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【一】使用imgui（win32+opengl+imgui）_vs2022 imgui

作者：寸_铁 | 2024-06-22 02:23:05

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vs2022 imgui

1. 下载源码

git@github.com:ocornut/imgui.git

这里我下载的事 docking分支

git clone -b docking --recurse-submodules git@github.com:ocornut/imgui.git

2. 目录结构

3. 配置项目(win32+opengl)

  1. VS2022 创建一个空项目、新建imgui文件夹（放置imgui拷贝过来的文件）
  2. 拷贝源码根目录下所有头文件和源文件
  3. 拷贝backends目录下的imgui_impl_opengl3.cppimgui_impl_opengl3.h imgui_impl_opengl3_loader.h imgui_impl_win32.cpp imgui_impl_win32.h
  4. 拷贝misc目录下的cpp和 debuggers文件夹

  1. 设置include包含目录

$(SolutionDir)\imgui

$(SolutionDir)\imgui\backends

  1. 设置附加依赖项 opengl32.lib
  2. 添加头文件

#include "imgui.h"

#include "imgui_impl_opengl3.h"

#include "imgui_impl_win32.h"

#include <windows.h>

#include <GL/GL.h>

4. main.cpp

  1. //Windows 窗口数据
  2. struct WGL_WindowData { HDC hDC; };
  3. static HGLRC              g_hRC;          //opengl 句柄
  4. static WGL_WindowData     g_MainWindow;     //窗口句柄
  5. static int              g_Width;
  6. static int              g_Height;
  7.  
  8. //初始化opengl
  9. bool CreateDeviceWGL(HWND hWnd, WGL_WindowData* data)
  10. {
  11.     HDC hDc = ::GetDC(hWnd);
  12.     PIXELFORMATDESCRIPTOR pfd = { 0 };
  13.     pfd.nSize = sizeof(pfd);
  14.     pfd.nVersion = 1;
  15.     pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
  16.     pfd.iPixelType = PFD_TYPE_RGBA;
  17.     pfd.cColorBits = 32;
  18.  
  19.     const int pf = ::ChoosePixelFormat(hDc, &pfd);
  20.     if (pf == 0)
  21.         return false;
  22.     if (::SetPixelFormat(hDc, pf, &pfd) == FALSE)
  23.         return false;
  24.     ::ReleaseDC(hWnd, hDc);
  25.  
  26.     data->hDC = ::GetDC(hWnd);
  27.     if (!g_hRC)
  28.         g_hRC = wglCreateContext(data->hDC);
  29.     return true;
  30. }
  31.  
  32. //释放opengl
  33. void CleanupDeviceWGL(HWND hWnd, WGL_WindowData* data)
  34. {
  35.     wglMakeCurrent(nullptr, nullptr);
  36.     ::ReleaseDC(hWnd, data->hDC);
  37. }
  38.  
  39. static void Hook_Renderer_CreateWindow(ImGuiViewport* viewport)
  40. {
  41.     assert(viewport->RendererUserData == nullptr);
  42.  
  43.     WGL_WindowData* data = IM_NEW(WGL_WindowData);
  44.     CreateDeviceWGL((HWND)viewport->PlatformHandle, data);
  45.     viewport->RendererUserData = data;
  46. }
  47.  
  48. static void Hook_Renderer_DestroyWindow(ImGuiViewport* viewport)
  49. {
  50.     if (viewport->RendererUserData != nullptr)
  51.     {
  52.         WGL_WindowData* data = (WGL_WindowData*)viewport->RendererUserData;
  53.         CleanupDeviceWGL((HWND)viewport->PlatformHandle, data);
  54.         IM_DELETE(data);
  55.         viewport->RendererUserData = nullptr;
  56.     }
  57. }
  58.  
  59. static void Hook_Platform_RenderWindow(ImGuiViewport* viewport, void*)
  60. {
  61.     // Activate the platform window DC in the OpenGL rendering context
  62.     if (WGL_WindowData* data = (WGL_WindowData*)viewport->RendererUserData)
  63.         wglMakeCurrent(data->hDC, g_hRC);
  64. }
  65.  
  66. static void Hook_Renderer_SwapBuffers(ImGuiViewport* viewport, void*)
  67. {
  68.     if (WGL_WindowData* data = (WGL_WindowData*)viewport->RendererUserData)
