/// <summary>
/// Looks through all available devices and estimates which one will have the best performance
/// </summary>
public DeviceEntry GetBestDevice()
{
DeviceEntry best = null;
float bestRank = 0.0f;
if (FoundDevices != null)
{
foreach (DeviceEntry dev in FoundDevices)
{
if (dev.PerformanceRating > bestRank)
{
bestRank = dev.PerformanceRating;
best = dev;
}
}
}
return(best);
}
/// <summary>
/// Select a device to use based on the current configuration. If no device can be found, this throws NoDevicesFoundException
/// </summary>
private DeviceEntry chooseDevice()
{
if (mainForm.Renderer.Context == null || FoundDevices == null) //if there's no graphics context, bail out
{
return(null);
}
DeviceEntry chosenDev = null;
//first try to find a device with the same type and ID as the one in the config
foreach (DeviceEntry dev in FoundDevices)
{
if (dev.EngineType == mainForm.Config.EngineType && dev.ID == mainForm.Config.DeviceID)
{
chosenDev = dev;
}
}
//if no match was found, just pick the best device
if (chosenDev == null)
{
chosenDev = GetBestDevice();
}
//ok, if still no device is found, then we are in trouble
if (chosenDev == null)
{
Exception cpuEx = null;
try{
CPUDeviceEntry.CheckSupport();
}
catch (Exception ex) {
cpuEx = ex;
}
throw new NoDevicesFoundException("No compatable devices were found.", cpuEx);
}
return(chosenDev);
}
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);
}
}
}