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#include "precomp.hpp"

using namespace cv;
using namespace cv::gpu;
using namespace std;

#if !defined (HAVE_CUDA)

cv::gpu::SURF_GPU::SURF_GPU() { throw_nogpu(); }
cv::gpu::SURF_GPU::SURF_GPU(double, int, int, bool, float, bool) { throw_nogpu(); }
int cv::gpu::SURF_GPU::descriptorSize() const { throw_nogpu(); return 0;}
void cv::gpu::SURF_GPU::uploadKeypoints(const vector<KeyPoint>&, GpuMat&) { throw_nogpu(); }
void cv::gpu::SURF_GPU::downloadKeypoints(const GpuMat&, vector<KeyPoint>&) { throw_nogpu(); }
void cv::gpu::SURF_GPU::downloadDescriptors(const GpuMat&, vector<float>&) { throw_nogpu(); }
void cv::gpu::SURF_GPU::operator()(const GpuMat&, const GpuMat&, GpuMat&) { throw_nogpu(); }
void cv::gpu::SURF_GPU::operator()(const GpuMat&, const GpuMat&, GpuMat&, GpuMat&, bool) { throw_nogpu(); }
void cv::gpu::SURF_GPU::operator()(const GpuMat&, const GpuMat&, vector<KeyPoint>&) { throw_nogpu(); }
void cv::gpu::SURF_GPU::operator()(const GpuMat&, const GpuMat&, vector<KeyPoint>&, GpuMat&, bool) { throw_nogpu(); }
void cv::gpu::SURF_GPU::operator()(const GpuMat&, const GpuMat&, vector<KeyPoint>&, vector<float>&, bool) { throw_nogpu(); }
void cv::gpu::SURF_GPU::releaseMemory() { throw_nogpu(); }

#else /* !defined (HAVE_CUDA) */

namespace cv { namespace gpu { namespace surf
{
    void icvCalcLayerDetAndTrace_gpu(const PtrStepf& det, const PtrStepf& trace, int img_rows, int img_cols, int octave, int nOctaveLayers);

    void icvFindMaximaInLayer_gpu(const PtrStepf& det, const PtrStepf& trace, int4* maxPosBuffer, unsigned int* maxCounter,
        int img_rows, int img_cols, int octave, bool use_mask, int nLayers);

    void icvInterpolateKeypoint_gpu(const PtrStepf& det, const int4* maxPosBuffer, unsigned int maxCounter, 
        float* featureX, float* featureY, int* featureLaplacian, float* featureSize, float* featureHessian, 
        unsigned int* featureCounter);

    void icvCalcOrientation_gpu(const float* featureX, const float* featureY, const float* featureSize, float* featureDir, int nFeatures);

    void compute_descriptors_gpu(const DevMem2Df& descriptors, 
        const float* featureX, const float* featureY, const float* featureSize, const float* featureDir, int nFeatures);
}}}

using namespace cv::gpu::surf;

namespace
{
    class SURF_GPU_Invoker : private CvSURFParams
    {
    public:
        SURF_GPU_Invoker(SURF_GPU& surf, const GpuMat& img, const GpuMat& mask) :
            CvSURFParams(surf),

            sum(surf.sum), mask1(surf.mask1), maskSum(surf.maskSum), intBuffer(surf.intBuffer), det(surf.det), trace(surf.trace),

            maxPosBuffer(surf.maxPosBuffer), 

            img_cols(img.cols), img_rows(img.rows),

            use_mask(!mask.empty())
        {
            CV_Assert(!img.empty() && img.type() == CV_8UC1);
            CV_Assert(mask.empty() || (mask.size() == img.size() && mask.type() == CV_8UC1));
            CV_Assert(nOctaves > 0 && nOctaveLayers > 0);
            CV_Assert(TargetArchs::builtWith(GLOBAL_ATOMICS) && DeviceInfo().supports(GLOBAL_ATOMICS));

            maxFeatures = min(static_cast<int>(img.size().area() * surf.keypointsRatio), 65535);
            maxCandidates = min(static_cast<int>(1.5 * maxFeatures), 65535);

