CMakeLists.txt

# cmake 3.1 needed for find_package(OpenCL)

if(CMAKE_VERSION VERSION_LESS "3.1")
  message(STATUS "OpenCL samples require CMakes 3.1+")
  return()
endif()

set(
    OPENCV_OPENCL_SAMPLES_REQUIRED_DEPS
    opencv_core
    opencv_imgproc
    opencv_video
    opencv_imgcodecs
    opencv_videoio
    opencv_highgui)

ocv_check_dependencies(${OPENCV_OPENCL_SAMPLES_REQUIRED_DEPS})

if(BUILD_EXAMPLES AND OCV_DEPENDENCIES_FOUND)

  find_package(OpenCL 1.2 QUIET)
  if(NOT OpenCL_FOUND)
    message(STATUS "OpenCL samples are skipped: OpenCL SDK is required")
    return()
  endif()

  set(project "opencl")
  string(TOUPPER "${project}" project_upper)

  project("${project}_samples")

  ocv_include_modules_recurse(${OPENCV_OPENCL_SAMPLES_REQUIRED_DEPS})

  include_directories(${OpenCL_INCLUDE_DIR})

  # ---------------------------------------------
  #      Define executable targets
  # ---------------------------------------------
  MACRO(OPENCV_DEFINE_OPENCL_EXAMPLE name srcs)
    set(the_target "example_${project}_${name}")
    add_executable(${the_target} ${srcs})

    ocv_target_link_libraries(
        ${the_target}
        ${OPENCV_LINKER_LIBS}
        ${OPENCV_OPENCL_SAMPLES_REQUIRED_DEPS}
        ${OpenCL_LIBRARY})

    set_target_properties(${the_target} PROPERTIES
      OUTPUT_NAME "${project}-example-${name}"
      PROJECT_LABEL "(EXAMPLE_${project_upper}) ${name}")

    if(ENABLE_SOLUTION_FOLDERS)
      set_target_properties(${the_target} PROPERTIES FOLDER "samples//${project}")
    endif()

    if(WIN32)
      if(MSVC AND NOT BUILD_SHARED_LIBS)
        set_target_properties(${the_target} PROPERTIES LINK_FLAGS "/NODEFAULTLIB:atlthunk.lib /NODEFAULTLIB:atlsd.lib /DEBUG")
      endif()
      install(TARGETS ${the_target} RUNTIME DESTINATION "${OPENCV_SAMPLES_BIN_INSTALL_PATH}/${project}" COMPONENT main)
    endif()
  ENDMACRO()

  file(GLOB all_samples RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.cpp)

  foreach(sample_filename ${all_samples})
    get_filename_component(sample ${sample_filename} NAME_WE)
    file(GLOB sample_srcs RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} ${sample}.*)
    OPENCV_DEFINE_OPENCL_EXAMPLE(${sample} ${sample_srcs})
  endforeach()
endif()