Added OpenGL3 for SFML and also working on "pure" SFML renderer.

demo/sfml/Makefile

@@ -0,0 +1,8 @@
+SFML_INC = -I C:/Users/Ricky/MinGW-Libs/SFML/include
+SFML_LIB = -L C:/Users/Ricky/MinGW-Libs/SFML/lib
+
+LIBS = -DSFML_STATIC -lmingw32 -lsfml-window-s -lsfml-system-s -lopengl32 -lwinmm -lgdi32
+
+
+build:
+	g++ main.cpp $(SFML_INC) $(SFML_LIB) $(LIBS) -o demo.exe

demo/sfml/build.bat

@@ -0,0 +1,2 @@
+mingw32-make -f Makefile
+pause

demo/sfml/main.cpp

@@ -0,0 +1,178 @@
+/* nuklear - v1.32.0 - public domain */
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+#include <math.h>
+#include <assert.h>
+#include <math.h>
+#include <limits.h>
+#include <time.h>
+
+#include <SFML/Window.hpp>
+#include <SFML/OpenGL.hpp>
+
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_STANDARD_IO
+#define NK_INCLUDE_STANDARD_VARARGS
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
+#define NK_INCLUDE_FONT_BAKING
+#define NK_INCLUDE_DEFAULT_FONT
+#define NK_IMPLEMENTATION
+#define NK_SFML_GL2_IMPLEMENTATION
+#include "../../nuklear.h"
+#include "nuklear_sfml_gl2.h"
+
+#define WINDOW_WIDTH 800
+#define WINDOW_HEIGHT 600
+
+#define MAX_VERTEX_BUFFER 512 * 1024
+#define MAX_ELEMENT_BUFFER 128 * 1024
+
+#define UNUSED(a) (void)a
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+#define MAX(a,b) ((a) < (b) ? (b) : (a))
+#define LEN(a) (sizeof(a)/sizeof(a)[0])
+
+/* ===============================================================
+ *
+ *                          EXAMPLE
+ *
+ * ===============================================================*/
+/* This are some code examples to provide a small overview of what can be
+ * done with this library. To try out an example uncomment the include
+ * and the corresponding function. */
+//#include "../style.c"
+//#include "../calculator.c"
+#include "../overview.c"
+//#include "../node_editor.c"
+
+/* ===============================================================
+ *
+ *                          DEMO
+ *
+ * ===============================================================*/
+int main(void)
+{
+    /* Platform */
+    sf::ContextSettings settings(24, 8, 4, 2, 2);
+    sf::Window window(sf::VideoMode(WINDOW_WIDTH, WINDOW_HEIGHT), "Demo", sf::Style::Default, settings);
+
+    window.setVerticalSyncEnabled(true);
+    window.setActive(true);
+
+    glViewport(0, 0, window.getSize().x, window.getSize().y);
+    struct nk_context *ctx;
+    struct nk_color background;
+
+    /* GUI */
+    ctx = nk_sfml_init(&window);
+    /* Load Fonts: if none of these are loaded a default font will be used  */
+    /* Load Cursor: if you uncomment cursor loading please hide the cursor */
+    {
+        struct nk_font_atlas *atlas;
+        nk_sfml_font_stash_begin(&atlas);
+        /*struct nk_font *droid = nk_font_atlas_add_from_file(atlas, "../../../extra_font/DroidSans.ttf", 14, 0);*/
+        /*struct nk_font *roboto = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Roboto-Regular.ttf", 14, 0);*/
+        /*struct nk_font *future = nk_font_atlas_add_from_file(atlas, "../../../extra_font/kenvector_future_thin.ttf", 13, 0);*/
+        /*struct nk_font *clean = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyClean.ttf", 12, 0);*/
+        /*struct nk_font *tiny = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyTiny.ttf", 10, 0);*/
+        /*struct nk_font *cousine = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Cousine-Regular.ttf", 13, 0);*/
+        nk_sfml_font_stash_end();
+        /*nk_style_load_all_cursors(ctx, atlas->cursors);*/
+        /*nk_style_set_font(ctx, &droid->handle);*/
+    }
+
+    /* style.c */
+    /*set_style(ctx, THEME_WHITE);*/
+    /*set_style(ctx, THEME_RED);*/
+    /*set_style(ctx, THEME_BLUE);*/
+    /*set_style(ctx, THEME_DARK);*/
+
+    background = nk_rgb(28,48,62);
+
+    while (window.isOpen())
+    {
+        /* Input */
+        sf::Event event;
+
+        nk_input_begin(ctx);
+        while(window.pollEvent(event))
+        {
+            if(event.type == sf::Event::Closed)
+                window.close();
+            else if(event.type == sf::Event::Resized)
+            {
+                // adjust the viewport when the window is resized
+                glViewport(0, 0, event.size.width, event.size.height);
+            }
+
+            nk_sfml_handle_event(&event);
+        }
+        nk_input_end(ctx);
+
+        /* GUI */
+        if (nk_begin(ctx, "Demo", nk_rect(50, 50, 230, 250),
+            NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
+            NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
+        {
+            enum {EASY, HARD};
+            static int op = EASY;
+            static int property = 20;
+            nk_layout_row_static(ctx, 30, 80, 1);
+            if (nk_button_label(ctx, "button"))
+                fprintf(stdout, "button pressed\n");
+
+            nk_layout_row_dynamic(ctx, 30, 2);
+            if (nk_option_label(ctx, "easy", op == EASY)) op = EASY;
+            if (nk_option_label(ctx, "hard", op == HARD)) op = HARD;
+
+            nk_layout_row_dynamic(ctx, 25, 1);
+            nk_property_int(ctx, "Compression:", 0, &property, 100, 10, 1);
+
+            nk_layout_row_dynamic(ctx, 20, 1);
+            nk_label(ctx, "background:", NK_TEXT_LEFT);
+            nk_layout_row_dynamic(ctx, 25, 1);
+            if (nk_combo_begin_color(ctx, background, nk_vec2(nk_widget_width(ctx),400))) {
+                nk_layout_row_dynamic(ctx, 120, 1);
+                background = nk_color_picker(ctx, background, NK_RGBA);
+                nk_layout_row_dynamic(ctx, 25, 1);
+                background.r = (nk_byte)nk_propertyi(ctx, "#R:", 0, background.r, 255, 1,1);
+                background.g = (nk_byte)nk_propertyi(ctx, "#G:", 0, background.g, 255, 1,1);
+                background.b = (nk_byte)nk_propertyi(ctx, "#B:", 0, background.b, 255, 1,1);
+                background.a = (nk_byte)nk_propertyi(ctx, "#A:", 0, background.a, 255, 1,1);
+                nk_combo_end(ctx);
+            }
+        }
+        nk_end(ctx);
+
+        /* -------------- EXAMPLES ---------------- */
+        //calculator(ctx);
+        overview(ctx);
+        //node_editor(ctx);
+        /* ----------------------------------------- */
+
+        /* Draw */
+        {
+            window.setActive(true);
+
+            float bg[4];
+            nk_color_fv(bg, background);
+            glClear(GL_COLOR_BUFFER_BIT);
+            glClearColor(bg[0], bg[1], bg[2], bg[3]);
+            /* IMPORTANT: `nk_sfml_render` modifies some global OpenGL state
+            * with blending, scissor, face culling and depth test and defaults everything
+            * back into a default state. Make sure to either save and restore or
+            * reset your own state after drawing rendering the UI. */
+            nk_sfml_render(NK_ANTI_ALIASING_ON, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
+            
+            window.display();
+        }
+    }
+
+    nk_sfml_shutdown();
+    return 0;
+}
+

