imgui.h

// dear imgui, v1.50 WIP
// (headers)

// See imgui.cpp file for documentation.
// See ImGui::ShowTestWindow() in imgui_demo.cpp for demo code.
// Read 'Programmer guide' in imgui.cpp for notes on how to setup ImGui in your codebase.
// Get latest version at https://github.com/ocornut/imgui

#pragma once

#if !defined(IMGUI_DISABLE_INCLUDE_IMCONFIG_H) || defined(IMGUI_INCLUDE_IMCONFIG_H)
#include "imconfig.h" // User-editable configuration file
#endif
#include <float.h>  // FLT_MAX
#include <stdarg.h> // va_list
#include <stddef.h> // ptrdiff_t, NULL
#include <string.h> // memset, memmove, memcpy, strlen, strchr, strcpy, strcmp

#define IMGUI_VERSION "1.50 WIP"

// Define attributes of all API symbols declarations, e.g. for DLL under Windows.
#ifndef IMGUI_API
#define IMGUI_API
#endif

// Define assertion handler.
#ifndef IM_ASSERT
#include <assert.h>
#define IM_ASSERT(_EXPR) assert(_EXPR)
#endif

// Some compilers support applying printf-style warnings to user functions.
#if defined(__clang__) || defined(__GNUC__)
#define IM_PRINTFARGS(FMT) __attribute__((format(printf, FMT, (FMT + 1))))
#else
#define IM_PRINTFARGS(FMT)
#endif

#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wold-style-cast"
#endif

// Forward declarations
struct ImDrawChannel;                   // Temporary storage for outputting drawing commands out of order, used by ImDrawList::ChannelsSplit()
struct ImDrawCmd;                       // A single draw command within a parent ImDrawList (generally maps to 1 GPU draw call)
struct ImDrawData;                      // All draw command lists required to render the frame
struct ImDrawList;                      // A single draw command list (generally one per window)
struct ImDrawChar;                      // A single vertex (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 font loader
struct ImFontConfig;                    // Configuration data when adding a font or merging fonts
struct ImColor;                         // Helper functions to create a color that can be converted to either u32 or float4
struct ImGuiIO;                         // Main configuration and I/O between your application and ImGui
struct ImGuiOnceUponAFrame;             // Simple helper for running a block of code not more than once a frame, used by IMGUI_ONCE_UPON_A_FRAME macro
struct ImGuiStorage;                    // Simple custom key value storage
struct ImGuiStyle;                      // Runtime data for styling/colors
struct ImGuiTextFilter;                 // Parse and apply text filters. In format "aaaaa[,bbbb][,ccccc]"
struct ImGuiTextBuffer;                 // Text buffer for logging/accumulating text
struct ImGuiTextEditCallbackData;       // Shared state of ImGui::InputText() when using custom ImGuiTextEditCallback (rare/advanced use)
struct ImGuiSizeConstraintCallbackData; // Structure used to constraint window size in custom ways when using custom ImGuiSizeConstraintCallback (rare/advanced use)
struct ImGuiListClipper;                // Helper to manually clip large list of items
struct ImGuiContext;                    // ImGui context (opaque)

// Typedefs and Enumerations (declared as int for compatibility and to not pollute the top of this file)
typedef int            ImI32;                // 32-bit unsigned integer (typically used to store packed colors)
typedef unsigned int   ImU32;                // 32-bit unsigned integer (typically used to store packed colors)
typedef unsigned int   ImGuiID;              // unique ID used by widgets (typically hashed from a stack of string)
typedef unsigned short ImWchar;              // character for keyboard input/display
typedef int            ImGuiCol;             // a color identifier for styling       // enum ImGuiCol_
typedef int            ImGuiStyleVar;        // a variable identifier for styling    // enum ImGuiStyleVar_
typedef int            ImGuiKey;             // a key identifier (ImGui-side enum)   // enum ImGuiKey_
typedef int            ImGuiColorEditMode;   // color edit mode for ColorEdit*()     // enum ImGuiColorEditMode_
typedef int            ImGuiMouseCursor;     // a mouse cursor identifier            // enum ImGuiMouseCursor_
typedef int            ImGuiWindowFlags;     // window flags for Begin*()            // enum ImGuiWindowFlags_
typedef int            ImGuiSetCond;         // condition flags for Set*()           // enum ImGuiSetCond_
typedef int            ImGuiInputTextFlags;  // flags for InputText*()               // enum ImGuiInputTextFlags_
typedef int            ImGuiSelectableFlags; // flags for Selectable()               // enum ImGuiSelectableFlags_
typedef int            ImGuiTreeNodeFlags;   // flags for TreeNode*(), Collapsing*() // enum ImGuiTreeNodeFlags_
typedef int (*ImGuiTextEditCallback)(ImGuiTextEditCallbackData *data);
typedef void (*ImGuiSizeConstraintCallback)(ImGuiSizeConstraintCallbackData *data);

// Others helpers at bottom of the file:
// class ImVector<>                 // Lightweight std::vector like class.
// IMGUI_ONCE_UPON_A_FRAME          // Execute a block of code once per frame only (convenient for creating UI within deep-nested code that runs multiple times)

struct ImVec2 {
    float x, y;
    ImVec2() { x = y = 0.0f; }
    ImVec2(float _x, float _y) {
        x = _x;
        y = _y;
    }
#ifdef IM_VEC2_CLASS_EXTRA // Define constructor and implicit cast operators in imconfig.h to convert back<>forth from your math types and ImVec2.
    IM_VEC2_CLASS_EXTRA
#endif
};

struct ImVec4 {
    float x, y, z, w;
    ImVec4() { x = y = z = w = 0.0f; }
    ImVec4(float _x, float _y, float _z, float _w) {
        x = _x;
        y = _y;
        z = _z;
        w = _w;
    }
#ifdef IM_VEC4_CLASS_EXTRA // Define constructor and implicit cast operators in imconfig.h to convert back<>forth from your math types and ImVec4.
    IM_VEC4_CLASS_EXTRA
#endif
};

// ImGui end-user API
// In a namespace so that user can add extra functions in a separate file (e.g. Value() helpers for your vector or common types)
namespace ImGui {
// Main
IMGUI_API ImGuiIO &GetIO();
IMGUI_API ImGuiStyle &GetStyle();
IMGUI_API ImDrawData *GetDrawData(); // same value as passed to your io.RenderDrawListsFn() function. valid after Render() and until the next call to NewFrame()
IMGUI_API void        NewFrame(); // start a new ImGui frame, you can submit any command from this point until NewFrame()/Render().
IMGUI_API void        Render();   // ends the ImGui frame, finalize rendering data
IMGUI_API void        Shutdown();
IMGUI_API void        ShowUserGuide();                  // help block
IMGUI_API void ShowStyleEditor(ImGuiStyle *ref = NULL); // style editor block. you can pass in a reference ImGuiStyle structure to compare to, revert to and save to (else it uses the default style)
IMGUI_API void ShowTestWindow(bool *p_open = NULL);     // test window demonstrating ImGui features
IMGUI_API void ShowMetricsWindow(bool *p_open = NULL);  // metrics window for debugging ImGui

// Window
IMGUI_API bool Begin(const char *name, bool *p_open = NULL, ImGuiWindowFlags flags = 0);                                                   // push window to the stack and start appending to it. see .cpp for details. return false when window is collapsed, so you can early out in your code. 'bool* p_open' creates a widget on the upper-right to close the window (which sets your bool to false).
IMGUI_API bool Begin(const char *name, bool *p_open, const ImVec2 &size_on_first_use, float bg_alpha = -1.0f, ImGuiWindowFlags flags = 0); // OBSOLETE. this is the older/longer API. the extra parameters aren't very relevant. call SetNextWindowSize() instead if you want to set a window size. For regular windows, 'size_on_first_use' only applies to the first time EVER the window is created and probably not what you want! might obsolete this API eventually.
IMGUI_API void End();                                                                                                                      // finish appending to current window, pop it off the window stack.
IMGUI_API bool BeginChild(const char *str_id, const ImVec2 &size = ImVec2(0, 0), bool border = false, ImGuiWindowFlags extra_flags = 0);   // begin a scrolling region. size==0.0f: use remaining window size, size<0.0f: use remaining window size minus abs(size). size>0.0f: fixed size. each axis can use a different mode, e.g. ImVec2(0,400).
IMGUI_API bool BeginChild(ImGuiID id, const ImVec2 &size = ImVec2(0, 0), bool border = false, ImGuiWindowFlags extra_flags = 0);           // "
IMGUI_API void EndChild();
IMGUI_API ImVec2 GetContentRegionMax();         // current content boundaries (typically window boundaries including scrolling, or current column boundaries), in windows coordinates
IMGUI_API ImVec2 GetContentRegionAvail();       // == GetContentRegionMax() - GetCursorPos()
IMGUI_API float  GetContentRegionAvailWidth();  //
IMGUI_API ImVec2 GetWindowContentRegionMin();   // content boundaries min (roughly (0,0)-Scroll), in window coordinates
IMGUI_API ImVec2 GetWindowContentRegionMax();   // content boundaries max (roughly (0,0)+Size-Scroll) where Size can be override with SetNextWindowContentSize(), in window coordinates
IMGUI_API float  GetWindowContentRegionWidth(); //
IMGUI_API ImDrawList *GetWindowDrawList();      // get rendering command-list if you want to append your own draw primitives
IMGUI_API ImVec2 GetWindowPos();                // get current window position in screen space (useful if you want to do your own drawing via the DrawList api)
IMGUI_API ImVec2 GetWindowSize();               // get current window size
IMGUI_API float  GetWindowWidth();
IMGUI_API float  GetWindowHeight();
IMGUI_API bool   IsWindowCollapsed();

IMGUI_API void SetNextWindowPos(const ImVec2 &pos, ImGuiSetCond cond = 0);                                                                                                          // set next window position. call before Begin()
IMGUI_API void SetNextWindowPosCenter(ImGuiSetCond cond = 0);                                                                                                                       // set next window position to be centered on screen. call before Begin()
IMGUI_API void SetNextWindowSize(const ImVec2 &size, ImGuiSetCond 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, ImGuiSizeConstraintCallback custom_callback = NULL, void *custom_callback_data = NULL); // set next window size limits. use -1,-1 on either X/Y axis to preserve the current size. Use callback to apply non-trivial programmatic constraints.
IMGUI_API void SetNextWindowContentSize(const ImVec2 &size);                                                                                                                        // set next window content size (enforce the range of scrollbars). set axis to 0.0f to leave it automatic. call before Begin()
IMGUI_API void SetNextWindowContentWidth(float width);                                                                                                                              // set next window content width (enforce the range of horizontal scrollbar). call before Begin()
IMGUI_API void SetNextWindowCollapsed(bool collapsed, ImGuiSetCond cond = 0);                                                                                                       // set next window collapsed state. call before Begin()
IMGUI_API void SetNextWindowFocus();                                                                                                                                                // set next window to be focused / front-most. call before Begin()
IMGUI_API void SetWindowPos(const ImVec2 &pos, ImGuiSetCond 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, ImGuiSetCond 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, ImGuiSetCond cond = 0);                                                                                                           // (not recommended) set current window collapsed state. prefer using SetNextWindowCollapsed().
IMGUI_API void SetWindowFocus();                                                                                                                                                    // (not recommended) set current window to be focused / front-most. prefer using SetNextWindowFocus().
IMGUI_API void SetWindowPos(const char *name, const ImVec2 &pos, ImGuiSetCond cond = 0);                                                                                            // set named window position.
IMGUI_API void SetWindowSize(const char *name, const ImVec2 &size, ImGuiSetCond 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, ImGuiSetCond cond = 0);                                                                                         // set named window collapsed state
IMGUI_API void SetWindowFocus(const char *name);                                                                                                                                    // set named window to be focused / front-most. use NULL to remove focus.

