| // ImGui Platform Binding for: FreeGLUT |
| // This needs to be used along with a Renderer (e.g. OpenGL2) |
| |
| // Issues: |
| // [ ] Platform: GLUT is unable to distinguish e.g. Backspace from CTRL+H or TAB from CTRL+I |
| |
| // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this. |
| // If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp. |
| // https://github.com/ocornut/imgui |
| |
| // CHANGELOG |
| // (minor and older changes stripped away, please see git history for details) |
| // 2018-03-22: Added FreeGLUT Platform binding. |
| |
| #include "imgui.h" |
| #include "imgui_impl_freeglut.h" |
| #include <GL/freeglut.h> |
| |
| #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 |
| |
| bool ImGui_ImplFreeGLUT_Init() |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| g_Time = 0; |
| |
| // Glut has 1 function for characters and one for "special keys". We map the characters in the 0..255 range and the keys above. |
| io.KeyMap[ImGuiKey_Tab] = '\t'; // == 9 == CTRL+I |
| io.KeyMap[ImGuiKey_LeftArrow] = 256 + GLUT_KEY_LEFT; |
| io.KeyMap[ImGuiKey_RightArrow] = 256 + GLUT_KEY_RIGHT; |
| io.KeyMap[ImGuiKey_UpArrow] = 256 + GLUT_KEY_UP; |
| io.KeyMap[ImGuiKey_DownArrow] = 256 + GLUT_KEY_DOWN; |
| io.KeyMap[ImGuiKey_PageUp] = 256 + GLUT_KEY_PAGE_UP; |
| io.KeyMap[ImGuiKey_PageDown] = 256 + GLUT_KEY_PAGE_DOWN; |
| io.KeyMap[ImGuiKey_Home] = 256 + GLUT_KEY_HOME; |
| io.KeyMap[ImGuiKey_End] = 256 + GLUT_KEY_END; |
| io.KeyMap[ImGuiKey_Insert] = 256 + GLUT_KEY_INSERT; |
| io.KeyMap[ImGuiKey_Delete] = 127; |
| io.KeyMap[ImGuiKey_Backspace] = 8; // == CTRL+H |
| io.KeyMap[ImGuiKey_Space] = ' '; |
| io.KeyMap[ImGuiKey_Enter] = 13; // == CTRL+M |
| io.KeyMap[ImGuiKey_Escape] = 27; |
| io.KeyMap[ImGuiKey_A] = 'A'; |
| io.KeyMap[ImGuiKey_C] = 'C'; |
| io.KeyMap[ImGuiKey_V] = 'V'; |
| io.KeyMap[ImGuiKey_X] = 'X'; |
| io.KeyMap[ImGuiKey_Y] = 'Y'; |
| io.KeyMap[ImGuiKey_Z] = 'Z'; |
| |
| return true; |
| } |
| |
| void ImGui_ImplFreeGLUT_InstallFuncs() |
| { |
| glutReshapeFunc(ImGui_ImplFreeGLUT_ReshapeFunc); |
| glutMotionFunc(ImGui_ImplFreeGLUT_MotionFunc); |
| glutPassiveMotionFunc(ImGui_ImplFreeGLUT_MotionFunc); |
| glutMouseFunc(ImGui_ImplFreeGLUT_MouseFunc); |
| glutMouseWheelFunc(ImGui_ImplFreeGLUT_MouseWheelFunc); |
| glutKeyboardFunc(ImGui_ImplFreeGLUT_KeyboardFunc); |
| glutKeyboardUpFunc(ImGui_ImplFreeGLUT_KeyboardUpFunc); |
| glutSpecialFunc(ImGui_ImplFreeGLUT_SpecialFunc); |
| glutSpecialUpFunc(ImGui_ImplFreeGLUT_SpecialUpFunc); |
| } |
| |
| void ImGui_ImplFreeGLUT_Shutdown() |
| { |
| } |
| |
| void ImGui_ImplFreeGLUT_NewFrame() |
| { |
| // Setup time step |
| ImGuiIO& io = ImGui::GetIO(); |
| int current_time = glutGet(GLUT_ELAPSED_TIME); |
| io.DeltaTime = (current_time - g_Time) / 1000.0f; |
| g_Time = current_time; |
| |
| // Start the frame |
