小编n0l*_*var的帖子

std::chrono::system_clock::time_point m_BeginFrame = std::chrono::system_clock::now();
std::chrono::system_clock::time_point m_EndFrame = std::chrono::system_clock::now();
std::chrono::nanoseconds m_WorkTime = std::chrono::nanoseconds::zero();
std::chrono::nanoseconds m_WaitTime = std::chrono::nanoseconds::zero();
auto invFpsLimit = std::chrono::nanoseconds(1e9 / fpsLimit());

// main loop
while (!glfwWindowShouldClose(m_pScreen->glfwWindow()))
{
    m_WaitTime = m_BeginFrame - m_EndFrame;
    m_EndFrame = std::chrono::system_clock::now();
    m_WorkTime = m_EndFrame - m_BeginFrame;

    // if need sleep
    if (m_WorkTime < invFpsLimit)
    {
        std::this_thread::sleep_until(m_BeginFrame + invFpsLimit);
        m_DeltaTime = invFpsLimit;
    }
    else
    {
       m_DeltaTime = m_WorkTime;
    }

    m_BeginFrame = std::chrono::system_clock::now();

    TRACE("   %f   %u   %u   %u",
            ((float)1e9 / (float)(m_WaitTime.count() + m_WorkTime.count())),
            m_WorkTime.count(),
            m_WaitTime.count(),
            invFpsLimit.count());


    // …