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diff --git a/nuklear/demo/x11_opengl2/main.c b/nuklear/demo/x11_opengl2/main.c
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+/* nuklear - v1.17 - 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 <time.h>
+#include <limits.h>
+
+#include <GL/glx.h>
+#include <GL/glxext.h>
+
+#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_XLIB_GL2_IMPLEMENTATION
+#include "../../nuklear.h"
+#include "nuklear_xlib_gl2.h"
+
+#define WINDOW_WIDTH 1200
+#define WINDOW_HEIGHT 800
+
+#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
+ *
+ * ===============================================================*/
+struct XWindow {
+ Display *dpy;
+ Window win;
+ XVisualInfo *vis;
+ Colormap cmap;
+ XSetWindowAttributes swa;
+ XWindowAttributes attr;
+ GLXFBConfig fbc;
+ int width, height;
+};
+static int gl_err = FALSE;
+static int gl_error_handler(Display *dpy, XErrorEvent *ev)
+{UNUSED((dpy, ev)); gl_err = TRUE;return 0;}
+
+static void
+die(const char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ fputs("\n", stderr);
+ exit(EXIT_FAILURE);
+}
+
+static int
+has_extension(const char *string, const char *ext)
+{
+ const char *start, *where, *term;
+ where = strchr(ext, ' ');
+ if (where || *ext == '\0')
+ return FALSE;
+
+ for (start = string;;) {
+ where = strstr((const char*)start, ext);
+ if (!where) break;
+ term = where + strlen(ext);
+ if (where == start || *(where - 1) == ' ') {
+ if (*term == ' ' || *term == '\0')
+ return TRUE;
+ }
+ start = term;
+ }
+ return FALSE;
+}
+
+int main(int argc, char **argv)
+{
+ /* Platform */
+ int running = 1;
+ struct XWindow win;
+ GLXContext glContext;
+ struct nk_context *ctx;
+ struct nk_color background;
+
+ memset(&win, 0, sizeof(win));
+ win.dpy = XOpenDisplay(NULL);
+ if (!win.dpy) die("Failed to open X display\n");
+ {
+ /* check glx version */
+ int glx_major, glx_minor;
+ if (!glXQueryVersion(win.dpy, &glx_major, &glx_minor))
+ die("[X11]: Error: Failed to query OpenGL version\n");
+ if ((glx_major == 1 && glx_minor < 3) || (glx_major < 1))
+ die("[X11]: Error: Invalid GLX version!\n");
+ }
+ {
+ /* find and pick matching framebuffer visual */
+ int fb_count;
+ static GLint attr[] = {
+ GLX_X_RENDERABLE, True,
+ GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
+ GLX_RENDER_TYPE, GLX_RGBA_BIT,
+ GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR,
+ GLX_RED_SIZE, 8,
+ GLX_GREEN_SIZE, 8,
+ GLX_BLUE_SIZE, 8,
+ GLX_ALPHA_SIZE, 8,
+ GLX_DEPTH_SIZE, 24,
+ GLX_STENCIL_SIZE, 8,
+ GLX_DOUBLEBUFFER, True,
+ None
+ };
+ GLXFBConfig *fbc;
+ fbc = glXChooseFBConfig(win.dpy, DefaultScreen(win.dpy), attr, &fb_count);
+ if (!fbc) die("[X11]: Error: failed to retrieve framebuffer configuration\n");
+ {
+ /* pick framebuffer with most samples per pixel */
+ int i;
+ int fb_best = -1, best_num_samples = -1;
+ for (i = 0; i < fb_count; ++i) {
+ XVisualInfo *vi = glXGetVisualFromFBConfig(win.dpy, fbc[i]);
+ if (vi) {
+ int sample_buffer, samples;
+ glXGetFBConfigAttrib(win.dpy, fbc[i], GLX_SAMPLE_BUFFERS, &sample_buffer);
+ glXGetFBConfigAttrib(win.dpy, fbc[i], GLX_SAMPLES, &samples);
+ if ((fb_best < 0) || (sample_buffer && samples > best_num_samples))
+ fb_best = i; best_num_samples = samples;
+ }
+ }
+ win.fbc = fbc[fb_best];
+ XFree(fbc);
+ win.vis = glXGetVisualFromFBConfig(win.dpy, win.fbc);
+ }
+ }
+ {
+ /* create window */
+ win.cmap = XCreateColormap(win.dpy, RootWindow(win.dpy, win.vis->screen), win.vis->visual, AllocNone);
+ win.swa.colormap = win.cmap;
+ win.swa.background_pixmap = None;
+ win.swa.border_pixel = 0;
+ win.swa.event_mask =
+ ExposureMask | KeyPressMask | KeyReleaseMask |
+ ButtonPress | ButtonReleaseMask| ButtonMotionMask |
+ Button1MotionMask | Button3MotionMask | Button4MotionMask | Button5MotionMask|