demo/sfml/nuklear_sfml.h

@@ -0,0 +1,582 @@
+/*
+ * Nuklear - 1.32.0 - public domain
+ * no warrenty implied; use at your own risk.
+ * authored from 2015-2016 by Micha Mettke
+ */
+/*
+ * ==============================================================
+ *
+ *                              API
+ *
+ * ===============================================================
+ */
+#ifndef NK_SFML_H_
+#define NK_SFML_H_
+
+#include <string>
+#include <SFML/Graphics.hpp>
+
+NK_API struct nk_context*	nk_sfml_init(NkSFMLFont* sfmlfont, sf::RenderWindow* window, sf::View view);
+NK_API int 					nk_sfml_handle_event(sf::Event* event);
+NK_API void 				nk_sfml_render(enum nk_anti_aliasing, int max_vertex_buffer, int max_element_buffer);
+NK_API void 				nk_sfml_shutdown(void);
+
+typedef struct NkSFMLFont;
+NK_API NkSFMLFont*			nk_sfml_font_create(const std::string& file_name, int font_size, int flags);
+NK_API void					nk_sfml_font_delete(NkSFMLFont);
+NK_API void					nk_sfml_font_set(NkSFMLFont);
+
+#endif
+/*
+ * ==============================================================
+ *
+ *                          IMPLEMENTATION
+ *
+ * ===============================================================
+ */
+ #ifdef NK_SFML_IMPLEMENTATION
+
+sf::Shape& RoundedRectangle(float rectWidth, float rectHeight, float radius)
+{
+	sf::Shape round_rect;
+	rect->SetOutlineWidth(Outline);
+
+	float a = 0.0f;
+	float b = 0.0f;
+
+	for(int i=0; i<POINTS; i++)
+	{
+		X+=radius/POINTS;
+		Y=sqrt(radius*radius-X*X);
+		rrect->AddPoint(X+x+rectWidth-radius,y-Y+radius,Col,OutlineCol);
+	}
+	Y=0;
+	for(int i=0; i<POINTS; i++)
+	{
+		Y+=radius/POINTS;
+		X=sqrt(radius*radius-Y*Y);
+		rrect->AddPoint(x+rectWidth+X-radius,y+rectHeight-radius+Y,Col,OutlineCol);
+	}
+	X=0;
+	for(int i=0; i<POINTS; i++)
+	{
+		X+=radius/POINTS;
+		Y=sqrt(radius*radius-X*X);
+		rrect->AddPoint(x+radius-X,y+rectHeight-radius+Y,Col,OutlineCol);
+	}
+	Y=0;
+	for(int i=0; i<POINTS; i++)
+	{
+		Y+=radius/POINTS;
+		X=sqrt(radius*radius-Y*Y);
+		rrect->AddPoint(x-X+radius,y+radius-Y,Col,OutlineCol);
+	}
+	return *rrect;
+	
+}
+
+struct NkSFMLFont
+{
+	struct nk_user_font nk;
+	int height;
+	sf::Font font;
+};
+
+static struct nk_sfml
+{
+	sf::RenderWindow* window;
+	sf::View view;
+	struct nk_context ctx;
+	struct nk_buffer cmds;
+} sfml;
+
+NK_API NkSFMLFont*
+nk_sfml_font_create(const std::string& file_name)
+{
+	NkSFMLFont* font = (NkSFMLFont*)calloc(1, sizeof(NkSFMLFont));
+	
+	if(!font->font.loadFromFile(file_name))
+	{
+		fprintf(stdout, "Unable to load font file: %s\n", file_name);
+		return NULL;
+	}
+
+	// I really need to think of a better way of doing this
+	sf::Text text("abjdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789", font->font);
+	font->height = text.getGlobalBounds().height;
+
+	return font;
+}
+
+static float
+nk_sfml_font_get_text_width(nk_handle handle, float height, const char* string, int len)
+{
+	NkSFMLFont* font = (NkSFMLFont*)handle.ptr;
+
+	if(!font || !string)
+		return 0;
+
+	sf::Text sfmltext(font->font, string);
+
+	//char strcpy[len + 1];
+	//strncpy((char*)&strcpy, text, len);
+	//strcpy[len] = '\0';
+
+	return sfmltext.getGlobalBounds().width;
+}
+
+NK_API void
+nk_sfml_font_set(NkSFMLFont* sfmlfont)
+{
+	struct nk_user_font* font = &sfmlfont->nk;
+	font->userdata = nk_handle_ptr(sfmlfont);
+	font->height = (float)sfmlfont->height;
+	font->width = nk_sfml_font_get_text_width;
+	nk_style_set_font(&sfml.ctx, font);
+}
+
+NK_API void
+nk_sfml_font_del(NkSFMLFont* font)
+{
+	if(!font)
+		return;
+
+	free(font);
+}
+
+static sf::Color
+nk_color_to_sfml(struct nk_color color)
+{
+	return sf::Color(color.r, color.g, color.b, color.a);
+}
+
+NK_API void
+nk_sfml_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer)
+{
+    const struct nk_command *cmd;
+
+
+
+    nk_foreach(cmd, &sfml.ctx)
+    {
+        sf::Color color;
+
+        switch (cmd->type)
+        {
+        	case NK_COMMAND_NOP: break;
+        	case NK_COMMAND_SCISSOR:
+        	{
+            	const struct nk_command_scissor *s = (const struct nk_command_scissor*)cmd;
+            	
+            	
+            	//sf::RenderTexture clip_tex((unsigned int)s->x, (unsigned int)s->y);
+            	//sf::Sprite clip;
+            	sf::View view;
+            	view.setCenter(s->x, s->y);
+            	view.setSize(s->w, s->h);
+            	sfml.window->setView(view);
+            	//al_set_clipping_rectangle((int)s->x, (int)s->y, (int)s->w, (int)s->h);
+        	} break;
+        	case NK_COMMAND_LINE:
+        	{
+            	const struct nk_command_line *l = (const struct nk_command_line *)cmd;
+            	
+            	color = nk_color_to_sfml(l->color);
+
+            	sf::Vertex line[] = 
+            	{
+            		sf::Vertex(sf::Vector2f((float)l->begin.x - l->line_thickness, (float)l->begin.y + l->line_thickness), color),
+            		sf::Vertex(sf::Vector2f((float)l->begin.x + l->line_thickness, (float)l->begin.y - l->line_thickness), color),
+            		sf::Vertex(sf::Vector2f((float)l->end.x + l->line_thickness, (float)l->end.y - l->line_thickness), color),
+            		sf::Vertex(sf::Vector2f((float)l->end.x - l->line_thickness, (float)l->end.y + l->line_thickness), color)
+            	};
+
+            	sfml.window->draw(line, sf::Quads);
+        	} break;
+        	case NK_COMMAND_RECT:
+        	{
+            	const struct nk_command_rect *r = (const struct nk_command_rect *)cmd;
+            	
+            	color = nk_color_to_sfml(l->color);
+
+            	sf::RectangleShape rect;
+            	rect.setSize(sf::Vector2f(()))
+
+            	sfml.window->draw(line, sf::Quads);
+
+
+            	color = nk_color_to_sfml(r->color);
+            	al_draw_rounded_rectangle(
+            		(float)r->x, (float)r->y, (float)(r->x + r->w),
+                	(float)(r->y + r->h), (float)r->rounding, (float)r->rounding, color,
+                	(float)r->line_thickness);
+        	} break;
+        	case NK_COMMAND_RECT_FILLED:
+        	{
