| // Dear ImGui: standalone example application for GLFW + OpenGL2, using legacy fixed 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 |
| |
| // **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)** |
| // **Prefer using the code in the example_glfw_opengl2/ folder** |
| // See imgui_impl_glfw.cpp for details. |
| |
| #include "imgui.h" |
| #include "imgui_impl_glfw.h" |
| #include "imgui_impl_opengl2.h" |
| #include <stdio.h> |
| #ifdef __APPLE__ |
| #define GL_SILENCE_DEPRECATION |
| #endif |
| #include <GLFW/glfw3.h> |
| |
| // [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: %s\n", error, description); |
| } |
| |
| int main(int, char**) |
| { |
| // Setup window |
| glfwSetErrorCallback(glfw_error_callback); |
| if (!glfwInit()) |
| return 1; |
| GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+OpenGL2 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 |
| io.ConfigFlags |= ImGuiConfigFlags_DockingEnable; // Enable Docking |
| io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable; // Enable Multi-Viewport / Platform Windows |
| //io.ConfigViewportsNoAutoMerge = true; |
| //io.ConfigViewportsNoTaskBarIcon = true; |
| |
| // Setup Dear ImGui style |
| ImGui::StyleColorsDark(); |
| //ImGui::StyleColorsClassic(); |
| |
| // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones. |
| ImGuiStyle& style = ImGui::GetStyle(); |
| if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) |
| { |
| style.WindowRounding = 0.0f; |
| style.Colors[ImGuiCol_WindowBg].w = 1.0f; |
| } |
| |
| // Setup Platform/Renderer backends |
| ImGui_ImplGlfw_InitForOpenGL(window, true); |
| ImGui_ImplOpenGL2_Init(); |
| |
| // 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. |
| // - 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(); |
| |
| // Start the Dear ImGui frame |
| ImGui_ImplOpenGL2_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.y, clear_color.z, clear_color.w); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // If you are using this code with non-legacy OpenGL header/contexts (which you should not, prefer using imgui_impl_opengl3.cpp!!), |
| // you may need to backup/reset/restore current shader using the commented lines below. |
| //GLint last_program; |
| //glGetIntegerv(GL_CURRENT_PROGRAM, &last_program); |
| //glUseProgram(0); |
| ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData()); |
| //glUseProgram(last_program); |
| |
| // Update and Render additional Platform Windows |
| // (Platform functions may change the current OpenGL context, so we save/restore it to make it easier to paste this code elsewhere. |
| // For this specific demo app we could also call glfwMakeContextCurrent(window) directly) |
| if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) |
| { |
| GLFWwindow* backup_current_context = glfwGetCurrentContext(); |
| ImGui::UpdatePlatformWindows(); |
| ImGui::RenderPlatformWindowsDefault(); |
| glfwMakeContextCurrent(backup_current_context); |
| } |
| |
| glfwSwapBuffers(window); |
| } |
| |
| // Cleanup |
| ImGui_ImplOpenGL2_Shutdown(); |
| ImGui_ImplGlfw_Shutdown(); |
| ImGui::DestroyContext(); |
| |
| glfwDestroyWindow(window); |
| glfwTerminate(); |
| |
| return 0; |
| } |