Change in window implementation in Max 6 (Mac OS X)

    Nov 07 2011 | 11:05 pm
    I have been using
    mess1( patcherview, gensym( "nativewindow" ), (void **)&viewWindow );
    to get access to the native patcher window reference.
    It used to return a WindowRef referring to a window implementing an HIView hierarchy. It appears that this has changed in Max6 as any HIView related calls I make fail
    -50 - paramErr or
    -5600 - errInvalidWindowRef
    I have been using this to embed an OpenGL context in the patcher window directly to create a video display object (for softVNS, not jitter).
    What kind of structure or object am I now getting back from this native window message?
    Is there now in Max6 a sanctioned and documented way of embedding a custom OpenGL context in a patcher?

    • Nov 07 2011 | 11:30 pm
      Hi David,
      Max6 is Cocoa all the way on OSX. "nativewindow" is now giving you back an NSView *. Use this to convert it to a WindowRef:
      WindowRef jit_gl_cocoa_windowref_from_nsview(NSView *view)
             WindowRef ref=NULL;
             if (view) {
                     NSWindow *win = [view window];
                     if (win) {
                             ref = [win windowRef];
             return ref;
    • Nov 08 2011 | 10:17 am
      i guess that has to be done in a .m file cause it uses ObjectiveC. correct?
    • Nov 08 2011 | 11:38 am
      Thanks Wesley,
      That helps a lot.
      I had to work around the fact that the titlebar is now included in the frame of the windowRef which messed up my positioning, but I fixed that.
      This brings up a second and somewhat separate question: How can I get an appropriate clipping rectangle for the patching area of the window so that my OpenGL context does not spill into the bottom bar or inspector area on the right?
    • Nov 08 2011 | 11:50 am
      Yes, @Oli, a .m (or .mm) file is the recommended way for Objective-C. There are other ways of forcing the compiler to make it work, but my experience is that those other ways always come back and bite you later on.
    • Nov 09 2011 | 2:19 am
      You have to listen for notifications from the patcherview. Use jpatcher_get_firstview to get the view and then use object_attach_byptr to get notifications. What you need to listen for are changed attributers on the patcherview and in your case, you need to list for the "rect" attribute.
      for a notification function that looks like:
      notify(t_jit_gl_window *x, void *sender, void *data) {
          if(msg == gensym("attr_modified")) {
              t_symbol *name = (t_symbol *)object_method((t_object *)data, gensym("getname"));
              if(name == gensym("rect")) {
                  double r[4] = {0., 0., 1., 1.};
      		// patcher comes from your object
      		object_attr_getdouble_array(patcher, gensym("rect"), 4, r);