blame: source/code/Libs/imgui/imgui.h

// dear imgui, v1.91.4

// (headers)

// Help:

// - See links below.

// - Call and read ImGui::ShowDemoWindow() in imgui_demo.cpp. All applications in examples/ are doing that.

// - Read top of imgui.cpp for more details, links and comments.

// - Add '#define IMGUI_DEFINE_MATH_OPERATORS' before including this file (or in imconfig.h) to access courtesy maths operators for ImVec2 and ImVec4.

// Resources:

// - FAQ ........................ https://dearimgui.com/faq (in repository as docs/FAQ.md)

// - Homepage ................... https://github.com/ocornut/imgui

// - Releases & changelog ....... https://github.com/ocornut/imgui/releases

// - Gallery .................... https://github.com/ocornut/imgui/issues?q=label%3Agallery (please post your screenshots/video there!)

// - Wiki ....................... https://github.com/ocornut/imgui/wiki (lots of good stuff there)

//   - Getting Started            https://github.com/ocornut/imgui/wiki/Getting-Started (how to integrate in an existing app by adding ~25 lines of code)

//   - Third-party Extensions     https://github.com/ocornut/imgui/wiki/Useful-Extensions (ImPlot & many more)

//   - Bindings/Backends          https://github.com/ocornut/imgui/wiki/Bindings (language bindings, backends for various tech/engines)

//   - Glossary                   https://github.com/ocornut/imgui/wiki/Glossary

//   - Debug Tools                https://github.com/ocornut/imgui/wiki/Debug-Tools

//   - Software using Dear ImGui  https://github.com/ocornut/imgui/wiki/Software-using-dear-imgui

// - Issues & support ........... https://github.com/ocornut/imgui/issues

// - Test Engine & Automation ... https://github.com/ocornut/imgui_test_engine (test suite, test engine to automate your apps)

// For first-time users having issues compiling/linking/running/loading fonts:

// please post in https://github.com/ocornut/imgui/discussions if you cannot find a solution in resources above.

// Everything else should be asked in 'Issues'! We are building a database of cross-linked knowledge there.

// Library Version

// (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM >= 12345')

#define IMGUI_VERSION       "1.91.4"

#define IMGUI_VERSION_NUM   19140

#define IMGUI_HAS_TABLE

#define IMGUI_HAS_VIEWPORT          // Viewport WIP branch

#define IMGUI_HAS_DOCK              // Docking WIP branch

/*

Index of this file:

// [SECTION] Header mess

// [SECTION] Forward declarations and basic types

// [SECTION] Dear ImGui end-user API functions

// [SECTION] Flags & Enumerations

// [SECTION] Tables API flags and structures (ImGuiTableFlags, ImGuiTableColumnFlags, ImGuiTableRowFlags, ImGuiTableBgTarget, ImGuiTableSortSpecs, ImGuiTableColumnSortSpecs)

// [SECTION] Helpers: Debug log, Memory allocations macros, ImVector<>

// [SECTION] ImGuiStyle

// [SECTION] ImGuiIO

// [SECTION] Misc data structures (ImGuiInputTextCallbackData, ImGuiSizeCallbackData, ImGuiWindowClass, ImGuiPayload)

// [SECTION] Helpers (ImGuiOnceUponAFrame, ImGuiTextFilter, ImGuiTextBuffer, ImGuiStorage, ImGuiListClipper, Math Operators, ImColor)

// [SECTION] Multi-Select API flags and structures (ImGuiMultiSelectFlags, ImGuiMultiSelectIO, ImGuiSelectionRequest, ImGuiSelectionBasicStorage, ImGuiSelectionExternalStorage)

// [SECTION] Drawing API (ImDrawCallback, ImDrawCmd, ImDrawIdx, ImDrawVert, ImDrawChannel, ImDrawListSplitter, ImDrawFlags, ImDrawListFlags, ImDrawList, ImDrawData)

// [SECTION] Font API (ImFontConfig, ImFontGlyph, ImFontGlyphRangesBuilder, ImFontAtlasFlags, ImFontAtlas, ImFont)

// [SECTION] Viewports (ImGuiViewportFlags, ImGuiViewport)

// [SECTION] ImGuiPlatformIO + other Platform Dependent Interfaces (ImGuiPlatformMonitor, ImGuiPlatformImeData)

// [SECTION] Obsolete functions and types

*/

#pragma once

// Configuration file with compile-time options

// (edit imconfig.h or '#define IMGUI_USER_CONFIG "myfilename.h" from your build system)

#ifdef IMGUI_USER_CONFIG

#include IMGUI_USER_CONFIG

#endif

#include "imconfig.h"

#ifndef IMGUI_DISABLE

//-----------------------------------------------------------------------------

// [SECTION] Header mess

//-----------------------------------------------------------------------------

// Includes

#include <float.h>                  // FLT_MIN, FLT_MAX

#include <stdarg.h>                 // va_list, va_start, va_end

#include <stddef.h>                 // ptrdiff_t, NULL

#include <string.h>                 // memset, memmove, memcpy, strlen, strchr, strcpy, strcmp

// Define attributes of all API symbols declarations (e.g. for DLL under Windows)

// IMGUI_API is used for core imgui functions, IMGUI_IMPL_API is used for the default backends files (imgui_impl_xxx.h)

// Using dear imgui via a shared library is not recommended: we don't guarantee backward nor forward ABI compatibility + this is a call-heavy library and function call overhead adds up.

#ifndef IMGUI_API

#define IMGUI_API

#endif

#ifndef IMGUI_IMPL_API

#define IMGUI_IMPL_API              IMGUI_API

#endif

// Helper Macros

#ifndef IM_ASSERT

#include <assert.h>

#define IM_ASSERT(_EXPR)            assert(_EXPR)                               // You can override the default assert handler by editing imconfig.h

#endif

#define IM_ARRAYSIZE(_ARR)          ((int)(sizeof(_ARR) / sizeof(*(_ARR))))     // Size of a static C-style array. Don't use on pointers!

#define IM_UNUSED(_VAR)             ((void)(_VAR))                              // Used to silence "unused variable warnings". Often useful as asserts may be stripped out from final builds.

// Check that version and structures layouts are matching between compiled imgui code and caller. Read comments above DebugCheckVersionAndDataLayout() for details.

#define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))

// Helper Macros - IM_FMTARGS, IM_FMTLIST: Apply printf-style warnings to our formatting functions.

// (MSVC provides an equivalent mechanism via SAL Annotations but it would require the macros in a different

//  location. e.g. #include <sal.h> + void myprintf(_Printf_format_string_ const char* format, ...))

#if !defined(IMGUI_USE_STB_SPRINTF) && defined(__MINGW32__) && !defined(__clang__)

#define IM_FMTARGS(FMT)             __attribute__((format(gnu_printf, FMT, FMT+1)))

#define IM_FMTLIST(FMT)             __attribute__((format(gnu_printf, FMT, 0)))

#elif !defined(IMGUI_USE_STB_SPRINTF) && (defined(__clang__) || defined(__GNUC__))

#define IM_FMTARGS(FMT)             __attribute__((format(printf, FMT, FMT+1)))

#define IM_FMTLIST(FMT)             __attribute__((format(printf, FMT, 0)))

#else

#define IM_FMTARGS(FMT)

#define IM_FMTLIST(FMT)

#endif

// Disable some of MSVC most aggressive Debug runtime checks in function header/footer (used in some simple/low-level functions)

#if defined(_MSC_VER) && !defined(__clang__)  && !defined(__INTEL_COMPILER) && !defined(IMGUI_DEBUG_PARANOID)

#define IM_MSVC_RUNTIME_CHECKS_OFF      __pragma(runtime_checks("",off))     __pragma(check_stack(off)) __pragma(strict_gs_check(push,off))

#define IM_MSVC_RUNTIME_CHECKS_RESTORE  __pragma(runtime_checks("",restore)) __pragma(check_stack())    __pragma(strict_gs_check(pop))

#else

#define IM_MSVC_RUNTIME_CHECKS_OFF

#define IM_MSVC_RUNTIME_CHECKS_RESTORE

#endif

// Warnings

#ifdef _MSC_VER

#pragma warning (push)

#pragma warning (disable: 26495)    // [Static Analyzer] Variable 'XXX' is uninitialized. Always initialize a member variable (type.6).

#endif

#if defined(__clang__)

#pragma clang diagnostic push

#if __has_warning("-Wunknown-warning-option")

#pragma clang diagnostic ignored "-Wunknown-warning-option"         // warning: unknown warning group 'xxx'

#endif

#pragma clang diagnostic ignored "-Wunknown-pragmas"                // warning: unknown warning group 'xxx'

#pragma clang diagnostic ignored "-Wold-style-cast"

#pragma clang diagnostic ignored "-Wfloat-equal"                    // warning: comparing floating point with == or != is unsafe

#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"

#pragma clang diagnostic ignored "-Wreserved-identifier"            // warning: identifier '_Xxx' is reserved because it starts with '_' followed by a capital letter

#pragma clang diagnostic ignored "-Wunsafe-buffer-usage"            // warning: 'xxx' is an unsafe pointer used for buffer access

#elif defined(__GNUC__)

#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Wpragmas"          // warning: unknown option after '#pragma GCC diagnostic' kind

#pragma GCC diagnostic ignored "-Wclass-memaccess"  // [__GNUC__ >= 8] warning: 'memset/memcpy' clearing/writing an object of type 'xxxx' with no trivial copy-assignment; use assignment or value-initialization instead

#endif

//-----------------------------------------------------------------------------

// [SECTION] Forward declarations and basic types

//-----------------------------------------------------------------------------

// Scalar data types

typedef unsigned int        ImGuiID;// A unique ID used by widgets (typically the result of hashing a stack of string)

typedef signed char         ImS8;   // 8-bit signed integer

typedef unsigned char       ImU8;   // 8-bit unsigned integer

typedef signed short        ImS16;  // 16-bit signed integer

typedef unsigned short      ImU16;  // 16-bit unsigned integer

typedef signed int          ImS32;  // 32-bit signed integer == int

typedef unsigned int        ImU32;  // 32-bit unsigned integer (often used to store packed colors)

typedef signed   long long  ImS64;  // 64-bit signed integer

typedef unsigned long long  ImU64;  // 64-bit unsigned integer

// Forward declarations

struct ImDrawChannel;               // Temporary storage to output draw commands out of order, used by ImDrawListSplitter and ImDrawList::ChannelsSplit()

struct ImDrawCmd;                   // A single draw command within a parent ImDrawList (generally maps to 1 GPU draw call, unless it is a callback)

struct ImDrawData;                  // All draw command lists required to render the frame + pos/size coordinates to use for the projection matrix.

struct ImDrawList;                  // A single draw command list (generally one per window, conceptually you may see this as a dynamic "mesh" builder)

struct ImDrawListSharedData;        // Data shared among multiple draw lists (typically owned by parent ImGui context, but you may create one yourself)

struct ImDrawListSplitter;          // Helper to split a draw list into different layers which can be drawn into out of order, then flattened back.

struct ImDrawVert;                  // A single vertex (pos + uv + col = 20 bytes by default. Override layout with IMGUI_OVERRIDE_DRAWVERT_STRUCT_LAYOUT)

struct ImFont;                      // Runtime data for a single font within a parent ImFontAtlas

struct ImFontAtlas;                 // Runtime data for multiple fonts, bake multiple fonts into a single texture, TTF/OTF font loader

struct ImFontBuilderIO;             // Opaque interface to a font builder (stb_truetype or FreeType).

