444 lines
22 KiB
C++
444 lines
22 KiB
C++
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// dear imgui: Platform Backend for SDL2
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// This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..)
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// (Info: SDL2 is a cross-platform general purpose library for handling windows, inputs, graphics context creation, etc.)
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// (Prefer SDL 2.0.5+ for full feature support.)
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// Implemented features:
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// [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
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// [X] Platform: Clipboard support.
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// [X] Platform: Keyboard arrays indexed using SDL_SCANCODE_* codes, e.g. ImGui::IsKeyPressed(SDL_SCANCODE_SPACE).
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// [X] Platform: Gamepad support. Enabled with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
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// Missing features:
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// [ ] Platform: SDL2 handling of IME under Windows appears to be broken and it explicitly disable the regular Windows IME. You can restore Windows IME by compiling SDL with SDL_DISABLE_WINDOWS_IME.
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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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// 2021-08-17: Calling io.AddFocusEvent() on SDL_WINDOWEVENT_FOCUS_GAINED/SDL_WINDOWEVENT_FOCUS_LOST.
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// 2021-07-29: Inputs: MousePos is correctly reported when the host platform window is hovered but not focused (using SDL_GetMouseFocus() + SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, requires SDL 2.0.5+)
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// 2021-06-29: *BREAKING CHANGE* Removed 'SDL_Window* window' parameter to ImGui_ImplSDL2_NewFrame() which was unnecessary.
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// 2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
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// 2021-03-22: Rework global mouse pos availability check listing supported platforms explicitly, effectively fixing mouse access on Raspberry Pi. (#2837, #3950)
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// 2020-05-25: Misc: Report a zero display-size when window is minimized, to be consistent with other backends.
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// 2020-02-20: Inputs: Fixed mapping for ImGuiKey_KeyPadEnter (using SDL_SCANCODE_KP_ENTER instead of SDL_SCANCODE_RETURN2).
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// 2019-12-17: Inputs: On Wayland, use SDL_GetMouseState (because there is no global mouse state).
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// 2019-12-05: Inputs: Added support for ImGuiMouseCursor_NotAllowed mouse cursor.
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// 2019-07-21: Inputs: Added mapping for ImGuiKey_KeyPadEnter.
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// 2019-04-23: Inputs: Added support for SDL_GameController (if ImGuiConfigFlags_NavEnableGamepad is set by user application).
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// 2019-03-12: Misc: Preserve DisplayFramebufferScale when main window is minimized.
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// 2018-12-21: Inputs: Workaround for Android/iOS which don't seem to handle focus related calls.
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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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// 2018-11-14: Changed the signature of ImGui_ImplSDL2_ProcessEvent() to take a 'const SDL_Event*'.
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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_sdl.cpp/.h away from the old combined SDL2+OpenGL/Vulkan examples.
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// 2018-06-08: Misc: ImGui_ImplSDL2_InitForOpenGL() now takes a SDL_GLContext parameter.
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// 2018-05-09: Misc: Fixed clipboard paste memory leak (we didn't call SDL_FreeMemory on the data returned by SDL_GetClipboardText).
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// 2018-03-20: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag.
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// 2018-02-16: Inputs: Added support for mouse cursors, honoring ImGui::GetMouseCursor() value.
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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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// 2018-02-05: Misc: Using SDL_GetPerformanceCounter() instead of SDL_GetTicks() to be able to handle very high framerate (1000+ FPS).
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// 2018-02-05: Inputs: Keyboard mapping is using scancodes everywhere instead of a confusing mixture of keycodes and scancodes.
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// 2018-01-20: Inputs: Added Horizontal Mouse Wheel support.
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// 2018-01-19: Inputs: When available (SDL 2.0.4+) using SDL_CaptureMouse() to retrieve coordinates outside of client area when dragging. Otherwise (SDL 2.0.3 and before) testing for SDL_WINDOW_INPUT_FOCUS instead of SDL_WINDOW_MOUSE_FOCUS.
