Refreshed OpenCL sample for Android.

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

@@ -1,6 +1,8 @@
+#ifdef OPENCL_FOUND
 #define __CL_ENABLE_EXCEPTIONS
 #define CL_USE_DEPRECATED_OPENCL_1_1_APIS /*let's give a chance for OpenCL 1.1 devices*/
 #include <CL/cl.hpp>
+#endif
 
 #include <GLES2/gl2.h>
 #include <EGL/egl.h>
@@ -10,7 +12,9 @@
 #include <opencv2/core/ocl.hpp>
 
 #include "common.hpp"
+#include "CLprocessor.hpp"
 
+#ifdef OPENCL_FOUND
 const char oclProgB2B[] = "// clBuffer to clBuffer";
 const char oclProgI2B[] = "// clImage to clBuffer";
 const char oclProgI2I[] = \
@@ -33,7 +37,7 @@ const char oclProgI2I[] = \
     "    write_imagef(imgOut, pos, sum*10); \n" \
     "} \n";
 
-void dumpCLinfo()
+static void dumpCLinfo()
 {
     LOGD("*** OpenCL info ***");
     try
@@ -83,7 +87,7 @@ cl::CommandQueue theQueue;
 cl::Program theProgB2B, theProgI2B, theProgI2I;
 bool haveOpenCL = false;
 
-extern "C" void initCL()
+int initCL()
 {
     dumpCLinfo();
 
@@ -133,20 +137,24 @@ extern "C" void initCL()
     catch(const cl::Error& e)
     {
         LOGE("cl::Error: %s (%d)", e.what(), e.err());
+        return 1;
     }
     catch(const std::exception& e)
     {
         LOGE("std::exception: %s", e.what());
+        return 2;
     }
     catch(...)
     {
         LOGE( "OpenCL info: unknown error while initializing OpenCL stuff" );
+        return 3;
     }
     LOGD("initCL completed");
-}
 
-extern "C" void closeCL()
-{
+    if (haveOpenCL)
+        return 0;
+    else
+        return 4;
 }
 
 #define GL_TEXTURE_2D 0x0DE1
@@ -230,6 +238,16 @@ void procOCL_OCV(int texIn, int texOut, int w, int h)
     cv::ocl::finish();
     LOGD("uploading results to texture costs %d ms", getTimeInterval(t));
 }
+#else
+int initCL()
+{
+    return 5;
+}
+#endif
+
+void closeCL()
+{
+}
 
 void drawFrameProcCPU(int w, int h, int texOut)
 {
@@ -263,7 +281,7 @@ void drawFrameProcCPU(int w, int h, int texOut)
 
 enum ProcMode {PROC_MODE_NO_PROC=0, PROC_MODE_CPU=1, PROC_MODE_OCL_DIRECT=2, PROC_MODE_OCL_OCV=3};
 
-extern "C" void processFrame(int tex1, int tex2, int w, int h, int mode)
+void processFrame(int tex1, int tex2, int w, int h, int mode)
 {
     switch(mode)
     {
@@ -271,12 +289,14 @@ extern "C" void processFrame(int tex1, int tex2, int w, int h, int mode)
     case PROC_MODE_CPU:
         drawFrameProcCPU(w, h, tex2);
         break;
+#ifdef OPENCL_FOUND
     case PROC_MODE_OCL_DIRECT:
         procOCL_I2I(tex1, tex2, w, h);
         break;
     case PROC_MODE_OCL_OCV:
         procOCL_OCV(tex1, tex2, w, h);
         break;
+#endif
     default:
         LOGE("Unexpected processing mode: %d", mode);
     }

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

@@ -0,0 +1,8 @@
+#ifndef __CL_PROCESSOR_HPP__
+#define __CL_PROCESSOR_HPP__
+
+int initCL();
+void closeCL();
+void processFrame(int tex1, int tex2, int w, int h, int mode);
+
+#endif