IMGUI_API float GetScrollX();                                               // get scrolling amount [0..GetScrollMaxX()]
IMGUI_API float GetScrollY();                                               // get scrolling amount [0..GetScrollMaxY()]
IMGUI_API float GetScrollMaxX();                                            // get maximum scrolling amount ~~ ContentSize.X - WindowSize.X
IMGUI_API float GetScrollMaxY();                                            // get maximum scrolling amount ~~ ContentSize.Y - WindowSize.Y
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 void SetScrollHere(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.
IMGUI_API void SetScrollFromPosY(float pos_y, float center_y_ratio = 0.5f); // adjust scrolling amount to make given position valid. use GetCursorPos() or GetCursorStartPos()+offset to get valid positions.
IMGUI_API void SetKeyboardFocusHere(int offset = 0);                        // focus keyboard on the next widget. Use positive 'offset' to access sub components of a multiple component widget. Use negative 'offset' to access previous widgets.
IMGUI_API void SetStateStorage(ImGuiStorage *tree);                         // replace tree state storage with our own (if you want to manipulate it yourself, typically clear subsection of it)
IMGUI_API ImGuiStorage *GetStateStorage();

// Parameters stacks (shared)
IMGUI_API void PushStyleColor(ImGuiCol idx, const ImColor &col);
IMGUI_API void PopStyleColor(int count = 1);
IMGUI_API void PushStyleVar(ImGuiStyleVar idx, float val);
IMGUI_API void PushStyleVar(ImGuiStyleVar idx, const ImVec2 &val);
IMGUI_API void PopStyleVar(int count = 1);
IMGUI_API float GetFontSize();                     // get current font size (= height in pixels) of current font with current scale applied
IMGUI_API const ImColor &GetImColor(ImGuiCol idx); // retrieve given style color with style alpha applied and optional extra alpha multiplier
IMGUI_API ImU32 GetColorU32(const ImVec4 &col);                    // retrieve given color with style alpha applied

inline int GetColorValue(float r, float g, float b){
	if(r == g && g == b){
		// Grayscale ramp
		return 0xe8 + (0xff - 0xe8) * r;
	}
	// We have 0xD7 RGB colors.
	unsigned char ur = (unsigned char)(r * 6);
	unsigned char ug = (unsigned char)(g * 6);
	unsigned char ub = (unsigned char)(b * 6);
	return 0x10 + ur * 36 + ug * 6 + ub;
}

// Parameters stacks (current window)
IMGUI_API void PushItemWidth(float item_width); // width of items for the common item+label case, pixels. 0.0f = default to ~2/3 of windows width, >0.0f: width in pixels, <0.0f align xx pixels to the right of window (so -1.0f always align width to the right side)
IMGUI_API void  PopItemWidth();
IMGUI_API float CalcItemWidth();                         // width of item given pushed settings and current cursor position
IMGUI_API void PushTextWrapPos(float wrap_pos_x = 0.0f); // word-wrapping 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();
IMGUI_API void PushAllowKeyboardFocus(bool v); // allow focusing using TAB/Shift-TAB, enabled by default but you can disable it for certain widgets
IMGUI_API void PopAllowKeyboardFocus();
IMGUI_API void PushButtonRepeat(bool repeat); // in 'repeat' mode, Button*() functions return repeated true in a typematic manner (uses io.KeyRepeatDelay/io.KeyRepeatRate for now). Note that you can call IsItemActive() after any Button() to tell if the button is held in the current frame.
IMGUI_API void PopButtonRepeat();

// Cursor / Layout
IMGUI_API void Separator();                                           // horizontal line
IMGUI_API void SameLine(float pos_x = 0.0f, float spacing_w = -1.0f); // call between widgets or groups to layout them horizontally
IMGUI_API void NewLine();                                             // undo a SameLine()
IMGUI_API void Spacing();                                             // add vertical spacing
IMGUI_API void Dummy(const ImVec2 &size);                             // add a dummy item of given size
IMGUI_API void Indent(float indent_w = 0.0f);                         // move content position toward the right, by style.IndentSpacing or indent_w if >0
IMGUI_API void Unindent(float indent_w = 0.0f);                       // move content position back to the left, by style.IndentSpacing or indent_w if >0
IMGUI_API void BeginGroup();                                          // lock horizontal starting position + capture group bounding box into one "item" (so you can use IsItemHovered() or layout primitives such as SameLine() on whole group, etc.)
IMGUI_API void EndGroup();
IMGUI_API ImVec2 GetCursorPos();                      // cursor position is relative to window position
IMGUI_API float  GetCursorPosX();                     // "
IMGUI_API float  GetCursorPosY();                     // "
IMGUI_API void SetCursorPos(const ImVec2 &local_pos); // "
IMGUI_API void SetCursorPosX(float x);                // "
IMGUI_API void SetCursorPosY(float y);                // "
IMGUI_API ImVec2 GetCursorStartPos();                 // initial cursor position
IMGUI_API ImVec2 GetCursorScreenPos();                // cursor position in absolute screen coordinates [0..io.DisplaySize] (useful to work with ImDrawList API)
IMGUI_API void SetCursorScreenPos(const ImVec2 &pos); // cursor position in absolute screen coordinates [0..io.DisplaySize]
IMGUI_API void  AlignFirstTextHeightToWidgets();      // call once if the first item on the line is a Text() item and you want to vertically lower it to match subsequent (bigger) widgets
IMGUI_API float GetTextLineHeight();                  // height of font == GetWindowFontSize()
IMGUI_API float GetTextLineHeightWithSpacing();       // distance (in pixels) between 2 consecutive lines of text == GetWindowFontSize() + GetStyle().ItemSpacing.y
IMGUI_API float GetItemsLineHeightWithSpacing();      // distance (in pixels) between 2 consecutive lines of standard height widgets == GetWindowFontSize() + GetStyle().FramePadding.y*2 + GetStyle().ItemSpacing.y

// Columns
// You can also use SameLine(pos_x) for simplified columning. The columns API is still work-in-progress and rather lacking.
IMGUI_API void Columns(int count = 1, const char *id = NULL, bool border = true); // setup number of columns. use an identifier to distinguish multiple column sets. close with Columns(1).
IMGUI_API void  NextColumn();                                                     // next column
IMGUI_API int   GetColumnIndex();                                                 // get current column index
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 usually 0.0f and not resizable unless you call this
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 float GetColumnWidth(int column_index = -1);                            // column width (== GetColumnOffset(GetColumnIndex()+1) - GetColumnOffset(GetColumnOffset())
IMGUI_API int GetColumnsCount();                                                  // number of columns (what was passed to Columns())

// ID scopes
// If you are creating widgets in a loop you most likely want to push a unique identifier so ImGui can differentiate them.
// You can also use the "##foobar" syntax within widget label to distinguish them from each others. Read "A primer on the use of labels/IDs" in the FAQ for more details.
IMGUI_API void PushID(const char *str_id); // push identifier into the ID stack. IDs are hash of the *entire* stack!
IMGUI_API void PushID(const char *str_id_begin, const char *str_id_end);
IMGUI_API void PushID(const void *ptr_id);
IMGUI_API void PushID(int int_id);
IMGUI_API void PopID();
IMGUI_API ImGuiID GetID(const char *str_id); // calculate unique ID (hash of whole ID stack + given parameter). useful if you want to query into ImGuiStorage yourself. otherwise rarely needed
IMGUI_API ImGuiID GetID(const char *str_id_begin, const char *str_id_end);
IMGUI_API ImGuiID GetID(const void *ptr_id);

// Widgets
IMGUI_API void Text(const char *fmt, ...) IM_PRINTFARGS(1);
IMGUI_API void TextV(const char *fmt, va_list args);
IMGUI_API void TextColored(const ImColor &col, const char *fmt, ...) IM_PRINTFARGS(2); // shortcut for PushStyleColor(ImGuiCol_Text, col); Text(fmt, ...); PopStyleColor();
IMGUI_API void TextColoredV(const ImColor &col, const char *fmt, va_list args);
IMGUI_API void TextDisabled(const char *fmt, ...) IM_PRINTFARGS(1); // shortcut for PushStyleColor(ImGuiCol_Text, style.Colors[ImGuiCol_TextDisabled]); Text(fmt, ...); PopStyleColor();
IMGUI_API void TextDisabledV(const char *fmt, va_list args);
IMGUI_API void TextWrapped(const char *fmt, ...) IM_PRINTFARGS(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);
IMGUI_API void TextUnformatted(const char *text, const char *text_end = NULL);      // doesn't require null terminated string if 'text_end' is specified. no copy done to any bounded stack buffer, recommended for long chunks of text
IMGUI_API void LabelText(const char *label, const char *fmt, ...) IM_PRINTFARGS(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);
IMGUI_API void Bullet();                                          // draw a small circle and keep the cursor on the same line. advance cursor x position by GetTreeNodeToLabelSpacing(), same distance that TreeNode() uses
IMGUI_API void BulletText(const char *fmt, ...) IM_PRINTFARGS(1); // shortcut for Bullet()+Text()
IMGUI_API void BulletTextV(const char *fmt, va_list args);
IMGUI_API bool Button(const char *label, const ImVec2 &size = ImVec2(0, 0)); // button
IMGUI_API bool SmallButton(const char *label);                               // button with FramePadding=(0,0)
IMGUI_API bool InvisibleButton(const char *str_id, const ImVec2 &size);
IMGUI_API bool Checkbox(const char *label, bool *v);
IMGUI_API bool CheckboxFlags(const char *label, unsigned int *flags, unsigned int flags_value);
IMGUI_API bool RadioButton(const char *label, bool active);
IMGUI_API bool RadioButton(const char *label, int *v, int v_button);
IMGUI_API bool Combo(const char *label, int *current_item, const char **items, int items_count, int height_in_items = -1);
IMGUI_API bool Combo(const char *label, int *current_item, const char *items_separated_by_zeros, int height_in_items = -1); // separate items with \0, end item-list with \0\0
IMGUI_API bool Combo(const char *label, int *current_item, bool (*items_getter)(void *data, int idx, const char **out_text), void *data, int items_count, int height_in_items = -1);
IMGUI_API bool ColorButton(const ImVec4 &col, bool small_height = false, bool outline_border = true);
IMGUI_API bool ColorEdit3(const char *label, float col[3]);                         // Hint: 'float col[3]' function argument is same as 'float* col'. You can pass address of first element out of a contiguous set, e.g. &myvector.x
IMGUI_API bool ColorEdit4(const char *label, float col[4], bool show_alpha = true); // "
IMGUI_API void ColorEditMode(ImGuiColorEditMode mode);                              // FIXME-OBSOLETE: This is inconsistent with most of the API and will be obsoleted/replaced.
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));
IMGUI_API void ProgressBar(float fraction, const ImVec2 &size_arg = ImVec2(-1, 0), const char *overlay = NULL);

// Widgets: Drags (tip: ctrl+click on a drag box to input with keyboard. manually input values aren't clamped, can go off-bounds)
// For all the Float2/Float3/Float4/Int2/Int3/Int4 versions of every functions, remember than a 'float v[3]' function argument is the same as 'float* v'. You can pass address of your first element out of a contiguous set, e.g. &myvector.x
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 *display_format = "%.3f", float power = 1.0f); // 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 *display_format = "%.3f", float power = 1.0f);
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 *display_format = "%.3f", float power = 1.0f);
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 *display_format = "%.3f", float power = 1.0f);
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 *display_format = "%.3f", const char *display_format_max = NULL, float power = 1.0f);
IMGUI_API bool DragInt(const char *label, int *v, float v_speed = 1.0f, int v_min = 0, int v_max = 0, const char *display_format = "%.0f"); // 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 *display_format = "%.0f");
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 *display_format = "%.0f");
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 *display_format = "%.0f");
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 *display_format = "%.0f", const char *display_format_max = NULL);

