opencv/modules/ocl/test/test_api.cpp

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#include "test_precomp.hpp"
#include "opencv2/ocl/cl_runtime/cl_runtime.hpp" // for OpenCL types: cl_mem

TEST(TestAPI, openCLExecuteKernelInterop)
{
    cv::RNG rng;
    Size sz(10000, 1);
    cv::Mat cpuMat = cvtest::randomMat(rng, sz, CV_32FC4, -10, 10, false);

    cv::ocl::oclMat gpuMat(cpuMat);
    cv::ocl::oclMat gpuMatDst(sz, CV_32FC4);

    const char* kernelStr =
"__kernel void test_kernel(__global float4* src, __global float4* dst) {\n"
"    int x = get_global_id(0);\n"
"    dst[x] = src[x];\n"
"}\n";

    cv::ocl::ProgramSource program("test_interop", kernelStr);

    using namespace std;
    vector<pair<size_t , const void *> > args;
    args.push_back( make_pair( sizeof(cl_mem), (void *) &gpuMat.data ));
    args.push_back( make_pair( sizeof(cl_mem), (void *) &gpuMatDst.data ));

    size_t globalThreads[3] = { sz.width, 1, 1 };
    cv::ocl::openCLExecuteKernelInterop(
        gpuMat.clCxt,
        program,
        "test_kernel",
        globalThreads, NULL, args,
        -1, -1,
        "");

    cv::Mat dst;
    gpuMatDst.download(dst);

    EXPECT_LE(checkNorm(cpuMat, dst), 1e-3);
}