struct ImFontConfig;                // Configuration data when adding a font or merging fonts

struct ImFontGlyph;                 // A single font glyph (code point + coordinates within in ImFontAtlas + offset)

struct ImFontGlyphRangesBuilder;    // Helper to build glyph ranges from text/string data

struct ImColor;                     // Helper functions to create a color that can be converted to either u32 or float4 (*OBSOLETE* please avoid using)

struct ImGuiContext;                // Dear ImGui context (opaque structure, unless including imgui_internal.h)

struct ImGuiIO;                     // Main configuration and I/O between your application and ImGui (also see: ImGuiPlatformIO)

struct ImGuiInputTextCallbackData;  // Shared state of InputText() when using custom ImGuiInputTextCallback (rare/advanced use)

struct ImGuiKeyData;                // Storage for ImGuiIO and IsKeyDown(), IsKeyPressed() etc functions.

struct ImGuiListClipper;            // Helper to manually clip large list of items

struct ImGuiMultiSelectIO;          // Structure to interact with a BeginMultiSelect()/EndMultiSelect() block

struct ImGuiOnceUponAFrame;         // Helper for running a block of code not more than once a frame

struct ImGuiPayload;                // User data payload for drag and drop operations

struct ImGuiPlatformIO;             // Interface between platform/renderer backends and ImGui (e.g. Clipboard, IME, Multi-Viewport support). Extends ImGuiIO.

struct ImGuiPlatformImeData;        // Platform IME data for io.PlatformSetImeDataFn() function.

struct ImGuiPlatformMonitor;        // Multi-viewport support: user-provided bounds for each connected monitor/display. Used when positioning popups and tooltips to avoid them straddling monitors

struct ImGuiSelectionBasicStorage;  // Optional helper to store multi-selection state + apply multi-selection requests.

struct ImGuiSelectionExternalStorage;//Optional helper to apply multi-selection requests to existing randomly accessible storage.

struct ImGuiSelectionRequest;       // A selection request (stored in ImGuiMultiSelectIO)

struct ImGuiSizeCallbackData;       // Callback data when using SetNextWindowSizeConstraints() (rare/advanced use)

struct ImGuiStorage;                // Helper for key->value storage (container sorted by key)

struct ImGuiStoragePair;            // Helper for key->value storage (pair)

struct ImGuiStyle;                  // Runtime data for styling/colors

struct ImGuiTableSortSpecs;         // Sorting specifications for a table (often handling sort specs for a single column, occasionally more)

struct ImGuiTableColumnSortSpecs;   // Sorting specification for one column of a table

struct ImGuiTextBuffer;             // Helper to hold and append into a text buffer (~string builder)

struct ImGuiTextFilter;             // Helper to parse and apply text filters (e.g. "aaaaa[,bbbbb][,ccccc]")

struct ImGuiViewport;               // A Platform Window (always 1 unless multi-viewport are enabled. One per platform window to output to). In the future may represent Platform Monitor

struct ImGuiWindowClass;            // Window class (rare/advanced uses: provide hints to the platform backend via altered viewport flags and parent/child info)

// Enumerations

// - We don't use strongly typed enums much because they add constraints (can't extend in private code, can't store typed in bit fields, extra casting on iteration)

// - Tip: Use your programming IDE navigation facilities on the names in the _central column_ below to find the actual flags/enum lists!

//   - In Visual Studio: CTRL+comma ("Edit.GoToAll") can follow symbols inside comments, whereas CTRL+F12 ("Edit.GoToImplementation") cannot.

//   - In Visual Studio w/ Visual Assist installed: ALT+G ("VAssistX.GoToImplementation") can also follow symbols inside comments.

//   - In VS Code, CLion, etc.: CTRL+click can follow symbols inside comments.

enum ImGuiDir : int;                // -> enum ImGuiDir              // Enum: A cardinal direction (Left, Right, Up, Down)

enum ImGuiKey : int;                // -> enum ImGuiKey              // Enum: A key identifier (ImGuiKey_XXX or ImGuiMod_XXX value)

enum ImGuiMouseSource : int;        // -> enum ImGuiMouseSource      // Enum; A mouse input source identifier (Mouse, TouchScreen, Pen)

enum ImGuiSortDirection : ImU8;     // -> enum ImGuiSortDirection    // Enum: A sorting direction (ascending or descending)

typedef int ImGuiCol;               // -> enum ImGuiCol_             // Enum: A color identifier for styling

typedef int ImGuiCond;              // -> enum ImGuiCond_            // Enum: A condition for many Set*() functions

typedef int ImGuiDataType;          // -> enum ImGuiDataType_        // Enum: A primary data type

typedef int ImGuiMouseButton;       // -> enum ImGuiMouseButton_     // Enum: A mouse button identifier (0=left, 1=right, 2=middle)

typedef int ImGuiMouseCursor;       // -> enum ImGuiMouseCursor_     // Enum: A mouse cursor shape

typedef int ImGuiStyleVar;          // -> enum ImGuiStyleVar_        // Enum: A variable identifier for styling

typedef int ImGuiTableBgTarget;     // -> enum ImGuiTableBgTarget_   // Enum: A color target for TableSetBgColor()

// Flags (declared as int to allow using as flags without overhead, and to not pollute the top of this file)

// - Tip: Use your programming IDE navigation facilities on the names in the _central column_ below to find the actual flags/enum lists!

//   - In Visual Studio: CTRL+comma ("Edit.GoToAll") can follow symbols inside comments, whereas CTRL+F12 ("Edit.GoToImplementation") cannot.

//   - In Visual Studio w/ Visual Assist installed: ALT+G ("VAssistX.GoToImplementation") can also follow symbols inside comments.

//   - In VS Code, CLion, etc.: CTRL+click can follow symbols inside comments.

typedef int ImDrawFlags;            // -> enum ImDrawFlags_          // Flags: for ImDrawList functions

typedef int ImDrawListFlags;        // -> enum ImDrawListFlags_      // Flags: for ImDrawList instance

typedef int ImFontAtlasFlags;       // -> enum ImFontAtlasFlags_     // Flags: for ImFontAtlas build

typedef int ImGuiBackendFlags;      // -> enum ImGuiBackendFlags_    // Flags: for io.BackendFlags

typedef int ImGuiButtonFlags;       // -> enum ImGuiButtonFlags_     // Flags: for InvisibleButton()

typedef int ImGuiChildFlags;        // -> enum ImGuiChildFlags_      // Flags: for BeginChild()

typedef int ImGuiColorEditFlags;    // -> enum ImGuiColorEditFlags_  // Flags: for ColorEdit4(), ColorPicker4() etc.

typedef int ImGuiConfigFlags;       // -> enum ImGuiConfigFlags_     // Flags: for io.ConfigFlags

typedef int ImGuiComboFlags;        // -> enum ImGuiComboFlags_      // Flags: for BeginCombo()

typedef int ImGuiDockNodeFlags;     // -> enum ImGuiDockNodeFlags_   // Flags: for DockSpace()

typedef int ImGuiDragDropFlags;     // -> enum ImGuiDragDropFlags_   // Flags: for BeginDragDropSource(), AcceptDragDropPayload()

typedef int ImGuiFocusedFlags;      // -> enum ImGuiFocusedFlags_    // Flags: for IsWindowFocused()

typedef int ImGuiHoveredFlags;      // -> enum ImGuiHoveredFlags_    // Flags: for IsItemHovered(), IsWindowHovered() etc.

typedef int ImGuiInputFlags;        // -> enum ImGuiInputFlags_      // Flags: for Shortcut(), SetNextItemShortcut()

typedef int ImGuiInputTextFlags;    // -> enum ImGuiInputTextFlags_  // Flags: for InputText(), InputTextMultiline()

typedef int ImGuiItemFlags;         // -> enum ImGuiItemFlags_       // Flags: for PushItemFlag(), shared by all items

typedef int ImGuiKeyChord;          // -> ImGuiKey | ImGuiMod_XXX    // Flags: for IsKeyChordPressed(), Shortcut() etc. an ImGuiKey optionally OR-ed with one or more ImGuiMod_XXX values.

typedef int ImGuiPopupFlags;        // -> enum ImGuiPopupFlags_      // Flags: for OpenPopup*(), BeginPopupContext*(), IsPopupOpen()

typedef int ImGuiMultiSelectFlags;  // -> enum ImGuiMultiSelectFlags_// Flags: for BeginMultiSelect()

typedef int ImGuiSelectableFlags;   // -> enum ImGuiSelectableFlags_ // Flags: for Selectable()

typedef int ImGuiSliderFlags;       // -> enum ImGuiSliderFlags_     // Flags: for DragFloat(), DragInt(), SliderFloat(), SliderInt() etc.

typedef int ImGuiTabBarFlags;       // -> enum ImGuiTabBarFlags_     // Flags: for BeginTabBar()

typedef int ImGuiTabItemFlags;      // -> enum ImGuiTabItemFlags_    // Flags: for BeginTabItem()

typedef int ImGuiTableFlags;        // -> enum ImGuiTableFlags_      // Flags: For BeginTable()

typedef int ImGuiTableColumnFlags;  // -> enum ImGuiTableColumnFlags_// Flags: For TableSetupColumn()

typedef int ImGuiTableRowFlags;     // -> enum ImGuiTableRowFlags_   // Flags: For TableNextRow()

typedef int ImGuiTreeNodeFlags;     // -> enum ImGuiTreeNodeFlags_   // Flags: for TreeNode(), TreeNodeEx(), CollapsingHeader()

typedef int ImGuiViewportFlags;     // -> enum ImGuiViewportFlags_   // Flags: for ImGuiViewport

typedef int ImGuiWindowFlags;       // -> enum ImGuiWindowFlags_     // Flags: for Begin(), BeginChild()

// ImTexture: user data for renderer backend to identify a texture [Compile-time configurable type]

// - To use something else than an opaque void* pointer: override with e.g. '#define ImTextureID MyTextureType*' in your imconfig.h file.

// - This can be whatever to you want it to be! read the FAQ about ImTextureID for details.

// - You can make this a structure with various constructors if you need. You will have to implement ==/!= operators.

// - (note: before v1.91.4 (2024/10/08) the default type for ImTextureID was void*. Use intermediary intptr_t cast and read FAQ if you have casting warnings)

#ifndef ImTextureID

typedef ImU64 ImTextureID;          // Default: store a pointer or an integer fitting in a pointer (most renderer backends are ok with that)

#endif

// ImDrawIdx: vertex index. [Compile-time configurable type]

// - To use 16-bit indices + allow large meshes: backend need to set 'io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset' and handle ImDrawCmd::VtxOffset (recommended).

// - To use 32-bit indices: override with '#define ImDrawIdx unsigned int' in your imconfig.h file.

#ifndef ImDrawIdx

typedef unsigned short ImDrawIdx;   // Default: 16-bit (for maximum compatibility with renderer backends)

#endif

// Character types

// (we generally use UTF-8 encoded string in the API. This is storage specifically for a decoded character used for keyboard input and display)

typedef unsigned int ImWchar32;     // A single decoded U32 character/code point. We encode them as multi bytes UTF-8 when used in strings.

typedef unsigned short ImWchar16;   // A single decoded U16 character/code point. We encode them as multi bytes UTF-8 when used in strings.

#ifdef IMGUI_USE_WCHAR32            // ImWchar [configurable type: override in imconfig.h with '#define IMGUI_USE_WCHAR32' to support Unicode planes 1-16]

typedef ImWchar32 ImWchar;

#else

typedef ImWchar16 ImWchar;

#endif

// Multi-Selection item index or identifier when using BeginMultiSelect()

// - Used by SetNextItemSelectionUserData() + and inside ImGuiMultiSelectIO structure.

// - Most users are likely to use this store an item INDEX but this may be used to store a POINTER/ID as well. Read comments near ImGuiMultiSelectIO for details.

typedef ImS64 ImGuiSelectionUserData;

// Callback and functions types

typedef int     (*ImGuiInputTextCallback)(ImGuiInputTextCallbackData* data);    // Callback function for ImGui::InputText()

typedef void    (*ImGuiSizeCallback)(ImGuiSizeCallbackData* data);              // Callback function for ImGui::SetNextWindowSizeConstraints()

typedef void*   (*ImGuiMemAllocFunc)(size_t sz, void* user_data);               // Function signature for ImGui::SetAllocatorFunctions()

typedef void    (*ImGuiMemFreeFunc)(void* ptr, void* user_data);                // Function signature for ImGui::SetAllocatorFunctions()

// ImVec2: 2D vector used to store positions, sizes etc. [Compile-time configurable type]

// - This is a frequently used type in the API. Consider using IM_VEC2_CLASS_EXTRA to create implicit cast from/to our preferred type.

