Moved OpenGL sample to opengl folder

samples/cpp/CMakeLists.txt

@@ -27,9 +27,6 @@ endif()
 project(cpp_samples)
 ocv_include_modules_recurse(${OPENCV_CPP_SAMPLES_REQUIRED_DEPS})
 file(GLOB_RECURSE cpp_samples RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.cpp)
-if(NOT HAVE_OPENGL)
-  ocv_list_filterout(cpp_samples Qt_sample)
-endif()
 if(NOT HAVE_opencv_cudaarithm OR NOT HAVE_opencv_cudafilters)
   ocv_list_filterout(cpp_samples "/gpu/")
 endif()

samples/gpu/CMakeLists.txt

@@ -50,9 +50,6 @@ if((CV_GCC OR CV_CLANG) AND NOT ENABLE_NOISY_WARNINGS)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unused-function")
 endif()
 file(GLOB all_samples RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.cpp)
-if(NOT HAVE_OPENGL)
-  ocv_list_filterout(all_samples "opengl")
-endif()
 foreach(sample_filename ${all_samples})
   ocv_define_sample(tgt ${sample_filename} gpu)
   ocv_target_link_libraries(${tgt} ${OPENCV_LINKER_LIBS} ${OPENCV_CUDA_SAMPLES_REQUIRED_DEPS})

samples/opengl/CMakeLists.txt

@@ -1,15 +1,9 @@
 if(APPLE)
-    return()
+  return()
 endif()
 
 if(UNIX)
   find_package(X11 QUIET)
-  if(NOT X11_FOUND)
-    message(STATUS "OpenGL samples require development files for libX11")
-    return()
-  endif()
-  include_directories(${X11_INCLUDE_DIR})
-  set(SAMPLE_LINKER_DEPS "${X11_LIBRARIES}")
 endif()
 
 SET(OPENCV_OPENGL_SAMPLES_REQUIRED_DEPS
@@ -24,10 +18,16 @@ if(BUILD_EXAMPLES AND OCV_DEPENDENCIES_FOUND)
   project(opengl_samples)
   ocv_include_modules_recurse(${OPENCV_OPENGL_SAMPLES_REQUIRED_DEPS})
   file(GLOB all_samples RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.cpp)
+  if(NOT X11_FOUND)
+    ocv_list_filterout(all_samples "opengl_interop")
+  endif()
   foreach(sample_filename ${all_samples})
     ocv_define_sample(tgt ${sample_filename} opengl)
-    ocv_target_link_libraries(${tgt}
-      ${OPENCV_LINKER_LIBS} ${OPENCV_OPENGL_SAMPLES_REQUIRED_DEPS} ${SAMPLE_LINKER_DEPS})
+    ocv_target_link_libraries(${tgt} ${OPENCV_LINKER_LIBS} ${OPENCV_OPENGL_SAMPLES_REQUIRED_DEPS})
+    if(sample_filename STREQUAL "opengl_interop.cpp")
+      ocv_target_link_libraries(${tgt} ${X11_LIBRARIES})
+      ocv_target_include_directories(${tgt} ${X11_INCLUDE_DIR})
+    endif()
   endforeach()
 endif()