DearImgui.h

#pragma once
 
#ifdef BUILDSYSTEM_ENABLE_IMGUI_SUPPORT
 
#  include <Core/ResourceManager/ResourceHandle.h>
#  include <Foundation/Configuration/Singleton.h>
#  include <Foundation/Math/Size.h>
#  include <Foundation/Memory/CommonAllocators.h>
#  include <Foundation/Types/UniquePtr.h>
#  include <GameEngine/GameEngineDLL.h>
#  include <RendererCore/Pipeline/Declarations.h>
 
#  include <Imgui/imgui.h>
 
using plTexture2DResourceHandle = plTypedResourceHandle<class plTexture2DResource>;
 
struct ImGuiContext;
 
using plImguiConfigFontCallback = plDelegate<void(ImFontAtlas&)>;
using plImguiConfigStyleCallback = plDelegate<void(ImGuiStyle&)>;
 
class PL_GAMEENGINE_DLL plImgui
{
  PL_DECLARE_SINGLETON(plImgui);
 
public:
  plImgui(plImguiConfigFontCallback configFontCallback = plImguiConfigFontCallback(),
    plImguiConfigStyleCallback configStyleCallback = plImguiConfigStyleCallback());
  ~plImgui();
 
  void SetCurrentContextForView(const plViewHandle& hView);
 
  plSizeU32 GetCurrentWindowResolution() const { return m_CurrentWindowResolution; }
 
  void SetPassInputToImgui(bool bPassInput) { m_bPassInputToImgui = bPassInput; }
 
  bool WantsInput() const { return m_bImguiWantsInput; }
 
  ImFontAtlas& GetFontAtlas() { return *m_pSharedFontAtlas; }
 
  void SetStyle();
 
private:
  friend class plImguiExtractor;
  friend class plImguiRenderer;
 
  void Startup(plImguiConfigFontCallback configFontCallback);
  void Shutdown();
 
  ImGuiContext* CreateContext();
  void BeginFrame(const plViewHandle& hView);
 
  plProxyAllocator m_Allocator;
 
  bool m_bPassInputToImgui = true;
  bool m_bImguiWantsInput = false;
  plSizeU32 m_CurrentWindowResolution;
  plHybridArray<plTexture2DResourceHandle, 4> m_Textures;
 
  plImguiConfigStyleCallback m_ConfigStyleCallback;
 
  plUniquePtr<ImFontAtlas> m_pSharedFontAtlas;
 
  struct Context
  {
    ImGuiContext* m_pImGuiContext = nullptr;
    plUInt64 m_uiFrameBeginCounter = -1;
    plUInt64 m_uiFrameRenderCounter = -1;
  };
 
  plMutex m_ViewToContextTableMutex;
  plHashTable<plViewHandle, Context> m_ViewToContextTable;
};
 
#endif