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Editorial Team
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Asked: 2026-05-22T11:39:22+00:00

I know how to open a window with openGL (using Win32 or other toolkits).

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I know how to open a window with openGL (using Win32 or other toolkits). But when the system have 2 graphics cards. How do I select a graphic device to render? My programming language is C++ and I’m focusing on windows but any sample will be welcome.

Edit: Maybe Its a good idea to explain my problem better, in order to add some perspective: My new laptop have two graphic cards. An integrated Intel HD and a GeForce GT 540M. The intel card works most of the time to render SO, because it save battery. When a game is started, then the GeForce is started automatically. This system is called “optimus” by nvidia ( http://www.nvidia.com/object/optimus_technology.html ). The problem is that when I start my application, de opengl driver detected is 2.1 and the vendor is Intel, and I don’t know how to switch to the other device.

Finally I found this information. It isn’t too useful if you are not using nvidia but I let it to any who could read http://developer.download.nvidia.com/compute/cuda/3_2/toolkit/docs/CUDA_Developer_Guide_for_Optimus_Platforms.pdf

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1 Answer

  1. Editorial Team

    I am not 100% sure, but I seem to remember that under Windows this is not possible, other than to create a window on a specific screen.

    NVidia provided an extension called WGL_NV_gpu_affinity. I’m not sure if this is still available and whether it works as you would like.

    Edit:

    I see that similar information is already provided in another thread, with an additonal link to this PDF. Not a satisfying answer perhaps, but at least some info.

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