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annotate spycam/src/main.cc @ 6:026156ea8801

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foo
author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 16 Mar 2016 00:00:06 +0200
parents a5755687dd75
children
rev   line source
nuclear@0 1 #include <stdio.h>
nuclear@0 2 #include <stdlib.h>
nuclear@0 3 #include <unistd.h>
nuclear@0 4 #include <sys/select.h>
nuclear@0 5 #include <X11/Xlib.h>
nuclear@1 6 #include <X11/Xutil.h>
nuclear@0 7 #include <X11/Xatom.h>
nuclear@0 8 #include <GLES2/gl2.h>
nuclear@0 9 #include <EGL/egl.h>
nuclear@0 10 #include "spycam.h"
nuclear@0 11
nuclear@0 12 static void cleanup();
nuclear@0 13 static bool create_glwin(int xsz, int ysz);
nuclear@0 14 static bool handle_event(XEvent *ev);
nuclear@0 15 static void set_window_title(const char *title);
nuclear@0 16
nuclear@0 17 static int win_width, win_height;
nuclear@0 18 static bool quit, redraw_pending;
nuclear@0 19 static Display *dpy;
nuclear@0 20 static Window win;
nuclear@0 21 static EGLDisplay egl_dpy;
nuclear@0 22 static EGLContext egl_ctx;
nuclear@0 23 static EGLSurface egl_win;
nuclear@0 24 static Atom xa_wm_proto, xa_del_window;
nuclear@0 25
nuclear@0 26 int main(int argc, char **argv)
nuclear@0 27 {
nuclear@0 28 if(!(dpy = XOpenDisplay(0))) {
nuclear@0 29 fprintf(stderr, "failed to connect to the X server.\n");
nuclear@0 30 return 1;
nuclear@0 31 }
nuclear@0 32 xa_wm_proto = XInternAtom(dpy, "WM_PROTOCOLS", False);
nuclear@0 33 xa_del_window = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
nuclear@0 34
nuclear@0 35 egl_dpy = eglGetDisplay(dpy);
nuclear@0 36 int egl_ver_major, egl_ver_minor;
nuclear@0 37 if(!eglInitialize(egl_dpy, &egl_ver_major, &egl_ver_minor)) {
nuclear@0 38 fprintf(stderr, "failed to initialize EGL\n");
nuclear@0 39 return 1;
nuclear@0 40 }
nuclear@0 41 printf("initialized EGL %d.%d\n", egl_ver_major, egl_ver_minor);
nuclear@0 42
nuclear@0 43 if(!create_glwin(800, 600)) {
nuclear@0 44 cleanup();
nuclear@0 45 return 1;
nuclear@0 46 }
nuclear@0 47
nuclear@0 48 if(!app_init()) {
nuclear@0 49 cleanup();
nuclear@0 50 return 1;
nuclear@0 51 }
nuclear@0 52
nuclear@0 53 for(;;) {
nuclear@0 54 while(XPending(dpy) || !redraw_pending) {
nuclear@0 55 XEvent ev;
nuclear@0 56 XNextEvent(dpy, &ev);
nuclear@0 57 if(!handle_event(&ev) || quit) {
nuclear@0 58 goto break_main_loop;
nuclear@0 59 }
nuclear@0 60 }
nuclear@0 61
nuclear@0 62 if(redraw_pending) {
nuclear@0 63 app_draw();
nuclear@0 64 eglSwapBuffers(egl_dpy, egl_win);
nuclear@0 65 }
nuclear@0 66 }
nuclear@0 67 break_main_loop:
nuclear@0 68
nuclear@0 69 cleanup();
nuclear@0 70 return 0;
nuclear@0 71 }
nuclear@0 72
nuclear@0 73 void app_quit()
nuclear@0 74 {
nuclear@0 75 quit = true;
nuclear@0 76 }
nuclear@0 77
nuclear@0 78 void app_redisplay()
nuclear@0 79 {
nuclear@0 80 redraw_pending = true;
nuclear@0 81 }
nuclear@0 82
nuclear@0 83 static void cleanup()
nuclear@0 84 {
nuclear@0 85 if(egl_dpy) {
nuclear@0 86 eglMakeCurrent(egl_dpy, 0, 0, 0);
nuclear@0 87 if(egl_win)
nuclear@0 88 eglDestroySurface(egl_dpy, egl_win);
nuclear@0 89 if(egl_ctx)
nuclear@0 90 eglDestroyContext(egl_dpy, egl_ctx);
nuclear@0 91 eglTerminate(egl_dpy);
nuclear@0 92 }
nuclear@0 93 if(dpy) {
nuclear@0 94 if(win)
nuclear@0 95 XDestroyWindow(dpy, win);
nuclear@0 96 XCloseDisplay(dpy);
nuclear@0 97 }
nuclear@0 98 }
nuclear@0 99
nuclear@0 100 static bool create_glwin(int xsz, int ysz)
nuclear@0 101 {
nuclear@0 102 static const int egl_attr[] = {
nuclear@0 103 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
nuclear@0 104 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
nuclear@0 105 EGL_RED_SIZE, 5,
nuclear@0 106 EGL_GREEN_SIZE, 5,
nuclear@0 107 EGL_BLUE_SIZE, 5,
nuclear@0 108 EGL_DEPTH_SIZE, 16,
nuclear@0 109 EGL_NONE
nuclear@0 110 };
nuclear@0 111
nuclear@0 112 int scr = DefaultScreen(dpy);
nuclear@0 113 Window root_win = RootWindow(dpy, scr);
nuclear@0 114
nuclear@0 115 EGLConfig cfg;
nuclear@0 116 int num_cfg;
nuclear@0 117 if(!eglChooseConfig(egl_dpy, egl_attr, &cfg, 1, &num_cfg)) {
nuclear@0 118 fprintf(stderr, "failed to find matching EGL visual\n");
nuclear@0 119 return false;
nuclear@0 120 }
nuclear@0 121 int rsize, gsize, bsize, zsize, ssize, vis_id;
nuclear@0 122 eglGetConfigAttrib(egl_dpy, cfg, EGL_RED_SIZE, &rsize);
nuclear@0 123 eglGetConfigAttrib(egl_dpy, cfg, EGL_GREEN_SIZE, &gsize);
nuclear@0 124 eglGetConfigAttrib(egl_dpy, cfg, EGL_BLUE_SIZE, &bsize);
nuclear@0 125 eglGetConfigAttrib(egl_dpy, cfg, EGL_DEPTH_SIZE, &zsize);
nuclear@0 126 eglGetConfigAttrib(egl_dpy, cfg, EGL_STENCIL_SIZE, &ssize);
nuclear@0 127 eglGetConfigAttrib(egl_dpy, cfg, EGL_NATIVE_VISUAL_ID, &vis_id);
nuclear@0 128 printf("got visual %d: %d bpp (%d%d%d), %d zbuffer, %d stencil\n", vis_id, rsize + gsize + bsize,
nuclear@0 129 rsize, gsize, bsize, zsize, ssize);
nuclear@0 130
nuclear@0 131 int num_vis;
nuclear@0 132 XVisualInfo *vis_info, vis_template;
nuclear@0 133 vis_template.visualid = vis_id;
nuclear@0 134 if(!(vis_info = XGetVisualInfo(dpy, VisualIDMask, &vis_template, &num_vis))) {
nuclear@0 135 fprintf(stderr, "visual id %d is invalid (?!)\n", vis_id);
nuclear@0 136 return false;
nuclear@0 137 }
nuclear@0 138
nuclear@0 139 XSetWindowAttributes xattr;
nuclear@0 140 xattr.border_pixel = xattr.backing_pixel = BlackPixel(dpy, scr);
nuclear@0 141 xattr.colormap = XCreateColormap(dpy, root_win, vis_info->visual, AllocNone);
nuclear@0 142 unsigned int xattr_mask = CWColormap | CWBorderPixel | CWBackPixel;
nuclear@0 143
nuclear@0 144 win = XCreateWindow(dpy, root_win, 0, 0, xsz, ysz, 0, vis_info->depth, InputOutput,
nuclear@0 145 vis_info->visual, xattr_mask, &xattr);
nuclear@0 146 if(!win) {
nuclear@0 147 fprintf(stderr, "failed to create window\n");
nuclear@0 148 XFree(vis_info);
nuclear@0 149 return false;
nuclear@0 150 }
nuclear@0 151 XFree(vis_info);
nuclear@0 152 XSelectInput(dpy, win, ExposureMask | StructureNotifyMask | KeyPressMask | KeyReleaseMask);
