opencv/modules/gpu/src/initialization.cpp

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#include "precomp.hpp"

using namespace cv;
using namespace cv::gpu;


#if !defined (HAVE_CUDA)

CV_EXPORTS int cv::gpu::getCudaEnabledDeviceCount() { return 0; }
CV_EXPORTS string cv::gpu::getDeviceName(int /*device*/)  { throw_nogpu(); return 0; } 
CV_EXPORTS void cv::gpu::setDevice(int /*device*/) { throw_nogpu(); } 
CV_EXPORTS int cv::gpu::getDevice() { throw_nogpu(); return 0; } 
CV_EXPORTS void cv::gpu::getComputeCapability(int /*device*/, int& /*major*/, int& /*minor*/) { throw_nogpu(); } 
CV_EXPORTS int cv::gpu::getNumberOfSMs(int /*device*/) { throw_nogpu(); return 0; } 
CV_EXPORTS void cv::gpu::getGpuMemInfo(size_t& /*free*/, size_t& /*total*/)  { throw_nogpu(); } 
CV_EXPORTS bool cv::gpu::hasNativeDoubleSupport(int /*device*/) { throw_nogpu(); return false; }
CV_EXPORTS bool cv::gpu::hasAtomicsSupport(int /*device*/) { throw_nogpu(); return false; }


#else /* !defined (HAVE_CUDA) */

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 int cv::gpu::getDevice()
{
    int device;    
    cudaSafeCall( cudaGetDevice( &device ) );
    return 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;
}


CV_EXPORTS void cv::gpu::getGpuMemInfo(size_t& free, size_t& total)
{
    cudaSafeCall( cudaMemGetInfo( &free, &total ) );
}


CV_EXPORTS bool cv::gpu::hasNativeDoubleSupport(int device)
{
    int major, minor;
    getComputeCapability(device, major, minor);
    return major > 1 || (major == 1 && minor >= 3);
}


CV_EXPORTS bool cv::gpu::hasAtomicsSupport(int device) 
{
    int major, minor;
    getComputeCapability(device, major, minor);
    return major > 1 || (major == 1 && minor >= 1);
}


namespace 
{
    struct ComparerEqual 
    {
        bool operator()(int lhs1, int lhs2, int rhs1, int rhs2) const
        {
            return lhs1 == rhs1 && lhs2 == rhs2;
        }
    };


    struct ComparerLessOrEqual
    {
        bool operator()(int lhs1, int lhs2, int rhs1, int rhs2) const
        {
            return lhs1 < rhs1 || (lhs1 == rhs1 && lhs2 <= rhs2);
        }
    };


    struct ComparerGreaterOrEqual
    {
        bool operator()(int lhs1, int lhs2, int rhs1, int rhs2) const
        {
            return lhs1 > rhs1 || (lhs1 == rhs1 && lhs2 >= rhs2);
        }
    };


    template <typename Comparer>
    bool checkPtxVersion(int major, int minor, Comparer cmp) 
    {
#ifdef OPENCV_GPU_CUDA_ARCH_10
        if (cmp(1, 0, major, minor)) return true;
#endif

#ifdef OPENCV_GPU_CUDA_ARCH_11
        if (cmp(1, 1, major, minor)) return true;
#endif

#ifdef OPENCV_GPU_CUDA_ARCH_12
        if (cmp(1, 2, major, minor)) return true;
#endif

#ifdef OPENCV_GPU_CUDA_ARCH_13
        if (cmp(1, 3, major, minor)) return true;
#endif

#ifdef OPENCV_GPU_CUDA_ARCH_20
        if (cmp(2, 0, major, minor)) return true;
#endif

#ifdef OPENCV_GPU_CUDA_ARCH_21
        if (cmp(2, 1, major, minor)) return true;
#endif

        return false;
    }
}


CV_EXPORTS bool cv::gpu::ptxVersionIs(int major, int minor)
{
    return checkPtxVersion(major, minor, ComparerEqual());
}


CV_EXPORTS bool cv::gpu::ptxVersionIsLessOrEqual(int major, int minor)
{
    return checkPtxVersion(major, minor, ComparerLessOrEqual());
}


CV_EXPORTS bool cv::gpu::ptxVersionIsGreaterOrEqual(int major, int minor)
{
    return checkPtxVersion(major, minor, ComparerGreaterOrEqual());
}


CV_EXPORTS bool isCompatibleWith(int device)
{
    // According to the CUDA C Programming Guide Version 3.2: "PTX code 
    // produced for some specific compute capability can always be compiled to
    // binary code of greater or equal compute capability". 

    int major, minor;
    getComputeCapability(device, major, minor);

    return ptxVersionIsLessOrEqual(major, minor);
}

#endif