opencv/modules/gpu/src/initialization.cpp

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#include "precomp.hpp"

using namespace cv;
using namespace cv::gpu;

#ifndef HAVE_CUDA

CV_EXPORTS int cv::gpu::getCudaEnabledDeviceCount() { return 0; }
CV_EXPORTS string cv::gpu::getDeviceName(int /*device*/)  { cudaSafeCall(0); return 0; } 
CV_EXPORTS void cv::gpu::setDevice(int /*device*/) { cudaSafeCall(0); } 
CV_EXPORTS void cv::gpu::getComputeCapability(int /*device*/, int* /*major*/, int* /*minor*/) { cudaSafeCall(0); } 
CV_EXPORTS int cv::gpu::getNumberOfSMs(int /*device*/) { cudaSafeCall(0); return 0; } 

#else

CV_EXPORTS int cv::gpu::getCudaEnabledDeviceCount()
{
    int count;
    cudaSafeCall( cudaGetDeviceCount( &count ) );
    return count;
}

CV_EXPORTS string cv::gpu::getDeviceName(int device)
{
    cudaDeviceProp prop;
    cudaSafeCall( cudaGetDeviceProperties( &prop, device) );
    return prop.name;
}

CV_EXPORTS void cv::gpu::setDevice(int device)
{
    cudaSafeCall( cudaSetDevice( device ) );
}

CV_EXPORTS void cv::gpu::getComputeCapability(int device, int* major, int* minor)
{
    cudaDeviceProp prop;    
    cudaSafeCall( cudaGetDeviceProperties( &prop, device) );

    *major = prop.major;
    *minor = prop.minor;
}

CV_EXPORTS int cv::gpu::getNumberOfSMs(int device)
{
    cudaDeviceProp prop;
    cudaSafeCall( cudaGetDeviceProperties( &prop, device ) );
    return prop.multiProcessorCount;
}

#endif