305 lines
11 KiB
C
305 lines
11 KiB
C
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/* nuklear - v1.00 - public domain */
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdarg.h>
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#include <string.h>
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#include <math.h>
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#include <assert.h>
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#include <math.h>
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#include <time.h>
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#include <limits.h>
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#include <GL/glx.h>
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#include <GL/glxext.h>
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#define NK_INCLUDE_FIXED_TYPES
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#define NK_INCLUDE_STANDARD_IO
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#define NK_INCLUDE_DEFAULT_ALLOCATOR
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#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
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#define NK_INCLUDE_FONT_BAKING
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#define NK_INCLUDE_DEFAULT_FONT
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#define NK_IMPLEMENTATION
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#define NK_XLIB_GL2_IMPLEMENTATION
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#include "../../nuklear.h"
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#include "nuklear_xlib_gl2.h"
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#define WINDOW_WIDTH 800
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#define WINDOW_HEIGHT 600
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#define MAX_VERTEX_BUFFER 512 * 1024
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#define MAX_ELEMENT_BUFFER 128 * 1024
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#define UNUSED(a) (void)a
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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#define MAX(a,b) ((a) < (b) ? (b) : (a))
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#define LEN(a) (sizeof(a)/sizeof(a)[0])
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/* ===============================================================
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*
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* EXAMPLE
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*
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* ===============================================================*/
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/* This are some code examples to provide a small overview of what can be
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* done with this library. To try out an example uncomment the include
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* and the corresponding function. */
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/*#include "../style.c"*/
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/*#include "../calculator.c"*/
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/*#include "../overview.c"*/
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/*#include "../node_editor.c"*/
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/* ===============================================================
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*
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* DEMO
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*
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* ===============================================================*/
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struct XWindow {
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Display *dpy;
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Window win;
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XVisualInfo *vis;
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Colormap cmap;
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XSetWindowAttributes swa;
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XWindowAttributes attr;
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GLXFBConfig fbc;
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int width, height;
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};
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static int gl_err = FALSE;
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static int gl_error_handler(Display *dpy, XErrorEvent *ev)
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{UNUSED((dpy, ev)); gl_err = TRUE;return 0;}
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static void
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die(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fputs("\n", stderr);
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exit(EXIT_FAILURE);
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}
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static int
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has_extension(const char *string, const char *ext)
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{
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const char *start, *where, *term;
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where = strchr(ext, ' ');
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if (where || *ext == '\0')
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return FALSE;
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for (start = string;;) {
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where = strstr((const char*)start, ext);
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if (!where) break;
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term = where + strlen(ext);
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if (where == start || *(where - 1) == ' ') {
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if (*term == ' ' || *term == '\0')
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return TRUE;
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}
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start = term;
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}
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return FALSE;
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}
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int main(int argc, char **argv)
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{
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/* Platform */
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int running = 1;
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struct XWindow win;
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GLXContext glContext;
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struct nk_context *ctx;
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struct nk_color background;
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memset(&win, 0, sizeof(win));
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win.dpy = XOpenDisplay(NULL);
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if (!win.dpy) die("Failed to open X display\n");
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{
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/* check glx version */
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int glx_major, glx_minor;
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if (!glXQueryVersion(win.dpy, &glx_major, &glx_minor))