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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_sdl.h"
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// SDL
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#include <SDL.h>
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#include <SDL_syswm.h>
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#if defined(__APPLE__)
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#include <TargetConditionals.h>
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#endif
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#if SDL_VERSION_ATLEAST(2,0,4) && !defined(__EMSCRIPTEN__) && !defined(__ANDROID__) && !(defined(__APPLE__) && TARGET_OS_IOS)
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#define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE 1
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#else
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#define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE 0
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#endif
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#define SDL_HAS_MOUSE_FOCUS_CLICKTHROUGH SDL_VERSION_ATLEAST(2,0,5)
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#define SDL_HAS_VULKAN SDL_VERSION_ATLEAST(2,0,6)
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// SDL Data
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struct ImGui_ImplSDL2_Data
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{
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SDL_Window* Window;
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Uint64 Time;
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bool MousePressed[3];
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SDL_Cursor* MouseCursors[ImGuiMouseCursor_COUNT];
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char* ClipboardTextData;
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bool MouseCanUseGlobalState;
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ImGui_ImplSDL2_Data() { memset(this, 0, sizeof(*this)); }
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};
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// Backend data stored in io.BackendPlatformUserData to allow support for multiple Dear ImGui contexts
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// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
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// FIXME: multi-context support is not well tested and probably dysfunctional in this backend.
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// FIXME: some shared resources (mouse cursor shape, gamepad) are mishandled when using multi-context.
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static ImGui_ImplSDL2_Data* ImGui_ImplSDL2_GetBackendData()
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{
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return ImGui::GetCurrentContext() ? (ImGui_ImplSDL2_Data*)ImGui::GetIO().BackendPlatformUserData : NULL;
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}
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// Functions
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static const char* ImGui_ImplSDL2_GetClipboardText(void*)
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{
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ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
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if (bd->ClipboardTextData)
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SDL_free(bd->ClipboardTextData);
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bd->ClipboardTextData = SDL_GetClipboardText();
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return bd->ClipboardTextData;
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}
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static void ImGui_ImplSDL2_SetClipboardText(void*, const char* text)
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{
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SDL_SetClipboardText(text);
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}
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// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
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// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
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// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
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// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
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// If you have multiple SDL events and some of them are not meant to be used by dear imgui, you may need to filter events based on their windowID field.
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bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
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{
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ImGuiIO& io = ImGui::GetIO();
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ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
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switch (event->type)
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{
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case SDL_MOUSEWHEEL:
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{
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if (event->wheel.x > 0) io.MouseWheelH += 1;
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if (event->wheel.x < 0) io.MouseWheelH -= 1;
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if (event->wheel.y > 0) io.MouseWheel += 1;
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if (event->wheel.y < 0) io.MouseWheel -= 1;
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return true;
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}
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case SDL_MOUSEBUTTONDOWN:
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{
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if (event->button.button == SDL_BUTTON_LEFT) { bd->MousePressed[0] = true; }
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if (event->button.button == SDL_BUTTON_RIGHT) { bd->MousePressed[1] = true; }
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if (event->button.button == SDL_BUTTON_MIDDLE) { bd->MousePressed[2] = true; }
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return true;
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}
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case SDL_TEXTINPUT:
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{
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io.AddInputCharactersUTF8(event->text.text);
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return true;
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}
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case SDL_KEYDOWN:
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case SDL_KEYUP:
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{
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int key = event->key.keysym.scancode;
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IM_ASSERT(key >= 0 && key < IM_ARRAYSIZE(io.KeysDown));
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io.KeysDown[key] = (event->type == SDL_KEYDOWN);
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io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0);
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io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0);
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io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0);
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#ifdef _WIN32
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io.KeySuper = false;
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#else
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io.KeySuper = ((SDL_GetModState() & KMOD_GUI) != 0);
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#endif
