启用docking

core/application/application.cpp

@@ -117,6 +117,8 @@ void application::init_imgui() {
     ImGuiIO& io = ImGui::GetIO();
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
+    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable; // Enable Docking
+    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable; // Enable Multi-Viewport / Platform Windows
     ImGui::StyleColorsDark();
     //ImGui::StyleColorsLight();
 }

core/rhi/opengl/renderer_opengl.cpp

@@ -88,6 +88,8 @@ void renderer_opengl::new_frame(GLFWwindow* window_handle) {
 }
 
 void renderer_opengl::end_frame(GLFWwindow* window_handle) {
+    const ImGuiIO& io = ImGui::GetIO();
+
     // Rendering
     ImGui::Render();
     int display_w, display_h;
@@ -98,6 +100,17 @@ void renderer_opengl::end_frame(GLFWwindow* window_handle) {
     glClear(GL_COLOR_BUFFER_BIT);
     ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
 
+    // Update and Render additional Platform Windows
+    // (Platform functions may change the current OpenGL context, so we save/restore it to make it easier to paste this code elsewhere.
+    //  For this specific demo app we could also call glfwMakeContextCurrent(window) directly)
+    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+    {
+        GLFWwindow* backup_current_context = glfwGetCurrentContext();
+        ImGui::UpdatePlatformWindows();
+        ImGui::RenderPlatformWindowsDefault();
+        glfwMakeContextCurrent(backup_current_context);
+    }
+
     glfwSwapBuffers(window_handle);
 }