static void* RunEngine(void* data)
{
debug_SetThreadName("engine_thread");
// Set new main thread so that all the thread-safety checks pass
ThreadUtil::SetMainThread();
g_Profiler2.RegisterCurrentThread("atlasmain");
const CmdLineArgs args = *reinterpret_cast<const CmdLineArgs*>(data);
MessagePasserImpl* msgPasser = (MessagePasserImpl*)AtlasMessage::g_MessagePasser;
// Register all the handlers for message which might be passed back
RegisterHandlers();
// Override ah_display_error to pass all errors to the Atlas UI
// TODO: this doesn't work well because it doesn't pause the game thread
// and the error box is ugly, so only use it if we fix those issues
// (use INIT_HAVE_DISPLAY_ERROR init flag to test this)
AppHooks hooks = {0};
hooks.display_error = AtlasDisplayError;
app_hooks_update(&hooks);
// Disable the game's cursor rendering
extern CStrW g_CursorName;
g_CursorName = L"";
state.args = args;
state.running = true;
state.view = AtlasView::GetView_None();
state.glCanvas = NULL;
double last_activity = timer_Time();
while (state.running)
{
bool recent_activity = false;
//////////////////////////////////////////////////////////////////////////
// (TODO: Work out why these things have to be in this order (to avoid
// jumps when starting to move, etc))
// Calculate frame length
{
const double time = timer_Time();
static double last_time = time;
const double realFrameLength = time-last_time;
last_time = time;
ENSURE(realFrameLength >= 0.0);
// TODO: filter out big jumps, e.g. when having done a lot of slow
// processing in the last frame
state.realFrameLength = realFrameLength;
}
// Process the input that was received in the past
if (g_Input.ProcessInput(&state))
recent_activity = true;
//////////////////////////////////////////////////////////////////////////
{
IMessage* msg;
while ((msg = msgPasser->Retrieve()) != NULL)
{
recent_activity = true;
std::string name (msg->GetName());
msgHandlers::const_iterator it = GetMsgHandlers().find(name);
if (it != GetMsgHandlers().end())
{
it->second(msg);
}
else
{
debug_warn(L"Unrecognised message");
// CLogger might not be initialised, but this error will be sent
// to the debug output window anyway so people can still see it
LOGERROR("Unrecognised message (%s)", name.c_str());
}
if (msg->GetType() == IMessage::Query)
{
// For queries, we need to notify MessagePasserImpl::Query
// that the query has now been processed.
sem_post((sem_t*) static_cast<QueryMessage*>(msg)->m_Semaphore);
// (msg may have been destructed at this point, so don't use it again)
// It's quite possible that the querier is going to do a tiny
// bit of processing on the query results and then issue another
// query, and repeat lots of times in a loop. To avoid slowing
// that down by rendering between every query, make this
// thread yield now.
SDL_Delay(0);
}
else
{
// For non-queries, we need to delete the object, since we
// took ownership of it.
AtlasMessage::ShareableDelete(msg);
}
}
}
// Exit, if desired
if (! state.running)
break;
//////////////////////////////////////////////////////////////////////////
// Do per-frame processing:
ReloadChangedFiles();
RendererIncrementalLoad();
// Pump SDL events (e.g. hotkeys)
SDL_Event_ ev;
while (in_poll_event(&ev))
in_dispatch_event(&ev);
if (g_GUI)
g_GUI->TickObjects();
state.view->Update(state.realFrameLength);
state.view->Render();
if (CProfileManager::IsInitialised())
g_Profiler.Frame();
double time = timer_Time();
if (recent_activity)
last_activity = time;
// Be nice to the processor (by sleeping lots) if we're not doing anything
// useful, and nice to the user (by just yielding to other threads) if we are
bool yield = (time - last_activity > 0.5);
// But make sure we aren't doing anything interesting right now, where
// the user wants to see the screen updating even though they're not
// interacting with it
if (state.view->WantsHighFramerate())
yield = false;
if (yield) // if there was no recent activity...
{
double sleepUntil = time + 0.5; // only redraw at 2fps
while (time < sleepUntil)
{
// To minimise latency when the user starts doing stuff, only
// sleep for a short while, then check if anything's happened,
// then go back to sleep
// (TODO: This should probably be done with something like semaphores)
Atlas_NotifyEndOfFrame(); // (TODO: rename to NotifyEndOfQuiteShortProcessingPeriodSoPleaseSendMeNewMessages or something)
SDL_Delay(50);
if (!msgPasser->IsEmpty())
break;
time = timer_Time();
}
}
else
{
Atlas_NotifyEndOfFrame();
SDL_Delay(0);
}
}
return NULL;
}