| ImGui::NewFrame(); |
| } |
| |
| static void ImGui_ImplFreeGLUT_UpdateKeyboardMods() |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| int mods = glutGetModifiers(); |
| io.KeyCtrl = (mods & GLUT_ACTIVE_CTRL) != 0; |
| io.KeyShift = (mods & GLUT_ACTIVE_SHIFT) != 0; |
| io.KeyAlt = (mods & GLUT_ACTIVE_ALT) != 0; |
| } |
| |
| void ImGui_ImplFreeGLUT_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(c); |
| |
| // Store letters in KeysDown[] array as both uppercase and lowercase + Handle GLUT translating CTRL+A..CTRL+Z as 1..26. |
| // This is a hacky mess but GLUT is unable to distinguish e.g. a TAB key from CTRL+I so this is probably the best we can do here. |
| if (c >= 1 && c <= 26) |
| io.KeysDown[c] = io.KeysDown[c - 1 + 'a'] = io.KeysDown[c - 1 + 'A'] = true; |
| else if (c >= 'a' && c <= 'z') |
| io.KeysDown[c] = io.KeysDown[c - 'a' + 'A'] = true; |
| else if (c >= 'A' && c <= 'Z') |
| io.KeysDown[c] = io.KeysDown[c - 'A' + 'a'] = true; |
| else |
| io.KeysDown[c] = true; |
| ImGui_ImplFreeGLUT_UpdateKeyboardMods(); |
| (void)x; (void)y; // Unused |
| } |
| |
| void ImGui_ImplFreeGLUT_KeyboardUpFunc(unsigned char c, int x, int y) |
| { |
| //printf("char_up_func %d '%c'\n", c, c); |
| ImGuiIO& io = ImGui::GetIO(); |
| if (c >= 1 && c <= 26) |
| io.KeysDown[c] = io.KeysDown[c - 1 + 'a'] = io.KeysDown[c - 1 + 'A'] = false; |
| else if (c >= 'a' && c <= 'z') |
| io.KeysDown[c] = io.KeysDown[c - 'a' + 'A'] = false; |
| else if (c >= 'A' && c <= 'Z') |
| io.KeysDown[c] = io.KeysDown[c - 'A' + 'a'] = false; |
| else |
| io.KeysDown[c] = false; |
| ImGui_ImplFreeGLUT_UpdateKeyboardMods(); |
| (void)x; (void)y; // Unused |
| } |
| |
| void ImGui_ImplFreeGLUT_SpecialFunc(int key, int x, int y) |
| { |
| //printf("key_down_func %d\n", key); |
| ImGuiIO& io = ImGui::GetIO(); |
| if (key + 256 < IM_ARRAYSIZE(io.KeysDown)) |
| io.KeysDown[key + 256] = true; |
| ImGui_ImplFreeGLUT_UpdateKeyboardMods(); |
| (void)x; (void)y; // Unused |
| } |
| |
| void ImGui_ImplFreeGLUT_SpecialUpFunc(int key, int x, int y) |
| { |
| //printf("key_up_func %d\n", key); |
| ImGuiIO& io = ImGui::GetIO(); |
| if (key + 256 < IM_ARRAYSIZE(io.KeysDown)) |
| io.KeysDown[key + 256] = false; |
| ImGui_ImplFreeGLUT_UpdateKeyboardMods(); |
| (void)x; (void)y; // Unused |
| } |
| |
| void ImGui_ImplFreeGLUT_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; |
| } |
| |
| void ImGui_ImplFreeGLUT_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 |
| } |
| |
| void ImGui_ImplFreeGLUT_ReshapeFunc(int w, int h) |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| io.DisplaySize = ImVec2((float)w, (float)h); |
| } |
| |
| void ImGui_ImplFreeGLUT_MotionFunc(int x, int y) |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| io.MousePos = ImVec2((float)x, (float)y); |
| } |