// Widgets: Input with Keyboard
IMGUI_API bool InputText(const char *label, char *buf, size_t buf_size, ImGuiInputTextFlags flags = 0, ImGuiTextEditCallback 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, ImGuiTextEditCallback callback = NULL, void *user_data = NULL);
IMGUI_API bool InputFloat(const char *label, float *v, float step = 0.0f, float step_fast = 0.0f, int decimal_precision = -1, ImGuiInputTextFlags extra_flags = 0);
IMGUI_API bool InputFloat2(const char *label, float v[2], int decimal_precision = -1, ImGuiInputTextFlags extra_flags = 0);
IMGUI_API bool InputFloat3(const char *label, float v[3], int decimal_precision = -1, ImGuiInputTextFlags extra_flags = 0);
IMGUI_API bool InputFloat4(const char *label, float v[4], int decimal_precision = -1, ImGuiInputTextFlags extra_flags = 0);
IMGUI_API bool InputInt(const char *label, int *v, int step = 1, int step_fast = 100, ImGuiInputTextFlags extra_flags = 0);
IMGUI_API bool InputInt2(const char *label, int v[2], ImGuiInputTextFlags extra_flags = 0);
IMGUI_API bool InputInt3(const char *label, int v[3], ImGuiInputTextFlags extra_flags = 0);
IMGUI_API bool InputInt4(const char *label, int v[4], ImGuiInputTextFlags extra_flags = 0);

// Widgets: Sliders (tip: ctrl+click on a slider to input with keyboard. manually input values aren't clamped, can go off-bounds)
IMGUI_API bool SliderFloat(const char *label, float *v, float v_min, float v_max, const char *display_format = "%.3f", float power = 1.0f); // adjust display_format to decorate the value with a prefix or a suffix. Use power!=1.0 for logarithmic sliders
IMGUI_API bool SliderFloat2(const char *label, float v[2], float v_min, float v_max, const char *display_format = "%.3f", float power = 1.0f);
IMGUI_API bool SliderFloat3(const char *label, float v[3], float v_min, float v_max, const char *display_format = "%.3f", float power = 1.0f);
IMGUI_API bool SliderFloat4(const char *label, float v[4], float v_min, float v_max, const char *display_format = "%.3f", float power = 1.0f);
IMGUI_API bool SliderAngle(const char *label, float *v_rad, float v_degrees_min = -360.0f, float v_degrees_max = +360.0f);
IMGUI_API bool SliderInt(const char *label, int *v, int v_min, int v_max, const char *display_format = "%.0f");
IMGUI_API bool SliderInt2(const char *label, int v[2], int v_min, int v_max, const char *display_format = "%.0f");
IMGUI_API bool SliderInt3(const char *label, int v[3], int v_min, int v_max, const char *display_format = "%.0f");
IMGUI_API bool SliderInt4(const char *label, int v[4], int v_min, int v_max, const char *display_format = "%.0f");
IMGUI_API bool VSliderFloat(const char *label, const ImVec2 &size, float *v, float v_min, float v_max, const char *display_format = "%.3f", float power = 1.0f);
IMGUI_API bool VSliderInt(const char *label, const ImVec2 &size, int *v, int v_min, int v_max, const char *display_format = "%.0f");

// Widgets: Trees
IMGUI_API bool TreeNode(const char *label);                                         // if returning 'true' the node is open and the tree id is pushed into the id stack. user is responsible for calling TreePop().
IMGUI_API bool TreeNode(const char *str_id, const char *fmt, ...) IM_PRINTFARGS(2); // 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_PRINTFARGS(2); // "
IMGUI_API bool TreeNodeV(const char *str_id, const char *fmt, va_list args);        // "
IMGUI_API bool TreeNodeV(const void *ptr_id, const char *fmt, va_list args);        // "
IMGUI_API bool TreeNodeEx(const char *label, ImGuiTreeNodeFlags flags = 0);
IMGUI_API bool TreeNodeEx(const char *str_id, ImGuiTreeNodeFlags flags, const char *fmt, ...) IM_PRINTFARGS(3);
IMGUI_API bool TreeNodeEx(const void *ptr_id, ImGuiTreeNodeFlags flags, const char *fmt, ...) IM_PRINTFARGS(3);
IMGUI_API bool TreeNodeExV(const char *str_id, ImGuiTreeNodeFlags flags, const char *fmt, va_list args);
IMGUI_API bool TreeNodeExV(const void *ptr_id, ImGuiTreeNodeFlags flags, const char *fmt, va_list args);
IMGUI_API void TreePush(const char *str_id = NULL);                                             // ~ Indent()+PushId(). Already called by TreeNode() when returning true, but you can call Push/Pop yourself for layout purpose
IMGUI_API void TreePush(const void *ptr_id = NULL);                                             // "
IMGUI_API void  TreePop();                                                                      // ~ Unindent()+PopId()
IMGUI_API void  TreeAdvanceToLabelPos();                                                        // advance cursor x position by GetTreeNodeToLabelSpacing()
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 void SetNextTreeNodeOpen(bool is_open, ImGuiSetCond cond = 0);                        // set next TreeNode/CollapsingHeader open state.
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_open, ImGuiTreeNodeFlags flags = 0); // when 'p_open' isn't NULL, display an additional small close button on upper right of the header

// Widgets: Selectable / Lists
IMGUI_API bool Selectable(const char *label, bool selected = false, ImGuiSelectableFlags flags = 0, const ImVec2 &size = ImVec2(0, 0)); // 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));
IMGUI_API bool ListBox(const char *label, int *current_item, const char **items, int items_count, int height_in_items = -1);
IMGUI_API bool ListBox(const char *label, int *current_item, bool (*items_getter)(void *data, int idx, const char **out_text), void *data, int items_count, int height_in_items = -1);
IMGUI_API bool ListBoxHeader(const char *label, const ImVec2 &size = ImVec2(0, 0));         // use if you want to reimplement ListBox() will custom data or interactions. make sure to call ListBoxFooter() afterwards.
IMGUI_API bool ListBoxHeader(const char *label, int items_count, int height_in_items = -1); // "
IMGUI_API void ListBoxFooter();                                                             // terminate the scrolling region

// Widgets: Value() Helpers. 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);
IMGUI_API void ValueColor(const char *prefix, const ImVec4 &v);
IMGUI_API void ValueColor(const char *prefix, ImU32 v);

// Tooltips
IMGUI_API void SetTooltip(const char *fmt, ...) IM_PRINTFARGS(1); // set tooltip under mouse-cursor, typically use with ImGui::IsHovered(). last call wins
IMGUI_API void SetTooltipV(const char *fmt, va_list args);
IMGUI_API void BeginTooltip(); // use to create full-featured tooltip windows that aren't just text
IMGUI_API void EndTooltip();

// Menus
IMGUI_API bool BeginMainMenuBar(); // create and append to a full screen menu-bar. only call EndMainMenuBar() if this returns true!
IMGUI_API void EndMainMenuBar();
IMGUI_API bool BeginMenuBar(); // append to menu-bar of current window (requires ImGuiWindowFlags_MenuBar flag set). only call EndMenuBar() if this returns true!
IMGUI_API void EndMenuBar();
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();
IMGUI_API bool MenuItem(const char *label, const char *shortcut = NULL, bool selected = false, bool enabled = true); // return true when activated. shortcuts are displayed for convenience but not processed by ImGui at the moment
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

// Popups
IMGUI_API void OpenPopup(const char *str_id);                                                                         // mark popup as open. popups are closed when user click outside, or activate a pressable item, or CloseCurrentPopup() is called within a BeginPopup()/EndPopup() block. popup identifiers are relative to the current ID-stack (so OpenPopup and BeginPopup needs to be at the same level).
IMGUI_API bool BeginPopup(const char *str_id);                                                                        // return true if the popup is open, and you can start outputting to it. only call EndPopup() if BeginPopup() returned true!
IMGUI_API bool BeginPopupModal(const char *name, bool *p_open = NULL, ImGuiWindowFlags extra_flags = 0);              // modal dialog (can't close them by clicking outside)
IMGUI_API bool BeginPopupContextItem(const char *str_id, int mouse_button = 1);                                       // helper to open and begin popup when clicked on last item. read comments in .cpp!
IMGUI_API bool BeginPopupContextWindow(bool also_over_items = true, const char *str_id = NULL, int mouse_button = 1); // helper to open and begin popup when clicked on current window.
IMGUI_API bool BeginPopupContextVoid(const char *str_id = NULL, int mouse_button = 1);                                // helper to open and begin popup when clicked in void (no window).
IMGUI_API void EndPopup();
IMGUI_API void CloseCurrentPopup(); // close the popup we have begin-ed into. clicking on a MenuItem or Selectable automatically close the current popup.

// Logging: all text output from interface is redirected to tty/file/clipboard. By default, tree nodes are automatically opened during logging.
IMGUI_API void LogToTTY(int max_depth = -1);                               // start logging to tty
IMGUI_API void LogToFile(int max_depth = -1, const char *filename = NULL); // start logging to file
IMGUI_API void LogToClipboard(int max_depth = -1);                         // start logging to OS clipboard
IMGUI_API void LogFinish();                                                // stop logging (close file, etc.)
IMGUI_API void LogButtons();                                               // helper to display buttons for logging to tty/file/clipboard
IMGUI_API void LogText(const char *fmt, ...) IM_PRINTFARGS(1);             // pass text data straight to log (without being displayed)

// Clipping
IMGUI_API void PushClipRect(const ImVec2 &clip_rect_min, const ImVec2 &clip_rect_max, bool intersect_with_current_clip_rect);
IMGUI_API void PopClipRect();

// Utilities
IMGUI_API bool IsItemHovered();                     // was the last item hovered by mouse?
IMGUI_API bool IsItemHoveredRect();                 // was the last item hovered by mouse? even if another item is active or window is blocked by popup while we are hovering this
IMGUI_API bool IsItemActive();                      // was the last item active? (e.g. button being held, text field being edited- items that don't interact will always return false)
IMGUI_API bool IsItemClicked(int mouse_button = 0); // was the last item clicked? (e.g. button/node just clicked on)
IMGUI_API bool IsItemVisible();                     // was the last item visible? (aka not out of sight due to clipping/scrolling.)
IMGUI_API bool IsAnyItemHovered();
IMGUI_API bool IsAnyItemActive();
IMGUI_API ImVec2 GetItemRectMin();                                            // get bounding rect of last item in screen space
IMGUI_API ImVec2 GetItemRectMax();                                            // "
IMGUI_API ImVec2 GetItemRectSize();                                           // "
IMGUI_API void   SetItemAllowOverlap();                                       // allow last item to be overlapped by a subsequent item. sometimes useful with invisible buttons, selectables, etc. to catch unused area.
IMGUI_API bool   IsWindowHovered();                                           // is current window hovered and hoverable (not blocked by a popup) (differentiate child windows from each others)
IMGUI_API bool   IsWindowFocused();                                           // is current window focused
IMGUI_API bool   IsRootWindowFocused();                                       // is current root window focused (root = top-most parent of a child, otherwise self)
IMGUI_API bool   IsRootWindowOrAnyChildFocused();                             // is current root window or any of its child (including current window) focused
IMGUI_API bool   IsRootWindowOrAnyChildHovered();                             // is current root window or any of its child (including current window) hovered and hoverable (not blocked by a popup)
IMGUI_API bool IsRectVisible(const ImVec2 &size);                             // test if rectangle (of given size, starting from cursor position) is visible / not clipped.
IMGUI_API bool IsRectVisible(const ImVec2 &rect_min, const ImVec2 &rect_max); // test if rectangle (in screen space) is visible / not clipped. to perform coarse clipping on user's side.
IMGUI_API bool IsPosHoveringAnyWindow(const ImVec2 &pos);                     // is given position hovering any active imgui window
IMGUI_API float       GetTime();
IMGUI_API int         GetFrameCount();
IMGUI_API const char *GetStyleColName(ImGuiCol idx);
IMGUI_API ImVec2 CalcItemRectClosestPoint(const ImVec2 &pos, bool on_edge = false, float outward = +0.0f); // utility to find the closest point the last item bounding rectangle edge. useful to visually link items
IMGUI_API ImVec2 CalcTextSize(const char *text, const char *text_end = NULL, bool hide_text_after_double_hash = false, float wrap_width = -1.0f);
IMGUI_API void CalcListClipping(int items_count, float items_height, int *out_items_display_start, int *out_items_display_end); // calculate coarse clipping for large list of evenly sized items. Prefer using the ImGuiListClipper higher-level helper if you can.

