wait for next mpkConfigFrameBegin()

if (first time)
    for each MPKChannel [of the window]
         invoke the channel's cull-init callback function
         invoke the channel's draw-init callback function
    end for
end if

invoke the window's draw-update callback function

for each MPKChannel [of the window]
    if ( in mono )
        for eye MPK_EYE_CYCLOP
            invoke the channel's cull-update callback function
            invoke the channel's draw-clear callback function
            invoke the channel's draw-update callback function
        end for
    else ( in stereo )
        for eye MPK_EYE_LEFT and eye MPK_EYE_RIGHT
            invoke the channel's cull-update callback function
            invoke the channel's draw-clear callback function
            invoke the channel's draw-update callback function
        end for
    end if
end for

synchronize mpkWindowSwapBuffers (through mpkConfigFrameEnd())

     invoke the config's windows initialization callback
     for each MPKChannel in the window
         invoke the config's channels initialization callback
     end for
     enter lifelong loop

     for each MPKChannel in the window
         invoke the config's channels exit callback
     end for
     invoke the config's windows exit callback

     #define IRND(a) ((int)((a)+.5))

     // compute first pixel position of the window
     window.pvp[0] = IRND(window.vp[0] * pipe.width);
     window.pvp[1] = IRND(window.vp[1] * pipe.height);

     // compute last pixel position of the window
     window.pvp[2] = IRND((window.vp[0]+window.vp[2]) * pipe.width);
     window.pvp[3] = IRND((window.vp[1]+window.vp[3]) * pipe.height);

     // compute window's dimension
     window.pvp[2] -= window.pvp[0];
     window.pvp[3] -= window.pvp[1];

     vp(1): [0.     0. 0.3333 1. ]    pvp(1): [0   0 427 1024]
     vp(2): [0.3333 0. 0.3333 1. ]    pvp(2): [427 0 426 1024]

     void initWindow( MPKWindow *w )
     {
         mpkWindowSetEventCB( w, MPK_WINDOW_EVENTCB_ANY, windowEvent );
         mpkWindowSetEventCB( w, MPK_WINDOW_EVENTCB_KEYBOARD, windowKB );
     }

     void windowEvent( MPKWindow *w, MPKEvent *event )
     {
         MPKEventXData *data = (MPKEventXData *)mpkEventGetData(event);
         switch ( data->x->type )
         {
             // Use my own event processing for these events
             case ClientMessage:
                 myProcessEvent( event );
                 break;

             // Use MPK event processing for other events, eg.
             // keyboard events.
             default:
                 mpkWindowProcessEvent( w, event );
         }
     }

     void windowKB( MPKWindow *w, MPKEvent *event )
     {
         // Will be invoked by MPK upon keyboard events
         MPKEventXData *data = (MPKEventXData *)mpkEventGetData(event);

         if ( data->keyboard.state == MPK_PRESS )
             printf( "key %d pressed\n", data->keyboard.key );
     }

     mpkWindowOpenDisplay( window );

     GLXFBConfig *fbconfig = mpkWindowChooseFBConfig( window, &n );
     mpkWindowSetFBConfig( window, fbconfig[0] );

     mpkWindowCreateDrawable( window );
     mpkWindowMapDrawable( window );

     mpkWindowDestroyDrawable( window );
     mpkWindowCloseDisplay( window );

     mpkWindowSetParent( window, NULL );
     mpkWindowSetScreen( window, 0 );
     mpkWindowSetFBConfig( window, NULL );

     MPKPipe *p = mpkWindowGetPipe(window);
     Display *display = XOpenDisplay( mpkPipeGetDisplayName(p) );

     mpkWindowSetDisplay( window, display );
     mpkWindowSetScreen( DefaultScreen(display) );

     mpkWindowUpdatePixelViewport( window );