+            	const struct nk_command_rect_filled *r = (const struct nk_command_rect_filled *)cmd;
+            	
+            	color = nk_color_to_sfml(r->color);
+            	al_draw_filled_rounded_rectangle(
+            		(float)r->x, (float)r->y,
+                	(float)(r->x + r->w), (float)(r->y + r->h), (float)r->rounding,
+                	(float)r->rounding, color);
+        	} break;
+        	case NK_COMMAND_CIRCLE:
+        	{
+            	const struct nk_command_circle *c = (const struct nk_command_circle *)cmd;
+            	
+            	color = nk_color_to_sfml(c->color);
+            	float xr, yr;
+            	xr = (float)c->w/2;
+            	yr = (float)c->h/2;
+            	al_draw_ellipse(
+            		((float)(c->x)) + xr, ((float)c->y) + yr,
+                	xr, yr, color, (float)c->line_thickness);
+        	} break;
+        	case NK_COMMAND_CIRCLE_FILLED:
+        	{
+            	const struct nk_command_circle_filled *c = (const struct nk_command_circle_filled *)cmd;
+            	
+            	color = nk_color_to_sfml(c->color);
+            	float xr, yr;
+            	xr = (float)c->w/2;
+            	yr = (float)c->h/2;
+            	al_draw_filled_ellipse(
+            		((float)(c->x)) + xr, ((float)c->y) + yr,
+                	xr, yr, color);
+        	} break;
+        	case NK_COMMAND_TRIANGLE:
+        	{
+            	const struct nk_command_triangle*t = (const struct nk_command_triangle*)cmd;
+            	
+            	color = nk_color_to_sfml(t->color);
+            	al_draw_triangle(
+            		(float)t->a.x, (float)t->a.y, (float)t->b.x, (float)t->b.y,
+                	(float)t->c.x, (float)t->c.y, color, (float)t->line_thickness);
+        	} break;
+        	case NK_COMMAND_TRIANGLE_FILLED:
+        	{
+            	const struct nk_command_triangle_filled *t = (const struct nk_command_triangle_filled *)cmd;
+            	
+            	color = nk_color_to_sfml(t->color);
+            	al_draw_filled_triangle(
+            		(float)t->a.x, (float)t->a.y, (float)t->b.x,
+                	(float)t->b.y, (float)t->c.x, (float)t->c.y, color);
+        	} break;
+        	case NK_COMMAND_POLYGON:
+        	{
+            	const struct nk_command_polygon *p = (const struct nk_command_polygon*)cmd;
+            	
+            	color = nk_color_to_sfml(p->color);
+            	int i;
+            	float vertices[p->point_count * 2];
+            	
+            	for (i = 0; i < p->point_count; i++)
+            	{
+                	vertices[i*2] = p->points[i].x;
+                	vertices[(i*2) + 1] = p->points[i].y;
+            	}
+            	
+            	al_draw_polyline(
+            		(const float*)&vertices, (2 * sizeof(float)),
+                	(int)p->point_count, ALLEGRO_LINE_JOIN_ROUND, ALLEGRO_LINE_CAP_CLOSED,
+                	color, (float)p->line_thickness, 0.0);
+        	} break;
+        	case NK_COMMAND_POLYGON_FILLED:
+        	{
+            	const struct nk_command_polygon_filled *p = (const struct nk_command_polygon_filled *)cmd;
+            	
+            	color = nk_color_to_sfml(p->color);
+            	int i;
+            	float vertices[p->point_count * 2];
+            	
+            	for (i = 0; i < p->point_count; i++)
+            	{
+                	vertices[i*2] = p->points[i].x;
+                	vertices[(i*2) + 1] = p->points[i].y;
+            	}
+            	
+            	al_draw_filled_polygon((const float*)&vertices, (int)p->point_count, color);
+        	} break;
+        	case NK_COMMAND_POLYLINE:
+        	{
+            	const struct nk_command_polyline *p = (const struct nk_command_polyline *)cmd;
+            
+            	color = nk_color_to_sfml(p->color);
+            	int i;
+            	float vertices[p->point_count * 2];
+            
+            	for (i = 0; i < p->point_count; i++)
+            	{
+                	vertices[i*2] = p->points[i].x;
+                	vertices[(i*2) + 1] = p->points[i].y;
+            	}
+            	
+            	al_draw_polyline(
+            		(const float*)&vertices, (2 * sizeof(float)),
+                	(int)p->point_count, ALLEGRO_LINE_JOIN_ROUND, ALLEGRO_LINE_CAP_ROUND,
+        	        color, (float)p->line_thickness, 0.0);
+        	} break;
+        	case NK_COMMAND_TEXT:
+        	{
+	            const struct nk_command_text *t = (const struct nk_command_text*)cmd;
+            	
+            	color = nk_color_to_sfml(t->foreground);
+            	NkAllegro5Font *font = (NkAllegro5Font*)t->font->userdata.ptr;
+            	
+            	al_draw_text(
+            		font->font,
+                	color, (float)t->x, (float)t->y, 0,
+                	(const char*)t->string);
+        	} break;
+        	case NK_COMMAND_CURVE:
+        	{
+            	const struct nk_command_curve *q = (const struct nk_command_curve *)cmd;
+            	
+            	color = nk_color_to_sfml(q->color);
+            	float points[8];
+            	points[0] = (float)q->begin.x;
+            	points[1] = (float)q->begin.y;
+            	points[2] = (float)q->ctrl[0].x;
+            	points[3] = (float)q->ctrl[0].y;
+            	points[4] = (float)q->ctrl[1].x;
+            	points[5] = (float)q->ctrl[1].y;
+            	points[6] = (float)q->end.x;
+            	points[7] = (float)q->end.y;
+            	al_draw_spline(points, color, (float)q->line_thickness);
+        	} break;
+        	case NK_COMMAND_ARC:
+        	{
+            	const struct nk_command_arc *a = (const struct nk_command_arc *)cmd;
+            	
+            	color = nk_color_to_sfml(a->color);
+            	al_draw_arc(
+            		(float)a->cx, (float)a->cy, (float)a->r, a->a[0],
+                	a->a[1], color, (float)a->line_thickness);
+        	} break;
+        	case NK_COMMAND_RECT_MULTI_COLOR:
+        	case NK_COMMAND_IMAGE:
+        	case NK_COMMAND_ARC_FILLED:
+        	default: break;
+        }
+    }
+    nk_clear(&allegro5.ctx);
+}
+
+static void
+nk_sfml_clipboard_paste(nk_handle usr, struct nk_text_edit* edit)
+{