IMGUI_API bool BeginChildFrame(ImGuiID id, const ImVec2 &size, ImGuiWindowFlags extra_flags = 0); // helper to create a child window / scrolling region that looks like a normal widget frame
IMGUI_API void EndChildFrame();

IMGUI_API ImVec4 ColorConvertU32ToFloat4(ImU32 in);
IMGUI_API ImU32 ColorConvertFloat4ToU32(const ImVec4 &in);
IMGUI_API void ColorConvertRGBtoHSV(float r, float g, float b, float &out_h, float &out_s, float &out_v);
IMGUI_API void ColorConvertHSVtoRGB(float h, float s, float v, float &out_r, float &out_g, float &out_b);

// Inputs
IMGUI_API int GetKeyIndex(ImGuiKey key);                                                        // map ImGuiKey_* values into user's key index. == io.KeyMap[key]
IMGUI_API bool IsKeyDown(int key_index);                                                        // key_index into the keys_down[] array, imgui doesn't know the semantic of each entry, uses your own indices!
IMGUI_API bool IsKeyPressed(int key_index, bool repeat = true);                                 // uses user's key indices as stored in the keys_down[] array. if repeat=true. uses io.KeyRepeatDelay / KeyRepeatRate
IMGUI_API bool IsKeyReleased(int key_index);                                                    // "
IMGUI_API bool IsMouseDown(int button);                                                         // is mouse button held
IMGUI_API bool IsMouseClicked(int button, bool repeat = false);                                 // did mouse button clicked (went from !Down to Down)
IMGUI_API bool IsMouseDoubleClicked(int button);                                                // did mouse button double-clicked. a double-click returns false in IsMouseClicked(). uses io.MouseDoubleClickTime.
IMGUI_API bool IsMouseReleased(int button);                                                     // did mouse button released (went from Down to !Down)
IMGUI_API bool IsMouseHoveringWindow();                                                         // is mouse hovering current window ("window" in API names always refer to current window). disregarding of any consideration of being blocked by a popup. (unlike IsWindowHovered() this will return true even if the window is blocked because of a popup)
IMGUI_API bool IsMouseHoveringAnyWindow();                                                      // is mouse hovering any visible window
IMGUI_API bool IsMouseHoveringRect(const ImVec2 &r_min, const ImVec2 &r_max, bool clip = true); // is mouse hovering given bounding rect (in screen space). clipped by current clipping settings. disregarding of consideration of focus/window ordering/blocked by a popup.
IMGUI_API bool IsMouseDragging(int button = 0, float lock_threshold = -1.0f);                   // is mouse dragging. if lock_threshold < -1.0f uses io.MouseDraggingThreshold
IMGUI_API ImVec2 GetMousePos();                                                                 // shortcut to ImGui::GetIO().MousePos provided by user, to be consistent with other calls
IMGUI_API ImVec2 GetMousePosOnOpeningCurrentPopup();                                            // retrieve backup of mouse positioning at the time of opening popup we have BeginPopup() into
IMGUI_API ImVec2 GetMouseDragDelta(int button = 0, float lock_threshold = -1.0f);               // dragging amount since clicking. if lock_threshold < -1.0f uses io.MouseDraggingThreshold
IMGUI_API void ResetMouseDragDelta(int button = 0);                                             //
IMGUI_API ImGuiMouseCursor GetMouseCursor();                                                    // get desired cursor type, reset in ImGui::NewFrame(), this updated during the frame. valid before Render(). If you use software rendering by setting io.MouseDrawCursor ImGui will render those for you
IMGUI_API void SetMouseCursor(ImGuiMouseCursor type);                                           // set desired cursor type
IMGUI_API void CaptureKeyboardFromApp(bool capture = true);                                     // manually override io.WantCaptureKeyboard flag next frame (said flag is entirely left for your application handle). e.g. force capture keyboard when your widget is being hovered.
IMGUI_API void CaptureMouseFromApp(bool capture = true);                                        // manually override io.WantCaptureMouse flag next frame (said flag is entirely left for your application handle).

// Helpers functions to access functions pointers in ImGui::GetIO()
IMGUI_API void *MemAlloc(size_t sz);
IMGUI_API void MemFree(void *ptr);
IMGUI_API const char *GetClipboardText();
IMGUI_API void SetClipboardText(const char *text);

// Internal context access - if you want to use multiple context, share context between modules (e.g. DLL). There is a default context created and active by default.
// All contexts share a same ImFontAtlas by default. If you want different font atlas, you can new() them and overwrite the GetIO().Fonts variable of an ImGui context.
IMGUI_API const char *GetVersion();
IMGUI_API ImGuiContext *CreateContext(void *(*malloc_fn)(size_t) = NULL, void (*free_fn)(void *) = NULL);
IMGUI_API void DestroyContext(ImGuiContext *ctx);
IMGUI_API ImGuiContext *GetCurrentContext();
IMGUI_API void SetCurrentContext(ImGuiContext *ctx);

// Obsolete (will be removed)
#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
static inline bool CollapsingHeader(const char *label, const char *str_id, bool framed = true, bool default_open = false) {
    (void)str_id;
    (void)framed;
    ImGuiTreeNodeFlags default_open_flags = 1 << 5;
    return CollapsingHeader(label, (default_open ? default_open_flags : 0));
} // OBSOLETE 1.49+
static inline float GetWindowFontSize() { return GetFontSize(); }                     // OBSOLETE 1.48+
static inline void  SetScrollPosHere() { SetScrollHere(); }                           // OBSOLETE 1.42+
static inline bool  GetWindowCollapsed() { return ImGui::IsWindowCollapsed(); }       // OBSOLETE 1.39+
static inline bool IsRectClipped(const ImVec2 &size) { return !IsRectVisible(size); } // OBSOLETE 1.39+
#endif

} // namespace ImGui

// Flags for ImGui::Begin()
enum ImGuiWindowFlags_ {
    // Default: 0
    ImGuiWindowFlags_NoTitleBar                = 1 << 0,  // Disable title-bar
    ImGuiWindowFlags_NoResize                  = 1 << 1,  // Disable user resizing with the lower-right grip
    ImGuiWindowFlags_NoMove                    = 1 << 2,  // Disable user moving the window
    ImGuiWindowFlags_NoScrollbar               = 1 << 3,  // Disable scrollbars (window can still scroll with mouse or programatically)
    ImGuiWindowFlags_NoScrollWithMouse         = 1 << 4,  // Disable user vertically scrolling with mouse wheel
    ImGuiWindowFlags_NoCollapse                = 1 << 5,  // Disable user collapsing window by double-clicking on it
    ImGuiWindowFlags_AlwaysAutoResize          = 1 << 6,  // Resize every window to its content every frame
    ImGuiWindowFlags_ShowBorders               = 1 << 7,  // Show borders around windows and items
    ImGuiWindowFlags_NoSavedSettings           = 1 << 8,  // Never load/save settings in .ini file
    ImGuiWindowFlags_NoInputs                  = 1 << 9,  // Disable catching mouse or keyboard inputs
    ImGuiWindowFlags_MenuBar                   = 1 << 10, // Has a menu-bar
    ImGuiWindowFlags_HorizontalScrollbar       = 1 << 11, // Allow horizontal scrollbar to appear (off by default). You may use SetNextWindowContentSize(ImVec2(width,0.0f)); prior to calling Begin() to specify width. Read code in imgui_demo in the "Horizontal Scrolling" section.
    ImGuiWindowFlags_NoFocusOnAppearing        = 1 << 12, // Disable taking focus when transitioning from hidden to visible state
    ImGuiWindowFlags_NoBringToFrontOnFocus     = 1 << 13, // Disable bringing window to front when taking focus (e.g. clicking on it or programatically giving it focus)
    ImGuiWindowFlags_AlwaysVerticalScrollbar   = 1 << 14, // Always show vertical scrollbar (even if ContentSize.y < Size.y)
    ImGuiWindowFlags_AlwaysHorizontalScrollbar = 1 << 15, // Always show horizontal scrollbar (even if ContentSize.x < Size.x)
    ImGuiWindowFlags_AlwaysUseWindowPadding    = 1 << 16, // Ensure child windows without border uses style.WindowPadding (ignored by default for non-bordered child windows, because more convenient)
    // [Internal]
    ImGuiWindowFlags_ChildWindow         = 1 << 20, // Don't use! For internal use by BeginChild()
    ImGuiWindowFlags_ChildWindowAutoFitX = 1 << 21, // Don't use! For internal use by BeginChild()
    ImGuiWindowFlags_ChildWindowAutoFitY = 1 << 22, // Don't use! For internal use by BeginChild()
    ImGuiWindowFlags_ComboBox            = 1 << 23, // Don't use! For internal use by ComboBox()
    ImGuiWindowFlags_Tooltip             = 1 << 24, // Don't use! For internal use by BeginTooltip()
    ImGuiWindowFlags_Popup               = 1 << 25, // Don't use! For internal use by BeginPopup()
    ImGuiWindowFlags_Modal               = 1 << 26, // Don't use! For internal use by BeginPopupModal()
    ImGuiWindowFlags_ChildMenu           = 1 << 27  // Don't use! For internal use by BeginMenu()
};

// Flags for ImGui::InputText()
enum ImGuiInputTextFlags_ {
    // Default: 0
    ImGuiInputTextFlags_CharsDecimal        = 1 << 0,  // Allow 0123456789.+-*/
    ImGuiInputTextFlags_CharsHexadecimal    = 1 << 1,  // Allow 0123456789ABCDEFabcdef
    ImGuiInputTextFlags_CharsUppercase      = 1 << 2,  // Turn a..z into A..Z
    ImGuiInputTextFlags_CharsNoBlank        = 1 << 3,  // Filter out spaces, tabs
    ImGuiInputTextFlags_AutoSelectAll       = 1 << 4,  // Select entire text when first taking mouse focus
    ImGuiInputTextFlags_EnterReturnsTrue    = 1 << 5,  // Return 'true' when Enter is pressed (as opposed to when the value was modified)
    ImGuiInputTextFlags_CallbackCompletion  = 1 << 6,  // Call user function on pressing TAB (for completion handling)
    ImGuiInputTextFlags_CallbackHistory     = 1 << 7,  // Call user function on pressing Up/Down arrows (for history handling)
    ImGuiInputTextFlags_CallbackAlways      = 1 << 8,  // Call user function every time. User code may query cursor position, modify text buffer.
    ImGuiInputTextFlags_CallbackCharFilter  = 1 << 9,  // Call user function to filter character. Modify data->EventChar to replace/filter input, or return 1 to discard character.
    ImGuiInputTextFlags_AllowTabInput       = 1 << 10, // Pressing TAB input a '\t' character into the text field
    ImGuiInputTextFlags_CtrlEnterForNewLine = 1 << 11, // In multi-line mode, allow exiting edition by pressing Enter. Ctrl+Enter to add new line (by default adds new lines with Enter).
    ImGuiInputTextFlags_NoHorizontalScroll  = 1 << 12, // Disable following the cursor horizontally
    ImGuiInputTextFlags_AlwaysInsertMode    = 1 << 13, // Insert mode
    ImGuiInputTextFlags_ReadOnly            = 1 << 14, // Read-only mode
    ImGuiInputTextFlags_Password            = 1 << 15, // Password mode, display all characters as '*'
    // [Internal]
    ImGuiInputTextFlags_Multiline = 1 << 20 // For internal use by InputTextMultiline()
};