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return true;
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}
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case SDL_WINDOWEVENT:
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{
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if (event->window.event == SDL_WINDOWEVENT_FOCUS_GAINED)
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io.AddFocusEvent(true);
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else if (event->window.event == SDL_WINDOWEVENT_FOCUS_LOST)
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io.AddFocusEvent(false);
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return true;
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}
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}
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return false;
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}
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static bool ImGui_ImplSDL2_Init(SDL_Window* window)
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{
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ImGuiIO& io = ImGui::GetIO();
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IM_ASSERT(io.BackendPlatformUserData == NULL && "Already initialized a platform backend!");
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// Check and store if we are on a SDL backend that supports global mouse position
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// ("wayland" and "rpi" don't support it, but we chose to use a white-list instead of a black-list)
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bool mouse_can_use_global_state = false;
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#if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE
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const char* sdl_backend = SDL_GetCurrentVideoDriver();
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const char* global_mouse_whitelist[] = { "windows", "cocoa", "x11", "DIVE", "VMAN" };
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for (int n = 0; n < IM_ARRAYSIZE(global_mouse_whitelist); n++)
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if (strncmp(sdl_backend, global_mouse_whitelist[n], strlen(global_mouse_whitelist[n])) == 0)
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mouse_can_use_global_state = true;
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#endif
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// Setup backend capabilities flags
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ImGui_ImplSDL2_Data* bd = IM_NEW(ImGui_ImplSDL2_Data)();
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io.BackendPlatformUserData = (void*)bd;
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io.BackendPlatformName = "imgui_impl_sdl";
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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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bd->Window = window;
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bd->MouseCanUseGlobalState = mouse_can_use_global_state;
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// Keyboard mapping. Dear ImGui will use those indices to peek into the io.KeysDown[] array.
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io.KeyMap[ImGuiKey_Tab] = SDL_SCANCODE_TAB;
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io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT;
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io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT;
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io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP;
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io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN;
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io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP;
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io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN;
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io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME;
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io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END;
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io.KeyMap[ImGuiKey_Insert] = SDL_SCANCODE_INSERT;
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io.KeyMap[ImGuiKey_Delete] = SDL_SCANCODE_DELETE;
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io.KeyMap[ImGuiKey_Backspace] = SDL_SCANCODE_BACKSPACE;
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io.KeyMap[ImGuiKey_Space] = SDL_SCANCODE_SPACE;
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io.KeyMap[ImGuiKey_Enter] = SDL_SCANCODE_RETURN;
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io.KeyMap[ImGuiKey_Escape] = SDL_SCANCODE_ESCAPE;
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io.KeyMap[ImGuiKey_KeyPadEnter] = SDL_SCANCODE_KP_ENTER;
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io.KeyMap[ImGuiKey_A] = SDL_SCANCODE_A;
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io.KeyMap[ImGuiKey_C] = SDL_SCANCODE_C;
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io.KeyMap[ImGuiKey_V] = SDL_SCANCODE_V;
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io.KeyMap[ImGuiKey_X] = SDL_SCANCODE_X;
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io.KeyMap[ImGuiKey_Y] = SDL_SCANCODE_Y;
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io.KeyMap[ImGuiKey_Z] = SDL_SCANCODE_Z;
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io.SetClipboardTextFn = ImGui_ImplSDL2_SetClipboardText;
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io.GetClipboardTextFn = ImGui_ImplSDL2_GetClipboardText;
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io.ClipboardUserData = NULL;
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// Load mouse cursors
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bd->MouseCursors[ImGuiMouseCursor_Arrow] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW);
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bd->MouseCursors[ImGuiMouseCursor_TextInput] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_IBEAM);
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bd->MouseCursors[ImGuiMouseCursor_ResizeAll] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEALL);
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bd->MouseCursors[ImGuiMouseCursor_ResizeNS] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENS);
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bd->MouseCursors[ImGuiMouseCursor_ResizeEW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEWE);
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bd->MouseCursors[ImGuiMouseCursor_ResizeNESW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENESW);
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bd->MouseCursors[ImGuiMouseCursor_ResizeNWSE] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENWSE);
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bd->MouseCursors[ImGuiMouseCursor_Hand] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_HAND);
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bd->MouseCursors[ImGuiMouseCursor_NotAllowed] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_NO);
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#ifdef _WIN32
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SDL_SysWMinfo info;
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SDL_VERSION(&info.version);
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if (SDL_GetWindowWMInfo(window, &info))
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io.ImeWindowHandle = info.info.win.window;
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#else
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(void)window;
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#endif
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// Set SDL hint to receive mouse click events on window focus, otherwise SDL doesn't emit the event.