// - Add '#define IMGUI_DEFINE_MATH_OPERATORS' before including this file (or in imconfig.h) to access courtesy maths operators for ImVec2 and ImVec4.

IM_MSVC_RUNTIME_CHECKS_OFF

struct ImVec2

{

    float                                   x, y;

    constexpr ImVec2()                      : x(0.0f), y(0.0f) { }

    constexpr ImVec2(float _x, float _y)    : x(_x), y(_y) { }

    float& operator[] (size_t idx)          { IM_ASSERT(idx == 0 || idx == 1); return ((float*)(void*)(char*)this)[idx]; } // We very rarely use this [] operator, so the assert overhead is fine.

    float  operator[] (size_t idx) const    { IM_ASSERT(idx == 0 || idx == 1); return ((const float*)(const void*)(const char*)this)[idx]; }

#ifdef IM_VEC2_CLASS_EXTRA

    IM_VEC2_CLASS_EXTRA     // Define additional constructors and implicit cast operators in imconfig.h to convert back and forth between your math types and ImVec2.

#endif

};

// ImVec4: 4D vector used to store clipping rectangles, colors etc. [Compile-time configurable type]

struct ImVec4

{

    float                                                     x, y, z, w;

    constexpr ImVec4()                                        : x(0.0f), y(0.0f), z(0.0f), w(0.0f) { }

    constexpr ImVec4(float _x, float _y, float _z, float _w)  : x(_x), y(_y), z(_z), w(_w) { }

#ifdef IM_VEC4_CLASS_EXTRA

    IM_VEC4_CLASS_EXTRA     // Define additional constructors and implicit cast operators in imconfig.h to convert back and forth between your math types and ImVec4.

#endif

};

IM_MSVC_RUNTIME_CHECKS_RESTORE

//-----------------------------------------------------------------------------

// [SECTION] Dear ImGui end-user API functions

// (Note that ImGui:: being a namespace, you can add extra ImGui:: functions in your own separate file. Please don't modify imgui source files!)

//-----------------------------------------------------------------------------

namespace ImGui

{

    // Context creation and access

    // - Each context create its own ImFontAtlas by default. You may instance one yourself and pass it to CreateContext() to share a font atlas between contexts.

    // - DLL users: heaps and globals are not shared across DLL boundaries! You will need to call SetCurrentContext() + SetAllocatorFunctions()

    //   for each static/DLL boundary you are calling from. Read "Context and Memory Allocators" section of imgui.cpp for details.

    IMGUI_API ImGuiContext* CreateContext(ImFontAtlas* shared_font_atlas = NULL);

    IMGUI_API void          DestroyContext(ImGuiContext* ctx = NULL);   // NULL = destroy current context

    IMGUI_API ImGuiContext* GetCurrentContext();

    IMGUI_API void          SetCurrentContext(ImGuiContext* ctx);

    // Main

    IMGUI_API ImGuiIO&      GetIO();                                    // access the ImGuiIO structure (mouse/keyboard/gamepad inputs, time, various configuration options/flags)

    IMGUI_API ImGuiPlatformIO& GetPlatformIO();                         // access the ImGuiPlatformIO structure (mostly hooks/functions to connect to platform/renderer and OS Clipboard, IME etc.)

    IMGUI_API ImGuiStyle&   GetStyle();                                 // access the Style structure (colors, sizes). Always use PushStyleColor(), PushStyleVar() to modify style mid-frame!

    IMGUI_API void          NewFrame();                                 // start a new Dear ImGui frame, you can submit any command from this point until Render()/EndFrame().

    IMGUI_API void          EndFrame();                                 // ends the Dear ImGui frame. automatically called by Render(). If you don't need to render data (skipping rendering) you may call EndFrame() without Render()... but you'll have wasted CPU already! If you don't need to render, better to not create any windows and not call NewFrame() at all!

    IMGUI_API void          Render();                                   // ends the Dear ImGui frame, finalize the draw data. You can then get call GetDrawData().

    IMGUI_API ImDrawData*   GetDrawData();                              // valid after Render() and until the next call to NewFrame(). this is what you have to render.

    // Demo, Debug, Information

    IMGUI_API void          ShowDemoWindow(bool* p_open = NULL);        // create Demo window. demonstrate most ImGui features. call this to learn about the library! try to make it always available in your application!

    IMGUI_API void          ShowMetricsWindow(bool* p_open = NULL);     // create Metrics/Debugger window. display Dear ImGui internals: windows, draw commands, various internal state, etc.

    IMGUI_API void          ShowDebugLogWindow(bool* p_open = NULL);    // create Debug Log window. display a simplified log of important dear imgui events.

    IMGUI_API void          ShowIDStackToolWindow(bool* p_open = NULL); // create Stack Tool window. hover items with mouse to query information about the source of their unique ID.

    IMGUI_API void          ShowAboutWindow(bool* p_open = NULL);       // create About window. display Dear ImGui version, credits and build/system information.

    IMGUI_API void          ShowStyleEditor(ImGuiStyle* ref = NULL);    // add style editor block (not a window). you can pass in a reference ImGuiStyle structure to compare to, revert to and save to (else it uses the default style)

    IMGUI_API bool          ShowStyleSelector(const char* label);       // add style selector block (not a window), essentially a combo listing the default styles.

    IMGUI_API void          ShowFontSelector(const char* label);        // add font selector block (not a window), essentially a combo listing the loaded fonts.

    IMGUI_API void          ShowUserGuide();                            // add basic help/info block (not a window): how to manipulate ImGui as an end-user (mouse/keyboard controls).

    IMGUI_API const char*   GetVersion();                               // get the compiled version string e.g. "1.80 WIP" (essentially the value for IMGUI_VERSION from the compiled version of imgui.cpp)

    // Styles

    IMGUI_API void          StyleColorsDark(ImGuiStyle* dst = NULL);    // new, recommended style (default)

    IMGUI_API void          StyleColorsLight(ImGuiStyle* dst = NULL);   // best used with borders and a custom, thicker font

    IMGUI_API void          StyleColorsClassic(ImGuiStyle* dst = NULL); // classic imgui style

    // Windows

    // - Begin() = push window to the stack and start appending to it. End() = pop window from the stack.

    // - Passing 'bool* p_open != NULL' shows a window-closing widget in the upper-right corner of the window,

    //   which clicking will set the boolean to false when clicked.

    // - You may append multiple times to the same window during the same frame by calling Begin()/End() pairs multiple times.

    //   Some information such as 'flags' or 'p_open' will only be considered by the first call to Begin().

    // - Begin() return false to indicate the window is collapsed or fully clipped, so you may early out and omit submitting

    //   anything to the window. Always call a matching End() for each Begin() call, regardless of its return value!

    //   [Important: due to legacy reason, Begin/End and BeginChild/EndChild are inconsistent with all other functions

    //    such as BeginMenu/EndMenu, BeginPopup/EndPopup, etc. where the EndXXX call should only be called if the corresponding

    //    BeginXXX function returned true. Begin and BeginChild are the only odd ones out. Will be fixed in a future update.]

    // - Note that the bottom of window stack always contains a window called "Debug".

    IMGUI_API bool          Begin(const char* name, bool* p_open = NULL, ImGuiWindowFlags flags = 0);

    IMGUI_API void          End();

    // Child Windows

    // - Use child windows to begin into a self-contained independent scrolling/clipping regions within a host window. Child windows can embed their own child.

    // - Before 1.90 (November 2023), the "ImGuiChildFlags child_flags = 0" parameter was "bool border = false".

    //   This API is backward compatible with old code, as we guarantee that ImGuiChildFlags_Borders == true.

    //   Consider updating your old code:

    //      BeginChild("Name", size, false)   -> Begin("Name", size, 0); or Begin("Name", size, ImGuiChildFlags_None);

    //      BeginChild("Name", size, true)    -> Begin("Name", size, ImGuiChildFlags_Borders);

    // - Manual sizing (each axis can use a different setting e.g. ImVec2(0.0f, 400.0f)):

    //     == 0.0f: use remaining parent window size for this axis.

    //      > 0.0f: use specified size for this axis.

    //      < 0.0f: right/bottom-align to specified distance from available content boundaries.

    // - Specifying ImGuiChildFlags_AutoResizeX or ImGuiChildFlags_AutoResizeY makes the sizing automatic based on child contents.

    //   Combining both ImGuiChildFlags_AutoResizeX _and_ ImGuiChildFlags_AutoResizeY defeats purpose of a scrolling region and is NOT recommended.

    // - BeginChild() returns false to indicate the window is collapsed or fully clipped, so you may early out and omit submitting

    //   anything to the window. Always call a matching EndChild() for each BeginChild() call, regardless of its return value.

    //   [Important: due to legacy reason, Begin/End and BeginChild/EndChild are inconsistent with all other functions

    //    such as BeginMenu/EndMenu, BeginPopup/EndPopup, etc. where the EndXXX call should only be called if the corresponding

    //    BeginXXX function returned true. Begin and BeginChild are the only odd ones out. Will be fixed in a future update.]

    IMGUI_API bool          BeginChild(const char* str_id, const ImVec2& size = ImVec2(0, 0), ImGuiChildFlags child_flags = 0, ImGuiWindowFlags window_flags = 0);

    IMGUI_API bool          BeginChild(ImGuiID id, const ImVec2& size = ImVec2(0, 0), ImGuiChildFlags child_flags = 0, ImGuiWindowFlags window_flags = 0);

    IMGUI_API void          EndChild();

    // Windows Utilities

    // - 'current window' = the window we are appending into while inside a Begin()/End() block. 'next window' = next window we will Begin() into.

    IMGUI_API bool          IsWindowAppearing();

    IMGUI_API bool          IsWindowCollapsed();

    IMGUI_API bool          IsWindowFocused(ImGuiFocusedFlags flags=0); // is current window focused? or its root/child, depending on flags. see flags for options.

    IMGUI_API bool          IsWindowHovered(ImGuiHoveredFlags flags=0); // is current window hovered and hoverable (e.g. not blocked by a popup/modal)? See ImGuiHoveredFlags_ for options. IMPORTANT: If you are trying to check whether your mouse should be dispatched to Dear ImGui or to your underlying app, you should not use this function! Use the 'io.WantCaptureMouse' boolean for that! Refer to FAQ entry "How can I tell whether to dispatch mouse/keyboard to Dear ImGui or my application?" for details.

    IMGUI_API ImDrawList*   GetWindowDrawList();                        // get draw list associated to the current window, to append your own drawing primitives

    IMGUI_API float         GetWindowDpiScale();                        // get DPI scale currently associated to the current window's viewport.

    IMGUI_API ImVec2        GetWindowPos();                             // get current window position in screen space (IT IS UNLIKELY YOU EVER NEED TO USE THIS. Consider always using GetCursorScreenPos() and GetContentRegionAvail() instead)

    IMGUI_API ImVec2        GetWindowSize();                            // get current window size (IT IS UNLIKELY YOU EVER NEED TO USE THIS. Consider always using GetCursorScreenPos() and GetContentRegionAvail() instead)

    IMGUI_API float         GetWindowWidth();                           // get current window width (IT IS UNLIKELY YOU EVER NEED TO USE THIS). Shortcut for GetWindowSize().x.

    IMGUI_API float         GetWindowHeight();                          // get current window height (IT IS UNLIKELY YOU EVER NEED TO USE THIS). Shortcut for GetWindowSize().y.

    IMGUI_API ImGuiViewport*GetWindowViewport();                        // get viewport currently associated to the current window.

