message: Fixed OpenGL-specific compilation warning (unused function)
diff: @@ -57,51 +57,40 @@ using namespace cv::cuda;
  namespace
  {
  #ifndef HAVE_OPENGL
  - inline void throw_no_ogl() { CV_Error(cv::Error::OpenGlNotSupported, "The library is compiled without OpenGL support"); }
  - #else
  - inline void throw_no_ogl() { CV_Error(cv::Error::OpenGlApiCallError, "OpenGL context doesn't exist"); }
  -
  - bool checkError(const char* file, const int line, const char* func = 0)
  +inline static void throw_no_ogl() { CV_Error(cv::Error::OpenGlNotSupported, "The library is compiled without OpenGL support"); }
  +#elif defined _DEBUG
  +inline static bool checkError(const char* file, const int line, const char* func = 0)
  {
  GLenum err = gl::GetError();
  -
  if (err != gl::NO_ERROR_)
  {
  const char* msg;
  -
  switch (err)
  {
  case gl::INVALID_ENUM:
  msg = "An unacceptable value is specified for an enumerated argument";
  break;
  -
  case gl::INVALID_VALUE:
  msg = "A numeric argument is out of range";
  break;
  -
  case gl::INVALID_OPERATION:
  msg = "The specified operation is not allowed in the current state";
  break;
  -
  case gl::OUT_OF_MEMORY:
  msg = "There is not enough memory left to execute the command";
  break;
  -
  default:
  msg = "Unknown error";
  };
  -
  cvError(CV_OpenGlApiCallError, func, msg, file, line);
  -
  return false;
  }
  -
  return true;
  }
  - #endif
  +#endif // HAVE_OPENGL
  +} // namespace
  #define CV_CheckGlError() CV_DbgAssert( (checkError(__FILE__, __LINE__, CV_Func)) )
  -} // namespace
  #ifdef HAVE_OPENGL
  namespace
  