Method MessageLoop

samples/SampleBase/core/DeviceManager.cpp:341–401

}

void
DeviceManager::MessageLoop() 
{
    MSG msg = {0};

    LARGE_INTEGER perfFreq, previousTime;
    QueryPerformanceFrequency(&perfFreq);
    QueryPerformanceCounter(&previousTime);
    
    while (WM_QUIT != msg.message)
    {
        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
        else
        {
			PROFILER_BEGIN("Main Loop");

            LARGE_INTEGER newTime;
            QueryPerformanceCounter(&newTime);
            
            double elapsedSeconds = (m_FixedFrameInterval >= 0) 
                ? m_FixedFrameInterval  
                : (double)(newTime.QuadPart - previousTime.QuadPart) / (double)perfFreq.QuadPart;

            if(m_SwapChain && GetWindowState() != kWindowMinimized)
            {
                Animate(elapsedSeconds);
                Render(); 
                m_SwapChain->Present(m_SyncInterval, 0);
                Sleep(0);
            }
            else
            {
                // Release CPU resources when idle
                Sleep(1);
            }

            {
                m_vFrameTimes.push_back(elapsedSeconds);
                double timeSum = 0;
                for(auto it = m_vFrameTimes.begin(); it != m_vFrameTimes.end(); it++)
                    timeSum += *it;

                if(timeSum > m_AverageTimeUpdateInterval)
                {
                    m_AverageFrameTime = timeSum / (double)m_vFrameTimes.size();
                    m_vFrameTimes.clear();
                }
            }

            previousTime = newTime;

			PROFILER_END();
			PROFILER_RESET();
        }