+ PointerMotionMask| StructureNotifyMask;
+ win.win = XCreateWindow(win.dpy, RootWindow(win.dpy, win.vis->screen), 0, 0,
+ WINDOW_WIDTH, WINDOW_HEIGHT, 0, win.vis->depth, InputOutput,
+ win.vis->visual, CWBorderPixel|CWColormap|CWEventMask, &win.swa);
+ if (!win.win) die("[X11]: Failed to create window\n");
+ XFree(win.vis);
+ XStoreName(win.dpy, win.win, "Demo");
+ XMapWindow(win.dpy, win.win);
+ }
+ {
+ /* create opengl context */
+ typedef GLXContext(*glxCreateContext)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
+ int(*old_handler)(Display*, XErrorEvent*) = XSetErrorHandler(gl_error_handler);
+ const char *extensions_str = glXQueryExtensionsString(win.dpy, DefaultScreen(win.dpy));
+ glxCreateContext create_context = (glxCreateContext)
+ glXGetProcAddressARB((const GLubyte*)"glXCreateContextAttribsARB");
+
+ gl_err = FALSE;
+ if (!has_extension(extensions_str, "GLX_ARB_create_context") || !create_context) {
+ fprintf(stdout, "[X11]: glXCreateContextAttribARB() not found...\n");
+ fprintf(stdout, "[X11]: ... using old-style GLX context\n");
+ glContext = glXCreateNewContext(win.dpy, win.fbc, GLX_RGBA_TYPE, 0, True);
+ } else {
+ GLint attr[] = {
+ GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
+ GLX_CONTEXT_MINOR_VERSION_ARB, 0,
+ None
+ };
+ glContext = create_context(win.dpy, win.fbc, 0, True, attr);
+ XSync(win.dpy, False);
+ if (gl_err || !glContext) {
+ /* Could not create GL 3.0 context. Fallback to old 2.x context.
+ * If a version below 3.0 is requested, implementations will
+ * return the newest context version compatible with OpenGL
+ * version less than version 3.0.*/
+ attr[1] = 1; attr[3] = 0;
+ gl_err = FALSE;
+ fprintf(stdout, "[X11] Failed to create OpenGL 3.0 context\n");
+ fprintf(stdout, "[X11] ... using old-style GLX context!\n");
+ glContext = create_context(win.dpy, win.fbc, 0, True, attr);
+ }
+ }
+ XSync(win.dpy, False);
+ XSetErrorHandler(old_handler);
+ if (gl_err || !glContext)
+ die("[X11]: Failed to create an OpenGL context\n");
+ glXMakeCurrent(win.dpy, win.win, glContext);
+ }
+
+ ctx = nk_x11_init(win.dpy, win.win);
+ /* 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_x11_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_x11_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 (running)
+ {
+ /* Input */
+ XEvent evt;
+ nk_input_begin(ctx);
+ while (XCheckWindowEvent(win.dpy, win.win, win.swa.event_mask, &evt)){
+ if (XFilterEvent(&evt, win.win)) continue;
+ nk_x11_handle_event(&evt);
+ }
+ nk_input_end(ctx);
+
+ /* GUI */
+ if (nk_begin(ctx, "Demo", nk_rect(50, 50, 200, 200),
+ NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
+ NK_WINDOW_CLOSABLE|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);
+ if (nk_window_is_closed(ctx, "Demo")) break;
+
+ /* -------------- EXAMPLES ---------------- */
+ /*calculator(ctx);*/
+ /*overview(ctx);*/
+ /*node_editor(ctx);*/
+ /* ----------------------------------------- */
+
+ /* Draw */
+ {float bg[4];
+ nk_color_fv(bg, background);
+ XGetWindowAttributes(win.dpy, win.win, &win.attr);
+ glViewport(0, 0, win.width, win.height);
+ glClear(GL_COLOR_BUFFER_BIT);
+ glClearColor(bg[0], bg[1], bg[2], bg[3]);
+ /* IMPORTANT: `nk_x11_render` modifies some global OpenGL state
+ * with blending, scissor, face culling, depth test and viewport and
+ * defaults everything back into a default state.
+ * Make sure to either a.) save and restore or b.) reset your own state after
+ * rendering the UI. */
+ nk_x11_render(NK_ANTI_ALIASING_ON, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
+ glXSwapBuffers(win.dpy, win.win);}
+ }
+
+ nk_x11_shutdown();
+ glXMakeCurrent(win.dpy, 0, 0);
+ glXDestroyContext(win.dpy, glContext);
+ XUnmapWindow(win.dpy, win.win);
+ XFreeColormap(win.dpy, win.cmap);
+ XDestroyWindow(win.dpy, win.win);
+ XCloseDisplay(win.dpy);
+ return 0;
+
+}