// dear imgui: Platform Backend for GLUT/FreeGLUT // This needs to be used along with a Renderer (e.g. OpenGL2) // !!! GLUT/FreeGLUT IS OBSOLETE PREHISTORIC SOFTWARE. Using GLUT is not recommended unless you really miss the 90's. !!! // !!! If someone or something is teaching you GLUT today, you are being abused. Please show some resistance. !!! // !!! Nowadays, prefer using GLFW or SDL instead! // Implemented features: // [X] Platform: Partial keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy GLUT values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set] // Issues: // [ ] Platform: GLUT is unable to distinguish e.g. Backspace from CTRL+H or TAB from CTRL+I // [ ] Platform: Missing horizontal mouse wheel support. // [ ] Platform: Missing mouse cursor shape/visibility support. // [ ] Platform: Missing clipboard support (not supported by Glut). // [ ] Platform: Missing gamepad support. // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need. // 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 // CHANGELOG // (minor and older changes stripped away, please see git history for details) // 2023-04-17: BREAKING: Removed call to ImGui::NewFrame() from ImGui_ImplGLUT_NewFrame(). Needs to be called from the main application loop, like with every other backends. // 2022-09-26: Inputs: Renamed ImGuiKey_ModXXX introduced in 1.87 to ImGuiMod_XXX (old names still supported). // 2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago) with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion. // 2022-01-17: Inputs: calling new io.AddMousePosEvent(), io.AddMouseButtonEvent(), io.AddMouseWheelEvent() API (1.87+). // 2022-01-10: Inputs: calling new io.AddKeyEvent(), io.AddKeyModsEvent() + io.SetKeyEventNativeData() API (1.87+). Support for full ImGuiKey range. // 2019-04-03: Misc: Renamed imgui_impl_freeglut.cpp/.h to imgui_impl_glut.cpp/.h. // 2019-03-25: Misc: Made io.DeltaTime always above zero. // 2018-11-30: Misc: Setting up io.BackendPlatformName so it can be displayed in the About Window. // 2018-03-22: Added GLUT Platform binding. #include "imgui.h" #include "imgui_impl_glut.h" #define GL_SILENCE_DEPRECATION #ifdef __APPLE__ #include <GLUT/glut.h> #else #include <GL/freeglut.h> #endif #ifdef _MSC_VER #pragma warning (disable: 4505) // unreferenced local function has been removed (stb stuff) #endif static int g_Time = 0; // Current time, in milliseconds // Glut has 1 function for characters and one for "special keys". We map the characters in the 0..255 range and the keys above. static ImGuiKey ImGui_ImplGLUT_KeyToImGuiKey(int key) { switch (key) { case '\t': return ImGuiKey_Tab; case 256 + GLUT_KEY_LEFT: return ImGuiKey_LeftArrow; case 256 + GLUT_KEY_RIGHT: return ImGuiKey_RightArrow; case 256 + GLUT_KEY_UP: return ImGuiKey_UpArrow; case 256 + GLUT_KEY_DOWN: return ImGuiKey_DownArrow; case 256 + GLUT_KEY_PAGE_UP: return ImGuiKey_PageUp; case 256 + GLUT_KEY_PAGE_DOWN: return ImGuiKey_PageDown; case 256 + GLUT_KEY_HOME: return ImGuiKey_Home; case 256 + GLUT_KEY_END: return ImGuiKey_End; case 256 + GLUT_KEY_INSERT: return ImGuiKey_Insert; case 127: return ImGuiKey_Delete; case 8: return ImGuiKey_Backspace; case ' ': return ImGuiKey_Space; case 13: return ImGuiKey_Enter; case 27: return ImGuiKey_Escape; case 39: return ImGuiKey_Apostrophe; case 44: return ImGuiKey_Comma; case 45: return ImGuiKey_Minus; case 46: return ImGuiKey_Period; case 47: return ImGuiKey_Slash; case 59: return ImGuiKey_Semicolon; case 61: return ImGuiKey_Equal; case 91: return