private void shutdownEngine()
{
Trace.WriteLine("Shutting down engine and forcing garbage collection.", "notice");
try{
if (engine != null)
{
engine.Dispose();
engine = null;
}
//If there are any bugs involving destructors or disposing unmanaged objects, hopefully this will trigger them.
GC.Collect();
}
catch (Exception ex)
{
Trace.WriteLine("Engine shutdown failed: " + ex.ToString(), "warning");
}
finally{
engine = null;
}
}
private void switchState(FractalEngineState rs)
{
FractalEngineState cs = this.EngineState; //the current engine state
try{
if (rs == cs)
{
return; //they match, do nothing
}
else if (cs == FractalEngineState.Online)
{
if (rs == FractalEngineState.Suspended) //go from online to suspended
{
engine.Deallocate();
}
else if (rs == FractalEngineState.Offline) //go from online to offline
{
shutdownEngine();
}
}
else if (cs == FractalEngineState.Suspended)
{
if (rs == FractalEngineState.Online) //go from suspended to online
{
allocateEngine();
}
else if (rs == FractalEngineState.Offline) //go from suspended to offline
{
shutdownEngine();
}
}
else if (cs == FractalEngineState.Offline)
{
if (rs == FractalEngineState.Online) //go from offline to online
{
deviceEntry = chooseDevice();
engine = deviceEntry.CreateFractalEngine(mainForm.Renderer.Context);
allocateEngine();
}
else if (rs == FractalEngineState.Suspended) //go from offline to suspended
{
deviceEntry = chooseDevice();
engine = deviceEntry.CreateFractalEngine(mainForm.Renderer.Context);
}
}
else if (cs == FractalEngineState.Error)
{
if (rs == FractalEngineState.Offline) //go from error to offline
{
shutdownEngine();
}
}
}
catch (Exception ex) //if something goes wrong, switch to the error state
{
shutdownEngine();
if (ex is NoDevicesFoundException)
{
currentException = ex;
}
else
{
currentException = new FractalEngineStateException(deviceEntry == null ? EngineType.Auto : deviceEntry.EngineType, cs, rs, ex);
}
}
}