            CV_Assert(maxFeatures > 0);

            counters.create(1, nOctaves + 1, CV_32SC1);
            counters.setTo(Scalar::all(0));

            uploadConstant("cv::gpu::surf::c_max_candidates",    maxCandidates);
            uploadConstant("cv::gpu::surf::c_max_features",      maxFeatures);
            uploadConstant("cv::gpu::surf::c_img_rows",          img_rows);
            uploadConstant("cv::gpu::surf::c_img_cols",          img_cols);
            uploadConstant("cv::gpu::surf::c_nOctaveLayers",     nOctaveLayers);
            uploadConstant("cv::gpu::surf::c_hessianThreshold",  static_cast<float>(hessianThreshold));

            imgTex.bind("cv::gpu::surf::imgTex", (DevMem2D)img);

            integralBuffered(img, sum, intBuffer);
            sumTex.bind("cv::gpu::surf::sumTex", (DevMem2D_<unsigned int>)sum);

            if (use_mask)
            {
                min(mask, 1.0, mask1);
                integralBuffered(mask1, maskSum, intBuffer);

                maskSumTex.bind("cv::gpu::surf::maskSumTex", (DevMem2D_<unsigned int>)maskSum);
            }
        }

        void detectKeypoints(GpuMat& keypoints)
        {
            ensureSizeIsEnough(img_rows * (nOctaveLayers + 2), img_cols, CV_32FC1, det);
            ensureSizeIsEnough(img_rows * (nOctaveLayers + 2), img_cols, CV_32FC1, trace);
            
            ensureSizeIsEnough(1, maxCandidates, CV_32SC4, maxPosBuffer);
            ensureSizeIsEnough(SURF_GPU::SF_FEATURE_STRIDE, maxFeatures, CV_32FC1, keypoints);
            keypoints.setTo(Scalar::all(0));

            for (int octave = 0; octave < nOctaves; ++octave)
            {
                const int layer_rows = img_rows >> octave;
                const int layer_cols = img_cols >> octave;

                uploadConstant("cv::gpu::surf::c_octave",     octave);
                uploadConstant("cv::gpu::surf::c_layer_rows", layer_rows);
                uploadConstant("cv::gpu::surf::c_layer_cols", layer_cols);

                icvCalcLayerDetAndTrace_gpu(det, trace, img_rows, img_cols, octave, nOctaveLayers);

                icvFindMaximaInLayer_gpu(det, trace, maxPosBuffer.ptr<int4>(), counters.ptr<unsigned int>() + 1 + octave,
                    img_rows, img_cols, octave, use_mask, nOctaveLayers);

                unsigned int maxCounter;
                cudaSafeCall( cudaMemcpy(&maxCounter, counters.ptr<unsigned int>() + 1 + octave, sizeof(unsigned int), cudaMemcpyDeviceToHost) );
                maxCounter = std::min(maxCounter, static_cast<unsigned int>(maxCandidates));

                if (maxCounter > 0)
                {
                    icvInterpolateKeypoint_gpu(det, maxPosBuffer.ptr<int4>(), maxCounter, 
                        keypoints.ptr<float>(SURF_GPU::SF_X), keypoints.ptr<float>(SURF_GPU::SF_Y),
                        keypoints.ptr<int>(SURF_GPU::SF_LAPLACIAN), keypoints.ptr<float>(SURF_GPU::SF_SIZE),
                        keypoints.ptr<float>(SURF_GPU::SF_HESSIAN), counters.ptr<unsigned int>());
                }
            }
            unsigned int featureCounter;
            cudaSafeCall( cudaMemcpy(&featureCounter, counters.ptr<unsigned int>(), sizeof(unsigned int), cudaMemcpyDeviceToHost) );
            featureCounter = std::min(featureCounter, static_cast<unsigned int>(maxFeatures));

            keypoints.cols = featureCounter;

            if (!upright)
                findOrientation(keypoints);
        }

        void findOrientation(GpuMat& keypoints)
        {
            const int nFeatures = keypoints.cols;
            if (nFeatures > 0)
            {
                icvCalcOrientation_gpu(keypoints.ptr<float>(SURF_GPU::SF_X), keypoints.ptr<float>(SURF_GPU::SF_Y),
                    keypoints.ptr<float>(SURF_GPU::SF_SIZE), keypoints.ptr<float>(SURF_GPU::SF_DIR), nFeatures);
            }
        }

        void computeDescriptors(const GpuMat& keypoints, GpuMat& descriptors, int descriptorSize)
        {
            const int nFeatures = keypoints.cols;
            if (nFeatures > 0)
            {
                ensureSizeIsEnough(nFeatures, descriptorSize, CV_32F, descriptors);
                compute_descriptors_gpu(descriptors, keypoints.ptr<float>(SURF_GPU::SF_X), keypoints.ptr<float>(SURF_GPU::SF_Y),
                    keypoints.ptr<float>(SURF_GPU::SF_SIZE), keypoints.ptr<float>(SURF_GPU::SF_DIR), nFeatures);
            }
        }

    private:
        GpuMat& sum;
        GpuMat& mask1;
        GpuMat& maskSum;
        GpuMat& intBuffer;

