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// dear imgui: standalone example application for GLFW + OpenGL2, using legacy fixed pipeline
// If you are new to dear imgui, see examples/README.txt and documentation at the top of imgui.cpp.
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// (GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
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// **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)**
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// **Prefer using the code in the example_glfw_opengl2/ folder**
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// See imgui_impl_glfw.cpp for details.
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# include "imgui.h"
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# include "imgui_impl_glfw.h"
# include "imgui_impl_opengl2.h"
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# include <stdio.h>
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# include <GLFW/glfw3.h>
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static void glfw_error_callback ( int error , const char * description )
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{
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fprintf ( stderr , " Glfw Error %d: %s \n " , error , description ) ;
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}
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int main ( int , char * * )
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{
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// Setup window
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glfwSetErrorCallback ( glfw_error_callback ) ;
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if ( ! glfwInit ( ) )
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return 1 ;
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GLFWwindow * window = glfwCreateWindow ( 1280 , 720 , " Dear ImGui GLFW+OpenGL2 example " , NULL , NULL ) ;
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if ( window = = NULL )
return 1 ;
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glfwMakeContextCurrent ( window ) ;
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glfwSwapInterval ( 1 ) ; // Enable vsync
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// Setup Dear ImGui binding
IMGUI_CHECKVERSION ( ) ;
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ImGui : : CreateContext ( ) ;
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ImGuiIO & io = ImGui : : GetIO ( ) ; ( void ) io ;
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io . ConfigFlags | = ImGuiConfigFlags_NavEnableKeyboard ; // Enable Keyboard Controls
//io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
io . ConfigFlags | = ImGuiConfigFlags_DockingEnable ; // Enable Docking
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io . ConfigFlags | = ImGuiConfigFlags_ViewportsEnable ; // Enable Multi-Viewport / Platform Windows
//io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoTaskBarIcons;
//io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoMerge;
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ImGui_ImplGlfw_InitForOpenGL ( window , true ) ;
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ImGui_ImplOpenGL2_Init ( ) ;
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// Setup style
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ImGui : : StyleColorsDark ( ) ;
//ImGui::StyleColorsClassic();
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// Load Fonts
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// - 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.
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// - Read 'misc/fonts/README.txt' for more instructions and details.
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// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
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//io.Fonts->AddFontDefault();
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//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);
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//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
//IM_ASSERT(font != NULL);
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bool show_demo_window = true ;
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bool show_another_window = false ;
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ImVec4 clear_color = ImVec4 ( 0.45f , 0.55f , 0.60f , 1.00f ) ;
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// Main loop
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while ( ! glfwWindowShouldClose ( window ) )
{
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// Poll and handle events (inputs, window resize, etc.)
Examples: Added a bunch of comments/referencs related to io.WantCaptureMouse, io.WantCaptureKeyboard (#1262, #1237, #1219, #635, #1058, #1051, #912, #533, #703, #446, #459, #364, #213, #52, and more)
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// 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.
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glfwPollEvents ( ) ;
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// Start the Dear ImGui frame
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ImGui_ImplOpenGL2_NewFrame ( ) ;
ImGui_ImplGlfw_NewFrame ( ) ;
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ImGui : : NewFrame ( ) ;
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// 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.
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{
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static float f = 0.0f ;
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static int counter = 0 ;
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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
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ImGui : : Checkbox ( " Another Window " , & show_another_window ) ;
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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)
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counter + + ;
ImGui : : SameLine ( ) ;
ImGui : : Text ( " counter = %d " , counter ) ;
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ImGui : : Text ( " Application average %.3f ms/frame (%.1f FPS) " , 1000.0f / ImGui : : GetIO ( ) . Framerate , ImGui : : GetIO ( ) . Framerate ) ;
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ImGui : : End ( ) ;
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}
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// 3. Show another simple window.
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if ( show_another_window )
{
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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)
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ImGui : : Text ( " Hello from another window! " ) ;
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if ( ImGui : : Button ( " Close Me " ) )
show_another_window = false ;
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ImGui : : End ( ) ;
}
// Rendering
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ImGui : : Render ( ) ;
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int display_w , display_h ;
glfwGetFramebufferSize ( window , & display_w , & display_h ) ;
glViewport ( 0 , 0 , display_w , display_h ) ;
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glClearColor ( clear_color . x , clear_color . y , clear_color . z , clear_color . w ) ;
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glClear ( GL_COLOR_BUFFER_BIT ) ;
Examples: Added a bunch of comments/referencs related to io.WantCaptureMouse, io.WantCaptureKeyboard (#1262, #1237, #1219, #635, #1058, #1051, #912, #533, #703, #446, #459, #364, #213, #52, and more)
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//glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound, but prefer using the GL3+ code.
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ImGui_ImplOpenGL2_RenderDrawData ( ImGui : : GetDrawData ( ) ) ;
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// Update and Render additional Platform Windows
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if ( io . ConfigFlags & ImGuiConfigFlags_ViewportsEnable )
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{
ImGui : : UpdatePlatformWindows ( ) ;
ImGui : : RenderPlatformWindowsDefault ( ) ;
}
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glfwMakeContextCurrent ( window ) ;
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glfwSwapBuffers ( window ) ;
}
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// Cleanup
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ImGui_ImplOpenGL2_Shutdown ( ) ;
ImGui_ImplGlfw_Shutdown ( ) ;
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ImGui : : DestroyContext ( ) ;
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glfwDestroyWindow ( window ) ;
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glfwTerminate ( ) ;
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return 0 ;
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}