main.cpp

// ImGui - standalone example application for GLFW + OpenGL 3, using programmable pipeline
// If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
// (GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
// (GL3W is a helper library to access OpenGL functions since there is no standard header to access modern OpenGL functions easily. Alternatives are GLEW, Glad, etc.)
//
// https://www.tcpdump.org/pcap.html
// http://api.libssh.org/master/libssh_tutor_command.html
// https://root.cern.ch/

#include "imgui.h"
#include "imgui_impl_glfw_gl3.h"
#include <stdio.h>
#include <GL/gl3w.h>    // This example is using gl3w to access OpenGL functions (because it is small). You may use glew/glad/glLoadGen/etc. whatever already works for you.
#include <GLFW/glfw3.h>
#include "colors.h"

static void glfw_error_callback(int error, const char* description)
{
  fprintf(stderr, "Error %d: %s\n", error, description);
}

int main(int, char**)
{
  // Setup window
  glfwSetErrorCallback(glfw_error_callback);
  if (!glfwInit())
  {
    return 1;
  }
  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#if __APPLE__
  glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif
  GLFWwindow* window = glfwCreateWindow(1280, 720, "IMGUI Theme", NULL, NULL);
  glfwMakeContextCurrent(window);
  glfwSwapInterval(1); // Enable vsync
  gl3wInit();

  // Setup Dear ImGui binding
  IMGUI_CHECKVERSION();
  ImGui::CreateContext();
  ImGuiIO& io = ImGui::GetIO();
  (void) io;
  //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
  //io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;   // Enable Gamepad Controls
  ImGui_ImplGlfwGL3_Init(window, true);

  // Setup style
  //ImGui::StyleColorsDark();
  //ImGui::StyleColorsClassic();
  //StyleColorsPurple();
  //StyleColorVulkan();
  StyleDarkAndPurple();

  // 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 NULL. 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.
  // - Read 'misc/fonts/README.txt' 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("./roboto/Roboto-Medium.ttf", 16.0f);
  //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
  //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
  //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
  //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
  //IM_ASSERT(font != NULL);

  bool show_demo_window = false;
  bool show_another_window = false;
  //ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
  //ImVec4 clear_color = ImVec4(0.364f, 0.327f, 0.380f, 1.000f);
  //ImVec4 clear_color = ImVec4(0.4f, 0.4f, 0.4f, 1.0f);
  ImVec4 clear_color = ImVec4(0.125f, 0.125f, 0.125f, 1.000f);

  ImGui::GetIO().FontGlobalScale = 2.0;

  // Main loop
  while (!glfwWindowShouldClose(window))
  {
    // 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.
    // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
    // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
    glfwPollEvents();
    ImGui_ImplGlfwGL3_NewFrame();

    if (ImGui::BeginMainMenuBar())
    {
      if (ImGui::BeginMenu("File"))
      {
        if (ImGui::MenuItem("Quit", "Alt+F4")) {}
        ImGui::EndMenu();
      }
      if (ImGui::BeginMenu("Edit"))
      {
        if (ImGui::MenuItem("Undo", "CTRL+Z"))
        {}
        if (ImGui::MenuItem("Redo", "CTRL+Y", false, false))
        {}  // Disabled item
        ImGui::Separator();
        if (ImGui::MenuItem("Cut", "CTRL+X"))
        {}
        if (ImGui::MenuItem("Copy", "CTRL+C"))
        {}
        if (ImGui::MenuItem("Paste", "CTRL+V"))
        {}
        ImGui::EndMenu();
      }
      ImGui::EndMainMenuBar();
    }

    // 1. Show a simple window.
    // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
    {
      static float f = 0.0f;
      static int counter = 0;
      ImGui::Text("Hello, world!");                           // Display some text (you can use a format string too)
      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

      ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our windows open/close state
      ImGui::Checkbox("Another Window", &show_another_window);

      if (ImGui::Button(
          "Button"))
      {                            // Buttons return true when clicked (NB: 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 / ImGui::GetIO().Framerate,
                  ImGui::GetIO().Framerate);
    }

    // 2. Show another simple window. In most cases you will use an explicit Begin/End pair to name your windows.
    if (show_another_window)
    {
      ImGui::Begin("Another Window", &show_another_window);
      ImGui::Text("Hello from another window!");
      if (ImGui::Button("Close Me"))
      {
        show_another_window = false;
      }
      ImGui::End();
    }

    // 3. Show the ImGui demo window. Most of the sample code is in ImGui::ShowDemoWindow(). Read its code to learn more about Dear ImGui!
    if (show_demo_window)
    {
      ImGui::SetNextWindowPos(ImVec2(650, 20),
                              ImGuiCond_FirstUseEver); // Normally user code doesn't need/want to call this because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
      ImGui::ShowDemoWindow(&show_demo_window);
    }

    // Rendering
    int display_w, display_h;
    glfwGetFramebufferSize(window, &display_w, &display_h);
    glViewport(0, 0, display_w, display_h);
    glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
    glClear(GL_COLOR_BUFFER_BIT);
    ImGui::Render();
    ImGui_ImplGlfwGL3_RenderDrawData(ImGui::GetDrawData());
    glfwSwapBuffers(window);
  }

  // Cleanup
  ImGui_ImplGlfwGL3_Shutdown();
  ImGui::DestroyContext();

  glfwDestroyWindow(window);
  glfwTerminate();

  return 0;
}