Refreshed OpenCL sample for Android.

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

@@ -1,12 +1,4 @@
 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)
@@ -14,12 +6,10 @@ else()
   set(native_deps opencv_imgproc)
 endif()
 
-include_directories(${ANDROID_OPENCL_SDK}/include)
-link_directories(${ANDROID_OPENCL_SDK}/lib/${ANDROID_NDK_ABI_NAME})
 add_android_project(${sample} "${CMAKE_CURRENT_SOURCE_DIR}"
     LIBRARY_DEPS "${OPENCV_ANDROID_LIB_DIR}"
     SDK_TARGET 21 "${ANDROID_SDK_TARGET}"
-    NATIVE_DEPS ${native_deps} -lGLESv2 -lEGL -lOpenCL
+    NATIVE_DEPS ${native_deps} -lGLESv2 -lEGL
     COPY_LIBS YES
 )
 if(TARGET ${sample})

samples/android/tutorial-4-opencl/build.gradle.in

@@ -53,8 +53,10 @@ android {
 dependencies {
     //implementation fileTree(dir: 'libs', include: ['*.jar'])
     if (gradle.opencv_source == "sdk_path") {
+        println 'Using OpenCV from SDK'
         implementation project(':opencv')
     } else if (gradle.opencv_source == "maven_local" || gradle.opencv_source == "maven_cenral") {
+        println 'Using OpenCV from Maven repo'
         implementation 'org.opencv:opencv:@OPENCV_VERSION_PLAIN@'
     }
 }

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"

samples/android/tutorial-4-opencl/res/menu/menu.xml

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:android="http://schemas.android.com/apk/res/android" >
-    <group android:checkableBehavior="single">
-        <item android:id="@+id/no_proc" android:title="No processing" />
-        <item android:id="@+id/cpu" android:title="Use CPU code" />
-        <item android:id="@+id/ocl_direct" android:title="Use OpenCL direct" />
-        <item android:id="@+id/ocl_ocv" android:title="Use OpenCL via OpenCV" />
-    </group>
-</menu>

samples/android/tutorial-4-opencl/src/org/opencv/samples/tutorial4/MyGLSurfaceView.java

@@ -65,7 +65,8 @@ public class MyGLSurfaceView extends CameraGLSurfaceView implements CameraGLSurf
                 Toast.makeText(getContext(), "onCameraViewStarted", Toast.LENGTH_SHORT).show();
             }
         });
-        NativePart.initCL();
+        if (NativePart.builtWithOpenCL())
+            NativePart.initCL();
         frameCounter = 0;
         lastNanoTime = System.nanoTime();
     }

samples/android/tutorial-4-opencl/src/org/opencv/samples/tutorial4/NativePart.java

@@ -12,6 +12,7 @@ public class NativePart {
     public static final int PROCESSING_MODE_OCL_DIRECT = 2;
     public static final int PROCESSING_MODE_OCL_OCV = 3;
 
+    public static native boolean builtWithOpenCL();
     public static native int initCL();
     public static native void closeCL();
     public static native void processFrame(int tex1, int tex2, int w, int h, int mode);

samples/android/tutorial-4-opencl/src/org/opencv/samples/tutorial4/Tutorial4Activity.java

@@ -1,6 +1,5 @@
 package org.opencv.samples.tutorial4;
 
-import android.app.Activity;
 import android.content.pm.ActivityInfo;
 import android.os.Bundle;
 import android.view.Menu;
@@ -10,11 +9,20 @@ import android.view.Window;
 import android.view.WindowManager;
 import android.widget.TextView;
 
-public class Tutorial4Activity extends Activity {
+import org.opencv.android.CameraActivity;
+
+public class Tutorial4Activity extends CameraActivity {
 
     private MyGLSurfaceView mView;
     private TextView mProcMode;
 
+    private boolean builtWithOpenCL = false;
+
+    private MenuItem mItemNoProc;
+    private MenuItem mItemCpu;
+    private MenuItem mItemOclDirect;
+    private MenuItem mItemOclOpenCV;
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -38,6 +46,7 @@ public class Tutorial4Activity extends Activity {
             }
         });
 
+        builtWithOpenCL = NativePart.builtWithOpenCL();
         mView.setProcessingMode(NativePart.PROCESSING_MODE_NO_PROCESSING);
     }
 
@@ -55,48 +64,37 @@ public class Tutorial4Activity extends Activity {
 
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
-        MenuInflater inflater = getMenuInflater();
-        inflater.inflate(R.menu.menu, menu);
-        return super.onCreateOptionsMenu(menu);
+        mItemNoProc = menu.add("No processing");
+        mItemCpu = menu.add("Use CPU code");
+        if (builtWithOpenCL) {
+            mItemOclOpenCV = menu.add("Use OpenCL via OpenCV");
+            mItemOclDirect = menu.add("Use OpenCL direct");
+        }
+        return true;
     }
 
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
-        switch (item.getItemId()) {
-        case R.id.no_proc:
-            runOnUiThread(new Runnable() {
-                public void run() {
-                    mProcMode.setText("Processing mode: No Processing");
-                }
-            });
-            mView.setProcessingMode(NativePart.PROCESSING_MODE_NO_PROCESSING);
-            return true;
-        case R.id.cpu:
-            runOnUiThread(new Runnable() {
-                public void run() {
-                    mProcMode.setText("Processing mode: CPU");
-                }
-            });
-            mView.setProcessingMode(NativePart.PROCESSING_MODE_CPU);
-            return true;
-        case R.id.ocl_direct:
-            runOnUiThread(new Runnable() {
-                public void run() {
-                    mProcMode.setText("Processing mode: OpenCL direct");
-                }
-            });
-            mView.setProcessingMode(NativePart.PROCESSING_MODE_OCL_DIRECT);
-            return true;
-        case R.id.ocl_ocv:
-            runOnUiThread(new Runnable() {
-                public void run() {
-                    mProcMode.setText("Processing mode: OpenCL via OpenCV (TAPI)");
-                }
-            });
-            mView.setProcessingMode(NativePart.PROCESSING_MODE_OCL_OCV);
-            return true;
-        default:
-            return false;
+        String procName = "Not selected";
+        int procMode = NativePart.PROCESSING_MODE_NO_PROCESSING;
+
+        if (item == mItemNoProc) {
+            procMode = NativePart.PROCESSING_MODE_NO_PROCESSING;
+            procName = "Processing mode: No Processing";
+        } else if (item == mItemCpu) {
+            procMode = NativePart.PROCESSING_MODE_CPU;
+            procName = "Processing mode: CPU";
+        } else if (item == mItemOclOpenCV && builtWithOpenCL) {
+            procMode = NativePart.PROCESSING_MODE_OCL_OCV;
+            procName = "Processing mode: OpenCL via OpenCV (TAPI)";
+        } else if (item == mItemOclDirect && builtWithOpenCL) {
+            procMode = NativePart.PROCESSING_MODE_OCL_DIRECT;
+            procName = "Processing mode: OpenCL direct";
         }
+
+        mView.setProcessingMode(procMode);
+        mProcMode.setText(procName);
+
+        return true;
     }
-}
+}