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// Without this, when clicking to gain focus, our widgets wouldn't activate even though they showed as hovered.
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// (This is unfortunately a global SDL setting, so enabling it might have a side-effect on your application.
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// It is unlikely to make a difference, but if your app absolutely needs to ignore the initial on-focus click:
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// you can ignore SDL_MOUSEBUTTONDOWN events coming right after a SDL_WINDOWEVENT_FOCUS_GAINED)
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#if SDL_HAS_MOUSE_FOCUS_CLICKTHROUGH
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SDL_SetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, "1");
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#endif
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return true;
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}
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bool ImGui_ImplSDL2_InitForOpenGL(SDL_Window* window, void* sdl_gl_context)
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{
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IM_UNUSED(sdl_gl_context); // Viewport branch will need this.
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return ImGui_ImplSDL2_Init(window);
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}
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bool ImGui_ImplSDL2_InitForVulkan(SDL_Window* window)
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{
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#if !SDL_HAS_VULKAN
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IM_ASSERT(0 && "Unsupported");
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#endif
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return ImGui_ImplSDL2_Init(window);
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}
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bool ImGui_ImplSDL2_InitForD3D(SDL_Window* window)
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{
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#if !defined(_WIN32)
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IM_ASSERT(0 && "Unsupported");
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#endif
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return ImGui_ImplSDL2_Init(window);
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}
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bool ImGui_ImplSDL2_InitForMetal(SDL_Window* window)
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{
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return ImGui_ImplSDL2_Init(window);
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}
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void ImGui_ImplSDL2_Shutdown()
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{
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ImGuiIO& io = ImGui::GetIO();
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ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
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if (bd->ClipboardTextData)
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SDL_free(bd->ClipboardTextData);
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for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
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SDL_FreeCursor(bd->MouseCursors[cursor_n]);
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io.BackendPlatformName = NULL;
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io.BackendPlatformUserData = NULL;
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IM_DELETE(bd);
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}
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static void ImGui_ImplSDL2_UpdateMousePosAndButtons()
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{
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ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
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ImGuiIO& io = ImGui::GetIO();
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ImVec2 mouse_pos_prev = io.MousePos;
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io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
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// Update mouse buttons
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int mouse_x_local, mouse_y_local;
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Uint32 mouse_buttons = SDL_GetMouseState(&mouse_x_local, &mouse_y_local);
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io.MouseDown[0] = bd->MousePressed[0] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // 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[1] = bd->MousePressed[1] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0;
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io.MouseDown[2] = bd->MousePressed[2] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
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bd->MousePressed[0] = bd->MousePressed[1] = bd->MousePressed[2] = false;
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// Obtain focused and hovered window. We forward mouse input when focused or when hovered (and no other window is capturing)
|
||
|
#if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE
|
||
|
SDL_Window* focused_window = SDL_GetKeyboardFocus();
|
||
|
SDL_Window* hovered_window = SDL_HAS_MOUSE_FOCUS_CLICKTHROUGH ? SDL_GetMouseFocus() : NULL; // This is better but is only reliably useful with SDL 2.0.5+ and SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH.