+	/* Not Implemented in SFML 
+	sf::Clipboard clipboard(sfml.window);
+	const char* text = clipboard.getText();
+
+	if(text)
+		nk_textedit_paste(edit, text, nk_strlen(text));
+		(void)usr;
+	*/
+}
+
+static void
+nk_sfml_clipboard_copy(nk_handle usr, const char* text, int len)
+{
+	char* str = 0;
+	(void)usr;
+	if(!len)
+		return;
+	str = (char*)malloc((size_t)len+1);
+	if(!str)
+		return;
+	memcpy(str, text, (size_t)len);
+	str[len] = '\0';
+
+	/* Not Implemented in SFML
+	sf::Clipboard clipboard(sfml.window);
+	clipboard.setText(str);
+	*/
+
+	free(str);
+}
+
+NK_API struct nk_context*
+nk_sfml_init(NkSFMLFont* sfmlfont, sf::RenderWindow* window, sf::View view)
+{
+	struct nk_user_font* font = &sfmlfont->nk;
+	font->userdata = nk_handle_ptr(sfmlfont);
+	font->height = (float)sfmlfont->height;
+	font->width = nk_sfml_get_text_width;
+
+	sfml.window = window;
+	sfml.view = view;
+
+	nk_init_default(&sfml.ctx, font);
+	sfml.ctx.clip.copy = nk_sfml_clipboard_copy;
+	sfml.ctx.clip.paste = nk_sfml_clipboard_paste;
+	sfml.ctx.clip.userdata = nk_handle_ptr(0);
+	return &sfml.ctx;
+}
+
+NK_API int
+nk_sfml_handle_event(sf::Event* event)
+{
+	struct nk_context* ctx = &sfml.ctx;
+
+	/* optional grabbing behavior */
+	if(ctx->input.mouse.grab)
+	{
+		sfml.window->setMouseCursorGrabbed(true);
+		ctx->input.mouse.grab = 0;
+	}
+	else if(ctx->input.mouse.ungrab)
+	{
+		int x = (int)ctx->input.mouse.prev.x;
+		int y = (int)ctx->input.mouse.prev.y;
+		sfml.window->setMouseCursorGrabbed(false);
+		sf::Mouse::setPosition(sf::Vector2i(x, y));
+		ctx->input.mouse.ungrab = 0;
+	}
+
+	if(event->type == sf::Event::KeyReleased || event->type == sf::Event::KeyPressed)
+	{
+		int down = event->type == sf::Event::KeyPressed;
+		sf::Keyboard::Key key = event->key.code;
+
+		if(key == sf::Keyboard::RShift || key == sf::Keyboard::LShift)
+			nk_input_key(ctx, NK_KEY_SHIFT, down);
+		else if(key == sf::Keyboard::Delete)
+			nk_input_key(ctx, NK_KEY_DEL, down);
+		else if(key == sf::Keyboard::Return)
+			nk_input_key(ctx, NK_KEY_ENTER, down);
+		else if(key == sf::Keyboard::Tab)
+			nk_input_key(ctx, NK_KEY_TAB, down);
+		else if(key == sf::Keyboard::BackSpace)
+			nk_input_key(ctx, NK_KEY_BACKSPACE, down);
+		else if(key == sf::Keyboard::Home)
+		{
+			nk_input_key(ctx, NK_KEY_TEXT_START, down);
+			nk_input_key(ctx, NK_KEY_SCROLL_START, down);
+		}
+		else if(key == sf::Keyboard::End)
+		{
+			nk_input_key(ctx, NK_KEY_TEXT_END, down);
+			nk_input_key(ctx, NK_KEY_SCROLL_END, down);
+		}
+		else if(key == sf::Keyboard::PageDown)
+			nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
+		else if(key == sf::Keyboard::PageUp)
+			nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
+		else if(key == sf::Keyboard::Z)
+			nk_input_key(ctx, NK_KEY_TEXT_UNDO, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::R)
+			nk_input_key(ctx, NK_KEY_TEXT_REDO, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::C)
+			nk_input_key(ctx, NK_KEY_COPY, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::V)
+			nk_input_key(ctx, NK_KEY_PASTE, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::X)
+			nk_input_key(ctx, NK_KEY_CUT, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::B)
+			nk_input_key(ctx, NK_KEY_TEXT_LINE_START, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::E)
+			nk_input_key(ctx, NK_KEY_TEXT_LINE_END, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::Up)
+			nk_input_key(ctx, NK_KEY_UP, down);
+		else if(key == sf::Keyboard::Down)
+			nk_input_key(ctx, NK_KEY_DOWN, down);
+		else if(key == sf::Keyboard::Left)
+		{
+			if(sf::Keyboard::isKeyPressed(sf::Keyboard::LControl))
+				nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, down);
+			else
+				nk_input_key(ctx, NK_KEY_LEFT, down);
+		}
+		else if(key == sf::Keyboard::Right)
+		{
+			if(sf::Keyboard::isKeyPressed(sf::Keyboard::LControl))
+				nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, down);
+			else
+				nk_input_key(ctx, NK_KEY_RIGHT, down);
+		}
+		else return 0;
+
+		return 1;
+	}
+	else if(event->type == sf::Event::MouseButtonPressed || event->type == sf::Event::MouseButtonReleased)
+	{
+		int down = event->type == sf::Event::MouseButtonPressed;
+		const int x = event->mouseButton.x;
+		const int y = event->mouseButton.y;
+
+		if(event->mouseButton.button == sf::Mouse::Left)
+			nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
+		if(event->mouseButton.button == sf::Mouse::Middle)
+			nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down);
+		if(event->mouseButton.button == sf::Mouse::Right)
+			nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down);
+		else
+			return 0;
+
+		return 1;
+	}
+	else if(event->type == sf::Event::MouseMoved)
+	{
+		if(ctx->input.mouse.grabbed)
+		{
+			int x = (int)ctx->input.mouse.prev.x + event->mouseMove.x;
+			int y = (int)ctx->input.mouse.prev.y + event->mouseMove.y;
+
+			nk_input_motion(ctx, x, y);
+		}
+		else
+			nk_input_motion(ctx, event->mouseMove.x, event->mouseMove.y);
+
+		return 1;
+	}
+	/* For Android*/
+	else if(event->type == sf::Event::TouchBegan || event->type == sf::Event::TouchEnded)
+	{
+		int down = event->type == sf::Event::TouchBegan;
+		const int x = event->touch.x;
+		const int y = event->touch.y;
+
+		nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
+
+		return 1;
+	}
+	else if(event->type == sf::Event::TouchMoved)
+	{
+		if(ctx->input.mouse.grabbed)
+		{
+			int x = (int)ctx->input.mouse.prev.x;
+			int y = (int)ctx->input.mouse.prev.y;
+
+			nk_input_motion(ctx, x + event->touch.x, y + event->touch.y);
+		}
+		else
+			nk_input_motion(ctx, event->touch.x, event->touch.y);
+
+		return 1;
+	}
+	else if(event->type == sf::Event::TextEntered)
+	{
+		nk_input_unicode(ctx, event->text.unicode);
+
+		return 1;
+	}
+	else if(event->type == sf::Event::MouseWheelScrolled)
+	{
+		nk_input_scroll(ctx, event->mouseWheelScroll.delta);
+
+		return 1;
+	}
+
+	return 0;
+}
+
+NK_API
+void nk_sfml_shutdown(void)
+{
+	nk_free(&sfml.ctx);
+	memset(&sfml, 0, sizeof(sfml));
+}
+
+#endif

