Use imgui

application/remote_desk/remote_desk_gui/main.cpp

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+// Dear ImGui: standalone example application for SDL2 + SDL_Renderer
+// (SDL is a cross-platform general purpose library for handling windows,
+// inputs, OpenGL/Vulkan/Metal graphics context creation, etc.)
+
+// Learn about Dear ImGui:
+// - FAQ                  https://dearimgui.com/faq
+// - Getting Started      https://dearimgui.com/getting-started
+// - Documentation        https://dearimgui.com/docs (same as your local docs/
+// folder).
+// - Introduction, links and more at the top of imgui.cpp
+
+// Important to understand: SDL_Renderer is an _optional_ component of SDL2.
+// For a multi-platform app consider using e.g. SDL+DirectX on Windows and
+// SDL+OpenGL on Linux/OSX.
+
+#include <SDL.h>
+#include <stdio.h>
+
+#include "imgui.h"
+#include "imgui_impl_sdl2.h"
+#include "imgui_impl_sdlrenderer2.h"
+
+#if !SDL_VERSION_ATLEAST(2, 0, 17)
+#error This backend requires SDL 2.0.17+ because of SDL_RenderGeometry() function
+#endif
+
+// Main code
+int main(int, char**) {
+  // Setup SDL
+  if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) !=
+      0) {
+    printf("Error: %s\n", SDL_GetError());
+    return -1;
+  }
+
+  // From 2.0.18: Enable native IME.
+#ifdef SDL_HINT_IME_SHOW_UI
+  SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
+#endif
+
+  // Create window with SDL_Renderer graphics context
+  SDL_WindowFlags window_flags =
+      (SDL_WindowFlags)(SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
+  SDL_Window* window = SDL_CreateWindow(
+      "Dear ImGui SDL2+SDL_Renderer example", SDL_WINDOWPOS_CENTERED,
+      SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
+  SDL_Renderer* renderer = SDL_CreateRenderer(
+      window, -1, SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED);
+  if (renderer == nullptr) {
+    SDL_Log("Error creating SDL_Renderer!");
+    return 0;
+  }
+  // SDL_RendererInfo info;
+  // SDL_GetRendererInfo(renderer, &info);
+  // SDL_Log("Current SDL_Renderer: %s", info.name);
+
+  // Setup Dear ImGui context
+  IMGUI_CHECKVERSION();
+  ImGui::CreateContext();
+  ImGuiIO& io = ImGui::GetIO();
+  (void)io;
+  io.ConfigFlags |=
+      ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
+  io.ConfigFlags |=
+      ImGuiConfigFlags_NavEnableGamepad;  // Enable Gamepad Controls
+
+  // Setup Dear ImGui style
+  ImGui::StyleColorsDark();
+  // ImGui::StyleColorsLight();
+
+  // Setup Platform/Renderer backends
+  ImGui_ImplSDL2_InitForSDLRenderer(window, renderer);
+  ImGui_ImplSDLRenderer2_Init(renderer);
+
+  // Load Fonts
+  // - If no fonts are loaded, dear imgui will use the default font. You can
+  // also load multiple fonts and use ImGui::PushFont()/PopFont() to select
+  // them.
+  // - AddFontFromFileTTF() will return the ImFont* so you can store it if you
+  // need to select the font among multiple.
+  // - If the file cannot be loaded, the function will return a nullptr. Please
+  // handle those errors in your application (e.g. use an assertion, or display
+  // an error and quit).
+  // - The fonts will be rasterized at a given size (w/ oversampling) and stored
+  // into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which
+  // ImGui_ImplXXXX_NewFrame below will call.
+  // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype
+  // for higher quality font rendering.
+  // - Read 'docs/FONTS.md' for more instructions and details.
+  // - Remember that in C/C++ if you want to include a backslash \ in a string
+  // literal you need to write a double backslash \\ !
+  // io.Fonts->AddFontDefault();
+  // io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf", 18.0f);
+  // io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
+  // io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
+  // io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
+  // ImFont* font =
+  // io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f,
+  // nullptr, io.Fonts->GetGlyphRangesJapanese()); IM_ASSERT(font != nullptr);
+
+  // Our state
+  bool show_demo_window = true;
+  bool show_another_window = false;
+  ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
+
+  // Main loop
+  bool done = false;
+  while (!done) {
+    // Poll and handle events (inputs, window resize, etc.)