|
||
|
SDL_Window* mouse_window = NULL;
|
||
|
if (hovered_window && bd->Window == hovered_window)
|
||
|
mouse_window = hovered_window;
|
||
|
else if (focused_window && bd->Window == focused_window)
|
||
|
mouse_window = focused_window;
|
||
|
|
||
|
// SDL_CaptureMouse() let the OS know e.g. that our imgui drag outside the SDL window boundaries shouldn't e.g. trigger other operations outside
|
||
|
SDL_CaptureMouse(ImGui::IsAnyMouseDown() ? SDL_TRUE : SDL_FALSE);
|
||
|
#else
|
||
|
// SDL 2.0.3 and non-windowed systems: single-viewport only
|
||
|
SDL_Window* mouse_window = (SDL_GetWindowFlags(bd->Window) & SDL_WINDOW_INPUT_FOCUS) ? bd->Window : NULL;
|
||
|
#endif
|
||
|
|
||
|
if (mouse_window == NULL)
|
||
|
return;
|
||
|
|
||
|
// Set OS mouse position from Dear ImGui if requested (rarely used, only when ImGuiConfigFlags_NavEnableSetMousePos is enabled by user)
|
||
|
if (io.WantSetMousePos)
|
||
|
SDL_WarpMouseInWindow(bd->Window, (int)mouse_pos_prev.x, (int)mouse_pos_prev.y);
|
||
|
|
||
|
// Set Dear ImGui mouse position from OS position + get buttons. (this is the common behavior)
|
||
|
if (bd->MouseCanUseGlobalState)
|
||
|
{
|
||
|
// Single-viewport mode: mouse position in client window coordinates (io.MousePos is (0,0) when the mouse is on the upper-left corner of the app window)
|
||
|
// Unlike local position obtained earlier this will be valid when straying out of bounds.
|
||
|
int mouse_x_global, mouse_y_global;
|
||
|
SDL_GetGlobalMouseState(&mouse_x_global, &mouse_y_global);
|
||
|
int window_x, window_y;
|
||
|
SDL_GetWindowPosition(mouse_window, &window_x, &window_y);
|
||
|
io.MousePos = ImVec2((float)(mouse_x_global - window_x), (float)(mouse_y_global - window_y));
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
io.MousePos = ImVec2((float)mouse_x_local, (float)mouse_y_local);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void ImGui_ImplSDL2_UpdateMouseCursor()
|
||
|
{
|
||
|
ImGuiIO& io = ImGui::GetIO();
|
||
|
if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)
|
||
|
return;
|
||
|
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
|
||
|
|
||
|
ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
|
||
|
if (io.MouseDrawCursor || imgui_cursor == ImGuiMouseCursor_None)
|
||
|
{
|
||
|
// Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
|
||
|
SDL_ShowCursor(SDL_FALSE);
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
// Show OS mouse cursor
|
||
|
SDL_SetCursor(bd->MouseCursors[imgui_cursor] ? bd->MouseCursors[imgui_cursor] : bd->MouseCursors[ImGuiMouseCursor_Arrow]);
|
||
|
SDL_ShowCursor(SDL_TRUE);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void ImGui_ImplSDL2_UpdateGamepads()
|
||
|
{
|
||
|
ImGuiIO& io = ImGui::GetIO();
|
||
|
memset(io.NavInputs, 0, sizeof(io.NavInputs));
|
||
|
if ((io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad) == 0)
|
||
|
return;
|
||
|
|
||
|
// Get gamepad
|
||
|
SDL_GameController* game_controller = SDL_GameControllerOpen(0);
|
||
|
if (!game_controller)
|
||
|
{
|
||
|
io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad;
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
// Update gamepad inputs
|
||
|
#define MAP_BUTTON(NAV_NO, BUTTON_NO) { io.NavInputs[NAV_NO] = (SDL_GameControllerGetButton(game_controller, BUTTON_NO) != 0) ? 1.0f : 0.0f; }
|
||
|
#define MAP_ANALOG(NAV_NO, AXIS_NO, V0, V1) { float vn = (float)(SDL_GameControllerGetAxis(game_controller, AXIS_NO) - V0) / (float)(V1 - V0); if (vn > 1.0f) vn = 1.0f; if (vn > 0.0f && io.NavInputs[NAV_NO] < vn) io.NavInputs[NAV_NO] = vn; }
|
||
|
const int thumb_dead_zone = 8000; // SDL_gamecontroller.h suggests using this value.
