/*
 Nuklear - v1.00 - public domain
 no warrenty implied; use at your own risk.
 authored from 2015-2016 by Micha Mettke

ABOUT:
    This is a minimal state immediate mode graphical user interface single header
    toolkit written in ANSI C and licensed under public domain.
    It was designed as a simple embeddable user interface for application and does
    not have any dependencies, a default renderbackend or OS window and input handling
    but instead provides a very modular library approach by using simple input state
    for input and draw commands describing primitive shapes as output.
    So instead of providing a layered library that tries to abstract over a number
    of platform and render backends it only focuses on the actual UI.

VALUES:
    - Immediate mode graphical user interface toolkit
    - Single header library
    - Written in C89 (ANSI C)
    - Small codebase (~15kLOC)
    - Focus on portability, efficiency and simplicity
    - No dependencies (not even the standard library if not wanted)
    - Fully skinnable and customizable
    - Low memory footprint with total memory control if needed or wanted
    - UTF-8 support
    - No global or hidden state
    - Customizable library modules (you can compile and use only what you need)
    - Optional font baker and vertex buffer output

USAGE:
    This library is self contained in one single header file and can be used either
    in header only mode or in implementation mode. The header only mode is used
    by default when included and allows including this header in other headers
    and does not contain the actual implementation.

    The implementation mode requires to define  the preprocessor macro
    NK_IMPLEMENTATION in *one* .c/.cpp file before #includeing this file, e.g.:

        #define NK_IMPLEMENTATION
        #include "nuklear.h"

    Also optionally define the symbols listed in the section "OPTIONAL DEFINES"
    below in implementation mode if you want to use additional functionality
    or need more control over the library.

FEATURES:
    - Absolutely no platform dependent code
    - Memory management control ranging from/to
        - Ease of use by allocating everything from the standard library
        - Control every byte of memory inside the library
    - Font handling control ranging from/to
        - Use your own font implementation to draw shapes/vertexes
        - Use this libraries internal font baking and handling API
    - Drawing output control ranging from/to
        - Simple shapes for more high level APIs which already having drawing capabilities
        - Hardware accessible anti-aliased vertex buffer output
    - Customizable colors and properties ranging from/to
        - Simple changes to color by filling a simple color table
        - Complete control with ability to use skinning to decorate widgets
    - Bendable UI library with widget ranging from/to
        - Basic widgets like buttons, checkboxes, slider, ...
        - Advanced widget like abstract comboboxes, contextual menus,...
    - Compile time configuration to only compile what you need
        - Subset which can be used if you do not want to link or use the standard library
    - Can be easily modified only update on user input instead of frame updates

OPTIONAL DEFINES:
    NK_PRIVATE
        If defined declares all functions as static, so they can only be accessed
        for the file that creates the implementation

    NK_INCLUDE_FIXED_TYPES
        If defined it will include header <stdint.h> for fixed sized types
        otherwise you have to select the correct types.

    NK_INCLUDE_DEFAULT_ALLOCATOR
        if defined it will include header <stdlib.h> and provide additional functions
        to use this library without caring for memory allocation control and therefore
        ease memory management.
        IMPORTANT:  this adds the standard library with malloc and free so don't define
                    if you don't want to link to the standard library!

    NK_INCLUDE_STANDARD_IO
        if defined it will include header <stdio.h> and <stdarg.h> and provide
        additional functions depending on file loading and variable arguments
        IMPORTANT:  this adds the standard library with fopen, fclose,...
                    as well as va_list,... so don't define this
                    if you don't want to link to the standard library!

    NK_INCLUDE_VERTEX_BUFFER_OUTPUT
        Defining this adds a vertex draw command list backend to this
        library, which allows you to convert queue commands into vertex draw commands.
        This is mainly if you need a hardware accessible format for OpenGL, DirectX,
        Vulkan, Metal,...

    NK_INCLUDE_FONT_BAKING
        Defining this adds the `stb_truetype` and `stb_rect_pack` implementation
        to this library and provides a default font for font loading and rendering.
        If you already have font handling or do not want to use this font handler
        you don't have to define it.

    NK_INCLUDE_DEFAULT_FONT
        Defining this adds the default font: ProggyClean.ttf font into this library
        which can be loaded into a font atlas and allows using this library without
        having a truetype font
        IMPORTANT: enabling this adds ~12kb to global stack memory

    NK_INCLUDE_COMMAND_USERDATA
        Defining this adds a userdata pointer into each command. Can be useful for
        example if you want to provide custom shader depending on the used widget.
        Can be combined with the style structures.

    NK_BUTTON_TRIGGER_ON_RELEASE
        Different platforms require button clicks occuring either on buttons being
        pressed (up to down) or released (down to up).
        By default this library will react on buttons being pressed, but if you
        define this it will only trigger if a button is released.

    NK_ASSERT
        If you don't define this, nuklear will use <assert.h> with assert().
        IMPORTANT:  it also adds the standard library so define to nothing of not wanted!

    NK_BUFFER_DEFAULT_INITIAL_SIZE
        Initial buffer size allocated by all buffers while using the default allocator
        functions included by defining NK_INCLUDE_DEFAULT_ALLOCATOR. If you don't
        want to allocate the default 4k memory then redefine it.

    NK_MAX_NUMBER_BUFFER
        Maximum buffer size for the conversion buffer between float and string
        Under normal circumstances this should be more than sufficient.

    NK_INPUT_MAX
        Defines the max number of bytes which can be added as text input in one frame.
        Under normal circumstances this should be more than sufficient.

    NK_MEMSET
        You can define this to 'memset' or your own memset implementation
        replacement. If not nuklear will use its own version.

    NK_MEMCOPY
        You can define this to 'memcpy' or your own memset implementation
        replacement. If not nuklear will use its own version.

    NK_SQRT
        You can define this to 'sqrt' or your own sqrt implementation
        replacement. If not nuklear will use its own slow and not highly
        accurate version.

    NK_SIN
        You can define this to 'sinf' or your own sine implementation
        replacement. If not nuklear will use its own approximation implementation.

    NK_COS
        You can define this to 'cosf' or your own cosine implementation
        replacement. If not nuklear will use its own approximation implementation.

    NK_BYTE
    NK_INT16
    NK_UINT16
    NK_INT32
    NK_UINT32
    NK_SIZE_TYPE
    NK_POINTER_TYPE
        If you compile without NK_USE_FIXED_TYPE then a number of standard types
        will be selected and compile time validated. If they are incorrect you can
        define the correct types.

CREDITS:
    Developed by Micha Mettke and every direct or indirect contributor to the GitHub.

    Embeds stb_texedit, stb_truetype and stb_rectpack by Sean Barret (public domain)
    Embeds ProggyClean.ttf font by Tristan Grimmer (MIT license).

    Big thank you to Omar Cornut (ocornut@github) for his imgui library and
    giving me the inspiration for this library, Casey Muratori for handmade hero
    and his original immediate mode graphical user interface idea and Sean
    Barret for his amazing single header libraries which restored by faith
    in libraries and brought me to create some of my own.

LICENSE:
    This software is dual-licensed to the public domain and under the following
    license: you are granted a perpetual, irrevocable license to copy, modify,
    publish and distribute this file as you see fit.
*/

#ifndef NK_H_
#define NK_H_

#ifdef __cplusplus
extern "C" {
#endif
/*
 * ==============================================================
 *
 *                          CONSTANTS
 *
 * ===============================================================
 */

#define NK_UTF_INVALID 0xFFFD /* internal invalid utf8 rune */
#define NK_UTF_SIZE 4 /* describes the number of bytes a glyph consists of*/
#ifndef NK_INPUT_MAX
#define NK_INPUT_MAX 16
#endif
#ifndef NK_MAX_NUMBER_BUFFER
#define NK_MAX_NUMBER_BUFFER 64
#endif
/*
 * ===============================================================
 *
 *                          BASIC
 *
 * ===============================================================
 */

#ifdef NK_INCLUDE_FIXED_TYPES
#include <stdint.h>
typedef int16_t nk_short;
typedef uint16_t nk_ushort;
typedef int32_t nk_int;
typedef uint32_t nk_uint;
typedef uint32_t nk_hash;
typedef uintptr_t nk_size;
typedef uintptr_t nk_ptr;
typedef uint32_t nk_flags;
typedef uint32_t nk_rune;
typedef uint8_t nk_byte;
#else
#ifndef NK_BYTE
typedef unsigned char nk_byte;
#else
typedef NK_BYTE nk_byte;
#endif
#ifndef NK_INT16
typedef short nk_short;
#else
typedef NK_INT16 nk_short;
#endif
#ifndef NK_UINT16
typedef unsigned short nk_ushort;
#else
typedef NK_UINT16 nk_ushort;
#endif
#ifndef NK_INT32
typedef int nk_int;
#else
typedef NK_INT32 nk_int;
#endif
#ifndef NK_UINT32
typedef unsigned int nk_uint;
#else
typedef NK_UINT32 nk_uint;
#endif
#ifndef NK_SIZE_TYPE
typedef unsigned long nk_size;
#else
typedef NK_SIZE_TYPE nk_size;
#endif
#ifndef NK_POINTER_TYPE
typedef unsigned long nk_ptr;
#else
typedef NK_POINTER_TYPE nk_ptr;
#endif
typedef unsigned int nk_hash;
typedef unsigned int nk_flags;
typedef nk_uint nk_rune;
typedef unsigned char nk_byte;
#endif

#ifdef NK_PRIVATE
#define NK_API static
#else
#define NK_API extern
#endif

#define NK_INTERN static
#define NK_STORAGE static
#define NK_GLOBAL static

/* ============================================================================
 *
 *                                  API
 *
 * =========================================================================== */

#define NK_UNDEFINED (-1.0f)
#define NK_FLAG(x) (1 << (x))
#define NK_STRINGIFY(x) #x
#define NK_LINE_STR(x) NK_STRINGIFY(x)
#define NK_FILE_LINE __FILE__ ":" NK_LINE_STR(__LINE__)

struct nk_buffer;
struct nk_allocator;
struct nk_command_buffer;
struct nk_draw_command;
struct nk_convert_config;
struct nk_text_edit;
struct nk_draw_list;
struct nk_user_font;
struct nk_panel;
struct nk_context;

enum {nk_false, nk_true};
struct nk_color {nk_byte r,g,b,a;};
struct nk_vec2 {float x,y;};
struct nk_vec2i {short x, y;};
struct nk_rect {float x,y,w,h;};
struct nk_recti {short x,y,w,h;};
typedef char nk_glyph[NK_UTF_SIZE];
typedef union {void *ptr; int id;} nk_handle;
struct nk_image {nk_handle handle;unsigned short w,h;unsigned short region[4];};
struct nk_scroll {unsigned short x, y;};
enum nk_heading {NK_UP, NK_RIGHT, NK_DOWN, NK_LEFT};

typedef int(*nk_filter)(const struct nk_text_edit*, nk_rune unicode);
typedef void(*nk_paste_f)(nk_handle, struct nk_text_edit*);
typedef void(*nk_copy_f)(nk_handle, const char*, int len);

enum nk_button_behavior {NK_BUTTON_DEFAULT,NK_BUTTON_REPEATER};
enum nk_modify          {NK_FIXED=nk_false,NK_MODIFIABLE=nk_true};
enum nk_orientation     {NK_VERTICAL,NK_HORIZONTAL};
enum nk_collapse_states {NK_MINIMIZED=nk_false,NK_MAXIMIZED = nk_true};
enum nk_show_states     {NK_HIDDEN=nk_false,NK_SHOWN=nk_true};
enum nk_chart_type      {NK_CHART_LINES,NK_CHART_COLUMN,NK_CHART_MAX};
enum nk_chart_event     {NK_CHART_HOVERING=0x01, NK_CHART_CLICKED=0x02};
enum nk_color_format    {NK_RGB, NK_RGBA};
enum nk_popup_type      {NK_POPUP_STATIC,NK_POPUP_DYNAMIC};
enum nk_layout_format   {NK_DYNAMIC,NK_STATIC};
enum nk_tree_type       {NK_TREE_NODE,NK_TREE_TAB};
enum nk_anti_aliasing   {NK_ANTI_ALIASING_OFF,NK_ANTI_ALIASING_ON};

struct nk_allocator {
    nk_handle userdata;
    void*(*alloc)(nk_handle, void *old, nk_size);
    void(*free)(nk_handle, void*);
};

struct nk_draw_null_texture {
    nk_handle texture;/* texture handle to a texture with a white pixel */
    struct nk_vec2 uv; /* coordinates to a white pixel in the texture  */
};
struct nk_convert_config {
    float global_alpha; /* global alpha value */
    enum nk_anti_aliasing line_AA; /* line anti-aliasing flag can be turned off if you are tight on memory */
    enum nk_anti_aliasing shape_AA; /* shape anti-aliasing flag can be turned off if you are tight on memory */
    unsigned int circle_segment_count; /* number of segments used for circles: default to 22 */
    unsigned int arc_segment_count; /* number of segments used for arcs: default to 22 */
    unsigned int curve_segment_count; /* number of segments used for curves: default to 22 */
    struct nk_draw_null_texture null; /* handle to texture with a white pixel for shape drawing */
};

enum nk_symbol_type {
    NK_SYMBOL_NONE,
    NK_SYMBOL_X,
    NK_SYMBOL_UNDERSCORE,
    NK_SYMBOL_CIRCLE,
    NK_SYMBOL_CIRCLE_FILLED,
    NK_SYMBOL_RECT,
    NK_SYMBOL_RECT_FILLED,
    NK_SYMBOL_TRIANGLE_UP,
    NK_SYMBOL_TRIANGLE_DOWN,
    NK_SYMBOL_TRIANGLE_LEFT,
    NK_SYMBOL_TRIANGLE_RIGHT,
    NK_SYMBOL_PLUS,
    NK_SYMBOL_MINUS,
    NK_SYMBOL_MAX
};

enum nk_keys {
    NK_KEY_NONE,
    NK_KEY_SHIFT,
    NK_KEY_CTRL,
    NK_KEY_DEL,
    NK_KEY_ENTER,
    NK_KEY_TAB,
    NK_KEY_BACKSPACE,
    NK_KEY_COPY,
    NK_KEY_CUT,
    NK_KEY_PASTE,
    NK_KEY_UP,
    NK_KEY_DOWN,
    NK_KEY_LEFT,
    NK_KEY_RIGHT,
    NK_KEY_TEXT_INSERT_MODE,
    NK_KEY_TEXT_LINE_START,
    NK_KEY_TEXT_LINE_END,
    NK_KEY_TEXT_START,
    NK_KEY_TEXT_END,
    NK_KEY_TEXT_UNDO,
    NK_KEY_TEXT_REDO,
    NK_KEY_TEXT_WORD_LEFT,
    NK_KEY_TEXT_WORD_RIGHT,
    NK_KEY_MAX
};

enum nk_buttons {
    NK_BUTTON_LEFT,
    NK_BUTTON_MIDDLE,
    NK_BUTTON_RIGHT,
    NK_BUTTON_MAX
};

enum nk_style_colors {
    NK_COLOR_TEXT,
    NK_COLOR_WINDOW,
    NK_COLOR_HEADER,
    NK_COLOR_BORDER,
    NK_COLOR_BUTTON,
    NK_COLOR_BUTTON_HOVER,
    NK_COLOR_BUTTON_ACTIVE,
    NK_COLOR_TOGGLE,
    NK_COLOR_TOGGLE_HOVER,
    NK_COLOR_TOGGLE_CURSOR,
    NK_COLOR_SELECT,
    NK_COLOR_SELECT_ACTIVE,
    NK_COLOR_SLIDER,
    NK_COLOR_SLIDER_CURSOR,
    NK_COLOR_SLIDER_CURSOR_HOVER,
    NK_COLOR_SLIDER_CURSOR_ACTIVE,
    NK_COLOR_PROPERTY,
    NK_COLOR_EDIT,
    NK_COLOR_EDIT_CURSOR,
    NK_COLOR_COMBO,
    NK_COLOR_CHART,
    NK_COLOR_CHART_COLOR,
    NK_COLOR_CHART_COLOR_HIGHLIGHT,
    NK_COLOR_SCROLLBAR,
    NK_COLOR_SCROLLBAR_CURSOR,
    NK_COLOR_SCROLLBAR_CURSOR_HOVER,
    NK_COLOR_SCROLLBAR_CURSOR_ACTIVE,
    NK_COLOR_TAB_HEADER,
    NK_COLOR_COUNT
};

enum nk_widget_layout_states {
    NK_WIDGET_INVALID, /* The widget cannot be seen and is completely out of view */
    NK_WIDGET_VALID, /* The widget is completely inside the window and can be updated and drawn */
    NK_WIDGET_ROM /* The widget is partially visible and cannot be updated */
};

/* widget states */
enum nk_widget_states {
    NK_WIDGET_STATE_MODIFIED    = NK_FLAG(1),
    NK_WIDGET_STATE_INACTIVE    = NK_FLAG(2), /* widget is neither active nor hovered */
    NK_WIDGET_STATE_ENTERED     = NK_FLAG(3), /* widget has been hovered on the current frame */
    NK_WIDGET_STATE_HOVER       = NK_FLAG(4), /* widget is being hovered */
    NK_WIDGET_STATE_ACTIVED     = NK_FLAG(5),/* widget is currently activated */
    NK_WIDGET_STATE_LEFT        = NK_FLAG(6), /* widget is from this frame on not hovered anymore */
    NK_WIDGET_STATE_HOVERED     = NK_WIDGET_STATE_HOVER|NK_WIDGET_STATE_MODIFIED, /* widget is being hovered */
    NK_WIDGET_STATE_ACTIVE      = NK_WIDGET_STATE_ACTIVED|NK_WIDGET_STATE_MODIFIED /* widget is currently activated */
};

/* text alignment */
enum nk_text_align {
    NK_TEXT_ALIGN_LEFT        = 0x01,
    NK_TEXT_ALIGN_CENTERED    = 0x02,
    NK_TEXT_ALIGN_RIGHT       = 0x04,
    NK_TEXT_ALIGN_TOP         = 0x08,
    NK_TEXT_ALIGN_MIDDLE      = 0x10,
    NK_TEXT_ALIGN_BOTTOM      = 0x20
};
enum nk_text_alignment {
    NK_TEXT_LEFT        = NK_TEXT_ALIGN_MIDDLE|NK_TEXT_ALIGN_LEFT,
    NK_TEXT_CENTERED    = NK_TEXT_ALIGN_MIDDLE|NK_TEXT_ALIGN_CENTERED,
    NK_TEXT_RIGHT       = NK_TEXT_ALIGN_MIDDLE|NK_TEXT_ALIGN_RIGHT
};

enum nk_edit_flags {
    NK_EDIT_DEFAULT                 = 0,
    NK_EDIT_READ_ONLY               = NK_FLAG(0),
    NK_EDIT_AUTO_SELECT             = NK_FLAG(1),
    NK_EDIT_SIG_ENTER               = NK_FLAG(2),
    NK_EDIT_ALLOW_TAB               = NK_FLAG(3),
    NK_EDIT_NO_CURSOR               = NK_FLAG(4),
    NK_EDIT_SELECTABLE              = NK_FLAG(5),
    NK_EDIT_CLIPBOARD               = NK_FLAG(6),
    NK_EDIT_CTRL_ENTER_NEWLINE      = NK_FLAG(7),
    NK_EDIT_NO_HORIZONTAL_SCROLL    = NK_FLAG(8),
    NK_EDIT_ALWAYS_INSERT_MODE      = NK_FLAG(9),
    NK_EDIT_MULTILINE               = NK_FLAG(11)
};
enum nk_edit_types {
    NK_EDIT_SIMPLE  = NK_EDIT_ALWAYS_INSERT_MODE,
    NK_EDIT_FIELD   = NK_EDIT_SIMPLE|NK_EDIT_SELECTABLE,
    NK_EDIT_BOX     = NK_EDIT_ALWAYS_INSERT_MODE| NK_EDIT_SELECTABLE|
                        NK_EDIT_MULTILINE|NK_EDIT_ALLOW_TAB
};
enum nk_edit_events {
    NK_EDIT_ACTIVE      = NK_FLAG(0), /* edit widget is currently being modified */
    NK_EDIT_INACTIVE    = NK_FLAG(1), /* edit widget is not active and is not being modified */
    NK_EDIT_ACTIVATED   = NK_FLAG(2), /* edit widget went from state inactive to state active */
    NK_EDIT_DEACTIVATED = NK_FLAG(3), /* edit widget went from state active to state inactive */
    NK_EDIT_COMMITED    = NK_FLAG(4) /* edit widget has received an enter and lost focus */
};

enum nk_panel_flags {
    NK_WINDOW_BORDER        = NK_FLAG(0), /* Draws a border around the window to visually separate the window * from the background */
    NK_WINDOW_BORDER_HEADER = NK_FLAG(1), /* Draws a border between window header and body */
    NK_WINDOW_MOVABLE       = NK_FLAG(2), /* The movable flag indicates that a window can be moved by user input or * by dragging the window header */
    NK_WINDOW_SCALABLE      = NK_FLAG(3), /* The scalable flag indicates that a window can be scaled by user input * by dragging a scaler icon at the button of the window */
    NK_WINDOW_CLOSABLE      = NK_FLAG(4), /* adds a closable icon into the header */
    NK_WINDOW_MINIMIZABLE   = NK_FLAG(5), /* adds a minimize icon into the header */
    NK_WINDOW_DYNAMIC       = NK_FLAG(6), /* special window type growing up in height while being filled to a * certain maximum height */
    NK_WINDOW_NO_SCROLLBAR  = NK_FLAG(7), /* Removes the scrollbar from the window */
    NK_WINDOW_TITLE         = NK_FLAG(8) /* Forces a header at the top at the window showing the title */
};

/* context */
#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API int                      nk_init_default(struct nk_context*, const struct nk_user_font*);
#endif
NK_API int                      nk_init_fixed(struct nk_context*, void *memory, nk_size size, const struct nk_user_font*);
NK_API int                      nk_init_custom(struct nk_context*, struct nk_buffer *cmds, struct nk_buffer *pool, const struct nk_user_font*);
NK_API int                      nk_init(struct nk_context*, struct nk_allocator*, const struct nk_user_font*);
NK_API void                     nk_clear(struct nk_context*);
NK_API void                     nk_free(struct nk_context*);
#ifdef NK_INCLUDE_COMMAND_USERDATA
NK_API void                     nk_set_user_data(struct nk_context*, nk_handle handle);
#endif

/* window */
NK_API int                      nk_begin(struct nk_context*, struct nk_panel*, const char *title, struct nk_rect bounds, nk_flags flags);
NK_API void                     nk_end(struct nk_context*);

NK_API struct nk_window*        nk_window_find(struct nk_context *ctx, const char *name);
NK_API struct nk_rect           nk_window_get_bounds(const struct nk_context*);
NK_API struct nk_vec2           nk_window_get_position(const struct nk_context*);
NK_API struct nk_vec2           nk_window_get_size(const struct nk_context*);
NK_API float                    nk_window_get_width(const struct nk_context*);
NK_API float                    nk_window_get_height(const struct nk_context*);
NK_API struct nk_panel*         nk_window_get_panel(struct nk_context*);
NK_API struct nk_rect           nk_window_get_content_region(struct nk_context*);
NK_API struct nk_vec2           nk_window_get_content_region_min(struct nk_context*);
NK_API struct nk_vec2           nk_window_get_content_region_max(struct nk_context*);
NK_API struct nk_vec2           nk_window_get_content_region_size(struct nk_context*);
NK_API struct nk_command_buffer* nk_window_get_canvas(struct nk_context*);

NK_API int                      nk_window_has_focus(const struct nk_context*);
NK_API int                      nk_window_is_collapsed(struct nk_context*, const char*);
NK_API int                      nk_window_is_closed(struct nk_context*, const char*);
NK_API int                      nk_window_is_active(struct nk_context*, const char*);
NK_API int                      nk_window_is_hovered(struct nk_context*);
NK_API int                      nk_window_is_any_hovered(struct nk_context*);
NK_API int                      nk_item_is_any_active(struct nk_context*);

NK_API void                     nk_window_set_bounds(struct nk_context*, struct nk_rect);
NK_API void                     nk_window_set_position(struct nk_context*, struct nk_vec2);
NK_API void                     nk_window_set_size(struct nk_context*, struct nk_vec2);
NK_API void                     nk_window_set_focus(struct nk_context*, const char *name);

NK_API void                     nk_window_close(struct nk_context *ctx, const char *name);
NK_API void                     nk_window_collapse(struct nk_context*, const char *name, enum nk_collapse_states);
NK_API void                     nk_window_collapse_if(struct nk_context*, const char *name, enum nk_collapse_states, int cond);
NK_API void                     nk_window_show(struct nk_context*, const char *name, enum nk_show_states);
NK_API void                     nk_window_show_if(struct nk_context*, const char *name, enum nk_show_states, int cond);

/* Layout */
NK_API void                     nk_layout_row_dynamic(struct nk_context*, float height, int cols);
NK_API void                     nk_layout_row_static(struct nk_context*, float height, int item_width, int cols);

