/*M///////////////////////////////////////////////////////////////////////////////////////
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//                           License Agreement
//                For Open Source Computer Vision Library
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// Copyright (C) 2010-2012, Multicoreware, Inc., all rights reserved.
// Copyright (C) 2010-2012, Advanced Micro Devices, Inc., all rights reserved.
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// @Authors
//        Dachuan Zhao, dachuan@multicorewareinc.com
//        Yao Wang, yao@multicorewareinc.com
//
//
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//M*/
#include "precomp.hpp"
#include "opencl_kernels.hpp"

using namespace cv;
using namespace cv::ocl;

//////////////////////////////////////////////////////////////////////////////
/////////////////////// add subtract multiply divide /////////////////////////
//////////////////////////////////////////////////////////////////////////////
static void pyrdown_run(const oclMat &src, const oclMat &dst)
{

    CV_Assert(src.type() == dst.type());
    CV_Assert(src.depth() != CV_8S);

    Context  *clCxt = src.clCxt;
    string kernelName = "pyrDown";

    size_t localThreads[3]  = { 256, 1, 1 };
    size_t globalThreads[3] = { src.cols, dst.rows, 1};

    vector<pair<size_t , const void *> > args;
    args.push_back( make_pair( sizeof(cl_mem), (void *)&src.data ));
    args.push_back( make_pair( sizeof(cl_int), (void *)&src.step ));
    args.push_back( make_pair( sizeof(cl_int), (void *)&src.rows));
    args.push_back( make_pair( sizeof(cl_int), (void *)&src.cols));
    args.push_back( make_pair( sizeof(cl_mem), (void *)&dst.data ));
    args.push_back( make_pair( sizeof(cl_int), (void *)&dst.step ));
    args.push_back( make_pair( sizeof(cl_int), (void *)&dst.cols));

    openCLExecuteKernel(clCxt, &pyr_down, kernelName, globalThreads, localThreads, args, src.oclchannels(), src.depth());
}
//////////////////////////////////////////////////////////////////////////////
// pyrDown

void cv::ocl::pyrDown(const oclMat &src, oclMat &dst)
{
    int depth = src.depth(), channels = src.channels();
    CV_Assert(depth == CV_8U || depth == CV_16U || depth == CV_16S || depth == CV_32F);
    CV_Assert(channels == 1 || channels == 3 || channels == 4);

    dst.create((src.rows + 1) / 2, (src.cols + 1) / 2, src.type());

    pyrdown_run(src, dst);
}
