text: // ImGui GLFW binding with OpenGL (legacy, fixed pipeline)
  // (GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
  
  // Implemented features:
  //  [X] User texture binding. Cast 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
  
  // **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)**
  // **Prefer using the code in the opengl3_example/ folder**
  // This code is mostly provided as a reference to learn how ImGui integration works, because it is shorter to read.
  // If your code is using GL3+ context or any semi modern OpenGL calls, using this is likely to make everything more
  // complicated, will require your code to reset every single OpenGL attributes to their initial state, and might
  // confuse your GPU driver. 
  // The GL2 code is unable to reset attributes or even call e.g. "glUseProgram(0)" because they don't exist in that API.
  
  // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
  // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().
  // If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
  // https://github.com/ocornut/imgui
  
  #include "imgui.h"
  #include "imgui_impl_glfw_gl2.h"
  
  // GLFW
  #include <GLFW/glfw3.h>
  #ifdef _WIN32
  #undef APIENTRY
  #define GLFW_EXPOSE_NATIVE_WIN32
  #define GLFW_EXPOSE_NATIVE_WGL
  #include <GLFW/glfw3native.h>
  #endif
  
  // Data
  static GLFWwindow*  g_Window = NULL;
  static double       g_Time = 0.0f;
  static bool         g_MouseJustPressed[3] = { false, false, false };
  static GLuint       g_FontTexture = 0;
  
  // This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
  void ImGui_ImplGlfwGL2_RenderDrawLists(ImDrawData* draw_data)
  // Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly, in order to be able to run within any OpenGL engine that doesn't do so. 
  // If text or lines are blurry when integrating ImGui in your engine: in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
  {
      // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
      ImGuiIO& io = ImGui::GetIO();
      int fb_width = (int)(io.DisplaySize.x * io.DisplayFramebufferScale.x);
      int fb_height = (int)(io.DisplaySize.y * io.DisplayFramebufferScale.y);
      if (fb_width == 0 || fb_height == 0)
          return;
      draw_data->ScaleClipRects(io.DisplayFramebufferScale);
  
      // We are using the OpenGL fixed pipeline to make the example code simpler to read!
      // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, vertex/texcoord/color pointers, polygon fill.
      GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
      GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
      GLint last_viewport[4]; glGetIntegerv(GL_VIEWPORT, last_viewport);
      GLint last_scissor_box[4]; glGetIntegerv(GL_SCISSOR_BOX, last_scissor_box); 
      glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_TRANSFORM_BIT);
      glEnable(GL_BLEND);
      glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
      glDisable(GL_CULL_FACE);
      glDisable(GL_DEPTH_TEST);
      glEnable(GL_SCISSOR_TEST);
      glEnableClientState(GL_VERTEX_ARRAY);
      glEnableClientState(GL_TEXTURE_COORD_ARRAY);
      glEnableClientState(GL_COLOR_ARRAY);
      glEnable(GL_TEXTURE_2D);
      glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
      //glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound
  
      // Setup viewport, orthographic projection matrix
      glViewport(0, 0, (GLsizei)fb_width, (GLsizei)fb_height);
      glMatrixMode(GL_PROJECTION);
      glPushMatrix();
      glLoadIdentity();
      glOrtho(0.0f, io.DisplaySize.x, io.DisplaySize.y, 0.0f, -1.0f, +1.0f);
      glMatrixMode(GL_MODELVIEW);
      glPushMatrix();
      glLoadIdentity();
  
      // Render command lists
      for (int n = 0; n < draw_data->CmdListsCount; n++)
      {
          const ImDrawList* cmd_list = draw_data->CmdLists[n];
          const ImDrawVert* vtx_buffer = cmd_list->VtxBuffer.Data;
          const ImDrawIdx* idx_buffer = cmd_list->IdxBuffer.Data;
          glVertexPointer(2, GL_FLOAT, sizeof(ImDrawVert), (const GLvoid*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, pos)));
          glTexCoordPointer(2, GL_FLOAT, sizeof(ImDrawVert), (const GLvoid*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, uv)));
          glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(ImDrawVert), (const GLvoid*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, col)));
  
          for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
          {
              const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
              if (pcmd->UserCallback)
              {
                  pcmd->UserCallback(cmd_list, pcmd);
              }
              else
              {
                  glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId);
                  glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y));
                  glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, idx_buffer);
              }
              idx_buffer += pcmd->ElemCount;
          }
      }
  