NK_API void                     nk_layout_row_begin(struct nk_context*, enum nk_layout_format, float row_height, int cols);
NK_API void                     nk_layout_row_push(struct nk_context*, float value);
NK_API void                     nk_layout_row_end(struct nk_context*);
NK_API void                     nk_layout_row(struct nk_context*, enum nk_layout_format, float height, int cols, const float *ratio);

NK_API void                     nk_layout_space_begin(struct nk_context*, enum nk_layout_format, float height, int widget_count);
NK_API void                     nk_layout_space_push(struct nk_context*, struct nk_rect);
NK_API void                     nk_layout_space_end(struct nk_context*);

NK_API struct nk_rect           nk_layout_space_bounds(struct nk_context*);
NK_API struct nk_vec2           nk_layout_space_to_screen(struct nk_context*, struct nk_vec2);
NK_API struct nk_vec2           nk_layout_space_to_local(struct nk_context*, struct nk_vec2);
NK_API struct nk_rect           nk_layout_space_rect_to_screen(struct nk_context*, struct nk_rect);
NK_API struct nk_rect           nk_layout_space_rect_to_local(struct nk_context*, struct nk_rect);

/* Layout: Group */
NK_API int                      nk_group_begin(struct nk_context*, struct nk_panel*, const char *title, nk_flags);
NK_API void                     nk_group_end(struct nk_context*);

/* Layout: Tree */
#define                         nk_tree_push(ctx, type, title, state) nk_tree_push_hashed(ctx, type, title, state, __FILE__,nk_strlen(__FILE__),__LINE__)
#define                         nk_tree_push_id(ctx, type, title, state, id) nk_tree_push_hashed(ctx, type, title, state, NK_FILE_LINE,nk_strlen(NK_FILE_LINE),id)
NK_API int                      nk_tree_push_hashed(struct nk_context*, enum nk_tree_type, const char *title, enum nk_collapse_states initial_state, const char *hash, int len,int seed);
NK_API void                     nk_tree_pop(struct nk_context*);

/* Widgets */
NK_API void                     nk_text(struct nk_context*, const char*, int, nk_flags);
NK_API void                     nk_text_colored(struct nk_context*, const char*, int, nk_flags, struct nk_color);
NK_API void                     nk_text_wrap(struct nk_context*, const char*, int);
NK_API void                     nk_text_wrap_colored(struct nk_context*, const char*, int, struct nk_color);

NK_API void                     nk_label(struct nk_context*, const char*, nk_flags);
NK_API void                     nk_label_colored(struct nk_context*, const char*, nk_flags align, struct nk_color);
NK_API void                     nk_label_wrap(struct nk_context*, const char*);
NK_API void                     nk_label_colored_wrap(struct nk_context*, const char*, struct nk_color);
NK_API void                     nk_image(struct nk_context*, struct nk_image);
#ifdef NK_INCLUDE_STANDARD_IO
NK_API void                     nk_labelf(struct nk_context*, nk_flags, const char*, ...);
NK_API void                     nk_labelf_colored(struct nk_context*, nk_flags align, struct nk_color, const char*,...);
NK_API void                     nk_labelf_wrap(struct nk_context*, const char*,...);
NK_API void                     nk_labelf_colored_wrap(struct nk_context*, struct nk_color, const char*,...);

NK_API void                     nk_value_bool(struct nk_context*, const char *prefix, int);
NK_API void                     nk_value_int(struct nk_context*, const char *prefix, int);
NK_API void                     nk_value_uint(struct nk_context*, const char *prefix, unsigned int);
NK_API void                     nk_value_float(struct nk_context*, const char *prefix, float);
NK_API void                     nk_value_color_byte(struct nk_context*, const char *prefix, struct nk_color);
NK_API void                     nk_value_color_float(struct nk_context*, const char *prefix, struct nk_color);
NK_API void                     nk_value_color_hex(struct nk_context*, const char *prefix, struct nk_color);
#endif

/* Widgets: Buttons */
NK_API int                      nk_button_text(struct nk_context *ctx, const char *title, int len, enum nk_button_behavior);
NK_API int                      nk_button_label(struct nk_context *ctx, const char *title, enum nk_button_behavior);
NK_API int                      nk_button_color(struct nk_context*, struct nk_color, enum nk_button_behavior);
NK_API int                      nk_button_symbol(struct nk_context*, enum nk_symbol_type, enum nk_button_behavior);
NK_API int                      nk_button_image(struct nk_context*, struct nk_image img, enum nk_button_behavior);
NK_API int                      nk_button_symbol_label(struct nk_context*, enum nk_symbol_type, const char*, nk_flags text_alignment, enum nk_button_behavior);
NK_API int                      nk_button_symbol_text(struct nk_context*, enum nk_symbol_type, const char*, int, nk_flags alignment, enum nk_button_behavior);
NK_API int                      nk_button_image_label(struct nk_context*, struct nk_image img, const char*, nk_flags text_alignment, enum nk_button_behavior);
NK_API int                      nk_button_image_text(struct nk_context*, struct nk_image img, const char*, int, nk_flags alignment, enum nk_button_behavior);

/* Widgets: Checkbox */
NK_API int                      nk_check_label(struct nk_context*, const char*, int active);
NK_API int                      nk_check_text(struct nk_context*, const char*, int,int active);
NK_API unsigned                 nk_check_flags_label(struct nk_context*, const char*, unsigned int flags, unsigned int value);
NK_API unsigned                 nk_check_flags_text(struct nk_context*, const char*, int, unsigned int flags, unsigned int value);
NK_API int                      nk_checkbox_label(struct nk_context*, const char*, int *active);
NK_API int                      nk_checkbox_text(struct nk_context*, const char*, int, int *active);
NK_API int                      nk_checkbox_flags_label(struct nk_context*, const char*, unsigned int *flags, unsigned int value);
NK_API int                      nk_checkbox_flags_text(struct nk_context*, const char*, int, unsigned int *flags, unsigned int value);

/* Widgets: Radio */
NK_API int                      nk_radio_label(struct nk_context*, const char*, int *active);
NK_API int                      nk_radio_text(struct nk_context*, const char*, int, int *active);
NK_API int                      nk_option_label(struct nk_context*, const char*, int active);
NK_API int                      nk_option_text(struct nk_context*, const char*, int, int active);

/* Widgets: Selectable */
NK_API int                      nk_selectable_label(struct nk_context*, const char*, nk_flags align, int *value);
NK_API int                      nk_selectable_text(struct nk_context*, const char*, int, nk_flags align, int *value);
NK_API int                      nk_select_label(struct nk_context*, const char*, nk_flags align, int value);
NK_API int                      nk_select_text(struct nk_context*, const char*, int, nk_flags align, int value);

/* Widgets: Slider */
NK_API float                    nk_slide_float(struct nk_context*, float min, float val, float max, float step);
NK_API int                      nk_slide_int(struct nk_context*, int min, int val, int max, int step);
NK_API int                      nk_slider_float(struct nk_context*, float min, float *val, float max, float step);
NK_API int                      nk_slider_int(struct nk_context*, int min, int *val, int max, int step);

/* Widgets: Progressbar */
NK_API int                      nk_progress(struct nk_context*, nk_size *cur, nk_size max, int modifyable);
NK_API nk_size                  nk_prog(struct nk_context*, nk_size cur, nk_size max, int modifyable);

/* Widgets: Color picker */
NK_API struct nk_color          nk_color_picker(struct nk_context*, struct nk_color, enum nk_color_format);
NK_API int                      nk_color_pick(struct nk_context*, struct nk_color*, enum nk_color_format);

/* Widgets: Property */
NK_API void                     nk_property_float(struct nk_context *layout, const char *name, float min, float *val, float max, float step, float inc_per_pixel);
NK_API void                     nk_property_int(struct nk_context *layout, const char *name, int min, int *val, int max, int step, int inc_per_pixel);
NK_API float                    nk_propertyf(struct nk_context *layout, const char *name, float min, float val, float max, float step, float inc_per_pixel);
NK_API int                      nk_propertyi(struct nk_context *layout, const char *name, int min, int val, int max, int step, int inc_per_pixel);

/* Widgets: TextEdit */
NK_API nk_flags                 nk_edit_string(struct nk_context*, nk_flags, char *buffer, int *len, int max, nk_filter);
NK_API nk_flags                 nk_edit_buffer(struct nk_context*, nk_flags, struct nk_text_edit*, nk_filter);

/* Chart */
NK_API int                      nk_chart_begin(struct nk_context*, enum nk_chart_type, int num, float min, float max);
NK_API nk_flags                 nk_chart_push(struct nk_context*, float);
NK_API void                     nk_chart_end(struct nk_context*);
NK_API void                     nk_plot(struct nk_context*, enum nk_chart_type, const float *values, int count, int offset);
NK_API void                     nk_plot_function(struct nk_context*, enum nk_chart_type, void *userdata, float(*value_getter)(void* user, int index), int count, int offset);

/* Popups */
NK_API int                      nk_popup_begin(struct nk_context*, struct nk_panel*, enum nk_popup_type, const char*, nk_flags, struct nk_rect bounds);
NK_API void                     nk_popup_close(struct nk_context*);
NK_API void                     nk_popup_end(struct nk_context*);

/* Combobox */
NK_API int                      nk_combo(struct nk_context*, const char **items, int count, int selected, int item_height);
NK_API int                      nk_combo_separator(struct nk_context*, const char *items_separated_by_separator, int separator, int selected, int count, int item_height);
NK_API int                      nk_combo_string(struct nk_context*, const char *items_separated_by_zeros, int selected, int count, int item_height);
NK_API int                      nk_combo_callback(struct nk_context*, void(*item_getter)(void*, int, const char**), void *userdata, int selected, int count, int item_height);
NK_API void                     nk_combobox(struct nk_context*, const char **items, int count, int *selected, int item_height);
NK_API void                     nk_combobox_string(struct nk_context*, const char *items_separated_by_zeros, int *selected, int count, int item_height);
NK_API void                     nk_combobox_separator(struct nk_context*, const char *items_separated_by_separator, int separator,int *selected, int count, int item_height);
NK_API void                     nk_combobox_callback(struct nk_context*, void(*item_getter)(void*, int, const char**), void*, int *selected, int count, int item_height);

/* Combobox: abstract */
NK_API int                      nk_combo_begin_text(struct nk_context*, struct nk_panel*, const char *selected, int, int max_height);
NK_API int                      nk_combo_begin_label(struct nk_context*, struct nk_panel*, const char *selected, int max_height);
NK_API int                      nk_combo_begin_color(struct nk_context*, struct nk_panel*, struct nk_color color, int max_height);
NK_API int                      nk_combo_begin_symbol(struct nk_context*, struct nk_panel*, enum nk_symbol_type,  int max_height);
NK_API int                      nk_combo_begin_symbol_label(struct nk_context*, struct nk_panel*, const char *selected, enum nk_symbol_type, int height);
NK_API int                      nk_combo_begin_symbol_text(struct nk_context*, struct nk_panel*, const char *selected, int, enum nk_symbol_type, int height);
NK_API int                      nk_combo_begin_image(struct nk_context*, struct nk_panel*, struct nk_image img,  int max_height);
NK_API int                      nk_combo_begin_image_label(struct nk_context*, struct nk_panel*, const char *selected, struct nk_image, int height);
NK_API int                      nk_combo_begin_image_text(struct nk_context*, struct nk_panel*, const char *selected, int, struct nk_image, int height);
NK_API int                      nk_combo_item_label(struct nk_context*, const char*, nk_flags alignment);
NK_API int                      nk_combo_item_text(struct nk_context*, const char*,int, nk_flags alignment);
NK_API int                      nk_combo_item_image_label(struct nk_context*, struct nk_image, const char*, nk_flags alignment);
NK_API int                      nk_combo_item_image_text(struct nk_context*, struct nk_image, const char*, int,nk_flags alignment);
NK_API int                      nk_combo_item_symbol_label(struct nk_context*, enum nk_symbol_type, const char*, nk_flags alignment);
NK_API int                      nk_combo_item_symbol_text(struct nk_context*, enum nk_symbol_type, const char*, int, nk_flags alignment);
NK_API void                     nk_combo_close(struct nk_context*);
NK_API void                     nk_combo_end(struct nk_context*);

/* Contextual */
NK_API int                      nk_contextual_begin(struct nk_context*, struct nk_panel*, nk_flags, struct nk_vec2, struct nk_rect trigger_bounds);
NK_API int                      nk_contextual_item_text(struct nk_context*, const char*, int,nk_flags align);
NK_API int                      nk_contextual_item_label(struct nk_context*, const char*, nk_flags align);
NK_API int                      nk_contextual_item_image_label(struct nk_context*, struct nk_image, const char*, nk_flags alignment);
NK_API int                      nk_contextual_item_image_text(struct nk_context*, struct nk_image, const char*, int len, nk_flags alignment);
NK_API int                      nk_contextual_item_symbol_label(struct nk_context*, enum nk_symbol_type, const char*, nk_flags alignment);
NK_API int                      nk_contextual_item_symbol_text(struct nk_context*, enum nk_symbol_type, const char*, int, nk_flags alignment);
NK_API void                     nk_contextual_close(struct nk_context*);
NK_API void                     nk_contextual_end(struct nk_context*);

/* Tooltip */
NK_API void                     nk_tooltip(struct nk_context*, const char*);
NK_API int                      nk_tooltip_begin(struct nk_context*, struct nk_panel*, float width);
NK_API void                     nk_tooltip_end(struct nk_context*);

/* Menu */
NK_API void                     nk_menubar_begin(struct nk_context*);
NK_API void                     nk_menubar_end(struct nk_context*);
NK_API int                      nk_menu_begin_text(struct nk_context*, struct nk_panel*, const char*, int, nk_flags align, float width);
NK_API int                      nk_menu_begin_label(struct nk_context*, struct nk_panel*, const char*, nk_flags align, float width);
NK_API int                      nk_menu_begin_image(struct nk_context*, struct nk_panel*, const char*, struct nk_image, float width);
NK_API int                      nk_menu_begin_image_text(struct nk_context*, struct nk_panel*, const char*, int,nk_flags align,struct nk_image, float width);
NK_API int                      nk_menu_begin_image_label(struct nk_context*, struct nk_panel*, const char*, nk_flags align,struct nk_image, float width);
NK_API int                      nk_menu_begin_symbol(struct nk_context*, struct nk_panel*, const char*, enum nk_symbol_type, float width);
NK_API int                      nk_menu_begin_symbol_text(struct nk_context*, struct nk_panel*, const char*, int,nk_flags align,enum nk_symbol_type, float width);
NK_API int                      nk_menu_begin_symbol_label(struct nk_context*, struct nk_panel*, const char*, nk_flags align,enum nk_symbol_type, float width);
NK_API int                      nk_menu_item_text(struct nk_context*, const char*, int,nk_flags align);
NK_API int                      nk_menu_item_label(struct nk_context*, const char*, nk_flags alignment);
NK_API int                      nk_menu_item_image_label(struct nk_context*, struct nk_image, const char*, nk_flags alignment);
NK_API int                      nk_menu_item_image_text(struct nk_context*, struct nk_image, const char*, int len, nk_flags alignment);
NK_API int                      nk_menu_item_symbol_text(struct nk_context*, enum nk_symbol_type, const char*, int, nk_flags alignment);
NK_API int                      nk_menu_item_symbol_label(struct nk_context*, enum nk_symbol_type, const char*, nk_flags alignment);
NK_API void                     nk_menu_close(struct nk_context*);
NK_API void                     nk_menu_end(struct nk_context*);

/* Drawing*/
#define                         nk_foreach(c, ctx)for((c)=nk__begin(ctx); (c)!=0; (c)=nk__next(ctx, c))
#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
NK_API void                     nk_convert(struct nk_context*, struct nk_buffer *cmds, struct nk_buffer *vertices, struct nk_buffer *elements, const struct nk_convert_config*);
#define                         nk_draw_foreach(cmd,ctx, b) for((cmd)=nk__draw_begin(ctx, b); (cmd)!=0; (cmd)=nk__draw_next(cmd, b, ctx))
#endif

/* User Input */
NK_API void                     nk_input_begin(struct nk_context*);
NK_API void                     nk_input_motion(struct nk_context*, int x, int y);
NK_API void                     nk_input_key(struct nk_context*, enum nk_keys, int down);
NK_API void                     nk_input_button(struct nk_context*, enum nk_buttons, int x, int y, int down);
NK_API void                     nk_input_scroll(struct nk_context*, float y);
NK_API void                     nk_input_char(struct nk_context*, char);
NK_API void                     nk_input_glyph(struct nk_context*, const nk_glyph);
NK_API void                     nk_input_unicode(struct nk_context*, nk_rune);
NK_API void                     nk_input_end(struct nk_context*);

/* Style */
NK_API void                     nk_style_default(struct nk_context*);
NK_API void                     nk_style_from_table(struct nk_context*, const struct nk_color*);
NK_API const char*              nk_style_color_name(enum nk_style_colors);
NK_API void                     nk_style_set_font(struct nk_context*, const struct nk_user_font*);

/* Utilities */
NK_API struct nk_rect           nk_widget_bounds(struct nk_context*);
NK_API struct nk_vec2           nk_widget_position(struct nk_context*);
NK_API struct nk_vec2           nk_widget_size(struct nk_context*);
NK_API int                      nk_widget_is_hovered(struct nk_context*);
NK_API int                      nk_widget_is_mouse_clicked(struct nk_context*, enum nk_buttons);
NK_API int                      nk_widget_has_mouse_click_down(struct nk_context*, enum nk_buttons, int down);
NK_API void                     nk_spacing(struct nk_context*, int cols);

/* base widget function  */
NK_API enum nk_widget_layout_states nk_widget(struct nk_rect*, const struct nk_context*);
NK_API enum nk_widget_layout_states nk_widget_fitting(struct nk_rect*, struct nk_context*, struct nk_vec2);

/* color (conversion user --> nuklear) */
NK_API struct nk_color          nk_rgb(int r, int g, int b);
NK_API struct nk_color          nk_rgb_iv(const int *rgb);
NK_API struct nk_color          nk_rgb_bv(const nk_byte* rgb);
NK_API struct nk_color          nk_rgb_f(float r, float g, float b);
NK_API struct nk_color          nk_rgb_fv(const float *rgb);
NK_API struct nk_color          nk_rgb_hex(const char *rgb);

NK_API struct nk_color          nk_rgba(int r, int g, int b, int a);
NK_API struct nk_color          nk_rgba_u32(nk_uint);
NK_API struct nk_color          nk_rgba_iv(const int *rgba);
NK_API struct nk_color          nk_rgba_bv(const nk_byte *rgba);
NK_API struct nk_color          nk_rgba_f(float r, float g, float b, float a);
NK_API struct nk_color          nk_rgba_fv(const float *rgba);
NK_API struct nk_color          nk_rgba_hex(const char *rgb);

NK_API struct nk_color          nk_hsv(int h, int s, int v);
NK_API struct nk_color          nk_hsv_iv(const int *hsv);
NK_API struct nk_color          nk_hsv_bv(const nk_byte *hsv);
NK_API struct nk_color          nk_hsv_f(float h, float s, float v);
NK_API struct nk_color          nk_hsv_fv(const float *hsv);

NK_API struct nk_color          nk_hsva(int h, int s, int v, int a);
NK_API struct nk_color          nk_hsva_iv(const int *hsva);
NK_API struct nk_color          nk_hsva_bv(const nk_byte *hsva);
NK_API struct nk_color          nk_hsva_f(float h, float s, float v, float a);
NK_API struct nk_color          nk_hsva_fv(const float *hsva);

/* color (conversion nuklear --> user) */
NK_API void                     nk_color_f(float *r, float *g, float *b, float *a, struct nk_color);
NK_API void                     nk_color_fv(float *rgba_out, struct nk_color);
NK_API nk_uint                  nk_color_u32(struct nk_color);
NK_API void                     nk_color_hex_rgba(char *output, struct nk_color);
NK_API void                     nk_color_hex_rgb(char *output, struct nk_color);

NK_API void                     nk_color_hsv_i(int *out_h, int *out_s, int *out_v, struct nk_color);
NK_API void                     nk_color_hsv_b(nk_byte *out_h, nk_byte *out_s, nk_byte *out_v, struct nk_color);
NK_API void                     nk_color_hsv_iv(int *hsv_out, struct nk_color);
NK_API void                     nk_color_hsv_bv(nk_byte *hsv_out, struct nk_color);
NK_API void                     nk_color_hsv_f(float *out_h, float *out_s, float *out_v, struct nk_color);
NK_API void                     nk_color_hsv_fv(float *hsv_out, struct nk_color);

NK_API void                     nk_color_hsva_i(int *h, int *s, int *v, int *a, struct nk_color);
NK_API void                     nk_color_hsva_b(nk_byte *h, nk_byte *s, nk_byte *v, nk_byte *a, struct nk_color);
NK_API void                     nk_color_hsva_iv(int *hsva_out, struct nk_color);
NK_API void                     nk_color_hsva_bv(nk_byte *hsva_out, struct nk_color);
NK_API void                     nk_color_hsva_f(float *out_h, float *out_s, float *out_v, float *out_a, struct nk_color);
NK_API void                     nk_color_hsva_fv(float *hsva_out, struct nk_color);

/* image */
NK_API nk_handle                nk_handle_ptr(void*);
NK_API nk_handle                nk_handle_id(int);
NK_API struct nk_image          nk_image_ptr(void*);
NK_API struct nk_image          nk_image_id(int);
NK_API int                      nk_image_is_subimage(const struct nk_image* img);
NK_API struct nk_image          nk_subimage_ptr(void*, unsigned short w, unsigned short h, struct nk_rect sub_region);
NK_API struct nk_image          nk_subimage_id(int, unsigned short w, unsigned short h, struct nk_rect sub_region);

/* math */
NK_API nk_hash                  nk_murmur_hash(const void *key, int len, nk_hash seed);
NK_API void                     nk_triangle_from_direction(struct nk_vec2 *result, struct nk_rect r, float pad_x, float pad_y, enum nk_heading);

NK_API struct nk_vec2           nk_vec2(float x, float y);
NK_API struct nk_vec2           nk_vec2i(int x, int y);
NK_API struct nk_vec2           nk_vec2v(const float *xy);
NK_API struct nk_vec2           nk_vec2iv(const int *xy);

NK_API struct nk_rect           nk_get_null_rect(void);
NK_API struct nk_rect           nk_rect(float x, float y, float w, float h);
NK_API struct nk_rect           nk_recti(int x, int y, int w, int h);
NK_API struct nk_rect           nk_recta(struct nk_vec2 pos, struct nk_vec2 size);
NK_API struct nk_rect           nk_rectv(const float *xywh);
NK_API struct nk_rect           nk_rectiv(const int *xywh);

/* string*/
NK_API int                      nk_strlen(const char *str);
NK_API int                      nk_stricmp(const char *s1, const char *s2);
NK_API int                      nk_stricmpn(const char *s1, const char *s2, int n);
NK_API int                      nk_strtof(float *number, const char *buffer);
NK_API int                      nk_strfilter(const char *text, const char *regexp);
NK_API int                      nk_strmatch_fuzzy_string(char const *str, char const *pattern, int *out_score);
NK_API int                      nk_strmatch_fuzzy_text(const char *txt, int txt_len, const char *pattern, int *out_score);
#ifdef NK_INCLUDE_STANDARD_IO
NK_API int                      nk_strfmt(char *buf, int len, const char *fmt,...);
#endif

/* UTF-8 */
NK_API int                      nk_utf_decode(const char*, nk_rune*, int);
NK_API int                      nk_utf_encode(nk_rune, char*, int);
NK_API int                      nk_utf_len(const char*, int byte_len);
NK_API const char*              nk_utf_at(const char *buffer, int length, int index, nk_rune *unicode, int *len);

/* ==============================================================
 *
 *                          MEMORY BUFFER
 *
 * ===============================================================*/

/*  A basic (double)-buffer with linear allocation and resetting as only
    freeing policy. The buffers main purpose is to control all memory management
    inside the GUI toolkit and still leave memory control as much as possible in
    the hand of the user while also making sure the library is easy to use if
    not as much control is needed.
    In general all memory inside this library can be provided from the user in
    three different ways.

    The first way and the one providing most control is by just passing a fixed
    size memory block. In this case all control lies in the hand of the user
    since he can exactly control where the memory comes from and how much memory
    the library should consume. Of course using the fixed size API removes the
    ability to automatically resize a buffer if not enough memory is provided so
    you have to take over the resizing. While being a fixed sized buffer sounds
    quite limiting, it is very effective in this library since the actual memory
    consumption is quite stable and has a fixed upper bound for a lot of cases.

    If you don't want to think about how much memory the library should allocate
    at all time or have a very dynamic UI with unpredictable memory consumption
    habits but still want control over memory allocation you can use the dynamic
    allocator based API. The allocator consists of two callbacks for allocating
    and freeing memory and optional userdata so you can plugin your own allocator.