// Flags for ImGui::TreeNodeEx(), ImGui::CollapsingHeader*()
enum ImGuiTreeNodeFlags_ {
    ImGuiTreeNodeFlags_Selected          = 1 << 0, // Draw as selected
    ImGuiTreeNodeFlags_Framed            = 1 << 1, // Full colored frame (e.g. for CollapsingHeader)
    ImGuiTreeNodeFlags_AllowOverlapMode  = 1 << 2, // Hit testing to allow subsequent widgets to overlap this one
    ImGuiTreeNodeFlags_NoTreePushOnOpen  = 1 << 3, // Don't do a TreePush() when open (e.g. for CollapsingHeader) = no extra indent nor pushing on ID stack
    ImGuiTreeNodeFlags_NoAutoOpenOnLog   = 1 << 4, // Don't automatically and temporarily open node when Logging is active (by default logging will automatically open tree nodes)
    ImGuiTreeNodeFlags_DefaultOpen       = 1 << 5, // Default node to be open
    ImGuiTreeNodeFlags_OpenOnDoubleClick = 1 << 6, // Need double-click to open node
    ImGuiTreeNodeFlags_OpenOnArrow       = 1 << 7, // Only open when clicking on the arrow part. If ImGuiTreeNodeFlags_OpenOnDoubleClick is also set, single-click arrow or double-click all box to open.
    ImGuiTreeNodeFlags_Leaf              = 1 << 8, // No collapsing, no arrow (use as a convenience for leaf nodes).
    ImGuiTreeNodeFlags_Bullet            = 1 << 9, // Display a bullet instead of arrow
    //ImGuITreeNodeFlags_SpanAllAvailWidth  = 1 << 10,  // FIXME: TODO: Extend hit box horizontally even if not framed
    //ImGuiTreeNodeFlags_NoScrollOnOpen     = 1 << 11,  // FIXME: TODO: Disable automatic scroll on TreePop() if node got just open and contents is not visible
    ImGuiTreeNodeFlags_CollapsingHeader = ImGuiTreeNodeFlags_Framed | ImGuiTreeNodeFlags_NoAutoOpenOnLog
};

// Flags for ImGui::Selectable()
enum ImGuiSelectableFlags_ {
    // Default: 0
    ImGuiSelectableFlags_DontClosePopups  = 1 << 0, // Clicking this don't close parent popup window
    ImGuiSelectableFlags_SpanAllColumns   = 1 << 1, // Selectable frame can span all columns (text will still fit in current column)
    ImGuiSelectableFlags_AllowDoubleClick = 1 << 2  // Generate press events on double clicks too
};

// User fill ImGuiIO.KeyMap[] array with indices into the ImGuiIO.KeysDown[512] array
enum ImGuiKey_ {
    ImGuiKey_Tab,        // for tabbing through fields
    ImGuiKey_LeftArrow,  // for text edit
    ImGuiKey_RightArrow, // for text edit
    ImGuiKey_UpArrow,    // for text edit
    ImGuiKey_DownArrow,  // for text edit
    ImGuiKey_PageUp,
    ImGuiKey_PageDown,
    ImGuiKey_Home,      // for text edit
    ImGuiKey_End,       // for text edit
    ImGuiKey_Delete,    // for text edit
    ImGuiKey_Backspace, // for text edit
    ImGuiKey_Enter,     // for text edit
    ImGuiKey_Escape,    // for text edit
    ImGuiKey_A,         // for text edit CTRL+A: select all
    ImGuiKey_C,         // for text edit CTRL+C: copy
    ImGuiKey_V,         // for text edit CTRL+V: paste
    ImGuiKey_X,         // for text edit CTRL+X: cut
    ImGuiKey_Y,         // for text edit CTRL+Y: redo
    ImGuiKey_Z,         // for text edit CTRL+Z: undo
    ImGuiKey_COUNT
};

// Enumeration for PushStyleColor() / PopStyleColor()
enum ImGuiCol_ {
    ImGuiCol_Text,
    ImGuiCol_TextDisabled,
    ImGuiCol_WindowBg,      // Background of normal windows
    ImGuiCol_ChildWindowBg, // Background of child windows
    ImGuiCol_PopupBg,       // Background of popups, menus, tooltips windows
    ImGuiCol_Border,
    ImGuiCol_BorderShadow,
    ImGuiCol_FrameBg, // Background of checkbox, radio button, plot, slider, text input
    ImGuiCol_FrameBgHovered,
    ImGuiCol_FrameBgActive,
    ImGuiCol_TitleBg,
    ImGuiCol_TitleBgCollapsed,
    ImGuiCol_TitleBgActive,
    ImGuiCol_MenuBarBg,
    ImGuiCol_ScrollbarBg,
    ImGuiCol_ScrollbarGrab,
    ImGuiCol_ScrollbarGrabHovered,
    ImGuiCol_ScrollbarGrabActive,
    ImGuiCol_ComboBg,
    ImGuiCol_CheckMark,
    ImGuiCol_SliderGrab,
    ImGuiCol_SliderGrabActive,
    ImGuiCol_Button,
    ImGuiCol_ButtonHovered,
    ImGuiCol_ButtonActive,
    ImGuiCol_Header,
    ImGuiCol_HeaderHovered,
    ImGuiCol_HeaderActive,
    ImGuiCol_Column,
    ImGuiCol_ColumnHovered,
    ImGuiCol_ColumnActive,
    ImGuiCol_ResizeGrip,
    ImGuiCol_ResizeGripHovered,
    ImGuiCol_ResizeGripActive,
    ImGuiCol_CloseButton,
    ImGuiCol_CloseButtonHovered,
    ImGuiCol_CloseButtonActive,
    ImGuiCol_PlotLines,
    ImGuiCol_PlotLinesHovered,
    ImGuiCol_PlotHistogram,
    ImGuiCol_PlotHistogramHovered,
    ImGuiCol_TextSelectedBg,
    ImGuiCol_ModalWindowDarkening, // darken entire screen when a modal window is active
    ImGuiCol_COUNT
};

// Enumeration for PushStyleVar() / PopStyleVar()
// NB: the enum only refers to fields of ImGuiStyle() which makes sense to be pushed/poped in UI code. Feel free to add others.
enum ImGuiStyleVar_ {
    ImGuiStyleVar_Alpha,               // float
    ImGuiStyleVar_WindowPadding,       // ImVec2
    ImGuiStyleVar_WindowRounding,      // float
    ImGuiStyleVar_WindowMinSize,       // ImVec2
    ImGuiStyleVar_ChildWindowRounding, // float
    ImGuiStyleVar_FramePadding,        // ImVec2
    ImGuiStyleVar_FrameRounding,       // float
    ImGuiStyleVar_ItemSpacing,         // ImVec2
    ImGuiStyleVar_ItemInnerSpacing,    // ImVec2
    ImGuiStyleVar_IndentSpacing,       // float
    ImGuiStyleVar_GrabMinSize,         // float
    ImGuiStyleVar_ButtonTextAlign,     // flags ImGuiAlign_*
    ImGuiStyleVar_Count_
};

// Enumeration for ColorEditMode()
// FIXME-OBSOLETE: Will be replaced by future color/picker api
enum ImGuiColorEditMode_ {
    ImGuiColorEditMode_UserSelect           = -2,
    ImGuiColorEditMode_UserSelectShowButton = -1,
    ImGuiColorEditMode_RGB                  = 0,
    ImGuiColorEditMode_HSV                  = 1,
    ImGuiColorEditMode_HEX                  = 2
};

// Enumeration for GetMouseCursor()
enum ImGuiMouseCursor_ {
    ImGuiMouseCursor_Arrow = 0,
    ImGuiMouseCursor_TextInput,  // When hovering over InputText, etc.
    ImGuiMouseCursor_Move,       // Unused
    ImGuiMouseCursor_ResizeNS,   // Unused
    ImGuiMouseCursor_ResizeEW,   // When hovering over a column
    ImGuiMouseCursor_ResizeNESW, // Unused
    ImGuiMouseCursor_ResizeNWSE, // When hovering over the bottom-right corner of a window
    ImGuiMouseCursor_Count_
};

// Condition flags for ImGui::SetWindow***(), SetNextWindow***(), SetNextTreeNode***() functions
// All those functions treat 0 as a shortcut to ImGuiSetCond_Always
enum ImGuiSetCond_ {
    ImGuiSetCond_Always       = 1 << 0, // Set the variable
    ImGuiSetCond_Once         = 1 << 1, // Set the variable once per runtime session (only the first call with succeed)
    ImGuiSetCond_FirstUseEver = 1 << 2, // Set the variable if the window has no saved data (if doesn't exist in the .ini file)
    ImGuiSetCond_Appearing    = 1 << 3  // Set the variable if the window is appearing after being hidden/inactive (or the first time)
};

// ImColor() helper to implicity converts colors to either ImU32 (packed 4x1 byte) or ImVec4 (4x1 float)
// Prefer using IM_COL32() macros if you want a guaranteed compile-time ImU32 for usage with ImDrawList API.
// Avoid storing ImColor! Store either u32 of ImVec4. This is not a full-featured color class.
// None of the ImGui API are using ImColor directly but you can use it as a convenience to pass colors in either ImU32 or ImVec4 formats.
struct ImColor {
    unsigned char fg, bg;

    ImColor() { fg = 0, bg = 0; }
    ImColor(int r, int g) {
        fg = r;
        bg = g;
    }
};

struct ImGuiStyle {
    float   Alpha;                  // Global alpha applies to everything in ImGui
    ImVec2  WindowPadding;          // Padding within a window
    ImVec2  WindowMinSize;          // Minimum window size
    float   WindowRounding;         // Radius of window corners rounding. Set to 0.0f to have rectangular windows
    ImVec2  WindowTitleAlign;       // Alignment for title bar text. Defaults to (0.0f,0.5f) for left-aligned,vertically centered.
    float   ChildWindowRounding;    // Radius of child window corners rounding. Set to 0.0f to have rectangular windows
    ImVec2  FramePadding;           // Padding within a framed rectangle (used by most widgets)
    float   FrameRounding;          // Radius of frame corners rounding. Set to 0.0f to have rectangular frame (used by most widgets).
    ImVec2  ItemSpacing;            // Horizontal and vertical spacing between widgets/lines
    ImVec2  ItemInnerSpacing;       // Horizontal and vertical spacing between within elements of a composed widget (e.g. a slider and its label)
    ImVec2  TouchExtraPadding;      // Expand reactive bounding box for touch-based system where touch position is not accurate enough. Unfortunately we don't sort widgets so priority on overlap will always be given to the first widget. So don't grow this too much!
    float   IndentSpacing;          // Horizontal indentation when e.g. entering a tree node. Generally == (FontSize + FramePadding.x*2).
    float   ColumnsMinSpacing;      // Minimum horizontal spacing between two columns
    float   ScrollbarSize;          // Width of the vertical scrollbar, Height of the horizontal scrollbar
    float   ScrollbarRounding;      // Radius of grab corners for scrollbar
    float   GrabMinSize;            // Minimum width/height of a grab box for slider/scrollbar.
    float   GrabRounding;           // Radius of grabs corners rounding. Set to 0.0f to have rectangular slider grabs.
    ImVec2  ButtonTextAlign;        // Alignment of button text when button is larger than text. Defaults to (0.5f,0.5f) for horizontally+vertically centered.
    ImVec2  DisplayWindowPadding;   // Window positions are clamped to be visible within the display area by at least this amount. Only covers regular windows.
    ImVec2  DisplaySafeAreaPadding; // If you cannot see the edge of your screen (e.g. on a TV) increase the safe area padding. Covers popups/tooltips as well regular windows.
    bool    AntiAliasedLines;       // Enable anti-aliasing on lines/borders. Disable if you are really tight on CPU/GPU.
    bool    AntiAliasedShapes;      // Enable anti-aliasing on filled shapes (rounded rectangles, circles, etc.)
    ImColor Colors[ImGuiCol_COUNT];

