| // 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 GLUT/FreeGLUT IS OBSOLETE PREHISTORIC SOFTWARE.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 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) |
| // 2022-01-05: Inputs: calling new io.AddKeyEvent() API (1.87+), support for full keys 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" |
| #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 + 0x0070: return ImGuiKey_LeftShift; |
| case 256 + 0x0072: return ImGuiKey_LeftControl; |
| case 256 + 0x0074: return ImGuiKey_LeftAlt; |
| //case 0: return ImGuiKey_LeftSuper; |
| case 256 + 0x0071: return ImGuiKey_RightShift; |
| case 256 + 0x0073: return ImGuiKey_RightControl; |
| 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() |
| { |
| } |
| |
| 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; |
| |
| // Start the frame |
| ImGui::NewFrame(); |
| } |
| |
| static void ImGui_ImplGLUT_UpdateKeyboardMods() |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| int glut_key_mods = glutGetModifiers(); |
| ImGuiKeyModFlags key_mods = |
| ((glut_key_mods & GLUT_ACTIVE_CTRL) ? ImGuiKeyModFlags_Ctrl : 0) | |
| ((glut_key_mods & GLUT_ACTIVE_SHIFT) ? ImGuiKeyModFlags_Shift : 0) | |
| ((glut_key_mods & GLUT_ACTIVE_ALT) ? ImGuiKeyModFlags_Alt : 0); |
| io.AddKeyModEvent(key_mods); |
| } |
| |
| static void ImGui_ImplGLUT_AddKeyEvent(ImGuiKey key, bool down, int native_keycode) |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| ImGuiIOKeyEvent io_event; |
| io_event.Key = key; |
| io_event.Down = down; |
| io_event.NativeKeycode = native_keycode; |
| io.AddKeyEvent(&io_event); |
| } |
| |
| 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_UpdateKeyboardMods(); |
| (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_UpdateKeyboardMods(); |
| (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_UpdateKeyboardMods(); |
| (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_UpdateKeyboardMods(); |
| (void)x; (void)y; // Unused |
| } |
| |
| void ImGui_ImplGLUT_MouseFunc(int glut_button, int state, int x, int y) |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| io.MousePos = ImVec2((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) |
| io.MouseDown[button] = true; |
| if (button != -1 && state == GLUT_UP) |
| io.MouseDown[button] = false; |
| } |
| |
| #ifdef __FREEGLUT_EXT_H__ |
| void ImGui_ImplGLUT_MouseWheelFunc(int button, int dir, int x, int y) |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| io.MousePos = ImVec2((float)x, (float)y); |
| if (dir > 0) |
| io.MouseWheel += 1.0; |
| else if (dir < 0) |
| io.MouseWheel -= 1.0; |
| (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.MousePos = ImVec2((float)x, (float)y); |
| } |