    The final and easiest way can be used by defining
    NK_INCLUDE_DEFAULT_ALLOCATOR which uses the standard library memory
    allocation functions malloc and free and takes over complete control over
    memory in this library.
*/

struct nk_memory_status {
    void *memory;
    unsigned int type;
    nk_size size;
    nk_size allocated;
    nk_size needed;
    nk_size calls;
};

enum nk_allocation_type {
    NK_BUFFER_FIXED,
    NK_BUFFER_DYNAMIC
};

enum nk_buffer_allocation_type {
    NK_BUFFER_FRONT,
    NK_BUFFER_BACK,
    NK_BUFFER_MAX
};

struct nk_buffer_marker {
    int active;
    nk_size offset;
};

struct nk_memory {void *ptr;nk_size size;};
struct nk_buffer {
    struct nk_buffer_marker marker[NK_BUFFER_MAX];
    /* buffer marker to free a buffer to a certain offset */
    struct nk_allocator pool;
    /* allocator callback for dynamic buffers */
    enum nk_allocation_type type;
    /* memory management type */
    struct nk_memory memory;
    /* memory and size of the current memory block */
    float grow_factor;
    /* growing factor for dynamic memory management */
    nk_size allocated;
    /* total amount of memory allocated */
    nk_size needed;
    /* totally consumed memory given that enough memory is present */
    nk_size calls;
    /* number of allocation calls */
    nk_size size;
    /* current size of the buffer */
};

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void nk_buffer_init_default(struct nk_buffer*);
#endif
NK_API void nk_buffer_init(struct nk_buffer*, const struct nk_allocator*, nk_size size);
NK_API void nk_buffer_init_fixed(struct nk_buffer*, void *memory, nk_size size);
NK_API void nk_buffer_info(struct nk_memory_status*, struct nk_buffer*);
NK_API void nk_buffer_push(struct nk_buffer*, enum nk_buffer_allocation_type type,
                            void *memory, nk_size size, nk_size align);
NK_API void nk_buffer_mark(struct nk_buffer*, enum nk_buffer_allocation_type type);
NK_API void nk_buffer_reset(struct nk_buffer*, enum nk_buffer_allocation_type type);
NK_API void nk_buffer_clear(struct nk_buffer*);
NK_API void nk_buffer_free(struct nk_buffer*);
NK_API void *nk_buffer_memory(struct nk_buffer*);
NK_API const void *nk_buffer_memory_const(const struct nk_buffer*);
NK_API nk_size nk_buffer_total(struct nk_buffer*);

/* ==============================================================
 *
 *                          STRING
 *
 * ===============================================================*/

/*  Basic string buffer which is only used in context with the text editor
 *  to manage and manipulate dynamic or fixed size string content. This is _NOT_
 *  the default string handling method.*/

struct nk_str {
    struct nk_buffer buffer;
    int len; /* in codepoints/runes/glyphs */
};

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void nk_str_init_default(struct nk_str*);
#endif
NK_API void nk_str_init(struct nk_str*, const struct nk_allocator*, nk_size size);
NK_API void nk_str_init_fixed(struct nk_str*, void *memory, nk_size size);
NK_API void nk_str_clear(struct nk_str*);
NK_API void nk_str_free(struct nk_str*);

NK_API int nk_str_append_text_char(struct nk_str*, const char*, int);
NK_API int nk_str_append_str_char(struct nk_str*, const char*);
NK_API int nk_str_append_text_utf8(struct nk_str*, const char*, int);
NK_API int nk_str_append_str_utf8(struct nk_str*, const char*);
NK_API int nk_str_append_text_runes(struct nk_str*, const nk_rune*, int);
NK_API int nk_str_append_str_runes(struct nk_str*, const nk_rune*);

NK_API int nk_str_insert_at_char(struct nk_str*, int pos, const char*, int);
NK_API int nk_str_insert_at_rune(struct nk_str*, int pos, const char*, int);

NK_API int nk_str_insert_text_char(struct nk_str*, int pos, const char*, int);
NK_API int nk_str_insert_str_char(struct nk_str*, int pos, const char*);
NK_API int nk_str_insert_text_utf8(struct nk_str*, int pos, const char*, int);
NK_API int nk_str_insert_str_utf8(struct nk_str*, int pos, const char*);
NK_API int nk_str_insert_text_runes(struct nk_str*, int pos, const nk_rune*, int);
NK_API int nk_str_insert_str_runes(struct nk_str*, int pos, const nk_rune*);

NK_API void nk_str_remove_chars(struct nk_str*, int len);
NK_API void nk_str_remove_runes(struct nk_str *str, int len);
NK_API void nk_str_delete_chars(struct nk_str*, int pos, int len);
NK_API void nk_str_delete_runes(struct nk_str*, int pos, int len);

NK_API char *nk_str_at_char(struct nk_str*, int pos);
NK_API char *nk_str_at_rune(struct nk_str*, int pos, nk_rune *unicode, int *len);
NK_API nk_rune nk_str_rune_at(const struct nk_str*, int pos);
NK_API const char *nk_str_at_char_const(const struct nk_str*, int pos);
NK_API const char *nk_str_at_const(const struct nk_str*, int pos, nk_rune *unicode, int *len);

NK_API char *nk_str_get(struct nk_str*);
NK_API const char *nk_str_get_const(const struct nk_str*);
NK_API int nk_str_len(struct nk_str*);
NK_API int nk_str_len_char(struct nk_str*);

/*===============================================================
 *
 *                      TEXT EDITOR
 *
 * ===============================================================*/

/* Editing text in this library is handled by either `nk_edit_string` or
 * `nk_edit_buffer`. But like almost everything in this library there are multiple
 * ways of doing it and a balance between control and ease of use with memory
 * as well as functionality controlled by flags.
 *
 * This library generally allows three different levels of memory control:
 * First of is the most basic way of just providing a simple char array with
 * string length. This method is probably the easiest way of handling simple
 * user text input. Main upside is complete control over memory while the biggest
 * downside in comparsion with the other two approaches is missing undo/redo.
 *
 * For UIs that require undo/redo the second way was created. It is based on
 * a fixed size nk_text_edit struct, which has an internal undo/redo stack.
 * This is mainly useful if you want something more like a text editor but don't want
 * to have a dynamically growing buffer.
 *
 * The final ways is using a dynamically growing nk_text_edit struct, which
 * has both a default version if you don't care were memory comes from and a
 * allocator version if you do. While the text editor is quite powerful for its
 * complexity I would not recommend editing gigabytes of data with it.
 * It is rather designed for uses cases which make sense for a GUI library not for
 * an full blown text editor.
 */

#ifndef NK_TEXTEDIT_UNDOSTATECOUNT
#define NK_TEXTEDIT_UNDOSTATECOUNT     99
#endif

#ifndef NK_TEXTEDIT_UNDOCHARCOUNT
#define NK_TEXTEDIT_UNDOCHARCOUNT      999
#endif

struct nk_text_edit;
struct nk_clipboard {
    nk_handle userdata;
    nk_paste_f paste;
    nk_copy_f copy;
};

struct nk_text_undo_record {
   int where;
   short insert_length;
   short delete_length;
   short char_storage;
};

struct nk_text_undo_state {
   struct nk_text_undo_record undo_rec[NK_TEXTEDIT_UNDOSTATECOUNT];
   nk_rune undo_char[NK_TEXTEDIT_UNDOCHARCOUNT];
   short undo_point;
   short redo_point;
   short undo_char_point;
   short redo_char_point;
};

enum nk_text_edit_type {
    NK_TEXT_EDIT_SINGLE_LINE,
    NK_TEXT_EDIT_MULTI_LINE
};

struct nk_text_edit {
    struct nk_clipboard clip;
    struct nk_str string;
    nk_filter filter;
    struct nk_vec2 scrollbar;

    int cursor;
    int select_start;
    int select_end;
    unsigned char insert_mode;
    unsigned char cursor_at_end_of_line;
    unsigned char initialized;
    unsigned char has_preferred_x;
    unsigned char single_line;
    unsigned char active;
    unsigned char padding1;
    float preferred_x;
    struct nk_text_undo_state undo;
};

/* filter function */
NK_API int nk_filter_default(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_ascii(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_float(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_decimal(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_hex(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_oct(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_binary(const struct nk_text_edit*, nk_rune unicode);

/* text editor */
#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void nk_textedit_init_default(struct nk_text_edit*);
#endif
NK_API void nk_textedit_init(struct nk_text_edit*, struct nk_allocator*, nk_size size);
NK_API void nk_textedit_init_fixed(struct nk_text_edit*, void *memory, nk_size size);
NK_API void nk_textedit_free(struct nk_text_edit*);
NK_API void nk_textedit_text(struct nk_text_edit*, const char*, int total_len);
NK_API void nk_textedit_delete(struct nk_text_edit*, int where, int len);
NK_API void nk_textedit_delete_selection(struct nk_text_edit*);
NK_API void nk_textedit_select_all(struct nk_text_edit*);
NK_API int nk_textedit_cut(struct nk_text_edit*);
NK_API int nk_textedit_paste(struct nk_text_edit*, char const*, int len);
NK_API void nk_textedit_undo(struct nk_text_edit*);
NK_API void nk_textedit_redo(struct nk_text_edit*);

/* ===============================================================
 *
 *                          FONT
 *
 * ===============================================================*/

/*  Font handling in this library was designed to be quite customizable and lets
    you decide what you want to use and what you want to provide. In this sense
    there are four different degrees between control and ease of use and two
    different drawing APIs to provide for.

    So first of the easiest way to do font handling is by just providing a
    `nk_user_font` struct which only requires the height in pixel of the used
    font and a callback to calculate the width of a string. This way of handling
    fonts is best fitted for using the normal draw shape command API were you
    do all the text drawing yourself and the library does not require any kind
    of deeper knowledge about which font handling mechanism you use.

    While the first approach works fine if you don't want to use the optional
    vertex buffer output it is not enough if you do. To get font handling working
    for these cases you have to provide two additional parameter inside the
    `nk_user_font`. First a texture atlas handle used to draw text as subimages
    of a bigger font atlas texture and a callback to query a characters glyph
    information (offset, size, ...). So it is still possible to provide your own
    font and use the vertex buffer output.

    The final approach if you do not have a font handling functionality or don't
    want to use it in this library is by using the optional font baker. This API
    is divided into a high- and low-level API with different priorities between
    ease of use and control. Both API's can be used to create a font and
    font atlas texture and can even be used with or without the vertex buffer
    output. So it still uses the `nk_user_font` struct and the two different
    approaches previously stated still work.
    Now to the difference between the low level API and the high level API. The low
    level API provides a lot of control over the baking process of the font and
    provides total control over memory. It consists of a number of functions that
    need to be called from begin to end and each step requires some additional
    configuration, so it is a lot more complex than the high-level API.
    If you don't want to do all the work required for using the low-level API
    you can use the font atlas API. It provides the same functionality as the
    low-level API but takes away some configuration and all of memory control and
    in term provides a easier to use API.
*/

struct nk_user_font_glyph;
typedef float(*nk_text_width_f)(nk_handle, float h, const char*, int len);
typedef void(*nk_query_font_glyph_f)(nk_handle handle, float font_height,
                                    struct nk_user_font_glyph *glyph,
                                    nk_rune codepoint, nk_rune next_codepoint);

#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
struct nk_user_font_glyph {
    struct nk_vec2 uv[2];
    /* texture coordinates */
    struct nk_vec2 offset;
    /* offset between top left and glyph */
    float width, height;
    /* size of the glyph  */
    float xadvance;
    /* offset to the next glyph */
};
#endif

struct nk_user_font {
    nk_handle userdata;
    /* user provided font handle */
    float height;
    /* max height of the font */
    nk_text_width_f width;
    /* font string width in pixel callback */
#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
    nk_query_font_glyph_f query;
    /* font glyph callback to query drawing info */
    nk_handle texture;
    /* texture handle to the used font atlas or texture */
#endif
};

#ifdef NK_INCLUDE_FONT_BAKING
enum nk_font_coord_type {
    NK_COORD_UV,
    /* texture coordinates inside font glyphs are clamped between 0-1 */
    NK_COORD_PIXEL
    /* texture coordinates inside font glyphs are in absolute pixel */
};

struct nk_baked_font {
    float height;
    /* height of the font  */
    float ascent, descent;
    /* font glyphs ascent and descent  */
    nk_rune glyph_offset;
    /* glyph array offset inside the font glyph baking output array  */
    nk_rune glyph_count;
    /* number of glyphs of this font inside the glyph baking array output */
    const nk_rune *ranges;
    /* font codepoint ranges as pairs of (from/to) and 0 as last element */
};

struct nk_font_config {
    void *ttf_blob;
    /* pointer to loaded TTF file memory block.
     * NOTE: not needed for nk_font_atlas_add_from_memory and nk_font_atlas_add_from_file. */

    nk_size ttf_size;
    /* size of the loaded TTF file memory block
     * NOTE: not needed for nk_font_atlas_add_from_memory and nk_font_atlas_add_from_file. */


    unsigned char ttf_data_owned_by_atlas;
    /* used inside font atlas: default to: 0*/
    unsigned char merge_mode;
    /* merges this font into the last font */
    unsigned char pixel_snap;
    /* align very character to pixel boundary (if true set oversample (1,1)) */
    unsigned char oversample_v, oversample_h;
    /* rasterize at hight quality for sub-pixel position */
    unsigned char padding[3];

    float size;
    /* baked pixel height of the font */
    enum nk_font_coord_type coord_type;
    /* texture coordinate format with either pixel or UV coordinates */
    struct nk_vec2 spacing;
    /* extra pixel spacing between glyphs  */
    const nk_rune *range;
    /* list of unicode ranges (2 values per range, zero terminated) */
    struct nk_baked_font *font;
    /* font to setup in the baking process: NOTE: not needed for font atlas */
    nk_rune fallback_glyph;
    /* fallback glyph to use if a given rune is not found */
};

struct nk_font_glyph {
    nk_rune codepoint;
    float xadvance;
    float x0, y0, x1, y1, w, h;
    float u0, v0, u1, v1;
};

struct nk_font {
    struct nk_user_font handle;
    struct nk_baked_font info;
    float scale;
    struct nk_font_glyph *glyphs;
    const struct nk_font_glyph *fallback;
    nk_rune fallback_codepoint;
    nk_handle texture;
    int config;
};

enum nk_font_atlas_format {
    NK_FONT_ATLAS_ALPHA8,
    NK_FONT_ATLAS_RGBA32
};

struct nk_font_atlas {
    void *pixel;
    int tex_width;
    int tex_height;
    struct nk_allocator alloc;
    struct nk_recti custom;

    int glyph_count;
    struct nk_font *default_font;
    struct nk_font_glyph *glyphs;
    struct nk_font **fonts;
    struct nk_font_config *config;
    int font_num, font_cap;
};

/* some language glyph codepoint ranges */
NK_API const nk_rune *nk_font_default_glyph_ranges(void);
NK_API const nk_rune *nk_font_chinese_glyph_ranges(void);
NK_API const nk_rune *nk_font_cyrillic_glyph_ranges(void);
NK_API const nk_rune *nk_font_korean_glyph_ranges(void);

/* Font Atlas
 * ---------------------------------------------------------------
 * This is the high level font baking and handling API to generate an image
 * out of font glyphs used to draw text onto the screen. This API takes away
 * some control over the baking process like fine grained memory control and
 * custom baking data but provides additional functionality and easier to
 * use and manage data structures and functions. */

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void nk_font_atlas_init_default(struct nk_font_atlas*);
#endif
NK_API void nk_font_atlas_init(struct nk_font_atlas*, struct nk_allocator*);

NK_API void nk_font_atlas_begin(struct nk_font_atlas*);
NK_API struct nk_font_config nk_font_config(float pixel_height);
NK_API struct nk_font *nk_font_atlas_add(struct nk_font_atlas*, const struct nk_font_config*);
#ifdef NK_INCLUDE_DEFAULT_FONT
NK_API struct nk_font* nk_font_atlas_add_default(struct nk_font_atlas*, float height,
                                                const struct nk_font_config*);
#endif
NK_API struct nk_font* nk_font_atlas_add_from_memory(struct nk_font_atlas *atlas,
                                                    void *memory, nk_size size, float height,
                                                    const struct nk_font_config *config);
#ifdef NK_INCLUDE_STANDARD_IO
NK_API struct nk_font* nk_font_atlas_add_from_file(struct nk_font_atlas *atlas,
                                                const char *file_path, float height,
                                                const struct nk_font_config*);
#endif
NK_API struct nk_font *nk_font_atlas_add_compressed(struct nk_font_atlas*,
                                                void *memory, nk_size size, float height,
                                                const struct nk_font_config*);
NK_API struct nk_font* nk_font_atlas_add_compressed_base85(struct nk_font_atlas*,
                                                const char *data, float height,
                                                const struct nk_font_config *config);
NK_API const void* nk_font_atlas_bake(struct nk_font_atlas*, int *width, int *height,
                                enum nk_font_atlas_format);
NK_API void nk_font_atlas_end(struct nk_font_atlas*, nk_handle tex,
                                struct nk_draw_null_texture*);
NK_API void nk_font_atlas_clear(struct nk_font_atlas*);

/* Font
 * -----------------------------------------------------------------
 * The font structure is just a simple container to hold the output of a baking
 * process in the low level API. */

NK_API void nk_font_init(struct nk_font*, float pixel_height, nk_rune fallback_codepoint,
                    struct nk_font_glyph*, const struct nk_baked_font*,
                    nk_handle atlas);
NK_API const struct nk_font_glyph* nk_font_find_glyph(struct nk_font*, nk_rune unicode);

/* Font baking (needs to be called sequentially top to bottom)
 * --------------------------------------------------------------------
 * This is a low level API to bake font glyphs into an image and is more
 * complex than the atlas API but provides more control over the baking
 * process with custom bake data and memory management. */

NK_API void nk_font_bake_memory(nk_size *temporary_memory, int *glyph_count,
                            struct nk_font_config*, int count);
NK_API int nk_font_bake_pack(nk_size *img_memory, int *img_width, int *img_height,
                            struct nk_recti *custom_space,
                            void *temporary_memory, nk_size temporary_size,
                            const struct nk_font_config*, int font_count,
                            struct nk_allocator *alloc);
NK_API void nk_font_bake(void *image_memory, int image_width, int image_height,
                        void *temporary_memory, nk_size temporary_memory_size,
                        struct nk_font_glyph*, int glyphs_count,
                        const struct nk_font_config*, int font_count);
NK_API void nk_font_bake_custom_data(void *img_memory, int img_width, int img_height,
                                struct nk_recti img_dst, const char *image_data_mask,
                                int tex_width, int tex_height,char white,char black);
NK_API void nk_font_bake_convert(void *out_memory, int image_width, int image_height,
                                const void *in_memory);

#endif

/* ===============================================================
 *
 *                          DRAWING
 *
 * ===============================================================*/

/*  This library was designed to be render backend agnostic so it does
    not draw anything to screen. Instead all drawn shapes, widgets
    are made of, are buffered into memory and make up a command queue.
    Each frame therefore fills the command buffer with draw commands
    that then need to be executed by the user and his own render backend.
    After that the command buffer needs to be cleared and a new frame can be
    started. It is probably important to note that the command buffer is the main
    drawing API and the optional vertex buffer API only takes this format and
    converts it into a hardware accessible format.

    Draw commands are divided into filled shapes and shape outlines but only
    filled shapes as well as line, curves and scissor are required to be provided.
    All other shape drawing commands can be used but are not required. This was
    done to allow the maximum number of render backends to be able to use this
    library without you having to do additional work.
*/

enum nk_command_type {
    NK_COMMAND_NOP,
    NK_COMMAND_SCISSOR,
    NK_COMMAND_LINE,
    NK_COMMAND_CURVE,
    NK_COMMAND_RECT,
    NK_COMMAND_RECT_FILLED,
    NK_COMMAND_RECT_MULTI_COLOR,
    NK_COMMAND_CIRCLE,
    NK_COMMAND_CIRCLE_FILLED,
    NK_COMMAND_ARC,
    NK_COMMAND_ARC_FILLED,
    NK_COMMAND_TRIANGLE,
    NK_COMMAND_TRIANGLE_FILLED,
    NK_COMMAND_POLYGON,
    NK_COMMAND_POLYGON_FILLED,
    NK_COMMAND_POLYLINE,
    NK_COMMAND_TEXT,
    NK_COMMAND_IMAGE
};

/* command base and header of every command inside the buffer */
struct nk_command {
    enum nk_command_type type;
    nk_size next;
#ifdef NK_INCLUDE_COMMAND_USERDATA
    nk_handle userdata;
#endif
};

struct nk_command_scissor {
    struct nk_command header;
    short x, y;
    unsigned short w, h;
};

struct nk_command_line {
    struct nk_command header;
    unsigned short line_thickness;
    struct nk_vec2i begin;
    struct nk_vec2i end;
    struct nk_color color;
};

struct nk_command_curve {
    struct nk_command header;
    unsigned short line_thickness;
    struct nk_vec2i begin;
    struct nk_vec2i end;
    struct nk_vec2i ctrl[2];
    struct nk_color color;
};

struct nk_command_rect {
    struct nk_command header;
    unsigned short rounding;
    unsigned short line_thickness;
    short x, y;
    unsigned short w, h;
    struct nk_color color;
};

struct nk_command_rect_filled {
    struct nk_command header;
    unsigned short rounding;
    short x, y;
    unsigned short w, h;
    struct nk_color color;
};

struct nk_command_rect_multi_color {
    struct nk_command header;
    short x, y;
    unsigned short w, h;
    struct nk_color left;
    struct nk_color top;
    struct nk_color bottom;
    struct nk_color right;
};

struct nk_command_triangle {
    struct nk_command header;
    unsigned short line_thickness;
    struct nk_vec2i a;
    struct nk_vec2i b;
    struct nk_vec2i c;
    struct nk_color color;
};

struct nk_command_triangle_filled {
    struct nk_command header;
    struct nk_vec2i a;
    struct nk_vec2i b;
    struct nk_vec2i c;
    struct nk_color color;
};

struct nk_command_circle {
    struct nk_command header;
    short x, y;
    unsigned short line_thickness;
    unsigned short w, h;
    struct nk_color color;
};

struct nk_command_circle_filled {
    struct nk_command header;
    short x, y;
    unsigned short w, h;
    struct nk_color color;
};

struct nk_command_arc {
    struct nk_command header;
    short cx, cy;
    unsigned short r;
    unsigned short line_thickness;
    float a[2];
    struct nk_color color;
};

struct nk_command_arc_filled {
    struct nk_command header;
    short cx, cy;
    unsigned short r;
    float a[2];
    struct nk_color color;
};

struct nk_command_polygon {
    struct nk_command header;
    struct nk_color color;
    unsigned short line_thickness;
    unsigned short point_count;
    struct nk_vec2i points[1];
};

struct nk_command_polygon_filled {
    struct nk_command header;
    struct nk_color color;
    unsigned short point_count;
    struct nk_vec2i points[1];
};

struct nk_command_polyline {
    struct nk_command header;
    struct nk_color color;
    unsigned short line_thickness;
    unsigned short point_count;
    struct nk_vec2i points[1];
};

struct nk_command_image {
    struct nk_command header;
    short x, y;
    unsigned short w, h;
    struct nk_image img;
};

struct nk_command_text {
    struct nk_command header;
    const struct nk_user_font *font;
    struct nk_color background;
    struct nk_color foreground;
    short x, y;
    unsigned short w, h;
    float height;
    int length;
    char string[1];
};

enum nk_command_clipping {
    NK_CLIPPING_OFF = nk_false,
    NK_CLIPPING_ON = nk_true
};

struct nk_command_buffer {
    struct nk_buffer *base;
    struct nk_rect clip;
    int use_clipping;
    nk_handle userdata;
    nk_size begin, end, last;
};

/* shape outlines */
NK_API void nk_stroke_line(struct nk_command_buffer *b, float x0, float y0,
                        float x1, float y1, float line_thickness, struct nk_color);
NK_API void nk_stroke_curve(struct nk_command_buffer*, float, float, float, float,
                        float, float, float, float, float line_thickness, struct nk_color);
NK_API void nk_stroke_rect(struct nk_command_buffer*, struct nk_rect, float rounding,
                        float line_thickness, struct nk_color);
NK_API void nk_stroke_circle(struct nk_command_buffer*, struct nk_rect,
                            float line_thickness, struct nk_color);
NK_API void nk_stroke_arc(struct nk_command_buffer*, float cx, float cy, float radius,
                        float a_min, float a_max, float line_thickness, struct nk_color);
NK_API void nk_stroke_triangle(struct nk_command_buffer*, float, float,
                                float, float, float, float, float line_thichness,
                                struct nk_color);
NK_API void nk_stroke_polyline(struct nk_command_buffer*, float *points, int point_count,
                                float line_thickness, struct nk_color col);
NK_API void nk_stroke_polygon(struct nk_command_buffer*, float*, int point_count,
                                float line_thickness, struct nk_color);

/* filled shades */
NK_API void nk_fill_rect(struct nk_command_buffer*, struct nk_rect, float rounding,
                        struct nk_color);
NK_API void nk_fill_rect_multi_color(struct nk_command_buffer*, struct nk_rect,
                                struct nk_color left, struct nk_color top,
                                struct nk_color right, struct nk_color bottom);
NK_API void nk_fill_circle(struct nk_command_buffer*, struct nk_rect, struct nk_color);
NK_API void nk_fill_arc(struct nk_command_buffer*, float cx, float cy, float radius,
                        float a_min, float a_max, struct nk_color);
NK_API void nk_fill_triangle(struct nk_command_buffer*, float x0, float y0,
                            float x1, float y1, float x2, float y2, struct nk_color);
NK_API void nk_fill_polygon(struct nk_command_buffer*, float*, int point_count,
                            struct nk_color);
/* misc */
NK_API void nk_push_scissor(struct nk_command_buffer*, struct nk_rect);
NK_API void nk_draw_image(struct nk_command_buffer*, struct nk_rect, const struct nk_image*);
NK_API void nk_draw_text(struct nk_command_buffer*, struct nk_rect,
                    const char *text, int len, const struct nk_user_font*,
                    struct nk_color, struct nk_color);

NK_API const struct nk_command* nk__next(struct nk_context*, const struct nk_command*);
NK_API const struct nk_command* nk__begin(struct nk_context*);

/* ===============================================================
 *
 *                          INPUT
 *
 * ===============================================================*/

struct nk_mouse_button {
    int down;
    unsigned int clicked;
    struct nk_vec2 clicked_pos;
};

struct nk_mouse {
    struct nk_mouse_button buttons[NK_BUTTON_MAX];
    struct nk_vec2 pos;
    struct nk_vec2 prev;
    struct nk_vec2 delta;
    float scroll_delta;
};

struct nk_key {
    int down;
    unsigned int clicked;
};

struct nk_keyboard {
    struct nk_key keys[NK_KEY_MAX];
    char text[NK_INPUT_MAX];
    int text_len;
};

struct nk_input {
    struct nk_keyboard keyboard;
    struct nk_mouse mouse;
};

NK_API int nk_input_has_mouse_click_in_rect(const struct nk_input*,
                                    enum nk_buttons, struct nk_rect);
NK_API int nk_input_has_mouse_click_down_in_rect(const struct nk_input*, enum nk_buttons,
                                        struct nk_rect, int down);
NK_API int nk_input_is_mouse_click_in_rect(const struct nk_input*,
                                    enum nk_buttons, struct nk_rect);
NK_API int nk_input_is_mouse_click_down_in_rect(const struct nk_input *i, enum nk_buttons id,
                                        struct nk_rect b, int down);
NK_API int nk_input_any_mouse_click_in_rect(const struct nk_input*, struct nk_rect);
NK_API int nk_input_is_mouse_prev_hovering_rect(const struct nk_input*, struct nk_rect);
NK_API int nk_input_is_mouse_hovering_rect(const struct nk_input*, struct nk_rect);
NK_API int nk_input_mouse_clicked(const struct nk_input*, enum nk_buttons, struct nk_rect);
NK_API int nk_input_is_mouse_down(const struct nk_input*, enum nk_buttons);
NK_API int nk_input_is_mouse_pressed(const struct nk_input*, enum nk_buttons);
NK_API int nk_input_is_mouse_released(const struct nk_input*, enum nk_buttons);
NK_API int nk_input_is_key_pressed(const struct nk_input*, enum nk_keys);
NK_API int nk_input_is_key_released(const struct nk_input*, enum nk_keys);
NK_API int nk_input_is_key_down(const struct nk_input*, enum nk_keys);


/* ===============================================================
 *
 *                          DRAW LIST
 *
 * ===============================================================*/

#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
/*  The optional vertex buffer draw list provides a 2D drawing context
    with antialiasing functionality which takes basic filled or outlined shapes
    or a path and outputs vertexes, elements and draw commands.
    The actual draw list API is not required to be used directly while using this
    library since converting the default library draw command output is done by
    just calling `nk_convert` but I decided to still make this library accessible
    since it can be useful.