      // Restore modified state
      glDisableClientState(GL_COLOR_ARRAY);
      glDisableClientState(GL_TEXTURE_COORD_ARRAY);
      glDisableClientState(GL_VERTEX_ARRAY);
      glBindTexture(GL_TEXTURE_2D, (GLuint)last_texture);
      glMatrixMode(GL_MODELVIEW);
      glPopMatrix();
      glMatrixMode(GL_PROJECTION);
      glPopMatrix();
      glPopAttrib();
      glPolygonMode(GL_FRONT, last_polygon_mode[0]); glPolygonMode(GL_BACK, last_polygon_mode[1]);
      glViewport(last_viewport[0], last_viewport[1], (GLsizei)last_viewport[2], (GLsizei)last_viewport[3]);
      glScissor(last_scissor_box[0], last_scissor_box[1], (GLsizei)last_scissor_box[2], (GLsizei)last_scissor_box[3]);
  }
  
  static const char* ImGui_ImplGlfwGL2_GetClipboardText(void* user_data)
  {
      return glfwGetClipboardString((GLFWwindow*)user_data);
  }
  
  static void ImGui_ImplGlfwGL2_SetClipboardText(void* user_data, const char* text)
  {
      glfwSetClipboardString((GLFWwindow*)user_data, text);
  }
  
  void ImGui_ImplGlfwGL2_MouseButtonCallback(GLFWwindow*, int button, int action, int /*mods*/)
  {
      if (action == GLFW_PRESS && button >= 0 && button < 3)
          g_MouseJustPressed[button] = true;
  }
  
  void ImGui_ImplGlfwGL2_ScrollCallback(GLFWwindow*, double xoffset, double yoffset)
  {
      ImGuiIO& io = ImGui::GetIO();
      io.MouseWheelH += (float)xoffset;
      io.MouseWheel += (float)yoffset;
  }
  
  void ImGui_ImplGlfwGL2_KeyCallback(GLFWwindow*, int key, int, int action, int mods)
  {
      ImGuiIO& io = ImGui::GetIO();
      if (action == GLFW_PRESS)
          io.KeysDown[key] = true;
      if (action == GLFW_RELEASE)
          io.KeysDown[key] = false;
  
      (void)mods; // Modifiers are not reliable across systems
      io.KeyCtrl = io.KeysDown[GLFW_KEY_LEFT_CONTROL] || io.KeysDown[GLFW_KEY_RIGHT_CONTROL];
      io.KeyShift = io.KeysDown[GLFW_KEY_LEFT_SHIFT] || io.KeysDown[GLFW_KEY_RIGHT_SHIFT];
      io.KeyAlt = io.KeysDown[GLFW_KEY_LEFT_ALT] || io.KeysDown[GLFW_KEY_RIGHT_ALT];
      io.KeySuper = io.KeysDown[GLFW_KEY_LEFT_SUPER] || io.KeysDown[GLFW_KEY_RIGHT_SUPER];
  }
  
  void ImGui_ImplGlfwGL2_CharCallback(GLFWwindow*, unsigned int c)
  {
      ImGuiIO& io = ImGui::GetIO();
      if (c > 0 && c < 0x10000)
          io.AddInputCharacter((unsigned short)c);
  }
  
  bool ImGui_ImplGlfwGL2_CreateDeviceObjects()
  {
      // Build texture atlas
      ImGuiIO& io = ImGui::GetIO();
      unsigned char* pixels;
      int width, height;
      io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);   // Load as RGBA 32-bits (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
  
      // Upload texture to graphics system
      GLint last_texture;
      glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
      glGenTextures(1, &g_FontTexture);
      glBindTexture(GL_TEXTURE_2D, g_FontTexture);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
  
      // Store our identifier
      io.Fonts->TexID = (void *)(intptr_t)g_FontTexture;
  
      // Restore state
      glBindTexture(GL_TEXTURE_2D, last_texture);
  
      return true;
  }
  
  void    ImGui_ImplGlfwGL2_InvalidateDeviceObjects()
  {
      if (g_FontTexture)
      {
          glDeleteTextures(1, &g_FontTexture);
          ImGui::GetIO().Fonts->TexID = 0;
          g_FontTexture = 0;
      }
  }
  
  bool    ImGui_ImplGlfwGL2_Init(GLFWwindow* window, bool install_callbacks)
  {
      g_Window = window;
  
