adding `NO_PROCESSING` (i.e. just preview) mode

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

@@ -79,6 +79,7 @@ void dumpCLinfo()
 cl::Context theContext;
 cl::CommandQueue theQueue;
 cl::Program theProgB2B, theProgI2B, theProgI2I;
+bool haveOpenCL = false;
 
 void initCL()
 {
@@ -100,6 +101,7 @@ void initCL()
 
     try
     {
+        haveOpenCL = false;
         cl::Platform p = cl::Platform::getDefault();
         std::string ext = p.getInfo<CL_PLATFORM_EXTENSIONS>();
         if(ext.find("cl_khr_gl_sharing") == std::string::npos)
@@ -124,6 +126,7 @@ void initCL()
             LOGD("OpenCV+OpenCL works OK!");
         else
             LOGE("Can't init OpenCV with OpenCL TAPI");
+        haveOpenCL = true;
     }
     catch(cl::Error& e)
     {
@@ -147,6 +150,8 @@ void closeCL()
 #define GL_TEXTURE_2D 0x0DE1
 void procOCL_I2I(int texIn, int texOut, int w, int h)
 {
+    if(!haveOpenCL) return;
+
     LOGD("procOCL_I2I(%d, %d, %d, %d)", texIn, texOut, w, h);
     cl::ImageGL imgIn (theContext, CL_MEM_READ_ONLY,  GL_TEXTURE_2D, 0, texIn);
     cl::ImageGL imgOut(theContext, CL_MEM_WRITE_ONLY, GL_TEXTURE_2D, 0, texOut);
@@ -179,6 +184,8 @@ void procOCL_I2I(int texIn, int texOut, int w, int h)
 
 void procOCL_OCV(int tex, int w, int h)
 {
+    if(!haveOpenCL) return;
+
     int64_t t = getTimeMs();
     cl::ImageGL imgIn (theContext, CL_MEM_READ_ONLY,  GL_TEXTURE_2D, 0, tex);
     std::vector < cl::Memory > images(1, imgIn);

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

@@ -63,9 +63,9 @@ GLuint FBO = 0;
 GLuint texOES = 0;
 int texWidth = 0, texHeight = 0;
 
-enum ProcMode {PROC_MODE_CPU=1, PROC_MODE_OCL_DIRECT=2, PROC_MODE_OCL_OCV=3};
+enum ProcMode {PROC_MODE_NO_PROC=0, PROC_MODE_CPU=1, PROC_MODE_OCL_DIRECT=2, PROC_MODE_OCL_OCV=3};
 
-ProcMode procMode = PROC_MODE_CPU;
+ProcMode procMode = PROC_MODE_NO_PROC;
 
 static inline void deleteTex(GLuint* tex)
 {
@@ -298,6 +298,7 @@ extern "C" void drawFrame()
 
     switch(procMode)
     {
+    case PROC_MODE_NO_PROC:    drawFrameOrig();       break;
     case PROC_MODE_CPU:        drawFrameProcCPU();    break;
     case PROC_MODE_OCL_DIRECT: drawFrameProcOCL();    break;
     case PROC_MODE_OCL_OCV:    drawFrameProcOCLOCV(); break;
@@ -366,6 +367,7 @@ extern "C" void setProcessingMode(int mode)
 {
     switch(mode)
     {
+    case PROC_MODE_NO_PROC:    procMode = PROC_MODE_NO_PROC;    break;
     case PROC_MODE_CPU:        procMode = PROC_MODE_CPU;        break;
     case PROC_MODE_OCL_DIRECT: procMode = PROC_MODE_OCL_DIRECT; break;
     case PROC_MODE_OCL_OCV:    procMode = PROC_MODE_OCL_OCV;    break;

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

 <?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" />

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

@@ -7,6 +7,7 @@ public class NativeGLRenderer {
         System.loadLibrary("JNIrender");
     }
 
+    public static final int PROCESSING_MODE_NO_PROCESSING = 0;
     public static final int PROCESSING_MODE_CPU = 1;
     public static final int PROCESSING_MODE_OCL_DIRECT = 2;
     public static final int PROCESSING_MODE_OCL_OCV = 3;

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

@@ -34,11 +34,11 @@ public class Tutorial4Activity extends Activity {
         mProcMode = (TextView)findViewById(R.id.proc_mode_text_view);
         runOnUiThread(new Runnable() {
             public void run() {
-                mProcMode.setText("Processing mode: CPU");
+                mProcMode.setText("Processing mode: No processing");
             }
         });
 
-        NativeGLRenderer.setProcessingMode(NativeGLRenderer.PROCESSING_MODE_CPU);    }
+        NativeGLRenderer.setProcessingMode(NativeGLRenderer.PROCESSING_MODE_NO_PROCESSING);    }
 
     @Override
     protected void onPause() {
@@ -62,6 +62,14 @@ public class Tutorial4Activity extends Activity {
     @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");
+                }
+            });
+            NativeGLRenderer.setProcessingMode(NativeGLRenderer.PROCESSING_MODE_NO_PROCESSING);
+            return true;
         case R.id.cpu:
             runOnUiThread(new Runnable() {
                 public void run() {