cmake: refactor OpenCL detection, allow custom configurations

CMakeLists.txt

@@ -1138,14 +1138,13 @@ endif()
 
 if(HAVE_OPENCL)
   status("")
-  status("  OpenCL:")
   if(HAVE_OPENCL_STATIC)
-    set(__opencl_ver "static")
+    set(__opencl_type "<Link with OpenCL library>")
   else()
-    set(__opencl_ver "dynamic")
+    set(__opencl_type "<Dynamic loading of OpenCL library>")
   endif()
-  status("    Version:"       ${__opencl_ver})
-  if(OPENCL_INCLUDE_DIR)
+  status("  OpenCL:"                 ${__opencl_type})
+  if(OPENCL_INCLUDE_DIRS)
     status("    Include path:"       ${OPENCL_INCLUDE_DIRS})
   endif()
   if(OPENCL_LIBRARIES)
@@ -1162,7 +1161,7 @@ if(HAVE_OPENCL)
         list(APPEND __libs "${l}")
       endif()
     endforeach()
-    status("    libraries:"          ${__libs})
+    status("    Link libraries:"          ${__libs})
   endif()
   status("    Use AMDFFT:"           HAVE_CLAMDFFT  THEN YES ELSE NO)
   status("    Use AMDBLAS:"          HAVE_CLAMDBLAS THEN YES ELSE NO)

cmake/OpenCVDetectOpenCL.cmake

+set(OPENCL_FOUND ON CACHE BOOL "OpenCL library is found")
 if(APPLE)
-  set(OPENCL_FOUND YES)
   set(OPENCL_LIBRARY "-framework OpenCL" CACHE STRING "OpenCL library")
-  set(OPENCL_INCLUDE_DIR "" CACHE STRING "OpenCL include directory")
-  mark_as_advanced(OPENCL_INCLUDE_DIR OPENCL_LIBRARY)
-  set(HAVE_OPENCL_STATIC ON)
+  set(OPENCL_INCLUDE_DIR "" CACHE PATH "OpenCL include directory")
 else(APPLE)
-  set(OPENCL_FOUND YES)
-  set(HAVE_OPENCL_STATIC OFF)
-  set(OPENCL_INCLUDE_DIR "${OpenCV_SOURCE_DIR}/3rdparty/include/opencl/1.2")
+  set(OPENCL_LIBRARY "" CACHE STRING "OpenCL library")
+  set(OPENCL_INCLUDE_DIR "${OpenCV_SOURCE_DIR}/3rdparty/include/opencl/1.2" CACHE PATH "OpenCL include directory")
 endif(APPLE)
-
-if(WINRT)
-  set(OPENCL_FOUND NO)
-  set(HAVE_OPENCL_STATIC OFF)
-endif(WINRT)
+mark_as_advanced(OPENCL_INCLUDE_DIR OPENCL_LIBRARY)
 
 if(OPENCL_FOUND)
+  if(OPENCL_LIBRARY)
+    set(HAVE_OPENCL_STATIC ON)
+    set(OPENCL_LIBRARIES "${OPENCL_LIBRARY}")
+  else()
+    set(HAVE_OPENCL_STATIC OFF)
+  endif()
+
   if(NOT HAVE_OPENCL_STATIC)
     try_compile(__VALID_OPENCL
       "${OpenCV_BINARY_DIR}"
@@ -29,20 +29,12 @@ if(OPENCL_FOUND)
     endif()
   endif()
 
-  if(NOT WINRT)
-    set(HAVE_OPENCL 1)
-  endif()
+  set(HAVE_OPENCL 1)
 
   if(WITH_OPENCL_SVM)
     set(HAVE_OPENCL_SVM 1)
   endif()
 
-  if(HAVE_OPENCL_STATIC)
-    set(OPENCL_LIBRARIES "${OPENCL_LIBRARY}")
-  else()
-    unset(OPENCL_LIBRARIES)
-  endif()
-
   set(OPENCL_INCLUDE_DIRS ${OPENCL_INCLUDE_DIR})
 
   if(WITH_OPENCLAMDFFT)

cmake/OpenCVModule.cmake

@@ -701,7 +701,6 @@ macro(ocv_glob_module_sources)
   )
   if(cl_kernels)
     set(OCL_NAME opencl_kernels_${name})
-    ocv_include_directories(${OPENCL_INCLUDE_DIRS})
     add_custom_command(
       OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${OCL_NAME}.cpp" "${CMAKE_CURRENT_BINARY_DIR}/${OCL_NAME}.hpp"
       COMMAND ${CMAKE_COMMAND} "-DMODULE_NAME=${name}" "-DCL_DIR=${CMAKE_CURRENT_LIST_DIR}/src/opencl" "-DOUTPUT=${CMAKE_CURRENT_BINARY_DIR}/${OCL_NAME}.cpp" -P "${OpenCV_SOURCE_DIR}/cmake/cl2cpp.cmake"

modules/core/CMakeLists.txt

@@ -27,7 +27,7 @@ source_group("Cuda Headers\\Detail" FILES ${lib_cuda_hdrs_detail})
 ocv_glob_module_sources(SOURCES "${OPENCV_MODULE_opencv_core_BINARY_DIR}/version_string.inc"
                         HEADERS ${lib_cuda_hdrs} ${lib_cuda_hdrs_detail})
 
-ocv_module_include_directories(${the_module} ${ZLIB_INCLUDE_DIRS})
+ocv_module_include_directories(${the_module} ${ZLIB_INCLUDE_DIRS} ${OPENCL_INCLUDE_DIRS})
 ocv_create_module(${extra_libs})
 
 ocv_add_accuracy_tests()