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

@@ -4,17 +4,32 @@ set(target JNIpart)
 project(${target} CXX)
 
 if (OPENCV_FROM_SDK)
+  message(STATUS "Using OpenCV from local SDK")
   set(ANDROID_OPENCV_COMPONENTS "opencv_java" CACHE STRING "")
 else()
+  message(STATUS "Using OpenCV from AAR (Maven repo)")
   set(ANDROID_OPENCV_COMPONENTS "OpenCV::opencv_java${OPENCV_VERSION_MAJOR}" CACHE STRING "")
 endif()
 
 message(STATUS "ANDROID_ABI=${ANDROID_ABI}")
 find_package(OpenCV REQUIRED COMPONENTS ${ANDROID_OPENCV_COMPONENTS})
+find_package(OpenCL QUIET)
 
 file(GLOB srcs *.cpp *.c)
 file(GLOB hdrs *.hpp *.h)
 
 include_directories("${CMAKE_CURRENT_LIST_DIR}")
 add_library(${target} SHARED ${srcs} ${hdrs})
-target_link_libraries(${target} ${ANDROID_OPENCV_COMPONENTS} -lGLESv2 -lEGL -lOpenCL)
+
+target_link_libraries(${target} ${ANDROID_OPENCV_COMPONENTS} -lGLESv2 -lEGL -llog)
+
+if(OpenCL_FOUND)
+  include_directories(${OpenCL_INCLUDE_DIRS})
+  target_link_libraries(${OpenCL_LIBRARIES})
+  add_definitions("-DOPENCL_FOUND")
+elseif(DEFINED ANDROID_OPENCL_SDK)
+  include_directories(${ANDROID_OPENCL_SDK}/include)
+  link_directories(${ANDROID_OPENCL_SDK}/lib/${ANDROID_NDK_ABI_NAME})
+  target_link_libraries(-lOpenCL)
+  add_definitions("-DOPENCL_FOUND")
+endif()

samples/android/tutorial-4-opencl/jni/jni.c

@@ -1,20 +0,0 @@
-#include <jni.h>
-
-int initCL();
-void closeCL();
-void processFrame(int tex1, int tex2, int w, int h, int mode);
-
-JNIEXPORT jint JNICALL Java_org_opencv_samples_tutorial4_NativePart_initCL(JNIEnv * env, jclass cls)
-{
-    return initCL();
-}
-
-JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial4_NativePart_closeCL(JNIEnv * env, jclass cls)
-{
-    closeCL();
-}
-
-JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial4_NativePart_processFrame(JNIEnv * env, jclass cls, jint tex1, jint tex2, jint w, jint h, jint mode)
-{
-    processFrame(tex1, tex2, w, h, mode);
-}

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

@@ -0,0 +1,36 @@
+#include <jni.h>
+#include "CLprocessor.hpp"
+
+extern "C" {
+JNIEXPORT jboolean JNICALL Java_org_opencv_samples_tutorial4_NativePart_builtWithOpenCL(JNIEnv * env, jclass cls);
+
+JNIEXPORT jint JNICALL Java_org_opencv_samples_tutorial4_NativePart_initCL(JNIEnv * env, jclass cls);
+
+JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial4_NativePart_closeCL(JNIEnv * env, jclass cls);
+
+JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial4_NativePart_processFrame(JNIEnv * env, jclass cls, jint tex1, jint tex2, jint w, jint h, jint mode);
+
+JNIEXPORT jboolean JNICALL Java_org_opencv_samples_tutorial4_NativePart_builtWithOpenCL(JNIEnv * env, jclass cls)
+{
+#ifdef OPENCL_FOUND
+    return JNI_TRUE;
+#else
+    return JNI_FALSE;
+#endif
+}
+
+JNIEXPORT jint JNICALL Java_org_opencv_samples_tutorial4_NativePart_initCL(JNIEnv * env, jclass cls)
+{
+    return initCL();
+}
+
+JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial4_NativePart_closeCL(JNIEnv * env, jclass cls)
+{
+    closeCL();
+}
+
+JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial4_NativePart_processFrame(JNIEnv * env, jclass cls, jint tex1, jint tex2, jint w, jint h, jint mode)
+{
+    processFrame(tex1, tex2, w, h, mode);
+}
+} // extern "C"