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 GLUT/FreeGLUT IS OBSOLETE PREHISTORIC SOFTWARE.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