383 lines
18 KiB
C++
383 lines
18 KiB
C++
// dear imgui: Platform Binding for GLFW
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// This needs to be used along with a Renderer (e.g. OpenGL3, Vulkan..)
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// (Info: GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
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// (Requires: GLFW 3.1+)
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// Implemented features:
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// [X] Platform: Clipboard support.
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// [X] Platform: Gamepad support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
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// [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange' (note: the resizing cursors requires GLFW 3.4+).
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// [X] Platform: Keyboard arrays indexed using GLFW_KEY_* codes, e.g. ImGui::IsKeyPressed(GLFW_KEY_SPACE).
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// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
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// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
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// https://github.com/ocornut/imgui
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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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// 2020-01-17: Inputs: Disable error callback while assigning mouse cursors because some X11 setup don't have them and it generates errors.
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// 2019-12-05: Inputs: Added support for new mouse cursors added in GLFW 3.4+ (resizing cursors, not allowed cursor).
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// 2019-10-18: Misc: Previously installed user callbacks are now restored on shutdown.
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// 2019-07-21: Inputs: Added mapping for ImGuiKey_KeyPadEnter.
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// 2019-05-11: Inputs: Don't filter value from character callback before calling AddInputCharacter().
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// 2019-03-12: Misc: Preserve DisplayFramebufferScale when main window is minimized.
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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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// 2018-11-07: Inputs: When installing our GLFW callbacks, we save user's previously installed ones - if any - and chain call them.
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// 2018-08-01: Inputs: Workaround for Emscripten which doesn't seem to handle focus related calls.
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// 2018-06-29: Inputs: Added support for the ImGuiMouseCursor_Hand cursor.
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// 2018-06-08: Misc: Extracted imgui_impl_glfw.cpp/.h away from the old combined GLFW+OpenGL/Vulkan examples.
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// 2018-03-20: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag.
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// 2018-02-20: Inputs: Added support for mouse cursors (ImGui::GetMouseCursor() value, passed to glfwSetCursor()).
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// 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
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// 2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
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// 2018-01-25: Inputs: Added gamepad support if ImGuiConfigFlags_NavEnableGamepad is set.
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// 2018-01-25: Inputs: Honoring the io.WantSetMousePos by repositioning the mouse (when using navigation and ImGuiConfigFlags_NavMoveMouse is set).
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// 2018-01-20: Inputs: Added Horizontal Mouse Wheel support.
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// 2018-01-18: Inputs: Added mapping for ImGuiKey_Insert.
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// 2017-08-25: Inputs: MousePos set to -FLT_MAX,-FLT_MAX when mouse is unavailable/missing (instead of -1,-1).
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// 2016-10-15: Misc: Added a void* user_data parameter to Clipboard function handlers.
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#include "imgui.h"
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#include "imgui_impl_glfw.h"
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#include "imgui_extra_keys.h"
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// GLFW
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#include <GLFW/glfw3.h>
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#ifdef _WIN32
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#undef APIENTRY
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#define GLFW_EXPOSE_NATIVE_WIN32
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#include <GLFW/glfw3native.h> // for glfwGetWin32Window
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#endif
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#define GLFW_HAS_WINDOW_TOPMOST (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3200) // 3.2+ GLFW_FLOATING
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#define GLFW_HAS_WINDOW_HOVERED (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3300) // 3.3+ GLFW_HOVERED
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#define GLFW_HAS_WINDOW_ALPHA (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3300) // 3.3+ glfwSetWindowOpacity
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#define GLFW_HAS_PER_MONITOR_DPI (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3300) // 3.3+ glfwGetMonitorContentScale
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#define GLFW_HAS_VULKAN (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3200) // 3.2+ glfwCreateWindowSurface
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#ifdef GLFW_RESIZE_NESW_CURSOR // let's be nice to people who pulled GLFW between 2019-04-16 (3.4 define) and 2019-11-29 (cursors defines) // FIXME: Remove when GLFW 3.4 is released?
