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How do you query the amount of VRAM available when using DirectX?

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2 Answers 2

up vote 7 down vote accepted

According to Game Coding Complete 3, there are a few ways:

  • DX7's GetAvailableVidMem() - usually pretty good. Doesn't work too well on cards with shared memory.
  • WMI (Windows Management Interface) has a similar result to the above.
  • DxDiag uses both to give a better result.
  • D3D9 has a GetAvailableTextureMemory() function, but can only be used on Windows Vista/7.

Look for a DX sample in March 08 or later SDK called 'VideoMemory'.

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DX Sample for Video Memory is great -- should have found that before asking ;) –  Vincent Scheib Oct 8 '10 at 17:38
1  
Considering how many computers will use shared memory, I would not recommend DX7's version. And how can the D3D9 version of this be only available on Vista+ ? D3D9 was there in XP... –  Bahbar Oct 12 '10 at 20:57

For DX9EX on Vista and later:

IDXGIDevice * pDXGIDevice;
hr = g_pd3dDevice->QueryInterface(__uuidof(IDXGIDevice), (void **)&pDXGIDevice);
IDXGIAdapter * pDXGIAdapter;
pDXGIDevice->GetAdapter(&pDXGIAdapter);
DXGI_ADAPTER_DESC adapterDesc;
pDXGIAdapter->GetDesc(&adapterDesc);
return adapterDesc.DedicatedVideoMemory;

(from http://msdn.microsoft.com/en-us/library/bb174526(v=VS.85).aspx )

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