Only post here if you can't Build/Link/Run or can't Load Font Files (OTHER TOPICS WILL BE DELETED)

[ocornut]

This category is for people Getting Started with Dear ImGui.

Please post in this forum if you are Getting Started and:

• You cannot Build or Link Dear ImGui examples.
• You cannot Build or Link or Run Dear ImGui in your application or custom engine.
• You are failing to load a font (please read FONTS.md and in particular the "About Filenames" section).

== if Dear ImGui is not showing in your app.
If Dear ImGui is successfully showing in your app, please search for Issues or open an Issue.

If you an existing user of Dear ImGui and an update/commit broke build or runtime for you please open an Issue, not a Discussion post.

References:

• Wiki
• FAQ
• About Backends
• About Examples App
• About Fonts

[IssaAboudi]

Hi,

I am unsure of how to build or link ImGUI.

I imported a bunch of the files that seemed relevant (everything in root, and then under opengl3 in backend). Got undefined references and edited my cmakelists file to include the cpp files but the undefined references just kept growing.

[PathogenDavid]

You should post your own thread and include your CMakeLists.txt and the errors you're getting. If you're getting a lot of them consider sharing them as a GitHub Gist.

[flower78]

Hi,
I am using the glfw3 + opengl3_loader setup and I was wondering:
Usually I do my stuff with glad, but I decided I want to integrate ImGui this time:

"GL_STATIC_DRAW" cannot be resolved, I looked it up the loader file has no definition macro unlike glad.h would have.
It is no biggie, I just looked the "resolvent" up in some glad.h I used before,:

But it doesn't feel right you know.
Obviously the exe won't run properly with not well.defined buffer data.
Is this intended? Should I use another loader for my "3d-graphics-only-stuff"?
Kind regardss

[ocornut]

If this is your own code, integrating dear imgui and our backends shouldn't affect it.
Feel free to keep using GLAD in your own code, why dropping it?

[flower78]

All good! Thank you!
🙏
I guess the loader is for ImGui-functionality and its respective kind of draw calls only. I was just afraid glad could cause some issues as opposed to the opengl3_loader, since you specifically designed it for it. After experience, I hate mixing stuff unnecessarily..

[Jaweki]

![vulkan_include_error](https://user-images.githubusercontent.com/97351534/233704000-a2023241-2b7e-485b-80bc-005984c73aee.png

am getting started with imgui_docking. and i seem to have no "vulkan/vulkan.h" file.
i have done git clone, then opened imgui_examples.sln, main.cpp of example_glfw_vulkan
Kindly assist.

[ocornut]

You need to install VulkanSDK https://www.lunarg.com/vulkan-sdk/
If you are not familiar with Vulkan best to use OpenGL or DX11 tho.

[marko-kisegi]

I've downloaded the github repo in VS and built the projects updated whatever / the examples do not work due the SDL.h not being found; so anything besides DX9 doesnt work.

[ocornut]

You need to either install SDL2 via vcpkg with vs integration, or install it yourself and set SDL2_DIR environment variable.

[marko-kisegi]

You need to either install SDL2 via vcpkg with vs integration, or install it yourself and set SDL2_DIR environment variable.

thanks; however i cba wasting more time setting up a project ill be doing "for fun" so ima just wait till someone makes a proper yt video

[sirlis]

Using OpenGL3 GLFW and Glad with ImGui latest docking version.
I want to separate the window into two aera, left one for information, right one for opengl 3d scene.
Just followed the guide to include all three headers.

Compiling with DockBuilderXXX is not a member of ImGui error.

If I delete the docking related codes the program can compile and run, with two individual imgui windows floating above the opengl background. Although I don't know how to move the opengl rendering background into one of the two imgui windows.