demo/sfml_opengl3/Makefile

@@ -0,0 +1,10 @@
+GLAD_INC = -I C:/Users/Ricky/MinGW-Libs/GLAD/include
+
+SFML_INC = -I C:/Users/Ricky/MinGW-Libs/SFML/include
+SFML_LIB = -L C:/Users/Ricky/MinGW-Libs/SFML/lib
+
+LIBS = -DGLAD_HEADER_ONLY -DSFML_STATIC -lmingw32 -lsfml-window-s -lsfml-system-s -lopengl32 -lwinmm -lgdi32
+
+
+build:
+	g++ main.cpp $(GLAD_INC) $(SFML_INC) $(SFML_LIB) $(LIBS) -o demo.exe

demo/sfml_opengl3/build.bat

@@ -0,0 +1,2 @@
+mingw32-make -f Makefile
+pause

demo/sfml_opengl3/main.cpp

@@ -0,0 +1,183 @@
+/* nuklear - v1.32.0 - public domain */
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+#include <math.h>
+#include <assert.h>
+#include <math.h>
+#include <limits.h>
+#include <time.h>
+
+#include <SFML/Window.hpp>
+
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_STANDARD_IO
+#define NK_INCLUDE_STANDARD_VARARGS
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
+#define NK_INCLUDE_FONT_BAKING
+#define NK_INCLUDE_DEFAULT_FONT
+#define NK_IMPLEMENTATION
+#define NK_SFML_GL3_IMPLEMENTATION
+#include "../../nuklear.h"
+#include "nuklear_sfml_gl3.h"
+
+#define WINDOW_WIDTH 800
+#define WINDOW_HEIGHT 600
+
+#define MAX_VERTEX_BUFFER 512 * 1024
+#define MAX_ELEMENT_BUFFER 128 * 1024
+
+#define UNUSED(a) (void)a
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+#define MAX(a,b) ((a) < (b) ? (b) : (a))
+#define LEN(a) (sizeof(a)/sizeof(a)[0])
+
+/* ===============================================================
+ *
+ *                          EXAMPLE
+ *
+ * ===============================================================*/
+/* This are some code examples to provide a small overview of what can be
+ * done with this library. To try out an example uncomment the include
+ * and the corresponding function. */
+//#include "../style.c"
+//#include "../calculator.c"
+#include "../overview.c"
+//#include "../node_editor.c"
+
+/* ===============================================================
+ *
+ *                          DEMO
+ *
+ * ===============================================================*/
+int main(void)
+{
+    /* Platform */
+    sf::ContextSettings settings(24, 8, 4, 3, 3);
+    sf::Window window(sf::VideoMode(WINDOW_WIDTH, WINDOW_HEIGHT), "Demo", sf::Style::Default, settings);
+
+    window.setVerticalSyncEnabled(true);
+    window.setActive(true);
+
+    if(!gladLoadGL())
+    {
+        printf("Failed to load OpenGL extensions!\n");
+        return -1;
+    }
+
+    glViewport(0, 0, window.getSize().x, window.getSize().y);
+    struct nk_context *ctx;
+    struct nk_color background;
+
+    /* GUI */
+    ctx = nk_sfml_init(&window);
+    /* Load Fonts: if none of these are loaded a default font will be used  */
+    /* Load Cursor: if you uncomment cursor loading please hide the cursor */
+    {
+        struct nk_font_atlas *atlas;
+        nk_sfml_font_stash_begin(&atlas);
+        /*struct nk_font *droid = nk_font_atlas_add_from_file(atlas, "../../../extra_font/DroidSans.ttf", 14, 0);*/
+        /*struct nk_font *roboto = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Roboto-Regular.ttf", 14, 0);*/
+        /*struct nk_font *future = nk_font_atlas_add_from_file(atlas, "../../../extra_font/kenvector_future_thin.ttf", 13, 0);*/
+        /*struct nk_font *clean = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyClean.ttf", 12, 0);*/
+        /*struct nk_font *tiny = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyTiny.ttf", 10, 0);*/
+        /*struct nk_font *cousine = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Cousine-Regular.ttf", 13, 0);*/
+        nk_sfml_font_stash_end();
+        /*nk_style_load_all_cursors(ctx, atlas->cursors);*/
+        /*nk_style_set_font(ctx, &droid->handle);*/
+    }
+
+    /* style.c */
+    /*set_style(ctx, THEME_WHITE);*/
+    /*set_style(ctx, THEME_RED);*/
+    /*set_style(ctx, THEME_BLUE);*/
+    /*set_style(ctx, THEME_DARK);*/
+
+    background = nk_rgb(28,48,62);
+
+    while (window.isOpen())
+    {
+        /* Input */
+        sf::Event event;
+
+        nk_input_begin(ctx);
+        while(window.pollEvent(event))
+        {
+            if(event.type == sf::Event::Closed)
+                window.close();
+            else if(event.type == sf::Event::Resized)
+            {
+                // adjust the viewport when the window is resized
+                glViewport(0, 0, event.size.width, event.size.height);
+            }
+
+            nk_sfml_handle_event(&event);
+        }
+        nk_input_end(ctx);
+
+        /* GUI */
+        if (nk_begin(ctx, "Demo", nk_rect(50, 50, 230, 250),
+            NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
+            NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
+        {
+            enum {EASY, HARD};
+            static int op = EASY;
+            static int property = 20;
+            nk_layout_row_static(ctx, 30, 80, 1);
+            if (nk_button_label(ctx, "button"))
+                fprintf(stdout, "button pressed\n");
+
+            nk_layout_row_dynamic(ctx, 30, 2);
+            if (nk_option_label(ctx, "easy", op == EASY)) op = EASY;
+            if (nk_option_label(ctx, "hard", op == HARD)) op = HARD;
+
+            nk_layout_row_dynamic(ctx, 25, 1);
+            nk_property_int(ctx, "Compression:", 0, &property, 100, 10, 1);
+
+            nk_layout_row_dynamic(ctx, 20, 1);
+            nk_label(ctx, "background:", NK_TEXT_LEFT);
+            nk_layout_row_dynamic(ctx, 25, 1);
+            if (nk_combo_begin_color(ctx, background, nk_vec2(nk_widget_width(ctx),400))) {
+                nk_layout_row_dynamic(ctx, 120, 1);
+                background = nk_color_picker(ctx, background, NK_RGBA);
+                nk_layout_row_dynamic(ctx, 25, 1);
+                background.r = (nk_byte)nk_propertyi(ctx, "#R:", 0, background.r, 255, 1,1);
+                background.g = (nk_byte)nk_propertyi(ctx, "#G:", 0, background.g, 255, 1,1);
+                background.b = (nk_byte)nk_propertyi(ctx, "#B:", 0, background.b, 255, 1,1);
+                background.a = (nk_byte)nk_propertyi(ctx, "#A:", 0, background.a, 255, 1,1);
+                nk_combo_end(ctx);
+            }
+        }
+        nk_end(ctx);
+
+        /* -------------- EXAMPLES ---------------- */
+        //calculator(ctx);
+        overview(ctx);
+        //node_editor(ctx);
+        /* ----------------------------------------- */
+
+        /* Draw */
+        {
+            window.setActive(true);
+
+            float bg[4];
+            nk_color_fv(bg, background);
+            glClear(GL_COLOR_BUFFER_BIT);
+            glClearColor(bg[0], bg[1], bg[2], bg[3]);
+            /* IMPORTANT: `nk_sfml_render` modifies some global OpenGL state
+            * with blending, scissor, face culling and depth test and defaults everything
+            * back into a default state. Make sure to either save and restore or
+            * reset your own state after drawing rendering the UI. */
+            nk_sfml_render(NK_ANTI_ALIASING_ON, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
+            
+            window.display();
+        }
+    }
+
+    nk_sfml_shutdown();
+    return 0;
+}
+

