text: //-----------------------------------------------------------------------------
  // USER IMPLEMENTATION
  // This file contains compile-time options for ImGui.
  // Other options (memory allocation overrides, callbacks, etc.) can be set at runtime via the ImGuiIO structure - ImGui::GetIO().
  //-----------------------------------------------------------------------------
  
  #pragma once
  
  #include "ospcommon/math/vec.h"
  
  //---- Define assertion handler. Defaults to calling assert().
  //#define IM_ASSERT(_EXPR)  MyAssert(_EXPR)
  
  //---- Define attributes of all API symbols declarations, e.g. for DLL under Windows.
  #ifdef _WIN32
  #  ifdef ospray_imgui_EXPORTS
  #    define IMGUI_API __declspec(dllexport)
  #  else
  #    define IMGUI_API __declspec(dllimport)
  #  endif
  #else
  #  define IMGUI_API
  #endif
  
  //---- Don't define obsolete functions names. Consider enabling from time to time or when updating to reduce like hood of using already obsolete function/names
  //#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS
  
  //---- Include imgui_user.h at the end of imgui.h
  //#define IMGUI_INCLUDE_IMGUI_USER_H
  
  //---- Don't implement default handlers for Windows (so as not to link with OpenClipboard() and others Win32 functions)
  //#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS
  //#define IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS
  
  //---- Don't implement test window functionality (ShowTestWindow()/ShowStyleEditor()/ShowUserGuide() methods will be empty)
  //---- It is very strongly recommended to NOT disable the test windows. Please read the comment at the top of imgui_demo.cpp to learn why.
  //#define IMGUI_DISABLE_TEST_WINDOWS
  
  //---- Don't implement ImFormatString(), ImFormatStringV() so you can reimplement them yourself.
  //#define IMGUI_DISABLE_FORMAT_STRING_FUNCTIONS
  
  //---- Pack colors to BGRA instead of RGBA (remove need to post process vertex buffer in back ends)
  //#define IMGUI_USE_BGRA_PACKED_COLOR
  
  //---- Implement STB libraries in a namespace to avoid linkage conflicts
  //#define IMGUI_STB_NAMESPACE     ImGuiStb
  
  //---- Define constructor and implicit cast operators to convert back<>forth from your math types and ImVec2/ImVec4.
  #define IM_VEC2_CLASS_EXTRA                                                 \
          ImVec2(const ospcommon::math::vec2f& f) { x = f.x; y = f.y; }                       \
          operator ospcommon::math::vec2f() const { return ospcommon::math::vec2f(x,y); }
  
  #define IM_VEC4_CLASS_EXTRA                                                 \
          ImVec4(const ospcommon::math::vec4f& f) { x = f.x; y = f.y; z = f.z; w = f.w; }     \
          operator ospcommon::math::vec4f() const { return ospcommon::math::vec4f(x,y,z,w); }
  
  //---- Use 32-bit vertex indices (instead of default: 16-bit) to allow meshes with more than 64K vertices
  //#define ImDrawIdx unsigned int
  
  //---- Tip: You can add extra functions within the ImGui:: namespace, here or in your own headers files.
  //---- e.g. create variants of the ImGui::Value() helper for your low-level math types, or your own widgets/helpers.
  /*
  namespace ImGui
  {
      void    Value(const char* prefix, const MyMatrix44& v, const char* float_format = NULL);
  }
  */
  
  