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#define GLFW_HAS_NEW_CURSORS (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3400) // 3.4+ GLFW_RESIZE_ALL_CURSOR, GLFW_RESIZE_NESW_CURSOR, GLFW_RESIZE_NWSE_CURSOR, GLFW_NOT_ALLOWED_CURSOR
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#else
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#define GLFW_HAS_NEW_CURSORS (0)
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#endif
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// Data
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enum GlfwClientApi
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{
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GlfwClientApi_Unknown,
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GlfwClientApi_OpenGL,
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GlfwClientApi_Vulkan
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};
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static GLFWwindow* g_Window = NULL; // Main window
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static GlfwClientApi g_ClientApi = GlfwClientApi_Unknown;
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static double g_Time = 0.0;
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static bool g_MouseJustPressed[ImGuiMouseButton_COUNT] = {};
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static GLFWcursor* g_MouseCursors[ImGuiMouseCursor_COUNT] = {};
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static bool g_InstalledCallbacks = false;
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// Chain GLFW callbacks: our callbacks will call the user's previously installed callbacks, if any.
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static GLFWmousebuttonfun g_PrevUserCallbackMousebutton = NULL;
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static GLFWscrollfun g_PrevUserCallbackScroll = NULL;
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static GLFWkeyfun g_PrevUserCallbackKey = NULL;
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static GLFWcharfun g_PrevUserCallbackChar = NULL;
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static const char* ImGui_ImplGlfw_GetClipboardText(void* user_data)
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{
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return glfwGetClipboardString((GLFWwindow*)user_data);
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}
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static void ImGui_ImplGlfw_SetClipboardText(void* user_data, const char* text)
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{
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glfwSetClipboardString((GLFWwindow*)user_data, text);
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}
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void ImGui_ImplGlfw_MouseButtonCallback(GLFWwindow* window, int button, int action, int mods)
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{
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if (g_PrevUserCallbackMousebutton != NULL)
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g_PrevUserCallbackMousebutton(window, button, action, mods);
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if (action == GLFW_PRESS && button >= 0 && button < IM_ARRAYSIZE(g_MouseJustPressed))
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g_MouseJustPressed[button] = true;
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}
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void ImGui_ImplGlfw_ScrollCallback(GLFWwindow* window, double xoffset, double yoffset)
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{
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if (g_PrevUserCallbackScroll != NULL)
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g_PrevUserCallbackScroll(window, xoffset, yoffset);
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ImGuiIO& io = ImGui::GetIO();
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io.MouseWheelH += (float)xoffset;
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io.MouseWheel += (float)yoffset;
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}
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void ImGui_ImplGlfw_KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods)
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{
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if (g_PrevUserCallbackKey != NULL)
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g_PrevUserCallbackKey(window, key, scancode, action, mods);
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ImGuiIO& io = ImGui::GetIO();
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if (action == GLFW_PRESS)
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io.KeysDown[key] = true;
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if (action == GLFW_RELEASE)
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io.KeysDown[key] = false;
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// Modifiers are not reliable across systems
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io.KeyCtrl = io.KeysDown[GLFW_KEY_LEFT_CONTROL] || io.KeysDown[GLFW_KEY_RIGHT_CONTROL];
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io.KeyShift = io.KeysDown[GLFW_KEY_LEFT_SHIFT] || io.KeysDown[GLFW_KEY_RIGHT_SHIFT];
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io.KeyAlt = io.KeysDown[GLFW_KEY_LEFT_ALT] || io.KeysDown[GLFW_KEY_RIGHT_ALT];
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#ifdef _WIN32
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io.KeySuper = false;
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#else
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io.KeySuper = io.KeysDown[GLFW_KEY_LEFT_SUPER] || io.KeysDown[GLFW_KEY_RIGHT_SUPER];
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#endif
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}
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void ImGui_ImplGlfw_CharCallback(GLFWwindow* window, unsigned int c)
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{
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if (g_PrevUserCallbackChar != NULL)
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g_PrevUserCallbackChar(window, c);
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ImGuiIO& io = ImGui::GetIO();
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io.AddInputCharacter(c);
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}
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static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, GlfwClientApi client_api)
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{
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g_Window = window;
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g_Time = 0.0;
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// Setup back-end capabilities flags
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ImGuiIO& io = ImGui::GetIO();
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io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional)
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io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos; // We can honor io.WantSetMousePos requests (optional, rarely used)
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io.BackendPlatformName = "imgui_impl_glfw";
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// Keyboard mapping. ImGui will use those indices to peek into the io.KeysDown[] array.