demo/sfml_opengl3/nuklear_sfml_gl3.h

@@ -0,0 +1,540 @@
+/*
+ * Nuklear - 1.32.0 - public domain
+ * no warrenty implied; use at your own risk.
+ * authored from 2015-2016 by Micha Mettke
+ */
+/*
+ * ==============================================================
+ *
+ *                              API
+ *
+ * ===============================================================
+ */
+#ifndef NK_SFML_GL3_H_
+#define NK_SFML_GL3_H_
+
+#include <glad/glad.h>
+#include <SFML/Window.hpp>
+
+NK_API struct nk_context*	nk_sfml_init(sf::Window* window);
+NK_API void					nk_sfml_font_stash_begin(struct nk_font_atlas** atlas);
+NK_API void					nk_sfml_font_stash_end(void);
+NK_API int 					nk_sfml_handle_event(sf::Event* event);
+NK_API void 				nk_sfml_render(enum nk_anti_aliasing, int max_vertex_buffer, int max_element_buffer);
+NK_API void 				nk_sfml_shutdown(void);
+
+NK_API void					nk_sfml_device_create(void);
+NK_API void					nk_sfml_device_destroy(void);
+
+#endif
+/*
+ * ==============================================================
+ *
+ *                          IMPLEMENTATION
+ *
+ * ===============================================================
+ */
+ #ifdef NK_SFML_GL3_IMPLEMENTATION
+
+#include <string>
+
+struct nk_sfml_device
+{
+	struct nk_buffer cmds;
+	struct nk_draw_null_texture null;
+	GLuint vbo, vao, ebo;
+    GLuint prog;
+    GLuint vert_shdr;
+    GLuint frag_shdr;
+    GLint attrib_pos;
+    GLint attrib_uv;
+    GLint attrib_col;
+    GLint uniform_tex;
+    GLint uniform_proj;
+	GLuint font_tex;
+};
+
+struct nk_sfml_vertex
+{
+	float position[2];
+	float uv[2];
+	nk_byte col[4];
+};
+
+static struct nk_sfml
+{
+	sf::Window* window;
+	struct nk_sfml_device ogl;
+	struct nk_context ctx;
+	struct nk_font_atlas atlas;
+} sfml;
+
+#ifdef __APPLE__
+  #define NK_SHADER_VERSION "#version 150\n"
+#else
+  #define NK_SHADER_VERSION "#version 300 es\n"
+#endif
+
+NK_API void
+nk_sfml_device_create(void)
+{
+	GLint status;
+	static const GLchar* vertex_shader =
+		NK_SHADER_VERSION
+        "uniform mat4 ProjMtx;\n"
+        "in vec2 Position;\n"
+        "in vec2 TexCoord;\n"
+        "in vec4 Color;\n"
+        "out vec2 Frag_UV;\n"
+        "out vec4 Frag_Color;\n"
+        "void main() {\n"
+        "   Frag_UV = TexCoord;\n"
+        "   Frag_Color = Color;\n"
+        "   gl_Position = ProjMtx * vec4(Position.xy, 0, 1);\n"
+        "}\n";
+    static const GLchar *fragment_shader =
+        NK_SHADER_VERSION
+        "precision mediump float;\n"
+        "uniform sampler2D Texture;\n"
+        "in vec2 Frag_UV;\n"
+        "in vec4 Frag_Color;\n"
+        "out vec4 Out_Color;\n"
+        "void main(){\n"
+        "   Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+        "}\n";
+
+    struct nk_sfml_device* dev = &sfml.ogl;
+    nk_buffer_init_default(&dev->cmds);
+
+    dev->prog = glCreateProgram();
+    dev->vert_shdr = glCreateShader(GL_VERTEX_SHADER);
+    dev->frag_shdr = glCreateShader(GL_FRAGMENT_SHADER);
+
+    glShaderSource(dev->vert_shdr, 1, &vertex_shader, 0);
+    glShaderSource(dev->frag_shdr, 1, &fragment_shader, 0);
+    glCompileShader(dev->vert_shdr);
+    glCompileShader(dev->frag_shdr);
+    
+    glGetShaderiv(dev->vert_shdr, GL_COMPILE_STATUS, &status);
+    assert(status == GL_TRUE);
+
+    glGetShaderiv(dev->frag_shdr, GL_COMPILE_STATUS, &status);
+    assert(status == GL_TRUE);
+
+    glAttachShader(dev->prog, dev->vert_shdr);
+    glAttachShader(dev->prog, dev->frag_shdr);
+    glLinkProgram(dev->prog);
+
+    glGetProgramiv(dev->prog, GL_LINK_STATUS, &status);
+    assert(status == GL_TRUE);
+
+    dev->uniform_tex = glGetUniformLocation(dev->prog, "Texture");
+    dev->uniform_proj = glGetUniformLocation(dev->prog, "ProjMtx");
+    dev->attrib_pos = glGetAttribLocation(dev->prog, "Position");
+    dev->attrib_uv = glGetAttribLocation(dev->prog, "TexCoord");
+    dev->attrib_col = glGetAttribLocation(dev->prog, "Color");
+
+    {
+        /* buffer setup */
+        GLsizei vs = sizeof(struct nk_sfml_vertex);
+        size_t vp = offsetof(struct nk_sfml_vertex, position);
+        size_t vt = offsetof(struct nk_sfml_vertex, uv);
+        size_t vc = offsetof(struct nk_sfml_vertex, col);
+
+        glGenBuffers(1, &dev->vbo);
+        glGenBuffers(1, &dev->ebo);
+        glGenVertexArrays(1, &dev->vao);
+
+        glBindVertexArray(dev->vao);
+        glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
+
+        glEnableVertexAttribArray((GLuint)dev->attrib_pos);
+        glEnableVertexAttribArray((GLuint)dev->attrib_uv);
+        glEnableVertexAttribArray((GLuint)dev->attrib_col);
+
+        glVertexAttribPointer((GLuint)dev->attrib_pos, 2, GL_FLOAT, GL_FALSE, vs, (void*)vp);
+        glVertexAttribPointer((GLuint)dev->attrib_uv, 2, GL_FLOAT, GL_FALSE, vs, (void*)vt);
+        glVertexAttribPointer((GLuint)dev->attrib_col, 4, GL_UNSIGNED_BYTE, GL_TRUE, vs, (void*)vc);
+    }
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
+}
+
+NK_API void
+nk_sfml_device_destroy(void)
+{
+	struct nk_sfml_device* dev = &sfml.ogl;
+
+	glDetachShader(dev->prog, dev->vert_shdr);
+	glDetachShader(dev->prog, dev->frag_shdr);
+	glDeleteShader(dev->vert_shdr);
+	glDeleteShader(dev->vert_shdr);
+	glDeleteProgram(dev->prog);
+	glDeleteTextures(1, &dev->font_tex);
+	glDeleteBuffers(1, &dev->vbo);
+	glDeleteBuffers(1, &dev->ebo);
+	nk_buffer_free(&dev->cmds);
+}
+
+NK_INTERN void
+nk_sfml_device_upload_atlas(const void* image, int width, int height)
+{
