Selecting the actual GPU

Paul Kruitz · 2016-05-31T20:28:01

So ever since I switched my project to VS2015 and windows 10 it wont actually select the NV gpu as the gpu to render with. I have code in the project like this which should select the adapter that is not the intel adapter. IDXGIAdapter* adapter = nullptr; IDXGIFactory * pFactory; HRESULT hr = CreateDXGIFactory(__uuidof(IDXGIFactory), (void**)(&pFactory)); if (hr == S_OK) { for (size_t counter = 0; hr == S_OK; ++counter) { adapter = nullptr; hr = pFactory->EnumAdapters((UINT)counter, &adapter); MSG_TRACE_CHANNEL("RENDER SYSTEM ADAPTER INFO:", "%d", counter); if (adapter != nullptr) { DXGI_ADAPTER_DESC adapterDesc; adapter->GetDesc(&adapterDesc); MSG_TRACE_CHANNEL("RENDER SYSTEM ADAPTER INFO:", "vendor id: %x", adapterDesc.VendorId); MSG_TRACE_CHANNEL("RENDER SYSTEM ADAPTER INFO:", "device id: %x", adapterDesc.DeviceId); MSG_TRACE_CHANNEL("RENDER SYSTEM ADAPTER INFO:", "subsytem id: %x", adapterDesc.SubSysId); MSG_TRACE_CHANNEL("RENDER SYSTEM ADAPTER INFO:", "revision: %d", adapterDesc.Revision); MSG_TRACE_CHANNEL("RENDER SYSTEM ADAPTER INFO:", "Dedicated VRAM: %llu MiB", adapterDesc.DedicatedVideoMemory / (1024 * 1024)); MSG_TRACE_CHANNEL("RENDER SYSTEM ADAPTER INFO:", "Dedicated RAM: %llu MiB", adapterDesc.DedicatedSystemMemory / (1024 * 1024)); MSG_TRACE_CHANNEL("RENDER SYSTEM ADAPTER INFO:", "Shared RAM: %llu MiB", adapterDesc.SharedSystemMemory / (1024 * 1024)); std::string str; convertToCString(adapterDesc.Description, str); MSG_TRACE_CHANNEL("RENDER SYSTEM ADAPTER INFO:", "description: %s", str.c_str()); if (adapterDesc.VendorId != 0x8086) //This is intels vendor ID, I run this on NV and AMD/ATi chips { break; } } } pFactory->Release(); } if (!m_deviceManager.createDevice(adapter)) { ExitProcess(1); //Fix this exit cleanly } However when running this on a 970M GTX, even with the GPU preffered set to NV in the NV control panel, the game just wont render anything to the hwnd. I have done render doc traces that show me that the D3D runtime is actually drawing stuff. I have traced all the windows and D3D calls and none of these are failing, they all return S_OK, which means everything should work. Any idea how I can actually pick the NV Gpu to run the application on because the debug build on the iGPU bearly reaches 60fps and the game is not drawing all that much to begin with. So going forward keeping it on the iGPU is not going to be fast enough for me, debugging a slide show is a pain in the ass (I was CPU bound and because of that had 3fps I fixed those things).

Graphics and GPU Programming Programming

Started by NightCreature83 May 30, 2016 09:47 PM

10 comments, last by NightCreature83 7 years, 10 months ago

MattSutherlin

1,210

May 31, 2016 08:25 PM

As of Windows 8.1, hybrid GPU configurations are officially supported by the OS, so this whitepaper is somewhat out-of-date. For D3D9, you are correct that your only choice is one or the other, and that the decision is made outside of the control of your application, but for DXGI (i.e. D3D11 or D3D12) there is no adapter hiding. The only thing that those exports will do is change the default enumeration order of the GPUs. Which, if you're enumerating explicitly, doesn't matter too much.

I'm going to take this to mean that DXGI does the right thing in various hybrid GPU configurations, as long as you are running Win 8.1 or beyond. If someone has up to date info and I'm wrong, please correct me, but the last time I dealt with this DXGI does not do the right thing in D3D11 under Win 7. In an Optimus setup, it would report the Intel adapter with displays correctly, and then report a second adapter with zero displays and nearly no adapter information. Unless I did extern the variable as outlined in the whitepaper, and then I got the enumerations I expected. Has that behavior changed?

I guess my point is, unless someone has more current info that my experience is no longer what happens, you might want to still handle the case for D3D11 users not running Win8.1+?

NightCreature83

5,061

Author

May 31, 2016 08:28 PM

This is the info I get from DXGI on Windows 10


[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(105) : 0
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(110) : vendor id: 8086
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(111) : device id: 416
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(112) : subsytem id: 11021462
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(113) : revision: 6
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(114) : Dedicated VRAM: 112 MiB
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(115) : Dedicated RAM: 0 MiB
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(116) : Shared RAM: 8150 MiB
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(119) : description: Intel(R) HD Graphics 4600
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(105) : 1
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(110) : vendor id: 10de
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(111) : device id: 13d8
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(112) : subsytem id: 11021462
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(113) : revision: 161
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(114) : Dedicated VRAM: 2991 MiB
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(115) : Dedicated RAM: 0 MiB
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(116) : Shared RAM: 8150 MiB
[RENDER SYSTEM ADAPTER INFO:] : ..\..\Graphics\RenderSystem.cpp(119) : description: NVIDIA GeForce GTX 970M

If you set the preffered adapter to be NVidia in the control panel of the driver than DXGI will report that adapter first.

Worked on titles: CMR:DiRT2, DiRT 3, DiRT: Showdown, GRID 2, theHunter, theHunter: Primal, Mad Max, Watch Dogs: Legion

Selecting the actual GPU

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