  69.         ::SwapBuffers(data->hDC);
  70. }
  71.  
  72. extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
  73.  
  74. //窗口处理函数（自定义、处理消息）
  75. LRESULT APIENTRY WndProc(HWND hWnd, UINT msgID, WPARAM wParam, LPARAM lParam)
  76. {
  77.     if (ImGui_ImplWin32_WndProcHandler(hWnd, msgID, wParam, lParam))
  78.         return true;
  79.  
  80.     //处理消息
  81.     switch (msgID)
  82.     {
  83.     case WM_SIZE:
  84.         if (wParam != SIZE_MINIMIZED)
  85.         {
  86.             g_Width = LOWORD(lParam);
  87.             g_Height = HIWORD(lParam);
  88.         }
  89.         return 0;
  90.     case WM_SYSCOMMAND:
  91.         if ((wParam & 0xfff0) == SC_KEYMENU) //禁用ALT应用程序菜单
  92.             return 0;
  93.         break;
  94.     case WM_CREATE:
  95.         break;
  96.     case WM_DESTROY:
  97.         PostQuitMessage(0);
  98.         break;
  99.     default:
  100.         break;
  101.     }
  102.  
  103.     //给各种消息默认处理
  104.     return DefWindowProc(hWnd, msgID, wParam, lParam);
  105. }
  106.  
  107. int main(int argc, char* argv[])
  108. {
  109.  
  110.     //注册窗口类
  111.     WNDCLASS wc = { 0 };
  112.     wc.style = CS_OWNDC;//窗口类的风格
  113.     wc.lpfnWndProc = WndProc;//窗口处理函数
  114.     wc.cbClsExtra = 0;//窗口类的附加数据buff的大小			
  115.     wc.cbWndExtra = 0;//窗口的附加数据buff的大小
  116.     wc.hInstance = GetModuleHandle(nullptr);//当前模块实例句柄
  117.     wc.hIcon = nullptr;//窗口图标句柄
  118.     wc.hCursor = nullptr;//鼠标句柄
  119.     wc.hbrBackground = nullptr;//绘制窗口背景的画刷句柄
  120.     wc.lpszMenuName = nullptr;	//窗口菜单的资源id字符串
  121.     wc.lpszClassName = TEXT("mainWindow");//窗口类的名称
  122.  
  123.     RegisterClass(&wc);
  124.  
  125.     //创建窗口
  126.     HWND hWnd = CreateWindowEx(0, TEXT("mainWindow"), TEXT("window"), WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, nullptr, nullptr, wc.hInstance, nullptr);
  127.  
  128.     //初始化OpenGL
  129.     if (!CreateDeviceWGL(hWnd, &g_MainWindow))
  130.     {
  131.         CleanupDeviceWGL(hWnd, &g_MainWindow);
  132.         ::DestroyWindow(hWnd);
  133.         ::UnregisterClassW(wc.lpszClassName, wc.hInstance);
  134.         return 1;
  135.     }
  136.     wglMakeCurrent(g_MainWindow.hDC, g_hRC);
  137.  
  138.     //显示窗口
  139.     ShowWindow(hWnd, SW_SHOWDEFAULT);
  140.     UpdateWindow(hWnd);
  141.  
  142.     //设置 imgui上下文
  143.     IMGUI_CHECKVERSION();
  144.     ImGui::CreateContext();
  145.     ImGuiIO& io = ImGui::GetIO(); (void)io;
  146.     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;   // 键盘控制
  147.     io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;    // Gamepad
  148.     io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;       // Docking
  149.     io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;     // Multi-Viewport / Platform Windows
  150.  
  151.     //设置窗口风格
  152.     ImGui::StyleColorsDark();
  153.  
  154.     //ImGuiConfigFlags_ViewportsEnable 启用后，调整WindowRounding/WindowBg 使平台窗口看起来与常规窗口相同
  155.     ImGuiStyle& style = ImGui::GetStyle();
  156.     if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
  157.     {
  158.         style.WindowRounding = 0.0f;
  159.         style.Colors[ImGuiCol_WindowBg].w = 1.0f;
  160.     }
  161.  
  162.     //设置平台/渲染器后端-opengl
