Wait for backprojection copy commands

src/ufo-anka-backproject-task.c

@@ -284,6 +284,7 @@ copy_to_image (UfoBuffer *input,
 {
     const UfoBufferLocation location = ufo_buffer_get_location (input);
     cl_mem input_data;
+    cl_event event;
     gfloat *input_data_host;
     size_t src_offset;
 
@@ -301,7 +302,7 @@ copy_to_image (UfoBuffer *input,
                                                             input_data_host + src_offset,
                                                             0,
                                                             NULL,
-                                                            NULL));
+                                                            &event));
             break;
         case UFO_BUFFER_LOCATION_DEVICE:
             input_data = ufo_buffer_get_device_array (input, cmd_queue);
@@ -314,7 +315,7 @@ copy_to_image (UfoBuffer *input,
                                                                    region,
                                                                    0,
                                                                    NULL,
-                                                                   NULL));
+                                                                   &event));
             break;
         case UFO_BUFFER_LOCATION_DEVICE_IMAGE:
             input_data = ufo_buffer_get_device_image (input, cmd_queue);
@@ -326,12 +327,14 @@ copy_to_image (UfoBuffer *input,
                                                            region,
                                                            0,
                                                            NULL,
-                                                           NULL));
+                                                           &event));
             break;
         default:
             g_warning ("Invalid input buffer location");
             break;
     }
+    UFO_RESOURCES_CHECK_CLERR (clWaitForEvents (1, &event));
+    UFO_RESOURCES_CHECK_CLERR (clReleaseEvent (event));
 }