    // Window manipulation

    // - Prefer using SetNextXXX functions (before Begin) rather that SetXXX functions (after Begin).

    IMGUI_API void          SetNextWindowPos(const ImVec2& pos, ImGuiCond cond = 0, const ImVec2& pivot = ImVec2(0, 0)); // set next window position. call before Begin(). use pivot=(0.5f,0.5f) to center on given point, etc.

    IMGUI_API void          SetNextWindowSize(const ImVec2& size, ImGuiCond cond = 0);                  // set next window size. set axis to 0.0f to force an auto-fit on this axis. call before Begin()

    IMGUI_API void          SetNextWindowSizeConstraints(const ImVec2& size_min, const ImVec2& size_max, ImGuiSizeCallback custom_callback = NULL, void* custom_callback_data = NULL); // set next window size limits. use 0.0f or FLT_MAX if you don't want limits. Use -1 for both min and max of same axis to preserve current size (which itself is a constraint). Use callback to apply non-trivial programmatic constraints.

    IMGUI_API void          SetNextWindowContentSize(const ImVec2& size);                               // set next window content size (~ scrollable client area, which enforce the range of scrollbars). Not including window decorations (title bar, menu bar, etc.) nor WindowPadding. set an axis to 0.0f to leave it automatic. call before Begin()

    IMGUI_API void          SetNextWindowCollapsed(bool collapsed, ImGuiCond cond = 0);                 // set next window collapsed state. call before Begin()

    IMGUI_API void          SetNextWindowFocus();                                                       // set next window to be focused / top-most. call before Begin()

    IMGUI_API void          SetNextWindowScroll(const ImVec2& scroll);                                  // set next window scrolling value (use < 0.0f to not affect a given axis).

    IMGUI_API void          SetNextWindowBgAlpha(float alpha);                                          // set next window background color alpha. helper to easily override the Alpha component of ImGuiCol_WindowBg/ChildBg/PopupBg. you may also use ImGuiWindowFlags_NoBackground.

    IMGUI_API void          SetNextWindowViewport(ImGuiID viewport_id);                                 // set next window viewport

    IMGUI_API void          SetWindowPos(const ImVec2& pos, ImGuiCond cond = 0);                        // (not recommended) set current window position - call within Begin()/End(). prefer using SetNextWindowPos(), as this may incur tearing and side-effects.

    IMGUI_API void          SetWindowSize(const ImVec2& size, ImGuiCond cond = 0);                      // (not recommended) set current window size - call within Begin()/End(). set to ImVec2(0, 0) to force an auto-fit. prefer using SetNextWindowSize(), as this may incur tearing and minor side-effects.

    IMGUI_API void          SetWindowCollapsed(bool collapsed, ImGuiCond cond = 0);                     // (not recommended) set current window collapsed state. prefer using SetNextWindowCollapsed().

    IMGUI_API void          SetWindowFocus();                                                           // (not recommended) set current window to be focused / top-most. prefer using SetNextWindowFocus().

    IMGUI_API void          SetWindowFontScale(float scale);                                            // [OBSOLETE] set font scale. Adjust IO.FontGlobalScale if you want to scale all windows. This is an old API! For correct scaling, prefer to reload font + rebuild ImFontAtlas + call style.ScaleAllSizes().

    IMGUI_API void          SetWindowPos(const char* name, const ImVec2& pos, ImGuiCond cond = 0);      // set named window position.

    IMGUI_API void          SetWindowSize(const char* name, const ImVec2& size, ImGuiCond cond = 0);    // set named window size. set axis to 0.0f to force an auto-fit on this axis.

    IMGUI_API void          SetWindowCollapsed(const char* name, bool collapsed, ImGuiCond cond = 0);   // set named window collapsed state

    IMGUI_API void          SetWindowFocus(const char* name);                                           // set named window to be focused / top-most. use NULL to remove focus.

    // Windows Scrolling

    // - Any change of Scroll will be applied at the beginning of next frame in the first call to Begin().

    // - You may instead use SetNextWindowScroll() prior to calling Begin() to avoid this delay, as an alternative to using SetScrollX()/SetScrollY().

    IMGUI_API float         GetScrollX();                                                   // get scrolling amount [0 .. GetScrollMaxX()]

    IMGUI_API float         GetScrollY();                                                   // get scrolling amount [0 .. GetScrollMaxY()]

    IMGUI_API void          SetScrollX(float scroll_x);                                     // set scrolling amount [0 .. GetScrollMaxX()]

    IMGUI_API void          SetScrollY(float scroll_y);                                     // set scrolling amount [0 .. GetScrollMaxY()]

    IMGUI_API float         GetScrollMaxX();                                                // get maximum scrolling amount ~~ ContentSize.x - WindowSize.x - DecorationsSize.x

    IMGUI_API float         GetScrollMaxY();                                                // get maximum scrolling amount ~~ ContentSize.y - WindowSize.y - DecorationsSize.y

    IMGUI_API void          SetScrollHereX(float center_x_ratio = 0.5f);                    // adjust scrolling amount to make current cursor position visible. center_x_ratio=0.0: left, 0.5: center, 1.0: right. When using to make a "default/current item" visible, consider using SetItemDefaultFocus() instead.

    IMGUI_API void          SetScrollHereY(float center_y_ratio = 0.5f);                    // adjust scrolling amount to make current cursor position visible. center_y_ratio=0.0: top, 0.5: center, 1.0: bottom. When using to make a "default/current item" visible, consider using SetItemDefaultFocus() instead.

    IMGUI_API void          SetScrollFromPosX(float local_x, float center_x_ratio = 0.5f);  // adjust scrolling amount to make given position visible. Generally GetCursorStartPos() + offset to compute a valid position.

    IMGUI_API void          SetScrollFromPosY(float local_y, float center_y_ratio = 0.5f);  // adjust scrolling amount to make given position visible. Generally GetCursorStartPos() + offset to compute a valid position.

    // Parameters stacks (shared)

    IMGUI_API void          PushFont(ImFont* font);                                         // use NULL as a shortcut to push default font

    IMGUI_API void          PopFont();

    IMGUI_API void          PushStyleColor(ImGuiCol idx, ImU32 col);                        // modify a style color. always use this if you modify the style after NewFrame().

    IMGUI_API void          PushStyleColor(ImGuiCol idx, const ImVec4& col);

    IMGUI_API void          PopStyleColor(int count = 1);

    IMGUI_API void          PushStyleVar(ImGuiStyleVar idx, float val);                     // modify a style float variable. always use this if you modify the style after NewFrame()!

    IMGUI_API void          PushStyleVar(ImGuiStyleVar idx, const ImVec2& val);             // modify a style ImVec2 variable. "

    IMGUI_API void          PushStyleVarX(ImGuiStyleVar idx, float val_x);                  // modify X component of a style ImVec2 variable. "

    IMGUI_API void          PushStyleVarY(ImGuiStyleVar idx, float val_y);                  // modify Y component of a style ImVec2 variable. "

    IMGUI_API void          PopStyleVar(int count = 1);

    IMGUI_API void          PushItemFlag(ImGuiItemFlags option, bool enabled);              // modify specified shared item flag, e.g. PushItemFlag(ImGuiItemFlags_NoTabStop, true)

    IMGUI_API void          PopItemFlag();

    // Parameters stacks (current window)

    IMGUI_API void          PushItemWidth(float item_width);                                // push width of items for common large "item+label" widgets. >0.0f: width in pixels, <0.0f align xx pixels to the right of window (so -FLT_MIN always align width to the right side).

    IMGUI_API void          PopItemWidth();

    IMGUI_API void          SetNextItemWidth(float item_width);                             // set width of the _next_ common large "item+label" widget. >0.0f: width in pixels, <0.0f align xx pixels to the right of window (so -FLT_MIN always align width to the right side)

    IMGUI_API float         CalcItemWidth();                                                // width of item given pushed settings and current cursor position. NOT necessarily the width of last item unlike most 'Item' functions.

    IMGUI_API void          PushTextWrapPos(float wrap_local_pos_x = 0.0f);                 // push word-wrapping position for Text*() commands. < 0.0f: no wrapping; 0.0f: wrap to end of window (or column); > 0.0f: wrap at 'wrap_pos_x' position in window local space

    IMGUI_API void          PopTextWrapPos();

    // Style read access

    // - Use the ShowStyleEditor() function to interactively see/edit the colors.

    IMGUI_API ImFont*       GetFont();                                                      // get current font

    IMGUI_API float         GetFontSize();                                                  // get current font size (= height in pixels) of current font with current scale applied

    IMGUI_API ImVec2        GetFontTexUvWhitePixel();                                       // get UV coordinate for a white pixel, useful to draw custom shapes via the ImDrawList API

    IMGUI_API ImU32         GetColorU32(ImGuiCol idx, float alpha_mul = 1.0f);              // retrieve given style color with style alpha applied and optional extra alpha multiplier, packed as a 32-bit value suitable for ImDrawList

    IMGUI_API ImU32         GetColorU32(const ImVec4& col);                                 // retrieve given color with style alpha applied, packed as a 32-bit value suitable for ImDrawList

    IMGUI_API ImU32         GetColorU32(ImU32 col, float alpha_mul = 1.0f);                 // retrieve given color with style alpha applied, packed as a 32-bit value suitable for ImDrawList

    IMGUI_API const ImVec4& GetStyleColorVec4(ImGuiCol idx);                                // retrieve style color as stored in ImGuiStyle structure. use to feed back into PushStyleColor(), otherwise use GetColorU32() to get style color with style alpha baked in.

    // Layout cursor positioning

    // - By "cursor" we mean the current output position.

    // - The typical widget behavior is to output themselves at the current cursor position, then move the cursor one line down.

    // - You can call SameLine() between widgets to undo the last carriage return and output at the right of the preceding widget.

    // - YOU CAN DO 99% OF WHAT YOU NEED WITH ONLY GetCursorScreenPos() and GetContentRegionAvail().

    // - Attention! We currently have inconsistencies between window-local and absolute positions we will aim to fix with future API:

    //    - Absolute coordinate:        GetCursorScreenPos(), SetCursorScreenPos(), all ImDrawList:: functions. -> this is the preferred way forward.

    //    - Window-local coordinates:   SameLine(offset), GetCursorPos(), SetCursorPos(), GetCursorStartPos(), PushTextWrapPos()

    //    - Window-local coordinates:   GetContentRegionMax(), GetWindowContentRegionMin(), GetWindowContentRegionMax() --> all obsoleted. YOU DON'T NEED THEM.

    // - GetCursorScreenPos() = GetCursorPos() + GetWindowPos(). GetWindowPos() is almost only ever useful to convert from window-local to absolute coordinates. Try not to use it.

    IMGUI_API ImVec2        GetCursorScreenPos();                                           // cursor position, absolute coordinates. THIS IS YOUR BEST FRIEND (prefer using this rather than GetCursorPos(), also more useful to work with ImDrawList API).

    IMGUI_API void          SetCursorScreenPos(const ImVec2& pos);                          // cursor position, absolute coordinates. THIS IS YOUR BEST FRIEND.

    IMGUI_API ImVec2        GetContentRegionAvail();                                        // available space from current position. THIS IS YOUR BEST FRIEND.

    IMGUI_API ImVec2        GetCursorPos();                                                 // [window-local] cursor position in window-local coordinates. This is not your best friend.

    IMGUI_API float         GetCursorPosX();                                                // [window-local] "

    IMGUI_API float         GetCursorPosY();                                                // [window-local] "

    IMGUI_API void          SetCursorPos(const ImVec2& local_pos);                          // [window-local] "

    IMGUI_API void          SetCursorPosX(float local_x);                                   // [window-local] "

    IMGUI_API void          SetCursorPosY(float local_y);                                   // [window-local] "

    IMGUI_API ImVec2        GetCursorStartPos();                                            // [window-local] initial cursor position, in window-local coordinates. Call GetCursorScreenPos() after Begin() to get the absolute coordinates version.