+	struct nk_sfml_device* dev = &sfml.ogl;
+	glGenTextures(1, &dev->font_tex);
+	glBindTexture(GL_TEXTURE_2D, dev->font_tex);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)width, (GLsizei)height, 0, 
+				GL_RGBA, GL_UNSIGNED_BYTE, image);
+}
+
+NK_API void
+nk_sfml_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer)
+{
+	/* setup global state */
+	struct nk_sfml_device* dev = &sfml.ogl;
+
+	int window_width = sfml.window->getSize().x;
+	int window_height = sfml.window->getSize().y;
+
+	GLfloat ortho[4][4] = 
+	{
+        {2.0f, 0.0f, 0.0f, 0.0f},
+        {0.0f,-2.0f, 0.0f, 0.0f},
+        {0.0f, 0.0f,-1.0f, 0.0f},
+        {-1.0f,1.0f, 0.0f, 1.0f},
+    };
+
+    ortho[0][0] /= (GLfloat)window_width;
+    ortho[1][1] /= (GLfloat)window_height;
+
+    glViewport(0, 0, window_width, window_height);
+    glEnable(GL_BLEND);
+    glBlendEquation(GL_FUNC_ADD);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glDisable(GL_CULL_FACE);
+    glDisable(GL_DEPTH_TEST);
+    glEnable(GL_SCISSOR_TEST);
+    glActiveTexture(GL_TEXTURE0);
+
+    /* setup program */
+    glUseProgram(dev->prog);
+    glUniform1i(dev->uniform_tex, 0);
+    glUniformMatrix4fv(dev->uniform_proj, 1, GL_FALSE, &ortho[0][0]);
+    {
+        /* convert from command queue into draw list and draw to screen */
+        const struct nk_draw_command *cmd;
+        void *vertices, *elements;
+        const nk_draw_index *offset = NULL;
+
+        /* allocate vertex and element buffer */
+        glBindVertexArray(dev->vao);
+        glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
+
+        glBufferData(GL_ARRAY_BUFFER, max_vertex_buffer, NULL, GL_STREAM_DRAW);
+        glBufferData(GL_ELEMENT_ARRAY_BUFFER, max_element_buffer, NULL, GL_STREAM_DRAW);
+
+        /* load vertices/elements directly into vertex/element buffer */
+        vertices = glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
+        elements = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY);
+
+        {
+            /* fill convert configuration */
+            struct nk_convert_config config;
+
+            static const struct nk_draw_vertex_layout_element vertex_layout[] = 
+            {
+                {NK_VERTEX_POSITION, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_sfml_vertex, position)},
+                {NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_sfml_vertex, uv)},
+                {NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_sfml_vertex, col)},
+                {NK_VERTEX_LAYOUT_END}
+            };
+
+            NK_MEMSET(&config, 0, sizeof(config));
+            config.vertex_layout = vertex_layout;
+            config.vertex_size = sizeof(struct nk_sfml_vertex);
+            config.vertex_alignment = NK_ALIGNOF(struct nk_sfml_vertex);
+            config.null = dev->null;
+            config.circle_segment_count = 22;
+            config.curve_segment_count = 22;
+            config.arc_segment_count = 22;
+            config.global_alpha = 1.0f;
+            config.shape_AA = AA;
+            config.line_AA = AA;
+
+            /* setup buffers to load vertices and elements */
+            {
+            	struct nk_buffer vbuf, ebuf;
+            	nk_buffer_init_fixed(&vbuf, vertices, (nk_size)max_vertex_buffer);
+            	nk_buffer_init_fixed(&ebuf, elements, (nk_size)max_element_buffer);
+            	nk_convert(&sfml.ctx, &dev->cmds, &vbuf, &ebuf, &config);
+            }
+        }
+
+        glUnmapBuffer(GL_ARRAY_BUFFER);
+        glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
+
+        /* iterate over and execute each draw command */
+        nk_draw_foreach(cmd, &sfml.ctx, &dev->cmds)
+        {
+            if (!cmd->elem_count) continue;
+
+            glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
+            glScissor(
+            	(GLint)(cmd->clip_rect.x),
+                (GLint)((window_height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h))),
+                (GLint)(cmd->clip_rect.w),
+                (GLint)(cmd->clip_rect.h));
+            glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
+            offset += cmd->elem_count;
+        }
+        nk_clear(&sfml.ctx);
+    }
+
+    glUseProgram(0);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
+    glDisable(GL_BLEND);
+    glDisable(GL_SCISSOR_TEST);
+}
+
+static void
+nk_sfml_clipboard_paste(nk_handle usr, struct nk_text_edit* edit)
+{
+	/* Not Implemented in SFML 
+	sf::Clipboard clipboard(sfml.window);
+	const char* text = clipboard.getText();
+
+	if(text)
+		nk_textedit_paste(edit, text, nk_strlen(text));
+		(void)usr;
+	*/
+}
+
+static void
+nk_sfml_clipboard_copy(nk_handle usr, const char* text, int len)
+{
+	char* str = 0;
+	(void)usr;
+	if(!len)
+		return;
+	str = (char*)malloc((size_t)len+1);
+	if(!str)
+		return;
+	memcpy(str, text, (size_t)len);
+	str[len] = '\0';
+
+	/* Not Implemented in SFML
+	sf::Clipboard clipboard(sfml.window);
+	clipboard.setText(str);
+	*/
+
+	free(str);
+}
+
+NK_API struct nk_context*
+nk_sfml_init(sf::Window* window)
+{
+	sfml.window = window;
+	nk_init_default(&sfml.ctx, 0);
+	sfml.ctx.clip.copy = nk_sfml_clipboard_copy;
+	sfml.ctx.clip.paste = nk_sfml_clipboard_paste;
+	sfml.ctx.clip.userdata = nk_handle_ptr(0);
+	//nk_buffer_init_default(&sfml.ogl.cmds);
+	nk_sfml_device_create();
+	return &sfml.ctx;
+}
+
+NK_API void
+nk_sfml_font_stash_begin(struct nk_font_atlas** atlas)
+{
+	nk_font_atlas_init_default(&sfml.atlas);