    IMGUI_API ImGuiStyle();
};

// This is where your app communicate with ImGui. Access via ImGui::GetIO().
// Read 'Programmer guide' section in .cpp file for general usage.
struct ImGuiIO {
    //------------------------------------------------------------------
    // Settings (fill once)                 // Default value:
    //------------------------------------------------------------------

    ImVec2      DisplaySize;             // <unset>              // Display size, in pixels. For clamping windows positions.
    float       DeltaTime;               // = 1.0f/60.0f         // Time elapsed since last frame, in seconds.
    float       IniSavingRate;           // = 5.0f               // Maximum time between saving positions/sizes to .ini file, in seconds.
    const char *IniFilename;             // = "imgui.ini"        // Path to .ini file. NULL to disable .ini saving.
    const char *LogFilename;             // = "imgui_log.txt"    // Path to .log file (default parameter to ImGui::LogToFile when no file is specified).
    float       MouseDoubleClickTime;    // = 0.30f              // Time for a double-click, in seconds.
    float       MouseDoubleClickMaxDist; // = 6.0f               // Distance threshold to stay in to validate a double-click, in pixels.
    float       MouseDragThreshold;      // = 6.0f               // Distance threshold before considering we are dragging
    int         KeyMap[ImGuiKey_COUNT];  // <unset>              // Map of indices into the KeysDown[512] entries array
    float       KeyRepeatDelay;          // = 0.250f             // When holding a key/button, time before it starts repeating, in seconds (for buttons in Repeat mode, etc.).
    float       KeyRepeatRate;           // = 0.020f             // When holding a key/button, rate at which it repeats, in seconds.
    void *      UserData;                // = NULL               // Store your own data for retrieval by callbacks.

    float  FontGlobalScale;         // = 1.0f               // Global scale all fonts
    bool   FontAllowUserScaling;    // = false              // Allow user scaling text of individual window with CTRL+Wheel.
    ImVec2 DisplayFramebufferScale; // = (1.0f,1.0f)        // For retina display or other situations where window coordinates are different from framebuffer coordinates. User storage only, presently not used by ImGui.
    ImVec2 DisplayVisibleMin;       // <unset> (0.0f,0.0f)  // If you use DisplaySize as a virtual space larger than your screen, set DisplayVisibleMin/Max to the visible area.
    ImVec2 DisplayVisibleMax;       // <unset> (0.0f,0.0f)  // If the values are the same, we defaults to Min=(0.0f) and Max=DisplaySize

    // Advanced/subtle behaviors
    bool OSXBehaviors; // = defined(__APPLE__) // OS X style: Text editing cursor movement using Alt instead of Ctrl, Shortcuts using Cmd/Super instead of Ctrl, Line/Text Start and End using Cmd+Arrows instead of Home/End, Double click selects by word instead of selecting whole text, Multi-selection in lists uses Cmd/Super instead of Ctrl

    //------------------------------------------------------------------
    // User Functions
    //------------------------------------------------------------------

	// Rendering function, will be called in Render().
    // Alternatively you can keep this to NULL and call GetDrawData() after Render() to get the same pointer.
    // See example applications if you are unsure of how to implement this.
    void (*RenderDrawListsFn)(ImDrawData *data);

    // Optional: access OS clipboard
    // (default to use native Win32 clipboard on Windows, otherwise uses a private clipboard. Override to access OS clipboard on other architectures)
    const char *(*GetClipboardTextFn)();
    void (*SetClipboardTextFn)(const char *text);

    // Optional: override memory allocations. MemFreeFn() may be called with a NULL pointer.
    // (default to posix malloc/free)
    void *(*MemAllocFn)(size_t sz);
    void (*MemFreeFn)(void *ptr);

    // Optional: notify OS Input Method Editor of the screen position of your cursor for text input position (e.g. when using Japanese/Chinese IME in Windows)
    // (default to use native imm32 api on Windows)
    void (*ImeSetInputScreenPosFn)(int x, int y);
    void *ImeWindowHandle; // (Windows) Set this to your HWND to get automatic IME cursor positioning.

    //------------------------------------------------------------------
    // Input - Fill before calling NewFrame()
    //------------------------------------------------------------------

    ImVec2  MousePos;                // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
    bool    MouseDown[5];            // Mouse buttons: left, right, middle + extras. ImGui itself mostly only uses left button (BeginPopupContext** are using right button). Others buttons allows us to track if the mouse is being used by your application + available to user as a convenience via IsMouse** API.
    float   MouseWheel;              // Mouse wheel: 1 unit scrolls about 5 lines text.
    bool    MouseDrawCursor;         // Request ImGui to draw a mouse cursor for you (if you are on a platform without a mouse cursor).
    bool    KeyCtrl;                 // Keyboard modifier pressed: Control
    bool    KeyShift;                // Keyboard modifier pressed: Shift
    bool    KeyAlt;                  // Keyboard modifier pressed: Alt
    bool    KeySuper;                // Keyboard modifier pressed: Cmd/Super/Windows
    bool    KeysDown[512];           // Keyboard keys that are pressed (in whatever storage order you naturally have access to keyboard data)
    ImWchar InputCharacters[16 + 1]; // List of characters input (translated by user from keypress+keyboard state). Fill using AddInputCharacter() helper.

    // Functions
    IMGUI_API void AddInputCharacter(ImWchar c);                   // Helper to add a new character into InputCharacters[]
    IMGUI_API void AddInputCharactersUTF8(const char *utf8_chars); // Helper to add new characters into InputCharacters[] from an UTF-8 string
    inline void ClearInputCharacters() { InputCharacters[0] = 0; } // Helper to clear the text input buffer

    //------------------------------------------------------------------
    // Output - Retrieve after calling NewFrame(), you can use them to discard inputs or hide them from the rest of your application
    //------------------------------------------------------------------

    bool  WantCaptureMouse;      // Mouse is hovering a window or widget is active (= ImGui will use your mouse input)
    bool  WantCaptureKeyboard;   // Widget is active (= ImGui will use your keyboard input)
    bool  WantTextInput;         // Some text input widget is active, which will read input characters from the InputCharacters array.
    float Framerate;             // Framerate estimation, in frame per second. Rolling average estimation based on IO.DeltaTime over 120 frames
    int   MetricsAllocs;         // Number of active memory allocations
    int   MetricsRenderVertices; // Vertices output during last call to Render()
    int   MetricsRenderIndices;  // Indices output during last call to Render() = number of triangles * 3
    int   MetricsActiveWindows;  // Number of visible windows (exclude child windows)

    //------------------------------------------------------------------
    // [Internal] ImGui will maintain those fields for you
    //------------------------------------------------------------------

    ImVec2 MousePosPrev;               // Previous mouse position
    ImVec2 MouseDelta;                 // Mouse delta. Note that this is zero if either current or previous position are negative to allow mouse enabling/disabling.
    bool   MouseClicked[5];            // Mouse button went from !Down to Down
    ImVec2 MouseClickedPos[5];         // Position at time of clicking
    float  MouseClickedTime[5];        // Time of last click (used to figure out double-click)
    bool   MouseDoubleClicked[5];      // Has mouse button been double-clicked?
    bool   MouseReleased[5];           // Mouse button went from Down to !Down
    bool   MouseDownOwned[5];          // Track if button was clicked inside a window. We don't request mouse capture from the application if click started outside ImGui bounds.
    float  MouseDownDuration[5];       // Duration the mouse button has been down (0.0f == just clicked)
    float  MouseDownDurationPrev[5];   // Previous time the mouse button has been down
    float  MouseDragMaxDistanceSqr[5]; // Squared maximum distance of how much mouse has traveled from the click point
    float  KeysDownDuration[512];      // Duration the keyboard key has been down (0.0f == just pressed)
    float  KeysDownDurationPrev[512];  // Previous duration the key has been down

    IMGUI_API ImGuiIO();
};

//-----------------------------------------------------------------------------
// Helpers
//-----------------------------------------------------------------------------

// Lightweight std::vector<> like class to avoid dragging dependencies (also: windows implementation of STL with debug enabled is absurdly slow, so let's bypass it so our code runs fast in debug).
// Our implementation does NOT call c++ constructors because we don't use them in ImGui. Don't use this class as a straight std::vector replacement in your code!
template <typename T>
class ImVector {
  public:
    int Size;
    int Capacity;
    T * Data;

    typedef T                 value_type;
    typedef value_type *      iterator;
    typedef const value_type *const_iterator;

    ImVector() {
        Size = Capacity = 0;
        Data            = NULL;
    }
    ~ImVector() {
        if(Data)
            ImGui::MemFree(Data);
    }

    inline bool empty() const { return Size == 0; }
    inline int  size() const { return Size; }
    inline int  capacity() const { return Capacity; }

    inline value_type &operator[](int i) {
        IM_ASSERT(i < Size);
        return Data[i];
    }
    inline const value_type &operator[](int i) const {
        IM_ASSERT(i < Size);
        return Data[i];
    }

    inline void clear() {
        if(Data) {
            Size = Capacity = 0;
            ImGui::MemFree(Data);
            Data = NULL;
        }
    }
    inline iterator       begin() { return Data; }
    inline const_iterator begin() const { return Data; }
    inline iterator       end() { return Data + Size; }
    inline const_iterator end() const { return Data + Size; }
    inline value_type &   front() {
        IM_ASSERT(Size > 0);
        return Data[0];
    }
    inline const value_type &front() const {
        IM_ASSERT(Size > 0);
        return Data[0];
    }
    inline value_type &back() {
        IM_ASSERT(Size > 0);
        return Data[Size - 1];
    }
    inline const value_type &back() const {
        IM_ASSERT(Size > 0);
        return Data[Size - 1];
    }
    inline void swap(ImVector<T> &rhs) {
        int rhs_size         = rhs.Size;
        rhs.Size             = Size;
        Size                 = rhs_size;
        int rhs_cap          = rhs.Capacity;
        rhs.Capacity         = Capacity;
        Capacity             = rhs_cap;
        value_type *rhs_data = rhs.Data;
        rhs.Data             = Data;
        Data                 = rhs_data;
    }

    inline int _grow_capacity(int new_size) {
        int new_capacity = Capacity ? (Capacity + Capacity / 2) : 8;
        return new_capacity > new_size ? new_capacity : new_size;
    }

    inline void resize(int new_size) {
        if(new_size > Capacity)
            reserve(_grow_capacity(new_size));
        Size = new_size;
    }
    inline void reserve(int new_capacity) {
        if(new_capacity <= Capacity)
            return;
        T *new_data = (value_type *)ImGui::MemAlloc((size_t)new_capacity * sizeof(value_type));
        if(Data)
            memcpy(new_data, Data, (size_t)Size * sizeof(value_type));
        ImGui::MemFree(Data);
        Data     = new_data;
        Capacity = new_capacity;
    }

    inline void push_back(const value_type &v) {
        if(Size == Capacity)
            reserve(_grow_capacity(Size + 1));
        Data[Size++] = v;
    }
    inline void pop_back() {
        IM_ASSERT(Size > 0);
        Size--;
    }

    inline iterator erase(const_iterator it) {
        IM_ASSERT(it >= Data && it < Data + Size);
        const ptrdiff_t off = it - Data;
        memmove(Data + off, Data + off + 1, ((size_t)Size - (size_t)off - 1) * sizeof(value_type));
        Size--;
        return Data + off;
    }
    inline iterator insert(const_iterator it, const value_type &v) {
        IM_ASSERT(it >= Data && it <= Data + Size);
        const ptrdiff_t off = it - Data;
        if(Size == Capacity)
            reserve(Capacity ? Capacity * 2 : 4);
        if(off < (int)Size)
            memmove(Data + off + 1, Data + off, ((size_t)Size - (size_t)off) * sizeof(value_type));
        Data[off] = v;
        Size++;
        return Data + off;
    }
};