    // Other layout functions

    IMGUI_API void          Separator();                                                    // separator, generally horizontal. inside a menu bar or in horizontal layout mode, this becomes a vertical separator.

    IMGUI_API void          SameLine(float offset_from_start_x=0.0f, float spacing=-1.0f);  // call between widgets or groups to layout them horizontally. X position given in window coordinates.

    IMGUI_API void          NewLine();                                                      // undo a SameLine() or force a new line when in a horizontal-layout context.

    IMGUI_API void          Spacing();                                                      // add vertical spacing.

    IMGUI_API void          Dummy(const ImVec2& size);                                      // add a dummy item of given size. unlike InvisibleButton(), Dummy() won't take the mouse click or be navigable into.

    IMGUI_API void          Indent(float indent_w = 0.0f);                                  // move content position toward the right, by indent_w, or style.IndentSpacing if indent_w <= 0

    IMGUI_API void          Unindent(float indent_w = 0.0f);                                // move content position back to the left, by indent_w, or style.IndentSpacing if indent_w <= 0

    IMGUI_API void          BeginGroup();                                                   // lock horizontal starting position

    IMGUI_API void          EndGroup();                                                     // unlock horizontal starting position + capture the whole group bounding box into one "item" (so you can use IsItemHovered() or layout primitives such as SameLine() on whole group, etc.)

    IMGUI_API void          AlignTextToFramePadding();                                      // vertically align upcoming text baseline to FramePadding.y so that it will align properly to regularly framed items (call if you have text on a line before a framed item)

    IMGUI_API float         GetTextLineHeight();                                            // ~ FontSize

    IMGUI_API float         GetTextLineHeightWithSpacing();                                 // ~ FontSize + style.ItemSpacing.y (distance in pixels between 2 consecutive lines of text)

    IMGUI_API float         GetFrameHeight();                                               // ~ FontSize + style.FramePadding.y * 2

    IMGUI_API float         GetFrameHeightWithSpacing();                                    // ~ FontSize + style.FramePadding.y * 2 + style.ItemSpacing.y (distance in pixels between 2 consecutive lines of framed widgets)

    // ID stack/scopes

    // Read the FAQ (docs/FAQ.md or http://dearimgui.com/faq) for more details about how ID are handled in dear imgui.

    // - Those questions are answered and impacted by understanding of the ID stack system:

    //   - "Q: Why is my widget not reacting when I click on it?"

    //   - "Q: How can I have widgets with an empty label?"

    //   - "Q: How can I have multiple widgets with the same label?"

    // - Short version: ID are hashes of the entire ID stack. If you are creating widgets in a loop you most likely

    //   want to push a unique identifier (e.g. object pointer, loop index) to uniquely differentiate them.

    // - You can also use the "Label##foobar" syntax within widget label to distinguish them from each others.

    // - In this header file we use the "label"/"name" terminology to denote a string that will be displayed + used as an ID,

    //   whereas "str_id" denote a string that is only used as an ID and not normally displayed.

    IMGUI_API void          PushID(const char* str_id);                                     // push string into the ID stack (will hash string).

    IMGUI_API void          PushID(const char* str_id_begin, const char* str_id_end);       // push string into the ID stack (will hash string).

    IMGUI_API void          PushID(const void* ptr_id);                                     // push pointer into the ID stack (will hash pointer).

    IMGUI_API void          PushID(int int_id);                                             // push integer into the ID stack (will hash integer).

    IMGUI_API void          PopID();                                                        // pop from the ID stack.

    IMGUI_API ImGuiID       GetID(const char* str_id);                                      // calculate unique ID (hash of whole ID stack + given parameter). e.g. if you want to query into ImGuiStorage yourself

    IMGUI_API ImGuiID       GetID(const char* str_id_begin, const char* str_id_end);

    IMGUI_API ImGuiID       GetID(const void* ptr_id);

    IMGUI_API ImGuiID       GetID(int int_id);

    // Widgets: Text

    IMGUI_API void          TextUnformatted(const char* text, const char* text_end = NULL); // raw text without formatting. Roughly equivalent to Text("%s", text) but: A) doesn't require null terminated string if 'text_end' is specified, B) it's faster, no memory copy is done, no buffer size limits, recommended for long chunks of text.

    IMGUI_API void          Text(const char* fmt, ...)                                      IM_FMTARGS(1); // formatted text

    IMGUI_API void          TextV(const char* fmt, va_list args)                            IM_FMTLIST(1);

    IMGUI_API void          TextColored(const ImVec4& col, const char* fmt, ...)            IM_FMTARGS(2); // shortcut for PushStyleColor(ImGuiCol_Text, col); Text(fmt, ...); PopStyleColor();

    IMGUI_API void          TextColoredV(const ImVec4& col, const char* fmt, va_list args)  IM_FMTLIST(2);

    IMGUI_API void          TextDisabled(const char* fmt, ...)                              IM_FMTARGS(1); // shortcut for PushStyleColor(ImGuiCol_Text, style.Colors[ImGuiCol_TextDisabled]); Text(fmt, ...); PopStyleColor();

    IMGUI_API void          TextDisabledV(const char* fmt, va_list args)                    IM_FMTLIST(1);

    IMGUI_API void          TextWrapped(const char* fmt, ...)                               IM_FMTARGS(1); // shortcut for PushTextWrapPos(0.0f); Text(fmt, ...); PopTextWrapPos();. Note that this won't work on an auto-resizing window if there's no other widgets to extend the window width, yoy may need to set a size using SetNextWindowSize().

    IMGUI_API void          TextWrappedV(const char* fmt, va_list args)                     IM_FMTLIST(1);

    IMGUI_API void          LabelText(const char* label, const char* fmt, ...)              IM_FMTARGS(2); // display text+label aligned the same way as value+label widgets

    IMGUI_API void          LabelTextV(const char* label, const char* fmt, va_list args)    IM_FMTLIST(2);

    IMGUI_API void          BulletText(const char* fmt, ...)                                IM_FMTARGS(1); // shortcut for Bullet()+Text()

    IMGUI_API void          BulletTextV(const char* fmt, va_list args)                      IM_FMTLIST(1);

    IMGUI_API void          SeparatorText(const char* label);                               // currently: formatted text with an horizontal line

    // Widgets: Main

    // - Most widgets return true when the value has been changed or when pressed/selected

    // - You may also use one of the many IsItemXXX functions (e.g. IsItemActive, IsItemHovered, etc.) to query widget state.

    IMGUI_API bool          Button(const char* label, const ImVec2& size = ImVec2(0, 0));   // button

    IMGUI_API bool          SmallButton(const char* label);                                 // button with (FramePadding.y == 0) to easily embed within text

    IMGUI_API bool          InvisibleButton(const char* str_id, const ImVec2& size, ImGuiButtonFlags flags = 0); // flexible button behavior without the visuals, frequently useful to build custom behaviors using the public api (along with IsItemActive, IsItemHovered, etc.)

    IMGUI_API bool          ArrowButton(const char* str_id, ImGuiDir dir);                  // square button with an arrow shape

    IMGUI_API bool          Checkbox(const char* label, bool* v);

    IMGUI_API bool          CheckboxFlags(const char* label, int* flags, int flags_value);

    IMGUI_API bool          CheckboxFlags(const char* label, unsigned int* flags, unsigned int flags_value);

    IMGUI_API bool          RadioButton(const char* label, bool active);                    // use with e.g. if (RadioButton("one", my_value==1)) { my_value = 1; }

    IMGUI_API bool          RadioButton(const char* label, int* v, int v_button);           // shortcut to handle the above pattern when value is an integer

    IMGUI_API void          ProgressBar(float fraction, const ImVec2& size_arg = ImVec2(-FLT_MIN, 0), const char* overlay = NULL);

    IMGUI_API void          Bullet();                                                       // draw a small circle + keep the cursor on the same line. advance cursor x position by GetTreeNodeToLabelSpacing(), same distance that TreeNode() uses

    IMGUI_API bool          TextLink(const char* label);                                    // hyperlink text button, return true when clicked

    IMGUI_API void          TextLinkOpenURL(const char* label, const char* url = NULL);     // hyperlink text button, automatically open file/url when clicked

    // Widgets: Images

    // - Read about ImTextureID here: https://github.com/ocornut/imgui/wiki/Image-Loading-and-Displaying-Examples

    // - 'uv0' and 'uv1' are texture coordinates. Read about them from the same link above.

    // - Note that Image() may add +2.0f to provided size if a border is visible, ImageButton() adds style.FramePadding*2.0f to provided size.

    IMGUI_API void          Image(ImTextureID user_texture_id, const ImVec2& image_size, const ImVec2& uv0 = ImVec2(0, 0), const ImVec2& uv1 = ImVec2(1, 1), const ImVec4& tint_col = ImVec4(1, 1, 1, 1), const ImVec4& border_col = ImVec4(0, 0, 0, 0));

    IMGUI_API bool          ImageButton(const char* str_id, ImTextureID user_texture_id, const ImVec2& image_size, const ImVec2& uv0 = ImVec2(0, 0), const ImVec2& uv1 = ImVec2(1, 1), const ImVec4& bg_col = ImVec4(0, 0, 0, 0), const ImVec4& tint_col = ImVec4(1, 1, 1, 1));

    // Widgets: Combo Box (Dropdown)

    // - The BeginCombo()/EndCombo() api allows you to manage your contents and selection state however you want it, by creating e.g. Selectable() items.

    // - The old Combo() api are helpers over BeginCombo()/EndCombo() which are kept available for convenience purpose. This is analogous to how ListBox are created.

    IMGUI_API bool          BeginCombo(const char* label, const char* preview_value, ImGuiComboFlags flags = 0);

    IMGUI_API void          EndCombo(); // only call EndCombo() if BeginCombo() returns true!

    IMGUI_API bool          Combo(const char* label, int* current_item, const char* const items[], int items_count, int popup_max_height_in_items = -1);

    IMGUI_API bool          Combo(const char* label, int* current_item, const char* items_separated_by_zeros, int popup_max_height_in_items = -1);      // Separate items with \0 within a string, end item-list with \0\0. e.g. "One\0Two\0Three\0"

    IMGUI_API bool          Combo(const char* label, int* current_item, const char* (*getter)(void* user_data, int idx), void* user_data, int items_count, int popup_max_height_in_items = -1);

    // Widgets: Drag Sliders

    // - CTRL+Click on any drag box to turn them into an input box. Manually input values aren't clamped by default and can go off-bounds. Use ImGuiSliderFlags_AlwaysClamp to always clamp.

    // - For all the Float2/Float3/Float4/Int2/Int3/Int4 versions of every function, note that a 'float v[X]' function argument is the same as 'float* v',

    //   the array syntax is just a way to document the number of elements that are expected to be accessible. You can pass address of your first element out of a contiguous set, e.g. &myvector.x

    // - Adjust format string to decorate the value with a prefix, a suffix, or adapt the editing and display precision e.g. "%.3f" -> 1.234; "%5.2f secs" -> 01.23 secs; "Biscuit: %.0f" -> Biscuit: 1; etc.

    // - Format string may also be set to NULL or use the default format ("%f" or "%d").

    // - Speed are per-pixel of mouse movement (v_speed=0.2f: mouse needs to move by 5 pixels to increase value by 1). For keyboard/gamepad navigation, minimum speed is Max(v_speed, minimum_step_at_given_precision).

    // - Use v_min < v_max to clamp edits to given limits. Note that CTRL+Click manual input can override those limits if ImGuiSliderFlags_AlwaysClamp is not used.

    // - Use v_max = FLT_MAX / INT_MAX etc to avoid clamping to a maximum, same with v_min = -FLT_MAX / INT_MIN to avoid clamping to a minimum.

    // - We use the same sets of flags for DragXXX() and SliderXXX() functions as the features are the same and it makes it easier to swap them.

    // - Legacy: Pre-1.78 there are DragXXX() function signatures that take a final `float power=1.0f' argument instead of the `ImGuiSliderFlags flags=0' argument.