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die("[X11]: Error: Failed to query OpenGL version\n");
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if ((glx_major == 1 && glx_minor < 3) || (glx_major < 1))
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die("[X11]: Error: Invalid GLX version!\n");
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}
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{
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/* find and pick matching framebuffer visual */
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int fb_count;
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static GLint attr[] = {
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GLX_X_RENDERABLE, True,
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GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
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GLX_RENDER_TYPE, GLX_RGBA_BIT,
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GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR,
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GLX_RED_SIZE, 8,
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GLX_GREEN_SIZE, 8,
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GLX_BLUE_SIZE, 8,
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GLX_ALPHA_SIZE, 8,
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GLX_DEPTH_SIZE, 24,
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GLX_STENCIL_SIZE, 8,
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GLX_DOUBLEBUFFER, True,
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None
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};
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GLXFBConfig *fbc;
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fbc = glXChooseFBConfig(win.dpy, DefaultScreen(win.dpy), attr, &fb_count);
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if (!fbc) die("[X11]: Error: failed to retrieve framebuffer configuration\n");
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{
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/* pick framebuffer with most samples per pixel */
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int i;
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int fb_best = -1, best_num_samples = -1;
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for (i = 0; i < fb_count; ++i) {
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XVisualInfo *vi = glXGetVisualFromFBConfig(win.dpy, fbc[i]);
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if (vi) {
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int sample_buffer, samples;
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glXGetFBConfigAttrib(win.dpy, fbc[i], GLX_SAMPLE_BUFFERS, &sample_buffer);
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glXGetFBConfigAttrib(win.dpy, fbc[i], GLX_SAMPLES, &samples);
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if ((fb_best < 0) || (sample_buffer && samples > best_num_samples))
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fb_best = i; best_num_samples = samples;
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}
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}
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win.fbc = fbc[fb_best];
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XFree(fbc);
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win.vis = glXGetVisualFromFBConfig(win.dpy, win.fbc);
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}
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}
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{
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/* create window */
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win.cmap = XCreateColormap(win.dpy, RootWindow(win.dpy, win.vis->screen), win.vis->visual, AllocNone);
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win.swa.colormap = win.cmap;
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win.swa.background_pixmap = None;
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win.swa.border_pixel = 0;
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win.swa.event_mask =
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ExposureMask | KeyPressMask | KeyReleaseMask |
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ButtonPress | ButtonReleaseMask| ButtonMotionMask |
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Button1MotionMask | Button3MotionMask | Button4MotionMask | Button5MotionMask|
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PointerMotionMask| StructureNotifyMask;
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win.win = XCreateWindow(win.dpy, RootWindow(win.dpy, win.vis->screen), 0, 0,
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WINDOW_WIDTH, WINDOW_HEIGHT, 0, win.vis->depth, InputOutput,
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win.vis->visual, CWBorderPixel|CWColormap|CWEventMask, &win.swa);
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if (!win.win) die("[X11]: Failed to create window\n");
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XFree(win.vis);
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XStoreName(win.dpy, win.win, "Demo");
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XMapWindow(win.dpy, win.win);
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}
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{
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/* create opengl context */
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typedef GLXContext(*glxCreateContext)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
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int(*old_handler)(Display*, XErrorEvent*) = XSetErrorHandler(gl_error_handler);
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const char *extensions_str = glXQueryExtensionsString(win.dpy, DefaultScreen(win.dpy));
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glxCreateContext create_context = (glxCreateContext)
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glXGetProcAddressARB((const GLubyte*)"glXCreateContextAttribsARB");
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gl_err = FALSE;
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if (!has_extension(extensions_str, "GLX_ARB_create_context") || !create_context) {
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fprintf(stdout, "[X11]: glXCreateContextAttribARB() not found...\n");
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fprintf(stdout, "[X11]: ... using old-style GLX context\n");
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glContext = glXCreateNewContext(win.dpy, win.fbc, GLX_RGBA_TYPE, 0, True);
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} else {
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GLint attr[] = {
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GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
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GLX_CONTEXT_MINOR_VERSION_ARB, 0,
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None
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};
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glContext = create_context(win.dpy, win.fbc, 0, True, attr);
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XSync(win.dpy, False);
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if (gl_err || !glContext) {
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/* Could not create GL 3.0 context. Fallback to old 2.x context.