// Helper: execute a block of code at maximum once a frame
// Convenient if you want to quickly create an UI within deep-nested code that runs multiple times every frame.
// Usage:
//   IMGUI_ONCE_UPON_A_FRAME
//   {
//      // code block will be executed one per frame
//   }
// Attention! the macro expands into 2 statement so make sure you don't use it within e.g. an if() statement without curly braces.
#define IMGUI_ONCE_UPON_A_FRAME                     \
    static ImGuiOnceUponAFrame imgui_oaf##__LINE__; \
    if(imgui_oaf##__LINE__)
struct ImGuiOnceUponAFrame {
    ImGuiOnceUponAFrame() { RefFrame = -1; }
    mutable int RefFrame;
    operator bool() const {
        int current_frame = ImGui::GetFrameCount();
        if(RefFrame == current_frame)
            return false;
        RefFrame = current_frame;
        return true;
    }
};

// Helper: Parse and apply text filters. In format "aaaaa[,bbbb][,ccccc]"
struct ImGuiTextFilter {
    struct TextRange {
        const char *b;
        const char *e;

        TextRange() { b = e = NULL; }
        TextRange(const char *_b, const char *_e) {
            b = _b;
            e = _e;
        }
        const char *begin() const { return b; }
        const char *end() const { return e; }
        bool        empty() const { return b == e; }
        char        front() const { return *b; }
        static bool is_blank(char c) { return c == ' ' || c == '\t'; }
        void                      trim_blanks() {
            while(b < e && is_blank(*b))
                b++;
            while(e > b && is_blank(*(e - 1)))
                e--;
        }
        IMGUI_API void split(char separator, ImVector<TextRange> &out);
    };

    char                InputBuf[256];
    ImVector<TextRange> Filters;
    int                 CountGrep;

    ImGuiTextFilter(const char *default_filter = "");
    ~ImGuiTextFilter() {}
    void Clear() {
        InputBuf[0] = 0;
        Build();
    }
    bool Draw(const char *label = "Filter (inc,-exc)", float width = 0.0f); // Helper calling InputText+Build
    bool PassFilter(const char *text, const char *text_end = NULL) const;
    bool           IsActive() const { return !Filters.empty(); }
    IMGUI_API void Build();
};

// Helper: Text buffer for logging/accumulating text
struct ImGuiTextBuffer {
    ImVector<char> Buf;

    ImGuiTextBuffer() { Buf.push_back(0); }
    inline char operator[](int i) { return Buf.Data[i]; }
    const char *               begin() const { return &Buf.front(); }
    const char *               end() const { return &Buf.back(); } // Buf is zero-terminated, so end() will point on the zero-terminator
    int                        size() const { return Buf.Size - 1; }
    bool                       empty() { return Buf.Size <= 1; }
    void                       clear() {
        Buf.clear();
        Buf.push_back(0);
    }
    const char *   c_str() const { return Buf.Data; }
    IMGUI_API void append(const char *fmt, ...) IM_PRINTFARGS(2);
    IMGUI_API void appendv(const char *fmt, va_list args);
};

// Helper: Simple Key->value storage
// - Store collapse state for a tree (Int 0/1)
// - Store color edit options (Int using values in ImGuiColorEditMode enum).
// - Custom user storage for temporary values.
// Typically you don't have to worry about this since a storage is held within each Window.
// Declare your own storage if:
// - You want to manipulate the open/close state of a particular sub-tree in your interface (tree node uses Int 0/1 to store their state).
// - You want to store custom debug data easily without adding or editing structures in your code.
// Types are NOT stored, so it is up to you to make sure your Key don't collide with different types.
struct ImGuiStorage {
    struct Pair {
        ImGuiID key;
        union {
            int   val_i;
            float val_f;
            void *val_p;
        };
        Pair(ImGuiID _key, int _val_i) {
            key   = _key;
            val_i = _val_i;
        }
        Pair(ImGuiID _key, float _val_f) {
            key   = _key;
            val_f = _val_f;
        }
        Pair(ImGuiID _key, void *_val_p) {
            key   = _key;
            val_p = _val_p;
        }
    };
    ImVector<Pair> Data;

    // - Get***() functions find pair, never add/allocate. Pairs are sorted so a query is O(log N)
    // - Set***() functions find pair, insertion on demand if missing.
    // - Sorted insertion is costly, paid once. A typical frame shouldn't need to insert any new pair.
    IMGUI_API void Clear();
    IMGUI_API int GetInt(ImGuiID key, int default_val = 0) const;
    IMGUI_API void SetInt(ImGuiID key, int val);
    IMGUI_API bool GetBool(ImGuiID key, bool default_val = false) const;
    IMGUI_API void SetBool(ImGuiID key, bool val);
    IMGUI_API float GetFloat(ImGuiID key, float default_val = 0.0f) const;
    IMGUI_API void SetFloat(ImGuiID key, float val);
    IMGUI_API void *GetVoidPtr(ImGuiID key) const; // default_val is NULL
    IMGUI_API void SetVoidPtr(ImGuiID key, void *val);

    // - Get***Ref() functions finds pair, insert on demand if missing, return pointer. Useful if you intend to do Get+Set.
    // - References are only valid until a new value is added to the storage. Calling a Set***() function or a Get***Ref() function invalidates the pointer.
    // - A typical use case where this is convenient:
    //      float* pvar = ImGui::GetFloatRef(key); ImGui::SliderFloat("var", pvar, 0, 100.0f); some_var += *pvar;
    // - You can also use this to quickly create temporary editable values during a session of using Edit&Continue, without restarting your application.
    IMGUI_API int *GetIntRef(ImGuiID key, int default_val = 0);
    IMGUI_API bool *GetBoolRef(ImGuiID key, bool default_val = false);
    IMGUI_API float *GetFloatRef(ImGuiID key, float default_val = 0.0f);
    IMGUI_API void **GetVoidPtrRef(ImGuiID key, void *default_val = NULL);

    // Use on your own storage if you know only integer are being stored (open/close all tree nodes)
    IMGUI_API void SetAllInt(int val);
};

// Shared state of InputText(), passed to callback when a ImGuiInputTextFlags_Callback* flag is used and the corresponding callback is triggered.
struct ImGuiTextEditCallbackData {
    ImGuiInputTextFlags EventFlag; // One of ImGuiInputTextFlags_Callback* // Read-only
    ImGuiInputTextFlags Flags;     // What user passed to InputText()      // Read-only
    void *              UserData;  // What user passed to InputText()      // Read-only
    bool                ReadOnly;  // Read-only mode                       // Read-only

    // CharFilter event:
    ImWchar EventChar; // Character input                      // Read-write (replace character or set to zero)

    // Completion,History,Always events:
    // If you modify the buffer contents make sure you update 'BufTextLen' and set 'BufDirty' to true.
    ImGuiKey EventKey;       // Key pressed (Up/Down/TAB)            // Read-only
    char *   Buf;            // Current text buffer                  // Read-write (pointed data only, can't replace the actual pointer)
    int      BufTextLen;     // Current text length in bytes         // Read-write
    int      BufSize;        // Maximum text length in bytes         // Read-only
    bool     BufDirty;       // Set if you modify Buf/BufTextLen!!   // Write
    int      CursorPos;      //                                      // Read-write
    int      SelectionStart; //                                      // Read-write (== to SelectionEnd when no selection)
    int      SelectionEnd;   //                                      // Read-write

    // NB: Helper functions for text manipulation. Calling those function loses selection.
    void DeleteChars(int pos, int bytes_count);
    void InsertChars(int pos, const char *text, const char *text_end = NULL);
    bool HasSelection() const { return SelectionStart != SelectionEnd; }
};

// Resizing callback data to apply custom constraint. As enabled by SetNextWindowSizeConstraints(). Callback is called during the next Begin().
// NB: For basic min/max size constraint on each axis you don't need to use the callback! The SetNextWindowSizeConstraints() parameters are enough.
struct ImGuiSizeConstraintCallbackData {
    void * UserData;    // Read-only.   What user passed to SetNextWindowSizeConstraints()
    ImVec2 Pos;         // Read-only.	Window position, for reference.
    ImVec2 CurrentSize; // Read-only.	Current window size.
    ImVec2 DesiredSize; // Read-write.  Desired size, based on user's mouse position. Write to this field to restrain resizing.
};

// Helper: Manually clip large list of items.
// If you are submitting lots of evenly spaced items and you have a random access to the list, you can perform coarse clipping based on visibility to save yourself from processing those items at all.
// The clipper calculates the range of visible items and advance the cursor to compensate for the non-visible items we have skipped.
// ImGui already clip items based on their bounds but it needs to measure text size to do so. Coarse clipping before submission makes this cost and your own data fetching/submission cost null.
// Usage:
//     ImGuiListClipper clipper(1000);  // we have 1000 elements, evenly spaced.
//     while (clipper.Step())
//         for (int i = clipper.DisplayStart; i < clipper.DisplayEnd; i++)
//             ImGui::Text("line number %d", i);
// - Step 0: the clipper let you process the first element, regardless of it being visible or not, so we can measure the element height (step skipped if we passed a known height as second arg to constructor).
// - Step 1: the clipper infer height from first element, calculate the actual range of elements to display, and position the cursor before the first element.
// - (Step 2: dummy step only required if an explicit items_height was passed to constructor or Begin() and user call Step(). Does nothing and switch to Step 3.)
// - Step 3: the clipper validate that we have reached the expected Y position (corresponding to element DisplayEnd), advance the cursor to the end of the list and then returns 'false' to end the loop.
struct ImGuiListClipper {
    float StartPosY;
    float ItemsHeight;
    int   ItemsCount, StepNo, DisplayStart, DisplayEnd;

    // items_count:  Use -1 to ignore (you can call Begin later). Use INT_MAX if you don't know how many items you have (in which case the cursor won't be advanced in the final step).
    // items_height: Use -1.0f to be calculated automatically on first step. Otherwise pass in the distance between your items, typically GetTextLineHeightWithSpacing() or GetItemsLineHeightWithSpacing().
    // If you don't specify an items_height, you NEED to call Step(). If you specify items_height you may call the old Begin()/End() api directly, but prefer calling Step().
    ImGuiListClipper(int items_count = -1, float items_height = -1.0f) { Begin(items_count, items_height); } // NB: Begin() initialize every fields (as we allow user to call Begin/End multiple times on a same instance if they want).
    ~ImGuiListClipper() { IM_ASSERT(ItemsCount == -1); }                                                     // Assert if user forgot to call End() or Step() until false.