    //   If you get a warning converting a float to ImGuiSliderFlags, read https://github.com/ocornut/imgui/issues/3361

    IMGUI_API bool          DragFloat(const char* label, float* v, float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", ImGuiSliderFlags flags = 0);     // If v_min >= v_max we have no bound

    IMGUI_API bool          DragFloat2(const char* label, float v[2], float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          DragFloat3(const char* label, float v[3], float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          DragFloat4(const char* label, float v[4], float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          DragFloatRange2(const char* label, float* v_current_min, float* v_current_max, float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", const char* format_max = NULL, ImGuiSliderFlags flags = 0);

    IMGUI_API bool          DragInt(const char* label, int* v, float v_speed = 1.0f, int v_min = 0, int v_max = 0, const char* format = "%d", ImGuiSliderFlags flags = 0);  // If v_min >= v_max we have no bound

    IMGUI_API bool          DragInt2(const char* label, int v[2], float v_speed = 1.0f, int v_min = 0, int v_max = 0, const char* format = "%d", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          DragInt3(const char* label, int v[3], float v_speed = 1.0f, int v_min = 0, int v_max = 0, const char* format = "%d", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          DragInt4(const char* label, int v[4], float v_speed = 1.0f, int v_min = 0, int v_max = 0, const char* format = "%d", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          DragIntRange2(const char* label, int* v_current_min, int* v_current_max, float v_speed = 1.0f, int v_min = 0, int v_max = 0, const char* format = "%d", const char* format_max = NULL, ImGuiSliderFlags flags = 0);

    IMGUI_API bool          DragScalar(const char* label, ImGuiDataType data_type, void* p_data, float v_speed = 1.0f, const void* p_min = NULL, const void* p_max = NULL, const char* format = NULL, ImGuiSliderFlags flags = 0);

    IMGUI_API bool          DragScalarN(const char* label, ImGuiDataType data_type, void* p_data, int components, float v_speed = 1.0f, const void* p_min = NULL, const void* p_max = NULL, const char* format = NULL, ImGuiSliderFlags flags = 0);

    // Widgets: Regular Sliders

    // - CTRL+Click on any slider to turn them into an input box. Manually input values aren't clamped by default and can go off-bounds. Use ImGuiSliderFlags_AlwaysClamp to always clamp.

    // - Adjust format string to decorate the value with a prefix, a suffix, or adapt the editing and display precision e.g. "%.3f" -> 1.234; "%5.2f secs" -> 01.23 secs; "Biscuit: %.0f" -> Biscuit: 1; etc.

    // - Format string may also be set to NULL or use the default format ("%f" or "%d").

    // - Legacy: Pre-1.78 there are SliderXXX() function signatures that take a final `float power=1.0f' argument instead of the `ImGuiSliderFlags flags=0' argument.

    //   If you get a warning converting a float to ImGuiSliderFlags, read https://github.com/ocornut/imgui/issues/3361

    IMGUI_API bool          SliderFloat(const char* label, float* v, float v_min, float v_max, const char* format = "%.3f", ImGuiSliderFlags flags = 0);     // adjust format to decorate the value with a prefix or a suffix for in-slider labels or unit display.

    IMGUI_API bool          SliderFloat2(const char* label, float v[2], float v_min, float v_max, const char* format = "%.3f", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          SliderFloat3(const char* label, float v[3], float v_min, float v_max, const char* format = "%.3f", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          SliderFloat4(const char* label, float v[4], float v_min, float v_max, const char* format = "%.3f", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          SliderAngle(const char* label, float* v_rad, float v_degrees_min = -360.0f, float v_degrees_max = +360.0f, const char* format = "%.0f deg", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          SliderInt(const char* label, int* v, int v_min, int v_max, const char* format = "%d", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          SliderInt2(const char* label, int v[2], int v_min, int v_max, const char* format = "%d", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          SliderInt3(const char* label, int v[3], int v_min, int v_max, const char* format = "%d", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          SliderInt4(const char* label, int v[4], int v_min, int v_max, const char* format = "%d", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          SliderScalar(const char* label, ImGuiDataType data_type, void* p_data, const void* p_min, const void* p_max, const char* format = NULL, ImGuiSliderFlags flags = 0);

    IMGUI_API bool          SliderScalarN(const char* label, ImGuiDataType data_type, void* p_data, int components, const void* p_min, const void* p_max, const char* format = NULL, ImGuiSliderFlags flags = 0);

    IMGUI_API bool          VSliderFloat(const char* label, const ImVec2& size, float* v, float v_min, float v_max, const char* format = "%.3f", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          VSliderInt(const char* label, const ImVec2& size, int* v, int v_min, int v_max, const char* format = "%d", ImGuiSliderFlags flags = 0);

    IMGUI_API bool          VSliderScalar(const char* label, const ImVec2& size, ImGuiDataType data_type, void* p_data, const void* p_min, const void* p_max, const char* format = NULL, ImGuiSliderFlags flags = 0);

    // Widgets: Input with Keyboard

    // - If you want to use InputText() with std::string or any custom dynamic string type, see misc/cpp/imgui_stdlib.h and comments in imgui_demo.cpp.

    // - Most of the ImGuiInputTextFlags flags are only useful for InputText() and not for InputFloatX, InputIntX, InputDouble etc.

    IMGUI_API bool          InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);

    IMGUI_API bool          InputTextMultiline(const char* label, char* buf, size_t buf_size, const ImVec2& size = ImVec2(0, 0), ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);

    IMGUI_API bool          InputTextWithHint(const char* label, const char* hint, char* buf, size_t buf_size, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);

    IMGUI_API bool          InputFloat(const char* label, float* v, float step = 0.0f, float step_fast = 0.0f, const char* format = "%.3f", ImGuiInputTextFlags flags = 0);

    IMGUI_API bool          InputFloat2(const char* label, float v[2], const char* format = "%.3f", ImGuiInputTextFlags flags = 0);

    IMGUI_API bool          InputFloat3(const char* label, float v[3], const char* format = "%.3f", ImGuiInputTextFlags flags = 0);

    IMGUI_API bool          InputFloat4(const char* label, float v[4], const char* format = "%.3f", ImGuiInputTextFlags flags = 0);

    IMGUI_API bool          InputInt(const char* label, int* v, int step = 1, int step_fast = 100, ImGuiInputTextFlags flags = 0);

    IMGUI_API bool          InputInt2(const char* label, int v[2], ImGuiInputTextFlags flags = 0);

    IMGUI_API bool          InputInt3(const char* label, int v[3], ImGuiInputTextFlags flags = 0);

    IMGUI_API bool          InputInt4(const char* label, int v[4], ImGuiInputTextFlags flags = 0);

    IMGUI_API bool          InputDouble(const char* label, double* v, double step = 0.0, double step_fast = 0.0, const char* format = "%.6f", ImGuiInputTextFlags flags = 0);

    IMGUI_API bool          InputScalar(const char* label, ImGuiDataType data_type, void* p_data, const void* p_step = NULL, const void* p_step_fast = NULL, const char* format = NULL, ImGuiInputTextFlags flags = 0);

    IMGUI_API bool          InputScalarN(const char* label, ImGuiDataType data_type, void* p_data, int components, const void* p_step = NULL, const void* p_step_fast = NULL, const char* format = NULL, ImGuiInputTextFlags flags = 0);

    // Widgets: Color Editor/Picker (tip: the ColorEdit* functions have a little color square that can be left-clicked to open a picker, and right-clicked to open an option menu.)

    // - Note that in C++ a 'float v[X]' function argument is the _same_ as 'float* v', the array syntax is just a way to document the number of elements that are expected to be accessible.

    // - You can pass the address of a first float element out of a contiguous structure, e.g. &myvector.x

    IMGUI_API bool          ColorEdit3(const char* label, float col[3], ImGuiColorEditFlags flags = 0);

    IMGUI_API bool          ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flags = 0);

    IMGUI_API bool          ColorPicker3(const char* label, float col[3], ImGuiColorEditFlags flags = 0);

    IMGUI_API bool          ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags flags = 0, const float* ref_col = NULL);

    IMGUI_API bool          ColorButton(const char* desc_id, const ImVec4& col, ImGuiColorEditFlags flags = 0, const ImVec2& size = ImVec2(0, 0)); // display a color square/button, hover for details, return true when pressed.

    IMGUI_API void          SetColorEditOptions(ImGuiColorEditFlags flags);                     // initialize current options (generally on application startup) if you want to select a default format, picker type, etc. User will be able to change many settings, unless you pass the _NoOptions flag to your calls.

    // Widgets: Trees

    // - TreeNode functions return true when the node is open, in which case you need to also call TreePop() when you are finished displaying the tree node contents.

    IMGUI_API bool          TreeNode(const char* label);

    IMGUI_API bool          TreeNode(const char* str_id, const char* fmt, ...) IM_FMTARGS(2);   // helper variation to easily decorelate the id from the displayed string. Read the FAQ about why and how to use ID. to align arbitrary text at the same level as a TreeNode() you can use Bullet().

    IMGUI_API bool          TreeNode(const void* ptr_id, const char* fmt, ...) IM_FMTARGS(2);   // "

    IMGUI_API bool          TreeNodeV(const char* str_id, const char* fmt, va_list args) IM_FMTLIST(2);

    IMGUI_API bool          TreeNodeV(const void* ptr_id, const char* fmt, va_list args) IM_FMTLIST(2);

    IMGUI_API bool          TreeNodeEx(const char* label, ImGuiTreeNodeFlags flags = 0);

    IMGUI_API bool          TreeNodeEx(const char* str_id, ImGuiTreeNodeFlags flags, const char* fmt, ...) IM_FMTARGS(3);

    IMGUI_API bool          TreeNodeEx(const void* ptr_id, ImGuiTreeNodeFlags flags, const char* fmt, ...) IM_FMTARGS(3);

    IMGUI_API bool          TreeNodeExV(const char* str_id, ImGuiTreeNodeFlags flags, const char* fmt, va_list args) IM_FMTLIST(3);

    IMGUI_API bool          TreeNodeExV(const void* ptr_id, ImGuiTreeNodeFlags flags, const char* fmt, va_list args) IM_FMTLIST(3);

    IMGUI_API void          TreePush(const char* str_id);                                       // ~ Indent()+PushID(). Already called by TreeNode() when returning true, but you can call TreePush/TreePop yourself if desired.

    IMGUI_API void          TreePush(const void* ptr_id);                                       // "

    IMGUI_API void          TreePop();                                                          // ~ Unindent()+PopID()

    IMGUI_API float         GetTreeNodeToLabelSpacing();                                        // horizontal distance preceding label when using TreeNode*() or Bullet() == (g.FontSize + style.FramePadding.x*2) for a regular unframed TreeNode

    IMGUI_API bool          CollapsingHeader(const char* label, ImGuiTreeNodeFlags flags = 0);  // if returning 'true' the header is open. doesn't indent nor push on ID stack. user doesn't have to call TreePop().

    IMGUI_API bool          CollapsingHeader(const char* label, bool* p_visible, ImGuiTreeNodeFlags flags = 0); // when 'p_visible != NULL': if '*p_visible==true' display an additional small close button on upper right of the header which will set the bool to false when clicked, if '*p_visible==false' don't display the header.

    IMGUI_API void          SetNextItemOpen(bool is_open, ImGuiCond cond = 0);                  // set next TreeNode/CollapsingHeader open state.

    IMGUI_API void          SetNextItemStorageID(ImGuiID storage_id);                           // set id to use for open/close storage (default to same as item id).

    // Widgets: Selectables

    // - A selectable highlights when hovered, and can display another color when selected.

    // - Neighbors selectable extend their highlight bounds in order to leave no gap between them. This is so a series of selected Selectable appear contiguous.

