[vlc] Trying to use AssignNVidiaAffinity to assign OpenGL a specific graphics card

[David R Robison]

We have an application that uses two nvidia cards and four monitors. We 
are attempting to display 48 videos. However, when using vout=opengl it 
appears that all the OpenGL acceleration is being preformed by only one 
of the graphics adapters. I have been playing with the 
AssignNVidiaAffinity function to try and assign the OpenGL to one of the 
two graphics adapters. I have the following function that creates the 
affinity mask:

static void AssignNVidiaAffinity(vout_display_t *vd, UINT 
nVidiaAffinity, HGPUNV *GpuMask) {
     UINT GPUIdx = 0;
     HGPUNV hGPU;
     while(wglEnumGpusNV(GPUIdx, &hGPU)) {
         if (GPUIdx == nVidiaAffinity) GpuMask[0] = hGPU;
         GPUIdx++;
     }
}

To get it to link I have to define

#define GLEW_STATIC

Everything compiles, but when I try to run the program it crashes when 
executing the wglEnumGpusNV call.

Has anyone attempted this before? Any thoughts on what I may be doing 
wrong? We are running under Windows 7.
Thanks, David

-- 

David R Robison
Open Roads Consulting, Inc.
103 Watson Road, Chesapeake, VA 23320
phone: (757) 546-3401
e-mail: drrobison at openroadsconsulting.com
web: http://openroadsconsulting.com
blog: http://therobe.blogspot.com
book: http://www.xulonpress.com/bookstore/bookdetail.php?PB_ISBN=9781597816526



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