    The draw list is based on a path buffering and polygon and polyline
    rendering API which allows a lot of ways to draw 2D content to screen.
    In fact it is probably more powerful than needed but allows even more crazy
    things than this library provides by default.
*/

typedef unsigned short nk_draw_index;
typedef nk_uint nk_draw_vertex_color;

enum nk_draw_list_stroke {
    NK_STROKE_OPEN = nk_false,
    /* build up path has no connection back to the beginning */
    NK_STROKE_CLOSED = nk_true
    /* build up path has a connection back to the beginning */
};

struct nk_draw_vertex {
    struct nk_vec2 position;
    struct nk_vec2 uv;
    nk_draw_vertex_color col;
};

struct nk_draw_command {
    unsigned int elem_count;
    /* number of elements in the current draw batch */
    struct nk_rect clip_rect;
    /* current screen clipping rectangle */
    nk_handle texture;
    /* current texture to set */
#ifdef NK_INCLUDE_COMMAND_USERDATA
    nk_handle userdata;
#endif
};

struct nk_draw_list {
    float global_alpha;
    enum nk_anti_aliasing shape_AA;
    enum nk_anti_aliasing line_AA;
    struct nk_draw_null_texture null;
    struct nk_rect clip_rect;
    struct nk_buffer *buffer;
    struct nk_buffer *vertices;
    struct nk_buffer *elements;
    unsigned int element_count;
    unsigned int vertex_count;
    nk_size cmd_offset;
    unsigned int cmd_count;
    unsigned int path_count;
    unsigned int path_offset;
    struct nk_vec2 circle_vtx[12];
#ifdef NK_INCLUDE_COMMAND_USERDATA
    nk_handle userdata;
#endif
};

/* draw list */
NK_API void nk_draw_list_init(struct nk_draw_list*);
NK_API void nk_draw_list_setup(struct nk_draw_list*, float global_alpha,
                    enum nk_anti_aliasing line_AA, enum nk_anti_aliasing shape_AA,
                    struct nk_draw_null_texture, struct nk_buffer *cmds,
                    struct nk_buffer *vertices, struct nk_buffer *elements);
NK_API void nk_draw_list_clear(struct nk_draw_list*);

/* drawing */
#define nk_draw_list_foreach(cmd, can, b)\
    for((cmd)=nk__draw_list_begin(can, b); (cmd)!=0; (cmd)=nk__draw_list_next(cmd, b, can))

NK_API const struct nk_draw_command* nk__draw_list_begin(const struct nk_draw_list*,
                                                        const struct nk_buffer*);
NK_API const struct nk_draw_command* nk__draw_list_next(const struct nk_draw_command*,
                                                const struct nk_buffer*,
                                                const struct nk_draw_list*);
NK_API const struct nk_draw_command* nk__draw_begin(const struct nk_context*,
                                                    const struct nk_buffer*);
NK_API const struct nk_draw_command* nk__draw_next(const struct nk_draw_command*,
                                                    const struct nk_buffer*,
                                                    const struct nk_context*);

/* path */
NK_API void nk_draw_list_path_clear(struct nk_draw_list*);
NK_API void nk_draw_list_path_line_to(struct nk_draw_list *list, struct nk_vec2 pos);
NK_API void nk_draw_list_path_arc_to_fast(struct nk_draw_list*, struct nk_vec2 center,
                                float radius, int a_min, int a_max);
NK_API void nk_draw_list_path_arc_to(struct nk_draw_list*, struct nk_vec2 center,
                            float radius, float a_min, float a_max,
                            unsigned int segments);
NK_API void nk_draw_list_path_rect_to(struct nk_draw_list*, struct nk_vec2 a,
                                struct nk_vec2 b, float rounding);
NK_API void nk_draw_list_path_curve_to(struct nk_draw_list*, struct nk_vec2 p2,
                            struct nk_vec2 p3, struct nk_vec2 p4,
                            unsigned int num_segments);
NK_API void nk_draw_list_path_fill(struct nk_draw_list*, struct nk_color);
NK_API void nk_draw_list_path_stroke(struct nk_draw_list*, struct nk_color,
                            enum nk_draw_list_stroke closed, float thickness);
/* stroke */
NK_API void nk_draw_list_stroke_line(struct nk_draw_list*, struct nk_vec2 a, struct nk_vec2 b,
                            struct nk_color, float thickness);
NK_API void nk_draw_list_stroke_rect(struct nk_draw_list*, struct nk_rect rect, struct nk_color,
                            float rounding, float thickness);
NK_API void nk_draw_list_stroke_triangle(struct nk_draw_list*, struct nk_vec2 a, struct nk_vec2 b,
                                struct nk_vec2 c, struct nk_color, float thickness);
NK_API void nk_draw_list_stroke_circle(struct nk_draw_list*, struct nk_vec2 center, float radius,
                            struct nk_color, unsigned int segs, float thickness);
NK_API void nk_draw_list_stroke_curve(struct nk_draw_list*, struct nk_vec2 p0, struct nk_vec2 cp0,
                            struct nk_vec2 cp1, struct nk_vec2 p1, struct nk_color,
                            unsigned int segments, float thickness);
NK_API void nk_draw_list_stroke_poly_line(struct nk_draw_list*, const struct nk_vec2 *points,
                                const unsigned int count, struct nk_color,
                                enum nk_draw_list_stroke closed, float thickness,
                                enum nk_anti_aliasing aliasing);
/* fill */
NK_API void nk_draw_list_fill_rect(struct nk_draw_list*, struct nk_rect rect,
                                    struct nk_color, float rounding);
NK_API void nk_draw_list_fill_rect_multi_color(struct nk_draw_list *list,
                                            struct nk_rect rect, struct nk_color left,
                                            struct nk_color top, struct nk_color right,
                                            struct nk_color bottom);
NK_API void nk_draw_list_fill_triangle(struct nk_draw_list*, struct nk_vec2 a,
                                    struct nk_vec2 b, struct nk_vec2 c, struct nk_color);
NK_API void nk_draw_list_fill_circle(struct nk_draw_list*, struct nk_vec2 center,
                                float radius, struct nk_color col, unsigned int segs);
NK_API void nk_draw_list_fill_poly_convex(struct nk_draw_list*, const struct nk_vec2 *points,
                                        const unsigned int count, struct nk_color,
                                        enum nk_anti_aliasing aliasing);
/* misc */
NK_API void nk_draw_list_add_image(struct nk_draw_list*, struct nk_image texture,
                            struct nk_rect rect, struct nk_color);
NK_API void nk_draw_list_add_text(struct nk_draw_list*, const struct nk_user_font*,
                                struct nk_rect, const char *text, int len,
                                float font_height, struct nk_color);
#ifdef NK_INCLUDE_COMMAND_USERDATA
NK_API void nk_draw_list_push_userdata(struct nk_draw_list*, nk_handle userdata);
#endif

#endif

/* ===============================================================
 *
 *                          GUI
 *
 * ===============================================================*/

enum nk_style_item_type {
    NK_STYLE_ITEM_COLOR,
    NK_STYLE_ITEM_IMAGE
};

union nk_style_item_data {
    struct nk_image image;
    struct nk_color color;
};

struct nk_style_item {
    enum nk_style_item_type type;
    union nk_style_item_data data;
};

struct nk_style_text {
    struct nk_color color;
    struct nk_vec2 padding;
};

struct nk_style_button;
struct nk_style_custom_button_drawing {
    void(*button_text)(struct nk_command_buffer*,
        const struct nk_rect *background, const struct nk_rect*,
        nk_flags state, const struct nk_style_button*,
        const char*, int len, nk_flags text_alignment,
        const struct nk_user_font*);
    void(*button_symbol)(struct nk_command_buffer*,
        const struct nk_rect *background, const struct nk_rect*,
        nk_flags state, const struct nk_style_button*,
        enum nk_symbol_type, const struct nk_user_font*);
    void(*button_image)(struct nk_command_buffer*,
        const struct nk_rect *background, const struct nk_rect*,
        nk_flags state, const struct nk_style_button*,
        const struct nk_image *img);
    void(*button_text_symbol)(struct nk_command_buffer*,
        const struct nk_rect *background, const struct nk_rect*,
        const struct nk_rect *symbol, nk_flags state,
        const struct nk_style_button*,
        const char *text, int len, enum nk_symbol_type,
        const struct nk_user_font*);
    void(*button_text_image)(struct nk_command_buffer*,
        const struct nk_rect *background, const struct nk_rect*,
        const struct nk_rect *image, nk_flags state,
        const struct nk_style_button*,
        const char *text, int len, const struct nk_user_font*,
        const struct nk_image *img);
};

struct nk_style_button {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* text */
    struct nk_color text_background;
    struct nk_color text_normal;
    struct nk_color text_hover;
    struct nk_color text_active;
    nk_flags text_alignment;

    /* properties */
    float border;
    float rounding;
    struct nk_vec2 padding;
    struct nk_vec2 image_padding;
    struct nk_vec2 touch_padding;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle userdata);
    struct nk_style_custom_button_drawing draw;
    void(*draw_end)(struct nk_command_buffer*, nk_handle userdata);
};

struct nk_style_toggle;
union nk_style_custom_toggle_drawing {
    void(*radio)(struct nk_command_buffer*, nk_flags state,
        const struct nk_style_toggle *toggle, int active,
        const struct nk_rect *label, const struct nk_rect *selector,
        const struct nk_rect *cursor, const char *string, int len,
        const struct nk_user_font *font);
    void(*checkbox)(struct nk_command_buffer*, nk_flags state,
        const struct nk_style_toggle *toggle, int active,
        const struct nk_rect *label, const struct nk_rect *selector,
        const struct nk_rect *cursor, const char *string, int len,
        const struct nk_user_font *font);
};

struct nk_style_toggle {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;

    /* cursor */
    struct nk_style_item cursor_normal;
    struct nk_style_item cursor_hover;

    /* text */
    struct nk_color text_normal;
    struct nk_color text_hover;
    struct nk_color text_active;
    struct nk_color text_background;
    nk_flags text_alignment;

    /* properties */
    struct nk_vec2 padding;
    struct nk_vec2 touch_padding;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    union nk_style_custom_toggle_drawing draw;
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_selectable {
    /* background (inactive) */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item pressed;

    /* background (active) */
    struct nk_style_item normal_active;
    struct nk_style_item hover_active;
    struct nk_style_item pressed_active;

    /* text color (inactive) */
    struct nk_color text_normal;
    struct nk_color text_hover;
    struct nk_color text_pressed;

    /* text color (active) */
    struct nk_color text_normal_active;
    struct nk_color text_hover_active;
    struct nk_color text_pressed_active;
    struct nk_color text_background;
    nk_flags text_alignment;

    /* properties */
    float rounding;
    struct nk_vec2 padding;
    struct nk_vec2 touch_padding;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    void(*draw)(struct nk_command_buffer*,
        nk_flags state, const struct nk_style_selectable*, int active,
        const struct nk_rect*, const char *string, int len,
        nk_flags align, const struct nk_user_font*);
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_slider {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* background bar */
    struct nk_color bar_normal;
    struct nk_color bar_hover;
    struct nk_color bar_active;
    struct nk_color bar_filled;

    /* cursor */
    struct nk_style_item cursor_normal;
    struct nk_style_item cursor_hover;
    struct nk_style_item cursor_active;

    /* properties */
    float border;
    float rounding;
    float bar_height;
    struct nk_vec2 padding;
    struct nk_vec2 spacing;
    struct nk_vec2 cursor_size;

    /* optional buttons */
    int show_buttons;
    struct nk_style_button inc_button;
    struct nk_style_button dec_button;
    enum nk_symbol_type inc_symbol;
    enum nk_symbol_type dec_symbol;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    void(*draw)(struct nk_command_buffer*, nk_flags state,
        const struct nk_style_slider*, const struct nk_rect *bar,
        const struct nk_rect *cursor, float min, float value, float max);
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_progress {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;

    /* cursor */
    struct nk_style_item cursor_normal;
    struct nk_style_item cursor_hover;
    struct nk_style_item cursor_active;

    /* properties */
    float rounding;
    struct nk_vec2 padding;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    void(*draw)(struct nk_command_buffer*, nk_flags state,
        const struct nk_style_progress*, const struct nk_rect *bounds,
        const struct nk_rect *cursor, nk_size value, nk_size max);
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_scrollbar {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* cursor */
    struct nk_style_item cursor_normal;
    struct nk_style_item cursor_hover;
    struct nk_style_item cursor_active;

    /* properties */
    float border;
    float rounding;
    struct nk_vec2 padding;

    /* optional buttons */
    int show_buttons;
    struct nk_style_button inc_button;
    struct nk_style_button dec_button;
    enum nk_symbol_type inc_symbol;
    enum nk_symbol_type dec_symbol;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    void(*draw)(struct nk_command_buffer*, nk_flags state,
        const struct nk_style_scrollbar*, const struct nk_rect *scroll,
        const struct nk_rect *cursor);
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_edit {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;
    struct nk_style_scrollbar scrollbar;

    /* cursor  */
    struct nk_color cursor_normal;
    struct nk_color cursor_hover;
    struct nk_color cursor_text_normal;
    struct nk_color cursor_text_hover;

    /* text (unselected) */
    struct nk_color text_normal;
    struct nk_color text_hover;
    struct nk_color text_active;

    /* text (selected) */
    struct nk_color selected_normal;
    struct nk_color selected_hover;
    struct nk_color selected_text_normal;
    struct nk_color selected_text_hover;

    /* properties */
    float border;
    float rounding;
    float cursor_size;
    struct nk_vec2 scrollbar_size;
    struct nk_vec2 padding;
    float row_padding;
};

struct nk_style_property {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* text */
    struct nk_color label_normal;
    struct nk_color label_hover;
    struct nk_color label_active;

    /* symbols */
    enum nk_symbol_type sym_left;
    enum nk_symbol_type sym_right;

    /* properties */
    float border;
    float rounding;
    struct nk_vec2 padding;

    struct nk_style_edit edit;
    struct nk_style_button inc_button;
    struct nk_style_button dec_button;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    void(*draw)(struct nk_command_buffer*, const struct nk_style_property*,
        const struct nk_rect*, const struct nk_rect *label, nk_flags state,
        const char *name, int len, const struct nk_user_font*);
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_chart {
    /* colors */
    struct nk_style_item background;
    struct nk_color border_color;
    struct nk_color selected_color;
    struct nk_color color;

    /* properties */
    float border;
    float rounding;
    struct nk_vec2 padding;
};

struct nk_style_combo {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* label */
    struct nk_color label_normal;
    struct nk_color label_hover;
    struct nk_color label_active;

    /* symbol */
    struct nk_color symbol_normal;
    struct nk_color symbol_hover;
    struct nk_color symbol_active;

    /* button */
    struct nk_style_button button;
    enum nk_symbol_type sym_normal;
    enum nk_symbol_type sym_hover;
    enum nk_symbol_type sym_active;

    /* properties */
    float border;
    float rounding;
    struct nk_vec2 content_padding;
    struct nk_vec2 button_padding;
    struct nk_vec2 spacing;
};

struct nk_style_tab {
    /* background */
    struct nk_style_item background;
    struct nk_color border_color;
    struct nk_color text;

    /* button */
    struct nk_style_button tab_button;
    struct nk_style_button node_button;
    enum nk_symbol_type sym_minimize;
    enum nk_symbol_type sym_maximize;

    /* properties */
    float border;
    float rounding;
    struct nk_vec2 padding;
    struct nk_vec2 spacing;
};

enum nk_style_header_align {
    NK_HEADER_LEFT,
    NK_HEADER_RIGHT
};

struct nk_style_window_header {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;

    /* button */
    struct nk_style_button close_button;
    struct nk_style_button minimize_button;
    enum nk_symbol_type close_symbol;
    enum nk_symbol_type minimize_symbol;
    enum nk_symbol_type maximize_symbol;

    /* title */
    struct nk_color label_normal;
    struct nk_color label_hover;
    struct nk_color label_active;

    /* properties */
    enum nk_style_header_align align;
    struct nk_vec2 padding;
    struct nk_vec2 label_padding;
    struct nk_vec2 spacing;
};

struct nk_style_window {
    struct nk_style_window_header header;
    struct nk_style_item fixed_background;
    struct nk_color background;

    struct nk_color border_color;
    struct nk_color combo_border_color;
    struct nk_color contextual_border_color;
    struct nk_color menu_border_color;
    struct nk_color group_border_color;
    struct nk_color tooltip_border_color;

    struct nk_style_item scaler;
    struct nk_vec2 footer_padding;

    float border;
    float combo_border;
    float contextual_border;
    float menu_border;
    float group_border;
    float tooltip_border;

    float rounding;
    struct nk_vec2 scaler_size;
    struct nk_vec2 padding;
    struct nk_vec2 spacing;
    struct nk_vec2 scrollbar_size;
    struct nk_vec2 min_size;
};

struct nk_style {
    struct nk_user_font font;
    struct nk_style_text text;
    struct nk_style_button button;
    struct nk_style_button contextual_button;
    struct nk_style_button menu_button;
    struct nk_style_toggle option;
    struct nk_style_toggle checkbox;
    struct nk_style_selectable selectable;
    struct nk_style_slider slider;
    struct nk_style_progress progress;
    struct nk_style_property property;
    struct nk_style_edit edit;
    struct nk_style_chart line_chart;
    struct nk_style_chart column_chart;
    struct nk_style_scrollbar scrollh;
    struct nk_style_scrollbar scrollv;
    struct nk_style_tab tab;
    struct nk_style_combo combo;
    struct nk_style_window window;
};

NK_API struct nk_style_item nk_style_item_image(struct nk_image img);
NK_API struct nk_style_item nk_style_item_color(struct nk_color);
NK_API struct nk_style_item nk_style_item_hide(void);

/*==============================================================
 *                          PANEL
 * =============================================================*/

struct nk_chart {
    const struct nk_style_chart *style;
    enum nk_chart_type type;
    float x, y, w, h;
    float min, max, range;
    struct nk_vec2 last;
    int index;
    int count;
};

struct nk_row_layout {
    int type;
    int index;
    float height;
    int columns;
    const float *ratio;
    float item_width, item_height;
    float item_offset;
    float filled;
    struct nk_rect item;
    int tree_depth;
};

struct nk_popup_buffer {
    nk_size begin;
    nk_size parent;
    nk_size last;
    nk_size end;
    int active;
};

struct nk_menu_state {
    float x, y, w, h;
    struct nk_scroll offset;
};

struct nk_panel {
    nk_flags flags;
    struct nk_rect bounds;
    struct nk_scroll *offset;
    float at_x, at_y, max_x;
    float width, height;
    float footer_h;
    float header_h;
    float border;
    struct nk_rect clip;
    struct nk_menu_state menu;
    struct nk_row_layout row;
    struct nk_chart chart;
    struct nk_popup_buffer popup_buffer;
    struct nk_command_buffer *buffer;
    struct nk_panel *parent;
};

/*==============================================================
 *                          WINDOW
 * =============================================================*/

struct nk_table;

enum nk_window_flags {
    NK_WINDOW_PRIVATE       = NK_FLAG(9),
    /* dummy flag which mark the beginning of the private window flag part */
    NK_WINDOW_ROM           = NK_FLAG(10),
    /* sets the window into a read only mode and does not allow input changes */
    NK_WINDOW_HIDDEN        = NK_FLAG(11),
    /* Hides the window and stops any window interaction and drawing can be set
     * by user input or by closing the window */

    NK_WINDOW_MINIMIZED     = NK_FLAG(12),
    /* marks the window as minimized */
    NK_WINDOW_SUB           = NK_FLAG(13),
    /* Marks the window as subwindow of another window*/
    NK_WINDOW_GROUP         = NK_FLAG(14),
    /* Marks the window as window widget group */
    NK_WINDOW_POPUP         = NK_FLAG(15),
    /* Marks the window as a popup window */
    NK_WINDOW_NONBLOCK      = NK_FLAG(16),
    /* Marks the window as a nonblock popup window */
    NK_WINDOW_CONTEXTUAL    = NK_FLAG(17),
    /* Marks the window as a combo box or menu */
    NK_WINDOW_COMBO         = NK_FLAG(18),
    /* Marks the window as a combo box */
    NK_WINDOW_MENU          = NK_FLAG(19),
    /* Marks the window as a menu */
    NK_WINDOW_TOOLTIP       = NK_FLAG(20),
    /* Marks the window as a menu */
    NK_WINDOW_REMOVE_ROM    = NK_FLAG(21)
    /* Removes the read only mode at the end of the window */
};

struct nk_popup_state {
    struct nk_window *win;
    enum nk_window_flags type;
    nk_hash name;
    int active;
    unsigned combo_count;
    unsigned con_count, con_old;
    unsigned active_con;
};

struct nk_edit_state {
    nk_hash name;
    unsigned int seq;
    unsigned int old;
    int active, prev;
    int cursor;
    int sel_start;
    int sel_end;
    struct nk_scroll scrollbar;
    unsigned char insert_mode;
    unsigned char single_line;
};

struct nk_property_state {
    int active, prev;
    char buffer[NK_MAX_NUMBER_BUFFER];
    int length;
    int cursor;
    nk_hash name;
    unsigned int seq;
    unsigned int old;
    int state;
};

struct nk_window {
    nk_hash name;
    nk_flags flags;
    unsigned int seq;
    struct nk_rect bounds;
    struct nk_scroll scrollbar;
    struct nk_command_buffer buffer;
    struct nk_panel *layout;