    IMGUI_API bool Step();                                             // Call until it returns false. The DisplayStart/DisplayEnd fields will be set and you can process/draw those items.
    IMGUI_API void Begin(int items_count, float items_height = -1.0f); // Automatically called by constructor if you passed 'items_count' or by Step() in Step 1.
    IMGUI_API void End();                                              // Automatically called on the last call of Step() that returns false.
};

//-----------------------------------------------------------------------------
// Draw List
// Hold a series of drawing commands. The user provides a renderer for ImDrawData which essentially contains an array of ImDrawList.
//-----------------------------------------------------------------------------

// Helpers macros to generate 32-bits encoded colors
#define IM_COL32(R, G, B, A) (((ImU32)(A) << 24) | ((ImU32)(B) << 16) | ((ImU32)(G) << 8) | ((ImU32)(R)))
#define IM_COL32_WHITE (0xFFFFFFFF)
#define IM_COL32_BLACK (0xFF000000)
#define IM_COL32_BLACK_TRANS (0x00000000) // Transparent black

// Draw callbacks for advanced uses.
// NB- You most likely do NOT need to use draw callbacks just to create your own widget or customized UI rendering (you can poke into the draw list for that)
// Draw callback may be useful for example, A) Change your GPU render state, B) render a complex 3D scene inside a UI element (without an intermediate texture/render target), etc.
// The expected behavior from your rendering function is 'if (cmd.UserCallback != NULL) cmd.UserCallback(parent_list, cmd); else RenderTriangles()'
typedef void (*ImDrawCallback)(const ImDrawList *parent_list, const ImDrawCmd *cmd);

// Typically, 1 command = 1 gpu draw call (unless command is a callback)
struct ImDrawCmd {
    unsigned int   ElemCount;        // Number of indices (multiple of 3) to be rendered as triangles. Vertices are stored in the callee ImDrawList's vtx_buffer[] array, indices in idx_buffer[].
    ImVec4         ClipRect;         // Clipping rectangle (x1, y1, x2, y2)
    ImDrawCallback UserCallback;     // If != NULL, call the function instead of rendering the vertices. clip_rect and texture_id will be set normally.
    void *         UserCallbackData; // The draw callback code can access this.

    ImDrawCmd() {
        ElemCount  = 0;
        ClipRect.x = ClipRect.y = -8192.0f;
        ClipRect.z = ClipRect.w = +8192.0f;
        UserCallback            = NULL;
        UserCallbackData        = NULL;
    }
};

// Vertex index (override with '#define ImDrawIdx unsigned int' inside in imconfig.h)
#ifndef ImDrawIdx
typedef unsigned short ImDrawIdx;
#endif


// Char layout
struct ImDrawChar {
    ImI32   c;
    ImVec2  pos;
    ImColor col;
};

// Draw channels are used by the Columns API to "split" the render list into different channels while building, so items of each column can be batched together.
// You can also use them to simulate drawing layers and submit primitives in a different order than how they will be rendered.
struct ImDrawChannel {
    ImVector<ImDrawCmd> CmdBuffer;
    ImVector<ImDrawIdx> IdxBuffer;
};

// Draw command list
// This is the low-level list of polygons that ImGui functions are filling. At the end of the frame, all command lists are passed to your ImGuiIO::RenderDrawListFn function for rendering.
// At the moment, each ImGui window contains its own ImDrawList but they could potentially be merged in the future.
// If you want to add custom rendering within a window, you can use ImGui::GetWindowDrawList() to access the current draw list and add your own primitives.
// You can interleave normal ImGui:: calls and adding primitives to the current draw list.
// All positions are in screen coordinates (0,0=top-left, 1 pixel per unit). Primitives are always added to the list and not culled (culling is done at render time and at a higher-level by ImGui:: functions).
struct ImDrawList {
    // This is what you have to render
    ImVector<ImDrawCmd>  CmdBuffer; // Commands. Typically 1 command = 1 gpu draw call.
    ImVector<ImDrawIdx>  IdxBuffer; // Index buffer. Each command consume ImDrawCmd::ElemCount of those
    ImVector<ImDrawChar> VtxBuffer; // Vertex buffer.

    // [Internal, used while building lists]
    const char *            _OwnerName;       // Pointer to owner window's name (if any) for debugging
    unsigned int            _VtxCurrentIdx;   // [Internal] == VtxBuffer.Size
    ImDrawChar *            _VtxWritePtr;     // [Internal] point within VtxBuffer.Data after each add command (to avoid using the ImVector<> operators too much)
    ImDrawIdx *             _IdxWritePtr;     // [Internal] point within IdxBuffer.Data after each add command (to avoid using the ImVector<> operators too much)
    ImVector<ImVec4>        _ClipRectStack;   // [Internal]
    ImVector<ImVec2>        _Path;            // [Internal] current path building
    int                     _ChannelsCurrent; // [Internal] current channel number (0)
    int                     _ChannelsCount;   // [Internal] number of active channels (1+)
    ImVector<ImDrawChannel> _Channels;        // [Internal] draw channels for columns API (not resized down so _ChannelsCount may be smaller than _Channels.Size)

    ImDrawList() {
        _OwnerName = NULL;
        Clear();
    }
    ~ImDrawList() { ClearFreeMemory(); }
    IMGUI_API void PushClipRect(ImVec2 clip_rect_min, ImVec2 clip_rect_max, bool intersect_with_current_clip_rect = false); // Render-level scissoring. This is passed down to your render function but not used for CPU-side coarse clipping. Prefer using higher-level ImGui::PushClipRect() to affect logic (hit-testing and widget culling)
    IMGUI_API void PushClipRectFullScreen();
    IMGUI_API void PopClipRect();

    // Primitives
    IMGUI_API void AddLine(const ImVec2 &a, const ImVec2 &b, const ImColor &col, int ch = L'─');
    IMGUI_API void AddRectFilled(const ImVec2 &a, const ImVec2 &b, const ImColor &col, float rounding = 0.0f, int rounding_corners = 0x0F); // a: upper-left, b: lower-right
    IMGUI_API void AddQuad(const ImVec2 &a, const ImVec2 &b, const ImVec2 &c, const ImVec2 &d, const ImColor &col, float thickness = 1.0f);
    IMGUI_API void AddQuadFilled(const ImVec2 &a, const ImVec2 &b, const ImVec2 &c, const ImVec2 &d, const ImColor &col);
    IMGUI_API void AddTriangle(const ImVec2 &a, const ImVec2 &b, const ImVec2 &c, const ImColor &col, float thickness = 1.0f);
    IMGUI_API void AddTriangleFilled(const ImVec2 &a, const ImVec2 &b, const ImVec2 &c, const ImColor &col);
    IMGUI_API void AddCircle(const ImVec2 &centre, float radius, const ImColor &col, int num_segments = 12, float thickness = 1.0f);
    IMGUI_API void AddCircleFilled(const ImVec2 &centre, float radius, const ImColor &col, int num_segments = 12);
    IMGUI_API void AddText(const ImVec2 &pos, const ImColor &col, const char *text_begin, const char *text_end = NULL);
    IMGUI_API void AddTextEx(const ImVec2 &pos, const ImColor &col, const char *text_begin, const char *text_end = NULL, float wrap_width = 0.0f, const ImVec4 *cpu_fine_clip_rect = NULL);
    IMGUI_API void AddChar(const ImVec2 &pos, const ImColor &col, int ch);
    //IMGUI_API void AddPolyline(const ImVec2 *points, const int num_points, const ImColor& col, bool closed, float thickness, bool anti_aliased);
    IMGUI_API void AddConvexPolyFilled(const ImVec2 *points, const int num_points, const ImColor &col, bool anti_aliased);

    // Stateful path API, add points then finish with PathFill() or PathStroke()
    inline void PathClear() { _Path.resize(0); }
    inline void PathLineTo(const ImVec2 &pos) { _Path.push_back(pos); }
    inline void PathLineToMergeDuplicate(const ImVec2 &pos) {
        if(_Path.Size == 0 || memcmp(&_Path[_Path.Size - 1], &pos, 8) != 0)
            _Path.push_back(pos);
    }
    inline void PathFill(const ImColor &col) {
        AddConvexPolyFilled(_Path.Data, _Path.Size, col, true);
        PathClear();
    }

    IMGUI_API void PathRect(const ImVec2 &rect_min, const ImVec2 &rect_max, float rounding = 0.0f, int rounding_corners = 0x0F);

    // Channels
    // - Use to simulate layers. By switching channels to can render out-of-order (e.g. submit foreground primitives before background primitives)
    // - Use to minimize draw calls (e.g. if going back-and-forth between multiple non-overlapping clipping rectangles, prefer to append into separate channels then merge at the end)
    IMGUI_API void ChannelsSplit(int channels_count);
    IMGUI_API void ChannelsMerge();
    IMGUI_API void ChannelsSetCurrent(int channel_index);

    // Advanced
    IMGUI_API void AddCallback(ImDrawCallback callback, void *callback_data); // Your rendering function must check for 'UserCallback' in ImDrawCmd and call the function instead of rendering triangles.
    IMGUI_API void AddDrawCmd();                                              // This is useful if you need to forcefully create a new draw call (to allow for dependent rendering / blending). Otherwise primitives are merged into the same draw-call as much as possible

    // Internal helpers
    // NB: all primitives needs to be reserved via PrimReserve() beforehand!
    IMGUI_API void Clear();
    IMGUI_API void ClearFreeMemory();
    IMGUI_API void PrimReserve(int idx_count, int vtx_count);
    inline void PrimWriteChar(const ImVec2 &pos, ImI32 c, const ImColor &col) {
        _VtxWritePtr->pos = pos;
        _VtxWritePtr->c   = c;
        _VtxWritePtr->col = col;
        _VtxWritePtr++;
        _VtxCurrentIdx++;
    }
	inline void PrimWriteIdx(ImDrawIdx idx) {
        *_IdxWritePtr = idx;
        _IdxWritePtr++;
    }
    inline void PrimChar(const ImVec2 &pos, ImI32 c, const ImColor &col) {
        PrimWriteIdx((ImDrawIdx)_VtxCurrentIdx);
        PrimWriteChar(pos, c, col);
    }
    IMGUI_API void UpdateClipRect();
};

 // All draw data to render an ImGui frame
struct ImDrawData {
    bool         Valid; // Only valid after Render() is called and before the next NewFrame() is called.
    ImDrawList **CmdLists;
    int          CmdListsCount;
    int          TotalVtxCount; // For convenience, sum of all cmd_lists vtx_buffer.Size
    int          TotalIdxCount; // For convenience, sum of all cmd_lists idx_buffer.Size

    // Functions
    ImDrawData() {
        Valid         = false;
        CmdLists      = NULL;
        CmdListsCount = TotalVtxCount = TotalIdxCount = 0;
    }
    IMGUI_API void DeIndexAllBuffers();              // For backward compatibility: convert all buffers from indexed to de-indexed, in case you cannot render indexed. Note: this is slow and most likely a waste of resources. Always prefer indexed rendering!
    IMGUI_API void ScaleClipRects(const ImVec2 &sc); // Helper to scale the ClipRect field of each ImDrawCmd. Use if your final output buffer is at a different scale than ImGui expects, or if there is a difference between your window resolution and framebuffer resolution.
};

ImVec2 TrCalcTextSizeA(float size, float max_width, float wrap_width, const char *text_begin, const char *text_end, const char **remaining);

#if defined(__clang__)
#pragma clang diagnostic pop
#endif

//---- Include imgui_user.h at the end of imgui.h
//---- So you can include code that extends ImGui using any of the types declared above.
//---- (also convenient for user to only explicitly include vanilla imgui.h)
#ifdef IMGUI_INCLUDE_IMGUI_USER_H
#include "imgui_user.h"
#endif