Examples

// At initialization:
call ImGui::CreateContext()
call ImGui_ImplXXXX_Init() for each backend.

// At the beginning of your frame:
call ImGui_ImplXXXX_NewFrame() for each backend.
call ImGui::NewFrame()

// At the end of your frame:
call ImGui::Render()
call ImGui_ImplXXXX_RenderDrawData() for your Renderer backend.

// At shutdown:
call ImGui_ImplXXXX_Shutdown() for each backend.
call ImGui::DestroyContext()

// In your render loop
ImGui::ShowDemoWindow();

int main(int, char**)
{
    // Setup window and graphics context
    // ...
    
    // Setup Dear ImGui context
    IMGUI_CHECKVERSION();
    ImGui::CreateContext();
    ImGuiIO& io = ImGui::GetIO();
    
    // Setup Dear ImGui style
    ImGui::StyleColorsDark();
    
    // Setup Platform/Renderer backends
    ImGui_ImplGlfw_InitForOpenGL(window, true);
    ImGui_ImplOpenGL3_Init(glsl_version);
    
    // Main loop
    while (!glfwWindowShouldClose(window))
    {
        // Poll and handle events
        glfwPollEvents();
        
        // Start the Dear ImGui frame
        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();
        
        // Your UI code here
        ImGui::ShowDemoWindow();
        
        // Rendering
        ImGui::Render();
        int display_w, display_h;
        glfwGetFramebufferSize(window, &display_w, &display_h);
        glViewport(0, 0, display_w, display_h);
        glClear(GL_COLOR_BUFFER_BIT);
        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
        
        glfwSwapBuffers(window);
    }
    
    // Cleanup
    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplGlfw_Shutdown();
    ImGui::DestroyContext();
    
    return 0;
}