1 // ImGui - standalone example application for FreeGLUT + OpenGL2, using legacy fixed pipeline
2 // If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
3 // (Using GLUT or FreeGLUT is not recommended unless you really miss the 90's)
4
5 #include "imgui.h"
6 #include "../imgui_impl_freeglut.h"
7 #include "../imgui_impl_opengl2.h"
8 #include <GL/freeglut.h>
9
10 #ifdef _MSC_VER
11 #pragma warning (disable: 4505) // unreferenced local function has been removed
12 #endif
13
14 static bool show_demo_window = true;
15 static bool show_another_window = false;
16 static ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
17
my_display_code()18 void my_display_code()
19 {
20 // 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!).
21 if (show_demo_window)
22 ImGui::ShowDemoWindow(&show_demo_window);
23
24 // 2. Show a simple window that we create ourselves. We use a Begin/End pair to created a named window.
25 {
26 static float f = 0.0f;
27 static int counter = 0;
28
29 ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
30
31 ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
32 ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
33 ImGui::Checkbox("Another Window", &show_another_window);
34
35 ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
36 ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
37
38 if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated)
39 counter++;
40 ImGui::SameLine();
41 ImGui::Text("counter = %d", counter);
42
43 ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
44 ImGui::End();
45 }
46
47 // 3. Show another simple window.
48 if (show_another_window)
49 {
50 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)
51 ImGui::Text("Hello from another window!");
52 if (ImGui::Button("Close Me"))
53 show_another_window = false;
54 ImGui::End();
55 }
56 }
57
glut_display_func()58 void glut_display_func()
59 {
60 // Start the ImGui frame
61 ImGui_ImplOpenGL2_NewFrame();
62 ImGui_ImplFreeGLUT_NewFrame();
63
64 my_display_code();
65
66 // Rendering
67 ImGui::Render();
68 ImGuiIO& io = ImGui::GetIO();
69 glViewport(0, 0, (GLsizei)io.DisplaySize.x, (GLsizei)io.DisplaySize.y);
70 glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
71 glClear(GL_COLOR_BUFFER_BIT);
72 //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.
73 ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData());
74
75 glutSwapBuffers();
76 glutPostRedisplay();
77 }
78
79 // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
80 // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
81 // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
82 // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
83
main(int argc,char ** argv)84 int main(int argc, char** argv)
85 {
86 // Create GLUT window
87 glutInit(&argc, argv);
88 glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_GLUTMAINLOOP_RETURNS);
89 glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_MULTISAMPLE);
90 glutInitWindowSize(1280, 720);
91 glutCreateWindow("Dear ImGui FreeGLUT+OpenGL2 Example");
92
93 // Setup GLUT display function
94 // We will also call ImGui_ImplFreeGLUT_InstallFuncs() to get all the other functions installed for us,
95 // otherwise it is possible to install our own functions and call the imgui_impl_freeglut.h functions ourselves.
96 glutDisplayFunc(glut_display_func);
97
98 // Setup ImGui binding
99 ImGui::CreateContext();
100 ImGuiIO& io = ImGui::GetIO(); (void)io;
101 //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
102
103 ImGui_ImplFreeGLUT_Init();
104 ImGui_ImplFreeGLUT_InstallFuncs();
105 ImGui_ImplOpenGL2_Init();
106
107 // Setup style
108 ImGui::StyleColorsDark();
109 //ImGui::StyleColorsClassic();
110
111 // Load Fonts
112 // - 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.
113 // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
114 // - 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).
115 // - 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.
116 // - Read 'misc/fonts/README.txt' for more instructions and details.
117 // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
118 //io.Fonts->AddFontDefault();
119 //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
120 //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
121 //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
122 //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
123 //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
124 //IM_ASSERT(font != NULL);
125
126 glutMainLoop();
127
128 // Cleanup
129 ImGui_ImplOpenGL2_Shutdown();
130 ImGui_ImplFreeGLUT_Shutdown();
131 ImGui::DestroyContext();
132
133 return 0;
134 }
135