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* If a version below 3.0 is requested, implementations will
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* return the newest context version compatible with OpenGL
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* version less than version 3.0.*/
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attr[1] = 1; attr[3] = 0;
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gl_err = FALSE;
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fprintf(stdout, "[X11] Failed to create OpenGL 3.0 context\n");
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fprintf(stdout, "[X11] ... using old-style GLX context!\n");
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glContext = create_context(win.dpy, win.fbc, 0, True, attr);
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}
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}
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XSync(win.dpy, False);
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XSetErrorHandler(old_handler);
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if (gl_err || !glContext)
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die("[X11]: Failed to create an OpenGL context\n");
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glXMakeCurrent(win.dpy, win.win, glContext);
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}
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ctx = nk_x11_init(win.dpy, win.win);
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/* Load Fonts: if none of these are loaded a default font will be used */
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{struct nk_font_atlas *atlas;
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nk_x11_font_stash_begin(&atlas);
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/*struct nk_font *droid = nk_font_atlas_add_from_file(atlas, "../../../extra_font/DroidSans.ttf", 14, 0);*/
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/*struct nk_font *roboto = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Roboto-Regular.ttf", 14, 0);*/
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/*struct nk_font *future = nk_font_atlas_add_from_file(atlas, "../../../extra_font/kenvector_future_thin.ttf", 13, 0);*/
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/*struct nk_font *clean = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyClean.ttf", 12, 0);*/
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/*struct nk_font *tiny = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyTiny.ttf", 10, 0);*/
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/*struct nk_font *cousine = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Cousine-Regular.ttf", 13, 0);*/
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nk_x11_font_stash_end();
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/*nk_style_set_font(ctx, &droid->handle);*/}
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/* style.c */
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/*set_style(ctx, THEME_WHITE);*/
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/*set_style(ctx, THEME_RED);*/
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/*set_style(ctx, THEME_BLUE);*/
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/*set_style(ctx, THEME_DARK);*/
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background = nk_rgb(28,48,62);
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while (running)
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{
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/* Input */
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XEvent evt;
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nk_input_begin(ctx);
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while (XCheckWindowEvent(win.dpy, win.win, win.swa.event_mask, &evt)){
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if (XFilterEvent(&evt, win.win)) continue;
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nk_x11_handle_event(&evt);
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}
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nk_input_end(ctx);
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/* GUI */
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{struct nk_panel layout;
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if (nk_begin(ctx, &layout, "Demo", nk_rect(50, 50, 200, 200),
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NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
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NK_WINDOW_CLOSABLE|NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
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{
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enum {EASY, HARD};
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static int op = EASY;
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static int property = 20;
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nk_layout_row_static(ctx, 30, 80, 1);
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if (nk_button_label(ctx, "button", NK_BUTTON_DEFAULT))
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fprintf(stdout, "button pressed\n");
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nk_layout_row_dynamic(ctx, 30, 2);
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if (nk_option_label(ctx, "easy", op == EASY)) op = EASY;
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if (nk_option_label(ctx, "hard", op == HARD)) op = HARD;
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nk_layout_row_dynamic(ctx, 25, 1);
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nk_property_int(ctx, "Compression:", 0, &property, 100, 10, 1);
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}
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nk_end(ctx);}
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if (nk_window_is_closed(ctx, "Demo")) break;
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/* -------------- EXAMPLES ---------------- */
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/*calculator(ctx);*/
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/*overview(ctx);*/
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/*node_editor(ctx);*/
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/* ----------------------------------------- */
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/* Draw */
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{float bg[4];
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nk_color_fv(bg, background);
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XGetWindowAttributes(win.dpy, win.win, &win.attr);
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glViewport(0, 0, win.width, win.height);
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glClear(GL_COLOR_BUFFER_BIT);
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glClearColor(bg[0], bg[1], bg[2], bg[3]);
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/* IMPORTANT: `nk_x11_render` modifies some global OpenGL state
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* with blending, scissor, face culling, depth test and viewport and
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* defaults everything back into a default state.
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* Make sure to either a.) save and restore or b.) reset your own state after
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* rendering the UI. */
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nk_x11_render(NK_ANTI_ALIASING_ON, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
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glXSwapBuffers(win.dpy, win.win);}
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}
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nk_x11_shutdown();
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glXMakeCurrent(win.dpy, 0, 0);
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glXDestroyContext(win.dpy, glContext);
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XUnmapWindow(win.dpy, win.win);
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XFreeColormap(win.dpy, win.cmap);
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XDestroyWindow(win.dpy, win.win);
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XCloseDisplay(win.dpy);
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return 0;
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}
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