        GpuMat& det;
        GpuMat& trace;

        GpuMat& maxPosBuffer;

        int img_cols, img_rows;

        bool use_mask;

        int maxCandidates;
        int maxFeatures;

        GpuMat counters;

        TextureBinder imgTex, sumTex, maskSumTex;
    };
}

cv::gpu::SURF_GPU::SURF_GPU()
{
    hessianThreshold = 100;
    extended = 1;
    nOctaves = 4;
    nOctaveLayers = 2;
    keypointsRatio = 0.01f;
    upright = false;
}

cv::gpu::SURF_GPU::SURF_GPU(double _threshold, int _nOctaves, int _nOctaveLayers, bool _extended, float _keypointsRatio, bool _upright)
{
    hessianThreshold = _threshold;
    extended = _extended;
    nOctaves = _nOctaves;
    nOctaveLayers = _nOctaveLayers;
    keypointsRatio = _keypointsRatio;
    upright = _upright;
}

int cv::gpu::SURF_GPU::descriptorSize() const
{
    return extended ? 128 : 64;
}

void cv::gpu::SURF_GPU::uploadKeypoints(const vector<KeyPoint>& keypoints, GpuMat& keypointsGPU)
{
    if (keypoints.empty())
        keypointsGPU.release();
    else
    {
        Mat keypointsCPU(SURF_GPU::SF_FEATURE_STRIDE, static_cast<int>(keypoints.size()), CV_32FC1);

        float* kp_x = keypointsCPU.ptr<float>(SURF_GPU::SF_X);
        float* kp_y = keypointsCPU.ptr<float>(SURF_GPU::SF_Y);
        int* kp_laplacian = keypointsCPU.ptr<int>(SURF_GPU::SF_LAPLACIAN);
        float* kp_size = keypointsCPU.ptr<float>(SURF_GPU::SF_SIZE);
        float* kp_dir = keypointsCPU.ptr<float>(SURF_GPU::SF_DIR);
        float* kp_hessian = keypointsCPU.ptr<float>(SURF_GPU::SF_HESSIAN);

        for (size_t i = 0, size = keypoints.size(); i < size; ++i)
        {
            const KeyPoint& kp = keypoints[i];
            kp_x[i] = kp.pt.x;
            kp_y[i] = kp.pt.y;
            kp_size[i] = kp.size;
            kp_dir[i] = kp.angle;
            kp_hessian[i] = kp.response;
            kp_laplacian[i] = 1;
        }

        keypointsGPU.upload(keypointsCPU);
    }
}

namespace
{
    int calcSize(int octave, int layer)
    {
        /* Wavelet size at first layer of first octave. */
        const int HAAR_SIZE0 = 9;

        /* Wavelet size increment between layers. This should be an even number,
         such that the wavelet sizes in an octave are either all even or all odd.
         This ensures that when looking for the neighbours of a sample, the layers
         above and below are aligned correctly. */
        const int HAAR_SIZE_INC = 6;

        return (HAAR_SIZE0 + HAAR_SIZE_INC * layer) << octave;
    }

    int getPointOctave(float size, const CvSURFParams& params)
    {
        int best_octave = 0;
        float min_diff = numeric_limits<float>::max();
        for (int octave = 1; octave < params.nOctaves; ++octave)
        {
            for (int layer = 0; layer < params.nOctaveLayers; ++layer)
            {
                float diff = std::abs(size - (float)calcSize(octave, layer));
                if (min_diff > diff)
                {
                    min_diff = diff;
                    best_octave = octave;
                    if (min_diff == 0)
                        return best_octave;
                }
            }
        }
        return best_octave;
    }
}

void cv::gpu::SURF_GPU::downloadKeypoints(const GpuMat& keypointsGPU, vector<KeyPoint>& keypoints)
{
    const int nFeatures = keypointsGPU.cols;

    if (nFeatures == 0)
        keypoints.clear();
    else
    {
        CV_Assert(keypointsGPU.type() == CV_32FC1 && keypointsGPU.rows == SF_FEATURE_STRIDE);
        