+	nk_font_atlas_begin(&sfml.atlas);
+	*atlas = &sfml.atlas;
+}
+
+NK_API void
+nk_sfml_font_stash_end(void)
+{
+	const void* image;
+	int w, h;
+	image = nk_font_atlas_bake(&sfml.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
+	nk_sfml_device_upload_atlas(image, w, h);
+	nk_font_atlas_end(&sfml.atlas, nk_handle_id((int)sfml.ogl.font_tex), &sfml.ogl.null);
+	if(sfml.atlas.default_font)
+		nk_style_set_font(&sfml.ctx, &sfml.atlas.default_font->handle);
+}
+
+NK_API int
+nk_sfml_handle_event(sf::Event* event)
+{
+	struct nk_context* ctx = &sfml.ctx;
+
+	/* optional grabbing behavior */
+	if(ctx->input.mouse.grab)
+	{
+		sfml.window->setMouseCursorGrabbed(true);
+		ctx->input.mouse.grab = 0;
+	}
+	else if(ctx->input.mouse.ungrab)
+	{
+		int x = (int)ctx->input.mouse.prev.x;
+		int y = (int)ctx->input.mouse.prev.y;
+		sfml.window->setMouseCursorGrabbed(false);
+		sf::Mouse::setPosition(sf::Vector2i(x, y));
+		ctx->input.mouse.ungrab = 0;
+	}
+
+	if(event->type == sf::Event::KeyReleased || event->type == sf::Event::KeyPressed)
+	{
+		int down = event->type == sf::Event::KeyPressed;
+		sf::Keyboard::Key key = event->key.code;
+
+		if(key == sf::Keyboard::RShift || key == sf::Keyboard::LShift)
+			nk_input_key(ctx, NK_KEY_SHIFT, down);
+		else if(key == sf::Keyboard::Delete)
+			nk_input_key(ctx, NK_KEY_DEL, down);
+		else if(key == sf::Keyboard::Return)
+			nk_input_key(ctx, NK_KEY_ENTER, down);
+		else if(key == sf::Keyboard::Tab)
+			nk_input_key(ctx, NK_KEY_TAB, down);
+		else if(key == sf::Keyboard::BackSpace)
+			nk_input_key(ctx, NK_KEY_BACKSPACE, down);
+		else if(key == sf::Keyboard::Home)
+		{
+			nk_input_key(ctx, NK_KEY_TEXT_START, down);
+			nk_input_key(ctx, NK_KEY_SCROLL_START, down);
+		}
+		else if(key == sf::Keyboard::End)
+		{
+			nk_input_key(ctx, NK_KEY_TEXT_END, down);
+			nk_input_key(ctx, NK_KEY_SCROLL_END, down);
+		}
+		else if(key == sf::Keyboard::PageDown)
+			nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
+		else if(key == sf::Keyboard::PageUp)
+			nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
+		else if(key == sf::Keyboard::Z)
+			nk_input_key(ctx, NK_KEY_TEXT_UNDO, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::R)
+			nk_input_key(ctx, NK_KEY_TEXT_REDO, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::C)
+			nk_input_key(ctx, NK_KEY_COPY, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::V)
+			nk_input_key(ctx, NK_KEY_PASTE, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::X)
+			nk_input_key(ctx, NK_KEY_CUT, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::B)
+			nk_input_key(ctx, NK_KEY_TEXT_LINE_START, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::E)
+			nk_input_key(ctx, NK_KEY_TEXT_LINE_END, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
+		else if(key == sf::Keyboard::Up)
+			nk_input_key(ctx, NK_KEY_UP, down);
+		else if(key == sf::Keyboard::Down)
+			nk_input_key(ctx, NK_KEY_DOWN, down);
+		else if(key == sf::Keyboard::Left)
+		{
+			if(sf::Keyboard::isKeyPressed(sf::Keyboard::LControl))
+				nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, down);
+			else
+				nk_input_key(ctx, NK_KEY_LEFT, down);
+		}
+		else if(key == sf::Keyboard::Right)
+		{
+			if(sf::Keyboard::isKeyPressed(sf::Keyboard::LControl))
+				nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, down);
+			else
+				nk_input_key(ctx, NK_KEY_RIGHT, down);
+		}
+		else return 0;
+
+		return 1;
+	}
+	else if(event->type == sf::Event::MouseButtonPressed || event->type == sf::Event::MouseButtonReleased)
+	{
+		int down = event->type == sf::Event::MouseButtonPressed;
+		const int x = event->mouseButton.x;
+		const int y = event->mouseButton.y;
+
+		if(event->mouseButton.button == sf::Mouse::Left)
+			nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
+		if(event->mouseButton.button == sf::Mouse::Middle)
+			nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down);
+		if(event->mouseButton.button == sf::Mouse::Right)
+			nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down);
+		else
+			return 0;
+
+		return 1;
+	}
+	else if(event->type == sf::Event::MouseMoved)
+	{
+		if(ctx->input.mouse.grabbed)
+		{
+			int x = (int)ctx->input.mouse.prev.x + event->mouseMove.x;
+			int y = (int)ctx->input.mouse.prev.y + event->mouseMove.y;
+
+			nk_input_motion(ctx, x, y);
+		}
+		else
+			nk_input_motion(ctx, event->mouseMove.x, event->mouseMove.y);
+
+		return 1;
+	}
+	/* For Android*/
+	else if(event->type == sf::Event::TouchBegan || event->type == sf::Event::TouchEnded)
+	{
+		int down = event->type == sf::Event::TouchBegan;
+		const int x = event->touch.x;
+		const int y = event->touch.y;
+
+		nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
+
+		return 1;
+	}
+	else if(event->type == sf::Event::TouchMoved)
+	{
+		if(ctx->input.mouse.grabbed)
+		{
+			int x = (int)ctx->input.mouse.prev.x;
+			int y = (int)ctx->input.mouse.prev.y;
+
+			nk_input_motion(ctx, x + event->touch.x, y + event->touch.y);
+		}
+		else
+			nk_input_motion(ctx, event->touch.x, event->touch.y);
+
+		return 1;
+	}
+	else if(event->type == sf::Event::TextEntered)
+	{
+		nk_input_unicode(ctx, event->text.unicode);
+
+		return 1;
+	}
+	else if(event->type == sf::Event::MouseWheelScrolled)
+	{
+		nk_input_scroll(ctx, event->mouseWheelScroll.delta);
+
+		return 1;
+	}
+
+	return 0;
+}
+
+NK_API
+void nk_sfml_shutdown(void)
+{
+	nk_font_atlas_clear(&sfml.atlas);
+	nk_free(&sfml.ctx);
+	nk_sfml_device_destroy();
+	memset(&sfml, 0, sizeof(sfml));
+}
+
+#endif