Question

我正在创建一个多显示器全屏DXGI / D3D应用程序。我正在通过可用的输出和适配器进行枚举，以准备创建交换链。

使用DXGI的IDXGIFactory::CreateSwapChain方法创建交换链时，我需要提供交换链描述，其中包含类型DXGI_MODE_DESC的缓冲区描述，详细说明宽度，高度，刷新率等。我可以找出当前设置的输出（或者如何找出当前输出的显示模式）？当我使用此交换链进入全屏时，我不想更改用户的分辨率或刷新率。

Answer 1

在浏览了一些之后，我偶然发现了EnumDisplaySettings传统的GDI函数，它允许我访问当前的分辨率和刷新率。将其与IDXGIOutput::FindClosestMatchingMode函数相结合，我可以非常接近当前的显示模式：

void getClosestDisplayModeToCurrent(IDXGIOutput* output, DXGI_MODE_DESC* outCurrentDisplayMode)
{
  DXGI_OUTPUT_DESC outputDesc;
  output->GetDesc(&outputDesc);
  HMONITOR hMonitor = outputDesc.Monitor;
  MONITORINFOEX monitorInfo;
  monitorInfo.cbSize = sizeof(MONITORINFOEX);
  GetMonitorInfo(hMonitor, &monitorInfo);
  DEVMODE devMode;
  devMode.dmSize = sizeof(DEVMODE);
  devMode.dmDriverExtra = 0;
  EnumDisplaySettings(monitorInfo.szDevice, ENUM_CURRENT_SETTINGS, &devMode);

  DXGI_MODE_DESC current;
  current.Width = devMode.dmPelsWidth;
  current.Height = devMode.dmPelsHeight;
  bool useDefaultRefreshRate = 1 == devMode.dmDisplayFrequency || 0 == devMode.dmDisplayFrequency;
  current.RefreshRate.Numerator = useDefaultRefreshRate ? 0 : devMode.dmDisplayFrequency;
  current.RefreshRate.Denominator = useDefaultRefreshRate ? 0 : 1;
  current.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
  current.ScanlineOrdering = DXGI_MODE_SCANLINE_ORDER_UNSPECIFIED;
  current.Scaling = DXGI_MODE_SCALING_UNSPECIFIED;

  output->FindClosestMatchingMode(&current, outCurrentDisplayMode, NULL);
}

...但我认为这不是正确答案，因为我需要使用遗留功能。有没有办法用DXGI来获得精确的当前显示模式而不是使用这种方法？

Answer 2

我在这里看到了解决方案： http://www.rastertek.com/dx11tut03.html

在下面的部分：

   // Now go through all the display modes and find the one that matches the screen width and height.
    // When a match is found store the numerator and denominator of the refresh rate for that monitor.
    for(i=0; i<numModes; i++)
    {
        if(displayModeList[i].Width == (unsigned int)screenWidth)
        {
            if(displayModeList[i].Height == (unsigned int)screenHeight)
            {
                numerator = displayModeList[i].RefreshRate.Numerator;
                denominator = displayModeList[i].RefreshRate.Denominator;
            }
        }
    }

我的理解是否正确，可用的分辨率在displayModeList中。

Answer 3

This might be what you are looking for:


            // Get display mode list
            std::vector<DXGI_MODE_DESC*> modeList = GetDisplayModeList(*outputItor);
            for(std::vector<DXGI_MODE_DESC*>::iterator modeItor = modeList.begin(); modeItor != modeList.end(); ++modeItor)
            {
            //  PrintDisplayModeInfo(*modeItor);
            }
        }




std::vector<DXGI_MODE_DESC*> GetDisplayModeList(IDXGIOutput* output)
{
    UINT num = 0;
    DXGI_FORMAT format = DXGI_FORMAT_R32G32B32A32_TYPELESS;
    UINT flags = DXGI_ENUM_MODES_INTERLACED | DXGI_ENUM_MODES_SCALING;

    // Get number of display modes
    output->GetDisplayModeList(format, flags, &num, 0);

    // Get display mode list
    DXGI_MODE_DESC * pDescs = new DXGI_MODE_DESC[num];
    output->GetDisplayModeList(format, flags, &num, pDescs);

    std::vector<DXGI_MODE_DESC*> displayList;
    for(int i = 0; i < num; ++i)
    {
        displayList.push_back(&pDescs[i]);
    }

    return displayList;
}

如何获得DXGI中监视器/输出的当前显示模式（分辨率，刷新率）？

3 个答案: