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Diffstat (limited to 'nuklear/demo/x11_opengl2/main.c')
| -rw-r--r-- | nuklear/demo/x11_opengl2/main.c | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/nuklear/demo/x11_opengl2/main.c b/nuklear/demo/x11_opengl2/main.c new file mode 100644 index 0000000..cfe5604 --- /dev/null +++ b/nuklear/demo/x11_opengl2/main.c @@ -0,0 +1,320 @@ +/* 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; + +} |