    IMGUI_API bool          Selectable(const char* label, bool selected = false, ImGuiSelectableFlags flags = 0, const ImVec2& size = ImVec2(0, 0)); // "bool selected" carry the selection state (read-only). Selectable() is clicked is returns true so you can modify your selection state. size.x==0.0: use remaining width, size.x>0.0: specify width. size.y==0.0: use label height, size.y>0.0: specify height

    IMGUI_API bool          Selectable(const char* label, bool* p_selected, ImGuiSelectableFlags flags = 0, const ImVec2& size = ImVec2(0, 0));      // "bool* p_selected" point to the selection state (read-write), as a convenient helper.

    // Multi-selection system for Selectable(), Checkbox(), TreeNode() functions [BETA]

    // - This enables standard multi-selection/range-selection idioms (CTRL+Mouse/Keyboard, SHIFT+Mouse/Keyboard, etc.) in a way that also allow a clipper to be used.

    // - ImGuiSelectionUserData is often used to store your item index within the current view (but may store something else).

    // - Read comments near ImGuiMultiSelectIO for instructions/details and see 'Demo->Widgets->Selection State & Multi-Select' for demo.

    // - TreeNode() is technically supported but... using this correctly is more complicated. You need some sort of linear/random access to your tree,

    //   which is suited to advanced trees setups already implementing filters and clipper. We will work simplifying the current demo.

    // - 'selection_size' and 'items_count' parameters are optional and used by a few features. If they are costly for you to compute, you may avoid them.

    IMGUI_API ImGuiMultiSelectIO*   BeginMultiSelect(ImGuiMultiSelectFlags flags, int selection_size = -1, int items_count = -1);

    IMGUI_API ImGuiMultiSelectIO*   EndMultiSelect();

    IMGUI_API void                  SetNextItemSelectionUserData(ImGuiSelectionUserData selection_user_data);

    IMGUI_API bool                  IsItemToggledSelection();                                   // Was the last item selection state toggled? Useful if you need the per-item information _before_ reaching EndMultiSelect(). We only returns toggle _event_ in order to handle clipping correctly.

    // Widgets: List Boxes

    // - This is essentially a thin wrapper to using BeginChild/EndChild with the ImGuiChildFlags_FrameStyle flag for stylistic changes + displaying a label.

    // - You can submit contents and manage your selection state however you want it, by creating e.g. Selectable() or any other items.

    // - The simplified/old ListBox() api are helpers over BeginListBox()/EndListBox() which are kept available for convenience purpose. This is analoguous to how Combos are created.

    // - Choose frame width:   size.x > 0.0f: custom  /  size.x < 0.0f or -FLT_MIN: right-align   /  size.x = 0.0f (default): use current ItemWidth

    // - Choose frame height:  size.y > 0.0f: custom  /  size.y < 0.0f or -FLT_MIN: bottom-align  /  size.y = 0.0f (default): arbitrary default height which can fit ~7 items

    IMGUI_API bool          BeginListBox(const char* label, const ImVec2& size = ImVec2(0, 0)); // open a framed scrolling region

    IMGUI_API void          EndListBox();                                                       // only call EndListBox() if BeginListBox() returned true!

    IMGUI_API bool          ListBox(const char* label, int* current_item, const char* const items[], int items_count, int height_in_items = -1);

    IMGUI_API bool          ListBox(const char* label, int* current_item, const char* (*getter)(void* user_data, int idx), void* user_data, int items_count, int height_in_items = -1);

    // Widgets: Data Plotting

    // - Consider using ImPlot (https://github.com/epezent/implot) which is much better!

    IMGUI_API void          PlotLines(const char* label, const float* values, int values_count, int values_offset = 0, const char* overlay_text = NULL, float scale_min = FLT_MAX, float scale_max = FLT_MAX, ImVec2 graph_size = ImVec2(0, 0), int stride = sizeof(float));

    IMGUI_API void          PlotLines(const char* label, float(*values_getter)(void* data, int idx), void* data, int values_count, int values_offset = 0, const char* overlay_text = NULL, float scale_min = FLT_MAX, float scale_max = FLT_MAX, ImVec2 graph_size = ImVec2(0, 0));

    IMGUI_API void          PlotHistogram(const char* label, const float* values, int values_count, int values_offset = 0, const char* overlay_text = NULL, float scale_min = FLT_MAX, float scale_max = FLT_MAX, ImVec2 graph_size = ImVec2(0, 0), int stride = sizeof(float));

    IMGUI_API void          PlotHistogram(const char* label, float (*values_getter)(void* data, int idx), void* data, int values_count, int values_offset = 0, const char* overlay_text = NULL, float scale_min = FLT_MAX, float scale_max = FLT_MAX, ImVec2 graph_size = ImVec2(0, 0));

    // Widgets: Value() Helpers.

    // - Those are merely shortcut to calling Text() with a format string. Output single value in "name: value" format (tip: freely declare more in your code to handle your types. you can add functions to the ImGui namespace)

    IMGUI_API void          Value(const char* prefix, bool b);

    IMGUI_API void          Value(const char* prefix, int v);

    IMGUI_API void          Value(const char* prefix, unsigned int v);

    IMGUI_API void          Value(const char* prefix, float v, const char* float_format = NULL);

    // Widgets: Menus

    // - Use BeginMenuBar() on a window ImGuiWindowFlags_MenuBar to append to its menu bar.

    // - Use BeginMainMenuBar() to create a menu bar at the top of the screen and append to it.

    // - Use BeginMenu() to create a menu. You can call BeginMenu() multiple time with the same identifier to append more items to it.

    // - Not that MenuItem() keyboardshortcuts are displayed as a convenience but _not processed_ by Dear ImGui at the moment.

    IMGUI_API bool          BeginMenuBar();                                                     // append to menu-bar of current window (requires ImGuiWindowFlags_MenuBar flag set on parent window).

    IMGUI_API void          EndMenuBar();                                                       // only call EndMenuBar() if BeginMenuBar() returns true!

    IMGUI_API bool          BeginMainMenuBar();                                                 // create and append to a full screen menu-bar.

    IMGUI_API void          EndMainMenuBar();                                                   // only call EndMainMenuBar() if BeginMainMenuBar() returns true!

    IMGUI_API bool          BeginMenu(const char* label, bool enabled = true);                  // create a sub-menu entry. only call EndMenu() if this returns true!

    IMGUI_API void          EndMenu();                                                          // only call EndMenu() if BeginMenu() returns true!

    IMGUI_API bool          MenuItem(const char* label, const char* shortcut = NULL, bool selected = false, bool enabled = true);  // return true when activated.

    IMGUI_API bool          MenuItem(const char* label, const char* shortcut, bool* p_selected, bool enabled = true);              // return true when activated + toggle (*p_selected) if p_selected != NULL

    // Tooltips

    // - Tooltips are windows following the mouse. They do not take focus away.

    // - A tooltip window can contain items of any types.

    // - SetTooltip() is more or less a shortcut for the 'if (BeginTooltip()) { Text(...); EndTooltip(); }' idiom (with a subtlety that it discard any previously submitted tooltip)

    IMGUI_API bool          BeginTooltip();                                                     // begin/append a tooltip window.

    IMGUI_API void          EndTooltip();                                                       // only call EndTooltip() if BeginTooltip()/BeginItemTooltip() returns true!

    IMGUI_API void          SetTooltip(const char* fmt, ...) IM_FMTARGS(1);                     // set a text-only tooltip. Often used after a ImGui::IsItemHovered() check. Override any previous call to SetTooltip().

    IMGUI_API void          SetTooltipV(const char* fmt, va_list args) IM_FMTLIST(1);

    // Tooltips: helpers for showing a tooltip when hovering an item

    // - BeginItemTooltip() is a shortcut for the 'if (IsItemHovered(ImGuiHoveredFlags_ForTooltip) && BeginTooltip())' idiom.

    // - SetItemTooltip() is a shortcut for the 'if (IsItemHovered(ImGuiHoveredFlags_ForTooltip)) { SetTooltip(...); }' idiom.

    // - Where 'ImGuiHoveredFlags_ForTooltip' itself is a shortcut to use 'style.HoverFlagsForTooltipMouse' or 'style.HoverFlagsForTooltipNav' depending on active input type. For mouse it defaults to 'ImGuiHoveredFlags_Stationary | ImGuiHoveredFlags_DelayShort'.

    IMGUI_API bool          BeginItemTooltip();                                                 // begin/append a tooltip window if preceding item was hovered.

    IMGUI_API void          SetItemTooltip(const char* fmt, ...) IM_FMTARGS(1);                 // set a text-only tooltip if preceding item was hovered. override any previous call to SetTooltip().

    IMGUI_API void          SetItemTooltipV(const char* fmt, va_list args) IM_FMTLIST(1);

    // Popups, Modals

    //  - They block normal mouse hovering detection (and therefore most mouse interactions) behind them.

    //  - If not modal: they can be closed by clicking anywhere outside them, or by pressing ESCAPE.

    //  - Their visibility state (~bool) is held internally instead of being held by the programmer as we are used to with regular Begin*() calls.

    //  - The 3 properties above are related: we need to retain popup visibility state in the library because popups may be closed as any time.

    //  - You can bypass the hovering restriction by using ImGuiHoveredFlags_AllowWhenBlockedByPopup when calling IsItemHovered() or IsWindowHovered().

    //  - IMPORTANT: Popup identifiers are relative to the current ID stack, so OpenPopup and BeginPopup generally needs to be at the same level of the stack.

    //    This is sometimes leading to confusing mistakes. May rework this in the future.

    //  - BeginPopup(): query popup state, if open start appending into the window. Call EndPopup() afterwards if returned true. ImGuiWindowFlags are forwarded to the window.

    //  - BeginPopupModal(): block every interaction behind the window, cannot be closed by user, add a dimming background, has a title bar.

    IMGUI_API bool          BeginPopup(const char* str_id, ImGuiWindowFlags flags = 0);                         // return true if the popup is open, and you can start outputting to it.

    IMGUI_API bool          BeginPopupModal(const char* name, bool* p_open = NULL, ImGuiWindowFlags flags = 0); // return true if the modal is open, and you can start outputting to it.

    IMGUI_API void          EndPopup();                                                                         // only call EndPopup() if BeginPopupXXX() returns true!

    // Popups: open/close functions

    //  - OpenPopup(): set popup state to open. ImGuiPopupFlags are available for opening options.

    //  - If not modal: they can be closed by clicking anywhere outside them, or by pressing ESCAPE.

    //  - CloseCurrentPopup(): use inside the BeginPopup()/EndPopup() scope to close manually.

    //  - CloseCurrentPopup() is called by default by Selectable()/MenuItem() when activated (FIXME: need some options).

    //  - Use ImGuiPopupFlags_NoOpenOverExistingPopup to avoid opening a popup if there's already one at the same level. This is equivalent to e.g. testing for !IsAnyPopupOpen() prior to OpenPopup().

    //  - Use IsWindowAppearing() after BeginPopup() to tell if a window just opened.

    //  - IMPORTANT: Notice that for OpenPopupOnItemClick() we exceptionally default flags to 1 (== ImGuiPopupFlags_MouseButtonRight) for backward compatibility with older API taking 'int mouse_button = 1' parameter

    IMGUI_API void          OpenPopup(const char* str_id, ImGuiPopupFlags popup_flags = 0);                     // call to mark popup as open (don't call every frame!).

    IMGUI_API void          OpenPopup(ImGuiID id, ImGuiPopupFlags popup_flags = 0);                             // id overload to facilitate calling from nested stacks

    IMGUI_API void          OpenPopupOnItemClick(const char* str_id = NULL, ImGuiPopupFlags popup_flags = 1);   // helper to open popup when clicked on last item. Default to ImGuiPopupFlags_MouseButtonRight == 1. (note: actually triggers on the mouse _released_ event to be consistent with popup behaviors)

    IMGUI_API void          CloseCurrentPopup();                                                                // manually close the popup we have begin-ed into.

