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Dear ImGui

Dear ImGui C++ Integration#

UNIGINE integration with the Dear ImGui library v. 1.81 WIP (https://github.com/ocornut/imgui).

Integrating Into Your Project#

Integrating the Dear ImGui C++ sample into your project requires you to perform the following steps.

  1. Copy the following files from the sample project to your project:

    • The imgui folder — to the source/ folder
    • The ImGuiImpl.cpp and ImGuiImpl.h files — to the source/ folder
    • The data/imgui.basemat file — to the data/ folder
  2. In Visual Studio, add all files copied to the source/ folder to your project (Project -> Add Existing Item...).
  3. To display the sample menu in your application, add the following lines in the corresponding sections of source/AppSystemLogic.cpp:

    Source code (C++)
    #include <UnigineWorld.h>
    #include <UnigineControls.h>
    #include <UnigineInput.h>
    
    #include "ImGuiImpl.h"
    
    using namespace Unigine;
    
        
    int AppSystemLogic::init()
    {
    	Unigine::Engine::get()->setBackgroundUpdate(Engine::BACKGROUND_UPDATE_RENDER_NON_MINIMIZED);
    
    	// initialize ImGui backend, set up the Engine
    	ImGuiImpl::init();
    
    	return 1;
    }
    
    int AppSystemLogic::update()
    {
    	EngineWindowPtr main_window = WindowManager::getMainWindow();
    	if (!main_window)
    	{
    		Engine::get()->quit();
    		return 1;
    	}
    
    	ImGuiImpl::newFrame();
    
    	// feel free to use ImGui API here...
    	ImGui::ShowDemoWindow();
    
    	ImGuiImpl::render();
    	return 1;
    }
    
    int AppSystemLogic::shutdown()
    {
    	ImGuiImpl::shutdown();
    
    	return 1;
    }
Notice

The sample uses ImGui version 1.81.0 WIP with a customized imconfig.h file. If you want to use another version, replace the following commented line in the imconfig.h file that you use:

Source code
//#define ImDrawIdx unsigned int

with this:

Source code
#define ImDrawIdx int

Otherwise, you'll get a compilation error.

Building the Project#

When creating a release build, add the absolute and the relative path for imgui.basemat as shown below:

Dear ImGui C# Integration#

UNIGINE integration with the Dear ImGui library v. 1.86 (https://github.com/ocornut/imgui). Implemented on the basis of the ImGui.NET wrapper (https://github.com/mellinoe/ImGui.NET).

Integrating Into Your Project#

Integrating the Dear ImGui C# sample into your project requires you to perform the following steps.

  1. Add ImGui libraries using either of the following variants:

    • Manually: copy the cimgui.dll and ImGui.NET.dll files from the sample folder to the bin/ folder of your project.
    • In Visual Studio Code, open the terminal and type dotnet add package ImGui.NET -v 1.86.0.
    • In Visual Studio, select Tools -> NuGet Package Manager -> Manage NuGet Packages for Solution..., find ImGui.NET wrapper and install it (the sample uses version 1.86.0).

      Installing ImGui.NET wrapper in Visual Studio

  2. Copy the data/imgui.basemat file to the data/ folder of your project.
  3. Copy the ImGuiImpl.cs file to the source/ folder of your project.
  4. Add ImGuiImpl.cs to <Project_Name>.csproj in the root directory of the project:

    Source code
    <Compile Include="source\ImGuiImpl.cs" />
  5. Add the ImGui.NET.dll library to the Reference in <Project_Name>.csproj and make sure to specify the HintPath:

    Source code
    <ItemGroup>
        <Reference Include="ImGui.NET">
            <HintPath>bin\ImGui.NET.dll</HintPath>
        </Reference>
    </ItemGroup>
  6. In <Project_Name>.csproj, add the possibility to work with Unsafe blocks:

    Source code
    <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
  7. In source/AppSystemLogic.cs, add the directive and the following code in the corresponding methods.

    Source code (C#)
    using ImGuiNET;
    
        
        public override bool Init()
    		{
    			ImGuiImpl.Init();
    			return true;
    		}
    
    		public override bool Update()
    		{
    			ImGuiImpl.NewFrame();
    
    			// feel free to use ImGui API here...
    			ImGui.ShowDemoWindow();
    
    			ImGuiImpl.Render();
    
    			return true;
    		}
    		public override bool Shutdown()
    		{
    			ImGuiImpl.Shutdown();
    			return true;
    		}
Notice

The sample uses ImGui version 1.86.0 with a customized imconfig.h file. If you want to use another version, replace the following commented line in the imconfig.h file that you use:

Source code
//#define ImDrawIdx unsigned int

with this:

Source code
#define ImDrawIdx int

Otherwise, you'll get a compilation error.

Building the Project#

When creating a build, add the absolute and the relative path for cimgui.dll and imgui.basemat as shown below:

Last update: 19.12.2023
Build: ()