move towards explicit handle type in P3D_window_handle

direct/src/plugin/p3dWindowParams.I

@@ -84,7 +84,7 @@ get_win_height() const {
 //  Description: Returns the parent window handle that was passed to
 //               the constructor.
 ////////////////////////////////////////////////////////////////////
-inline P3D_window_handle P3DWindowParams::
+inline const P3D_window_handle &P3DWindowParams::
 get_parent_window() const {
   return _parent_window;
 }

direct/src/plugin/p3dWindowParams.cxx

@@ -88,7 +88,8 @@ make_xml(P3DInstance *inst) {
     // stringstream to do it ourselves.
     {
       ostringstream strm;
-      strm << _parent_window._xwindow;
+      assert(_parent_window._window_handle_type == P3D_WHT_x11_window);
+      strm << _parent_window._handle._x11_window._xwindow;
       xwparams->SetAttribute("parent_xwindow", strm.str());
     }
 #endif

direct/src/plugin/p3dWindowParams.h

@@ -41,7 +41,7 @@ public:
   inline int get_win_y() const;
   inline int get_win_width() const;
   inline int get_win_height() const;
-  inline P3D_window_handle get_parent_window() const;
+  inline const P3D_window_handle &get_parent_window() const;
 
   TiXmlElement *make_xml(P3DInstance *inst);
 

direct/src/plugin/p3dX11SplashWindow.cxx

@@ -805,7 +805,9 @@ make_window() {
 
   if (_wparams.get_window_type() == P3D_WT_embedded) {
     // Create an embedded window.
-    parent = _wparams.get_parent_window()._xwindow;
+    const P3D_window_handle &handle = _wparams.get_parent_window();
+    assert(handle._window_handle_type == P3D_WHT_x11_window);
+    parent = handle._handle._x11_window._xwindow;
   } else {
     // Create a toplevel window.
     parent = XRootWindow(_display, _screen);

direct/src/plugin/p3d_plugin.h

@@ -197,20 +197,44 @@ typedef struct {
   /* Additional opaque data may be stored here. */
 } P3D_instance;
 
-/* This structure abstracts out the various window handle types for
+/* This enum and set of structures abstract out the various window
-   the different platforms. */
+   handle types for the different platforms. */
+
+typedef enum {
+  P3D_WHT_none,
+  P3D_WHT_win_hwnd,
+  P3D_WHT_osx_port,
+  P3D_WHT_x11_window,
+} P3D_window_handle_type;
+
 typedef struct {
 #ifdef _WIN32
   HWND _hwnd;
+#endif
+} P3D_window_handle_win_hwnd;
 
-#elif defined(__APPLE__)
+  /* As provided by Mozilla, by default.  Not compatible with Snow
-  /* As provided by Mozilla. */
+     Leopard. */
+typedef struct {
+#if defined(__APPLE__)
   GrafPtr _port;
+#endif
+} P3D_window_handle_osx_port;
 
-#elif defined(HAVE_X11)
+typedef struct {
+#if defined(HAVE_X11)
   unsigned long _xwindow;
   void *_xdisplay;
 #endif
+} P3D_window_handle_x11_window;
+
+typedef struct {
+  P3D_window_handle_type _window_handle_type;
+  union {
+    P3D_window_handle_win_hwnd _win_hwnd;
+    P3D_window_handle_osx_port _osx_port;
+    P3D_window_handle_x11_window _x11_window;
+  } _handle;
 } P3D_window_handle;
 
 /* This enum lists the different kinds of window types that may be

direct/src/plugin_npapi/ppInstance.cxx

@@ -1292,6 +1292,9 @@ send_window() {
   int y = _window.y;
 
   P3D_window_handle parent_window;
+  memset(&parent_window, 0, sizeof(parent_window));
+  parent_window._window_handle_type = P3D_WHT_none;
+
   if (_window.type == NPWindowTypeWindow) {
     // We have a "windowed" plugin.  Parent our window to the one we
     // were given.  In this case, we should also reset the offset to
@@ -1314,7 +1317,8 @@ send_window() {
 #elif defined(HAVE_X11)
     // We make it an 'unsigned long' instead of 'Window'
     // to avoid nppanda3d.so getting a dependency on X11.
-    parent_window._xwindow = (unsigned long)(_window.window);
+    parent_window._window_handle_type = P3D_WHT_x11_window;
+    parent_window._handle._x11_window._xwindow = (unsigned long)(_window.window);
     x = 0;
     y = 0;
 #endif
@@ -1340,22 +1344,22 @@ send_window() {
     */
 
 #elif defined(HAVE_X11)
-    parent_window._xwindow = 0;
     unsigned long win;
     if (browser->getvalue(_npp_instance, NPNVnetscapeWindow,
                           &win) == NPERR_NO_ERROR) {
-      parent_window._xwindow = win;
+      parent_window._window_handle_type = P3D_WHT_x11_window;
+      parent_window._handle._x11_window._xwindow = win;
     }
 #endif
   }
 
 #ifdef HAVE_X11
   // In the case of X11, grab the display as well.
-  parent_window._xdisplay = 0;
+  parent_window._handle._x11_window._xdisplay = 0;
   void *disp;
   if (browser->getvalue(_npp_instance, NPNVxDisplay,
                         &disp) == NPERR_NO_ERROR) {
-    parent_window._xdisplay = disp;
+    parent_window._handle._x11_window._xdisplay = disp;
   }
 #endif