|
||
|
MAP_BUTTON(ImGuiNavInput_Activate, SDL_CONTROLLER_BUTTON_A); // Cross / A
|
||
|
MAP_BUTTON(ImGuiNavInput_Cancel, SDL_CONTROLLER_BUTTON_B); // Circle / B
|
||
|
MAP_BUTTON(ImGuiNavInput_Menu, SDL_CONTROLLER_BUTTON_X); // Square / X
|
||
|
MAP_BUTTON(ImGuiNavInput_Input, SDL_CONTROLLER_BUTTON_Y); // Triangle / Y
|
||
|
MAP_BUTTON(ImGuiNavInput_DpadLeft, SDL_CONTROLLER_BUTTON_DPAD_LEFT); // D-Pad Left
|
||
|
MAP_BUTTON(ImGuiNavInput_DpadRight, SDL_CONTROLLER_BUTTON_DPAD_RIGHT); // D-Pad Right
|
||
|
MAP_BUTTON(ImGuiNavInput_DpadUp, SDL_CONTROLLER_BUTTON_DPAD_UP); // D-Pad Up
|
||
|
MAP_BUTTON(ImGuiNavInput_DpadDown, SDL_CONTROLLER_BUTTON_DPAD_DOWN); // D-Pad Down
|
||
|
MAP_BUTTON(ImGuiNavInput_FocusPrev, SDL_CONTROLLER_BUTTON_LEFTSHOULDER); // L1 / LB
|
||
|
MAP_BUTTON(ImGuiNavInput_FocusNext, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER); // R1 / RB
|
||
|
MAP_BUTTON(ImGuiNavInput_TweakSlow, SDL_CONTROLLER_BUTTON_LEFTSHOULDER); // L1 / LB
|
||
|
MAP_BUTTON(ImGuiNavInput_TweakFast, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER); // R1 / RB
|
||
|
MAP_ANALOG(ImGuiNavInput_LStickLeft, SDL_CONTROLLER_AXIS_LEFTX, -thumb_dead_zone, -32768);
|
||
|
MAP_ANALOG(ImGuiNavInput_LStickRight, SDL_CONTROLLER_AXIS_LEFTX, +thumb_dead_zone, +32767);
|
||
|
MAP_ANALOG(ImGuiNavInput_LStickUp, SDL_CONTROLLER_AXIS_LEFTY, -thumb_dead_zone, -32767);
|
||
|
MAP_ANALOG(ImGuiNavInput_LStickDown, SDL_CONTROLLER_AXIS_LEFTY, +thumb_dead_zone, +32767);
|
||
|
|
||
|
io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
|
||
|
#undef MAP_BUTTON
|
||
|
#undef MAP_ANALOG
|
||
|
}
|
||
|
|
||
|
void ImGui_ImplSDL2_NewFrame()
|
||
|
{
|
||
|
ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
|
||
|
IM_ASSERT(bd != NULL && "Did you call ImGui_ImplSDL2_Init()?");
|
||
|
ImGuiIO& io = ImGui::GetIO();
|
||
|
|
||
|
// Setup display size (every frame to accommodate for window resizing)
|
||
|
int w, h;
|
||
|
int display_w, display_h;
|
||
|
SDL_GetWindowSize(bd->Window, &w, &h);
|
||
|
if (SDL_GetWindowFlags(bd->Window) & SDL_WINDOW_MINIMIZED)
|
||
|
w = h = 0;
|
||
|
SDL_GL_GetDrawableSize(bd->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 (we don't use SDL_GetTicks() because it is using millisecond resolution)
|
||
|
static Uint64 frequency = SDL_GetPerformanceFrequency();
|
||
|
Uint64 current_time = SDL_GetPerformanceCounter();
|
||
|
io.DeltaTime = bd->Time > 0 ? (float)((double)(current_time - bd->Time) / frequency) : (float)(1.0f / 60.0f);
|
||
|
bd->Time = current_time;
|
||
|
|
||
|
ImGui_ImplSDL2_UpdateMousePosAndButtons();
|
||
|
ImGui_ImplSDL2_UpdateMouseCursor();
|
||
|
|
||
|
// Update game controllers (if enabled and available)
|
||
|
ImGui_ImplSDL2_UpdateGamepads();
|
||
|
}
|