//chooses an appropriate state for the rendering engine
private void chooseDesiredEngineState()
{
FractalEngineState state = FractalEngineState.Offline;
if (!this.ReadyToRender || !renderer.HasGraphics)
{
state = FractalEngineState.Offline;
}
else if (
this.ClientSize.IsEmpty || this.RendererSize.IsEmpty ||
this.Resizing || this.DlgActive || FractalManager.Fractal == null)
{
state = FractalEngineState.Suspended;
}
else
{
state = FractalEngineState.Online;
}
engineMgr.DesiredEngineState = state;
if (config.AutoSizeRenderer)
{
engineMgr.DesiredOutputSize = renderer.ClientSize;
}
else
{
engineMgr.DesiredOutputSize = config.CustomRes;
}
updateEngineStatusPanel();
//if an engine error hasn't been shown before, do the engine error dialog.
if (engineMgr.EngineState == FractalEngineState.Error && !engineErrorShown)
{
engineErrorShown = true;
ErrorForm.Show(engineMgr.CurrentException);
}
}
private void updateEngineStatusPanel()
{
if (engineMgr == null)
{
return;
}
FractalEngineState cs = engineMgr.EngineState;
FractalEngineState ds = engineMgr.DesiredEngineState;
string str = "";
switch (cs)
{
case FractalEngineState.Online:
switch (ds)
{
case FractalEngineState.Online: str = "is online."; break;
case FractalEngineState.Suspended: str = "is suspending..."; break;
case FractalEngineState.Offline: str = "is shutting Down..."; break;
}
engineStatusPanel.Visible = false;
renderer.Visible = true;
break;
case FractalEngineState.Suspended:
switch (ds)
{
case FractalEngineState.Online: str = "is resuming..."; break;
case FractalEngineState.Suspended: str = "is suspended."; break;
case FractalEngineState.Offline: str = "is shutting Down..."; break;
}
renderer.Visible = false;
viewEngineErrorButton.Visible = false;
restartEngineButton.Visible = false;
engineStatusPanel.Visible = true;
break;
case FractalEngineState.Offline:
switch (ds)
{
case FractalEngineState.Online: str = "is starting..."; break;
case FractalEngineState.Suspended: str = "is starting..."; break;
case FractalEngineState.Offline: str = "is offline."; break;
}
renderer.Visible = false;
viewEngineErrorButton.Visible = false;
restartEngineButton.Visible = false;
engineStatusPanel.Visible = true;
break;
case FractalEngineState.Error:
default:
str = "has crashed.";
renderer.Visible = false;
viewEngineErrorButton.Visible = true;
restartEngineButton.Visible = true;
engineStatusPanel.Visible = true;
break;
}
engineStatusLabel.Text = string.Format("Fractal engine {0}", str);
}
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);
}
}
}
public FractalEngineStateException(EngineType engineType, FractalEngineState fromState, FractalEngineState toState, Exception innerException)
: base(engineType, "An error has occured in the fractal engine.", innerException)
{
this.Data["fromState"] = (object)fromState;
this.Data["toState"] = (object)toState;
}
public void UpdateEngineState()
{
FractalEngineState rs = this.DesiredEngineState; //the desired engine state
switchState(rs);
}