---

The main code is as follows:

    while (!glfwWindowShouldClose(MainWindow))
    {
        glfwPollEvents();
        glClearColor(0.0, 0.0, 0.0, 1.0);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        // Start the Dear ImGui frame
        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();
        // ImGui::ShowDemoWindow(); // Show demo window! :)

        const auto &viewport = ImGui::GetMainViewport();
        ImGui::SetNextWindowPos(viewport->Pos);
        ImGui::SetNextWindowSize(viewport->Size);
        ImGui::SetNextWindowViewport(viewport->ID);
        ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
        ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);

        static ImGuiDockNodeFlags dockspace_flags = ImGuiDockNodeFlags_PassthruCentralNode;
        ImGuiWindowFlags window_flags = ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking;
        window_flags |= ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove;
        window_flags |= ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus;
        if (dockspace_flags & ImGuiDockNodeFlags_PassthruCentralNode)
            window_flags |= ImGuiWindowFlags_NoBackground;

        ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
        ImGui::Begin("DockSpace", nullptr, window_flags);
        ImGui::PopStyleVar();
        ImGui::PopStyleVar(2);

        // DockSpace
        ImGuiIO &io = ImGui::GetIO();
        if (io.ConfigFlags & ImGuiConfigFlags_DockingEnable)
        {

            auto dockspaceId = ImGui::DockSpaceOverViewport(viewport);
            ImGui::DockSpace(dockspaceId, ImVec2{0.0f, 0.0f}, ImGuiDockNodeFlags_PassthruCentralNode);
            static bool init = true;
            if (init)
            {
                ImGui::DockBuilderRemoveNode(dockspaceId); // error
                ImGui::DockBuilderAddNode(dockspaceId, dockspace_flags | ImGuiDockNodeFlags_DockSpace); // error
                ImGui::DockBuilderSetNodeSize(dockspaceId, viewport->Size); // error
                auto dock_id_left = ImGui::DockBuilderSplitNode(dockspaceId, ImGuiDir_Left, 0.2f, nullptr, &dockspaceId); // error
                auto dock_id_right = ImGui::DockBuilderSplitNode(dockspaceId, ImGuiDir_Right, 0.8f, nullptr, &dockspaceId); // error
                ImGui::DockBuilderDockWindow("Right", dock_id_right); // error
                ImGui::DockBuilderDockWindow("Left", dock_id_left); // error
                ImGui::DockBuilderFinish(dockspaceId); // error
                init = false;
            }
        }
        ImGui::End();

        ImGui::Begin("Left");
        ImGui::Text("Text 1");
        ImGui::End();
        ImGui::Begin("Right");
        ImGui::Text("Text 2");
        renderOpenGLContent(SunShader, EarthShader, VehicleShader, CelebodyShader,
                            SkyboxShader, Sun, Earth, Moon, Spacecraft,
                            skybox, texture_sun, texture_earth, texture_earth_night,
                            texture_earth_cloud, texture_earth_watermask,
                            texture_earth_normal, texture_moon);
        ImGui::End();

        ImGui::Render();
        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());

        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
        {
            GLFWwindow *backup_current_context = glfwGetCurrentContext();
            ImGui::UpdatePlatformWindows();
            ImGui::RenderPlatformWindowsDefault();
            glfwMakeContextCurrent(backup_current_context);
        }

        glfwSwapBuffers(MainWindow);
    }

---

detailed errors are like:

[build] D:\Works\github\digital-spacecraft\src\scene\ShowWindow.cpp: In function 'int RenderMainWindow()':
[build] D:\Works\github\digital-spacecraft\src\scene\ShowWindow.cpp:787:24: error: 'DockBuilderRemoveNode' is not a member of 'ImGui'
[build]   787 |                 ImGui::DockBuilderRemoveNode(dockspaceId); // clear any previous layout
[build]       |                        ^~~~~~~~~~~~~~~~~~~~~
[build] D:\Works\github\digital-spacecraft\src\scene\ShowWindow.cpp:788:24: error: 'DockBuilderAddNode' is not a member of 'ImGui'
[build]   788 |                 ImGui::DockBuilderAddNode(dockspaceId, dockspace_flags | ImGuiDockNodeFlags_DockSpace);
[build]       |                        ^~~~~~~~~~~~~~~~~~
[build] D:\Works\github\digital-spacecraft\src\scene\ShowWindow.cpp:788:74: error: 'ImGuiDockNodeFlags_DockSpace' was not declared in this scope; did you mean 'ImGuiDockNodeFlags_NoSplit'?
[build]   788 |                 ImGui::DockBuilderAddNode(dockspaceId, dockspace_flags | ImGuiDockNodeFlags_DockSpace);
[build]       |                                                                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
[build]       |                                                                          ImGuiDockNodeFlags_NoSplit
[build] D:\Works\github\digital-spacecraft\src\scene\ShowWindow.cpp:789:24: error: 'DockBuilderSetNodeSize' is not a member of 'ImGui'
[build]   789 |                 ImGui::DockBuilderSetNodeSize(dockspaceId, viewport->Size);
[build]       |                        ^~~~~~~~~~~~~~~~~~~~~~
[build] D:\Works\github\digital-spacecraft\src\scene\ShowWindow.cpp:794:44: error: 'DockBuilderSplitNode' is not a member of 'ImGui'
[build]   794 |                 auto dock_id_left = ImGui::DockBuilderSplitNode(dockspaceId, ImGuiDir_Left, 0.2f, nullptr, &dockspaceId);
[build]       |                                            ^~~~~~~~~~~~~~~~~~~~
[build] D:\Works\github\digital-spacecraft\src\scene\ShowWindow.cpp:795:45: error: 'DockBuilderSplitNode' is not a member of 'ImGui'
[build]   795 |                 auto dock_id_right = ImGui::DockBuilderSplitNode(dockspaceId, ImGuiDir_Right, 0.8f, nullptr, &dockspaceId);
[build]       |                                             ^~~~~~~~~~~~~~~~~~~~
[build] D:\Works\github\digital-spacecraft\src\scene\ShowWindow.cpp:798:24: error: 'DockBuilderDockWindow' is not a member of 'ImGui'
[build]   798 |                 ImGui::DockBuilderDockWindow("Right", dock_id_right);
[build]       |                        ^~~~~~~~~~~~~~~~~~~~~
[build] D:\Works\github\digital-spacecraft\src\scene\ShowWindow.cpp:799:24: error: 'DockBuilderDockWindow' is not a member of 'ImGui'
[build]   799 |                 ImGui::DockBuilderDockWindow("Left", dock_id_left);
[build]       |                        ^~~~~~~~~~~~~~~~~~~~~
[build] D:\Works\github\digital-spacecraft\src\scene\ShowWindow.cpp:800:24: error: 'DockBuilderFinish' is not a member of 'ImGui'
[build]   800 |                 ImGui::DockBuilderFinish(dockspaceId);
[build]       |                        ^~~~~~~~~~~~~~~~~
[build] mingw32-make.exe[2]: *** [src\scene\CMakeFiles\DSScene.dir\build.make:241: src/scene/CMakeFiles/DSScene.dir/ShowWindow.cpp.obj] Error 1
[build] mingw32-make.exe[1]: *** [CMakeFiles\Makefile2:897: src/scene/CMakeFiles/DSScene.dir/all] Error 2
[build] mingw32-make.exe: *** [Makefile:165: all] Error 2

[emoon]

Have you included imgui/imgui_internal.h ?

[sirlis]

Thank you ! I explicitly include the imgui/imgui_internal.h and the problem goes. But the user guide does not mention about this.
However, another error when running the program appear

Assertion failed: node->IsDockSpace() == false && "Cannot call DockSpace() twice a frame with the same ID", file ...\imgui\imgui.cpp, line 17877

[sirlis]

I managed to solve the problem.

            // auto dockspaceId = ImGui::DockSpaceOverViewport(viewport);
            ImGuiID dockspaceId = ImGui::GetID("DockSpace");

There appear two windows above the rendered scene now. Then how to render the scene in the right imgui window?