| // 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 GLUT/FreeGLUT IS OBSOLETE PREHISTORIC SOFTWARE.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 are obsolete since 1.87 and not supported since 1.91.5] | |
| // Missing features or 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. | |
| // Learn about Dear ImGui: | |
| // - FAQ https://dearimgui.com/faq | |
| // - Getting Started https://dearimgui.com/getting-started | |
| // - Documentation https://dearimgui.com/docs (same as your local docs/ folder). | |
| // - Introduction, links and more at the top of imgui.cpp | |
| // 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" | |
| #ifndef IMGUI_DISABLE | |
| #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 one 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(); | |
| IMGUI_CHECKVERSION(); | |
| #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); | |
| } | |
| //----------------------------------------------------------------------------- | |
| #endif // #ifndef IMGUI_DISABLE |