ImGuiKey_LeftBracket; case 92: return ImGuiKey_Backslash; case 93: return ImGuiKey_RightBracket; case 96: return ImGuiKey_GraveAccent; //case 0: return ImGuiKey_CapsLock; //case 0: return ImGuiKey_ScrollLock; case 256 + 0x006D: return ImGuiKey_NumLock; //case 0: return ImGuiKey_PrintScreen; //case 0: return ImGuiKey_Pause; //case '0': return ImGuiKey_Keypad0; //case '1': return ImGuiKey_Keypad1; //case '2': return ImGuiKey_Keypad2; //case '3': return ImGuiKey_Keypad3; //case '4': return ImGuiKey_Keypad4; //case '5': return ImGuiKey_Keypad5; //case '6': return ImGuiKey_Keypad6; //case '7': return ImGuiKey_Keypad7; //case '8': return ImGuiKey_Keypad8; //case '9': return ImGuiKey_Keypad9; //case 46: return ImGuiKey_KeypadDecimal; //case 47: return ImGuiKey_KeypadDivide; case 42: return ImGuiKey_KeypadMultiply; //case 45: return ImGuiKey_KeypadSubtract; case 43: return ImGuiKey_KeypadAdd; //case 13: return ImGuiKey_KeypadEnter; //case 0: return ImGuiKey_KeypadEqual; case 256 + 0x0072: return ImGuiKey_LeftCtrl; case 256 + 0x0070: return ImGuiKey_LeftShift; case 256 + 0x0074: return ImGuiKey_LeftAlt; //case 0: return ImGuiKey_LeftSuper; case 256 + 0x0073: return ImGuiKey_RightCtrl; case 256 + 0x0071: return ImGuiKey_RightShift; case 256 + 0x0075: return ImGuiKey_RightAlt; //case 0: return ImGuiKey_RightSuper; //case 0: return ImGuiKey_Menu; case '0': return ImGuiKey_0; case '1': return ImGuiKey_1; case '2': return ImGuiKey_2; case '3': return ImGuiKey_3; case '4': return ImGuiKey_4; case '5': return ImGuiKey_5; case '6': return ImGuiKey_6; case '7': return ImGuiKey_7; case '8': return ImGuiKey_8; case '9': return ImGuiKey_9; case 'A': case 'a': return ImGuiKey_A; case 'B': case 'b': return ImGuiKey_B; case 'C': case 'c': return ImGuiKey_C; case 'D': case 'd': return ImGuiKey_D; case 'E': case 'e': return ImGuiKey_E; case 'F': case 'f': return ImGuiKey_F; case 'G': case 'g': return ImGuiKey_G; case 'H': case 'h': return ImGuiKey_H; case 'I': case 'i': return ImGuiKey_I; case 'J': case 'j': return ImGuiKey_J; case 'K': case 'k': return ImGuiKey_K; case 'L': case 'l': return ImGuiKey_L; case 'M': case 'm': return ImGuiKey_M; case 'N': case 'n': return ImGuiKey_N; case 'O': case 'o': return ImGuiKey_O; case 'P': case 'p': return ImGuiKey_P; case 'Q': case 'q': return ImGuiKey_Q; case 'R': case 'r': return ImGuiKey_R; case 'S': case 's': return ImGuiKey_S; case 'T': case 't': return ImGuiKey_T; case 'U': case 'u': return ImGuiKey_U; case 'V': case 'v': return ImGuiKey_V; case 'W': case 'w': return ImGuiKey_W; case 'X': case 'x': return ImGuiKey_X; case 'Y': case 'y': return ImGuiKey_Y; case 'Z': case 'z': return ImGuiKey_Z; case 256 + GLUT_KEY_F1: return ImGuiKey_F1; case 256 + GLUT_KEY_F2: return ImGuiKey_F2; case 256 + GLUT_KEY_F3: return ImGuiKey_F3; case 256 + GLUT_KEY_F4: return ImGuiKey_F4; case 256 + GLUT_KEY_F5: return ImGuiKey_F5; case 256 + GLUT_KEY_F6: return ImGuiKey_F6; case 256 + GLUT_KEY_F7: return ImGuiKey_F7; case 256 + GLUT_KEY_F8: return ImGuiKey_F8; case 256 + GLUT_KEY_F9: return ImGuiKey_F9; case 256 + GLUT_KEY_F10: return ImGuiKey_F10; case 256 + GLUT_KEY_F11: return ImGuiKey_F11; case 256 + GLUT_KEY_F12: return ImGuiKey_F12; default: return ImGuiKey_None; } } bool ImGui_ImplGLUT_Init() { ImGuiIO& io = ImGui::GetIO(); #ifdef FREEGLUT io.BackendPlatformName = "imgui_impl_glut (freeglut)"; #else io.BackendPlatformName = "imgui_impl_glut"; #endif g_Time = 0; return true; } void