如何在DXGI中获取监视器/输出的当前显示模式(分辨率，刷新率)? [英] How to get current display mode (resolution, refresh rate) of a monitor/output in DXGI?

问题描述

我正在创建一个多监视器全屏DXGI/D3D应用程序.我在准备创建交换链的过程中将列举所有可用的输出和适配器.

I am creating a multi-monitor full screen DXGI/D3D application. I am enumerating through the available outputs and adapters in preparation of creating their swap chains.

使用DXGI的 IDXGIFactory创建我的交换链时: :CreateSwapChain 方法，我需要提供一个交换链描述，其中包括类型为

When creating my swap chain using DXGI's IDXGIFactory::CreateSwapChain method, I need to provide a swap chain description which includes a buffer description of type DXGI_MODE_DESC that details the width, height, refresh rate, etc. How can I find out what the output is currently set to (or how can I find out what the display mode of the output currently is)? I don't want to change the user's resolution or refresh rate when I go to full screen with this swap chain.

推荐答案

环顾四周后，我偶然发现了EnumDisplaySettings旧版GDI函数，该函数使我可以访问当前的分辨率和刷新率.将此与IDXGIOutput::FindClosestMatchingMode函数结合使用，我可以非常接近当前的显示模式:

After looking around some more I stumbled upon the EnumDisplaySettings legacy GDI function, which allows me to access the current resolution and refresh rate. Combining this with the IDXGIOutput::FindClosestMatchingMode function I can get pretty close to the current display mode:

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);
}

...但是我不认为这确实是正确的答案，因为我需要使用遗留函数.有什么方法可以使用DXGI来获得确切的当前显示模式，而不是使用此方法?

...But I don't think that this is really the correct answer because I'm needing to use legacy functions. Is there any way to do this with DXGI to get the exact current display mode rather than using this method?

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