+    // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to
+    // tell if dear imgui wants to use your inputs.
+    // - When io.WantCaptureMouse is true, do not dispatch mouse input data to
+    // your main application, or clear/overwrite your copy of the mouse data.
+    // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input
+    // data to your main application, or clear/overwrite your copy of the
+    // keyboard data. Generally you may always pass all inputs to dear imgui,
+    // and hide them from your application based on those two flags.
+    SDL_Event event;
+    while (SDL_PollEvent(&event)) {
+      ImGui_ImplSDL2_ProcessEvent(&event);
+      if (event.type == SDL_QUIT) done = true;
+      if (event.type == SDL_WINDOWEVENT &&
+          event.window.event == SDL_WINDOWEVENT_CLOSE &&
+          event.window.windowID == SDL_GetWindowID(window))
+        done = true;
+    }
+
+    // Start the Dear ImGui frame
+    ImGui_ImplSDLRenderer2_NewFrame();
+    ImGui_ImplSDL2_NewFrame();
+    ImGui::NewFrame();
+
+    // 1. Show the big demo window (Most of the sample code is in
+    // ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear
+    // ImGui!).
+    if (show_demo_window) ImGui::ShowDemoWindow(&show_demo_window);
+
+    // 2. Show a simple window that we create ourselves. We use a Begin/End pair
+    // to create a named window.
+    {
+      static float f = 0.0f;
+      static int counter = 0;
+
+      ImGui::Begin("Hello, world!");  // Create a window called "Hello, world!"
+                                      // and append into it.
+
+      ImGui::Text("This is some useful text.");  // Display some text (you can
+                                                 // use a format strings too)
+      ImGui::Checkbox(
+          "Demo Window",
+          &show_demo_window);  // Edit bools storing our window open/close state
+      ImGui::Checkbox("Another Window", &show_another_window);
+
+      ImGui::SliderFloat(
+          "float", &f, 0.0f,
+          1.0f);  // Edit 1 float using a slider from 0.0f to 1.0f
+      ImGui::ColorEdit3(
+          "clear color",
+          (float*)&clear_color);  // Edit 3 floats representing a color
+
+      if (ImGui::Button(
+              "Button"))  // Buttons return true when clicked (most widgets
+                          // return true when edited/activated)
+        counter++;
+      ImGui::SameLine();
+      ImGui::Text("counter = %d", counter);
+
+      ImGui::Text("Application average %.3f ms/frame (%.1f FPS)",
+                  1000.0f / io.Framerate, io.Framerate);
+      ImGui::End();
+    }
+
+    // 3. Show another simple window.
+    if (show_another_window) {
+      ImGui::Begin(
+          "Another Window",
+          &show_another_window);  // Pass a pointer to our bool variable (the
+                                  // window will have a closing button that will
+                                  // clear the bool when clicked)
+      ImGui::Text("Hello from another window!");
+      if (ImGui::Button("Close Me")) show_another_window = false;
+      ImGui::End();
+    }
+
+    // Rendering
+    ImGui::Render();
+    SDL_RenderSetScale(renderer, io.DisplayFramebufferScale.x,
+                       io.DisplayFramebufferScale.y);
+    SDL_SetRenderDrawColor(
+        renderer, (Uint8)(clear_color.x * 255), (Uint8)(clear_color.y * 255),
+        (Uint8)(clear_color.z * 255), (Uint8)(clear_color.w * 255));
+    SDL_RenderClear(renderer);
+    ImGui_ImplSDLRenderer2_RenderDrawData(ImGui::GetDrawData());
+    SDL_RenderPresent(renderer);
+  }
+
+  // Cleanup
+  ImGui_ImplSDLRenderer2_Shutdown();
+  ImGui_ImplSDL2_Shutdown();
+  ImGui::DestroyContext();
+
+  SDL_DestroyRenderer(renderer);
+  SDL_DestroyWindow(window);
+  SDL_Quit();
+
+  return 0;
+}