【C++】从零开始的CS:GO逆向分析2——配置GLFW+IMGUI环境并创建透明窗口

// Dear ImGui: standalone example application for GLFW + OpenGL 3, using programmable pipeline // (GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.) // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp. // Read online: https://github.com/ocornut/imgui/tree/master/docs  #include "imgui/imgui.h" #include "imgui/imgui_impl_glfw.h" #include "imgui/imgui_impl_opengl3.h" #include <stdio.h> #if defined(IMGUI_IMPL_OPENGL_ES2) #include <GLES2/gl2.h> #endif #include <GLFW/glfw3.h> // Will drag system OpenGL headers  // [Win32] Our example includes a copy of glfw3.lib pre-compiled with VS2010 to maximize ease of testing and compatibility with old VS compilers. // To link with VS2010-era libraries, VS2015+ requires linking with legacy_stdio_definitions.lib, which we do using this pragma. // Your own project should not be affected, as you are likely to link with a newer binary of GLFW that is adequate for your version of Visual Studio. #if defined(_MSC_VER) && (_MSC_VER >= 1900) && !defined(IMGUI_DISABLE_WIN32_FUNCTIONS) #pragma comment(lib, "legacy_stdio_definitions") #endif  static void glfw_error_callback(int error, const char* description) {     fprintf(stderr, "Glfw Error %d: %sn", error, description); }  int main(int, char**) {     // Setup window     glfwSetErrorCallback(glfw_error_callback);     if (!glfwInit())         return 1;      // Decide GL+GLSL versions #if defined(IMGUI_IMPL_OPENGL_ES2)     // GL ES 2.0 + GLSL 100     const char* glsl_version = "#version 100";     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);     glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API); #elif defined(__APPLE__)     // GL 3.2 + GLSL 150     const char* glsl_version = "#version 150";     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);     glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+ only     glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);            // Required on Mac #else     // GL 3.0 + GLSL 130     const char* glsl_version = "#version 130";     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);     //glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+ only     //glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);            // 3.0+ only #endif      // Create window with graphics context     GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+OpenGL3 example", NULL, NULL);     if (window == NULL)         return 1;     glfwMakeContextCurrent(window);     glfwSwapInterval(1); // Enable vsync      // 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_ImplGlfw_InitForOpenGL(window, true);     ImGui_ImplOpenGL3_Init(glsl_version);      // 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 '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("../../misc/fonts/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);      // 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     while (!glfwWindowShouldClose(window))     {         // 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.         glfwPollEvents();          // Start the Dear ImGui frame         ImGui_ImplOpenGL3_NewFrame();         ImGui_ImplGlfw_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 created 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 / ImGui::GetIO().Framerate, ImGui::GetIO().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();         int display_w, display_h;         glfwGetFramebufferSize(window, &display_w, &display_h);         glViewport(0, 0, display_w, display_h);         glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w);         glClear(GL_COLOR_BUFFER_BIT);         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());          glfwSwapBuffers(window);     }      // Cleanup     ImGui_ImplOpenGL3_Shutdown();     ImGui_ImplGlfw_Shutdown();     ImGui::DestroyContext();      glfwDestroyWindow(window);     glfwTerminate();      return 0; }