    /* persistent widget state */
    struct nk_property_state property;
    struct nk_popup_state popup;
    struct nk_edit_state edit;

    struct nk_table *tables;
    unsigned short table_count;
    unsigned short table_size;

    /* window list hooks */
    struct nk_window *next;
    struct nk_window *prev;
    struct nk_window *parent;
};

/*==============================================================
 *                          CONTEXT
 * =============================================================*/

struct nk_context {
/* public: can be accessed freely */
    struct nk_input input;
    struct nk_style style;
    struct nk_buffer memory;
    struct nk_clipboard clip;
    nk_flags last_widget_state;

/* private:
    should only be accessed if you
    know what you are doing */

#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
    struct nk_draw_list draw_list;
#endif
#ifdef NK_INCLUDE_COMMAND_USERDATA
    nk_handle userdata;
#endif

    /* text editor objects are quite big because they have a internal
     * undo/redo stack. It therefore does not make sense to have one for
     * each window for temporary use cases, so I only provide *one* instance
     * for all windows. This works because the content is cleared anyway */

    struct nk_text_edit text_edit;

    /* windows */
    int build;
    void *pool;
    struct nk_window *begin;
    struct nk_window *end;
    struct nk_window *active;
    struct nk_window *current;
    struct nk_window *freelist;
    unsigned int count;
    unsigned int seq;
};

#ifdef __cplusplus
}
#endif
#endif /* NK_H_ */

/*
 * ==============================================================
 *
 *                          IMPLEMENTATION
 *
 * ===============================================================
 */

#ifdef NK_IMPLEMENTATION

#ifndef NK_POOL_DEFAULT_CAPACITY
#define NK_POOL_DEFAULT_CAPACITY 16
#endif

#ifndef NK_VALUE_PAGE_CAPACITY
#define NK_VALUE_PAGE_CAPACITY 32
#endif

#ifndef NK_DEFAULT_COMMAND_BUFFER_SIZE
#define NK_DEFAULT_COMMAND_BUFFER_SIZE (4*1024)
#endif

#ifndef NK_BUFFER_DEFAULT_INITIAL_SIZE
#define NK_BUFFER_DEFAULT_INITIAL_SIZE (4*1024)
#endif

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
#include <stdlib.h> /* malloc, free */
#endif
#ifdef NK_INCLUDE_STANDARD_IO
#include <stdio.h> /* fopen, fclose,... */
#include <stdarg.h>
#endif

#ifndef NK_ASSERT
#include <assert.h>
#define NK_ASSERT(expr) assert(expr)
#endif

#ifndef NK_MEMSET
#define NK_MEMSET nk_memset
#endif
#ifndef NK_MEMCPY
#define NK_MEMCPY nk_memcopy
#endif
#ifndef NK_SQRT
#define NK_SQRT nk_sqrt
#endif
#ifndef NK_SIN
#define NK_SIN nk_sin
#endif
#ifndef NK_COS
#define NK_COS nk_cos
#endif

/* ==============================================================
 *                          MATH
 * =============================================================== */

#define NK_MIN(a,b) ((a) < (b) ? (a) : (b))
#define NK_MAX(a,b) ((a) < (b) ? (b) : (a))
#define NK_CLAMP(i,v,x) (NK_MAX(NK_MIN(v,x), i))

#define NK_PI 3.141592654f
#define NK_UTF_INVALID 0xFFFD
#define NK_MAX_FLOAT_PRECISION 2

#define NK_UNUSED(x) ((void)(x))
#define NK_SATURATE(x) (NK_MAX(0, NK_MIN(1.0f, x)))
#define NK_LEN(a) (sizeof(a)/sizeof(a)[0])
#define NK_ABS(a) (((a) < 0) ? -(a) : (a))
#define NK_BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
#define NK_INBOX(px, py, x, y, w, h)\
    (NK_BETWEEN(px,x,x+w) && NK_BETWEEN(py,y,y+h))

#define NK_INTERSECT(x0, y0, w0, h0, x1, y1, w1, h1) \
    (!(((x1 > (x0 + w0)) || ((x1 + w1) < x0) || (y1 > (y0 + h0)) || (y1 + h1) < y0)))

#define NK_CONTAINS(x, y, w, h, bx, by, bw, bh)\
    (NK_INBOX(x,y, bx, by, bw, bh) && NK_INBOX(x+w,y+h, bx, by, bw, bh))


#define nk_vec2_sub(a, b) nk_vec2((a).x - (b).x, (a).y - (b).y)
#define nk_vec2_add(a, b) nk_vec2((a).x + (b).x, (a).y + (b).y)
#define nk_vec2_len_sqr(a) ((a).x*(a).x+(a).y*(a).y)
#define nk_vec2_muls(a, t) nk_vec2((a).x * (t), (a).y * (t))

#define nk_ptr_add(t, p, i) ((t*)((void*)((nk_byte*)(p) + (i))))
#define nk_ptr_add_const(t, p, i) ((const t*)((const void*)((const nk_byte*)(p) + (i))))
#define nk_zero_struct(s) nk_zero(&s, sizeof(s))

/* ==============================================================
 *                          ALIGNMENT
 * =============================================================== */

/* Pointer to Integer type conversion for pointer alignment */
#if defined(__PTRDIFF_TYPE__) /* This case should work for GCC*/
# define NK_UINT_TO_PTR(x) ((void*)(__PTRDIFF_TYPE__)(x))
# define NK_PTR_TO_UINT(x) ((nk_size)(__PTRDIFF_TYPE__)(x))
#elif !defined(__GNUC__) /* works for compilers other than LLVM */
# define NK_UINT_TO_PTR(x) ((void*)&((char*)0)[x])
# define NK_PTR_TO_UINT(x) ((nk_size)(((char*)x)-(char*)0))
#elif defined(NK_USE_FIXED_TYPES) /* used if we have <stdint.h> */
# define NK_UINT_TO_PTR(x) ((void*)(uintptr_t)(x))
# define NK_PTR_TO_UINT(x) ((uintptr_t)(x))
#else /* generates warning but works */
# define NK_UINT_TO_PTR(x) ((void*)(x))
# define NK_PTR_TO_UINT(x) ((nk_size)(x))
#endif

#define NK_ALIGN_PTR(x, mask)\
    (NK_UINT_TO_PTR((NK_PTR_TO_UINT((nk_byte*)(x) + (mask-1)) & ~(mask-1))))

#define NK_ALIGN_PTR_BACK(x, mask)\
    (NK_UINT_TO_PTR((NK_PTR_TO_UINT((nk_byte*)(x)) & ~(mask-1))))


#ifdef __cplusplus
template<typename T> struct nk_alignof;
template<typename T, int size_diff> struct nk_helper{enum {value = size_diff};};
template<typename T> struct nk_helper<T,0>{enum {value = nk_alignof<T>::value};};
template<typename T> struct nk_alignof{struct Big {T x; char c;}; enum {
    diff = sizeof(Big) - sizeof(T), value = nk_helper<Big, diff>::value};};
#define NK_ALIGNOF(t) (nk_alignof<t>::value);
#else
#define NK_ALIGNOF(t) ((char*)(&((struct {char c; t _h;}*)0)->_h) - (char*)0)
#endif

/* make sure correct type size */
typedef int nk__check_size[(sizeof(nk_size) >= sizeof(void*)) ? 1 : -1];
typedef int nk__check_ptr[(sizeof(nk_ptr) == sizeof(void*)) ? 1 : -1];
typedef int nk__check_flags[(sizeof(nk_flags) >= 4) ? 1 : -1];
typedef int nk__check_rune[(sizeof(nk_rune) >= 4) ? 1 : -1];
typedef int nk__check_ushort[(sizeof(nk_ushort) == 2) ? 1 : -1];
typedef int nk__check_short[(sizeof(nk_short) == 2) ? 1 : -1];
typedef int nk__check_uint[(sizeof(nk_uint) == 4) ? 1 : -1];
typedef int nk__check_int[(sizeof(nk_int) == 4) ? 1 : -1];
typedef int nk__check_byte[(sizeof(nk_byte) == 1) ? 1 : -1];

NK_GLOBAL const struct nk_rect nk_null_rect = {-8192.0f, -8192.0f, 16384, 16384};
NK_GLOBAL const float NK_FLOAT_PRECISION = 0.00000000000001f;
/*
 * ==============================================================
 *
 *                          MATH
 *
 * ===============================================================
 */

/*  Since nuklear is supposed to work on all systems providing floating point
    math without any dependencies I also had to implement my own math functions
    for sqrt, sin and cos. Since the actual highly accurate implementations for
    the standard library functions are quite complex and I do not need high
    precision for my use cases I use approximations.

    Sqrt
    ----
    For square root nuklear uses the famous fast inverse square root:
    https://en.wikipedia.org/wiki/Fast_inverse_square_root with
    slightly tweaked magic constant. While on todays hardware it is
    probably not faster it is still fast and accurate enough for
    nuklear's use cases. IMPORTANT: this requires float format IEEE 754

    Sine/Cosine
    -----------
    All constants inside both function are generated Remez's minimax
    approximations for value range 0...2*PI. The reason why I decided to
    approximate exactly that range is that nuklear only needs sine and
    cosine to generate circles which only requires that exact range.
    In addition I used Remez instead of Taylor for additional precision:
    www.lolengine.net/blog/2011/12/21/better-function-approximatations.

    The tool I used to generate constants for both sine and cosine
    (it can actually approximate a lot more functions) can be
    found here: www.lolengine.net/wiki/oss/lolremez
*/

NK_INTERN float
nk_inv_sqrt(float number)
{
    float x2;
    const float threehalfs = 1.5f;
    union {nk_uint i; float f;} conv = {0};
    conv.f = number;
    x2 = number * 0.5f;
    conv.i = 0x5f375A84 - (conv.i >> 1);
    conv.f = conv.f * (threehalfs - (x2 * conv.f * conv.f));
    return conv.f;
}

NK_INTERN float
nk_sqrt(float x)
{
    return x * nk_inv_sqrt(x);
}

NK_INTERN float
nk_sin(float x)
{
    NK_STORAGE const float a0 = +1.91059300966915117e-31f;
    NK_STORAGE const float a1 = +1.00086760103908896f;
    NK_STORAGE const float a2 = -1.21276126894734565e-2f;
    NK_STORAGE const float a3 = -1.38078780785773762e-1f;
    NK_STORAGE const float a4 = -2.67353392911981221e-2f;
    NK_STORAGE const float a5 = +2.08026600266304389e-2f;
    NK_STORAGE const float a6 = -3.03996055049204407e-3f;
    NK_STORAGE const float a7 = +1.38235642404333740e-4f;
    return a0 + x*(a1 + x*(a2 + x*(a3 + x*(a4 + x*(a5 + x*(a6 + x*a7))))));
}

NK_INTERN float
nk_cos(float x)
{
    NK_STORAGE const float a0 = +1.00238601909309722f;
    NK_STORAGE const float a1 = -3.81919947353040024e-2f;
    NK_STORAGE const float a2 = -3.94382342128062756e-1f;
    NK_STORAGE const float a3 = -1.18134036025221444e-1f;
    NK_STORAGE const float a4 = +1.07123798512170878e-1f;
    NK_STORAGE const float a5 = -1.86637164165180873e-2f;
    NK_STORAGE const float a6 = +9.90140908664079833e-4f;
    NK_STORAGE const float a7 = -5.23022132118824778e-14f;
    return a0 + x*(a1 + x*(a2 + x*(a3 + x*(a4 + x*(a5 + x*(a6 + x*a7))))));
}

NK_INTERN nk_uint
nk_round_up_pow2(nk_uint v)
{
    v--;
    v |= v >> 1;
    v |= v >> 2;
    v |= v >> 4;
    v |= v >> 8;
    v |= v >> 16;
    v++;
    return v;
}

NK_API struct nk_rect
nk_get_null_rect(void)
{
    return nk_null_rect;
}

NK_API struct nk_rect
nk_rect(float x, float y, float w, float h)
{
    struct nk_rect r;
    r.x = x, r.y = y;
    r.w = w, r.h = h;
    return r;
}

NK_API struct nk_rect
nk_recti(int x, int y, int w, int h)
{
    struct nk_rect r;
    r.x = (float)x;
    r.y = (float)y;
    r.w = (float)w;
    r.h = (float)h;
    return r;
}

NK_API struct nk_rect
nk_recta(struct nk_vec2 pos, struct nk_vec2 size)
{
    return nk_rect(pos.x, pos.y, size.x, size.y);
}

NK_API struct nk_rect
nk_rectv(const float *r)
{
    return nk_rect(r[0], r[1], r[2], r[3]);
}

NK_API struct nk_rect
nk_rectiv(const int *r)
{
    return nk_recti(r[0], r[1], r[2], r[3]);
}

NK_INTERN struct nk_rect
nk_shrink_rect(struct nk_rect r, float amount)
{
    struct nk_rect res;
    r.w = NK_MAX(r.w, 2 * amount);
    r.h = NK_MAX(r.h, 2 * amount);
    res.x = r.x + amount;
    res.y = r.y + amount;
    res.w = r.w - 2 * amount;
    res.h = r.h - 2 * amount;
    return res;
}

NK_INTERN struct nk_rect
nk_pad_rect(struct nk_rect r, struct nk_vec2 pad)
{
    r.w = NK_MAX(r.w, 2 * pad.x);
    r.h = NK_MAX(r.h, 2 * pad.y);
    r.x += pad.x; r.y += pad.y;
    r.w -= 2 * pad.x;
    r.h -= 2 * pad.y;
    return r;
}

NK_API struct nk_vec2
nk_vec2(float x, float y)
{
    struct nk_vec2 ret;
    ret.x = x; ret.y = y;
    return ret;
}

NK_API struct nk_vec2
nk_vec2i(int x, int y)
{
    struct nk_vec2 ret;
    ret.x = (float)x;
    ret.y = (float)y;
    return ret;
}

NK_API struct nk_vec2
nk_vec2v(const float *v)
{
    return nk_vec2(v[0], v[1]);
}

NK_API struct nk_vec2
nk_vec2iv(const int *v)
{
    return nk_vec2i(v[0], v[1]);
}
/*
 * ==============================================================
 *
 *                          UTIL
 *
 * ===============================================================
 */

NK_INTERN int nk_str_match_here(const char *regexp, const char *text);
NK_INTERN int nk_str_match_star(int c, const char *regexp, const char *text);
NK_INTERN int nk_is_lower(int c) {return (c >= 'a' && c <= 'z') || (c >= 0xE0 && c <= 0xFF);}
NK_INTERN int nk_is_upper(int c){return (c >= 'A' && c <= 'Z') || (c >= 0xC0 && c <= 0xDF);}
NK_INTERN int nk_to_upper(int c) {return (c >= 'a' && c <= 'z') ? (c - ('a' - 'A')) : c;}
NK_INTERN int nk_to_lower(int c) {return (c >= 'A' && c <= 'Z') ? (c - ('a' + 'A')) : c;}

NK_INTERN void*
nk_memcopy(void *dst0, const void *src0, nk_size length)
{
    nk_ptr t;
    char *dst = (char*)dst0;
    const char *src = (const char*)src0;
    if (length == 0 || dst == src)
        goto done;

    #define nk_word int
    #define nk_wsize sizeof(nk_word)
    #define nk_wmask (nk_wsize-1)
    #define NK_TLOOP(s) if (t) NK_TLOOP1(s)
    #define NK_TLOOP1(s) do { s; } while (--t)

    if (dst < src) {
        t = (nk_ptr)src; /* only need low bits */
        if ((t | (nk_ptr)dst) & nk_wmask) {
            if ((t ^ (nk_ptr)dst) & nk_wmask || length < nk_wsize)
                t = length;
            else
                t = nk_wsize - (t & nk_wmask);
            length -= t;
            NK_TLOOP1(*dst++ = *src++);
        }
        t = length / nk_wsize;
        NK_TLOOP(*(nk_word*)(void*)dst = *(const nk_word*)(const void*)src;
            src += nk_wsize; dst += nk_wsize);
        t = length & nk_wmask;
        NK_TLOOP(*dst++ = *src++);
    } else {
        src += length;
        dst += length;
        t = (nk_ptr)src;
        if ((t | (nk_ptr)dst) & nk_wmask) {
            if ((t ^ (nk_ptr)dst) & nk_wmask || length <= nk_wsize)
                t = length;
            else
                t &= nk_wmask;
            length -= t;
            NK_TLOOP1(*--dst = *--src);
        }
        t = length / nk_wsize;
        NK_TLOOP(src -= nk_wsize; dst -= nk_wsize;
            *(nk_word*)(void*)dst = *(const nk_word*)(const void*)src);
        t = length & nk_wmask;
        NK_TLOOP(*--dst = *--src);
    }
    #undef nk_word
    #undef nk_wsize
    #undef nk_wmask
    #undef NK_TLOOP
    #undef NK_TLOOP1
done:
    return (dst0);
}

NK_INTERN void
nk_memset(void *ptr, int c0, nk_size size)
{
    #define nk_word unsigned
    #define nk_wsize sizeof(nk_word)
    #define nk_wmask (nk_wsize - 1)
    nk_byte *dst = (nk_byte*)ptr;
    unsigned c = 0;
    nk_size t = 0;

    if ((c = (nk_byte)c0) != 0) {
        c = (c << 8) | c; /* at least 16-bits  */
        if (sizeof(unsigned int) > 2)
            c = (c << 16) | c; /* at least 32-bits*/
    }

    /* too small of a word count */
    dst = (nk_byte*)ptr;
    if (size < 3 * nk_wsize) {
        while (size--) *dst++ = (nk_byte)c0;
        return;
    }

    /* align destination */
    if ((t = NK_PTR_TO_UINT(dst) & nk_wmask) != 0) {
        t = nk_wsize -t;
        size -= t;
        do {
            *dst++ = (nk_byte)c0;
        } while (--t != 0);
    }

    /* fill word */
    t = size / nk_wsize;
    do {
        *(nk_word*)((void*)dst) = c;
        dst += nk_wsize;
    } while (--t != 0);

    /* fill trailing bytes */
    t = (size & nk_wmask);
    if (t != 0) {
        do {
            *dst++ = (nk_byte)c0;
        } while (--t != 0);
    }

    #undef nk_word
    #undef nk_wsize
    #undef nk_wmask
}

NK_INTERN void
nk_zero(void *ptr, nk_size size)
{
    NK_ASSERT(ptr);
    NK_MEMSET(ptr, 0, size);
}

NK_API int
nk_strlen(const char *str)
{
    int siz = 0;
    NK_ASSERT(str);
    while (str && *str++ != '\0') siz++;
    return siz;
}

NK_API int
nk_strtof(float *number, const char *buffer)
{
    float m;
    float neg = 1.0f;
    const char *p = buffer;
    float floatvalue = 0;

    NK_ASSERT(number);
    NK_ASSERT(buffer);
    if (!number || !buffer) return 0;
    *number = 0;

    /* skip whitespace */
    while (*p && *p == ' ') p++;
    if (*p == '-') {
        neg = -1.0f;
        p++;
    }

    while( *p && *p != '.' && *p != 'e' ) {
        floatvalue = floatvalue * 10.0f + (float) (*p - '0');
        p++;
    }

    if ( *p == '.' ) {
        p++;
        for(m = 0.1f; *p && *p != 'e'; p++ ) {
            floatvalue = floatvalue + (float) (*p - '0') * m;
            m *= 0.1f;
        }
    }
    if ( *p == 'e' ) {
        int i, pow, div;
        p++;
        if ( *p == '-' ) {
            div = nk_true;
            p++;
        } else if ( *p == '+' ) {
            div = nk_false;
            p++;
        } else div = nk_false;

        for ( pow = 0; *p; p++ )
            pow = pow * 10 + (int) (*p - '0');

        for ( m = 1.0, i = 0; i < pow; i++ )
            m *= 10.0f;

        if ( div )
            floatvalue /= m;
        else floatvalue *= m;
    }
    *number = floatvalue * neg;
    return 1;
}

NK_API int
nk_stricmp(const char *s1, const char *s2)
{
    nk_int c1,c2,d;
    do {
        c1 = *s1++;
        c2 = *s2++;
        d = c1 - c2;
        while (d) {
            if (c1 <= 'Z' && c1 >= 'A') {
                d += ('a' - 'A');
                if (!d) break;
            }
            if (c2 <= 'Z' && c2 >= 'A') {
                d -= ('a' - 'A');
                if (!d) break;
            }
            return ((d >= 0) << 1) - 1;
        }
    } while (c1);
    return 0;
}

NK_API int
nk_stricmpn(const char *s1, const char *s2, int n)
{
    int c1,c2,d;
    NK_ASSERT(n >= 0);
    do {
        c1 = *s1++;
        c2 = *s2++;
        if (!n--) return 0;

        d = c1 - c2;
        while (d) {
            if (c1 <= 'Z' && c1 >= 'A') {
                d += ('a' - 'A');
                if (!d) break;
            }
            if (c2 <= 'Z' && c2 >= 'A') {
                d -= ('a' - 'A');
                if (!d) break;
            }
            return ((d >= 0) << 1) - 1;
        }
    } while (c1);
    return 0;
}

NK_INTERN int
nk_str_match_here(const char *regexp, const char *text)
{
    if (regexp[0] == '\0')
        return 1;
    if (regexp[1] == '*')
        return nk_str_match_star(regexp[0], regexp+2, text);
    if (regexp[0] == '$' && regexp[1] == '\0')
        return *text == '\0';
    if (*text!='\0' && (regexp[0]=='.' || regexp[0]==*text))
        return nk_str_match_here(regexp+1, text+1);
    return 0;
}

NK_INTERN int
nk_str_match_star(int c, const char *regexp, const char *text)
{
    do {/* a '* matches zero or more instances */
        if (nk_str_match_here(regexp, text))
            return 1;
    } while (*text != '\0' && (*text++ == c || c == '.'));
    return 0;
}

NK_API int
nk_strfilter(const char *text, const char *regexp)
{
    /*
    c    matches any literal character c
    .    matches any single character
    ^    matches the beginning of the input string
    $    matches the end of the input string
    *    matches zero or more occurrences of the previous character*/

    if (regexp[0] == '^')
        return nk_str_match_here(regexp+1, text);
    do {    /* must look even if string is empty */
        if (nk_str_match_here(regexp, text))
            return 1;
    } while (*text++ != '\0');
    return 0;
}

NK_API int
nk_strmatch_fuzzy_text(const char *str, int str_len,
    const char *pattern, int *out_score)
{
    /* Returns true if each character in pattern is found sequentially within str
     * if found then outScore is also set. Score value has no intrinsic meaning.
     * Range varies with pattern. Can only compare scores with same search pattern. */


    /* ------- scores --------- */
    /* bonus for adjacent matches */
    #define NK_ADJACENCY_BONUS 5
    /* bonus if match occurs after a separator */
    #define NK_SEPARATOR_BONUS 10
    /* bonus if match is uppercase and prev is lower */
    #define NK_CAMEL_BONUS 10
    /* penalty applied for every letter in str before the first match */
    #define NK_LEADING_LETTER_PENALTY (-3)
    /* maximum penalty for leading letters */
    #define NK_MAX_LEADING_LETTER_PENALTY (-9)
    /* penalty for every letter that doesn't matter */
    #define NK_UNMATCHED_LETTER_PENALTY (-1)


    /* loop variables */
    int score = 0;
    char const * pattern_iter = pattern;
    int str_iter = 0;
    int prev_matched = nk_false;
    int prev_lower = nk_false;
    /* true so if first letter match gets separator bonus*/
    int prev_separator = nk_true;

    /* use "best" matched letter if multiple string letters match the pattern */
    char const * best_letter = 0;
    int best_letter_score = 0;

    /* loop over strings */
    NK_ASSERT(str);
    NK_ASSERT(pattern);
    if (!str || !str_len || !pattern) return 0;
    while (str_iter < str_len)
    {
        const char pattern_letter = *pattern_iter;
        const char str_letter = str[str_iter];

        int next_match = *pattern_iter != '\0' &&
            nk_to_lower(pattern_letter) == nk_to_lower(str_letter);
        int rematch = best_letter && nk_to_lower(*best_letter) == nk_to_lower(str_letter);

        int advanced = next_match && best_letter;
        int pattern_repeat = best_letter && *pattern_iter != '\0';
        pattern_repeat = pattern_repeat &&
            nk_to_lower(*best_letter) == nk_to_lower(pattern_letter);

        if (advanced || pattern_repeat) {
            score += best_letter_score;
            best_letter = 0;
            best_letter_score = 0;
        }

        if (next_match || rematch)
        {
            int new_score = 0;
            /* Apply penalty for each letter before the first pattern match */
            if (pattern_iter == pattern)
            {
                int count = (int)(&str[str_iter] - str);
                int penalty = NK_LEADING_LETTER_PENALTY * count;
                if (penalty < NK_MAX_LEADING_LETTER_PENALTY)
                    penalty = NK_MAX_LEADING_LETTER_PENALTY;

                score += penalty;
            }

            /* apply bonus for consecutive bonuses */
            if (prev_matched)
                new_score += NK_ADJACENCY_BONUS;