nuclear@0 153
nuclear@0 154 XSetWMProtocols(dpy, win, &xa_del_window, 1);
nuclear@0 155 set_window_title("spycam");
nuclear@0 156
nuclear@0 157 eglBindAPI(EGL_OPENGL_ES_API);
nuclear@0 158
nuclear@0 159 if(!(egl_win = eglCreateWindowSurface(egl_dpy, cfg, win, 0))) {
nuclear@0 160 fprintf(stderr, "failed to create EGL window\n");
nuclear@0 161 XDestroyWindow(dpy, win);
nuclear@0 162 return false;
nuclear@0 163 }
nuclear@0 164
nuclear@0 165 static const int ctxattr[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
nuclear@0 166 if(!(egl_ctx = eglCreateContext(egl_dpy, cfg, EGL_NO_CONTEXT, ctxattr))) {
nuclear@0 167 fprintf(stderr, "failed to create EGL context\n");
nuclear@0 168 eglDestroySurface(egl_dpy, egl_win);
nuclear@0 169 XDestroyWindow(dpy, win);
nuclear@0 170 return false;
nuclear@0 171 }
nuclear@0 172 eglMakeCurrent(egl_dpy, egl_win, egl_win, egl_ctx);
nuclear@0 173
nuclear@0 174 XMapWindow(dpy, win);
nuclear@0 175
nuclear@0 176 eglQuerySurface(dpy, egl_win, EGL_WIDTH, &win_width);
nuclear@0 177 eglQuerySurface(dpy, egl_win, EGL_HEIGHT, &win_height);
nuclear@0 178 app_reshape(win_width, win_height);
nuclear@0 179
nuclear@0 180 return true;
nuclear@0 181 }
nuclear@0 182
nuclear@0 183 static bool handle_event(XEvent *ev)
nuclear@0 184 {
nuclear@0 185 static bool mapped;
nuclear@0 186
nuclear@0 187 switch(ev->type) {
nuclear@0 188 case Expose:
nuclear@0 189 if(mapped) {
nuclear@0 190 redraw_pending = true;
nuclear@0 191 }
nuclear@0 192 break;
nuclear@0 193
nuclear@0 194 case MapNotify:
nuclear@0 195 mapped = true;
nuclear@0 196 redraw_pending = true;
nuclear@0 197 break;
nuclear@0 198
nuclear@0 199 case UnmapNotify:
nuclear@0 200 mapped = false;
nuclear@0 201 redraw_pending = false;
nuclear@0 202 break;
nuclear@0 203
nuclear@0 204 case ConfigureNotify:
nuclear@0 205 if(win_width != (int)ev->xconfigure.width || win_height != (int)ev->xconfigure.height) {
nuclear@0 206 win_width = ev->xconfigure.width;
nuclear@0 207 win_height = ev->xconfigure.height;
nuclear@0 208 app_reshape(win_width, win_height);
nuclear@0 209 }
nuclear@0 210 break;
nuclear@0 211
nuclear@0 212 case KeyPress:
nuclear@0 213 case KeyRelease:
nuclear@0 214 app_keyboard(XLookupKeysym(&ev->xkey, 0) & 0xff, ev->type == KeyPress);
nuclear@0 215 break;
nuclear@0 216
nuclear@0 217 case ClientMessage:
nuclear@0 218 if(ev->xclient.message_type == xa_wm_proto &&
nuclear@0 219 (Atom)ev->xclient.data.l[0] == xa_del_window) {
nuclear@0 220 return false;
nuclear@0 221 }
nuclear@0 222 break;
nuclear@0 223
nuclear@0 224 default:
nuclear@0 225 break;
nuclear@0 226 }
nuclear@0 227 return true;
nuclear@0 228 }
nuclear@0 229
nuclear@0 230 static void set_window_title(const char *title)
nuclear@0 231 {
nuclear@0 232 XTextProperty text_prop;
nuclear@0 233 XStringListToTextProperty((char**)&title, 1, &text_prop);
nuclear@0 234 XSetWMName(dpy, win, &text_prop);
nuclear@0 235 XSetWMIconName(dpy, win, &text_prop);
nuclear@0 236 XFree(text_prop.value);
nuclear@0 237 }