ddraw: Better simulate what 'GetVerticalBlankStatus' does on real hardware.

dlls/ddraw/ddraw_main.c

@@ -1067,7 +1067,8 @@ Main_DirectDraw_GetVerticalBlankStatus(LPDIRECTDRAW7 iface, LPBOOL status)
 {
     IDirectDrawImpl *This = (IDirectDrawImpl *)iface;
     TRACE("(%p)->(%p)\n",This,status);
-    *status = TRUE;
+    *status = This->fake_vblank;
+    This->fake_vblank = !This->fake_vblank;
     return DD_OK;
 }
 

dlls/ddraw/ddraw_private.h

@@ -114,6 +114,8 @@ struct IDirectDrawImpl
     DDPIXELFORMAT pixelformat;
     DWORD cur_scanline;
 
+    BOOL fake_vblank;
+    
     /* Should each of these go into some structure? */
     DWORD orig_width, orig_height;
     LONG orig_pitch;