Method OnLoop

Source/Engine/Engine/Engine.cpp:167–237

}

void Engine::OnLoop()
{
    // Reduce CPU usage by introducing idle time if the engine is running very fast and has enough time to spend
    const bool useSleep = !PLATFORM_WEB; // TODO: this should probably be a platform setting
    if ((useSleep && Time::UpdateFPS > ZeroTolerance) || !Platform::GetHasFocus())
    {
        double nextTick = Time::GetNextTick();
        double timeToTick = nextTick - Platform::GetTimeSeconds();

        // Sleep less than needed, some platforms may sleep slightly more than requested
        if (timeToTick > 0.002)
        {
            PROFILE_CPU_NAMED("Idle");
            auto sleepStart = Platform::GetTimeSeconds();
            Platform::Sleep(1);
            auto sleepEnd = Platform::GetTimeSeconds();
            EngineIdleTime += sleepEnd - sleepStart;
        }
    }

    // App paused logic
    if (Platform::GetIsPaused())
    {
        OnPause();
        do
        {
            Platform::Sleep(10);
            Platform::Tick();
        } while (Platform::GetIsPaused() && !ShouldExit());
        if (ShouldExit())
            return;
        OnUnpause();
    }

    // Use the same time for all ticks to improve synchronization
    const double time = Platform::GetTimeSeconds();

    // Update application (will gather data and other platform related events)
    {
        PROFILE_CPU_NAMED("Platform.Tick");
        Platform::Tick();
#if COMPILE_WITH_PROFILER
        extern void TickProfilerMemory();
        TickProfilerMemory();
#endif
    }

    // Update game logic
    if (Time::OnBeginUpdate(time))
    {
        OnUpdate();
        OnLateUpdate();
        Time::OnEndUpdate();
        EngineIdleTime = 0;
    }

    // Start physics simulation
    if (Time::OnBeginPhysics(time))