tutorial-4-opencl: enable build with OpenCV

samples/android/CMakeLists.txt

@@ -14,6 +14,7 @@ add_subdirectory(color-blob-detection)
 add_subdirectory(tutorial-1-camerapreview)
 add_subdirectory(tutorial-2-mixedprocessing)
 add_subdirectory(tutorial-3-cameracontrol)
+add_subdirectory(tutorial-4-opencl)
 
 # hello-android sample
 if(HAVE_opencv_highgui)

samples/android/tutorial-4-opencl/CMakeLists.txt

 set(sample example-tutorial-4-opencl)
+if(NOT DEFINED ANDROID_OPENCL_SDK)
+  message(STATUS "Sample ${sample} is disabled, because ANDROID_OPENCL_SDK is not specified")
+  return()
+endif()
+if(ANDROID_NATIVE_API_LEVEL LESS 14)
+  message(STATUS "Sample ${sample} is disabled, because ANDROID_NATIVE_API_LEVEL < 14")
+  return()
+endif()
 
 if(BUILD_FAT_JAVA_LIB)
   set(native_deps opencv_java)
@@ -6,7 +14,13 @@ else()
   set(native_deps opencv_imgproc)
 endif()
 
-add_android_project(${sample} "${CMAKE_CURRENT_SOURCE_DIR}" LIBRARY_DEPS ${OpenCV_BINARY_DIR} SDK_TARGET 21 ${ANDROID_SDK_TARGET} NATIVE_DEPS ${native_deps})
+include_directories(${ANDROID_OPENCL_SDK}/include)
+link_directories(${ANDROID_OPENCL_SDK}/lib/${ANDROID_ABI})
+add_android_project(${sample} "${CMAKE_CURRENT_SOURCE_DIR}"
+    LIBRARY_DEPS ${OpenCV_BINARY_DIR}
+    SDK_TARGET 21 ${ANDROID_SDK_TARGET}
+    NATIVE_DEPS ${native_deps} -lGLESv2 -lEGL -lOpenCL
+)
 if(TARGET ${sample})
   add_dependencies(opencv_android_examples ${sample})
 endif()

samples/android/tutorial-4-opencl/jni/Android.mk

@@ -13,6 +13,10 @@ else
   include ../../sdk/native/jni/OpenCV.mk
 endif
 
+ifndef OPENCL_SDK
+  $(error Specify OPENCL_SDK to Android OpenCL SDK location)
+endif
+
 # add OpenCL
 LOCAL_C_INCLUDES += $(OPENCL_SDK)/include
 LOCAL_LDLIBS += -L$(OPENCL_SDK)/lib/$(TARGET_ARCH_ABI) -lOpenCL

samples/android/tutorial-4-opencl/jni/CLprocessor.cpp

@@ -3,7 +3,8 @@
 
 #include <EGL/egl.h>
 
-#include <opencv2/opencv.hpp>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
 #include <opencv2/core/ocl.hpp>
 
 #include "common.hpp"

samples/android/tutorial-4-opencl/jni/GLrender.cpp

 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
-#include <opencv2/opencv.hpp>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
 
 #include "common.hpp"