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io.KeyMap[ImGuiKey_Tab] = GLFW_KEY_TAB;
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io.KeyMap[ImGuiKey_LeftArrow] = GLFW_KEY_LEFT;
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io.KeyMap[ImGuiKey_RightArrow] = GLFW_KEY_RIGHT;
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io.KeyMap[ImGuiKey_UpArrow] = GLFW_KEY_UP;
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io.KeyMap[ImGuiKey_DownArrow] = GLFW_KEY_DOWN;
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io.KeyMap[ImGuiKey_PageUp] = GLFW_KEY_PAGE_UP;
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io.KeyMap[ImGuiKey_PageDown] = GLFW_KEY_PAGE_DOWN;
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io.KeyMap[ImGuiKey_Home] = GLFW_KEY_HOME;
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io.KeyMap[ImGuiKey_End] = GLFW_KEY_END;
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io.KeyMap[ImGuiKey_Insert] = GLFW_KEY_INSERT;
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io.KeyMap[ImGuiKey_Delete] = GLFW_KEY_DELETE;
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io.KeyMap[ImGuiKey_Backspace] = GLFW_KEY_BACKSPACE;
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io.KeyMap[ImGuiKey_Space] = GLFW_KEY_SPACE;
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io.KeyMap[ImGuiKey_Enter] = GLFW_KEY_ENTER;
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io.KeyMap[ImGuiKey_Escape] = GLFW_KEY_ESCAPE;
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io.KeyMap[ImGuiKey_KeyPadEnter] = GLFW_KEY_KP_ENTER;
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io.KeyMap[ImGuiKey_A] = GLFW_KEY_A;
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io.KeyMap[ImGuiKey_C] = GLFW_KEY_C;
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io.KeyMap[ImGuiKey_V] = GLFW_KEY_V;
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io.KeyMap[ImGuiKey_X] = GLFW_KEY_X;
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io.KeyMap[ImGuiKey_Y] = GLFW_KEY_Y;
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io.KeyMap[ImGuiKey_Z] = GLFW_KEY_Z;
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int f_index = GetEnumValueForF();
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int d_index = GetEnumValueForD();
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if (f_index >= 0)
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io.KeyMap[f_index] = GLFW_KEY_F;
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if (d_index >= 0)
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io.KeyMap[d_index] = GLFW_KEY_D;
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io.SetClipboardTextFn = ImGui_ImplGlfw_SetClipboardText;
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io.GetClipboardTextFn = ImGui_ImplGlfw_GetClipboardText;
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io.ClipboardUserData = g_Window;
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#if defined(_WIN32)
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//io.ImeWindowHandle = (void*)glfwGetWin32Window(g_Window);
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#endif
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// Create mouse cursors
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// (By design, on X11 cursors are user configurable and some cursors may be missing. When a cursor doesn't exist,
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// GLFW will emit an error which will often be printed by the app, so we temporarily disable error reporting.
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// Missing cursors will return NULL and our _UpdateMouseCursor() function will use the Arrow cursor instead.)
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GLFWerrorfun prev_error_callback = glfwSetErrorCallback(NULL);
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g_MouseCursors[ImGuiMouseCursor_Arrow] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
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g_MouseCursors[ImGuiMouseCursor_TextInput] = glfwCreateStandardCursor(GLFW_IBEAM_CURSOR);
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g_MouseCursors[ImGuiMouseCursor_ResizeNS] = glfwCreateStandardCursor(GLFW_VRESIZE_CURSOR);
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g_MouseCursors[ImGuiMouseCursor_ResizeEW] = glfwCreateStandardCursor(GLFW_HRESIZE_CURSOR);
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g_MouseCursors[ImGuiMouseCursor_Hand] = glfwCreateStandardCursor(GLFW_HAND_CURSOR);
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#if GLFW_HAS_NEW_CURSORS
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g_MouseCursors[ImGuiMouseCursor_ResizeAll] = glfwCreateStandardCursor(GLFW_RESIZE_ALL_CURSOR);
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g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = glfwCreateStandardCursor(GLFW_RESIZE_NESW_CURSOR);
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g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = glfwCreateStandardCursor(GLFW_RESIZE_NWSE_CURSOR);
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g_MouseCursors[ImGuiMouseCursor_NotAllowed] = glfwCreateStandardCursor(GLFW_NOT_ALLOWED_CURSOR);
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#else
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g_MouseCursors[ImGuiMouseCursor_ResizeAll] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
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g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
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g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
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g_MouseCursors[ImGuiMouseCursor_NotAllowed] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
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#endif
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glfwSetErrorCallback(prev_error_callback);
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// Chain GLFW callbacks: our callbacks will call the user's previously installed callbacks, if any.
