1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216
|
// dear imgui: Platform Binding for GLUT/FreeGLUT
// This needs to be used along with a Renderer (e.g. OpenGL2)
// !!! GLUT/FreeGLUT IS OBSOLETE SOFTWARE. Using GLUT is not recommended unless you really miss the 90's. !!!
// !!! If someone or something is teaching you GLUT in 2020, you are being abused. Please show some resistance. !!!
// !!! Nowadays, prefer using GLFW or SDL instead!
// 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 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)
// 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
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;
// 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_KeyPadEnter] = 13; // == CTRL+M
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_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 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_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);
// 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_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);
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_ImplGLUT_UpdateKeyboardMods();
(void)x; (void)y; // Unused
}
void ImGui_ImplGLUT_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_ImplGLUT_UpdateKeyboardMods();
(void)x; (void)y; // Unused
}
void ImGui_ImplGLUT_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_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);
}
|