    // Popups: open+begin combined functions helpers

    //  - Helpers to do OpenPopup+BeginPopup where the Open action is triggered by e.g. hovering an item and right-clicking.

    //  - They are convenient to easily create context menus, hence the name.

    //  - IMPORTANT: Notice that BeginPopupContextXXX takes ImGuiPopupFlags just like OpenPopup() and unlike BeginPopup(). For full consistency, we may add ImGuiWindowFlags to the BeginPopupContextXXX functions in the future.

    //  - IMPORTANT: Notice that we exceptionally default their flags to 1 (== ImGuiPopupFlags_MouseButtonRight) for backward compatibility with older API taking 'int mouse_button = 1' parameter, so if you add other flags remember to re-add the ImGuiPopupFlags_MouseButtonRight.

    IMGUI_API bool          BeginPopupContextItem(const char* str_id = NULL, ImGuiPopupFlags popup_flags = 1);  // open+begin popup when clicked on last item. Use str_id==NULL to associate the popup to previous item. If you want to use that on a non-interactive item such as Text() you need to pass in an explicit ID here. read comments in .cpp!

    IMGUI_API bool          BeginPopupContextWindow(const char* str_id = NULL, ImGuiPopupFlags popup_flags = 1);// open+begin popup when clicked on current window.

    IMGUI_API bool          BeginPopupContextVoid(const char* str_id = NULL, ImGuiPopupFlags popup_flags = 1);  // open+begin popup when clicked in void (where there are no windows).

    // Popups: query functions

    //  - IsPopupOpen(): return true if the popup is open at the current BeginPopup() level of the popup stack.

    //  - IsPopupOpen() with ImGuiPopupFlags_AnyPopupId: return true if any popup is open at the current BeginPopup() level of the popup stack.

    //  - IsPopupOpen() with ImGuiPopupFlags_AnyPopupId + ImGuiPopupFlags_AnyPopupLevel: return true if any popup is open.

    IMGUI_API bool          IsPopupOpen(const char* str_id, ImGuiPopupFlags flags = 0);                         // return true if the popup is open.

    // Tables

    // - Full-featured replacement for old Columns API.

    // - See Demo->Tables for demo code. See top of imgui_tables.cpp for general commentary.

    // - See ImGuiTableFlags_ and ImGuiTableColumnFlags_ enums for a description of available flags.

    // The typical call flow is:

    // - 1. Call BeginTable(), early out if returning false.

    // - 2. Optionally call TableSetupColumn() to submit column name/flags/defaults.

    // - 3. Optionally call TableSetupScrollFreeze() to request scroll freezing of columns/rows.

    // - 4. Optionally call TableHeadersRow() to submit a header row. Names are pulled from TableSetupColumn() data.

    // - 5. Populate contents:

    //    - In most situations you can use TableNextRow() + TableSetColumnIndex(N) to start appending into a column.

    //    - If you are using tables as a sort of grid, where every column is holding the same type of contents,

    //      you may prefer using TableNextColumn() instead of TableNextRow() + TableSetColumnIndex().

    //      TableNextColumn() will automatically wrap-around into the next row if needed.

    //    - IMPORTANT: Comparatively to the old Columns() API, we need to call TableNextColumn() for the first column!

    //    - Summary of possible call flow:

    //        - TableNextRow() -> TableSetColumnIndex(0) -> Text("Hello 0") -> TableSetColumnIndex(1) -> Text("Hello 1")  // OK

    //        - TableNextRow() -> TableNextColumn()      -> Text("Hello 0") -> TableNextColumn()      -> Text("Hello 1")  // OK

    //        -                   TableNextColumn()      -> Text("Hello 0") -> TableNextColumn()      -> Text("Hello 1")  // OK: TableNextColumn() automatically gets to next row!

    //        - TableNextRow()                           -> Text("Hello 0")                                               // Not OK! Missing TableSetColumnIndex() or TableNextColumn()! Text will not appear!

    // - 5. Call EndTable()

    IMGUI_API bool          BeginTable(const char* str_id, int columns, ImGuiTableFlags flags = 0, const ImVec2& outer_size = ImVec2(0.0f, 0.0f), float inner_width = 0.0f);

    IMGUI_API void          EndTable();                                         // only call EndTable() if BeginTable() returns true!

    IMGUI_API void          TableNextRow(ImGuiTableRowFlags row_flags = 0, float min_row_height = 0.0f); // append into the first cell of a new row.

    IMGUI_API bool          TableNextColumn();                                  // append into the next column (or first column of next row if currently in last column). Return true when column is visible.

    IMGUI_API bool          TableSetColumnIndex(int column_n);                  // append into the specified column. Return true when column is visible.

    // Tables: Headers & Columns declaration

    // - Use TableSetupColumn() to specify label, resizing policy, default width/weight, id, various other flags etc.

    // - Use TableHeadersRow() to create a header row and automatically submit a TableHeader() for each column.

    //   Headers are required to perform: reordering, sorting, and opening the context menu.

    //   The context menu can also be made available in columns body using ImGuiTableFlags_ContextMenuInBody.

    // - You may manually submit headers using TableNextRow() + TableHeader() calls, but this is only useful in

    //   some advanced use cases (e.g. adding custom widgets in header row).

    // - Use TableSetupScrollFreeze() to lock columns/rows so they stay visible when scrolled.

    IMGUI_API void          TableSetupColumn(const char* label, ImGuiTableColumnFlags flags = 0, float init_width_or_weight = 0.0f, ImGuiID user_id = 0);

    IMGUI_API void          TableSetupScrollFreeze(int cols, int rows);         // lock columns/rows so they stay visible when scrolled.

    IMGUI_API void          TableHeader(const char* label);                     // submit one header cell manually (rarely used)

    IMGUI_API void          TableHeadersRow();                                  // submit a row with headers cells based on data provided to TableSetupColumn() + submit context menu

    IMGUI_API void          TableAngledHeadersRow();                            // submit a row with angled headers for every column with the ImGuiTableColumnFlags_AngledHeader flag. MUST BE FIRST ROW.

    // Tables: Sorting & Miscellaneous functions

    // - Sorting: call TableGetSortSpecs() to retrieve latest sort specs for the table. NULL when not sorting.

    //   When 'sort_specs->SpecsDirty == true' you should sort your data. It will be true when sorting specs have

    //   changed since last call, or the first time. Make sure to set 'SpecsDirty = false' after sorting,

    //   else you may wastefully sort your data every frame!

    // - Functions args 'int column_n' treat the default value of -1 as the same as passing the current column index.

    IMGUI_API ImGuiTableSortSpecs*  TableGetSortSpecs();                        // get latest sort specs for the table (NULL if not sorting).  Lifetime: don't hold on this pointer over multiple frames or past any subsequent call to BeginTable().

    IMGUI_API int                   TableGetColumnCount();                      // return number of columns (value passed to BeginTable)

    IMGUI_API int                   TableGetColumnIndex();                      // return current column index.

    IMGUI_API int                   TableGetRowIndex();                         // return current row index.

    IMGUI_API const char*           TableGetColumnName(int column_n = -1);      // return "" if column didn't have a name declared by TableSetupColumn(). Pass -1 to use current column.

    IMGUI_API ImGuiTableColumnFlags TableGetColumnFlags(int column_n = -1);     // return column flags so you can query their Enabled/Visible/Sorted/Hovered status flags. Pass -1 to use current column.

    IMGUI_API void                  TableSetColumnEnabled(int column_n, bool v);// change user accessible enabled/disabled state of a column. Set to false to hide the column. User can use the context menu to change this themselves (right-click in headers, or right-click in columns body with ImGuiTableFlags_ContextMenuInBody)

    IMGUI_API int                   TableGetHoveredColumn();                    // return hovered column. return -1 when table is not hovered. return columns_count if the unused space at the right of visible columns is hovered. Can also use (TableGetColumnFlags() & ImGuiTableColumnFlags_IsHovered) instead.

    IMGUI_API void                  TableSetBgColor(ImGuiTableBgTarget target, ImU32 color, int column_n = -1);  // change the color of a cell, row, or column. See ImGuiTableBgTarget_ flags for details.

    // Legacy Columns API (prefer using Tables!)

    // - You can also use SameLine(pos_x) to mimic simplified columns.

    IMGUI_API void          Columns(int count = 1, const char* id = NULL, bool borders = true);

    IMGUI_API void          NextColumn();                                                       // next column, defaults to current row or next row if the current row is finished

    IMGUI_API int           GetColumnIndex();                                                   // get current column index

    IMGUI_API float         GetColumnWidth(int column_index = -1);                              // get column width (in pixels). pass -1 to use current column

    IMGUI_API void          SetColumnWidth(int column_index, float width);                      // set column width (in pixels). pass -1 to use current column

    IMGUI_API float         GetColumnOffset(int column_index = -1);                             // get position of column line (in pixels, from the left side of the contents region). pass -1 to use current column, otherwise 0..GetColumnsCount() inclusive. column 0 is typically 0.0f

    IMGUI_API void          SetColumnOffset(int column_index, float offset_x);                  // set position of column line (in pixels, from the left side of the contents region). pass -1 to use current column

    IMGUI_API int           GetColumnsCount();

    // Tab Bars, Tabs

    // - Note: Tabs are automatically created by the docking system (when in 'docking' branch). Use this to create tab bars/tabs yourself.

    IMGUI_API bool          BeginTabBar(const char* str_id, ImGuiTabBarFlags flags = 0);        // create and append into a TabBar

    IMGUI_API void          EndTabBar();                                                        // only call EndTabBar() if BeginTabBar() returns true!

    IMGUI_API bool          BeginTabItem(const char* label, bool* p_open = NULL, ImGuiTabItemFlags flags = 0); // create a Tab. Returns true if the Tab is selected.

    IMGUI_API void          EndTabItem();                                                       // only call EndTabItem() if BeginTabItem() returns true!

    IMGUI_API bool          TabItemButton(const char* label, ImGuiTabItemFlags flags = 0);      // create a Tab behaving like a button. return true when clicked. cannot be selected in the tab bar.

    IMGUI_API void          SetTabItemClosed(const char* tab_or_docked_window_label);           // notify TabBar or Docking system of a closed tab/window ahead (useful to reduce visual flicker on reorderable tab bars). For tab-bar: call after BeginTabBar() and before Tab submissions. Otherwise call with a window name.

    // Docking

    // [BETA API] Enable with io.ConfigFlags |= ImGuiConfigFlags_DockingEnable.

    // Note: You can use most Docking facilities without calling any API. You DO NOT need to call DockSpace() to use Docking!

    // - Drag from window title bar or their tab to dock/undock. Hold SHIFT to disable docking.

    // - Drag from window menu button (upper-left button) to undock an entire node (all windows).

    // - When io.ConfigDockingWithShift == true, you instead need to hold SHIFT to enable docking.

    // About dockspaces:

    // - Use DockSpaceOverViewport() to create a window covering the screen or a specific viewport + a dockspace inside it.

    //   This is often used with ImGuiDockNodeFlags_PassthruCentralNode to make it transparent.

    // - Use DockSpace() to create an explicit dock node _within_ an existing window. See Docking demo for details.

    // - Important: Dockspaces need to be submitted _before_ any window they can host. Submit it early in your frame!

    // - Important: Dockspaces need to be kept alive if hidden, otherwise windows docked into it will be undocked.

    //   e.g. if you have multiple tabs with a dockspace inside each tab: submit the non-visible dockspaces with ImGuiDockNodeFlags_KeepAliveOnly.

    IMGUI_API ImGuiID       DockSpace(ImGuiID dockspace_id, const ImVec2& size = ImVec2(0, 0), ImGuiDockNodeFlags flags = 0, const ImGuiWindowClass* window_class = NULL);

    IMGUI_API ImGuiID       DockSpaceOverViewport(ImGuiID dockspace_id = 0, const ImGuiViewport* viewport = NULL, ImGuiDockNodeFlags flags = 0, const ImGuiWindowClass* window_class = NULL);