  163.     ImGui_ImplWin32_InitForOpenGL(hWnd);
  164.     ImGui_ImplOpenGL3_Init();
  165.  
  166.     //通过hook连接Win32和GLapi。
  167.     if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
  168.     {
  169.         ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
  170.         IM_ASSERT(platform_io.Renderer_CreateWindow == nullptr);
  171.         IM_ASSERT(platform_io.Renderer_DestroyWindow == nullptr);
  172.         IM_ASSERT(platform_io.Renderer_SwapBuffers == nullptr);
  173.         IM_ASSERT(platform_io.Platform_RenderWindow == nullptr);
  174.         platform_io.Renderer_CreateWindow = Hook_Renderer_CreateWindow;
  175.         platform_io.Renderer_DestroyWindow = Hook_Renderer_DestroyWindow;
  176.         platform_io.Renderer_SwapBuffers = Hook_Renderer_SwapBuffers;
  177.         platform_io.Platform_RenderWindow = Hook_Platform_RenderWindow;
  178.     }
  179.     ImVec4 clear_color = ImVec4(0.50f, 0.50f, 0.50f, 1.00f);
  180.  
  181.     //消息循环
  182.     bool done = false;
  183.     while (!done)
  184.     {
  185.         MSG nMsg = { 0 };
  186.         //轮询和处理消息
  187.         while (::PeekMessage(&nMsg, nullptr, 0U, 0U, PM_REMOVE))
  188.         {
  189.             TranslateMessage(&nMsg);        //翻译键盘消息
  190.             DispatchMessage(&nMsg);         //派发消息，将消息交给窗口处理函数
  191.             if (nMsg.message == WM_QUIT)
  192.                 done = true;
  193.         }
  194.         if (done)
  195.             break;
  196.  
  197.         //imgui
  198.         ImGui_ImplOpenGL3_NewFrame();
  199.         ImGui_ImplWin32_NewFrame();
  200.         ImGui::NewFrame();
  201.  
  202.         //显示窗口
  203.         static int counter = 0;
  204.         ImGui::Begin("window!");
  205.         ImGui::Text("helloworld.");
  206.         if (ImGui::Button("Button"))
  207.             counter++;
  208.         ImGui::Text("counter = %d", counter);
  209.         
  210.        /* bool bShowDemoWindow = true;
  211.         ImGui::ShowDemoWindow(&bShowDemoWindow);*/
  212.         ImGui::End();
  213.  
  214.         //渲染
  215.         ImGui::Render();
  216.         glViewport(0, 0, g_Width, g_Height);
  217.         glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
  218.         glClear(GL_COLOR_BUFFER_BIT);
  219.         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
  220.  
  221.         //更新渲染 windows平台
  222.         if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
  223.         {
  224.             ImGui::UpdatePlatformWindows();
  225.             ImGui::RenderPlatformWindowsDefault();
  226.  
  227.             //将OpenGL渲染上下文恢复到主窗口DC，因为平台窗口可能已经更改了它。
  228.             wglMakeCurrent(g_MainWindow.hDC, g_hRC);
  229.         }
  230.  
  231.         ::SwapBuffers(g_MainWindow.hDC);
  232.     }
  233.  
  234.     ImGui_ImplOpenGL3_Shutdown();
  235.     ImGui_ImplWin32_Shutdown();
  236.     ImGui::DestroyContext();
  237.  
  238.     CleanupDeviceWGL(hWnd, &g_MainWindow);
  239.     wglDeleteContext(g_hRC);
  240.     ::DestroyWindow(hWnd);
  241.     ::UnregisterClassW(wc.lpszClassName, wc.hInstance);
  242.  
  243. 	return 0;
  244. }

完整源码 GitHub - jermydu/LearnImgui

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