) ;
}

void StartUp() {
    //--Graphics--//
    PIXELFORMATDESCRIPTOR pfd;
    memset(&pfd, 0, sizeof(pfd));

    pfd.nSize = sizeof(pfd);
    pfd.nVersion = 1;
    pfd.dwFlags = PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER | PFD_GENERIC_ACCELERATED;
    pfd.iPixelType = PFD_TYPE_RGBA;
    pfd.cColorBits = 32;
    pfd.cRedBits = 8;
    pfd.cBlueBits = 8;
    pfd.cGreenBits = 8;
    pfd.cAlphaBits = 8;
    pfd.cDepthBits = 16;
    pfd.iLayerType = PFD_MAIN_PLANE;

    int format_id = ChoosePixelFormat(win_hdc, &pfd);

    SetPixelFormat(win_hdc, format_id, &pfd);

    gl_cont = wglCreateContext(win_hdc);
    wglMakeCurrent(win_hdc, gl_cont);

    //Set up projection
    glViewport(0, 0, 640, 480);

    glMatrixMode(GL_PROJECTION);                // Select The Projection Matrix
    glLoadIdentity();                            // Reset The Projection Matrix

    // Calculate The Aspect Ratio Of The Window
    gluPerspective(45.0f,(GLfloat)640/(GLfloat)480,0.1f,100.0f);

    glMatrixMode(GL_MODELVIEW);                    // Select The Modelview Matrix
    glLoadIdentity();                
}

void ShutDown() {
    wglDeleteContext(gl_cont);
}

void GameLoop() {
        //Clear the Screen
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glLoadIdentity();
        glTranslatef(0.0f,0.0f,-5.0f);
        glRotatef(r_angle, 1.0f, 0.0f, 0.0f);
        glRotatef(r_angle, 0.0f, 1.0f, 0.0f);
        glRotatef(r_angle, 0.0f, 0.0f, 1.0f);
                
        //Draw triangle
        glColor3f(1.0,1.0,1.0);
        glBegin(GL_TRIANGLES);                        // Drawing Using Triangles
            glVertex3f( 1.0f, -1.0f, 0.0f);                // Top
            glVertex3f(-1.0f,-1.0f, 0.0f);                // Bottom Left
            glVertex3f( 0.0f,1.0f, 0.0f);                // Bottom Right
        glEnd();    

        r_angle += 0.1f;

        //Present
        SwapBuffers(win_hdc);
        //Wait a bit
        boost::thread dummy;
        dummy.yield();
}

void WindowThread () {
    //--Create Window Class--//
    WNDCLASSEX win_class;
    memset(&win_class, 0, sizeof(win_class));

    win_class.cbSize = sizeof(win_class);
    win_class.style = NULL;
    win_class.lpfnWndProc = WinProc;
    win_class.cbClsExtra = 0;
    win_class.cbWndExtra = 0;
    win_class.hInstance = app_inst;
    win_class.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    win_class.hCursor = LoadCursor(NULL, IDC_ARROW);
    win_class.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
    win_class.lpszMenuName = NULL;
    win_class.lpszClassName = "RPG Demo";
    win_class.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

    //Register class
    if (!RegisterClassEx(&win_class))
        throw runtime_error("Failed to register Window Class");

    //--Create Window--//
    RECT win_rect;
    win_rect.left = 0;
    win_rect.top = 0;
    win_rect.right = win_width;
    win_rect.bottom = win_height;
    
    //For Windowed
    DWORD dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;
    DWORD dwStyle = WS_OVERLAPPEDWINDOW;

    AdjustWindowRectEx(&win_rect, dwStyle, FALSE, dwExStyle);

    if (!(win_handle = CreateWindowEx(0,                  // extended style
                                "RPG Demo",     // class
                                "RPG Demo - www.liztail.com", // title
                                dwStyle | WS_VISIBLE,
                                 0, 0,      // initial x,y
                                win_rect.right - win_rect.left, win_rect.bottom - win_rect.top,  // initial width, height
                                0,      // handle to parent
                                0,      // handle to menu
                                app_inst,// instance of this application
                                0)))    // extra creation parms
        throw runtime_error("Failed to create Window");
    
    //Get DC
    win_hdc = GetDC(win_handle);

    win_ready = true;

    //--Event Loop--//
    MSG    msg;
    while(true) {
        while (PeekMessage(&msg,NULL,0,0,PM_REMOVE)) {
            if (msg.message==WM_QUIT) {
                // Quit Message
                quit_flag = true;
                return;
            }
            else {
                //Default Processing
                TranslateMessage(&msg);                // Translate The Message
                DispatchMessage(&msg);                // Dispatch The Message
            }
            boost::thread dummy;
            dummy.yield();
        }
    }
}