            /* apply bonus for matches after a separator */
            if (prev_separator)
                new_score += NK_SEPARATOR_BONUS;

            /* apply bonus across camel case boundaries */
            if (prev_lower && nk_is_upper(str_letter))
                new_score += NK_CAMEL_BONUS;

            /* update pattern iter IFF the next pattern letter was matched */
            if (next_match)
                ++pattern_iter;

            /* update best letter in str which may be for a "next" letter or a rematch */
            if (new_score >= best_letter_score)
            {
                /* apply penalty for now skipped letter */
                if (best_letter != 0)
                    score += NK_UNMATCHED_LETTER_PENALTY;

                best_letter = &str[str_iter];
                best_letter_score = new_score;
            }

            prev_matched = nk_true;
        }
        else
        {
            score += NK_UNMATCHED_LETTER_PENALTY;
            prev_matched = nk_false;
        }

        /* separators should be more easily defined */
        prev_lower = nk_is_lower(str_letter) != 0;
        prev_separator = str_letter == '_' || str_letter == ' ';

        ++str_iter;
    }

    /* apply score for last match */
    if (best_letter)
        score += best_letter_score;

    /* did not match full pattern */
    if (*pattern_iter != '\0')
        return nk_false;

    if (out_score)
        *out_score = score;
    return nk_true;
}

#ifdef NK_INCLUDE_STANDARD_IO
NK_API int
nk_strfmt(char *buf, int buf_size, const char *fmt,...)
{
    int w;
    va_list args;
    va_start(args, fmt);
    w = vsnprintf(buf, (nk_size)buf_size, fmt, args);
    va_end(args);
    buf[buf_size-1] = 0;
    return (w == -1) ?(int)buf_size:w;
}

NK_INTERN int
nk_strfmtv(char *buf, int buf_size, const char *fmt, va_list args)
{
    int w = vsnprintf(buf, (nk_size)buf_size, fmt, args);
    buf[buf_size-1] = 0;
    return (w == -1) ? (int)buf_size:w;
}
#endif

NK_INTERN int
nk_string_float_limit(char *string, int prec)
{
    int dot = 0;
    char *c = string;
    while (*c) {
        if (*c == '.') {
            dot = 1;
            c++;
            continue;
        }
        if (dot == (prec+1)) {
            *c = 0;
            break;
        }
        if (dot > 0) dot++;
        c++;
    }
    return (int)(c - string);
}

NK_INTERN float
nk_pow(float x, int n)
{
    /*  check the sign of n */
    float r = 1;
    int plus = n >= 0;
    n = (plus) ? n : -n;
    while (n > 0) {
        if ((n & 1) == 1)
            r *= x;
        n /= 2;
        x *= x;
    }
    return plus ? r : 1.0f / r;
}

NK_INTERN int
nk_ifloor(float x)
{
    x = (float)((int)x - ((x < 0.0) ? 1 : 0));
    return (int)x;
}

NK_INTERN int
nk_iceil(float x)
{
    if (x >= 0) {
        int i = (int)x;
        return i;
    } else {
        int t = (int)x;
        float r = x - (float)t;
        return (r > 0.0f) ? t+1: t;
    }
}

NK_INTERN int
nk_log10(float n)
{
    int neg;
    int ret;
    int exp = 0;

    neg = (n < 0) ? 1 : 0;
    ret = (neg) ? (int)-n : (int)n;
    while ((ret / 10) > 0) {
        ret /= 10;
        exp++;
    }
    if (neg) exp = -exp;
    return exp;
}

NK_INTERN int
nk_ftos(char *s, float n)
{
    int useExp = 0;
    int digit = 0, m = 0, m1 = 0;
    char *c = s;
    int neg = 0;

    if (n == 0.0) {
        s[0] = '0'; s[1] = '\0';
        return 1;
    }

    neg = (n < 0);
    if (neg) n = -n;

    /* calculate magnitude */
    m = nk_log10(n);
    useExp = (m >= 14 || (neg && m >= 9) || m <= -9);
    if (neg) *(c++) = '-';

    /* set up for scientific notation */
    if (useExp) {
        if (m < 0)
           m -= 1;
        n = n / nk_pow(10.0, m);
        m1 = m;
        m = 0;
    }
    if (m < 1.0) {
        m = 0;
    }

    /* convert the number */
    while (n > NK_FLOAT_PRECISION || m >= 0) {
        float weight = nk_pow(10.0, m);
        if (weight > 0) {
            float t = (float)n / weight;
            digit = nk_ifloor(t);
            n -= ((float)digit * weight);
            *(c++) = (char)('0' + (char)digit);
        }
        if (m == 0 && n > 0)
            *(c++) = '.';
        m--;
    }

    if (useExp) {
        /* convert the exponent */
        int i, j;
        *(c++) = 'e';
        if (m1 > 0) {
            *(c++) = '+';
        } else {
            *(c++) = '-';
            m1 = -m1;
        }
        m = 0;
        while (m1 > 0) {
            *(c++) = (char)('0' + (char)(m1 % 10));
            m1 /= 10;
            m++;
        }
        c -= m;
        for (i = 0, j = m-1; i<j; i++, j--) {
            /* swap without temporary */
            c[i] ^= c[j];
            c[j] ^= c[i];
            c[i] ^= c[j];
        }
        c += m;
    }
    *(c) = '\0';
    return (int)(c - s);
}

NK_API nk_hash
nk_murmur_hash(const void * key, int len, nk_hash seed)
{
    /* 32-Bit MurmurHash3: https://code.google.com/p/smhasher/wiki/MurmurHash3*/
    #define NK_ROTL(x,r) ((x) << (r) | ((x) >> (32 - r)))
    union {const nk_uint *i; const nk_byte *b;} conv = {0};
    const nk_byte *data = (const nk_byte*)key;
    const int nblocks = len/4;
    nk_uint h1 = seed;
    const nk_uint c1 = 0xcc9e2d51;
    const nk_uint c2 = 0x1b873593;
    const nk_byte *tail;
    const nk_uint *blocks;
    nk_uint k1;
    int i;

    /* body */
    if (!key) return 0;
    conv.b = (data + nblocks*4);
    blocks = (const nk_uint*)conv.i;
    for (i = -nblocks; i; ++i) {
        k1 = blocks[i];
        k1 *= c1;
        k1 = NK_ROTL(k1,15);
        k1 *= c2;

        h1 ^= k1;
        h1 = NK_ROTL(h1,13);
        h1 = h1*5+0xe6546b64;
    }

    /* tail */
    tail = (const nk_byte*)(data + nblocks*4);
    k1 = 0;
    switch (len & 3) {
    case 3: k1 ^= (nk_uint)(tail[2] << 16);
    case 2: k1 ^= (nk_uint)(tail[1] << 8u);
    case 1: k1 ^= tail[0];
            k1 *= c1;
            k1 = NK_ROTL(k1,15);
            k1 *= c2;
            h1 ^= k1;
    default: break;
    }

    /* finalization */
    h1 ^= (nk_uint)len;
    /* fmix32 */
    h1 ^= h1 >> 16;
    h1 *= 0x85ebca6b;
    h1 ^= h1 >> 13;
    h1 *= 0xc2b2ae35;
    h1 ^= h1 >> 16;

    #undef NK_ROTL
    return h1;
}

#ifdef NK_INCLUDE_STANDARD_IO
NK_INTERN char*
nk_file_load(const char* path, nk_size* siz, struct nk_allocator *alloc)
{
    char *buf;
    FILE *fd;
    long ret;

    NK_ASSERT(path);
    NK_ASSERT(siz);
    NK_ASSERT(alloc);
    if (!path || !siz || !alloc)
        return 0;

    fd = fopen(path, "rb");
    if (!fd) return 0;
    fseek(fd, 0, SEEK_END);
    ret = ftell(fd);
    if (ret < 0) {
        fclose(fd);
        return 0;
    }
    *siz = (nk_size)ret;
    fseek(fd, 0, SEEK_SET);
    buf = (char*)alloc->alloc(alloc->userdata,0, *siz);
    NK_ASSERT(buf);
    if (!buf) {
        fclose(fd);
        return 0;
    }
    *siz = (nk_size)fread(buf, *siz, 1, fd);
    fclose(fd);
    return buf;
}
#endif

/*
 * ==============================================================
 *
 *                          COLOR
 *
 * ===============================================================
 */

NK_INTERN int
nk_parse_hex(const char *p, int length)
{
    int i = 0;
    int len = 0;
    while (len < length) {
        i <<= 4;
        if (p[len] >= 'a' && p[len] <= 'f')
            i += ((p[len] - 'a') + 10);
        else if (p[len] >= 'A' && p[len] <= 'F') {
            i += ((p[len] - 'A') + 10);
        } else i += (p[len] - '0');
        len++;
    }
    return i;
}

NK_API struct nk_color
nk_rgba(int r, int g, int b, int a)
{
    struct nk_color ret;
    ret.r = (nk_byte)NK_CLAMP(0, r, 255);
    ret.g = (nk_byte)NK_CLAMP(0, g, 255);
    ret.b = (nk_byte)NK_CLAMP(0, b, 255);
    ret.a = (nk_byte)NK_CLAMP(0, a, 255);
    return ret;
}

NK_API struct nk_color
nk_rgb_hex(const char *rgb)
{
    struct nk_color col;
    const char *c = rgb;
    if (*c == '#') c++;
    col.r = (nk_byte)nk_parse_hex(c, 2);
    col.g = (nk_byte)nk_parse_hex(c+2, 2);
    col.b = (nk_byte)nk_parse_hex(c+4, 2);
    col.a = 255;
    return col;
}

NK_API struct nk_color
nk_rgba_hex(const char *rgb)
{
    struct nk_color col;
    const char *c = rgb;
    if (*c == '#') c++;
    col.r = (nk_byte)nk_parse_hex(c, 2);
    col.g = (nk_byte)nk_parse_hex(c+2, 2);
    col.b = (nk_byte)nk_parse_hex(c+4, 2);
    col.a = (nk_byte)nk_parse_hex(c+6, 2);
    return col;
}

NK_API void
nk_color_hex_rgba(char *output, struct nk_color col)
{
    #define NK_TO_HEX(i) ((i) <= 9 ? '0' + (i): 'A' - 10 + (i))
    output[0] = (char)NK_TO_HEX((col.r & 0x0F));
    output[1] = (char)NK_TO_HEX((col.r & 0xF0) >> 4);
    output[2] = (char)NK_TO_HEX((col.g & 0x0F));
    output[3] = (char)NK_TO_HEX((col.g & 0xF0) >> 4);
    output[4] = (char)NK_TO_HEX((col.b & 0x0F));
    output[5] = (char)NK_TO_HEX((col.b & 0xF0) >> 4);
    output[6] = (char)NK_TO_HEX((col.a & 0x0F));
    output[7] = (char)NK_TO_HEX((col.a & 0xF0) >> 4);
    output[8] = '\0';
    #undef NK_TO_HEX
}

NK_API void
nk_color_hex_rgb(char *output, struct nk_color col)
{
    #define NK_TO_HEX(i) ((i) <= 9 ? '0' + (i): 'A' - 10 + (i))
    output[0] = (char)NK_TO_HEX((col.r & 0x0F));
    output[1] = (char)NK_TO_HEX((col.r & 0xF0) >> 4);
    output[2] = (char)NK_TO_HEX((col.g & 0x0F));
    output[3] = (char)NK_TO_HEX((col.g & 0xF0) >> 4);
    output[4] = (char)NK_TO_HEX((col.b & 0x0F));
    output[5] = (char)NK_TO_HEX((col.b & 0xF0) >> 4);
    output[6] = '\0';
    #undef NK_TO_HEX
}

NK_API struct nk_color
nk_rgba_iv(const int *c)
{
    return nk_rgba(c[0], c[1], c[2], c[3]);
}

NK_API struct nk_color
nk_rgba_bv(const nk_byte *c)
{
    return nk_rgba(c[0], c[1], c[2], c[3]);
}

NK_API struct nk_color
nk_rgb(int r, int g, int b)
{
    struct nk_color ret;
    ret.r =(nk_byte)NK_CLAMP(0, r, 255);
    ret.g =(nk_byte)NK_CLAMP(0, g, 255);
    ret.b =(nk_byte)NK_CLAMP(0, b, 255);
    ret.a =(nk_byte)255;
    return ret;
}

NK_API struct nk_color
nk_rgb_iv(const int *c)
{
    return nk_rgb(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_rgb_bv(const nk_byte* c)
{
    return nk_rgb(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_rgba_u32(nk_uint in)
{
    struct nk_color ret;
    ret.r = (in & 0xFF);
    ret.g = ((in >> 8) & 0xFF);
    ret.b = ((in >> 16) & 0xFF);
    ret.a = (nk_byte)((in >> 24) & 0xFF);
    return ret;
}

NK_API struct nk_color
nk_rgba_f(float r, float g, float b, float a)
{
    struct nk_color ret;
    ret.r = (nk_byte)(NK_SATURATE(r) * 255.0f);
    ret.g = (nk_byte)(NK_SATURATE(g) * 255.0f);
    ret.b = (nk_byte)(NK_SATURATE(b) * 255.0f);
    ret.a = (nk_byte)(NK_SATURATE(a) * 255.0f);
    return ret;
}

NK_API struct nk_color
nk_rgba_fv(const float *c)
{
    return nk_rgba_f(c[0], c[1], c[2], c[3]);
}

NK_API struct nk_color
nk_rgb_f(float r, float g, float b)
{
    struct nk_color ret;
    ret.r = (nk_byte)(NK_SATURATE(r) * 255.0f);
    ret.g = (nk_byte)(NK_SATURATE(g) * 255.0f);
    ret.b = (nk_byte)(NK_SATURATE(b) * 255.0f);
    ret.a = 255;
    return ret;
}

NK_API struct nk_color
nk_rgb_fv(const float *c)
{
    return nk_rgb_f(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_hsv(int h, int s, int v)
{
    return nk_hsva(h, s, v, 255);
}

NK_API struct nk_color
nk_hsv_iv(const int *c)
{
    return nk_hsv(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_hsv_bv(const nk_byte *c)
{
    return nk_hsv(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_hsv_f(float h, float s, float v)
{
    return nk_hsva_f(h, s, v, 1.0f);
}

NK_API struct nk_color
nk_hsv_fv(const float *c)
{
    return nk_hsv_f(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_hsva(int h, int s, int v, int a)
{
    float hf = ((float)NK_CLAMP(0, h, 255)) / 255.0f;
    float sf = ((float)NK_CLAMP(0, s, 255)) / 255.0f;
    float vf = ((float)NK_CLAMP(0, v, 255)) / 255.0f;
    float af = ((float)NK_CLAMP(0, a, 255)) / 255.0f;
    return nk_hsva_f(hf, sf, vf, af);
}

NK_API struct nk_color
nk_hsva_iv(const int *c)
{
    return nk_hsva(c[0], c[1], c[2], c[3]);
}

NK_API struct nk_color
nk_hsva_bv(const nk_byte *c)
{
    return nk_hsva(c[0], c[1], c[2], c[3]);
}

NK_API struct nk_color
nk_hsva_f(float h, float s, float v, float a)
{
    struct nk_colorf {float r,g,b;} out = {0,0,0};
    float p, q, t, f;
    int i;

    if (s <= 0.0f) {
        out.r = v; out.g = v; out.b = v;
        return nk_rgb_f(out.r, out.g, out.b);
    }

    h = h / (60.0f/360.0f);
    i = (int)h;
    f = h - (float)i;
    p = v * (1.0f - s);
    q = v * (1.0f - (s * f));
    t = v * (1.0f - s * (1.0f - f));

    switch (i) {
    case 0: out.r = v; out.g = t; out.b = p; break;
    case 1: out.r = q; out.g = v; out.b = p; break;
    case 2: out.r = p; out.g = v; out.b = t; break;
    case 3: out.r = p; out.g = q; out.b = v; break;
    case 4: out.r = t; out.g = p; out.b = v; break;
    case 5: default: out.r = v; out.g = p; out.b = q; break;
    }
    return nk_rgba_f(out.r, out.g, out.b, a);
}

NK_API struct nk_color
nk_hsva_fv(const float *c)
{
    return nk_hsva_f(c[0], c[1], c[2], c[3]);
}

NK_API nk_uint
nk_color_u32(struct nk_color in)
{
    nk_uint out = (nk_uint)in.r;
    out |= ((nk_uint)in.g << 8);
    out |= ((nk_uint)in.b << 16);
    out |= ((nk_uint)in.a << 24);
    return out;
}

NK_API void
nk_color_f(float *r, float *g, float *b, float *a, struct nk_color in)
{
    NK_STORAGE const float s = 1.0f/255.0f;
    *r = (float)in.r * s;
    *g = (float)in.g * s;
    *b = (float)in.b * s;
    *a = (float)in.a * s;
}

NK_API void
nk_color_fv(float *c, struct nk_color in)
{
    nk_color_f(&c[0], &c[1], &c[2], &c[3], in);
}

NK_API void
nk_color_hsv_f(float *out_h, float *out_s, float *out_v, struct nk_color in)
{
    float a;
    nk_color_hsva_f(out_h, out_s, out_v, &a, in);
}

NK_API void
nk_color_hsv_fv(float *out, struct nk_color in)
{
    float a;
    nk_color_hsva_f(&out[0], &out[1], &out[2], &a, in);
}

NK_API void
nk_color_hsva_f(float *out_h, float *out_s,
    float *out_v, float *out_a, struct nk_color in)
{
    float chroma;
    float K = 0.0f;
    float r,g,b,a;

    nk_color_f(&r,&g,&b,&a, in);
    if (g < b) {
        const float t = g; g = b; b = t;
        K = -1.f;
    }
    if (r < g) {
        const float t = r; r = g; g = t;
        K = -2.f/6.0f - K;
    }
    chroma = r - ((g < b) ? g: b);
    *out_h = NK_ABS(K + (g - b)/(6.0f * chroma + 1e-20f));
    *out_s = chroma / (r + 1e-20f);
    *out_v = r;
    *out_a = (float)in.a / 255.0f;
}

NK_API void
nk_color_hsva_fv(float *out, struct nk_color in)
{
    nk_color_hsva_f(&out[0], &out[1], &out[2], &out[3], in);
}

NK_API void
nk_color_hsva_i(int *out_h, int *out_s, int *out_v,
                int *out_a, struct nk_color in)
{
    float h,s,v,a;
    nk_color_hsva_f(&h, &s, &v, &a, in);
    *out_h = (nk_byte)(h * 255.0f);
    *out_s = (nk_byte)(s * 255.0f);
    *out_v = (nk_byte)(v * 255.0f);
    *out_a = (nk_byte)(a * 255.0f);
}

NK_API void
nk_color_hsva_iv(int *out, struct nk_color in)
{
    nk_color_hsva_i(&out[0], &out[1], &out[2], &out[3], in);
}

NK_API void
nk_color_hsva_bv(nk_byte *out, struct nk_color in)
{
    int tmp[4];
    nk_color_hsva_i(&tmp[0], &tmp[1], &tmp[2], &tmp[3], in);
    out[0] = (nk_byte)tmp[0];
    out[1] = (nk_byte)tmp[1];
    out[2] = (nk_byte)tmp[2];
    out[3] = (nk_byte)tmp[3];
}

NK_API void
nk_color_hsv_i(int *out_h, int *out_s, int *out_v, struct nk_color in)
{
    int a;
    nk_color_hsva_i(out_h, out_s, out_v, &a, in);
}

NK_API void
nk_color_hsv_iv(int *out, struct nk_color in)
{
    nk_color_hsv_i(&out[0], &out[1], &out[2], in);
}

NK_API void
nk_color_hsv_bv(nk_byte *out, struct nk_color in)
{
    int tmp[4];
    nk_color_hsv_i(&tmp[0], &tmp[1], &tmp[2], in);
    out[0] = (nk_byte)tmp[0];
    out[1] = (nk_byte)tmp[1];
    out[2] = (nk_byte)tmp[2];
}
/*
 * ==============================================================
 *
 *                          IMAGE
 *
 * ===============================================================
 */

NK_API nk_handle
nk_handle_ptr(void *ptr)
{
    nk_handle handle = {0};
    handle.ptr = ptr;
    return handle;
}

NK_API nk_handle
nk_handle_id(int id)
{
    nk_handle handle;
    handle.id = id;
    return handle;
}

NK_API struct nk_image
nk_subimage_ptr(void *ptr, unsigned short w, unsigned short h, struct nk_rect r)
{
    struct nk_image s;
    nk_zero(&s, sizeof(s));
    s.handle.ptr = ptr;
    s.w = w; s.h = h;
    s.region[0] = (unsigned short)r.x;
    s.region[1] = (unsigned short)r.y;
    s.region[2] = (unsigned short)r.w;
    s.region[3] = (unsigned short)r.h;
    return s;
}

NK_API struct nk_image
nk_subimage_id(int id, unsigned short w, unsigned short h, struct nk_rect r)
{
    struct nk_image s;
    nk_zero(&s, sizeof(s));
    s.handle.id = id;
    s.w = w; s.h = h;
    s.region[0] = (unsigned short)r.x;
    s.region[1] = (unsigned short)r.y;
    s.region[2] = (unsigned short)r.w;
    s.region[3] = (unsigned short)r.h;
    return s;
}

NK_API struct nk_image
nk_image_ptr(void *ptr)
{
    struct nk_image s;
    nk_zero(&s, sizeof(s));
    NK_ASSERT(ptr);
    s.handle.ptr = ptr;
    s.w = 0; s.h = 0;
    s.region[0] = 0;
    s.region[1] = 0;
    s.region[2] = 0;
    s.region[3] = 0;
    return s;
}

NK_API struct nk_image
nk_image_id(int id)
{
    struct nk_image s;
    nk_zero(&s, sizeof(s));
    s.handle.id = id;
    s.w = 0; s.h = 0;
    s.region[0] = 0;
    s.region[1] = 0;
    s.region[2] = 0;
    s.region[3] = 0;
    return s;
}

NK_API int
nk_image_is_subimage(const struct nk_image* img)
{
    NK_ASSERT(img);
    return !(img->w == 0 && img->h == 0);
}

NK_INTERN void
nk_unify(struct nk_rect *clip, const struct nk_rect *a, float x0, float y0,
    float x1, float y1)
{
    NK_ASSERT(a);
    NK_ASSERT(clip);
    clip->x = NK_MAX(a->x, x0);
    clip->y = NK_MAX(a->y, y0);
    clip->w = NK_MIN(a->x + a->w, x1) - clip->x;
    clip->h = NK_MIN(a->y + a->h, y1) - clip->y;
    clip->w = NK_MAX(0, clip->w);
    clip->h = NK_MAX(0, clip->h);
}

NK_API void
nk_triangle_from_direction(struct nk_vec2 *result, struct nk_rect r,
    float pad_x, float pad_y, enum nk_heading direction)
{
    float w_half, h_half;
    NK_ASSERT(result);

    r.w = NK_MAX(2 * pad_x, r.w);
    r.h = NK_MAX(2 * pad_y, r.h);
    r.w = r.w - 2 * pad_x;
    r.h = r.h - 2 * pad_y;

    r.x = r.x + pad_x;
    r.y = r.y + pad_y;

    w_half = r.w / 2.0f;
    h_half = r.h / 2.0f;

    if (direction == NK_UP) {
        result[0] = nk_vec2(r.x + w_half, r.y);
        result[1] = nk_vec2(r.x + r.w, r.y + r.h);
        result[2] = nk_vec2(r.x, r.y + r.h);
    } else if (direction == NK_RIGHT) {
        result[0] = nk_vec2(r.x, r.y);
        result[1] = nk_vec2(r.x + r.w, r.y + h_half);
        result[2] = nk_vec2(r.x, r.y + r.h);
    } else if (direction == NK_DOWN) {
        result[0] = nk_vec2(r.x, r.y);
        result[1] = nk_vec2(r.x + r.w, r.y);
        result[2] = nk_vec2(r.x + w_half, r.y + r.h);
    } else {
        result[0] = nk_vec2(r.x, r.y + h_half);
        result[1] = nk_vec2(r.x + r.w, r.y);
        result[2] = nk_vec2(r.x + r.w, r.y + r.h);
    }
}

NK_INTERN int
nk_text_clamp(const struct nk_user_font *font, const char *text,
    int text_len, float space, int *glyphs, float *text_width)
{
    int glyph_len = 0;
    float last_width = 0;
    nk_rune unicode = 0;
    float width = 0;
    int len = 0;
    int g = 0;

    glyph_len = nk_utf_decode(text, &unicode, text_len);
    while (glyph_len && (width < space) && (len < text_len)) {
        float s;
        len += glyph_len;
        s = font->width(font->userdata, font->height, text, len);

        last_width = width;
        width = s;
        glyph_len = nk_utf_decode(&text[len], &unicode, text_len - len);
        g++;
    }