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g_PrevUserCallbackMousebutton = NULL;
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g_PrevUserCallbackScroll = NULL;
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g_PrevUserCallbackKey = NULL;
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g_PrevUserCallbackChar = NULL;
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if (install_callbacks)
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{
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g_InstalledCallbacks = true;
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g_PrevUserCallbackMousebutton = glfwSetMouseButtonCallback(window, ImGui_ImplGlfw_MouseButtonCallback);
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g_PrevUserCallbackScroll = glfwSetScrollCallback(window, ImGui_ImplGlfw_ScrollCallback);
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g_PrevUserCallbackKey = glfwSetKeyCallback(window, ImGui_ImplGlfw_KeyCallback);
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g_PrevUserCallbackChar = glfwSetCharCallback(window, ImGui_ImplGlfw_CharCallback);
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}
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g_ClientApi = client_api;
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return true;
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}
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bool ImGui_ImplGlfw_InitForNone(GLFWwindow* window, bool install_callbacks)
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{
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return ImGui_ImplGlfw_Init(window, install_callbacks, GlfwClientApi_Unknown);
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}
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bool ImGui_ImplGlfw_InitForOpenGL(GLFWwindow* window, bool install_callbacks)
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{
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return ImGui_ImplGlfw_Init(window, install_callbacks, GlfwClientApi_OpenGL);
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}
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bool ImGui_ImplGlfw_InitForVulkan(GLFWwindow* window, bool install_callbacks)
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{
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return ImGui_ImplGlfw_Init(window, install_callbacks, GlfwClientApi_Vulkan);
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}
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void ImGui_ImplGlfw_Shutdown()
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{
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if (g_InstalledCallbacks)
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{
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glfwSetMouseButtonCallback(g_Window, g_PrevUserCallbackMousebutton);
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glfwSetScrollCallback(g_Window, g_PrevUserCallbackScroll);
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glfwSetKeyCallback(g_Window, g_PrevUserCallbackKey);
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glfwSetCharCallback(g_Window, g_PrevUserCallbackChar);
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g_InstalledCallbacks = false;
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}
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for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
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{
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glfwDestroyCursor(g_MouseCursors[cursor_n]);
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g_MouseCursors[cursor_n] = NULL;
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}
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g_ClientApi = GlfwClientApi_Unknown;
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}
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static void ImGui_ImplGlfw_UpdateMousePosAndButtons()
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{
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// Update buttons
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ImGuiIO& io = ImGui::GetIO();
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for (int i = 0; i < IM_ARRAYSIZE(io.MouseDown); i++)
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{
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// If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
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io.MouseDown[i] = g_MouseJustPressed[i] || glfwGetMouseButton(g_Window, i) != 0;
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g_MouseJustPressed[i] = false;
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}
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// Update mouse position
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const ImVec2 mouse_pos_backup = io.MousePos;
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io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
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#ifdef __EMSCRIPTEN__
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const bool focused = true; // Emscripten
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#else
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const bool focused = glfwGetWindowAttrib(g_Window, GLFW_FOCUSED) != 0;
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#endif
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if (focused)
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{
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if (io.WantSetMousePos)
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{
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glfwSetCursorPos(g_Window, (double)mouse_pos_backup.x, (double)mouse_pos_backup.y);
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}
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else
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{
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double mouse_x, mouse_y;
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glfwGetCursorPos(g_Window, &mouse_x, &mouse_y);
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io.MousePos = ImVec2((float)mouse_x, (float)mouse_y);
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}
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}
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}
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static void ImGui_ImplGlfw_UpdateMouseCursor()
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{
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ImGuiIO& io = ImGui::GetIO();
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if ((io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange) || glfwGetInputMode(g_Window, GLFW_CURSOR) == GLFW_CURSOR_DISABLED)
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return;
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ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
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if (imgui_cursor == ImGuiMouseCursor_None || io.MouseDrawCursor)
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{
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// Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
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glfwSetInputMode(g_Window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
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}
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else
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{
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// Show OS mouse cursor
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// FIXME-PLATFORM: Unfocused windows seems to fail changing the mouse cursor with GLFW 3.2, but 3.3 works here.