      ImGuiIO& io = ImGui::GetIO();
      io.KeyMap[ImGuiKey_Tab] = GLFW_KEY_TAB;                     // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array.
      io.KeyMap[ImGuiKey_LeftArrow] = GLFW_KEY_LEFT;
      io.KeyMap[ImGuiKey_RightArrow] = GLFW_KEY_RIGHT;
      io.KeyMap[ImGuiKey_UpArrow] = GLFW_KEY_UP;
      io.KeyMap[ImGuiKey_DownArrow] = GLFW_KEY_DOWN;
      io.KeyMap[ImGuiKey_PageUp] = GLFW_KEY_PAGE_UP;
      io.KeyMap[ImGuiKey_PageDown] = GLFW_KEY_PAGE_DOWN;
      io.KeyMap[ImGuiKey_Home] = GLFW_KEY_HOME;
      io.KeyMap[ImGuiKey_End] = GLFW_KEY_END;
      io.KeyMap[ImGuiKey_Insert] = GLFW_KEY_INSERT;
      io.KeyMap[ImGuiKey_Delete] = GLFW_KEY_DELETE;
      io.KeyMap[ImGuiKey_Backspace] = GLFW_KEY_BACKSPACE;
      io.KeyMap[ImGuiKey_Space] = GLFW_KEY_SPACE;
      io.KeyMap[ImGuiKey_Enter] = GLFW_KEY_ENTER;
      io.KeyMap[ImGuiKey_Escape] = GLFW_KEY_ESCAPE;
      io.KeyMap[ImGuiKey_A] = GLFW_KEY_A;
      io.KeyMap[ImGuiKey_C] = GLFW_KEY_C;
      io.KeyMap[ImGuiKey_V] = GLFW_KEY_V;
      io.KeyMap[ImGuiKey_X] = GLFW_KEY_X;
      io.KeyMap[ImGuiKey_Y] = GLFW_KEY_Y;
      io.KeyMap[ImGuiKey_Z] = GLFW_KEY_Z;
  
      io.RenderDrawListsFn = ImGui_ImplGlfwGL2_RenderDrawLists;      // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
      io.SetClipboardTextFn = ImGui_ImplGlfwGL2_SetClipboardText;
      io.GetClipboardTextFn = ImGui_ImplGlfwGL2_GetClipboardText;
      io.ClipboardUserData = g_Window;
  #ifdef _WIN32
      io.ImeWindowHandle = glfwGetWin32Window(g_Window);
  #endif
  
      if (install_callbacks)
      {
          glfwSetMouseButtonCallback(window, ImGui_ImplGlfwGL2_MouseButtonCallback);
          glfwSetScrollCallback(window, ImGui_ImplGlfwGL2_ScrollCallback);
          glfwSetKeyCallback(window, ImGui_ImplGlfwGL2_KeyCallback);
          glfwSetCharCallback(window, ImGui_ImplGlfwGL2_CharCallback);
      }
  
      return true;
  }
  
  void ImGui_ImplGlfwGL2_Shutdown()
  {
      ImGui_ImplGlfwGL2_InvalidateDeviceObjects();
  }
  
  void ImGui_ImplGlfwGL2_NewFrame()
  {
      if (!g_FontTexture)
          ImGui_ImplGlfwGL2_CreateDeviceObjects();
  
      ImGuiIO& io = ImGui::GetIO();
  
      // Setup display size (every frame to accommodate for window resizing)
      int w, h;
      int display_w, display_h;
      glfwGetWindowSize(g_Window, &w, &h);
      glfwGetFramebufferSize(g_Window, &display_w, &display_h);
      io.DisplaySize = ImVec2((float)w, (float)h);
      io.DisplayFramebufferScale = ImVec2(w > 0 ? ((float)display_w / w) : 0, h > 0 ? ((float)display_h / h) : 0);
  
      // Setup time step
      double current_time =  glfwGetTime();
      io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f/60.0f);
      g_Time = current_time;
  
      // Setup inputs
      // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents())
      if (glfwGetWindowAttrib(g_Window, GLFW_FOCUSED))
      {
          if (io.WantMoveMouse)
          {
              glfwSetCursorPos(g_Window, (double)io.MousePos.x, (double)io.MousePos.y);   // Set mouse position if requested by io.WantMoveMouse flag (used when io.NavMovesTrue is enabled by user and using directional navigation)
          }
          else
          {
              double mouse_x, mouse_y;
              glfwGetCursorPos(g_Window, &mouse_x, &mouse_y);
              io.MousePos = ImVec2((float)mouse_x, (float)mouse_y);
          }
      }
      else
      {
          io.MousePos = ImVec2(-FLT_MAX,-FLT_MAX);
      }
  
      for (int i = 0; i < 3; i++)
      {
          // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
          io.MouseDown[i] = g_MouseJustPressed[i] || glfwGetMouseButton(g_Window, i) != 0;
          g_MouseJustPressed[i] = false;
      }
  
      // Hide OS mouse cursor if ImGui is drawing it
      glfwSetInputMode(g_Window, GLFW_CURSOR, io.MouseDrawCursor ? GLFW_CURSOR_HIDDEN : GLFW_CURSOR_NORMAL);
  
      // Start the frame. This call will update the io.WantCaptureMouse, io.WantCaptureKeyboard flag that you can use to dispatch inputs (or not) to your application.
      ImGui::NewFrame();
  }
  