How to: enumerate adapter (seven)

Disclaimer: This article is a blogger original article, shall not be reproduced without the bloggers allowed. https://blog.csdn.net/xiaoyafang123/article/details/89498662

DirectX 10 and DirectX 11 graphics using the infrastructure available on the (DXGI) enumeration of computer graphics adapter. You usually need to enumerate adapter for the following reasons:

• How many graphics adapter installed on your computer to determine
• Help you choose which adapter to use to create the Direct3D device
• To retrieve an object that can be used to retrieve IDXGIAdapter device functions

Enumeration adapter

1. Creating IDXGIFactory object by calling CreateDXGIFactory function. The following code example demonstrates how to initialize IDXGIFactory object.

   IDXGIFactory * pFactory = NULL;
   
   CreateDXGIFactory(__uuidof(IDXGIFactory) ,(void**)&pFactory)

2. Enumerate each adapter by calling IDXGIFactory :: enumadapter method. Adapter parameter allows you to specify zero-based index number to enumerate the adapter. If the specified index is not available at the adapter, the method returns DXGI_ERROR_NOT_FOUND. The following code example demonstrates how to enumerate the adapter on the computer.

   for (UINT i = 0; 
        pFactory->EnumAdapters(i, &pAdapter) != DXGI_ERROR_NOT_FOUND; 
   	 ++i) 
   { ... }
   

   The following code example demonstrates how to enumerate all the adapters on the computer.

   std::vector <IDXGIAdapter*> EnumerateAdapters(void)
   {
       IDXGIAdapter * pAdapter; 
       std::vector <IDXGIAdapter*> vAdapters; 
       IDXGIFactory* pFactory = NULL; 
       
   
       // Create a DXGIFactory object.
       if(FAILED(CreateDXGIFactory(__uuidof(IDXGIFactory) ,(void**)&pFactory)))
       {
           return vAdapters;
       }
   
   
       for ( UINT i = 0;
             pFactory->EnumAdapters(i, &pAdapter) != DXGI_ERROR_NOT_FOUND;
             ++i )
       {
           vAdapters.push_back(pAdapter); 
       } 
   
   
       if(pFactory)
       {
           pFactory->Release();
       }
   
       return vAdapters;
   
   }