Imgui: How to insert a background image in the window that is created by glfw.

[leongong1996]

I'm a Beginner of ImGui, and I don't know how to insert a background image to the window.Have ImGui provided the related methods?or is it need programming about openGL.

[ice1000]

ImGui::Image is what you need.

To learn about ImTextureID, read the header files of each renderer header file (like imgui_impl_opengl3.h).
You'll have to write a little code related to OpenGL.

[ice1000]

ImGui::Image can do this

[leongong1996]

I know how to add pictures to an image widget, but I want to add background to the window that GLFW creates, which is the largest window.

[ice1000]

You can create a window that fits the glfw's window with

auto MAIN_WINDOW = ImGuiWindowFlags_NoMove |
        ImGuiWindowFlags_NoTitleBar |
        ImGuiWindowFlags_NoBringToFrontOnFocus |
        ImGuiWindowFlags_NoInputs |
        ImGuiWindowFlags_NoCollapse |
         ImGuiWindowFlags_NoResize;

int w, h;
glfwGetWindowSize(window, &w, &h);
ImVec2 size(w, h);
ImGui::SetNextWindowPos(ImVec2());
ImGui::SetNextWindowSize(size);
if (ImGui::Begin(title, nullptr, MAIN_WINDOW)) {
  ImGui::Image(your texture, size);
  ImGui::End();
}

And you can still create other windows.

[leongong1996]

I think it's a useful method.But there is another problem.If create a window that fits the glfw's window, there are paddings in the window.And if I set no paddings, other window will be influent.

[ice1000]

Push Style, draw the background window and pop.

[leongong1996]

Thank you, I have solved the problem.

[leongong1996]

其实我也是成都的哟

[ice1000]

幸会幸会