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#include "precomp.hpp"

using namespace cv;
using namespace cv::gpu;


namespace 
{
    template <typename Comparer>
    bool compareToSet(const std::string& set_as_str, int value, Comparer cmp)
    {
        if (set_as_str.find_first_not_of(" ") == string::npos)
            return false;

        std::stringstream stream(set_as_str);
        int cur_value;

        while (!stream.eof())
        {
            stream >> cur_value;
            if (cmp(cur_value, value))
                return true;
        }

        return false;
    }
}


CV_EXPORTS bool cv::gpu::TargetArchs::builtWith(cv::gpu::GpuFeature feature)
{
    if (feature == NATIVE_DOUBLE)
        return hasEqualOrGreater(1, 3);
    if (feature == ATOMICS)
        return hasEqualOrGreater(1, 1);
    return true;
}


CV_EXPORTS bool cv::gpu::TargetArchs::has(int major, int minor)
{
    return hasPtx(major, minor) || hasBin(major, minor);
}


CV_EXPORTS bool cv::gpu::TargetArchs::hasPtx(int major, int minor)
{
    return ::compareToSet(CUDA_ARCH_PTX, major * 10 + minor, std::equal_to<int>());
}


CV_EXPORTS bool cv::gpu::TargetArchs::hasBin(int major, int minor)
{
    return ::compareToSet(CUDA_ARCH_BIN, major * 10 + minor, std::equal_to<int>());
}


CV_EXPORTS bool cv::gpu::TargetArchs::hasEqualOrLessPtx(int major, int minor)
{
    return ::compareToSet(CUDA_ARCH_PTX, major * 10 + minor, 
                     std::less_equal<int>());
}


CV_EXPORTS bool cv::gpu::TargetArchs::hasEqualOrGreater(int major, int minor)
{
    return hasEqualOrGreaterPtx(major, minor) ||
           hasEqualOrGreaterBin(major, minor);
}


CV_EXPORTS bool cv::gpu::TargetArchs::hasEqualOrGreaterPtx(int major, int minor)
{
    return ::compareToSet(CUDA_ARCH_PTX, major * 10 + minor, 
                     std::greater_equal<int>());
}


CV_EXPORTS bool cv::gpu::TargetArchs::hasEqualOrGreaterBin(int major, int minor)
{
    return ::compareToSet(CUDA_ARCH_BIN, major * 10 + minor, 
                     std::greater_equal<int>());
}


#if !defined (HAVE_CUDA)

CV_EXPORTS int cv::gpu::getCudaEnabledDeviceCount() { return 0; }
CV_EXPORTS void cv::gpu::setDevice(int) { throw_nogpu(); } 
CV_EXPORTS int cv::gpu::getDevice() { throw_nogpu(); return 0; } 
cv::gpu::DeviceInfo::DeviceInfo() { throw_nogpu(); }
cv::gpu::DeviceInfo::DeviceInfo(int) { throw_nogpu(); }
string cv::gpu::DeviceInfo::name() const { throw_nogpu(); return ""; }
int cv::gpu::DeviceInfo::major() const { throw_nogpu(); return 0; }
int cv::gpu::DeviceInfo::minor() const { throw_nogpu(); return 0; }
int cv::gpu::DeviceInfo::multiProcessorCount() const { throw_nogpu(); return 0; }
size_t cv::gpu::DeviceInfo::freeMemory() const { throw_nogpu(); return 0; }
size_t cv::gpu::DeviceInfo::totalMemory() const { throw_nogpu(); return 0; }
bool cv::gpu::DeviceInfo::has(cv::gpu::GpuFeature) const { throw_nogpu(); return false; }
bool cv::gpu::DeviceInfo::isCompatible() const { throw_nogpu(); return false; }
void cv::gpu::DeviceInfo::query() const { throw_nogpu(); }
void cv::gpu::DeviceInfo::queryMemory(size_t, size_t) const { throw_nogpu(); }

#else /* !defined (HAVE_CUDA) */

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


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


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


size_t cv::gpu::DeviceInfo::freeMemory() const
{
    size_t free_memory, total_memory;
    queryMemory(free_memory, total_memory);
    return free_memory;
}


size_t cv::gpu::DeviceInfo::totalMemory() const
{
    size_t free_memory, total_memory;
    queryMemory(free_memory, total_memory);
    return total_memory;
}


bool cv::gpu::DeviceInfo::has(cv::gpu::GpuFeature feature) const
{
    if (feature == NATIVE_DOUBLE)
        return major() > 1 || (major() == 1 && minor() >= 3);
    if (feature == ATOMICS)
        return major() > 1 || (major() == 1 && minor() >= 1);
    return false;
}


bool cv::gpu::DeviceInfo::isCompatible() const
{
    // Check PTX compatibility
    if (TargetArchs::hasEqualOrLessPtx(major(), minor()))
        return true;

    // Check BIN compatibility
    for (int i = minor(); i >= 0; --i)
        if (TargetArchs::hasBin(major(), i))
            return true;

    return false;
}


void cv::gpu::DeviceInfo::query()
{
    cudaDeviceProp prop;
    cudaSafeCall(cudaGetDeviceProperties(&prop, device_id_));
    name_ = prop.name;
    multi_processor_count_ = prop.multiProcessorCount;
    major_ = prop.major;
    minor_ = prop.minor;
}


void cv::gpu::DeviceInfo::queryMemory(size_t& free_memory, size_t& total_memory) const
{
    int prev_device_id = getDevice();
    if (prev_device_id != device_id_)
        setDevice(device_id_);

    cudaSafeCall(cudaMemGetInfo(&free_memory, &total_memory));

    if (prev_device_id != device_id_)
        setDevice(prev_device_id);
}

#endif