fixed gpu samples build

samples/gpu/hog.cpp

@@ -312,7 +312,7 @@ void App::run()
             hogWorkBegin();
             if (use_gpu)
             {
-                gpu_img = img;
+                gpu_img.upload(img);
                 gpu_hog.detectMultiScale(gpu_img, found, hit_threshold, win_stride, 
                                          Size(0, 0), scale, gr_threshold);
             }

samples/gpu/morfology.cpp

@@ -61,8 +61,18 @@ void ErodeDilate(int, void*)
 int main( int argc, char** argv )
 {
     char* filename = argc == 2 ? argv[1] : (char*)"baboon.jpg";
-    if(string(argv[1]) == "--help" || (src = imread(filename,1)).data == 0)
-        return help(), -1;
+    if (string(argv[1]) == "--help")
+    {
+        help();
+        return -1;
+    }
+
+    src.upload(imread(filename, 1));
+    if (src.empty())
+    {
+        help();
+        return -1;
+    }
 
     help();
 

samples/gpu/stereo_match.cpp

@@ -162,8 +162,8 @@ void App::run()
     if (right_src.empty()) throw runtime_error("can't open file \"" + p.right + "\"");
     cvtColor(left_src, left, CV_BGR2GRAY);
     cvtColor(right_src, right, CV_BGR2GRAY);
-    d_left = left;
-    d_right = right;
+    d_left.upload(left);
+    d_right.upload(right);
 
     imshow("left", left);
     imshow("right", right);
@@ -193,8 +193,8 @@ void App::run()
                 cvtColor(left_src, left, CV_BGR2GRAY);
                 cvtColor(right_src, right, CV_BGR2GRAY);
                 cout << "image_channels: " << left.channels() << endl;
-                d_left = left;
-                d_right = right;
+                d_left.upload(left);
+                d_right.upload(right);
                 imshow("left", left);
                 imshow("right", right);
             }
@@ -262,8 +262,8 @@ void App::handleKey(char key)
             cvtColor(left_src, left, CV_BGR2GRAY);
             cvtColor(right_src, right, CV_BGR2GRAY);
         }
-        d_left = left;
-        d_right = right;
+        d_left.upload(left);
+        d_right.upload(right);
         cout << "image_channels: " << left.channels() << endl;
         imshow("left", left);
         imshow("right", right);

samples/gpu/surf_keypoint_matcher.cpp

@@ -28,12 +28,12 @@ int main(int argc, char* argv[])
     {
         if (string(argv[i]) == "--left")
         {
-            img1 = imread(argv[++i], CV_LOAD_IMAGE_GRAYSCALE);
+            img1.upload(imread(argv[++i], CV_LOAD_IMAGE_GRAYSCALE));
             CV_Assert(!img1.empty());
         }
         else if (string(argv[i]) == "--right")
         {
-            img2 = imread(argv[++i], CV_LOAD_IMAGE_GRAYSCALE);
+            img2.upload(imread(argv[++i], CV_LOAD_IMAGE_GRAYSCALE));
             CV_Assert(!img2.empty());
         }
         else if (string(argv[i]) == "--help")