Put the cl_image support detection in utils

modules/ocl/src/mcwutil.cpp

@@ -221,6 +221,36 @@ namespace cv
         {
             openCLFree(texture);
         }
+
+        bool support_image2d(Context *clCxt)
+        {
+            static const char * _kernel_string = "__kernel void test_func(image2d_t img) {}";
+            static bool _isTested = false;
+            static bool _support = false;
+            if(_isTested)
+            {
+                return _support;
+            }
+            try
+            {
+                cv::ocl::openCLGetKernelFromSource(clCxt, &_kernel_string, "test_func");
+                _support = true;
+            }
+            catch (const cv::Exception& e)
+            {
+                if(e.code == -217)
+                {
+                    _support = false;
+                }
+                else
+                {
+                    // throw e once again
+                    throw e;
+                }
+            }
+            _isTested = true;
+            return _support;
+        }
     }//namespace ocl
 
 }//namespace cv

modules/ocl/src/mcwutil.hpp

@@ -70,6 +70,10 @@ namespace cv
         //   2. for faster clamping, there is no buffer padding for the constructed texture
         cl_mem bindTexture(const oclMat &mat);
         void releaseTexture(cl_mem& texture);
+
+        // returns whether the current context supports image2d_t format or not
+        bool support_image2d(Context *clCxt = Context::getContext());
+
     }//namespace ocl
 
 }//namespace cv

modules/ocl/src/surf.cpp

@@ -83,36 +83,6 @@ static inline int calcSize(int octave, int layer)
 namespace
 {
     const char* noImage2dOption = "-D DISABLE_IMAGE2D";
-
-    // default kernel name can be any kernel in nonfree_surf.cl
-    bool support_image2d(const char* kernel_name = "icvCalcLayerDetAndTrace")
-    {
-        static bool _isTested = false;
-        static bool _support = false;
-        if(_isTested)
-        {
-            return _support;
-        }
-        try
-        {
-            cv::ocl::openCLGetKernelFromSource(Context::getContext(), &nonfree_surf, kernel_name);
-            _support = true;
-        }
-        catch (cv::Exception& e)
-        {
-            if(e.code == -217)
-            {
-                _support = false;
-            }
-            else
-            {
-                // throw e once again
-                cv::error(e);
-            }
-        }
-        _isTested = true;
-        return _support;
-    }
 }
 
 class SURF_OCL_Invoker