    *glyphs = g;
    *text_width = last_width;
    return len;
}

enum {NK_DO_NOT_STOP_ON_NEW_LINE, NK_STOP_ON_NEW_LINE};
NK_INTERN struct nk_vec2
nk_text_calculate_text_bounds(const struct nk_user_font *font,
    const char *begin, int byte_len, float row_height, const char **remaining,
    struct nk_vec2 *out_offset, int *glyphs, int op)
{
    float line_height = row_height;
    struct nk_vec2 text_size = nk_vec2(0,0);
    float line_width = 0.0f;

    float glyph_width;
    int glyph_len = 0;
    nk_rune unicode = 0;
    int text_len = 0;
    if (!begin || byte_len <= 0 || !font)
        return nk_vec2(0,row_height);

    glyph_len = nk_utf_decode(begin, &unicode, byte_len);
    if (!glyph_len) return text_size;
    glyph_width = font->width(font->userdata, font->height, begin, glyph_len);

    *glyphs = 0;
    while ((text_len < byte_len) && glyph_len) {
        if (unicode == '\n') {
            text_size.x = NK_MAX(text_size.x, line_width);
            text_size.y += line_height;
            line_width = 0;
            *glyphs+=1;
            if (op == NK_STOP_ON_NEW_LINE)
                break;

            text_len++;
            glyph_len = nk_utf_decode(begin + text_len, &unicode, byte_len-text_len);
            continue;
        }

        if (unicode == '\r') {
            text_len++;
            *glyphs+=1;
            glyph_len = nk_utf_decode(begin + text_len, &unicode, byte_len-text_len);
            continue;
        }

        *glyphs = *glyphs + 1;
        text_len += glyph_len;
        line_width += (float)glyph_width;
        glyph_width = font->width(font->userdata, font->height, begin+text_len, glyph_len);
        glyph_len = nk_utf_decode(begin + text_len, &unicode, byte_len-text_len);
        continue;
    }

    if (text_size.x < line_width)
        text_size.x = line_width;
    if (out_offset)
        *out_offset = nk_vec2(line_width, text_size.y + line_height);
    if (line_width > 0 || text_size.y == 0.0f)
        text_size.y += line_height;
    if (remaining)
        *remaining = begin+text_len;
    return text_size;
}

/* ==============================================================
 *
 *                          UTF-8
 *
 * ===============================================================*/

NK_GLOBAL const nk_byte nk_utfbyte[NK_UTF_SIZE+1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
NK_GLOBAL const nk_byte nk_utfmask[NK_UTF_SIZE+1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
NK_GLOBAL const nk_uint nk_utfmin[NK_UTF_SIZE+1] = {0, 0, 0x80, 0x800, 0x10000};
NK_GLOBAL const nk_uint nk_utfmax[NK_UTF_SIZE+1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};

NK_INTERN int
nk_utf_validate(nk_rune *u, int i)
{
    NK_ASSERT(u);
    if (!u) return 0;
    if (!NK_BETWEEN(*u, nk_utfmin[i], nk_utfmax[i]) ||
         NK_BETWEEN(*u, 0xD800, 0xDFFF))
            *u = NK_UTF_INVALID;
    for (i = 1; *u > nk_utfmax[i]; ++i);
    return i;
}

NK_INTERN nk_rune
nk_utf_decode_byte(char c, int *i)
{
    NK_ASSERT(i);
    if (!i) return 0;
    for(*i = 0; *i < (int)NK_LEN(nk_utfmask); ++(*i)) {
        if (((nk_byte)c & nk_utfmask[*i]) == nk_utfbyte[*i])
            return (nk_byte)(c & ~nk_utfmask[*i]);
    }
    return 0;
}

NK_API int
nk_utf_decode(const char *c, nk_rune *u, int clen)
{
    int i, j, len, type=0;
    nk_rune udecoded;

    NK_ASSERT(c);
    NK_ASSERT(u);

    if (!c || !u) return 0;
    if (!clen) return 0;
    *u = NK_UTF_INVALID;

    udecoded = nk_utf_decode_byte(c[0], &len);
    if (!NK_BETWEEN(len, 1, NK_UTF_SIZE))
        return 1;

    for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
        udecoded = (udecoded << 6) | nk_utf_decode_byte(c[i], &type);
        if (type != 0)
            return j;
    }
    if (j < len)
        return 0;
    *u = udecoded;
    nk_utf_validate(u, len);
    return len;
}

NK_INTERN char
nk_utf_encode_byte(nk_rune u, int i)
{
    return (char)((nk_utfbyte[i]) | ((nk_byte)u & ~nk_utfmask[i]));
}

NK_API int
nk_utf_encode(nk_rune u, char *c, int clen)
{
    int len, i;
    len = nk_utf_validate(&u, 0);
    if (clen < len || !len || len > NK_UTF_SIZE)
        return 0;

    for (i = len - 1; i != 0; --i) {
        c[i] = nk_utf_encode_byte(u, 0);
        u >>= 6;
    }
    c[0] = nk_utf_encode_byte(u, len);
    return len;
}

NK_API int
nk_utf_len(const char *str, int len)
{
    const char *text;
    int glyphs = 0;
    int text_len;
    int glyph_len;
    int src_len = 0;
    nk_rune unicode;

    NK_ASSERT(str);
    if (!str || !len) return 0;

    text = str;
    text_len = len;
    glyph_len = nk_utf_decode(text, &unicode, text_len);
    while (glyph_len && src_len < len) {
        glyphs++;
        src_len = src_len + glyph_len;
        glyph_len = nk_utf_decode(text + src_len, &unicode, text_len - src_len);
    }
    return glyphs;
}

NK_API const char*
nk_utf_at(const char *buffer, int length, int index,
    nk_rune *unicode, int *len)
{
    int i = 0;
    int src_len = 0;
    int glyph_len = 0;
    const char *text;
    int text_len;

    NK_ASSERT(buffer);
    NK_ASSERT(unicode);
    NK_ASSERT(len);

    if (!buffer || !unicode || !len) return 0;
    if (index < 0) {
        *unicode = NK_UTF_INVALID;
        *len = 0;
        return 0;
    }

    text = buffer;
    text_len = length;
    glyph_len = nk_utf_decode(text, unicode, text_len);
    while (glyph_len) {
        if (i == index) {
            *len = glyph_len;
            break;
        }

        i++;
        src_len = src_len + glyph_len;
        glyph_len = nk_utf_decode(text + src_len, unicode, text_len - src_len);
    }
    if (i != index) return 0;
    return buffer + src_len;
}

/* ==============================================================
 *
 *                          BUFFER
 *
 * ===============================================================*/

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_INTERN void* nk_malloc(nk_handle unused, void *old,nk_size size)
{NK_UNUSED(unused); NK_UNUSED(old); return malloc(size);}
NK_INTERN void nk_mfree(nk_handle unused, void *ptr)
{NK_UNUSED(unused); free(ptr);}

NK_API void
nk_buffer_init_default(struct nk_buffer *buffer)
{
    struct nk_allocator alloc;
    alloc.userdata.ptr = 0;
    alloc.alloc = nk_malloc;
    alloc.free = nk_mfree;
    nk_buffer_init(buffer, &alloc, NK_BUFFER_DEFAULT_INITIAL_SIZE);
}
#endif

NK_API void
nk_buffer_init(struct nk_buffer *b, const struct nk_allocator *a,
    nk_size initial_size)
{
    NK_ASSERT(b);
    NK_ASSERT(a);
    NK_ASSERT(initial_size);
    if (!b || !a || !initial_size) return;

    nk_zero(b, sizeof(*b));
    b->type = NK_BUFFER_DYNAMIC;
    b->memory.ptr = a->alloc(a->userdata,0, initial_size);
    b->memory.size = initial_size;
    b->size = initial_size;
    b->grow_factor = 2.0f;
    b->pool = *a;
}

NK_API void
nk_buffer_init_fixed(struct nk_buffer *b, void *m, nk_size size)
{
    NK_ASSERT(b);
    NK_ASSERT(m);
    NK_ASSERT(size);
    if (!b || !m || !size) return;

    nk_zero(b, sizeof(*b));
    b->type = NK_BUFFER_FIXED;
    b->memory.ptr = m;
    b->memory.size = size;
    b->size = size;
}

NK_INTERN void*
nk_buffer_align(void *unaligned, nk_size align, nk_size *alignment,
    enum nk_buffer_allocation_type type)
{
    void *memory = 0;
    switch (type) {
    default:
    case NK_BUFFER_MAX:
    case NK_BUFFER_FRONT:
        if (align) {
            memory = NK_ALIGN_PTR(unaligned, align);
            *alignment = (nk_size)((nk_byte*)memory - (nk_byte*)unaligned);
        } else {
            memory = unaligned;
            *alignment = 0;
        }
        break;
    case NK_BUFFER_BACK:
        if (align) {
            memory = NK_ALIGN_PTR_BACK(unaligned, align);
            *alignment = (nk_size)((nk_byte*)unaligned - (nk_byte*)memory);
        } else {
            memory = unaligned;
            *alignment = 0;
        }
        break;
    }
    return memory;
}

NK_INTERN void*
nk_buffer_realloc(struct nk_buffer *b, nk_size capacity, nk_size *size)
{
    void *temp;
    nk_size buffer_size;

    NK_ASSERT(b);
    NK_ASSERT(size);
    if (!b || !size || !b->pool.alloc || !b->pool.free)
        return 0;

    buffer_size = b->memory.size;
    temp = b->pool.alloc(b->pool.userdata, b->memory.ptr, capacity);
    NK_ASSERT(temp);
    if (!temp) return 0;

    *size = capacity;
    if (temp != b->memory.ptr) {
        NK_MEMCPY(temp, b->memory.ptr, buffer_size);
        b->pool.free(b->pool.userdata, b->memory.ptr);
    }

    if (b->size == buffer_size) {
        /* no back buffer so just set correct size */
        b->size = capacity;
        return temp;
    } else {
        /* copy back buffer to the end of the new buffer */
        void *dst, *src;
        nk_size back_size;
        back_size = buffer_size - b->size;
        dst = nk_ptr_add(void, temp, capacity - back_size);
        src = nk_ptr_add(void, temp, b->size);
        NK_MEMCPY(dst, src, back_size);
        b->size = capacity - back_size;
    }
    return temp;
}

NK_INTERN void*
nk_buffer_alloc(struct nk_buffer *b, enum nk_buffer_allocation_type type,
    nk_size size, nk_size align)
{
    int full;
    nk_size alignment;
    void *unaligned;
    void *memory;

    NK_ASSERT(b);
    NK_ASSERT(size);
    if (!b || !size) return 0;
    b->needed += size;

    /* calculate total size with needed alignment + size */
    if (type == NK_BUFFER_FRONT)
        unaligned = nk_ptr_add(void, b->memory.ptr, b->allocated);
    else unaligned = nk_ptr_add(void, b->memory.ptr, b->size - size);
    memory = nk_buffer_align(unaligned, align, &alignment, type);

    /* check if buffer has enough memory*/
    if (type == NK_BUFFER_FRONT)
        full = ((b->allocated + size + alignment) > b->size);
    else full = ((b->size - (size + alignment)) <= b->allocated);

    if (full) {
        nk_size capacity;
        NK_ASSERT(b->type == NK_BUFFER_DYNAMIC);
        NK_ASSERT(b->pool.alloc && b->pool.free);
        if (b->type != NK_BUFFER_DYNAMIC || !b->pool.alloc || !b->pool.free)
            return 0;

        /* buffer is full so allocate bigger buffer if dynamic */
        capacity = (nk_size)((float)b->memory.size * b->grow_factor);
        capacity = NK_MAX(capacity, nk_round_up_pow2((nk_uint)(b->allocated + size)));
        b->memory.ptr = nk_buffer_realloc(b, capacity, &b->memory.size);
        if (!b->memory.ptr) return 0;

        /* align newly allocated pointer */
        if (type == NK_BUFFER_FRONT)
            unaligned = nk_ptr_add(void, b->memory.ptr, b->allocated);
        else unaligned = nk_ptr_add(void, b->memory.ptr, b->size);
        memory = nk_buffer_align(unaligned, align, &alignment, type);
    }

    if (type == NK_BUFFER_FRONT)
        b->allocated += size + alignment;
    else b->size -= (size + alignment);
    b->needed += alignment;
    b->calls++;
    return memory;
}

NK_API void
nk_buffer_push(struct nk_buffer *b, enum nk_buffer_allocation_type type,
    void *memory, nk_size size, nk_size align)
{
    void *mem = nk_buffer_alloc(b, type, size, align);
    if (!mem) return;
    NK_MEMCPY(mem, memory, size);
}

NK_API void
nk_buffer_mark(struct nk_buffer *buffer, enum nk_buffer_allocation_type type)
{
    NK_ASSERT(buffer);
    if (!buffer) return;
    buffer->marker[type].active = nk_true;
    if (type == NK_BUFFER_BACK)
        buffer->marker[type].offset = buffer->size;
    else buffer->marker[type].offset = buffer->allocated;
}

NK_API void
nk_buffer_reset(struct nk_buffer *buffer, enum nk_buffer_allocation_type type)
{
    NK_ASSERT(buffer);
    if (!buffer) return;
    if (type == NK_BUFFER_BACK) {
        /* reset back buffer either back to marker or empty */
        buffer->needed -= (buffer->memory.size - buffer->marker[type].offset);
        if (buffer->marker[type].active)
            buffer->size = buffer->marker[type].offset;
        else buffer->size = buffer->memory.size;
        buffer->marker[type].active = nk_false;
    } else {
        /* reset front buffer either back to back marker or empty */
        buffer->needed -= (buffer->allocated - buffer->marker[type].offset);
        if (buffer->marker[type].active)
            buffer->allocated = buffer->marker[type].offset;
        else buffer->allocated = 0;
        buffer->marker[type].active = nk_false;
    }
}

NK_API void
nk_buffer_clear(struct nk_buffer *b)
{
    NK_ASSERT(b);
    if (!b) return;
    b->allocated = 0;
    b->size = b->memory.size;
    b->calls = 0;
    b->needed = 0;
}

NK_API void
nk_buffer_free(struct nk_buffer *b)
{
    NK_ASSERT(b);
    if (!b || !b->memory.ptr) return;
    if (b->type == NK_BUFFER_FIXED) return;
    if (!b->pool.free) return;
    NK_ASSERT(b->pool.free);
    b->pool.free(b->pool.userdata, b->memory.ptr);
}

NK_API void
nk_buffer_info(struct nk_memory_status *s, struct nk_buffer *b)
{
    NK_ASSERT(b);
    NK_ASSERT(s);
    if (!s || !b) return;
    s->allocated = b->allocated;
    s->size =  b->memory.size;
    s->needed = b->needed;
    s->memory = b->memory.ptr;
    s->calls = b->calls;
}

NK_API void*
nk_buffer_memory(struct nk_buffer *buffer)
{
    NK_ASSERT(buffer);
    if (!buffer) return 0;
    return buffer->memory.ptr;
}

NK_API const void*
nk_buffer_memory_const(const struct nk_buffer *buffer)
{
    NK_ASSERT(buffer);
    if (!buffer) return 0;
    return buffer->memory.ptr;
}

NK_API nk_size
nk_buffer_total(struct nk_buffer *buffer)
{
    NK_ASSERT(buffer);
    if (!buffer) return 0;
    return buffer->memory.size;
}

/*
 * ==============================================================
 *
 *                          STRING
 *
 * ===============================================================
 */

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void
nk_str_init_default(struct nk_str *str)
{
    struct nk_allocator alloc;
    alloc.userdata.ptr = 0;
    alloc.alloc = nk_malloc;
    alloc.free = nk_mfree;
    nk_buffer_init(&str->buffer, &alloc, 32);
    str->len = 0;
}
#endif

NK_API void
nk_str_init(struct nk_str *str, const struct nk_allocator *alloc, nk_size size)
{
    nk_buffer_init(&str->buffer, alloc, size);
    str->len = 0;
}

NK_API void
nk_str_init_fixed(struct nk_str *str, void *memory, nk_size size)
{
    nk_buffer_init_fixed(&str->buffer, memory, size);
    str->len = 0;
}

NK_API int
nk_str_append_text_char(struct nk_str *s, const char *str, int len)
{
    char *mem;
    NK_ASSERT(s);
    NK_ASSERT(str);
    if (!s || !str || !len) return 0;
    mem = (char*)nk_buffer_alloc(&s->buffer, NK_BUFFER_FRONT, (nk_size)len * sizeof(char), 0);
    if (!mem) return 0;
    NK_MEMCPY(mem, str, (nk_size)len * sizeof(char));
    s->len += nk_utf_len(str, len);
    return len;
}

NK_API int
nk_str_append_str_char(struct nk_str *s, const char *str)
{
    return nk_str_append_text_char(s, str, nk_strlen(str));
}

NK_API int
nk_str_append_text_utf8(struct nk_str *str, const char *text, int len)
{
    int i = 0;
    int byte_len = 0;
    nk_rune unicode;
    if (!str || !text || !len) return 0;
    for (i = 0; i < len; ++i)
        byte_len += nk_utf_decode(text+byte_len, &unicode, 4);
    nk_str_append_text_char(str, text, byte_len);
    return len;
}

NK_API int
nk_str_append_str_utf8(struct nk_str *str, const char *text)
{
    int runes = 0;
    int byte_len = 0;
    int num_runes = 0;
    int glyph_len = 0;
    nk_rune unicode;
    if (!str || !text) return 0;

    glyph_len = byte_len = nk_utf_decode(text+byte_len, &unicode, 4);
    while (unicode != '\0' && glyph_len) {
        glyph_len = nk_utf_decode(text+byte_len, &unicode, 4);
        byte_len += glyph_len;
        num_runes++;
    }
    nk_str_append_text_char(str, text, byte_len);
    return runes;
}

NK_API int
nk_str_append_text_runes(struct nk_str *str, const nk_rune *text, int len)
{
    int i = 0;
    int byte_len = 0;
    nk_glyph glyph;

    NK_ASSERT(str);
    if (!str || !text || !len) return 0;
    for (i = 0; i < len; ++i) {
        byte_len = nk_utf_encode(text[i], glyph, NK_UTF_SIZE);
        if (!byte_len) break;
        nk_str_append_text_char(str, glyph, byte_len);
    }
    return len;
}

NK_API int
nk_str_append_str_runes(struct nk_str *str, const nk_rune *runes)
{
    int i = 0;
    nk_glyph glyph;
    int byte_len;
    NK_ASSERT(str);
    if (!str || !runes) return 0;
    while (runes[i] != '\0') {
        byte_len = nk_utf_encode(runes[i], glyph, NK_UTF_SIZE);
        nk_str_append_text_char(str, glyph, byte_len);
        i++;
    }
    return i;
}

NK_API int
nk_str_insert_at_char(struct nk_str *s, int pos, const char *str, int len)
{
    int i;
    void *mem;
    char *src;
    char *dst;

    int copylen;
    NK_ASSERT(s);
    NK_ASSERT(str);
    NK_ASSERT(len >= 0);
    if (!s || !str || !len || (nk_size)pos > s->buffer.allocated) return 0;
    if ((s->buffer.allocated + (nk_size)len >= s->buffer.memory.size) &&
        (s->buffer.type == NK_BUFFER_FIXED)) return 0;

    copylen = (int)s->buffer.allocated - pos;
    if (!copylen) {
        nk_str_append_text_char(s, str, len);
        return 1;
    }
    mem = nk_buffer_alloc(&s->buffer, NK_BUFFER_FRONT, (nk_size)len * sizeof(char), 0);
    if (!mem) return 0;

    /* memmove */
    NK_ASSERT(((int)pos + (int)len + ((int)copylen - 1)) >= 0);
    NK_ASSERT(((int)pos + ((int)copylen - 1)) >= 0);
    dst = nk_ptr_add(char, s->buffer.memory.ptr, pos + len + (copylen - 1));
    src = nk_ptr_add(char, s->buffer.memory.ptr, pos + (copylen-1));
    for (i = 0; i < copylen; ++i) *dst-- = *src--;
    mem = nk_ptr_add(void, s->buffer.memory.ptr, pos);
    NK_MEMCPY(mem, str, (nk_size)len * sizeof(char));
    s->len = nk_utf_len((char *)s->buffer.memory.ptr, (int)s->buffer.allocated);
    return 1;
}

NK_API int
nk_str_insert_at_rune(struct nk_str *str, int pos, const char *cstr, int len)
{
    int glyph_len;
    nk_rune unicode;
    const char *begin;
    const char *buffer;

    NK_ASSERT(str);
    NK_ASSERT(cstr);
    NK_ASSERT(len);
    if (!str || !cstr || !len) return 0;
    begin = nk_str_at_rune(str, pos, &unicode, &glyph_len);
    buffer = nk_str_get_const(str);
    if (!begin) return 0;
    return nk_str_insert_text_char(str, (int)(begin - buffer), cstr, len);
}

NK_API int nk_str_insert_text_char(struct nk_str *str, int pos, const char *text, int len)
{return nk_str_insert_at_char(str, pos, text, len);}

NK_API int nk_str_insert_str_char(struct nk_str *str, int pos, const char *text)
{return nk_str_insert_at_char(str, pos, text, nk_strlen(text));}

NK_API int
nk_str_insert_text_utf8(struct nk_str *str, int pos, const char *text, int len)
{
    int i = 0;
    int byte_len = 0;
    nk_rune unicode;

    NK_ASSERT(str);
    NK_ASSERT(text);
    if (!str || !text || !len) return 0;
    for (i = 0; i < len; ++i)
        byte_len += nk_utf_decode(text+byte_len, &unicode, 4);
    nk_str_insert_at_rune(str, pos, text, byte_len);
    return len;
}

NK_API int
nk_str_insert_str_utf8(struct nk_str *str, int pos, const char *text)
{
    int runes = 0;
    int byte_len = 0;
    int num_runes = 0;
    int glyph_len = 0;
    nk_rune unicode;
    if (!str || !text) return 0;

    glyph_len = byte_len = nk_utf_decode(text+byte_len, &unicode, 4);
    while (unicode != '\0' && glyph_len) {
        glyph_len = nk_utf_decode(text+byte_len, &unicode, 4);
        byte_len += glyph_len;
        num_runes++;
    }
    nk_str_insert_at_rune(str, pos, text, byte_len);
    return runes;
}

NK_API int
nk_str_insert_text_runes(struct nk_str *str, int pos, const nk_rune *runes, int len)
{
    int i = 0;
    int byte_len = 0;
    nk_glyph glyph;

    NK_ASSERT(str);
    if (!str || !runes || !len) return 0;
    for (i = 0; i < len; ++i) {
        byte_len = nk_utf_encode(runes[i], glyph, NK_UTF_SIZE);
        if (!byte_len) break;
        nk_str_insert_at_rune(str, pos+i, glyph, byte_len);
    }
    return len;
}

NK_API int
nk_str_insert_str_runes(struct nk_str *str, int pos, const nk_rune *runes)
{
    int i = 0;
    nk_glyph glyph;
    int byte_len;
    NK_ASSERT(str);
    if (!str || !runes) return 0;
    while (runes[i] != '\0') {
        byte_len = nk_utf_encode(runes[i], glyph, NK_UTF_SIZE);
        nk_str_insert_at_rune(str, pos+i, glyph, byte_len);
        i++;
    }
    return i;
}

NK_API void
nk_str_remove_chars(struct nk_str *s, int len)
{
    NK_ASSERT(s);
    NK_ASSERT(len >= 0);
    if (!s || len < 0 || (nk_size)len > s->buffer.allocated) return;
    NK_ASSERT(((int)s->buffer.allocated - (int)len) >= 0);
    s->buffer.allocated -= (nk_size)len;
    s->len = nk_utf_len((char *)s->buffer.memory.ptr, (int)s->buffer.allocated);
}

NK_API void
nk_str_remove_runes(struct nk_str *str, int len)
{
    int index;
    const char *begin;
    const char *end;
    nk_rune unicode;

    NK_ASSERT(str);
    NK_ASSERT(len >= 0);
    if (!str || len < 0) return;
    if (len >= str->len) {
        str->len = 0;
        return;
    }

    index = str->len - len;
    begin = nk_str_at_rune(str, index, &unicode, &len);
    end = (const char*)str->buffer.memory.ptr + str->buffer.allocated;
    nk_str_remove_chars(str, (int)(end-begin)+1);
}

NK_API void
nk_str_delete_chars(struct nk_str *s, int pos, int len)
{
    NK_ASSERT(s);
    if (!s || !len || (nk_size)pos > s->buffer.allocated ||
        (nk_size)(pos + len) > s->buffer.allocated) return;

    if ((nk_size)(pos + len) < s->buffer.allocated) {
        /* memmove */
        char *dst = nk_ptr_add(char, s->buffer.memory.ptr, pos);
        char *src = nk_ptr_add(char, s->buffer.memory.ptr, pos + len);
        NK_MEMCPY(dst, src, s->buffer.allocated - (nk_size)(pos + len));
        NK_ASSERT(((int)s->buffer.allocated - (int)len) >= 0);
        s->buffer.allocated -= (nk_size)len;
    } else nk_str_remove_chars(s, len);
    s->len = nk_utf_len((char *)s->buffer.memory.ptr, (int)s->buffer.allocated);
}

NK_API void
nk_str_delete_runes(struct nk_str *s, int pos, int len)
{
    char *temp;
    nk_rune unicode;
    char *begin;
    char *end;
    int unused;