ImGui_ImplGLUT_InstallFuncs() { glutReshapeFunc(ImGui_ImplGLUT_ReshapeFunc); glutMotionFunc(ImGui_ImplGLUT_MotionFunc); glutPassiveMotionFunc(ImGui_ImplGLUT_MotionFunc); glutMouseFunc(ImGui_ImplGLUT_MouseFunc); #ifdef __FREEGLUT_EXT_H__ glutMouseWheelFunc(ImGui_ImplGLUT_MouseWheelFunc); #endif glutKeyboardFunc(ImGui_ImplGLUT_KeyboardFunc); glutKeyboardUpFunc(ImGui_ImplGLUT_KeyboardUpFunc); glutSpecialFunc(ImGui_ImplGLUT_SpecialFunc); glutSpecialUpFunc(ImGui_ImplGLUT_SpecialUpFunc); } void ImGui_ImplGLUT_Shutdown() { ImGuiIO& io = ImGui::GetIO(); io.BackendPlatformName = nullptr; } void ImGui_ImplGLUT_NewFrame() { // Setup time step ImGuiIO& io = ImGui::GetIO(); int current_time = glutGet(GLUT_ELAPSED_TIME); int delta_time_ms = (current_time - g_Time); if (delta_time_ms <= 0) delta_time_ms = 1; io.DeltaTime = delta_time_ms / 1000.0f; g_Time = current_time; } static void ImGui_ImplGLUT_UpdateKeyModifiers() { ImGuiIO& io = ImGui::GetIO(); int glut_key_mods = glutGetModifiers(); io.AddKeyEvent(ImGuiMod_Ctrl, (glut_key_mods & GLUT_ACTIVE_CTRL) != 0); io.AddKeyEvent(ImGuiMod_Shift, (glut_key_mods & GLUT_ACTIVE_SHIFT) != 0); io.AddKeyEvent(ImGuiMod_Alt, (glut_key_mods & GLUT_ACTIVE_ALT) != 0); } static void ImGui_ImplGLUT_AddKeyEvent(ImGuiKey key, bool down, int native_keycode) { ImGuiIO& io = ImGui::GetIO(); io.AddKeyEvent(key, down); io.SetKeyEventNativeData(key, native_keycode, -1); // To support legacy indexing (<1.87 user code) } void ImGui_ImplGLUT_KeyboardFunc(unsigned char c, int x, int y) { // Send character to imgui //printf("char_down_func %d '%c'\n", c, c); ImGuiIO& io = ImGui::GetIO(); if (c >= 32) io.AddInputCharacter((unsigned int)c); ImGuiKey key = ImGui_ImplGLUT_KeyToImGuiKey(c); ImGui_ImplGLUT_AddKeyEvent(key, true, c); ImGui_ImplGLUT_UpdateKeyModifiers(); (void)x; (void)y; // Unused } void ImGui_ImplGLUT_KeyboardUpFunc(unsigned char c, int x, int y) { //printf("char_up_func %d '%c'\n", c, c); ImGuiKey key = ImGui_ImplGLUT_KeyToImGuiKey(c); ImGui_ImplGLUT_AddKeyEvent(key, false, c); ImGui_ImplGLUT_UpdateKeyModifiers(); (void)x; (void)y; // Unused } void ImGui_ImplGLUT_SpecialFunc(int key, int x, int y) { //printf("key_down_func %d\n", key); ImGuiKey imgui_key = ImGui_ImplGLUT_KeyToImGuiKey(key + 256); ImGui_ImplGLUT_AddKeyEvent(imgui_key, true, key + 256); ImGui_ImplGLUT_UpdateKeyModifiers(); (void)x; (void)y; // Unused } void ImGui_ImplGLUT_SpecialUpFunc(int key, int x, int y) { //printf("key_up_func %d\n", key); ImGuiKey imgui_key = ImGui_ImplGLUT_KeyToImGuiKey(key + 256); ImGui_ImplGLUT_AddKeyEvent(imgui_key, false, key + 256); ImGui_ImplGLUT_UpdateKeyModifiers(); (void)x; (void)y; // Unused } void ImGui_ImplGLUT_MouseFunc(int glut_button, int state, int x, int y) { ImGuiIO& io = ImGui::GetIO(); io.AddMousePosEvent((float)x, (float)y); int button = -1; if (glut_button == GLUT_LEFT_BUTTON) button = 0; if (glut_button == GLUT_RIGHT_BUTTON) button = 1; if (glut_button == GLUT_MIDDLE_BUTTON) button = 2; if (button != -1 && (state == GLUT_DOWN || state == GLUT_UP)) io.AddMouseButtonEvent(button, state == GLUT_DOWN); } #ifdef __FREEGLUT_EXT_H__ void ImGui_ImplGLUT_MouseWheelFunc(int button, int dir, int x, int y) { ImGuiIO& io = ImGui::GetIO(); io.AddMousePosEvent((float)x, (float)y); if (dir != 0) io.AddMouseWheelEvent(0.0f, dir > 0 ? 1.0f : -1.0f); (void)button; // Unused } #endif void ImGui_ImplGLUT_ReshapeFunc(int w, int h) { ImGuiIO& io = ImGui::GetIO(); io.DisplaySize = ImVec2((float)w, (float)h); } void ImGui_ImplGLUT_MotionFunc(int x, int y) { ImGuiIO& io = ImGui::GetIO(); io.AddMousePosEvent((float)x, (float)y); }