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copenglmulti-gpu

Programmatic SLI and CrossFireX Detection

Using C how can I detect the currently installed discrete GPUs and if they are currently in CrossFireX or SLI. I am using windows 7 and openGL. I would like to discover this information so that in my game I can support Alternate Frame Rendering more efficiently.

Solution

  • You need to use specific extensions, for each vendor. For CrossFire, you would use WGL_AMD_gpu_association, and specifically wglGetGPUIDsAMD and wglGetGPUInfoAMD to get information about the different GPUs. For Nvidia SLI, you would use WGL_NV_gpu_affinity, and specifically wglEnumGpusNV and wglEnumGpuDevicesNV to get information about the different GPUs.

    To actually utilize multi-gpu, you will also need to create your contexts with the functions within those two extensions as well.