message: make sure handles are initialized properly (avoid API calls before init)
diff: @@ -46,10 +46,10 @@ class BaseFixture : public ::benchmark::Fixture
  std::string rendererType;
  std::string scene;
  - cpp::FrameBuffer framebuffer;
  - cpp::Renderer renderer;
  - cpp::Camera camera;
  - cpp::World world;
  + cpp::FrameBuffer framebuffer{nullptr};
  + cpp::Renderer renderer{nullptr};
  + cpp::Camera camera{nullptr};
  + cpp::World world{nullptr};
  };
  #define OSPRAY_DEFINE_BENCHMARK(FixtureName) \
  