    NK_ASSERT(s);
    NK_ASSERT(s->len >= pos + len);
    if (s->len < pos + len)
        len = NK_CLAMP(0, (s->len - pos), s->len);
    if (!len) return;

    temp = (char *)s->buffer.memory.ptr;
    begin = nk_str_at_rune(s, pos, &unicode, &unused);
    if (!begin) return;
    s->buffer.memory.ptr = begin;
    end = nk_str_at_rune(s, len, &unicode, &unused);
    s->buffer.memory.ptr = temp;
    if (!end) return;
    nk_str_delete_chars(s, (int)(begin - temp), (int)(end - begin));
}

NK_API char*
nk_str_at_char(struct nk_str *s, int pos)
{
    NK_ASSERT(s);
    if (!s || pos > (int)s->buffer.allocated) return 0;
    return nk_ptr_add(char, s->buffer.memory.ptr, pos);
}

NK_API char*
nk_str_at_rune(struct nk_str *str, int pos, nk_rune *unicode, int *len)
{
    int i = 0;
    int src_len = 0;
    int glyph_len = 0;
    char *text;
    int text_len;

    NK_ASSERT(str);
    NK_ASSERT(unicode);
    NK_ASSERT(len);

    if (!str || !unicode || !len) return 0;
    if (pos < 0) {
        *unicode = 0;
        *len = 0;
        return 0;
    }

    text = (char*)str->buffer.memory.ptr;
    text_len = (int)str->buffer.allocated;
    glyph_len = nk_utf_decode(text, unicode, text_len);
    while (glyph_len) {
        if (i == pos) {
            *len = glyph_len;
            break;
        }

        i+= glyph_len;
        src_len = src_len + glyph_len;
        glyph_len = nk_utf_decode(text + src_len, unicode, text_len - src_len);
    }
    if (i != pos) return 0;
    return text + src_len;
}

NK_API const char*
nk_str_at_char_const(const struct nk_str *s, int pos)
{
    NK_ASSERT(s);
    if (!s || pos > (int)s->buffer.allocated) return 0;
    return nk_ptr_add(char, s->buffer.memory.ptr, pos);
}

NK_API const char*
nk_str_at_const(const struct nk_str *str, int pos, nk_rune *unicode, int *len)
{
    int i = 0;
    int src_len = 0;
    int glyph_len = 0;
    char *text;
    int text_len;

    NK_ASSERT(str);
    NK_ASSERT(unicode);
    NK_ASSERT(len);

    if (!str || !unicode || !len) return 0;
    if (pos < 0) {
        *unicode = 0;
        *len = 0;
        return 0;
    }

    text = (char*)str->buffer.memory.ptr;
    text_len = (int)str->buffer.allocated;
    glyph_len = nk_utf_decode(text, unicode, text_len);
    while (glyph_len) {
        if (i == pos) {
            *len = glyph_len;
            break;
        }

        i++;
        src_len = src_len + glyph_len;
        glyph_len = nk_utf_decode(text + src_len, unicode, text_len - src_len);
    }
    if (i != pos) return 0;
    return text + src_len;
}

NK_API nk_rune
nk_str_rune_at(const struct nk_str *str, int pos)
{
    int len;
    nk_rune unicode = 0;
    nk_str_at_const(str, pos, &unicode, &len);
    return unicode;
}

NK_API char*
nk_str_get(struct nk_str *s)
{
    NK_ASSERT(s);
    if (!s || !s->len || !s->buffer.allocated) return 0;
    return (char*)s->buffer.memory.ptr;
}

NK_API const char*
nk_str_get_const(const struct nk_str *s)
{
    NK_ASSERT(s);
    if (!s || !s->len || !s->buffer.allocated) return 0;
    return (const char*)s->buffer.memory.ptr;
}

NK_API int
nk_str_len(struct nk_str *s)
{
    NK_ASSERT(s);
    if (!s || !s->len || !s->buffer.allocated) return 0;
    return s->len;
}

NK_API int
nk_str_len_char(struct nk_str *s)
{
    NK_ASSERT(s);
    if (!s || !s->len || !s->buffer.allocated) return 0;
    return (int)s->buffer.allocated;
}

NK_API void
nk_str_clear(struct nk_str *str)
{
    NK_ASSERT(str);
    nk_buffer_clear(&str->buffer);
    str->len = 0;
}

NK_API void
nk_str_free(struct nk_str *str)
{
    NK_ASSERT(str);
    nk_buffer_free(&str->buffer);
    str->len = 0;
}

/*
 * ==============================================================
 *
 *                      Command buffer
 *
 * ===============================================================
*/

NK_INTERN void
nk_command_buffer_init(struct nk_command_buffer *cmdbuf,
    struct nk_buffer *buffer, enum nk_command_clipping clip)
{
    NK_ASSERT(cmdbuf);
    NK_ASSERT(buffer);
    if (!cmdbuf || !buffer) return;
    cmdbuf->base = buffer;
    cmdbuf->use_clipping = clip;
    cmdbuf->begin = buffer->allocated;
    cmdbuf->end = buffer->allocated;
    cmdbuf->last = buffer->allocated;
}

NK_INTERN void
nk_command_buffer_reset(struct nk_command_buffer *buffer)
{
    NK_ASSERT(buffer);
    if (!buffer) return;
    buffer->begin = 0;
    buffer->end = 0;
    buffer->last = 0;
    buffer->clip = nk_null_rect;
#ifdef NK_INCLUDE_COMMAND_USERDATA
    buffer->userdata.ptr = 0;
#endif
}

NK_INTERN void*
nk_command_buffer_push(struct nk_command_buffer* b,
    enum nk_command_type t, nk_size size)
{
    NK_STORAGE const nk_size align = NK_ALIGNOF(struct nk_command);
    struct nk_command *cmd;
    nk_size alignment;
    void *unaligned;
    void *memory;

    NK_ASSERT(b);
    NK_ASSERT(b->base);
    if (!b) return 0;

    cmd = (struct nk_command*)nk_buffer_alloc(b->base,NK_BUFFER_FRONT,size,align);
    if (!cmd) return 0;

    /* make sure the offset to the next command is aligned */
    b->last = (nk_size)((nk_byte*)cmd - (nk_byte*)b->base->memory.ptr);
    unaligned = (nk_byte*)cmd + size;
    memory = NK_ALIGN_PTR(unaligned, align);
    alignment = (nk_size)((nk_byte*)memory - (nk_byte*)unaligned);

    cmd->type = t;
    cmd->next = b->base->allocated + alignment;
#ifdef NK_INCLUDE_COMMAND_USERDATA
    cmd->userdata = b->userdata;
#endif
    b->end = cmd->next;
    return cmd;
}

NK_API void
nk_push_scissor(struct nk_command_buffer *b, struct nk_rect r)
{
    struct nk_command_scissor *cmd;
    NK_ASSERT(b);
    if (!b) return;

    b->clip.x = r.x;
    b->clip.y = r.y;
    b->clip.w = r.w;
    b->clip.h = r.h;
    cmd = (struct nk_command_scissor*)
        nk_command_buffer_push(b, NK_COMMAND_SCISSOR, sizeof(*cmd));

    if (!cmd) return;
    cmd->x = (short)r.x;
    cmd->y = (short)r.y;
    cmd->w = (unsigned short)NK_MAX(0, r.w);
    cmd->h = (unsigned short)NK_MAX(0, r.h);
}

NK_API void
nk_stroke_line(struct nk_command_buffer *b, float x0, float y0,
    float x1, float y1, float line_thickness, struct nk_color c)
{
    struct nk_command_line *cmd;
    NK_ASSERT(b);
    if (!b) return;
    cmd = (struct nk_command_line*)
        nk_command_buffer_push(b, NK_COMMAND_LINE, sizeof(*cmd));
    if (!cmd) return;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->begin.x = (short)x0;
    cmd->begin.y = (short)y0;
    cmd->end.x = (short)x1;
    cmd->end.y = (short)y1;
    cmd->color = c;
}

NK_API void
nk_stroke_curve(struct nk_command_buffer *b, float ax, float ay,
    float ctrl0x, float ctrl0y, float ctrl1x, float ctrl1y,
    float bx, float by, float line_thickness, struct nk_color col)
{
    struct nk_command_curve *cmd;
    NK_ASSERT(b);
    if (!b || col.a == 0) return;

    cmd = (struct nk_command_curve*)
        nk_command_buffer_push(b, NK_COMMAND_CURVE, sizeof(*cmd));
    if (!cmd) return;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->begin.x = (short)ax;
    cmd->begin.y = (short)ay;
    cmd->ctrl[0].x = (short)ctrl0x;
    cmd->ctrl[0].y = (short)ctrl0y;
    cmd->ctrl[1].x = (short)ctrl1x;
    cmd->ctrl[1].y = (short)ctrl1y;
    cmd->end.x = (short)bx;
    cmd->end.y = (short)by;
    cmd->color = col;
}

NK_API void
nk_stroke_rect(struct nk_command_buffer *b, struct nk_rect rect,
    float rounding, float line_thickness, struct nk_color c)
{
    struct nk_command_rect *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INTERSECT(rect.x, rect.y, rect.w, rect.h,
            clip->x, clip->y, clip->w, clip->h)) return;
    }

    cmd = (struct nk_command_rect*)
        nk_command_buffer_push(b, NK_COMMAND_RECT, sizeof(*cmd));
    if (!cmd) return;
    cmd->rounding = (unsigned short)rounding;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->x = (short)rect.x;
    cmd->y = (short)rect.y;
    cmd->w = (unsigned short)NK_MAX(0, rect.w);
    cmd->h = (unsigned short)NK_MAX(0, rect.h);
    cmd->color = c;
}

NK_API void
nk_fill_rect(struct nk_command_buffer *b, struct nk_rect rect,
    float rounding, struct nk_color c)
{
    struct nk_command_rect_filled *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INTERSECT(rect.x, rect.y, rect.w, rect.h,
            clip->x, clip->y, clip->w, clip->h)) return;
    }

    cmd = (struct nk_command_rect_filled*)
        nk_command_buffer_push(b, NK_COMMAND_RECT_FILLED, sizeof(*cmd));
    if (!cmd) return;
    cmd->rounding = (unsigned short)rounding;
    cmd->x = (short)rect.x;
    cmd->y = (short)rect.y;
    cmd->w = (unsigned short)NK_MAX(0, rect.w);
    cmd->h = (unsigned short)NK_MAX(0, rect.h);
    cmd->color = c;
}

NK_API void
nk_fill_rect_multi_color(struct nk_command_buffer *b, struct nk_rect rect,
    struct nk_color left, struct nk_color top, struct nk_color right,
    struct nk_color bottom)
{
    struct nk_command_rect_multi_color *cmd;
    NK_ASSERT(b);
    if (!b) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INTERSECT(rect.x, rect.y, rect.w, rect.h,
            clip->x, clip->y, clip->w, clip->h)) return;
    }

    cmd = (struct nk_command_rect_multi_color*)
        nk_command_buffer_push(b, NK_COMMAND_RECT_MULTI_COLOR, sizeof(*cmd));
    if (!cmd) return;
    cmd->x = (short)rect.x;
    cmd->y = (short)rect.y;
    cmd->w = (unsigned short)NK_MAX(0, rect.w);
    cmd->h = (unsigned short)NK_MAX(0, rect.h);
    cmd->left = left;
    cmd->top = top;
    cmd->right = right;
    cmd->bottom = bottom;
}

NK_API void
nk_stroke_circle(struct nk_command_buffer *b, struct nk_rect r,
    float line_thickness, struct nk_color c)
{
    struct nk_command_circle *cmd;
    if (!b || c.a == 0) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INTERSECT(r.x, r.y, r.w, r.h, clip->x, clip->y, clip->w, clip->h))
            return;
    }

    cmd = (struct nk_command_circle*)
        nk_command_buffer_push(b, NK_COMMAND_CIRCLE, sizeof(*cmd));
    if (!cmd) return;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->x = (short)r.x;
    cmd->y = (short)r.y;
    cmd->w = (unsigned short)NK_MAX(r.w, 0);
    cmd->h = (unsigned short)NK_MAX(r.h, 0);
    cmd->color = c;
}

NK_API void
nk_fill_circle(struct nk_command_buffer *b, struct nk_rect r, struct nk_color c)
{
    struct nk_command_circle_filled *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INTERSECT(r.x, r.y, r.w, r.h, clip->x, clip->y, clip->w, clip->h))
            return;
    }

    cmd = (struct nk_command_circle_filled*)
        nk_command_buffer_push(b, NK_COMMAND_CIRCLE_FILLED, sizeof(*cmd));
    if (!cmd) return;
    cmd->x = (short)r.x;
    cmd->y = (short)r.y;
    cmd->w = (unsigned short)NK_MAX(r.w, 0);
    cmd->h = (unsigned short)NK_MAX(r.h, 0);
    cmd->color = c;
}

NK_API void
nk_stroke_arc(struct nk_command_buffer *b, float cx, float cy, float radius,
    float a_min, float a_max, float line_thickness, struct nk_color c)
{
    struct nk_command_arc *cmd;
    if (!b || c.a == 0) return;
    cmd = (struct nk_command_arc*)
        nk_command_buffer_push(b, NK_COMMAND_ARC, sizeof(*cmd));
    if (!cmd) return;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->cx = (short)cx;
    cmd->cy = (short)cy;
    cmd->r = (unsigned short)radius;
    cmd->a[0] = a_min;
    cmd->a[1] = a_max;
    cmd->color = c;
}

NK_API void
nk_fill_arc(struct nk_command_buffer *b, float cx, float cy, float radius,
    float a_min, float a_max, struct nk_color c)
{
    struct nk_command_arc_filled *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0) return;
    cmd = (struct nk_command_arc_filled*)
        nk_command_buffer_push(b, NK_COMMAND_ARC_FILLED, sizeof(*cmd));
    if (!cmd) return;
    cmd->cx = (short)cx;
    cmd->cy = (short)cy;
    cmd->r = (unsigned short)radius;
    cmd->a[0] = a_min;
    cmd->a[1] = a_max;
    cmd->color = c;
}

NK_API void
nk_stroke_triangle(struct nk_command_buffer *b, float x0, float y0, float x1,
    float y1, float x2, float y2, float line_thickness, struct nk_color c)
{
    struct nk_command_triangle *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INBOX(x0, y0, clip->x, clip->y, clip->w, clip->h) ||
            !NK_INBOX(x1, y1, clip->x, clip->y, clip->w, clip->h) ||
            !NK_INBOX(x2, y2, clip->x, clip->y, clip->w, clip->h))
            return;
    }

    cmd = (struct nk_command_triangle*)
        nk_command_buffer_push(b, NK_COMMAND_TRIANGLE, sizeof(*cmd));
    if (!cmd) return;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->a.x = (short)x0;
    cmd->a.y = (short)y0;
    cmd->b.x = (short)x1;
    cmd->b.y = (short)y1;
    cmd->c.x = (short)x2;
    cmd->c.y = (short)y2;
    cmd->color = c;
}

NK_API void
nk_fill_triangle(struct nk_command_buffer *b, float x0, float y0, float x1,
    float y1, float x2, float y2, struct nk_color c)
{
    struct nk_command_triangle_filled *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0) return;
    if (!b) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INBOX(x0, y0, clip->x, clip->y, clip->w, clip->h) ||
            !NK_INBOX(x1, y1, clip->x, clip->y, clip->w, clip->h) ||
            !NK_INBOX(x2, y2, clip->x, clip->y, clip->w, clip->h))
            return;
    }

    cmd = (struct nk_command_triangle_filled*)
        nk_command_buffer_push(b, NK_COMMAND_TRIANGLE_FILLED, sizeof(*cmd));
    if (!cmd) return;
    cmd->a.x = (short)x0;
    cmd->a.y = (short)y0;
    cmd->b.x = (short)x1;
    cmd->b.y = (short)y1;
    cmd->c.x = (short)x2;
    cmd->c.y = (short)y2;
    cmd->color = c;
}

NK_API void
nk_stroke_polygon(struct nk_command_buffer *b,  float *points, int point_count,
    float line_thickness, struct nk_color col)
{
    int i;
    nk_size size = 0;
    struct nk_command_polygon *cmd;

    NK_ASSERT(b);
    if (!b || col.a == 0) return;
    size = sizeof(*cmd) + sizeof(short) * 2 * (nk_size)point_count;
    cmd = (struct nk_command_polygon*) nk_command_buffer_push(b, NK_COMMAND_POLYGON, size);
    if (!cmd) return;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->color = col;
    cmd->point_count = (unsigned short)point_count;
    for (i = 0; i < point_count; ++i) {
        cmd->points[i].x = (short)points[i*2];
        cmd->points[i].y = (short)points[i*2+1];
    }
}

NK_API void
nk_fill_polygon(struct nk_command_buffer *b, float *points, int point_count,
    struct nk_color col)
{
    int i;
    nk_size size = 0;
    struct nk_command_polygon_filled *cmd;

    NK_ASSERT(b);
    if (!b || col.a == 0) return;
    size = sizeof(*cmd) + sizeof(short) * 2 * (nk_size)point_count;
    cmd = (struct nk_command_polygon_filled*)
        nk_command_buffer_push(b, NK_COMMAND_POLYGON_FILLED, size);
    if (!cmd) return;
    cmd->color = col;
    cmd->point_count = (unsigned short)point_count;
    for (i = 0; i < point_count; ++i) {
        cmd->points[i].x = (short)points[i*2];
        cmd->points[i].y = (short)points[i*2+1];
    }
}

NK_API void
nk_stroke_polyline(struct nk_command_buffer *b, float *points, int point_count,
    float line_thickness, struct nk_color col)
{
    int i;
    nk_size size = 0;
    struct nk_command_polyline *cmd;

    NK_ASSERT(b);
    if (!b || col.a == 0) return;
    size = sizeof(*cmd) + sizeof(short) * 2 * (nk_size)point_count;
    cmd = (struct nk_command_polyline*) nk_command_buffer_push(b, NK_COMMAND_POLYLINE, size);
    if (!cmd) return;
    cmd->color = col;
    cmd->point_count = (unsigned short)point_count;
    cmd->line_thickness = (unsigned short)line_thickness;
    for (i = 0; i < point_count; ++i) {
        cmd->points[i].x = (short)points[i*2];
        cmd->points[i].y = (short)points[i*2+1];
    }
}

NK_API void
nk_draw_image(struct nk_command_buffer *b, struct nk_rect r,
    const struct nk_image *img)
{
    struct nk_command_image *cmd;
    NK_ASSERT(b);
    if (!b) return;
    if (b->use_clipping) {
        const struct nk_rect *c = &b->clip;
        if (!NK_INTERSECT(r.x, r.y, r.w, r.h, c->x, c->y, c->w, c->h))
            return;
    }

    cmd = (struct nk_command_image*)
        nk_command_buffer_push(b, NK_COMMAND_IMAGE, sizeof(*cmd));
    if (!cmd) return;
    cmd->x = (short)r.x;
    cmd->y = (short)r.y;
    cmd->w = (unsigned short)NK_MAX(0, r.w);
    cmd->h = (unsigned short)NK_MAX(0, r.h);
    cmd->img = *img;
}

NK_API void
nk_draw_text(struct nk_command_buffer *b, struct nk_rect r,
    const char *string, int length, const struct nk_user_font *font,
    struct nk_color bg, struct nk_color fg)
{
    float text_width = 0;
    struct nk_command_text *cmd;

    NK_ASSERT(b);
    NK_ASSERT(font);
    if (!b || !string || !length || (bg.a == 0 && fg.a == 0)) return;
    if (b->use_clipping) {
        const struct nk_rect *c = &b->clip;
        if (!NK_INTERSECT(r.x, r.y, r.w, r.h, c->x, c->y, c->w, c->h))
            return;
    }

    /* make sure text fits inside bounds */
    text_width = font->width(font->userdata, font->height, string, length);
    if (text_width > r.w){
        float txt_width = (float)text_width;
        int glyphs = 0;
        length = nk_text_clamp(font, string, length,
                    r.w, &glyphs, &txt_width);
    }

    if (!length) return;
    cmd = (struct nk_command_text*)
        nk_command_buffer_push(b, NK_COMMAND_TEXT, sizeof(*cmd) + (nk_size)(length + 1));
    if (!cmd) return;
    cmd->x = (short)r.x;
    cmd->y = (short)r.y;
    cmd->w = (unsigned short)r.w;
    cmd->h = (unsigned short)r.h;
    cmd->background = bg;
    cmd->foreground = fg;
    cmd->font = font;
    cmd->length = length;
    cmd->height = font->height;
    NK_MEMCPY(cmd->string, string, (nk_size)length);
    cmd->string[length] = '\0';
}

/* ==============================================================
 *
 *                          DRAW LIST
 *
 * ===============================================================*/

#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
NK_API void
nk_draw_list_init(struct nk_draw_list *list)
{
    nk_size i = 0;
    nk_zero(list, sizeof(*list));
    for (i = 0; i < NK_LEN(list->circle_vtx); ++i) {
        const float a = ((float)i / (float)NK_LEN(list->circle_vtx)) * 2 * NK_PI;
        list->circle_vtx[i].x = (float)NK_COS(a);
        list->circle_vtx[i].y = (float)NK_SIN(a);
    }
}

NK_API void
nk_draw_list_setup(struct nk_draw_list *canvas, float global_alpha,
    enum nk_anti_aliasing line_AA, enum nk_anti_aliasing shape_AA,
    struct nk_draw_null_texture null, struct nk_buffer *cmds,
    struct nk_buffer *vertices, struct nk_buffer *elements)
{
    canvas->null = null;
    canvas->clip_rect = nk_null_rect;
    canvas->vertices = vertices;
    canvas->elements = elements;
    canvas->buffer = cmds;
    canvas->line_AA = line_AA;
    canvas->shape_AA = shape_AA;
    canvas->global_alpha = global_alpha;
}

NK_API const struct nk_draw_command*
nk__draw_list_begin(const struct nk_draw_list *canvas, const struct nk_buffer *buffer)
{
    nk_byte *memory;
    nk_size offset;
    const struct nk_draw_command *cmd;

    NK_ASSERT(buffer);
    if (!buffer || !buffer->size || !canvas->cmd_count)
        return 0;

    memory = (nk_byte*)buffer->memory.ptr;
    offset = buffer->memory.size - canvas->cmd_offset;
    cmd = nk_ptr_add(const struct nk_draw_command, memory, offset);
    return cmd;
}

NK_API const struct nk_draw_command*
nk__draw_list_next(const struct nk_draw_command *cmd,
    const struct nk_buffer *buffer, const struct nk_draw_list *canvas)
{
    nk_byte *memory;
    nk_size size;
    nk_size offset;
    const struct nk_draw_command *end;

    NK_ASSERT(buffer);
    NK_ASSERT(canvas);
    if (!cmd || !buffer || !canvas)
        return 0;

    memory = (nk_byte*)buffer->memory.ptr;
    size = buffer->memory.size;
    offset = size - canvas->cmd_offset;
    end = nk_ptr_add(const struct nk_draw_command, memory, offset);
    end -= (canvas->cmd_count-1);

    if (cmd <= end) return 0;
    return (cmd-1);
}

NK_API void
nk_draw_list_clear(struct nk_draw_list *list)
{
    NK_ASSERT(list);
    if (!list) return;
    if (list->buffer)
        nk_buffer_clear(list->buffer);
    if (list->elements)
        nk_buffer_clear(list->vertices);
    if (list->vertices)
        nk_buffer_clear(list->elements);

    list->element_count = 0;
    list->vertex_count = 0;
    list->cmd_offset = 0;
    list->cmd_count = 0;
    list->path_count = 0;
    list->vertices = 0;
    list->elements = 0;
    list->clip_rect = nk_null_rect;
}

NK_INTERN struct nk_vec2*
nk_draw_list_alloc_path(struct nk_draw_list *list, int count)
{
    struct nk_vec2 *points;
    NK_STORAGE const nk_size point_align = NK_ALIGNOF(struct nk_vec2);
    NK_STORAGE const nk_size point_size = sizeof(struct nk_vec2);
    points = (struct nk_vec2*)
        nk_buffer_alloc(list->buffer, NK_BUFFER_FRONT,
                        point_size * (nk_size)count, point_align);

    if (!points) return 0;
    if (!list->path_offset) {
        void *memory = nk_buffer_memory(list->buffer);
        list->path_offset = (unsigned int)((nk_byte*)points - (nk_byte*)memory);
    }
    list->path_count += (unsigned int)count;
    return points;
}

NK_INTERN struct nk_vec2
nk_draw_list_path_last(struct nk_draw_list *list)
{
    void *memory;
    struct nk_vec2 *point;
    NK_ASSERT(list->path_count);
    memory = nk_buffer_memory(list->buffer);
    point = nk_ptr_add(struct nk_vec2, memory, list->path_offset);
    point += (list->path_count-1);
    return *point;
}

NK_INTERN struct nk_draw_command*
nk_draw_list_push_command(struct nk_draw_list *list, struct nk_rect clip,
    nk_handle texture)
{
    NK_STORAGE const nk_size cmd_align = NK_ALIGNOF(struct nk_draw_command)</