Method Present

Chapter_27/Core/GraphicsCore.cpp:780–828

}

void Graphics::Present(void)
{
    if (g_bEnableHDROutput)
        PreparePresentHDR();
    else
        PreparePresentLDR();

    g_CurrentBuffer = (g_CurrentBuffer + 1) % SWAP_CHAIN_BUFFER_COUNT;

    UINT PresentInterval = s_EnableVSync ? std::min(4, (int)Round(s_FrameTime * 60.0f)) : 0;

    s_SwapChain1->Present(PresentInterval, 0);

    // Test robustness to handle spikes in CPU time
    //if (s_DropRandomFrames)
    //{
    //    if (std::rand() % 25 == 0)
    //        BusyLoopSleep(0.010);
    //}

    int64_t CurrentTick = SystemTime::GetCurrentTick();

    if (s_EnableVSync)
    {
        // With VSync enabled, the time step between frames becomes a multiple of 16.666 ms.  We need
        // to add logic to vary between 1 and 2 (or 3 fields).  This delta time also determines how
        // long the previous frame should be displayed (i.e. the present interval.)
        s_FrameTime = (s_LimitTo30Hz ? 2.0f : 1.0f) / 60.0f;
        if (s_DropRandomFrames)
        {
            if (std::rand() % 50 == 0)
                s_FrameTime += (1.0f / 60.0f);
        }
    }
    else
    {
        // When running free, keep the most recent total frame time as the time step for
        // the next frame simulation.  This is not super-accurate, but assuming a frame
        // time varies smoothly, it should be close enough.
        s_FrameTime = (float)SystemTime::TimeBetweenTicks(s_FrameStartTick, CurrentTick);
    }

    s_FrameStartTick = CurrentTick;

    ++s_FrameIndex;
    TemporalEffects::Update((uint32_t)s_FrameIndex);

    SetNativeResolution();
}

uint64_t Graphics::GetFrameCount(void)
{