/*!
* Events are moved from the Vixen SharedWorld to the C#
* application through a shared event queue. Events
* observed and handled by the Vixen SharedWorld object
* are put into a queue. The Canvas3D class maintains a separate
* thread which waits on this queue and converts any Vixen Events
* it finds into C# Vixen.EventArgs and raises a .NET event
* which can be handled in the C# application.
*/
protected void EventLoop()
{
_stopevents = false;
if ((_world == null) || (_scene == null))
{
return;
}
if ((_world.FileName != null) && SharedWorld.DoAsyncLoad)
{
_world.LoadAsync(_world.FileName, _scene);
}
while (!_stopevents)
{
try
{
Event ev = _world.NextEvent();
if (ev == null)
{
break;
}
string name = ev.GetName();
EventArgs args = new VixenEventArgs(ev, RoutedVixenEvent);
object[] list = { this, args };
VixenEventHandler handler = new VixenEventHandler(PostVixenEvent);
//SharedWorld.Trace("Canvas3D:Event " + name + "\n");
Dispatcher.BeginInvoke(handler, list);
}
catch (Exception ex)
{
SharedWorld.LogError("exception in event loop " + ex.Message);
}
}
_world.Stop();
}
/*!
* @param world Vixen 3D world
* Initializes the Vixen 3D environment for the given world.
* If you do not provide an initial world, one is created for you.
* This function does not start 3D display - RunVixen does that.
* The world can only be initialized once - subsequent calls do nothing.
*
* @return -> Vixen SharedWorld or null if initialization failed
*/
static public SharedWorld StartVixen(SharedWorld world)
{
_world = world;
if (_world == null)
{
_world = new Viewer3D();
}
else if (_world.FileName != null)
{
string dir = Path.GetDirectoryName(_world.FileName);
if ((dir != null) && (dir.Length > 0))
{
Directory.SetCurrentDirectory(dir);
_world.SetMediaDir(dir);
}
}
if ((_world == null) || !_world.OnInit())
{
SharedWorld.LogError("cannot initialize Vixen");
return(null);
}
GC.KeepAlive(_world);
_world.MakeLock();
if (UsePhysics)
{
Physics.Startup();
}
return(_world);
}
/*!
* Start up Vixen 3D display and event processing.
* This function should not be called until the
* underlying Window has been created and the
* OS window handle is available. Vixen will display
* the 3D content in this window.
*/
public virtual bool RunVixen()
{
bool loadasync = World.DoAsyncLoad;
if (_world == null)
{
SharedWorld.LogError("Vixen did not start");
return(false);
}
if (_window == null)
{
SharedWorld.LogError("Cannot get window handle for parent window");
return(false);
}
if (_world.IsRunning())
{
return(false);
}
//world.SetDebugLevel(1);
if (MediaDir != null)
{
_world.SetMediaDir(MediaDir);
}
if (ContentFile == null)
{
loadasync = false;
}
else if (loadasync)
{
_world.FileName = GetMediaPath(ContentFile);
}
_world.Run((long)_window);
if (_world.IsRunning())
{
ThreadStart eventloop = new ThreadStart(EventLoop);
Thread thread = new Thread(eventloop);
_scene = SharedWorld.MainScene;
thread.Start();
if (!loadasync)
{
try
{
Scene scene = MakeScene();
if (scene != null)
{
GC.KeepAlive(scene);
_world.SetScene(scene);
}
}
catch (Exception ex)
{
SharedWorld.LogError("exception making initial scene " + ex.Message);
}
}
return(true);
}
return(false);
}
/*!
* Start up Vixen 3D display and event processing.
* This function should not be called until the
* underlying Window has been created and the
* OS window handle is available. Vixen will display
* the 3D content in this window.
*/
public virtual bool RunVixen()
{
SharedWorld world = SharedWorld.Get();
IntPtr windowHandle = Handle;
Scene scene = null;
try
{
if (windowHandle == null)
{
LogError("Cannot get window handle for parent window");
return(false);
}
if ((world != null) && world.IsRunning())
{
return(false);
}
//world.SetDebugLevel(1);
world.Run((uint)windowHandle);
}
catch (Exception ex)
{
LogError("exception starting 3D " + ex.Message);
}
if (world.IsRunning())
{
ThreadStart eventloop = new ThreadStart(EventLoop);
Thread thread = new Thread(eventloop);
bool loadasync = World.DoAsyncLoad;
if (MediaDir != null)
{
world.SetMediaDir(MediaDir);
}
if (ContentFile != null)
{
world.FileName = GetMediaPath(ContentFile);
}
else
{
loadasync = false;
}
thread.Start();
if (!loadasync)
{
try
{
scene = MakeScene();
if (scene != null)
{
world.SetScene(scene);
}
}
catch (Exception ex)
{
SharedWorld.LogError("exception making initial scene " + ex.Message);
}
}
scene = world.GetScene();
if (scene != null)
{
scene.OnResize();
}
return(true);
}
return(false);
}