        Mat keypointsCPU = keypointsGPU;
        
        keypoints.resize(nFeatures);

        float* kp_x = keypointsCPU.ptr<float>(SF_X);
        float* kp_y = keypointsCPU.ptr<float>(SF_Y);
        int* kp_laplacian = keypointsCPU.ptr<int>(SF_LAPLACIAN);
        float* kp_size = keypointsCPU.ptr<float>(SF_SIZE);
        float* kp_dir = keypointsCPU.ptr<float>(SF_DIR);
        float* kp_hessian = keypointsCPU.ptr<float>(SF_HESSIAN);

        for (int i = 0; i < nFeatures; ++i)
        {
            KeyPoint& kp = keypoints[i];
            kp.pt.x = kp_x[i];
            kp.pt.y = kp_y[i];
            kp.class_id = kp_laplacian[i];
            kp.size = kp_size[i];
            kp.angle = kp_dir[i];
            kp.response = kp_hessian[i];
            kp.octave = getPointOctave(kp.size, *this);
        }
    }
}

void cv::gpu::SURF_GPU::downloadDescriptors(const GpuMat& descriptorsGPU, vector<float>& descriptors)
{
    if (descriptorsGPU.empty())
        descriptors.clear();
    else
    {
        CV_Assert(descriptorsGPU.type() == CV_32F);

        descriptors.resize(descriptorsGPU.rows * descriptorsGPU.cols);
        Mat descriptorsCPU(descriptorsGPU.size(), CV_32F, &descriptors[0]);
        descriptorsGPU.download(descriptorsCPU);
    }
}

void cv::gpu::SURF_GPU::operator()(const GpuMat& img, const GpuMat& mask, GpuMat& keypoints)
{
    if (!img.empty())
    {
        SURF_GPU_Invoker surf(*this, img, mask);

        surf.detectKeypoints(keypoints);
    }
}

void cv::gpu::SURF_GPU::operator()(const GpuMat& img, const GpuMat& mask, GpuMat& keypoints, GpuMat& descriptors, 
                                   bool useProvidedKeypoints)
{
    if (!img.empty())
    {
        SURF_GPU_Invoker surf(*this, img, mask);
    
        if (!useProvidedKeypoints)
            surf.detectKeypoints(keypoints);
        else if (!upright)
        {
            surf.findOrientation(keypoints);
        }

        surf.computeDescriptors(keypoints, descriptors, descriptorSize());
    }
}

void cv::gpu::SURF_GPU::operator()(const GpuMat& img, const GpuMat& mask, vector<KeyPoint>& keypoints)
{
    GpuMat keypointsGPU;

    (*this)(img, mask, keypointsGPU);

    downloadKeypoints(keypointsGPU, keypoints);
}

void cv::gpu::SURF_GPU::operator()(const GpuMat& img, const GpuMat& mask, vector<KeyPoint>& keypoints, 
    GpuMat& descriptors, bool useProvidedKeypoints)
{
    GpuMat keypointsGPU;

    if (useProvidedKeypoints)
        uploadKeypoints(keypoints, keypointsGPU);    

    (*this)(img, mask, keypointsGPU, descriptors, useProvidedKeypoints);

    downloadKeypoints(keypointsGPU, keypoints);
}

void cv::gpu::SURF_GPU::operator()(const GpuMat& img, const GpuMat& mask, vector<KeyPoint>& keypoints, 
    vector<float>& descriptors, bool useProvidedKeypoints)
{
    GpuMat descriptorsGPU;

    (*this)(img, mask, keypoints, descriptorsGPU, useProvidedKeypoints);

    downloadDescriptors(descriptorsGPU, descriptors);
}

void cv::gpu::SURF_GPU::releaseMemory() 
{
    sum.release(); 
    mask1.release();
    maskSum.release();
    intBuffer.release();
    det.release();
    trace.release();
    maxPosBuffer.release();
}

#endif /* !defined (HAVE_CUDA) */