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glfwSetCursor(g_Window, g_MouseCursors[imgui_cursor] ? g_MouseCursors[imgui_cursor] : g_MouseCursors[ImGuiMouseCursor_Arrow]);
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glfwSetInputMode(g_Window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
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}
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}
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static void ImGui_ImplGlfw_UpdateGamepads()
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{
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ImGuiIO& io = ImGui::GetIO();
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memset(io.NavInputs, 0, sizeof(io.NavInputs));
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if ((io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad) == 0)
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return;
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// Update gamepad inputs
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#define MAP_BUTTON(NAV_NO, BUTTON_NO) { if (buttons_count > BUTTON_NO && buttons[BUTTON_NO] == GLFW_PRESS) io.NavInputs[NAV_NO] = 1.0f; }
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#define MAP_ANALOG(NAV_NO, AXIS_NO, V0, V1) { float v = (axes_count > AXIS_NO) ? axes[AXIS_NO] : V0; v = (v - V0) / (V1 - V0); if (v > 1.0f) v = 1.0f; if (io.NavInputs[NAV_NO] < v) io.NavInputs[NAV_NO] = v; }
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int axes_count = 0, buttons_count = 0;
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const float* axes = glfwGetJoystickAxes(GLFW_JOYSTICK_1, &axes_count);
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const unsigned char* buttons = glfwGetJoystickButtons(GLFW_JOYSTICK_1, &buttons_count);
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MAP_BUTTON(ImGuiNavInput_Activate, 0); // Cross / A
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MAP_BUTTON(ImGuiNavInput_Cancel, 1); // Circle / B
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MAP_BUTTON(ImGuiNavInput_Menu, 2); // Square / X
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MAP_BUTTON(ImGuiNavInput_Input, 3); // Triangle / Y
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MAP_BUTTON(ImGuiNavInput_DpadLeft, 13); // D-Pad Left
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MAP_BUTTON(ImGuiNavInput_DpadRight, 11); // D-Pad Right
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MAP_BUTTON(ImGuiNavInput_DpadUp, 10); // D-Pad Up
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MAP_BUTTON(ImGuiNavInput_DpadDown, 12); // D-Pad Down
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MAP_BUTTON(ImGuiNavInput_FocusPrev, 4); // L1 / LB
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MAP_BUTTON(ImGuiNavInput_FocusNext, 5); // R1 / RB
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MAP_BUTTON(ImGuiNavInput_TweakSlow, 4); // L1 / LB
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MAP_BUTTON(ImGuiNavInput_TweakFast, 5); // R1 / RB
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MAP_ANALOG(ImGuiNavInput_LStickLeft, 0, -0.3f, -0.9f);
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MAP_ANALOG(ImGuiNavInput_LStickRight,0, +0.3f, +0.9f);
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MAP_ANALOG(ImGuiNavInput_LStickUp, 1, +0.3f, +0.9f);
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MAP_ANALOG(ImGuiNavInput_LStickDown, 1, -0.3f, -0.9f);
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#undef MAP_BUTTON
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#undef MAP_ANALOG
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if (axes_count > 0 && buttons_count > 0)
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io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
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else
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io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad;
|
|
}
|
|
|
|
void ImGui_ImplGlfw_NewFrame()
|
|
{
|
|
ImGuiIO& io = ImGui::GetIO();
|
|
IM_ASSERT(io.Fonts->IsBuilt() && "Font atlas not built! It is generally built by the renderer back-end. Missing call to renderer _NewFrame() function? e.g. ImGui_ImplOpenGL3_NewFrame().");
|
|
|
|
// Setup display size (every frame to accommodate for window resizing)
|
|
int w, h;
|
|
int display_w, display_h;
|
|
glfwGetWindowSize(g_Window, &w, &h);
|
|
glfwGetFramebufferSize(g_Window, &display_w, &display_h);
|
|
io.DisplaySize = ImVec2((float)w, (float)h);
|
|
if (w > 0 && h > 0)
|
|
io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h);
|
|
|
|
// Setup time step
|
|
double current_time = glfwGetTime();
|
|
io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f);
|
|
g_Time = current_time;
|
|
|
|
ImGui_ImplGlfw_UpdateMousePosAndButtons();
|
|
ImGui_ImplGlfw_UpdateMouseCursor();
|
|
|
|
// Update game controllers (if enabled and available)
|
|
ImGui_ImplGlfw_UpdateGamepads();
|
|
}
|